Shareholder Report |
12 Months Ended | 21 Months Ended | 60 Months Ended | 81 Months Ended | 91 Months Ended | |||||||||||||||
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Mar. 31, 2026
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Mar. 31, 2026
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Mar. 31, 2026
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| Shareholder Report [Line Items] | ||||||||||||||||||||
| Document Type | N-CSR | |||||||||||||||||||
| Amendment Flag | false | |||||||||||||||||||
| Registrant Name | Fidelity Aberdeen Street Trust | |||||||||||||||||||
| Entity Central Index Key | 0000880195 | |||||||||||||||||||
| Entity Investment Company Type | N-1A | |||||||||||||||||||
| Document Period End Date | Mar. 31, 2026 | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2065 Fund - Class C | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2065 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2065 Fund Class C | |||||||||||||||||||
| Trading Symbol | FAXDX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2065 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
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| Expenses Paid, Amount | $ 163 | |||||||||||||||||||
| Expense Ratio, Percent | 1.47% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
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| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE June 28, 2019 through March 31, 2026. Initial investment of $10,000. Class C $10,000 $8,606 $13,272 $13,566 $12,487 $14,948 $15,590 $18,807 Fidelity Freedom 2065 Composite Index℠ $10,000 $8,783 $13,174 $13,882 $12,862 $15,453 $16,465 $19,597 S&P 500® Index $10,000 $8,918 $13,944 $16,126 $14,879 $19,326 $20,920 $24,645 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class C (incl. contingent deferred sales charge) 19.64% 7.22% 9.81% Class C 20.64% 7.22% 9.81% Fidelity Freedom 2065 Composite Index℠ 19.02% 8.27% 10.48% S&P 500® Index 17.80% 12.06% 14.30% A From June 28, 2019 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Jun. 28, 2019 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 560,851,778 | $ 560,851,778 | $ 560,851,778 | $ 560,851,778 | $ 560,851,778 | |||||||||||||||
| Holdings Count | shares | 42 | 42 | 42 | 42 | 42 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 1,336,669 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 16.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
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| Holdings [Text Block] | Domestic Equity Funds 55.9 International Equity Funds 41.4 Bond Funds 2.3 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 55.9 International Equity Funds - 41.4 Bond Funds - 2.3 Short-Term Investments and Net Other Assets (Liabilities) - 0.4 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 15.6 Fidelity Series Blue Chip Growth Fund 13.1 Fidelity Series Emerging Markets Opportunities Fund 10.6 Fidelity Series Large Cap Growth Index Fund 8.3 Fidelity Series Large Cap Stock Fund 8.2 Fidelity Series International Value Fund 6.8 Fidelity Series Overseas Fund 6.8 Fidelity Series International Growth Fund 6.8 Fidelity Series Value Discovery Fund 5.6 Fidelity Series Canada Fund 4.1 85.9 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
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| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period.
The fund's contractual proxy and shareholder meeting expense cap expired during the reporting period.
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| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
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| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2020 Fund - Class A | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2020 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2020 Fund Class A | |||||||||||||||||||
| Trading Symbol | FJAOX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2020 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
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| Expenses Paid, Amount | $ 72 | |||||||||||||||||||
| Expense Ratio, Percent | 0.68% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
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| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000 and the current sales charge was paid. Class A $9,425 $9,476 $9,130 $11,894 $11,917 $11,092 $12,245 $12,847 $14,422 Fidelity Freedom 2020 Composite Index℠ $10,000 $10,073 $9,915 $12,584 $12,802 $11,972 $13,254 $14,017 $15,570 Bloomberg U.S. Aggregate Bond Index $10,000 $10,395 $11,324 $11,404 $10,931 $10,408 $10,585 $11,101 $11,584 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class A (incl. 5.75% sales charge) 5.81% 2.71% 4.95% Class A (without 5.75% sales charge) 12.26% 3.93% 5.77% Fidelity Freedom 2020 Composite Index℠ 11.08% 4.35% 6.01% Bloomberg U.S. Aggregate Bond Index 4.35% 0.31% 1.96% A From August 31, 2018 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 1,276,372,296 | $ 1,276,372,296 | $ 1,276,372,296 | $ 1,276,372,296 | $ 1,276,372,296 | |||||||||||||||
| Holdings Count | shares | 49 | 49 | 49 | 49 | 49 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 3,260,714 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 30.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
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| Holdings [Text Block] | Bond Funds 49.2 Domestic Equity Funds 26.6 International Equity Funds 21.8 Short-Term Funds 2.1 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) Bond Funds - 49.2 Domestic Equity Funds - 26.6 International Equity Funds - 21.8 Short-Term Funds - 2.1 Short-Term Investments and Net Other Assets (Liabilities) - 0.3 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Government Bond Index Fund 9.0 Fidelity Series Investment Grade Bond Fund 8.3 Fidelity Series Large Cap Value Index Fund 7.1 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 6.5 Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 6.2 Fidelity Series Blue Chip Growth Fund 6.0 Fidelity Series Emerging Markets Opportunities Fund 5.7 Fidelity Series Corporate Bond Fund 5.4 Fidelity Series Investment Grade Securitized Fund 5.1 Fidelity Series International Developed Markets Bond Index Fund 4.8 64.1 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
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| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2060 Fund - Class M | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2060 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2060 Fund Class M | |||||||||||||||||||
| Trading Symbol | FHMEX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2060 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
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| Expenses Paid, Amount | $ 108 | |||||||||||||||||||
| Expense Ratio, Percent | 0.97% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
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| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000 and the current sales charge was paid. Class M $9,650 $9,496 $8,471 $13,135 $13,502 $12,482 $15,021 $15,747 $19,101 Fidelity Freedom 2060 Composite Index℠ $10,000 $9,871 $9,004 $13,506 $14,232 $13,186 $15,842 $16,880 $20,091 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class M (incl. 3.50% sales charge) 17.06% 7.01% 8.91% Class M (without 3.50% sales charge) 21.30% 7.78% 9.42% Fidelity Freedom 2060 Composite Index℠ 19.02% 8.27% 9.64% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 1,461,323,638 | $ 1,461,323,638 | $ 1,461,323,638 | $ 1,461,323,638 | $ 1,461,323,638 | |||||||||||||||
| Holdings Count | shares | 42 | 42 | 42 | 42 | 42 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 3,610,611 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 15.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
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| Holdings [Text Block] | Domestic Equity Funds 55.9 International Equity Funds 41.4 Bond Funds 2.3 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 55.9 International Equity Funds - 41.4 Bond Funds - 2.3 Short-Term Investments and Net Other Assets (Liabilities) - 0.4 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 15.5 Fidelity Series Blue Chip Growth Fund 13.1 Fidelity Series Emerging Markets Opportunities Fund 10.6 Fidelity Series Large Cap Growth Index Fund 8.3 Fidelity Series Large Cap Stock Fund 8.2 Fidelity Series International Value Fund 6.8 Fidelity Series Overseas Fund 6.8 Fidelity Series International Growth Fund 6.8 Fidelity Series Value Discovery Fund 5.5 Fidelity Series Canada Fund 4.1 85.7 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
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| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period.
The fund's contractual proxy and shareholder meeting expense cap expired during the reporting period.
|
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| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
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| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2015 Fund - Class Z | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2015 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2015 Fund Class Z | |||||||||||||||||||
| Trading Symbol | FJAPX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2015 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
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| Expenses Paid, Amount | $ 34 | |||||||||||||||||||
| Expense Ratio, Percent | 0.32% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
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| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Class Z $10,000 $10,107 $9,906 $12,452 $12,469 $11,736 $12,795 $13,465 $14,949 Fidelity Freedom 2015 Composite Index℠ $10,000 $10,107 $10,092 $12,336 $12,479 $11,773 $12,850 $13,583 $14,886 Bloomberg U.S. Aggregate Bond Index $10,000 $10,395 $11,324 $11,404 $10,931 $10,408 $10,585 $11,101 $11,584 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class Z 11.02% 3.72% 5.44% Fidelity Freedom 2015 Composite Index℠ 9.59% 3.83% 5.39% Bloomberg U.S. Aggregate Bond Index 4.35% 0.31% 1.96% A From August 31, 2018 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 332,449,887 | $ 332,449,887 | $ 332,449,887 | $ 332,449,887 | $ 332,449,887 | |||||||||||||||
| Holdings Count | shares | 45 | 45 | 45 | 45 | 45 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 950,396 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 25.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Bond Funds 54.3 Domestic Equity Funds 22.1 International Equity Funds 18.6 Short-Term Funds 4.7 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) Bond Funds - 54.3 Domestic Equity Funds - 22.1 International Equity Funds - 18.6 Short-Term Funds - 4.7 Short-Term Investments and Net Other Assets (Liabilities) - 0.3 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 11.7 Fidelity Series Government Bond Index Fund 9.8 Fidelity Series Investment Grade Bond Fund 9.1 Fidelity Series Corporate Bond Fund 5.9 Fidelity Series Large Cap Value Index Fund 5.8 Fidelity Series Investment Grade Securitized Fund 5.5 Fidelity Series Blue Chip Growth Fund 4.9 Fidelity Series Emerging Markets Opportunities Fund 4.9 Fidelity Series International Developed Markets Bond Index Fund 4.8 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 3.9 66.3 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
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| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Freedom Blend 2025 Fund | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2025 Fund | |||||||||||||||||||
| Class Name | Fidelity Freedom® Blend 2025 Fund | |||||||||||||||||||
| Trading Symbol | FHAUX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2025 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-544-8544 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 47 | |||||||||||||||||||
| Expense Ratio, Percent | 0.44% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Fidelity Freedom® Blend 2025 Fund $10,000 $10,042 $9,595 $12,928 $13,030 $12,141 $13,615 $14,307 $16,318 Fidelity Freedom 2025 Composite Index℠ $10,000 $10,043 $9,773 $12,764 $13,051 $12,167 $13,642 $14,434 $16,215 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Fidelity Freedom® Blend 2025 Fund 14.05% 4.77% 6.67% Fidelity Freedom 2025 Composite Index℠ 12.34% 4.90% 6.58% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit www.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 2,514,301,835 | $ 2,514,301,835 | $ 2,514,301,835 | $ 2,514,301,835 | $ 2,514,301,835 | |||||||||||||||
| Holdings Count | shares | 47 | 47 | 47 | 47 | 47 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 6,931,716 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 27.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
|||||||||||||||||||
| Holdings [Text Block] | Bond Funds 43.4 Domestic Equity Funds 31.1 International Equity Funds 25.2 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) Bond Funds - 43.4 Domestic Equity Funds - 31.1 International Equity Funds - 25.2 Short-Term Investments and Net Other Assets (Liabilities) - 0.3 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 8.9 Fidelity Series Large Cap Value Index Fund 8.6 Fidelity Series Government Bond Index Fund 7.8 Fidelity Series Investment Grade Bond Fund 7.2 Fidelity Series Blue Chip Growth Fund 7.2 Fidelity Series Emerging Markets Opportunities Fund 6.5 Fidelity Series International Developed Markets Bond Index Fund 4.8 Fidelity Series Corporate Bond Fund 4.7 Fidelity Series Large Cap Growth Index Fund 4.6 Fidelity Series Large Cap Stock Fund 4.5 64.8 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
|||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-8544</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2050 Fund - Class I | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2050 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2050 Fund Class I | |||||||||||||||||||
| Trading Symbol | FHWEX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2050 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 53 | |||||||||||||||||||
| Expense Ratio, Percent | 0.47% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Class I $10,000 $9,868 $8,850 $13,789 $14,240 $13,234 $16,008 $16,866 $20,555 Fidelity Freedom 2050 Composite Index℠ $10,000 $9,871 $9,004 $13,506 $14,232 $13,186 $15,842 $16,880 $20,099 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class I 21.88% 8.31% 9.97% Fidelity Freedom 2050 Composite Index℠ 19.07% 8.27% 9.64% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 3,689,428,934 | $ 3,689,428,934 | $ 3,689,428,934 | $ 3,689,428,934 | $ 3,689,428,934 | |||||||||||||||
| Holdings Count | shares | 41 | 41 | 41 | 41 | 41 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 9,358,090 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 16.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Domestic Equity Funds 55.0 International Equity Funds 40.8 Bond Funds 3.9 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 55.0 International Equity Funds - 40.8 Bond Funds - 3.9 Short-Term Investments and Net Other Assets (Liabilities) - 0.3 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 15.3 Fidelity Series Blue Chip Growth Fund 12.9 Fidelity Series Emerging Markets Opportunities Fund 10.4 Fidelity Series Large Cap Growth Index Fund 8.2 Fidelity Series Large Cap Stock Fund 8.0 Fidelity Series Overseas Fund 6.7 Fidelity Series International Value Fund 6.7 Fidelity Series International Growth Fund 6.7 Fidelity Series Value Discovery Fund 5.4 Fidelity Series Canada Fund 4.0 84.3 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
|||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2065 Fund - Class A | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2065 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2065 Fund Class A | |||||||||||||||||||
| Trading Symbol | FAZAX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2065 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 80 | |||||||||||||||||||
| Expense Ratio, Percent | 0.72% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
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| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE June 28, 2019 through March 31, 2026. Initial investment of $10,000 and the current sales charge was paid. Class A $9,425 $8,155 $12,668 $13,061 $12,103 $14,600 $15,347 $18,643 Fidelity Freedom 2065 Composite Index℠ $10,000 $8,783 $13,174 $13,882 $12,862 $15,453 $16,465 $19,597 S&P 500® Index $10,000 $8,918 $13,944 $16,126 $14,879 $19,326 $20,920 $24,645 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class A (incl. 5.75% sales charge) 14.49% 6.76% 9.67% Class A (without 5.75% sales charge) 21.48% 8.04% 10.63% Fidelity Freedom 2065 Composite Index℠ 19.02% 8.27% 10.48% S&P 500® Index 17.80% 12.06% 14.30% A From June 28, 2019 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Jun. 28, 2019 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 560,851,778 | $ 560,851,778 | $ 560,851,778 | $ 560,851,778 | $ 560,851,778 | |||||||||||||||
| Holdings Count | shares | 42 | 42 | 42 | 42 | 42 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 1,336,669 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 16.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Domestic Equity Funds 55.9 International Equity Funds 41.4 Bond Funds 2.3 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 55.9 International Equity Funds - 41.4 Bond Funds - 2.3 Short-Term Investments and Net Other Assets (Liabilities) - 0.4 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 15.6 Fidelity Series Blue Chip Growth Fund 13.1 Fidelity Series Emerging Markets Opportunities Fund 10.6 Fidelity Series Large Cap Growth Index Fund 8.3 Fidelity Series Large Cap Stock Fund 8.2 Fidelity Series International Value Fund 6.8 Fidelity Series Overseas Fund 6.8 Fidelity Series International Growth Fund 6.8 Fidelity Series Value Discovery Fund 5.6 Fidelity Series Canada Fund 4.1 85.9 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
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| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period.
The fund's contractual proxy and shareholder meeting expense cap expired during the reporting period.
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| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
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| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2020 Fund - Class C | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2020 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2020 Fund Class C | |||||||||||||||||||
| Trading Symbol | FJALX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2020 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
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| Expenses Paid, Amount | $ 151 | |||||||||||||||||||
| Expense Ratio, Percent | 1.43% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
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| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Class C $10,000 $10,008 $9,566 $12,377 $12,307 $11,377 $12,459 $12,972 $14,446 Fidelity Freedom 2020 Composite Index℠ $10,000 $10,073 $9,915 $12,584 $12,802 $11,972 $13,254 $14,017 $15,570 Bloomberg U.S. Aggregate Bond Index $10,000 $10,395 $11,324 $11,404 $10,931 $10,408 $10,585 $11,101 $11,584 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class C (incl. contingent deferred sales charge) 10.36% 3.14% 4.97% Class C 11.36% 3.14% 4.97% Fidelity Freedom 2020 Composite Index℠ 11.08% 4.35% 6.01% Bloomberg U.S. Aggregate Bond Index 4.35% 0.31% 1.96% A From August 31, 2018 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 1,276,372,296 | $ 1,276,372,296 | $ 1,276,372,296 | $ 1,276,372,296 | $ 1,276,372,296 | |||||||||||||||
| Holdings Count | shares | 49 | 49 | 49 | 49 | 49 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 3,260,714 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 30.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Bond Funds 49.2 Domestic Equity Funds 26.6 International Equity Funds 21.8 Short-Term Funds 2.1 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) Bond Funds - 49.2 Domestic Equity Funds - 26.6 International Equity Funds - 21.8 Short-Term Funds - 2.1 Short-Term Investments and Net Other Assets (Liabilities) - 0.3 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Government Bond Index Fund 9.0 Fidelity Series Investment Grade Bond Fund 8.3 Fidelity Series Large Cap Value Index Fund 7.1 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 6.5 Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 6.2 Fidelity Series Blue Chip Growth Fund 6.0 Fidelity Series Emerging Markets Opportunities Fund 5.7 Fidelity Series Corporate Bond Fund 5.4 Fidelity Series Investment Grade Securitized Fund 5.1 Fidelity Series International Developed Markets Bond Index Fund 4.8 64.1 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
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| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2070 Fund - Class A | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2070 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2070 Fund Class A | |||||||||||||||||||
| Trading Symbol | FRCHX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2070 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 80 | |||||||||||||||||||
| Expense Ratio, Percent | 0.72% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE June 28, 2024 through March 31, 2026. Initial investment of $10,000 and the current sales charge was paid. Class A $9,425 $9,734 $11,787 Fidelity Freedom 2070 Composite Index℠ $10,000 $10,441 $12,428 S&P 500® Index $10,000 $10,380 $12,229 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year Life of Fund A Class A (incl. 5.75% sales charge) 14.13% 9.85% Class A (without 5.75% sales charge) 21.09% 13.63% Fidelity Freedom 2070 Composite Index℠ 19.02% 13.22% S&P 500® Index 17.80% 12.18% A From June 28, 2024 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Jun. 28, 2024 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 47,210,850 | $ 47,210,850 | $ 47,210,850 | $ 47,210,850 | $ 47,210,850 | |||||||||||||||
| Holdings Count | shares | 22 | 22 | 22 | 22 | 22 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 75,991 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 28.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Domestic Equity Funds 53.0 International Equity Funds 42.3 Bond Funds 4.6 Short-Term Investments and Net Other Assets (Liabilities) 0.1 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 53.0 International Equity Funds - 42.3 Bond Funds - 4.6 Short-Term Investments and Net Other Assets (Liabilities) - 0.1 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 14.8 Fidelity Series Blue Chip Growth Fund 12.5 Fidelity Series Emerging Markets Opportunities Fund 10.7 Fidelity Series Large Cap Growth Index Fund 8.0 Fidelity Series Large Cap Stock Fund 7.8 Fidelity Series International Value Fund 7.1 Fidelity Series Overseas Fund 7.1 Fidelity Series International Growth Fund 7.1 Fidelity Series Value Discovery Fund 5.4 Fidelity Series Long-Term Treasury Bond Index Fund 4.6 85.1 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
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| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
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| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2035 Fund - Class M | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2035 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2035 Fund Class M | |||||||||||||||||||
| Trading Symbol | FHBCX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2035 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 105 | |||||||||||||||||||
| Expense Ratio, Percent | 0.97% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000 and the current sales charge was paid. Class M $9,650 $9,525 $8,662 $12,899 $13,157 $12,169 $14,149 $14,820 $17,272 Fidelity Freedom 2035 Composite Index℠ $10,000 $9,897 $9,181 $13,259 $13,817 $12,836 $14,933 $15,853 $18,246 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class M (incl. 3.50% sales charge) 12.46% 5.26% 7.47% Class M (without 3.50% sales charge) 16.54% 6.01% 7.98% Fidelity Freedom 2035 Composite Index℠ 15.09% 6.59% 8.25% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 4,774,644,697 | $ 4,774,644,697 | $ 4,774,644,697 | $ 4,774,644,697 | $ 4,774,644,697 | |||||||||||||||
| Holdings Count | shares | 48 | 48 | 48 | 48 | 48 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 12,522,295 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 18.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Domestic Equity Funds 39.8 International Equity Funds 30.9 Bond Funds 28.9 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 39.8 International Equity Funds - 30.9 Bond Funds - 28.9 Short-Term Investments and Net Other Assets (Liabilities) - 0.4 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 11.0 Fidelity Series Blue Chip Growth Fund 9.2 Fidelity Series Emerging Markets Opportunities Fund 7.9 Fidelity Series Large Cap Growth Index Fund 5.9 Fidelity Series Large Cap Stock Fund 5.8 Fidelity Series Government Bond Index Fund 5.4 Fidelity Series Investment Grade Bond Fund 5.2 Fidelity Series Overseas Fund 5.0 Fidelity Series International Value Fund 5.0 Fidelity Series International Growth Fund 5.0 65.4 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
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| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Freedom Blend 2015 Fund - Class K6 | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2015 Fund | |||||||||||||||||||
| Class Name | Fidelity Freedom® Blend 2015 Fund Class K6 | |||||||||||||||||||
| Trading Symbol | FHODX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2015 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-835-5092 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
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| Expenses Paid, Amount | $ 23 | |||||||||||||||||||
| Expense Ratio, Percent | 0.22% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Class K6 $10,000 $10,112 $9,924 $12,475 $12,510 $11,786 $12,868 $13,566 $15,061 Fidelity Freedom 2015 Composite Index℠ $10,000 $10,107 $10,092 $12,336 $12,479 $11,773 $12,850 $13,583 $14,886 Bloomberg U.S. Aggregate Bond Index $10,000 $10,395 $11,324 $11,404 $10,931 $10,408 $10,585 $11,101 $11,584 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class K6 11.02% 3.84% 5.55% Fidelity Freedom 2015 Composite Index℠ 9.59% 3.83% 5.39% Bloomberg U.S. Aggregate Bond Index 4.35% 0.31% 1.96% A From August 31, 2018 Visit www.401k.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.401k.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 332,449,887 | $ 332,449,887 | $ 332,449,887 | $ 332,449,887 | $ 332,449,887 | |||||||||||||||
| Holdings Count | shares | 45 | 45 | 45 | 45 | 45 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 950,396 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 25.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
|||||||||||||||||||
| Holdings [Text Block] | Bond Funds 54.3 Domestic Equity Funds 22.1 International Equity Funds 18.6 Short-Term Funds 4.7 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) Bond Funds - 54.3 Domestic Equity Funds - 22.1 International Equity Funds - 18.6 Short-Term Funds - 4.7 Short-Term Investments and Net Other Assets (Liabilities) - 0.3 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 11.7 Fidelity Series Government Bond Index Fund 9.8 Fidelity Series Investment Grade Bond Fund 9.1 Fidelity Series Corporate Bond Fund 5.9 Fidelity Series Large Cap Value Index Fund 5.8 Fidelity Series Investment Grade Securitized Fund 5.5 Fidelity Series Blue Chip Growth Fund 4.9 Fidelity Series Emerging Markets Opportunities Fund 4.9 Fidelity Series International Developed Markets Bond Index Fund 4.8 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 3.9 66.3 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
|||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period.
Effective June 1, 2025, the fund's expense contract was amended to reduce its total expenses.
|
|||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-835-5092</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Freedom Blend Retirement Fund - Class C | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend Retirement Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend Retirement Fund Class C | |||||||||||||||||||
| Trading Symbol | FHAKX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend Retirement Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 146 | |||||||||||||||||||
| Expense Ratio, Percent | 1.41% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Class C $10,000 $10,145 $10,232 $11,368 $11,136 $10,548 $11,019 $11,478 $12,288 Fidelity Freedom Retirement Composite Index℠ $10,000 $10,223 $10,623 $11,687 $11,652 $11,208 $11,896 $12,555 $13,448 Bloomberg U.S. Aggregate Bond Index $10,000 $10,395 $11,324 $11,404 $10,931 $10,408 $10,585 $11,101 $11,584 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class C (incl. contingent deferred sales charge) 6.05% 1.57% 2.75% Class C 7.05% 1.57% 2.75% Fidelity Freedom Retirement Composite Index℠ 7.11% 2.85% 3.98% Bloomberg U.S. Aggregate Bond Index 4.35% 0.31% 1.96% A From August 31, 2018 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 217,536,466 | $ 217,536,466 | $ 217,536,466 | $ 217,536,466 | $ 217,536,466 | |||||||||||||||
| Holdings Count | shares | 47 | 47 | 47 | 47 | 47 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 491,972 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 38.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
|||||||||||||||||||
| Holdings [Text Block] | Bond Funds 61.3 Domestic Equity Funds 16.3 International Equity Funds 14.7 Short-Term Funds 7.4 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) Bond Funds - 61.3 Domestic Equity Funds - 16.3 International Equity Funds - 14.7 Short-Term Funds - 7.4 Short-Term Investments and Net Other Assets (Liabilities) - 0.3 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 20.4 Fidelity Series Government Bond Index Fund 10.7 Fidelity Series Investment Grade Bond Fund 9.9 Fidelity Series Corporate Bond Fund 6.4 Fidelity Series Investment Grade Securitized Fund 6.0 Fidelity Series International Developed Markets Bond Index Fund 4.8 Fidelity Series Treasury Bill Index Fund 4.3 Fidelity Series Large Cap Value Index Fund 4.1 Fidelity Series Emerging Markets Opportunities Fund 3.9 Fidelity Series Blue Chip Growth Fund 3.5 74.0 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
|||||||||||||||||||
| Material Fund Change Name [Text Block] | The fund's name changed from Fidelity Freedom® Blend Income Fund to Fidelity Freedom® Blend Retirement Fund during the reporting period. | |||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period.
|
|||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period. | |||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Freedom Blend Retirement Fund - Class K | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend Retirement Fund | |||||||||||||||||||
| Class Name | Fidelity Freedom® Blend Retirement Fund Class K | |||||||||||||||||||
| Trading Symbol | FHHEX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend Retirement Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-835-5092 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 32 | |||||||||||||||||||
| Expense Ratio, Percent | 0.31% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Class K $10,000 $10,220 $10,415 $11,703 $11,587 $11,096 $11,718 $12,342 $13,360 Fidelity Freedom Retirement Composite Index℠ $10,000 $10,223 $10,623 $11,687 $11,652 $11,208 $11,896 $12,555 $13,448 Bloomberg U.S. Aggregate Bond Index $10,000 $10,395 $11,324 $11,404 $10,931 $10,408 $10,585 $11,101 $11,584 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class K 8.25% 2.68% 3.89% Fidelity Freedom Retirement Composite Index℠ 7.11% 2.85% 3.98% Bloomberg U.S. Aggregate Bond Index 4.35% 0.31% 1.96% A From August 31, 2018 Visit www.401k.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.401k.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 217,536,466 | $ 217,536,466 | $ 217,536,466 | $ 217,536,466 | $ 217,536,466 | |||||||||||||||
| Holdings Count | shares | 47 | 47 | 47 | 47 | 47 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 491,972 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 38.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
|||||||||||||||||||
| Holdings [Text Block] | Bond Funds 61.3 Domestic Equity Funds 16.3 International Equity Funds 14.7 Short-Term Funds 7.4 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) Bond Funds - 61.3 Domestic Equity Funds - 16.3 International Equity Funds - 14.7 Short-Term Funds - 7.4 Short-Term Investments and Net Other Assets (Liabilities) - 0.3 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 20.4 Fidelity Series Government Bond Index Fund 10.7 Fidelity Series Investment Grade Bond Fund 9.9 Fidelity Series Corporate Bond Fund 6.4 Fidelity Series Investment Grade Securitized Fund 6.0 Fidelity Series International Developed Markets Bond Index Fund 4.8 Fidelity Series Treasury Bill Index Fund 4.3 Fidelity Series Large Cap Value Index Fund 4.1 Fidelity Series Emerging Markets Opportunities Fund 3.9 Fidelity Series Blue Chip Growth Fund 3.5 74.0 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
|||||||||||||||||||
| Material Fund Change Name [Text Block] | The fund's name changed from Fidelity Freedom® Blend Income Fund to Fidelity Freedom® Blend Retirement Fund during the reporting period. | |||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period.
|
|||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period. | |||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-835-5092</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Freedom Blend 2055 Fund - Premier Class | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2055 Fund | |||||||||||||||||||
| Class Name | Fidelity Freedom® Blend 2055 Fund Premier Class | |||||||||||||||||||
| Trading Symbol | FFBZX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2055 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-544-3455 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
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| Expenses Paid, Amount | $ 23 | |||||||||||||||||||
| Expense Ratio, Percent | 0.21% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE April 6, 2021 through March 31, 2026. Initial investment of $1,000,000,000. Premier Class $1,000,000,000 $1,013,372,418 $944,398,235 $1,144,898,873 $1,209,269,129 $1,477,111,164 Fidelity Freedom 2055 Composite Index℠ $1,000,000,000 $1,031,497,482 $955,734,871 $1,148,236,910 $1,223,433,008 $1,456,250,888 S&P 500® Index $1,000,000,000 $1,127,571,059 $1,040,427,377 $1,351,318,995 $1,462,825,686 $1,723,259,443 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year Life of Fund A Premier Class 22.15% 8.14% Fidelity Freedom 2055 Composite Index℠ 19.03% 7.83% S&P 500® Index 17.80% 11.53% A From April 6, 2021 Visit www.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Apr. 06, 2021 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 2,613,990,291 | $ 2,613,990,291 | $ 2,613,990,291 | $ 2,613,990,291 | $ 2,613,990,291 | |||||||||||||||
| Holdings Count | shares | 42 | 42 | 42 | 42 | 42 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 6,592,844 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 15.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Domestic Equity Funds 55.8 International Equity Funds 41.3 Bond Funds 2.5 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 55.8 International Equity Funds - 41.3 Bond Funds - 2.5 Short-Term Investments and Net Other Assets (Liabilities) - 0.4 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 15.5 Fidelity Series Blue Chip Growth Fund 13.1 Fidelity Series Emerging Markets Opportunities Fund 10.5 Fidelity Series Large Cap Growth Index Fund 8.3 Fidelity Series Large Cap Stock Fund 8.2 Fidelity Series International Value Fund 6.8 Fidelity Series Overseas Fund 6.8 Fidelity Series International Growth Fund 6.8 Fidelity Series Value Discovery Fund 5.5 Fidelity Series Canada Fund 4.1 85.6 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
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| Material Fund Change Expenses [Text Block] | The fees associated with this class changed during the reporting year. The variations in class fees are primarily the result of the following changes:
The fund's contractual management fee was reduced during the reporting period.
Effective June 1, 2025, the fund's expense contract was amended to reduce its total expenses.
|
|||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-3455</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2070 Fund - Class M | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2070 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2070 Fund Class M | |||||||||||||||||||
| Trading Symbol | FRCJX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2070 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 107 | |||||||||||||||||||
| Expense Ratio, Percent | 0.97% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE June 28, 2024 through March 31, 2026. Initial investment of $10,000 and the current sales charge was paid. Class M $9,650 $9,950 $12,016 Fidelity Freedom 2070 Composite Index℠ $10,000 $10,441 $12,428 S&P 500® Index $10,000 $10,380 $12,229 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year Life of Fund A Class M (incl. 3.50% sales charge) 16.55% 11.07% Class M (without 3.50% sales charge) 20.77% 13.35% Fidelity Freedom 2070 Composite Index℠ 19.02% 13.22% S&P 500® Index 17.80% 12.18% A From June 28, 2024 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Jun. 28, 2024 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 47,210,850 | $ 47,210,850 | $ 47,210,850 | $ 47,210,850 | $ 47,210,850 | |||||||||||||||
| Holdings Count | shares | 22 | 22 | 22 | 22 | 22 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 75,991 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 28.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
|||||||||||||||||||
| Holdings [Text Block] | Domestic Equity Funds 53.0 International Equity Funds 42.3 Bond Funds 4.6 Short-Term Investments and Net Other Assets (Liabilities) 0.1 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 53.0 International Equity Funds - 42.3 Bond Funds - 4.6 Short-Term Investments and Net Other Assets (Liabilities) - 0.1 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 14.8 Fidelity Series Blue Chip Growth Fund 12.5 Fidelity Series Emerging Markets Opportunities Fund 10.7 Fidelity Series Large Cap Growth Index Fund 8.0 Fidelity Series Large Cap Stock Fund 7.8 Fidelity Series International Value Fund 7.1 Fidelity Series Overseas Fund 7.1 Fidelity Series International Growth Fund 7.1 Fidelity Series Value Discovery Fund 5.4 Fidelity Series Long-Term Treasury Bond Index Fund 4.6 85.1 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
|||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Freedom Blend 2060 Fund - Premier Class | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2060 Fund | |||||||||||||||||||
| Class Name | Fidelity Freedom® Blend 2060 Fund Premier Class | |||||||||||||||||||
| Trading Symbol | FFCBX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2060 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-544-3455 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 23 | |||||||||||||||||||
| Expense Ratio, Percent | 0.21% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE April 6, 2021 through March 31, 2026. Initial investment of $1,000,000,000. Premier Class $1,000,000,000 $1,013,582,186 $944,029,295 $1,144,377,333 $1,209,218,726 $1,477,038,585 Fidelity Freedom 2060 Composite Index℠ $1,000,000,000 $1,031,497,482 $955,734,871 $1,148,236,910 $1,223,433,008 $1,456,165,678 S&P 500® Index $1,000,000,000 $1,127,571,059 $1,040,427,377 $1,351,318,995 $1,462,825,686 $1,723,259,443 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year Life of Fund A Premier Class 22.15% 8.14% Fidelity Freedom 2060 Composite Index℠ 19.02% 7.83% S&P 500® Index 17.80% 11.53% A From April 6, 2021 Visit www.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Apr. 06, 2021 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 1,461,323,638 | $ 1,461,323,638 | $ 1,461,323,638 | $ 1,461,323,638 | $ 1,461,323,638 | |||||||||||||||
| Holdings Count | shares | 42 | 42 | 42 | 42 | 42 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 3,610,611 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 15.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
|||||||||||||||||||
| Holdings [Text Block] | Domestic Equity Funds 55.9 International Equity Funds 41.4 Bond Funds 2.3 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 55.9 International Equity Funds - 41.4 Bond Funds - 2.3 Short-Term Investments and Net Other Assets (Liabilities) - 0.4 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 15.5 Fidelity Series Blue Chip Growth Fund 13.1 Fidelity Series Emerging Markets Opportunities Fund 10.6 Fidelity Series Large Cap Growth Index Fund 8.3 Fidelity Series Large Cap Stock Fund 8.2 Fidelity Series International Value Fund 6.8 Fidelity Series Overseas Fund 6.8 Fidelity Series International Growth Fund 6.8 Fidelity Series Value Discovery Fund 5.5 Fidelity Series Canada Fund 4.1 85.7 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
|||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The fees associated with this class changed during the reporting year. The variations in class fees are primarily the result of the following changes:
The fund's contractual management fee was reduced during the reporting period.
Effective June 1, 2025, the fund's expense contract was amended to reduce its total expenses.
The fund's contractual proxy and shareholder meeting expense cap expired during the reporting period.
|
|||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-3455</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Freedom Blend 2070 Fund - Premier Class | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2070 Fund | |||||||||||||||||||
| Class Name | Fidelity Freedom® Blend 2070 Fund Premier Class | |||||||||||||||||||
| Trading Symbol | FRCPX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2070 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-544-3455 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
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| Expenses Paid, Amount | $ 23 | |||||||||||||||||||
| Expense Ratio, Percent | 0.20% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
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| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE June 28, 2024 through March 31, 2026. Initial investment of $1,000,000,000. Premier Class $1,000,000,000 $1,036,767,123 $1,261,262,351 Fidelity Freedom 2070 Composite Index℠ $1,000,000,000 $1,044,146,597 $1,242,773,758 S&P 500® Index $1,000,000,000 $1,038,049,093 $1,222,857,869 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year Life of Fund A Premier Class 21.65% 14.18% Fidelity Freedom 2070 Composite Index℠ 19.02% 13.22% S&P 500® Index 17.80% 12.18% A From June 28, 2024 Visit www.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Jun. 28, 2024 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 47,210,850 | $ 47,210,850 | $ 47,210,850 | $ 47,210,850 | $ 47,210,850 | |||||||||||||||
| Holdings Count | shares | 22 | 22 | 22 | 22 | 22 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 75,991 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 28.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Domestic Equity Funds 53.0 International Equity Funds 42.3 Bond Funds 4.6 Short-Term Investments and Net Other Assets (Liabilities) 0.1 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 53.0 International Equity Funds - 42.3 Bond Funds - 4.6 Short-Term Investments and Net Other Assets (Liabilities) - 0.1 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 14.8 Fidelity Series Blue Chip Growth Fund 12.5 Fidelity Series Emerging Markets Opportunities Fund 10.7 Fidelity Series Large Cap Growth Index Fund 8.0 Fidelity Series Large Cap Stock Fund 7.8 Fidelity Series International Value Fund 7.1 Fidelity Series Overseas Fund 7.1 Fidelity Series International Growth Fund 7.1 Fidelity Series Value Discovery Fund 5.4 Fidelity Series Long-Term Treasury Bond Index Fund 4.6 85.1 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
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| Material Fund Change Expenses [Text Block] | The fees associated with this class changed during the reporting year. The variations in class fees are primarily the result of the following changes:
The fund's contractual management fee was reduced during the reporting period.
Effective June 1, 2025, the fund's expense contract was amended to reduce its total expenses.
|
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| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
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| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-3455</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2035 Fund - Class A | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2035 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2035 Fund Class A | |||||||||||||||||||
| Trading Symbol | FHJGX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2035 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 78 | |||||||||||||||||||
| Expense Ratio, Percent | 0.72% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000 and the current sales charge was paid. Class A $9,425 $9,314 $8,486 $12,683 $12,961 $12,024 $14,009 $14,713 $17,194 Fidelity Freedom 2035 Composite Index℠ $10,000 $9,897 $9,181 $13,259 $13,817 $12,836 $14,933 $15,853 $18,246 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class A (incl. 5.75% sales charge) 10.15% 5.02% 7.41% Class A (without 5.75% sales charge) 16.87% 6.28% 8.25% Fidelity Freedom 2035 Composite Index℠ 15.09% 6.59% 8.25% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 4,774,644,697 | $ 4,774,644,697 | $ 4,774,644,697 | $ 4,774,644,697 | $ 4,774,644,697 | |||||||||||||||
| Holdings Count | shares | 48 | 48 | 48 | 48 | 48 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 12,522,295 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 18.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Domestic Equity Funds 39.8 International Equity Funds 30.9 Bond Funds 28.9 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 39.8 International Equity Funds - 30.9 Bond Funds - 28.9 Short-Term Investments and Net Other Assets (Liabilities) - 0.4 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 11.0 Fidelity Series Blue Chip Growth Fund 9.2 Fidelity Series Emerging Markets Opportunities Fund 7.9 Fidelity Series Large Cap Growth Index Fund 5.9 Fidelity Series Large Cap Stock Fund 5.8 Fidelity Series Government Bond Index Fund 5.4 Fidelity Series Investment Grade Bond Fund 5.2 Fidelity Series Overseas Fund 5.0 Fidelity Series International Value Fund 5.0 Fidelity Series International Growth Fund 5.0 65.4 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
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| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2030 Fund - Class Z | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2030 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2030 Fund Class Z | |||||||||||||||||||
| Trading Symbol | FJLMX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2030 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 39 | |||||||||||||||||||
| Expense Ratio, Percent | 0.36% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Class Z $10,000 $9,985 $9,403 $13,184 $13,374 $12,474 $14,223 $14,963 $17,282 Fidelity Freedom 2030 Composite Index℠ $10,000 $9,983 $9,554 $12,953 $13,325 $12,423 $14,120 $14,955 $16,973 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class Z 15.50% 5.56% 7.48% Fidelity Freedom 2030 Composite Index℠ 13.50% 5.55% 7.23% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 4,347,223,120 | $ 4,347,223,120 | $ 4,347,223,120 | $ 4,347,223,120 | $ 4,347,223,120 | |||||||||||||||
| Holdings Count | shares | 48 | 48 | 48 | 48 | 48 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 11,303,201 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 20.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Bond Funds 37.0 Domestic Equity Funds 34.9 International Equity Funds 27.8 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) Bond Funds - 37.0 Domestic Equity Funds - 34.9 International Equity Funds - 27.8 Short-Term Investments and Net Other Assets (Liabilities) - 0.3 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 9.6 Fidelity Series Blue Chip Growth Fund 8.2 Fidelity Series Emerging Markets Opportunities Fund 7.1 Fidelity Series Government Bond Index Fund 6.8 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 6.4 Fidelity Series Investment Grade Bond Fund 6.3 Fidelity Series Large Cap Growth Index Fund 5.2 Fidelity Series Large Cap Stock Fund 5.1 Fidelity Series International Developed Markets Bond Index Fund 4.7 Fidelity Series Overseas Fund 4.4 63.8 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
|||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2025 Fund - Class I | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2025 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2025 Fund Class I | |||||||||||||||||||
| Trading Symbol | FJADX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2025 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 47 | |||||||||||||||||||
| Expense Ratio, Percent | 0.44% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Class I $10,000 $10,043 $9,595 $12,924 $13,027 $12,137 $13,610 $14,312 $16,316 Fidelity Freedom 2025 Composite Index℠ $10,000 $10,043 $9,773 $12,764 $13,051 $12,167 $13,642 $14,434 $16,215 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class I 14.00% 4.77% 6.67% Fidelity Freedom 2025 Composite Index℠ 12.34% 4.90% 6.58% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 2,514,301,835 | $ 2,514,301,835 | $ 2,514,301,835 | $ 2,514,301,835 | $ 2,514,301,835 | |||||||||||||||
| Holdings Count | shares | 47 | 47 | 47 | 47 | 47 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 6,931,716 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 27.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Bond Funds 43.4 Domestic Equity Funds 31.1 International Equity Funds 25.2 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) Bond Funds - 43.4 Domestic Equity Funds - 31.1 International Equity Funds - 25.2 Short-Term Investments and Net Other Assets (Liabilities) - 0.3 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 8.9 Fidelity Series Large Cap Value Index Fund 8.6 Fidelity Series Government Bond Index Fund 7.8 Fidelity Series Investment Grade Bond Fund 7.2 Fidelity Series Blue Chip Growth Fund 7.2 Fidelity Series Emerging Markets Opportunities Fund 6.5 Fidelity Series International Developed Markets Bond Index Fund 4.8 Fidelity Series Corporate Bond Fund 4.7 Fidelity Series Large Cap Growth Index Fund 4.6 Fidelity Series Large Cap Stock Fund 4.5 64.8 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
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| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
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| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Freedom Blend 2015 Fund - Class K | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2015 Fund | |||||||||||||||||||
| Class Name | Fidelity Freedom® Blend 2015 Fund Class K | |||||||||||||||||||
| Trading Symbol | FHEEX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2015 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-835-5092 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
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| Expenses Paid, Amount | $ 34 | |||||||||||||||||||
| Expense Ratio, Percent | 0.32% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Class K $10,000 $10,107 $9,902 $12,451 $12,470 $11,733 $12,789 $13,469 $14,944 Fidelity Freedom 2015 Composite Index℠ $10,000 $10,107 $10,092 $12,336 $12,479 $11,773 $12,850 $13,583 $14,886 Bloomberg U.S. Aggregate Bond Index $10,000 $10,395 $11,324 $11,404 $10,931 $10,408 $10,585 $11,101 $11,584 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class K 10.95% 3.72% 5.44% Fidelity Freedom 2015 Composite Index℠ 9.59% 3.83% 5.39% Bloomberg U.S. Aggregate Bond Index 4.35% 0.31% 1.96% A From August 31, 2018 Visit www.401k.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.401k.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 332,449,887 | $ 332,449,887 | $ 332,449,887 | $ 332,449,887 | $ 332,449,887 | |||||||||||||||
| Holdings Count | shares | 45 | 45 | 45 | 45 | 45 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 950,396 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 25.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
|||||||||||||||||||
| Holdings [Text Block] | Bond Funds 54.3 Domestic Equity Funds 22.1 International Equity Funds 18.6 Short-Term Funds 4.7 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) Bond Funds - 54.3 Domestic Equity Funds - 22.1 International Equity Funds - 18.6 Short-Term Funds - 4.7 Short-Term Investments and Net Other Assets (Liabilities) - 0.3 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 11.7 Fidelity Series Government Bond Index Fund 9.8 Fidelity Series Investment Grade Bond Fund 9.1 Fidelity Series Corporate Bond Fund 5.9 Fidelity Series Large Cap Value Index Fund 5.8 Fidelity Series Investment Grade Securitized Fund 5.5 Fidelity Series Blue Chip Growth Fund 4.9 Fidelity Series Emerging Markets Opportunities Fund 4.9 Fidelity Series International Developed Markets Bond Index Fund 4.8 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 3.9 66.3 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
|||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-835-5092</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2045 Fund - Class Z | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2045 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2045 Fund Class Z | |||||||||||||||||||
| Trading Symbol | FHBFX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2045 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 41 | |||||||||||||||||||
| Expense Ratio, Percent | 0.37% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Class Z $10,000 $9,865 $8,868 $13,831 $14,297 $13,296 $16,107 $16,994 $20,736 Fidelity Freedom 2045 Composite Index℠ $10,000 $9,871 $9,004 $13,506 $14,232 $13,186 $15,842 $16,880 $20,107 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class Z 22.02% 8.44% 10.09% Fidelity Freedom 2045 Composite Index℠ 19.12% 8.28% 9.65% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 4,169,922,346 | $ 4,169,922,346 | $ 4,169,922,346 | $ 4,169,922,346 | $ 4,169,922,346 | |||||||||||||||
| Holdings Count | shares | 41 | 41 | 41 | 41 | 41 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 10,616,108 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 16.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Domestic Equity Funds 54.1 International Equity Funds 40.2 Bond Funds 5.3 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 54.1 International Equity Funds - 40.2 Bond Funds - 5.3 Short-Term Investments and Net Other Assets (Liabilities) - 0.4 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 15.0 Fidelity Series Blue Chip Growth Fund 12.7 Fidelity Series Emerging Markets Opportunities Fund 10.3 Fidelity Series Large Cap Growth Index Fund 8.1 Fidelity Series Large Cap Stock Fund 7.9 Fidelity Series International Value Fund 6.6 Fidelity Series Overseas Fund 6.6 Fidelity Series International Growth Fund 6.6 Fidelity Series Value Discovery Fund 5.4 Fidelity Series Canada Fund 4.0 83.2 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
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| Material Fund Change Expenses [Text Block] | The fees associated with this class changed during the reporting year. The variations in class fees are primarily the result of the following changes:
The fund's contractual management fee was reduced during the reporting period.
|
|||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2035 Fund - Class Z | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2035 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2035 Fund Class Z | |||||||||||||||||||
| Trading Symbol | FHSDX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2035 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 40 | |||||||||||||||||||
| Expense Ratio, Percent | 0.37% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Class Z $10,000 $9,903 $9,059 $13,576 $13,926 $12,964 $15,156 $15,974 $18,728 Fidelity Freedom 2035 Composite Index℠ $10,000 $9,897 $9,181 $13,259 $13,817 $12,836 $14,933 $15,853 $18,246 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class Z 17.24% 6.65% 8.63% Fidelity Freedom 2035 Composite Index℠ 15.09% 6.59% 8.25% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 4,774,644,697 | $ 4,774,644,697 | $ 4,774,644,697 | $ 4,774,644,697 | $ 4,774,644,697 | |||||||||||||||
| Holdings Count | shares | 48 | 48 | 48 | 48 | 48 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 12,522,295 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 18.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Domestic Equity Funds 39.8 International Equity Funds 30.9 Bond Funds 28.9 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 39.8 International Equity Funds - 30.9 Bond Funds - 28.9 Short-Term Investments and Net Other Assets (Liabilities) - 0.4 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 11.0 Fidelity Series Blue Chip Growth Fund 9.2 Fidelity Series Emerging Markets Opportunities Fund 7.9 Fidelity Series Large Cap Growth Index Fund 5.9 Fidelity Series Large Cap Stock Fund 5.8 Fidelity Series Government Bond Index Fund 5.4 Fidelity Series Investment Grade Bond Fund 5.2 Fidelity Series Overseas Fund 5.0 Fidelity Series International Value Fund 5.0 Fidelity Series International Growth Fund 5.0 65.4 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
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| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2010 Fund - Class M | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2010 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2010 Fund Class M | |||||||||||||||||||
| Trading Symbol | FJAZX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2010 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
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| Expenses Paid, Amount | $ 95 | |||||||||||||||||||
| Expense Ratio, Percent | 0.91% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000 and the current sales charge was paid. Class M $9,650 $9,749 $9,645 $11,551 $11,443 $10,780 $11,501 $12,039 $13,080 Fidelity Freedom 2010 Composite Index℠ $10,000 $10,147 $10,290 $12,077 $12,146 $11,556 $12,434 $13,135 $14,196 Bloomberg U.S. Aggregate Bond Index $10,000 $10,395 $11,324 $11,404 $10,931 $10,408 $10,585 $11,101 $11,584 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class M (incl. 3.50% sales charge) 4.85% 1.79% 3.60% Class M (without 3.50% sales charge) 8.65% 2.52% 4.09% Fidelity Freedom 2010 Composite Index℠ 8.08% 3.28% 4.73% Bloomberg U.S. Aggregate Bond Index 4.35% 0.31% 1.96% A From August 31, 2018 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 203,748,419 | $ 203,748,419 | $ 203,748,419 | $ 203,748,419 | $ 203,748,419 | |||||||||||||||
| Holdings Count | shares | 46 | 46 | 46 | 46 | 46 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 441,074 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 28.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Bond Funds 59.4 Domestic Equity Funds 17.9 International Equity Funds 16.0 Short-Term Funds 6.5 Short-Term Investments and Net Other Assets (Liabilities) 0.2 ASSET ALLOCATION (% of Fund's net assets) Bond Funds - 59.4 Domestic Equity Funds - 17.9 International Equity Funds - 16.0 Short-Term Funds - 6.5 Short-Term Investments and Net Other Assets (Liabilities) - 0.2 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 17.8 Fidelity Series Government Bond Index Fund 10.4 Fidelity Series Investment Grade Bond Fund 9.7 Fidelity Series Corporate Bond Fund 6.2 Fidelity Series Investment Grade Securitized Fund 5.8 Fidelity Series International Developed Markets Bond Index Fund 4.8 Fidelity Series Large Cap Value Index Fund 4.6 Fidelity Series Emerging Markets Opportunities Fund 4.2 Fidelity Series Blue Chip Growth Fund 3.9 Fidelity Series Treasury Bill Index Fund 3.8 71.2 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
|||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Freedom Blend 2070 Fund | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2070 Fund | |||||||||||||||||||
| Class Name | Fidelity Freedom® Blend 2070 Fund | |||||||||||||||||||
| Trading Symbol | FRBYX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2070 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-544-8544 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 52 | |||||||||||||||||||
| Expense Ratio, Percent | 0.47% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE June 28, 2024 through March 31, 2026. Initial investment of $10,000. Fidelity Freedom® Blend 2070 Fund $10,000 $10,348 $12,560 Fidelity Freedom 2070 Composite Index℠ $10,000 $10,441 $12,428 S&P 500® Index $10,000 $10,380 $12,229 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year Life of Fund A Fidelity Freedom® Blend 2070 Fund 21.38% 13.91% Fidelity Freedom 2070 Composite Index℠ 19.02% 13.22% S&P 500® Index 17.80% 12.18% A From June 28, 2024 Visit www.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Jun. 28, 2024 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 47,210,850 | $ 47,210,850 | $ 47,210,850 | $ 47,210,850 | $ 47,210,850 | |||||||||||||||
| Holdings Count | shares | 22 | 22 | 22 | 22 | 22 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 75,991 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 28.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
|||||||||||||||||||
| Holdings [Text Block] | Domestic Equity Funds 53.0 International Equity Funds 42.3 Bond Funds 4.6 Short-Term Investments and Net Other Assets (Liabilities) 0.1 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 53.0 International Equity Funds - 42.3 Bond Funds - 4.6 Short-Term Investments and Net Other Assets (Liabilities) - 0.1 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 14.8 Fidelity Series Blue Chip Growth Fund 12.5 Fidelity Series Emerging Markets Opportunities Fund 10.7 Fidelity Series Large Cap Growth Index Fund 8.0 Fidelity Series Large Cap Stock Fund 7.8 Fidelity Series International Value Fund 7.1 Fidelity Series Overseas Fund 7.1 Fidelity Series International Growth Fund 7.1 Fidelity Series Value Discovery Fund 5.4 Fidelity Series Long-Term Treasury Bond Index Fund 4.6 85.1 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
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| Material Fund Change Expenses [Text Block] | The fees associated with this class changed during the reporting year. The variations in class fees are primarily the result of the following changes:
The fund's contractual management fee was reduced during the reporting period.
|
|||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-8544</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Freedom Blend 2020 Fund - Class K | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2020 Fund | |||||||||||||||||||
| Class Name | Fidelity Freedom® Blend 2020 Fund Class K | |||||||||||||||||||
| Trading Symbol | FHCEX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2020 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-835-5092 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 35 | |||||||||||||||||||
| Expense Ratio, Percent | 0.33% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Class K $10,000 $10,073 $9,736 $12,739 $12,811 $11,963 $13,249 $13,948 $15,702 Fidelity Freedom 2020 Composite Index℠ $10,000 $10,073 $9,915 $12,584 $12,802 $11,972 $13,254 $14,017 $15,570 Bloomberg U.S. Aggregate Bond Index $10,000 $10,395 $11,324 $11,404 $10,931 $10,408 $10,585 $11,101 $11,584 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class K 12.57% 4.27% 6.13% Fidelity Freedom 2020 Composite Index℠ 11.08% 4.35% 6.01% Bloomberg U.S. Aggregate Bond Index 4.35% 0.31% 1.96% A From August 31, 2018 Visit www.401k.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.401k.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 1,276,372,296 | $ 1,276,372,296 | $ 1,276,372,296 | $ 1,276,372,296 | $ 1,276,372,296 | |||||||||||||||
| Holdings Count | shares | 49 | 49 | 49 | 49 | 49 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 3,260,714 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 30.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
|||||||||||||||||||
| Holdings [Text Block] | Bond Funds 49.2 Domestic Equity Funds 26.6 International Equity Funds 21.8 Short-Term Funds 2.1 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) Bond Funds - 49.2 Domestic Equity Funds - 26.6 International Equity Funds - 21.8 Short-Term Funds - 2.1 Short-Term Investments and Net Other Assets (Liabilities) - 0.3 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Government Bond Index Fund 9.0 Fidelity Series Investment Grade Bond Fund 8.3 Fidelity Series Large Cap Value Index Fund 7.1 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 6.5 Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 6.2 Fidelity Series Blue Chip Growth Fund 6.0 Fidelity Series Emerging Markets Opportunities Fund 5.7 Fidelity Series Corporate Bond Fund 5.4 Fidelity Series Investment Grade Securitized Fund 5.1 Fidelity Series International Developed Markets Bond Index Fund 4.8 64.1 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
|||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-835-5092</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2040 Fund - Class Z | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2040 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2040 Fund Class Z | |||||||||||||||||||
| Trading Symbol | FHHFX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2040 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
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| Expenses Paid, Amount | $ 41 | |||||||||||||||||||
| Expense Ratio, Percent | 0.37% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Class Z $10,000 $9,881 $8,876 $13,840 $14,308 $13,297 $15,965 $16,853 $20,270 Fidelity Freedom 2040 Composite Index℠ $10,000 $9,871 $9,004 $13,506 $14,229 $13,178 $15,712 $16,727 $19,689 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class Z 20.28% 7.93% 9.77% Fidelity Freedom 2040 Composite Index℠ 17.71% 7.83% 9.35% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 4,622,181,262 | $ 4,622,181,262 | $ 4,622,181,262 | $ 4,622,181,262 | $ 4,622,181,262 | |||||||||||||||
| Holdings Count | shares | 48 | 48 | 48 | 48 | 48 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 11,983,334 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 18.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Domestic Equity Funds 48.6 International Equity Funds 36.7 Bond Funds 14.3 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 48.6 International Equity Funds - 36.7 Bond Funds - 14.3 Short-Term Investments and Net Other Assets (Liabilities) - 0.4 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 13.5 Fidelity Series Blue Chip Growth Fund 11.4 Fidelity Series Emerging Markets Opportunities Fund 9.4 Fidelity Series Large Cap Growth Index Fund 7.2 Fidelity Series Large Cap Stock Fund 7.1 Fidelity Series Overseas Fund 6.0 Fidelity Series International Value Fund 6.0 Fidelity Series International Growth Fund 6.0 Fidelity Series Value Discovery Fund 4.8 Fidelity Series Long-Term Treasury Bond Index Fund 4.2 75.6 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
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| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Freedom Blend 2030 Fund - Premier Class | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2030 Fund | |||||||||||||||||||
| Class Name | Fidelity Freedom® Blend 2030 Fund Premier Class | |||||||||||||||||||
| Trading Symbol | FFBPX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2030 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-544-3455 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 21 | |||||||||||||||||||
| Expense Ratio, Percent | 0.19% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE April 6, 2021 through March 31, 2026. Initial investment of $1,000,000,000. Premier Class $1,000,000,000 $999,429,080 $933,467,904 $1,064,863,881 $1,122,841,877 $1,297,547,760 Fidelity Freedom 2030 Composite Index℠ $1,000,000,000 $1,011,819,224 $943,332,696 $1,072,176,713 $1,135,577,643 $1,288,827,644 S&P 500® Index $1,000,000,000 $1,127,571,059 $1,040,427,377 $1,351,318,995 $1,462,825,686 $1,723,259,443 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year Life of Fund A Premier Class 15.56% 5.36% Fidelity Freedom 2030 Composite Index℠ 13.50% 5.22% S&P 500® Index 17.80% 11.53% A From April 6, 2021 Visit www.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Apr. 06, 2021 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 4,347,223,120 | $ 4,347,223,120 | $ 4,347,223,120 | $ 4,347,223,120 | $ 4,347,223,120 | |||||||||||||||
| Holdings Count | shares | 48 | 48 | 48 | 48 | 48 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 11,303,201 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 20.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Bond Funds 37.0 Domestic Equity Funds 34.9 International Equity Funds 27.8 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) Bond Funds - 37.0 Domestic Equity Funds - 34.9 International Equity Funds - 27.8 Short-Term Investments and Net Other Assets (Liabilities) - 0.3 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 9.6 Fidelity Series Blue Chip Growth Fund 8.2 Fidelity Series Emerging Markets Opportunities Fund 7.1 Fidelity Series Government Bond Index Fund 6.8 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 6.4 Fidelity Series Investment Grade Bond Fund 6.3 Fidelity Series Large Cap Growth Index Fund 5.2 Fidelity Series Large Cap Stock Fund 5.1 Fidelity Series International Developed Markets Bond Index Fund 4.7 Fidelity Series Overseas Fund 4.4 63.8 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
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| Material Fund Change Expenses [Text Block] | The fees associated with this class changed during the reporting year. The variations in class fees are primarily the result of the following changes:
The fund's contractual management fee was reduced during the reporting period.
Effective June 1, 2025, the fund's expense contract was amended to reduce its total expenses.
|
|||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-3455</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2015 Fund - Class A | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2015 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2015 Fund Class A | |||||||||||||||||||
| Trading Symbol | FJAUX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2015 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 70 | |||||||||||||||||||
| Expense Ratio, Percent | 0.67% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000 and the current sales charge was paid. Class A $9,425 $9,505 $9,279 $11,624 $11,598 $10,885 $11,818 $12,409 $13,716 Fidelity Freedom 2015 Composite Index℠ $10,000 $10,107 $10,092 $12,336 $12,479 $11,773 $12,850 $13,583 $14,886 Bloomberg U.S. Aggregate Bond Index $10,000 $10,395 $11,324 $11,404 $10,931 $10,408 $10,585 $11,101 $11,584 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class A (incl. 5.75% sales charge) 4.18% 2.15% 4.25% Class A (without 5.75% sales charge) 10.53% 3.36% 5.07% Fidelity Freedom 2015 Composite Index℠ 9.59% 3.83% 5.39% Bloomberg U.S. Aggregate Bond Index 4.35% 0.31% 1.96% A From August 31, 2018 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 332,449,887 | $ 332,449,887 | $ 332,449,887 | $ 332,449,887 | $ 332,449,887 | |||||||||||||||
| Holdings Count | shares | 45 | 45 | 45 | 45 | 45 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 950,396 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 25.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Bond Funds 54.3 Domestic Equity Funds 22.1 International Equity Funds 18.6 Short-Term Funds 4.7 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) Bond Funds - 54.3 Domestic Equity Funds - 22.1 International Equity Funds - 18.6 Short-Term Funds - 4.7 Short-Term Investments and Net Other Assets (Liabilities) - 0.3 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 11.7 Fidelity Series Government Bond Index Fund 9.8 Fidelity Series Investment Grade Bond Fund 9.1 Fidelity Series Corporate Bond Fund 5.9 Fidelity Series Large Cap Value Index Fund 5.8 Fidelity Series Investment Grade Securitized Fund 5.5 Fidelity Series Blue Chip Growth Fund 4.9 Fidelity Series Emerging Markets Opportunities Fund 4.9 Fidelity Series International Developed Markets Bond Index Fund 4.8 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 3.9 66.3 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
|||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Freedom Blend 2060 Fund | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2060 Fund | |||||||||||||||||||
| Class Name | Fidelity Freedom® Blend 2060 Fund | |||||||||||||||||||
| Trading Symbol | FHANX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2060 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-544-8544 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 53 | |||||||||||||||||||
| Expense Ratio, Percent | 0.47% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Fidelity Freedom® Blend 2060 Fund $10,000 $9,873 $8,851 $13,788 $14,244 $13,229 $16,013 $16,873 $20,552 Fidelity Freedom 2060 Composite Index℠ $10,000 $9,871 $9,004 $13,506 $14,232 $13,186 $15,842 $16,880 $20,091 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Fidelity Freedom® Blend 2060 Fund 21.81% 8.31% 9.97% Fidelity Freedom 2060 Composite Index℠ 19.02% 8.27% 9.64% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit www.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 1,461,323,638 | $ 1,461,323,638 | $ 1,461,323,638 | $ 1,461,323,638 | $ 1,461,323,638 | |||||||||||||||
| Holdings Count | shares | 42 | 42 | 42 | 42 | 42 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 3,610,611 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 15.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Domestic Equity Funds 55.9 International Equity Funds 41.4 Bond Funds 2.3 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 55.9 International Equity Funds - 41.4 Bond Funds - 2.3 Short-Term Investments and Net Other Assets (Liabilities) - 0.4 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 15.5 Fidelity Series Blue Chip Growth Fund 13.1 Fidelity Series Emerging Markets Opportunities Fund 10.6 Fidelity Series Large Cap Growth Index Fund 8.3 Fidelity Series Large Cap Stock Fund 8.2 Fidelity Series International Value Fund 6.8 Fidelity Series Overseas Fund 6.8 Fidelity Series International Growth Fund 6.8 Fidelity Series Value Discovery Fund 5.5 Fidelity Series Canada Fund 4.1 85.7 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
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| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period.
The fund's contractual proxy and shareholder meeting expense cap expired during the reporting period.
|
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| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
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| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-8544</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2065 Fund - Class Z | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2065 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2065 Fund Class Z | |||||||||||||||||||
| Trading Symbol | FAXGX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2065 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 41 | |||||||||||||||||||
| Expense Ratio, Percent | 0.37% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE June 28, 2019 through March 31, 2026. Initial investment of $10,000. Class Z $10,000 $8,680 $13,529 $13,992 $13,017 $15,746 $16,608 $20,266 Fidelity Freedom 2065 Composite Index℠ $10,000 $8,783 $13,174 $13,882 $12,862 $15,453 $16,465 $19,597 S&P 500® Index $10,000 $8,918 $13,944 $16,126 $14,879 $19,326 $20,920 $24,645 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class Z 22.02% 8.42% 11.03% Fidelity Freedom 2065 Composite Index℠ 19.02% 8.27% 10.48% S&P 500® Index 17.80% 12.06% 14.30% A From June 28, 2019 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Jun. 28, 2019 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 560,851,778 | $ 560,851,778 | $ 560,851,778 | $ 560,851,778 | $ 560,851,778 | |||||||||||||||
| Holdings Count | shares | 42 | 42 | 42 | 42 | 42 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 1,336,669 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 16.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Domestic Equity Funds 55.9 International Equity Funds 41.4 Bond Funds 2.3 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 55.9 International Equity Funds - 41.4 Bond Funds - 2.3 Short-Term Investments and Net Other Assets (Liabilities) - 0.4 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 15.6 Fidelity Series Blue Chip Growth Fund 13.1 Fidelity Series Emerging Markets Opportunities Fund 10.6 Fidelity Series Large Cap Growth Index Fund 8.3 Fidelity Series Large Cap Stock Fund 8.2 Fidelity Series International Value Fund 6.8 Fidelity Series Overseas Fund 6.8 Fidelity Series International Growth Fund 6.8 Fidelity Series Value Discovery Fund 5.6 Fidelity Series Canada Fund 4.1 85.9 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
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| Material Fund Change Expenses [Text Block] | The fees associated with this class changed during the reporting year. The variations in class fees are primarily the result of the following changes:
The fund's contractual management fee was reduced during the reporting period.
The fund's contractual proxy and shareholder meeting expense cap expired during the reporting period.
|
|||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Freedom Blend 2055 Fund | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2055 Fund | |||||||||||||||||||
| Class Name | Fidelity Freedom® Blend 2055 Fund | |||||||||||||||||||
| Trading Symbol | FHAOX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2055 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-544-8544 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 53 | |||||||||||||||||||
| Expense Ratio, Percent | 0.47% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Fidelity Freedom® Blend 2055 Fund $10,000 $9,865 $8,856 $13,794 $14,257 $13,250 $16,024 $16,879 $20,563 Fidelity Freedom 2055 Composite Index℠ $10,000 $9,871 $9,004 $13,506 $14,232 $13,186 $15,842 $16,880 $20,092 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Fidelity Freedom® Blend 2055 Fund 21.83% 8.31% 9.97% Fidelity Freedom 2055 Composite Index℠ 19.03% 8.27% 9.64% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit www.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 2,613,990,291 | $ 2,613,990,291 | $ 2,613,990,291 | $ 2,613,990,291 | $ 2,613,990,291 | |||||||||||||||
| Holdings Count | shares | 42 | 42 | 42 | 42 | 42 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 6,592,844 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 15.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
|||||||||||||||||||
| Holdings [Text Block] | Domestic Equity Funds 55.8 International Equity Funds 41.3 Bond Funds 2.5 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 55.8 International Equity Funds - 41.3 Bond Funds - 2.5 Short-Term Investments and Net Other Assets (Liabilities) - 0.4 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 15.5 Fidelity Series Blue Chip Growth Fund 13.1 Fidelity Series Emerging Markets Opportunities Fund 10.5 Fidelity Series Large Cap Growth Index Fund 8.3 Fidelity Series Large Cap Stock Fund 8.2 Fidelity Series International Value Fund 6.8 Fidelity Series Overseas Fund 6.8 Fidelity Series International Growth Fund 6.8 Fidelity Series Value Discovery Fund 5.5 Fidelity Series Canada Fund 4.1 85.6 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
|||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-8544</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2015 Fund - Class I | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2015 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2015 Fund Class I | |||||||||||||||||||
| Trading Symbol | FJAQX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2015 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 44 | |||||||||||||||||||
| Expense Ratio, Percent | 0.42% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Class I $10,000 $10,104 $9,893 $12,421 $12,417 $11,680 $12,720 $13,387 $14,830 Fidelity Freedom 2015 Composite Index℠ $10,000 $10,107 $10,092 $12,336 $12,479 $11,773 $12,850 $13,583 $14,886 Bloomberg U.S. Aggregate Bond Index $10,000 $10,395 $11,324 $11,404 $10,931 $10,408 $10,585 $11,101 $11,584 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class I 10.78% 3.61% 5.33% Fidelity Freedom 2015 Composite Index℠ 9.59% 3.83% 5.39% Bloomberg U.S. Aggregate Bond Index 4.35% 0.31% 1.96% A From August 31, 2018 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 332,449,887 | $ 332,449,887 | $ 332,449,887 | $ 332,449,887 | $ 332,449,887 | |||||||||||||||
| Holdings Count | shares | 45 | 45 | 45 | 45 | 45 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 950,396 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 25.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
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| Holdings [Text Block] | Bond Funds 54.3 Domestic Equity Funds 22.1 International Equity Funds 18.6 Short-Term Funds 4.7 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) Bond Funds - 54.3 Domestic Equity Funds - 22.1 International Equity Funds - 18.6 Short-Term Funds - 4.7 Short-Term Investments and Net Other Assets (Liabilities) - 0.3 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 11.7 Fidelity Series Government Bond Index Fund 9.8 Fidelity Series Investment Grade Bond Fund 9.1 Fidelity Series Corporate Bond Fund 5.9 Fidelity Series Large Cap Value Index Fund 5.8 Fidelity Series Investment Grade Securitized Fund 5.5 Fidelity Series Blue Chip Growth Fund 4.9 Fidelity Series Emerging Markets Opportunities Fund 4.9 Fidelity Series International Developed Markets Bond Index Fund 4.8 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 3.9 66.3 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
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| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
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| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Freedom Blend 2015 Fund - Premier Class | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2015 Fund | |||||||||||||||||||
| Class Name | Fidelity Freedom® Blend 2015 Fund Premier Class | |||||||||||||||||||
| Trading Symbol | FFBJX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2015 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-544-3455 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
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| Expenses Paid, Amount | $ 19 | |||||||||||||||||||
| Expense Ratio, Percent | 0.18% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
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| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE April 6, 2021 through March 31, 2026. Initial investment of $1,000,000,000. Premier Class $1,000,000,000 $991,183,850 $934,038,301 $1,019,087,682 $1,074,766,662 $1,193,841,117 Fidelity Freedom 2015 Composite Index℠ $1,000,000,000 $999,709,906 $943,175,512 $1,029,444,278 $1,088,151,217 $1,192,535,958 Bloomberg U.S. Aggregate Bond Index $1,000,000,000 $953,978,249 $908,346,598 $923,769,592 $968,845,888 $1,010,976,620 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year Life of Fund A Premier Class 11.08% 3.62% Fidelity Freedom 2015 Composite Index℠ 9.59% 3.59% Bloomberg U.S. Aggregate Bond Index 4.35% 0.22% A From April 6, 2021 Visit www.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Apr. 06, 2021 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 332,449,887 | $ 332,449,887 | $ 332,449,887 | $ 332,449,887 | $ 332,449,887 | |||||||||||||||
| Holdings Count | shares | 45 | 45 | 45 | 45 | 45 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 950,396 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 25.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Bond Funds 54.3 Domestic Equity Funds 22.1 International Equity Funds 18.6 Short-Term Funds 4.7 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) Bond Funds - 54.3 Domestic Equity Funds - 22.1 International Equity Funds - 18.6 Short-Term Funds - 4.7 Short-Term Investments and Net Other Assets (Liabilities) - 0.3 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 11.7 Fidelity Series Government Bond Index Fund 9.8 Fidelity Series Investment Grade Bond Fund 9.1 Fidelity Series Corporate Bond Fund 5.9 Fidelity Series Large Cap Value Index Fund 5.8 Fidelity Series Investment Grade Securitized Fund 5.5 Fidelity Series Blue Chip Growth Fund 4.9 Fidelity Series Emerging Markets Opportunities Fund 4.9 Fidelity Series International Developed Markets Bond Index Fund 4.8 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 3.9 66.3 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
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| Material Fund Change Expenses [Text Block] | The fees associated with this class changed during the reporting year. The variations in class fees are primarily the result of the following changes:
The fund's contractual management fee was reduced during the reporting period.
Effective June 1, 2025, the fund's expense contract was amended to reduce its total expenses.
|
|||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-3455</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Freedom Blend 2070 Fund - Class K6 | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2070 Fund | |||||||||||||||||||
| Class Name | Fidelity Freedom® Blend 2070 Fund Class K6 | |||||||||||||||||||
| Trading Symbol | FRCFX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2070 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-835-5092 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 30 | |||||||||||||||||||
| Expense Ratio, Percent | 0.27% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE June 28, 2024 through March 31, 2026. Initial investment of $10,000. Class K6 $10,000 $10,360 $12,601 Fidelity Freedom 2070 Composite Index℠ $10,000 $10,441 $12,428 S&P 500® Index $10,000 $10,380 $12,229 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year Life of Fund A Class K6 21.64% 14.12% Fidelity Freedom 2070 Composite Index℠ 19.02% 13.22% S&P 500® Index 17.80% 12.18% A From June 28, 2024 Visit www.401k.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Jun. 28, 2024 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.401k.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 47,210,850 | $ 47,210,850 | $ 47,210,850 | $ 47,210,850 | $ 47,210,850 | |||||||||||||||
| Holdings Count | shares | 22 | 22 | 22 | 22 | 22 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 75,991 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 28.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Domestic Equity Funds 53.0 International Equity Funds 42.3 Bond Funds 4.6 Short-Term Investments and Net Other Assets (Liabilities) 0.1 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 53.0 International Equity Funds - 42.3 Bond Funds - 4.6 Short-Term Investments and Net Other Assets (Liabilities) - 0.1 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 14.8 Fidelity Series Blue Chip Growth Fund 12.5 Fidelity Series Emerging Markets Opportunities Fund 10.7 Fidelity Series Large Cap Growth Index Fund 8.0 Fidelity Series Large Cap Stock Fund 7.8 Fidelity Series International Value Fund 7.1 Fidelity Series Overseas Fund 7.1 Fidelity Series International Growth Fund 7.1 Fidelity Series Value Discovery Fund 5.4 Fidelity Series Long-Term Treasury Bond Index Fund 4.6 85.1 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
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| Material Fund Change Expenses [Text Block] | The fees associated with this class changed during the reporting year. The variations in class fees are primarily the result of the following changes:
The fund's contractual management fee was reduced during the reporting period.
Effective June 1, 2025, the fund's expense contract was amended to reduce its total expenses.
|
|||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-835-5092</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2025 Fund - Class C | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2025 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2025 Fund Class C | |||||||||||||||||||
| Trading Symbol | FJAEX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2025 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
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| Expenses Paid, Amount | $ 153 | |||||||||||||||||||
| Expense Ratio, Percent | 1.44% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
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| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Class C $10,000 $9,988 $9,444 $12,595 $12,576 $11,586 $12,877 $13,402 $15,120 Fidelity Freedom 2025 Composite Index℠ $10,000 $10,043 $9,773 $12,764 $13,051 $12,167 $13,642 $14,434 $16,215 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class C (incl. contingent deferred sales charge) 11.83% 3.72% 5.60% Class C 12.83% 3.72% 5.60% Fidelity Freedom 2025 Composite Index℠ 12.34% 4.90% 6.58% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 2,514,301,835 | $ 2,514,301,835 | $ 2,514,301,835 | $ 2,514,301,835 | $ 2,514,301,835 | |||||||||||||||
| Holdings Count | shares | 47 | 47 | 47 | 47 | 47 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 6,931,716 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 27.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Bond Funds 43.4 Domestic Equity Funds 31.1 International Equity Funds 25.2 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) Bond Funds - 43.4 Domestic Equity Funds - 31.1 International Equity Funds - 25.2 Short-Term Investments and Net Other Assets (Liabilities) - 0.3 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 8.9 Fidelity Series Large Cap Value Index Fund 8.6 Fidelity Series Government Bond Index Fund 7.8 Fidelity Series Investment Grade Bond Fund 7.2 Fidelity Series Blue Chip Growth Fund 7.2 Fidelity Series Emerging Markets Opportunities Fund 6.5 Fidelity Series International Developed Markets Bond Index Fund 4.8 Fidelity Series Corporate Bond Fund 4.7 Fidelity Series Large Cap Growth Index Fund 4.6 Fidelity Series Large Cap Stock Fund 4.5 64.8 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
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| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
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| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Freedom Blend 2015 Fund | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2015 Fund | |||||||||||||||||||
| Class Name | Fidelity Freedom® Blend 2015 Fund | |||||||||||||||||||
| Trading Symbol | FHAWX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2015 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-544-8544 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
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| Expenses Paid, Amount | $ 44 | |||||||||||||||||||
| Expense Ratio, Percent | 0.42% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Fidelity Freedom® Blend 2015 Fund $10,000 $10,102 $9,891 $12,413 $12,417 $11,683 $12,724 $13,390 $14,838 Fidelity Freedom 2015 Composite Index℠ $10,000 $10,107 $10,092 $12,336 $12,479 $11,773 $12,850 $13,583 $14,886 Bloomberg U.S. Aggregate Bond Index $10,000 $10,395 $11,324 $11,404 $10,931 $10,408 $10,585 $11,101 $11,584 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Fidelity Freedom® Blend 2015 Fund 10.82% 3.63% 5.34% Fidelity Freedom 2015 Composite Index℠ 9.59% 3.83% 5.39% Bloomberg U.S. Aggregate Bond Index 4.35% 0.31% 1.96% A From August 31, 2018 Visit www.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 332,449,887 | $ 332,449,887 | $ 332,449,887 | $ 332,449,887 | $ 332,449,887 | |||||||||||||||
| Holdings Count | shares | 45 | 45 | 45 | 45 | 45 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 950,396 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 25.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Bond Funds 54.3 Domestic Equity Funds 22.1 International Equity Funds 18.6 Short-Term Funds 4.7 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) Bond Funds - 54.3 Domestic Equity Funds - 22.1 International Equity Funds - 18.6 Short-Term Funds - 4.7 Short-Term Investments and Net Other Assets (Liabilities) - 0.3 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 11.7 Fidelity Series Government Bond Index Fund 9.8 Fidelity Series Investment Grade Bond Fund 9.1 Fidelity Series Corporate Bond Fund 5.9 Fidelity Series Large Cap Value Index Fund 5.8 Fidelity Series Investment Grade Securitized Fund 5.5 Fidelity Series Blue Chip Growth Fund 4.9 Fidelity Series Emerging Markets Opportunities Fund 4.9 Fidelity Series International Developed Markets Bond Index Fund 4.8 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 3.9 66.3 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
|||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-8544</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2060 Fund - Class Z | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2060 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2060 Fund Class Z | |||||||||||||||||||
| Trading Symbol | FHJEX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2060 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 41 | |||||||||||||||||||
| Expense Ratio, Percent | 0.37% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Class Z $10,000 $9,872 $8,868 $13,828 $14,295 $13,292 $16,099 $16,984 $20,708 Fidelity Freedom 2060 Composite Index℠ $10,000 $9,871 $9,004 $13,506 $14,232 $13,186 $15,842 $16,880 $20,091 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class Z 21.92% 8.41% 10.07% Fidelity Freedom 2060 Composite Index℠ 19.02% 8.27% 9.64% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 1,461,323,638 | $ 1,461,323,638 | $ 1,461,323,638 | $ 1,461,323,638 | $ 1,461,323,638 | |||||||||||||||
| Holdings Count | shares | 42 | 42 | 42 | 42 | 42 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 3,610,611 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 15.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
|||||||||||||||||||
| Holdings [Text Block] | Domestic Equity Funds 55.9 International Equity Funds 41.4 Bond Funds 2.3 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 55.9 International Equity Funds - 41.4 Bond Funds - 2.3 Short-Term Investments and Net Other Assets (Liabilities) - 0.4 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 15.5 Fidelity Series Blue Chip Growth Fund 13.1 Fidelity Series Emerging Markets Opportunities Fund 10.6 Fidelity Series Large Cap Growth Index Fund 8.3 Fidelity Series Large Cap Stock Fund 8.2 Fidelity Series International Value Fund 6.8 Fidelity Series Overseas Fund 6.8 Fidelity Series International Growth Fund 6.8 Fidelity Series Value Discovery Fund 5.5 Fidelity Series Canada Fund 4.1 85.7 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
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| Material Fund Change Expenses [Text Block] | The fees associated with this class changed during the reporting year. The variations in class fees are primarily the result of the following changes:
The fund's contractual management fee was reduced during the reporting period.
The fund's contractual proxy and shareholder meeting expense cap expired during the reporting period.
|
|||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2065 Fund - Class M | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2065 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2065 Fund Class M | |||||||||||||||||||
| Trading Symbol | FAXEX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2065 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 108 | |||||||||||||||||||
| Expense Ratio, Percent | 0.97% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE June 28, 2019 through March 31, 2026. Initial investment of $10,000 and the current sales charge was paid. Class M $9,650 $8,338 $12,916 $13,272 $12,277 $14,763 $15,485 $18,777 Fidelity Freedom 2065 Composite Index℠ $10,000 $8,783 $13,174 $13,882 $12,862 $15,453 $16,465 $19,597 S&P 500® Index $10,000 $8,918 $13,944 $16,126 $14,879 $19,326 $20,920 $24,645 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class M (incl. 3.50% sales charge) 17.02% 7.01% 9.78% Class M (without 3.50% sales charge) 21.26% 7.77% 10.36% Fidelity Freedom 2065 Composite Index℠ 19.02% 8.27% 10.48% S&P 500® Index 17.80% 12.06% 14.30% A From June 28, 2019 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Jun. 28, 2019 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 560,851,778 | $ 560,851,778 | $ 560,851,778 | $ 560,851,778 | $ 560,851,778 | |||||||||||||||
| Holdings Count | shares | 42 | 42 | 42 | 42 | 42 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 1,336,669 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 16.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
|||||||||||||||||||
| Holdings [Text Block] | Domestic Equity Funds 55.9 International Equity Funds 41.4 Bond Funds 2.3 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 55.9 International Equity Funds - 41.4 Bond Funds - 2.3 Short-Term Investments and Net Other Assets (Liabilities) - 0.4 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 15.6 Fidelity Series Blue Chip Growth Fund 13.1 Fidelity Series Emerging Markets Opportunities Fund 10.6 Fidelity Series Large Cap Growth Index Fund 8.3 Fidelity Series Large Cap Stock Fund 8.2 Fidelity Series International Value Fund 6.8 Fidelity Series Overseas Fund 6.8 Fidelity Series International Growth Fund 6.8 Fidelity Series Value Discovery Fund 5.6 Fidelity Series Canada Fund 4.1 85.9 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
|||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period.
The fund's contractual proxy and shareholder meeting expense cap expired during the reporting period.
|
|||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Freedom Blend Retirement Fund | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend Retirement Fund | |||||||||||||||||||
| Class Name | Fidelity Freedom® Blend Retirement Fund | |||||||||||||||||||
| Trading Symbol | FHBZX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend Retirement Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-544-8544 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
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| Expenses Paid, Amount | $ 43 | |||||||||||||||||||
| Expense Ratio, Percent | 0.41% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
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| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Fidelity Freedom® Blend Retirement Fund $10,000 $10,204 $10,391 $11,667 $11,550 $11,047 $11,654 $12,253 $13,242 Fidelity Freedom Retirement Composite Index℠ $10,000 $10,223 $10,623 $11,687 $11,652 $11,208 $11,896 $12,555 $13,448 Bloomberg U.S. Aggregate Bond Index $10,000 $10,395 $11,324 $11,404 $10,931 $10,408 $10,585 $11,101 $11,584 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Fidelity Freedom® Blend Retirement Fund 8.07% 2.56% 3.77% Fidelity Freedom Retirement Composite Index℠ 7.11% 2.85% 3.98% Bloomberg U.S. Aggregate Bond Index 4.35% 0.31% 1.96% A From August 31, 2018 Visit www.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 217,536,466 | $ 217,536,466 | $ 217,536,466 | $ 217,536,466 | $ 217,536,466 | |||||||||||||||
| Holdings Count | shares | 47 | 47 | 47 | 47 | 47 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 491,972 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 38.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Bond Funds 61.3 Domestic Equity Funds 16.3 International Equity Funds 14.7 Short-Term Funds 7.4 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) Bond Funds - 61.3 Domestic Equity Funds - 16.3 International Equity Funds - 14.7 Short-Term Funds - 7.4 Short-Term Investments and Net Other Assets (Liabilities) - 0.3 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 20.4 Fidelity Series Government Bond Index Fund 10.7 Fidelity Series Investment Grade Bond Fund 9.9 Fidelity Series Corporate Bond Fund 6.4 Fidelity Series Investment Grade Securitized Fund 6.0 Fidelity Series International Developed Markets Bond Index Fund 4.8 Fidelity Series Treasury Bill Index Fund 4.3 Fidelity Series Large Cap Value Index Fund 4.1 Fidelity Series Emerging Markets Opportunities Fund 3.9 Fidelity Series Blue Chip Growth Fund 3.5 74.0 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
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| Material Fund Change Name [Text Block] | The fund's name changed from Fidelity Freedom® Blend Income Fund to Fidelity Freedom® Blend Retirement Fund during the reporting period. | |||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period.
|
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| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period. | |||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-8544</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Freedom Blend 2045 Fund - Class K | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2045 Fund | |||||||||||||||||||
| Class Name | Fidelity Freedom® Blend 2045 Fund Class K | |||||||||||||||||||
| Trading Symbol | FHXDX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2045 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-835-5092 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 41 | |||||||||||||||||||
| Expense Ratio, Percent | 0.37% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Class K $10,000 $9,865 $8,865 $13,832 $14,295 $13,304 $16,109 $16,993 $20,734 Fidelity Freedom 2045 Composite Index℠ $10,000 $9,871 $9,004 $13,506 $14,232 $13,186 $15,842 $16,880 $20,107 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class K 22.02% 8.43% 10.09% Fidelity Freedom 2045 Composite Index℠ 19.12% 8.28% 9.65% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit www.401k.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.401k.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 4,169,922,346 | $ 4,169,922,346 | $ 4,169,922,346 | $ 4,169,922,346 | $ 4,169,922,346 | |||||||||||||||
| Holdings Count | shares | 41 | 41 | 41 | 41 | 41 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 10,616,108 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 16.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Domestic Equity Funds 54.1 International Equity Funds 40.2 Bond Funds 5.3 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 54.1 International Equity Funds - 40.2 Bond Funds - 5.3 Short-Term Investments and Net Other Assets (Liabilities) - 0.4 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 15.0 Fidelity Series Blue Chip Growth Fund 12.7 Fidelity Series Emerging Markets Opportunities Fund 10.3 Fidelity Series Large Cap Growth Index Fund 8.1 Fidelity Series Large Cap Stock Fund 7.9 Fidelity Series International Value Fund 6.6 Fidelity Series Overseas Fund 6.6 Fidelity Series International Growth Fund 6.6 Fidelity Series Value Discovery Fund 5.4 Fidelity Series Canada Fund 4.0 83.2 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
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| Material Fund Change Expenses [Text Block] | The fees associated with this class changed during the reporting year. The variations in class fees are primarily the result of the following changes:
The fund's contractual management fee was reduced during the reporting period.
|
|||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-835-5092</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Freedom Blend 2035 Fund | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2035 Fund | |||||||||||||||||||
| Class Name | Fidelity Freedom® Blend 2035 Fund | |||||||||||||||||||
| Trading Symbol | FHASX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2035 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-544-8544 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 51 | |||||||||||||||||||
| Expense Ratio, Percent | 0.47% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Fidelity Freedom® Blend 2035 Fund $10,000 $9,904 $9,045 $13,541 $13,877 $12,907 $15,078 $15,865 $18,592 Fidelity Freedom 2035 Composite Index℠ $10,000 $9,897 $9,181 $13,259 $13,817 $12,836 $14,933 $15,853 $18,246 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Fidelity Freedom® Blend 2035 Fund 17.18% 6.54% 8.52% Fidelity Freedom 2035 Composite Index℠ 15.09% 6.59% 8.25% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit www.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 4,774,644,697 | $ 4,774,644,697 | $ 4,774,644,697 | $ 4,774,644,697 | $ 4,774,644,697 | |||||||||||||||
| Holdings Count | shares | 48 | 48 | 48 | 48 | 48 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 12,522,295 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 18.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Domestic Equity Funds 39.8 International Equity Funds 30.9 Bond Funds 28.9 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 39.8 International Equity Funds - 30.9 Bond Funds - 28.9 Short-Term Investments and Net Other Assets (Liabilities) - 0.4 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 11.0 Fidelity Series Blue Chip Growth Fund 9.2 Fidelity Series Emerging Markets Opportunities Fund 7.9 Fidelity Series Large Cap Growth Index Fund 5.9 Fidelity Series Large Cap Stock Fund 5.8 Fidelity Series Government Bond Index Fund 5.4 Fidelity Series Investment Grade Bond Fund 5.2 Fidelity Series Overseas Fund 5.0 Fidelity Series International Value Fund 5.0 Fidelity Series International Growth Fund 5.0 65.4 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
|||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
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| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-8544</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Freedom Blend 2040 Fund - Premier Class | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2040 Fund | |||||||||||||||||||
| Class Name | Fidelity Freedom® Blend 2040 Fund Premier Class | |||||||||||||||||||
| Trading Symbol | FFBTX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2040 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-544-3455 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
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| Expenses Paid, Amount | $ 23 | |||||||||||||||||||
| Expense Ratio, Percent | 0.21% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE April 6, 2021 through March 31, 2026. Initial investment of $1,000,000,000. Premier Class $1,000,000,000 $1,012,757,689 $942,915,294 $1,133,613,785 $1,198,504,362 $1,444,199,867 Fidelity Freedom 2040 Composite Index℠ $1,000,000,000 $1,031,285,726 $955,126,569 $1,138,795,898 $1,212,374,114 $1,427,081,742 S&P 500® Index $1,000,000,000 $1,127,571,059 $1,040,427,377 $1,351,318,995 $1,462,825,686 $1,723,259,443 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year Life of Fund A Premier Class 20.50% 7.65% Fidelity Freedom 2040 Composite Index℠ 17.71% 7.39% S&P 500® Index 17.80% 11.53% A From April 6, 2021 Visit www.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Apr. 06, 2021 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 4,622,181,262 | $ 4,622,181,262 | $ 4,622,181,262 | $ 4,622,181,262 | $ 4,622,181,262 | |||||||||||||||
| Holdings Count | shares | 48 | 48 | 48 | 48 | 48 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 11,983,334 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 18.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Domestic Equity Funds 48.6 International Equity Funds 36.7 Bond Funds 14.3 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 48.6 International Equity Funds - 36.7 Bond Funds - 14.3 Short-Term Investments and Net Other Assets (Liabilities) - 0.4 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 13.5 Fidelity Series Blue Chip Growth Fund 11.4 Fidelity Series Emerging Markets Opportunities Fund 9.4 Fidelity Series Large Cap Growth Index Fund 7.2 Fidelity Series Large Cap Stock Fund 7.1 Fidelity Series Overseas Fund 6.0 Fidelity Series International Value Fund 6.0 Fidelity Series International Growth Fund 6.0 Fidelity Series Value Discovery Fund 4.8 Fidelity Series Long-Term Treasury Bond Index Fund 4.2 75.6 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
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| Material Fund Change Expenses [Text Block] | The fees associated with this class changed during the reporting year. The variations in class fees are primarily the result of the following changes:
The fund's contractual management fee was reduced during the reporting period.
Effective June 1, 2025, the fund's expense contract was amended to reduce its total expenses.
|
|||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-3455</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2060 Fund - Class A | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2060 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2060 Fund Class A | |||||||||||||||||||
| Trading Symbol | FHNEX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2060 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 80 | |||||||||||||||||||
| Expense Ratio, Percent | 0.72% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000 and the current sales charge was paid. Class A $9,425 $9,283 $8,305 $12,904 $13,301 $12,326 $14,880 $15,645 $19,008 Fidelity Freedom 2060 Composite Index℠ $10,000 $9,871 $9,004 $13,506 $14,232 $13,186 $15,842 $16,880 $20,091 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class A (incl. 5.75% sales charge) 14.51% 6.78% 8.84% Class A (without 5.75% sales charge) 21.49% 8.05% 9.69% Fidelity Freedom 2060 Composite Index℠ 19.02% 8.27% 9.64% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 1,461,323,638 | $ 1,461,323,638 | $ 1,461,323,638 | $ 1,461,323,638 | $ 1,461,323,638 | |||||||||||||||
| Holdings Count | shares | 42 | 42 | 42 | 42 | 42 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 3,610,611 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 15.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
|||||||||||||||||||
| Holdings [Text Block] | Domestic Equity Funds 55.9 International Equity Funds 41.4 Bond Funds 2.3 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 55.9 International Equity Funds - 41.4 Bond Funds - 2.3 Short-Term Investments and Net Other Assets (Liabilities) - 0.4 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 15.5 Fidelity Series Blue Chip Growth Fund 13.1 Fidelity Series Emerging Markets Opportunities Fund 10.6 Fidelity Series Large Cap Growth Index Fund 8.3 Fidelity Series Large Cap Stock Fund 8.2 Fidelity Series International Value Fund 6.8 Fidelity Series Overseas Fund 6.8 Fidelity Series International Growth Fund 6.8 Fidelity Series Value Discovery Fund 5.5 Fidelity Series Canada Fund 4.1 85.7 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
|||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period.
The fund's contractual proxy and shareholder meeting expense cap expired during the reporting period.
|
|||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Freedom Blend 2065 Fund - Premier Class | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2065 Fund | |||||||||||||||||||
| Class Name | Fidelity Freedom® Blend 2065 Fund Premier Class | |||||||||||||||||||
| Trading Symbol | FFCHX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2065 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-544-3455 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 23 | |||||||||||||||||||
| Expense Ratio, Percent | 0.21% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE April 6, 2021 through March 31, 2026. Initial investment of $1,000,000,000. Premier Class $1,000,000,000 $1,013,612,629 $944,578,737 $1,143,853,411 $1,209,156,691 $1,476,503,148 Fidelity Freedom 2065 Composite Index℠ $1,000,000,000 $1,031,497,482 $955,734,871 $1,148,236,910 $1,223,433,008 $1,456,165,678 S&P 500® Index $1,000,000,000 $1,127,571,059 $1,040,427,377 $1,351,318,995 $1,462,825,686 $1,723,259,443 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year Life of Fund A Premier Class 22.11% 8.13% Fidelity Freedom 2065 Composite Index℠ 19.02% 7.83% S&P 500® Index 17.80% 11.53% A From April 6, 2021 Visit www.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Apr. 06, 2021 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 560,851,778 | $ 560,851,778 | $ 560,851,778 | $ 560,851,778 | $ 560,851,778 | |||||||||||||||
| Holdings Count | shares | 42 | 42 | 42 | 42 | 42 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 1,336,669 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 16.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
|||||||||||||||||||
| Holdings [Text Block] | Domestic Equity Funds 55.9 International Equity Funds 41.4 Bond Funds 2.3 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 55.9 International Equity Funds - 41.4 Bond Funds - 2.3 Short-Term Investments and Net Other Assets (Liabilities) - 0.4 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 15.6 Fidelity Series Blue Chip Growth Fund 13.1 Fidelity Series Emerging Markets Opportunities Fund 10.6 Fidelity Series Large Cap Growth Index Fund 8.3 Fidelity Series Large Cap Stock Fund 8.2 Fidelity Series International Value Fund 6.8 Fidelity Series Overseas Fund 6.8 Fidelity Series International Growth Fund 6.8 Fidelity Series Value Discovery Fund 5.6 Fidelity Series Canada Fund 4.1 85.9 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
|||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The fees associated with this class changed during the reporting year. The variations in class fees are primarily the result of the following changes:
The fund's contractual management fee was reduced during the reporting period.
Effective June 1, 2025, the fund's expense contract was amended to reduce its total expenses.
The fund's contractual proxy and shareholder meeting expense cap expired during the reporting period.
|
|||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-3455</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Freedom Blend 2025 Fund - Class K | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2025 Fund | |||||||||||||||||||
| Class Name | Fidelity Freedom® Blend 2025 Fund Class K | |||||||||||||||||||
| Trading Symbol | FHBEX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2025 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-835-5092 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 36 | |||||||||||||||||||
| Expense Ratio, Percent | 0.34% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Class K $10,000 $10,047 $9,610 $12,958 $13,074 $12,192 $13,689 $14,409 $16,442 Fidelity Freedom 2025 Composite Index℠ $10,000 $10,043 $9,773 $12,764 $13,051 $12,167 $13,642 $14,434 $16,215 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class K 14.11% 4.88% 6.78% Fidelity Freedom 2025 Composite Index℠ 12.34% 4.90% 6.58% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit www.401k.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.401k.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 2,514,301,835 | $ 2,514,301,835 | $ 2,514,301,835 | $ 2,514,301,835 | $ 2,514,301,835 | |||||||||||||||
| Holdings Count | shares | 47 | 47 | 47 | 47 | 47 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 6,931,716 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 27.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Bond Funds 43.4 Domestic Equity Funds 31.1 International Equity Funds 25.2 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) Bond Funds - 43.4 Domestic Equity Funds - 31.1 International Equity Funds - 25.2 Short-Term Investments and Net Other Assets (Liabilities) - 0.3 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 8.9 Fidelity Series Large Cap Value Index Fund 8.6 Fidelity Series Government Bond Index Fund 7.8 Fidelity Series Investment Grade Bond Fund 7.2 Fidelity Series Blue Chip Growth Fund 7.2 Fidelity Series Emerging Markets Opportunities Fund 6.5 Fidelity Series International Developed Markets Bond Index Fund 4.8 Fidelity Series Corporate Bond Fund 4.7 Fidelity Series Large Cap Growth Index Fund 4.6 Fidelity Series Large Cap Stock Fund 4.5 64.8 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
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| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
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| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-835-5092</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Freedom Blend 2065 Fund - Class K6 | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2065 Fund | |||||||||||||||||||
| Class Name | Fidelity Freedom® Blend 2065 Fund Class K6 | |||||||||||||||||||
| Trading Symbol | FFBQX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2065 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-835-5092 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 30 | |||||||||||||||||||
| Expense Ratio, Percent | 0.27% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE June 28, 2019 through March 31, 2026. Initial investment of $10,000. Class K6 $10,000 $8,680 $13,549 $14,023 $13,065 $15,821 $16,711 $20,395 Fidelity Freedom 2065 Composite Index℠ $10,000 $8,783 $13,174 $13,882 $12,862 $15,453 $16,465 $19,597 S&P 500® Index $10,000 $8,918 $13,944 $16,126 $14,879 $19,326 $20,920 $24,645 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class K6 22.04% 8.52% 11.14% Fidelity Freedom 2065 Composite Index℠ 19.02% 8.27% 10.48% S&P 500® Index 17.80% 12.06% 14.30% A From June 28, 2019 Visit www.401k.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Jun. 28, 2019 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.401k.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 560,851,778 | $ 560,851,778 | $ 560,851,778 | $ 560,851,778 | $ 560,851,778 | |||||||||||||||
| Holdings Count | shares | 42 | 42 | 42 | 42 | 42 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 1,336,669 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 16.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Domestic Equity Funds 55.9 International Equity Funds 41.4 Bond Funds 2.3 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 55.9 International Equity Funds - 41.4 Bond Funds - 2.3 Short-Term Investments and Net Other Assets (Liabilities) - 0.4 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 15.6 Fidelity Series Blue Chip Growth Fund 13.1 Fidelity Series Emerging Markets Opportunities Fund 10.6 Fidelity Series Large Cap Growth Index Fund 8.3 Fidelity Series Large Cap Stock Fund 8.2 Fidelity Series International Value Fund 6.8 Fidelity Series Overseas Fund 6.8 Fidelity Series International Growth Fund 6.8 Fidelity Series Value Discovery Fund 5.6 Fidelity Series Canada Fund 4.1 85.9 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
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| Material Fund Change Expenses [Text Block] | The fees associated with this class changed during the reporting year. The variations in class fees are primarily the result of the following changes:
The fund's contractual management fee was reduced during the reporting period.
Effective June 1, 2025, the fund's expense contract was amended to reduce its total expenses.
The fund's contractual proxy and shareholder meeting expense cap expired during the reporting period.
|
|||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-835-5092</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Freedom Blend 2040 Fund - Class K | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2040 Fund | |||||||||||||||||||
| Class Name | Fidelity Freedom® Blend 2040 Fund Class K | |||||||||||||||||||
| Trading Symbol | FHYDX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2040 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-835-5092 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 41 | |||||||||||||||||||
| Expense Ratio, Percent | 0.37% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Class K $10,000 $9,881 $8,871 $13,837 $14,306 $13,294 $15,968 $16,845 $20,278 Fidelity Freedom 2040 Composite Index℠ $10,000 $9,871 $9,004 $13,506 $14,229 $13,178 $15,712 $16,727 $19,689 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class K 20.37% 7.94% 9.77% Fidelity Freedom 2040 Composite Index℠ 17.71% 7.83% 9.35% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit www.401k.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.401k.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 4,622,181,262 | $ 4,622,181,262 | $ 4,622,181,262 | $ 4,622,181,262 | $ 4,622,181,262 | |||||||||||||||
| Holdings Count | shares | 48 | 48 | 48 | 48 | 48 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 11,983,334 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 18.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Domestic Equity Funds 48.6 International Equity Funds 36.7 Bond Funds 14.3 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 48.6 International Equity Funds - 36.7 Bond Funds - 14.3 Short-Term Investments and Net Other Assets (Liabilities) - 0.4 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 13.5 Fidelity Series Blue Chip Growth Fund 11.4 Fidelity Series Emerging Markets Opportunities Fund 9.4 Fidelity Series Large Cap Growth Index Fund 7.2 Fidelity Series Large Cap Stock Fund 7.1 Fidelity Series Overseas Fund 6.0 Fidelity Series International Value Fund 6.0 Fidelity Series International Growth Fund 6.0 Fidelity Series Value Discovery Fund 4.8 Fidelity Series Long-Term Treasury Bond Index Fund 4.2 75.6 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
|||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-835-5092</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2025 Fund - Class A | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2025 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2025 Fund Class A | |||||||||||||||||||
| Trading Symbol | FJAHX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2025 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 74 | |||||||||||||||||||
| Expense Ratio, Percent | 0.69% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000 and the current sales charge was paid. Class A $9,425 $9,452 $9,005 $12,103 $12,174 $11,308 $12,644 $13,261 $15,082 Fidelity Freedom 2025 Composite Index℠ $10,000 $10,043 $9,773 $12,764 $13,051 $12,167 $13,642 $14,434 $16,215 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class A (incl. 5.75% sales charge) 7.20% 3.27% 5.57% Class A (without 5.75% sales charge) 13.74% 4.50% 6.40% Fidelity Freedom 2025 Composite Index℠ 12.34% 4.90% 6.58% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 2,514,301,835 | $ 2,514,301,835 | $ 2,514,301,835 | $ 2,514,301,835 | $ 2,514,301,835 | |||||||||||||||
| Holdings Count | shares | 47 | 47 | 47 | 47 | 47 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 6,931,716 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 27.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
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| Holdings [Text Block] | Bond Funds 43.4 Domestic Equity Funds 31.1 International Equity Funds 25.2 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) Bond Funds - 43.4 Domestic Equity Funds - 31.1 International Equity Funds - 25.2 Short-Term Investments and Net Other Assets (Liabilities) - 0.3 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 8.9 Fidelity Series Large Cap Value Index Fund 8.6 Fidelity Series Government Bond Index Fund 7.8 Fidelity Series Investment Grade Bond Fund 7.2 Fidelity Series Blue Chip Growth Fund 7.2 Fidelity Series Emerging Markets Opportunities Fund 6.5 Fidelity Series International Developed Markets Bond Index Fund 4.8 Fidelity Series Corporate Bond Fund 4.7 Fidelity Series Large Cap Growth Index Fund 4.6 Fidelity Series Large Cap Stock Fund 4.5 64.8 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
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| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
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| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Freedom Blend Retirement Fund - Premier Class | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend Retirement Fund | |||||||||||||||||||
| Class Name | Fidelity Freedom® Blend Retirement Fund Premier Class | |||||||||||||||||||
| Trading Symbol | FFBCX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend Retirement Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-544-3455 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
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| Expenses Paid, Amount | $ 18 | |||||||||||||||||||
| Expense Ratio, Percent | 0.17% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
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| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE April 6, 2021 through March 31, 2026. Initial investment of $1,000,000,000. Premier Class $1,000,000,000 $984,783,796 $943,966,332 $998,224,638 $1,052,781,532 $1,140,458,744 Fidelity Freedom Retirement Composite Index℠ $1,000,000,000 $990,005,562 $952,227,677 $1,010,725,618 $1,066,703,593 $1,142,569,843 Bloomberg U.S. Aggregate Bond Index $1,000,000,000 $953,978,249 $908,346,598 $923,769,592 $968,845,888 $1,010,976,620 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year Life of Fund A Premier Class 8.33% 2.67% Fidelity Freedom Retirement Composite Index℠ 7.11% 2.71% Bloomberg U.S. Aggregate Bond Index 4.35% 0.22% A From April 6, 2021 Visit www.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Apr. 06, 2021 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 217,536,466 | $ 217,536,466 | $ 217,536,466 | $ 217,536,466 | $ 217,536,466 | |||||||||||||||
| Holdings Count | shares | 47 | 47 | 47 | 47 | 47 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 491,972 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 38.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Bond Funds 61.3 Domestic Equity Funds 16.3 International Equity Funds 14.7 Short-Term Funds 7.4 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) Bond Funds - 61.3 Domestic Equity Funds - 16.3 International Equity Funds - 14.7 Short-Term Funds - 7.4 Short-Term Investments and Net Other Assets (Liabilities) - 0.3 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 20.4 Fidelity Series Government Bond Index Fund 10.7 Fidelity Series Investment Grade Bond Fund 9.9 Fidelity Series Corporate Bond Fund 6.4 Fidelity Series Investment Grade Securitized Fund 6.0 Fidelity Series International Developed Markets Bond Index Fund 4.8 Fidelity Series Treasury Bill Index Fund 4.3 Fidelity Series Large Cap Value Index Fund 4.1 Fidelity Series Emerging Markets Opportunities Fund 3.9 Fidelity Series Blue Chip Growth Fund 3.5 74.0 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
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| Material Fund Change Name [Text Block] | The fund's name changed from Fidelity Freedom® Blend Income Fund to Fidelity Freedom® Blend Retirement Fund during the reporting period.
|
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| Material Fund Change Expenses [Text Block] | The fees associated with this class changed during the reporting year. The variations in class fees are primarily the result of the following changes:
The fund's contractual management fee was reduced during the reporting period.
Effective June 1, 2025, the fund's expense contract was amended to reduce its total expenses.
|
|||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period. | |||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-3455</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Freedom Blend 2060 Fund - Class K | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2060 Fund | |||||||||||||||||||
| Class Name | Fidelity Freedom® Blend 2060 Fund Class K | |||||||||||||||||||
| Trading Symbol | FHTDX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2060 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-835-5092 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 41 | |||||||||||||||||||
| Expense Ratio, Percent | 0.37% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Class K $10,000 $9,872 $8,863 $13,828 $14,295 $13,300 $16,099 $16,990 $20,706 Fidelity Freedom 2060 Composite Index℠ $10,000 $9,871 $9,004 $13,506 $14,232 $13,186 $15,842 $16,880 $20,091 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class K 21.87% 8.41% 10.07% Fidelity Freedom 2060 Composite Index℠ 19.02% 8.27% 9.64% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit www.401k.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.401k.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 1,461,323,638 | $ 1,461,323,638 | $ 1,461,323,638 | $ 1,461,323,638 | $ 1,461,323,638 | |||||||||||||||
| Holdings Count | shares | 42 | 42 | 42 | 42 | 42 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 3,610,611 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 15.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Domestic Equity Funds 55.9 International Equity Funds 41.4 Bond Funds 2.3 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 55.9 International Equity Funds - 41.4 Bond Funds - 2.3 Short-Term Investments and Net Other Assets (Liabilities) - 0.4 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 15.5 Fidelity Series Blue Chip Growth Fund 13.1 Fidelity Series Emerging Markets Opportunities Fund 10.6 Fidelity Series Large Cap Growth Index Fund 8.3 Fidelity Series Large Cap Stock Fund 8.2 Fidelity Series International Value Fund 6.8 Fidelity Series Overseas Fund 6.8 Fidelity Series International Growth Fund 6.8 Fidelity Series Value Discovery Fund 5.5 Fidelity Series Canada Fund 4.1 85.7 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
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| Material Fund Change Expenses [Text Block] | The fees associated with this class changed during the reporting year. The variations in class fees are primarily the result of the following changes:
The fund's contractual management fee was reduced during the reporting period.
The fund's contractual proxy and shareholder meeting expense cap expired during the reporting period.
|
|||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
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| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-835-5092</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Freedom Blend 2030 Fund - Class K6 | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2030 Fund | |||||||||||||||||||
| Class Name | Fidelity Freedom® Blend 2030 Fund Class K6 | |||||||||||||||||||
| Trading Symbol | FHKDX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2030 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-835-5092 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 28 | |||||||||||||||||||
| Expense Ratio, Percent | 0.26% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Class K6 $10,000 $9,989 $9,418 $13,216 $13,422 $12,534 $14,303 $15,062 $17,406 Fidelity Freedom 2030 Composite Index℠ $10,000 $9,983 $9,554 $12,953 $13,325 $12,423 $14,120 $14,955 $16,973 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class K6 15.57% 5.66% 7.58% Fidelity Freedom 2030 Composite Index℠ 13.50% 5.55% 7.23% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit www.401k.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.401k.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 4,347,223,120 | $ 4,347,223,120 | $ 4,347,223,120 | $ 4,347,223,120 | $ 4,347,223,120 | |||||||||||||||
| Holdings Count | shares | 48 | 48 | 48 | 48 | 48 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 11,303,201 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 20.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Bond Funds 37.0 Domestic Equity Funds 34.9 International Equity Funds 27.8 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) Bond Funds - 37.0 Domestic Equity Funds - 34.9 International Equity Funds - 27.8 Short-Term Investments and Net Other Assets (Liabilities) - 0.3 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 9.6 Fidelity Series Blue Chip Growth Fund 8.2 Fidelity Series Emerging Markets Opportunities Fund 7.1 Fidelity Series Government Bond Index Fund 6.8 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 6.4 Fidelity Series Investment Grade Bond Fund 6.3 Fidelity Series Large Cap Growth Index Fund 5.2 Fidelity Series Large Cap Stock Fund 5.1 Fidelity Series International Developed Markets Bond Index Fund 4.7 Fidelity Series Overseas Fund 4.4 63.8 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
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| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period.
Effective June 1, 2025, the fund's expense contract was amended to reduce its total expenses.
|
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| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
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| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-835-5092</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Freedom Blend 2050 Fund - Premier Class | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2050 Fund | |||||||||||||||||||
| Class Name | Fidelity Freedom® Blend 2050 Fund Premier Class | |||||||||||||||||||
| Trading Symbol | FFBWX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2050 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-544-3455 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
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| Expenses Paid, Amount | $ 23 | |||||||||||||||||||
| Expense Ratio, Percent | 0.21% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
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| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE April 6, 2021 through March 31, 2026. Initial investment of $1,000,000,000. Premier Class $1,000,000,000 $1,013,815,823 $944,036,734 $1,143,995,705 $1,208,791,651 $1,477,146,723 Fidelity Freedom 2050 Composite Index℠ $1,000,000,000 $1,031,497,482 $955,734,871 $1,148,236,910 $1,223,433,008 $1,456,745,885 S&P 500® Index $1,000,000,000 $1,127,571,059 $1,040,427,377 $1,351,318,995 $1,462,825,686 $1,723,259,443 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year Life of Fund A Premier Class 22.20% 8.14% Fidelity Freedom 2050 Composite Index℠ 19.07% 7.84% S&P 500® Index 17.80% 11.53% A From April 6, 2021 Visit www.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Apr. 06, 2021 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 3,689,428,934 | $ 3,689,428,934 | $ 3,689,428,934 | $ 3,689,428,934 | $ 3,689,428,934 | |||||||||||||||
| Holdings Count | shares | 41 | 41 | 41 | 41 | 41 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 9,358,090 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 16.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Domestic Equity Funds 55.0 International Equity Funds 40.8 Bond Funds 3.9 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 55.0 International Equity Funds - 40.8 Bond Funds - 3.9 Short-Term Investments and Net Other Assets (Liabilities) - 0.3 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 15.3 Fidelity Series Blue Chip Growth Fund 12.9 Fidelity Series Emerging Markets Opportunities Fund 10.4 Fidelity Series Large Cap Growth Index Fund 8.2 Fidelity Series Large Cap Stock Fund 8.0 Fidelity Series Overseas Fund 6.7 Fidelity Series International Value Fund 6.7 Fidelity Series International Growth Fund 6.7 Fidelity Series Value Discovery Fund 5.4 Fidelity Series Canada Fund 4.0 84.3 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
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| Material Fund Change Expenses [Text Block] | The fees associated with this class changed during the reporting year. The variations in class fees are primarily the result of the following changes:
The fund's contractual management fee was reduced during the reporting period.
Effective June 1, 2025, the fund's expense contract was amended to reduce its total expenses.
|
|||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-3455</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Freedom Blend 2040 Fund - Class K6 | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2040 Fund | |||||||||||||||||||
| Class Name | Fidelity Freedom® Blend 2040 Fund Class K6 | |||||||||||||||||||
| Trading Symbol | FHHDX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2040 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-835-5092 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 30 | |||||||||||||||||||
| Expense Ratio, Percent | 0.27% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Class K6 $10,000 $9,886 $8,890 $13,878 $14,359 $13,356 $16,050 $16,960 $20,434 Fidelity Freedom 2040 Composite Index℠ $10,000 $9,871 $9,004 $13,506 $14,229 $13,178 $15,712 $16,727 $19,689 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class K6 20.48% 8.04% 9.88% Fidelity Freedom 2040 Composite Index℠ 17.71% 7.83% 9.35% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit www.401k.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.401k.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 4,622,181,262 | $ 4,622,181,262 | $ 4,622,181,262 | $ 4,622,181,262 | $ 4,622,181,262 | |||||||||||||||
| Holdings Count | shares | 48 | 48 | 48 | 48 | 48 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 11,983,334 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 18.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
|||||||||||||||||||
| Holdings [Text Block] | Domestic Equity Funds 48.6 International Equity Funds 36.7 Bond Funds 14.3 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 48.6 International Equity Funds - 36.7 Bond Funds - 14.3 Short-Term Investments and Net Other Assets (Liabilities) - 0.4 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 13.5 Fidelity Series Blue Chip Growth Fund 11.4 Fidelity Series Emerging Markets Opportunities Fund 9.4 Fidelity Series Large Cap Growth Index Fund 7.2 Fidelity Series Large Cap Stock Fund 7.1 Fidelity Series Overseas Fund 6.0 Fidelity Series International Value Fund 6.0 Fidelity Series International Growth Fund 6.0 Fidelity Series Value Discovery Fund 4.8 Fidelity Series Long-Term Treasury Bond Index Fund 4.2 75.6 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
|||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period.
Effective June 1, 2025, the fund's expense contract was amended to reduce its total expenses.
|
|||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-835-5092</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Freedom Blend 2055 Fund - Class K | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2055 Fund | |||||||||||||||||||
| Class Name | Fidelity Freedom® Blend 2055 Fund Class K | |||||||||||||||||||
| Trading Symbol | FHVDX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2055 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-835-5092 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 41 | |||||||||||||||||||
| Expense Ratio, Percent | 0.37% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Class K $10,000 $9,877 $8,873 $13,834 $14,309 $13,307 $16,106 $16,989 $20,720 Fidelity Freedom 2055 Composite Index℠ $10,000 $9,871 $9,004 $13,506 $14,232 $13,186 $15,842 $16,880 $20,092 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class K 21.96% 8.41% 10.08% Fidelity Freedom 2055 Composite Index℠ 19.03% 8.27% 9.64% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit www.401k.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.401k.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 2,613,990,291 | $ 2,613,990,291 | $ 2,613,990,291 | $ 2,613,990,291 | $ 2,613,990,291 | |||||||||||||||
| Holdings Count | shares | 42 | 42 | 42 | 42 | 42 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 6,592,844 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 15.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
|||||||||||||||||||
| Holdings [Text Block] | Domestic Equity Funds 55.8 International Equity Funds 41.3 Bond Funds 2.5 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 55.8 International Equity Funds - 41.3 Bond Funds - 2.5 Short-Term Investments and Net Other Assets (Liabilities) - 0.4 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 15.5 Fidelity Series Blue Chip Growth Fund 13.1 Fidelity Series Emerging Markets Opportunities Fund 10.5 Fidelity Series Large Cap Growth Index Fund 8.3 Fidelity Series Large Cap Stock Fund 8.2 Fidelity Series International Value Fund 6.8 Fidelity Series Overseas Fund 6.8 Fidelity Series International Growth Fund 6.8 Fidelity Series Value Discovery Fund 5.5 Fidelity Series Canada Fund 4.1 85.6 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
|||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The fees associated with this class changed during the reporting year. The variations in class fees are primarily the result of the following changes:
The fund's contractual management fee was reduced during the reporting period.
|
|||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-835-5092</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2010 Fund - Class C | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2010 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2010 Fund Class C | |||||||||||||||||||
| Trading Symbol | FJAYX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2010 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 147 | |||||||||||||||||||
| Expense Ratio, Percent | 1.41% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Class C $10,000 $10,081 $9,922 $11,812 $11,648 $10,926 $11,592 $12,075 $13,045 Fidelity Freedom 2010 Composite Index℠ $10,000 $10,147 $10,290 $12,077 $12,146 $11,556 $12,434 $13,135 $14,196 Bloomberg U.S. Aggregate Bond Index $10,000 $10,395 $11,324 $11,404 $10,931 $10,408 $10,585 $11,101 $11,584 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class C (incl. contingent deferred sales charge) 7.03% 2.01% 3.57% Class C 8.03% 2.01% 3.57% Fidelity Freedom 2010 Composite Index℠ 8.08% 3.28% 4.73% Bloomberg U.S. Aggregate Bond Index 4.35% 0.31% 1.96% A From August 31, 2018 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 203,748,419 | $ 203,748,419 | $ 203,748,419 | $ 203,748,419 | $ 203,748,419 | |||||||||||||||
| Holdings Count | shares | 46 | 46 | 46 | 46 | 46 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 441,074 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 28.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Bond Funds 59.4 Domestic Equity Funds 17.9 International Equity Funds 16.0 Short-Term Funds 6.5 Short-Term Investments and Net Other Assets (Liabilities) 0.2 ASSET ALLOCATION (% of Fund's net assets) Bond Funds - 59.4 Domestic Equity Funds - 17.9 International Equity Funds - 16.0 Short-Term Funds - 6.5 Short-Term Investments and Net Other Assets (Liabilities) - 0.2 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 17.8 Fidelity Series Government Bond Index Fund 10.4 Fidelity Series Investment Grade Bond Fund 9.7 Fidelity Series Corporate Bond Fund 6.2 Fidelity Series Investment Grade Securitized Fund 5.8 Fidelity Series International Developed Markets Bond Index Fund 4.8 Fidelity Series Large Cap Value Index Fund 4.6 Fidelity Series Emerging Markets Opportunities Fund 4.2 Fidelity Series Blue Chip Growth Fund 3.9 Fidelity Series Treasury Bill Index Fund 3.8 71.2 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
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| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
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| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2040 Fund - Class A | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2040 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2040 Fund Class A | |||||||||||||||||||
| Trading Symbol | FHDEX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2040 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 79 | |||||||||||||||||||
| Expense Ratio, Percent | 0.72% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000 and the current sales charge was paid. Class A $9,425 $9,294 $8,311 $12,928 $13,312 $12,330 $14,752 $15,517 $18,608 Fidelity Freedom 2040 Composite Index℠ $10,000 $9,871 $9,004 $13,506 $14,229 $13,178 $15,712 $16,727 $19,689 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class A (incl. 5.75% sales charge) 13.02% 6.29% 8.53% Class A (without 5.75% sales charge) 19.92% 7.56% 9.38% Fidelity Freedom 2040 Composite Index℠ 17.71% 7.83% 9.35% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 4,622,181,262 | $ 4,622,181,262 | $ 4,622,181,262 | $ 4,622,181,262 | $ 4,622,181,262 | |||||||||||||||
| Holdings Count | shares | 48 | 48 | 48 | 48 | 48 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 11,983,334 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 18.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
|||||||||||||||||||
| Holdings [Text Block] | Domestic Equity Funds 48.6 International Equity Funds 36.7 Bond Funds 14.3 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 48.6 International Equity Funds - 36.7 Bond Funds - 14.3 Short-Term Investments and Net Other Assets (Liabilities) - 0.4 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 13.5 Fidelity Series Blue Chip Growth Fund 11.4 Fidelity Series Emerging Markets Opportunities Fund 9.4 Fidelity Series Large Cap Growth Index Fund 7.2 Fidelity Series Large Cap Stock Fund 7.1 Fidelity Series Overseas Fund 6.0 Fidelity Series International Value Fund 6.0 Fidelity Series International Growth Fund 6.0 Fidelity Series Value Discovery Fund 4.8 Fidelity Series Long-Term Treasury Bond Index Fund 4.2 75.6 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
|||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Freedom Blend 2035 Fund - Premier Class | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2035 Fund | |||||||||||||||||||
| Class Name | Fidelity Freedom® Blend 2035 Fund Premier Class | |||||||||||||||||||
| Trading Symbol | FFBRX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2035 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-544-3455 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 22 | |||||||||||||||||||
| Expense Ratio, Percent | 0.20% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE April 6, 2021 through March 31, 2026. Initial investment of $1,000,000,000. Premier Class $1,000,000,000 $1,006,450,796 $939,010,012 $1,099,024,598 $1,159,916,382 $1,362,232,963 Fidelity Freedom 2035 Composite Index℠ $1,000,000,000 $1,021,979,150 $949,435,446 $1,104,524,139 $1,172,536,505 $1,349,529,954 S&P 500® Index $1,000,000,000 $1,127,571,059 $1,040,427,377 $1,351,318,995 $1,462,825,686 $1,723,259,443 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year Life of Fund A Premier Class 17.44% 6.40% Fidelity Freedom 2035 Composite Index℠ 15.09% 6.20% S&P 500® Index 17.80% 11.53% A From April 6, 2021 Visit www.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Apr. 06, 2021 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 4,774,644,697 | $ 4,774,644,697 | $ 4,774,644,697 | $ 4,774,644,697 | $ 4,774,644,697 | |||||||||||||||
| Holdings Count | shares | 48 | 48 | 48 | 48 | 48 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 12,522,295 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 18.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
|||||||||||||||||||
| Holdings [Text Block] | Domestic Equity Funds 39.8 International Equity Funds 30.9 Bond Funds 28.9 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 39.8 International Equity Funds - 30.9 Bond Funds - 28.9 Short-Term Investments and Net Other Assets (Liabilities) - 0.4 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 11.0 Fidelity Series Blue Chip Growth Fund 9.2 Fidelity Series Emerging Markets Opportunities Fund 7.9 Fidelity Series Large Cap Growth Index Fund 5.9 Fidelity Series Large Cap Stock Fund 5.8 Fidelity Series Government Bond Index Fund 5.4 Fidelity Series Investment Grade Bond Fund 5.2 Fidelity Series Overseas Fund 5.0 Fidelity Series International Value Fund 5.0 Fidelity Series International Growth Fund 5.0 65.4 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
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| Material Fund Change Expenses [Text Block] | The fees associated with this class changed during the reporting year. The variations in class fees are primarily the result of the following changes:
The fund's contractual management fee was reduced during the reporting period.
Effective June 1, 2025, the fund's expense contract was amended to reduce its total expenses.
|
|||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-3455</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2045 Fund - Class A | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2045 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2045 Fund Class A | |||||||||||||||||||
| Trading Symbol | FHGFX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2045 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 80 | |||||||||||||||||||
| Expense Ratio, Percent | 0.72% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000 and the current sales charge was paid. Class A $9,425 $9,278 $8,315 $12,913 $13,303 $12,336 $14,876 $15,642 $19,020 Fidelity Freedom 2045 Composite Index℠ $10,000 $9,871 $9,004 $13,506 $14,232 $13,186 $15,842 $16,880 $20,107 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class A (incl. 5.75% sales charge) 14.60% 6.78% 8.85% Class A (without 5.75% sales charge) 21.59% 8.05% 9.70% Fidelity Freedom 2045 Composite Index℠ 19.12% 8.28% 9.65% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 4,169,922,346 | $ 4,169,922,346 | $ 4,169,922,346 | $ 4,169,922,346 | $ 4,169,922,346 | |||||||||||||||
| Holdings Count | shares | 41 | 41 | 41 | 41 | 41 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 10,616,108 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 16.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Domestic Equity Funds 54.1 International Equity Funds 40.2 Bond Funds 5.3 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 54.1 International Equity Funds - 40.2 Bond Funds - 5.3 Short-Term Investments and Net Other Assets (Liabilities) - 0.4 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 15.0 Fidelity Series Blue Chip Growth Fund 12.7 Fidelity Series Emerging Markets Opportunities Fund 10.3 Fidelity Series Large Cap Growth Index Fund 8.1 Fidelity Series Large Cap Stock Fund 7.9 Fidelity Series International Value Fund 6.6 Fidelity Series Overseas Fund 6.6 Fidelity Series International Growth Fund 6.6 Fidelity Series Value Discovery Fund 5.4 Fidelity Series Canada Fund 4.0 83.2 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
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| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
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| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2010 Fund - Class I | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2010 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2010 Fund Class I | |||||||||||||||||||
| Trading Symbol | FJAWX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2010 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
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| Expenses Paid, Amount | $ 43 | |||||||||||||||||||
| Expense Ratio, Percent | 0.41% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Class I $10,000 $10,135 $10,081 $12,122 $12,068 $11,436 $12,253 $12,901 $14,072 Fidelity Freedom 2010 Composite Index℠ $10,000 $10,147 $10,290 $12,077 $12,146 $11,556 $12,434 $13,135 $14,196 Bloomberg U.S. Aggregate Bond Index $10,000 $10,395 $11,324 $11,404 $10,931 $10,408 $10,585 $11,101 $11,584 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class I 9.07% 3.03% 4.61% Fidelity Freedom 2010 Composite Index℠ 8.08% 3.28% 4.73% Bloomberg U.S. Aggregate Bond Index 4.35% 0.31% 1.96% A From August 31, 2018 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 203,748,419 | $ 203,748,419 | $ 203,748,419 | $ 203,748,419 | $ 203,748,419 | |||||||||||||||
| Holdings Count | shares | 46 | 46 | 46 | 46 | 46 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 441,074 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 28.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Bond Funds 59.4 Domestic Equity Funds 17.9 International Equity Funds 16.0 Short-Term Funds 6.5 Short-Term Investments and Net Other Assets (Liabilities) 0.2 ASSET ALLOCATION (% of Fund's net assets) Bond Funds - 59.4 Domestic Equity Funds - 17.9 International Equity Funds - 16.0 Short-Term Funds - 6.5 Short-Term Investments and Net Other Assets (Liabilities) - 0.2 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 17.8 Fidelity Series Government Bond Index Fund 10.4 Fidelity Series Investment Grade Bond Fund 9.7 Fidelity Series Corporate Bond Fund 6.2 Fidelity Series Investment Grade Securitized Fund 5.8 Fidelity Series International Developed Markets Bond Index Fund 4.8 Fidelity Series Large Cap Value Index Fund 4.6 Fidelity Series Emerging Markets Opportunities Fund 4.2 Fidelity Series Blue Chip Growth Fund 3.9 Fidelity Series Treasury Bill Index Fund 3.8 71.2 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
|||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2045 Fund - Class M | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2045 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2045 Fund Class M | |||||||||||||||||||
| Trading Symbol | FHEFX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2045 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 108 | |||||||||||||||||||
| Expense Ratio, Percent | 0.97% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000 and the current sales charge was paid. Class M $9,650 $9,488 $8,472 $13,134 $13,499 $12,480 $15,020 $15,756 $19,106 Fidelity Freedom 2045 Composite Index℠ $10,000 $9,871 $9,004 $13,506 $14,232 $13,186 $15,842 $16,880 $20,107 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class M (incl. 3.50% sales charge) 17.01% 7.02% 8.91% Class M (without 3.50% sales charge) 21.26% 7.78% 9.43% Fidelity Freedom 2045 Composite Index℠ 19.12% 8.28% 9.65% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 4,169,922,346 | $ 4,169,922,346 | $ 4,169,922,346 | $ 4,169,922,346 | $ 4,169,922,346 | |||||||||||||||
| Holdings Count | shares | 41 | 41 | 41 | 41 | 41 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 10,616,108 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 16.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
|||||||||||||||||||
| Holdings [Text Block] | Domestic Equity Funds 54.1 International Equity Funds 40.2 Bond Funds 5.3 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 54.1 International Equity Funds - 40.2 Bond Funds - 5.3 Short-Term Investments and Net Other Assets (Liabilities) - 0.4 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 15.0 Fidelity Series Blue Chip Growth Fund 12.7 Fidelity Series Emerging Markets Opportunities Fund 10.3 Fidelity Series Large Cap Growth Index Fund 8.1 Fidelity Series Large Cap Stock Fund 7.9 Fidelity Series International Value Fund 6.6 Fidelity Series Overseas Fund 6.6 Fidelity Series International Growth Fund 6.6 Fidelity Series Value Discovery Fund 5.4 Fidelity Series Canada Fund 4.0 83.2 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
|||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Freedom Blend 2050 Fund - Class K | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2050 Fund | |||||||||||||||||||
| Class Name | Fidelity Freedom® Blend 2050 Fund Class K | |||||||||||||||||||
| Trading Symbol | FHWDX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2050 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-835-5092 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 41 | |||||||||||||||||||
| Expense Ratio, Percent | 0.37% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Class K $10,000 $9,872 $8,868 $13,829 $14,303 $13,290 $16,093 $16,985 $20,711 Fidelity Freedom 2050 Composite Index℠ $10,000 $9,871 $9,004 $13,506 $14,232 $13,186 $15,842 $16,880 $20,099 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class K 21.94% 8.41% 10.08% Fidelity Freedom 2050 Composite Index℠ 19.07% 8.27% 9.64% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit www.401k.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.401k.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 3,689,428,934 | $ 3,689,428,934 | $ 3,689,428,934 | $ 3,689,428,934 | $ 3,689,428,934 | |||||||||||||||
| Holdings Count | shares | 41 | 41 | 41 | 41 | 41 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 9,358,090 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 16.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
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| Holdings [Text Block] | Domestic Equity Funds 55.0 International Equity Funds 40.8 Bond Funds 3.9 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 55.0 International Equity Funds - 40.8 Bond Funds - 3.9 Short-Term Investments and Net Other Assets (Liabilities) - 0.3 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 15.3 Fidelity Series Blue Chip Growth Fund 12.9 Fidelity Series Emerging Markets Opportunities Fund 10.4 Fidelity Series Large Cap Growth Index Fund 8.2 Fidelity Series Large Cap Stock Fund 8.0 Fidelity Series Overseas Fund 6.7 Fidelity Series International Value Fund 6.7 Fidelity Series International Growth Fund 6.7 Fidelity Series Value Discovery Fund 5.4 Fidelity Series Canada Fund 4.0 84.3 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com.
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| Material Fund Change Expenses [Text Block] | The fees associated with this class changed during the reporting year. The variations in class fees are primarily the result of the following changes:
The fund's contractual management fee was reduced during the reporting period.
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| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
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| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-835-5092</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Freedom Blend 2025 Fund - Class K6 | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2025 Fund | |||||||||||||||||||
| Class Name | Fidelity Freedom® Blend 2025 Fund Class K6 | |||||||||||||||||||
| Trading Symbol | FHLDX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2025 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-835-5092 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
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| Expenses Paid, Amount | $ 26 | |||||||||||||||||||
| Expense Ratio, Percent | 0.24% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
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| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Class K6 $10,000 $10,060 $9,629 $12,986 $13,122 $12,244 $13,759 $14,499 $16,567 Fidelity Freedom 2025 Composite Index℠ $10,000 $10,043 $9,773 $12,764 $13,051 $12,167 $13,642 $14,434 $16,215 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class K6 14.26% 4.99% 6.88% Fidelity Freedom 2025 Composite Index℠ 12.34% 4.90% 6.58% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit www.401k.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.401k.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 2,514,301,835 | $ 2,514,301,835 | $ 2,514,301,835 | $ 2,514,301,835 | $ 2,514,301,835 | |||||||||||||||
| Holdings Count | shares | 47 | 47 | 47 | 47 | 47 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 6,931,716 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 27.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Bond Funds 43.4 Domestic Equity Funds 31.1 International Equity Funds 25.2 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) Bond Funds - 43.4 Domestic Equity Funds - 31.1 International Equity Funds - 25.2 Short-Term Investments and Net Other Assets (Liabilities) - 0.3 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 8.9 Fidelity Series Large Cap Value Index Fund 8.6 Fidelity Series Government Bond Index Fund 7.8 Fidelity Series Investment Grade Bond Fund 7.2 Fidelity Series Blue Chip Growth Fund 7.2 Fidelity Series Emerging Markets Opportunities Fund 6.5 Fidelity Series International Developed Markets Bond Index Fund 4.8 Fidelity Series Corporate Bond Fund 4.7 Fidelity Series Large Cap Growth Index Fund 4.6 Fidelity Series Large Cap Stock Fund 4.5 64.8 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
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| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period.
Effective June 1, 2025, the fund's expense contract was amended to reduce its total expenses.
|
|||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-835-5092</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Freedom Blend 2020 Fund - Class K6 | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2020 Fund | |||||||||||||||||||
| Class Name | Fidelity Freedom® Blend 2020 Fund Class K6 | |||||||||||||||||||
| Trading Symbol | FHNDX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2020 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-835-5092 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 24 | |||||||||||||||||||
| Expense Ratio, Percent | 0.23% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Class K6 $10,000 $10,077 $9,753 $12,766 $12,853 $12,023 $13,326 $14,042 $15,830 Fidelity Freedom 2020 Composite Index℠ $10,000 $10,073 $9,915 $12,584 $12,802 $11,972 $13,254 $14,017 $15,570 Bloomberg U.S. Aggregate Bond Index $10,000 $10,395 $11,324 $11,404 $10,931 $10,408 $10,585 $11,101 $11,584 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class K6 12.74% 4.40% 6.24% Fidelity Freedom 2020 Composite Index℠ 11.08% 4.35% 6.01% Bloomberg U.S. Aggregate Bond Index 4.35% 0.31% 1.96% A From August 31, 2018 Visit www.401k.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.401k.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 1,276,372,296 | $ 1,276,372,296 | $ 1,276,372,296 | $ 1,276,372,296 | $ 1,276,372,296 | |||||||||||||||
| Holdings Count | shares | 49 | 49 | 49 | 49 | 49 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 3,260,714 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 30.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Bond Funds 49.2 Domestic Equity Funds 26.6 International Equity Funds 21.8 Short-Term Funds 2.1 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) Bond Funds - 49.2 Domestic Equity Funds - 26.6 International Equity Funds - 21.8 Short-Term Funds - 2.1 Short-Term Investments and Net Other Assets (Liabilities) - 0.3 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Government Bond Index Fund 9.0 Fidelity Series Investment Grade Bond Fund 8.3 Fidelity Series Large Cap Value Index Fund 7.1 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 6.5 Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 6.2 Fidelity Series Blue Chip Growth Fund 6.0 Fidelity Series Emerging Markets Opportunities Fund 5.7 Fidelity Series Corporate Bond Fund 5.4 Fidelity Series Investment Grade Securitized Fund 5.1 Fidelity Series International Developed Markets Bond Index Fund 4.8 64.1 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
|||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period.
Effective June 1, 2025, the fund's expense contract was amended to reduce its total expenses.
|
|||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-835-5092</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Freedom Blend 2065 Fund - Class K | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2065 Fund | |||||||||||||||||||
| Class Name | Fidelity Freedom® Blend 2065 Fund Class K | |||||||||||||||||||
| Trading Symbol | FFBKX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2065 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-835-5092 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
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| Expenses Paid, Amount | $ 41 | |||||||||||||||||||
| Expense Ratio, Percent | 0.37% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE June 28, 2019 through March 31, 2026. Initial investment of $10,000. Class K $10,000 $8,670 $13,524 $13,993 $13,019 $15,744 $16,606 $20,264 Fidelity Freedom 2065 Composite Index℠ $10,000 $8,783 $13,174 $13,882 $12,862 $15,453 $16,465 $19,597 S&P 500® Index $10,000 $8,918 $13,944 $16,126 $14,879 $19,326 $20,920 $24,645 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class K 22.03% 8.42% 11.03% Fidelity Freedom 2065 Composite Index℠ 19.02% 8.27% 10.48% S&P 500® Index 17.80% 12.06% 14.30% A From June 28, 2019 Visit www.401k.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Jun. 28, 2019 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.401k.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 560,851,778 | $ 560,851,778 | $ 560,851,778 | $ 560,851,778 | $ 560,851,778 | |||||||||||||||
| Holdings Count | shares | 42 | 42 | 42 | 42 | 42 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 1,336,669 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 16.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Domestic Equity Funds 55.9 International Equity Funds 41.4 Bond Funds 2.3 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 55.9 International Equity Funds - 41.4 Bond Funds - 2.3 Short-Term Investments and Net Other Assets (Liabilities) - 0.4 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 15.6 Fidelity Series Blue Chip Growth Fund 13.1 Fidelity Series Emerging Markets Opportunities Fund 10.6 Fidelity Series Large Cap Growth Index Fund 8.3 Fidelity Series Large Cap Stock Fund 8.2 Fidelity Series International Value Fund 6.8 Fidelity Series Overseas Fund 6.8 Fidelity Series International Growth Fund 6.8 Fidelity Series Value Discovery Fund 5.6 Fidelity Series Canada Fund 4.1 85.9 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
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| Material Fund Change Expenses [Text Block] | The fees associated with this class changed during the reporting year. The variations in class fees are primarily the result of the following changes:
The fund's contractual management fee was reduced during the reporting period.
The fund's contractual proxy and shareholder meeting expense cap expired during the reporting period.
|
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| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
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| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-835-5092</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2055 Fund - Class C | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2055 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2055 Fund Class C | |||||||||||||||||||
| Trading Symbol | FHREX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2055 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
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| Expenses Paid, Amount | $ 163 | |||||||||||||||||||
| Expense Ratio, Percent | 1.48% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
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| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Class C $10,000 $9,807 $8,716 $13,443 $13,754 $12,646 $15,140 $15,806 $19,056 Fidelity Freedom 2055 Composite Index℠ $10,000 $9,871 $9,004 $13,506 $14,232 $13,186 $15,842 $16,880 $20,092 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class C (incl. contingent deferred sales charge) 19.57% 7.23% 8.87% Class C 20.57% 7.23% 8.87% Fidelity Freedom 2055 Composite Index℠ 19.03% 8.27% 9.64% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 2,613,990,291 | $ 2,613,990,291 | $ 2,613,990,291 | $ 2,613,990,291 | $ 2,613,990,291 | |||||||||||||||
| Holdings Count | shares | 42 | 42 | 42 | 42 | 42 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 6,592,844 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 15.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Domestic Equity Funds 55.8 International Equity Funds 41.3 Bond Funds 2.5 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 55.8 International Equity Funds - 41.3 Bond Funds - 2.5 Short-Term Investments and Net Other Assets (Liabilities) - 0.4 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 15.5 Fidelity Series Blue Chip Growth Fund 13.1 Fidelity Series Emerging Markets Opportunities Fund 10.5 Fidelity Series Large Cap Growth Index Fund 8.3 Fidelity Series Large Cap Stock Fund 8.2 Fidelity Series International Value Fund 6.8 Fidelity Series Overseas Fund 6.8 Fidelity Series International Growth Fund 6.8 Fidelity Series Value Discovery Fund 5.5 Fidelity Series Canada Fund 4.1 85.6 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
|||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Freedom Blend 2030 Fund | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2030 Fund | |||||||||||||||||||
| Class Name | Fidelity Freedom® Blend 2030 Fund | |||||||||||||||||||
| Trading Symbol | FHATX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2030 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-544-8544 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 50 | |||||||||||||||||||
| Expense Ratio, Percent | 0.46% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Fidelity Freedom® Blend 2030 Fund $10,000 $9,974 $9,382 $13,150 $13,329 $12,417 $14,134 $14,859 $17,143 Fidelity Freedom 2030 Composite Index℠ $10,000 $9,983 $9,554 $12,953 $13,325 $12,423 $14,120 $14,955 $16,973 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Fidelity Freedom® Blend 2030 Fund 15.37% 5.45% 7.37% Fidelity Freedom 2030 Composite Index℠ 13.50% 5.55% 7.23% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit www.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 4,347,223,120 | $ 4,347,223,120 | $ 4,347,223,120 | $ 4,347,223,120 | $ 4,347,223,120 | |||||||||||||||
| Holdings Count | shares | 48 | 48 | 48 | 48 | 48 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 11,303,201 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 20.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Bond Funds 37.0 Domestic Equity Funds 34.9 International Equity Funds 27.8 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) Bond Funds - 37.0 Domestic Equity Funds - 34.9 International Equity Funds - 27.8 Short-Term Investments and Net Other Assets (Liabilities) - 0.3 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 9.6 Fidelity Series Blue Chip Growth Fund 8.2 Fidelity Series Emerging Markets Opportunities Fund 7.1 Fidelity Series Government Bond Index Fund 6.8 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 6.4 Fidelity Series Investment Grade Bond Fund 6.3 Fidelity Series Large Cap Growth Index Fund 5.2 Fidelity Series Large Cap Stock Fund 5.1 Fidelity Series International Developed Markets Bond Index Fund 4.7 Fidelity Series Overseas Fund 4.4 63.8 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
|||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-8544</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2050 Fund - Class Z | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2050 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2050 Fund Class Z | |||||||||||||||||||
| Trading Symbol | FHVEX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2050 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
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| Expenses Paid, Amount | $ 41 | |||||||||||||||||||
| Expense Ratio, Percent | 0.37% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Class Z $10,000 $9,872 $8,861 $13,830 $14,300 $13,289 $16,093 $16,988 $20,708 Fidelity Freedom 2050 Composite Index℠ $10,000 $9,871 $9,004 $13,506 $14,232 $13,186 $15,842 $16,880 $20,099 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class Z 21.90% 8.41% 10.07% Fidelity Freedom 2050 Composite Index℠ 19.07% 8.27% 9.64% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 3,689,428,934 | $ 3,689,428,934 | $ 3,689,428,934 | $ 3,689,428,934 | $ 3,689,428,934 | |||||||||||||||
| Holdings Count | shares | 41 | 41 | 41 | 41 | 41 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 9,358,090 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 16.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
|||||||||||||||||||
| Holdings [Text Block] | Domestic Equity Funds 55.0 International Equity Funds 40.8 Bond Funds 3.9 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 55.0 International Equity Funds - 40.8 Bond Funds - 3.9 Short-Term Investments and Net Other Assets (Liabilities) - 0.3 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 15.3 Fidelity Series Blue Chip Growth Fund 12.9 Fidelity Series Emerging Markets Opportunities Fund 10.4 Fidelity Series Large Cap Growth Index Fund 8.2 Fidelity Series Large Cap Stock Fund 8.0 Fidelity Series Overseas Fund 6.7 Fidelity Series International Value Fund 6.7 Fidelity Series International Growth Fund 6.7 Fidelity Series Value Discovery Fund 5.4 Fidelity Series Canada Fund 4.0 84.3 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
|||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The fees associated with this class changed during the reporting year. The variations in class fees are primarily the result of the following changes:
The fund's contractual management fee was reduced during the reporting period.
|
|||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2055 Fund - Class I | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2055 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2055 Fund Class I | |||||||||||||||||||
| Trading Symbol | FHQEX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2055 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 52 | |||||||||||||||||||
| Expense Ratio, Percent | 0.47% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Class I $10,000 $9,873 $8,854 $13,798 $14,256 $13,249 $16,019 $16,886 $20,567 Fidelity Freedom 2055 Composite Index℠ $10,000 $9,871 $9,004 $13,506 $14,232 $13,186 $15,842 $16,880 $20,092 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class I 21.80% 8.31% 9.98% Fidelity Freedom 2055 Composite Index℠ 19.03% 8.27% 9.64% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 2,613,990,291 | $ 2,613,990,291 | $ 2,613,990,291 | $ 2,613,990,291 | $ 2,613,990,291 | |||||||||||||||
| Holdings Count | shares | 42 | 42 | 42 | 42 | 42 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 6,592,844 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 15.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Domestic Equity Funds 55.8 International Equity Funds 41.3 Bond Funds 2.5 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 55.8 International Equity Funds - 41.3 Bond Funds - 2.5 Short-Term Investments and Net Other Assets (Liabilities) - 0.4 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 15.5 Fidelity Series Blue Chip Growth Fund 13.1 Fidelity Series Emerging Markets Opportunities Fund 10.5 Fidelity Series Large Cap Growth Index Fund 8.3 Fidelity Series Large Cap Stock Fund 8.2 Fidelity Series International Value Fund 6.8 Fidelity Series Overseas Fund 6.8 Fidelity Series International Growth Fund 6.8 Fidelity Series Value Discovery Fund 5.5 Fidelity Series Canada Fund 4.1 85.6 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
|||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2030 Fund - Class I | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2030 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2030 Fund Class I | |||||||||||||||||||
| Trading Symbol | FJEFX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2030 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 50 | |||||||||||||||||||
| Expense Ratio, Percent | 0.46% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Class I $10,000 $9,971 $9,380 $13,150 $13,327 $12,415 $14,135 $14,867 $17,147 Fidelity Freedom 2030 Composite Index℠ $10,000 $9,983 $9,554 $12,953 $13,325 $12,423 $14,120 $14,955 $16,973 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class I 15.33% 5.45% 7.37% Fidelity Freedom 2030 Composite Index℠ 13.50% 5.55% 7.23% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 4,347,223,120 | $ 4,347,223,120 | $ 4,347,223,120 | $ 4,347,223,120 | $ 4,347,223,120 | |||||||||||||||
| Holdings Count | shares | 48 | 48 | 48 | 48 | 48 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 11,303,201 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 20.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
|||||||||||||||||||
| Holdings [Text Block] | Bond Funds 37.0 Domestic Equity Funds 34.9 International Equity Funds 27.8 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) Bond Funds - 37.0 Domestic Equity Funds - 34.9 International Equity Funds - 27.8 Short-Term Investments and Net Other Assets (Liabilities) - 0.3 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 9.6 Fidelity Series Blue Chip Growth Fund 8.2 Fidelity Series Emerging Markets Opportunities Fund 7.1 Fidelity Series Government Bond Index Fund 6.8 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 6.4 Fidelity Series Investment Grade Bond Fund 6.3 Fidelity Series Large Cap Growth Index Fund 5.2 Fidelity Series Large Cap Stock Fund 5.1 Fidelity Series International Developed Markets Bond Index Fund 4.7 Fidelity Series Overseas Fund 4.4 63.8 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
|||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2050 Fund - Class A | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2050 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2050 Fund Class A | |||||||||||||||||||
| Trading Symbol | FHJKX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2050 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 80 | |||||||||||||||||||
| Expense Ratio, Percent | 0.72% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000 and the current sales charge was paid. Class A $9,425 $9,284 $8,310 $12,917 $13,301 $12,335 $14,878 $15,642 $19,016 Fidelity Freedom 2050 Composite Index℠ $10,000 $9,871 $9,004 $13,506 $14,232 $13,186 $15,842 $16,880 $20,099 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class A (incl. 5.75% sales charge) 14.58% 6.77% 8.84% Class A (without 5.75% sales charge) 21.57% 8.04% 9.70% Fidelity Freedom 2050 Composite Index℠ 19.07% 8.27% 9.64% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 3,689,428,934 | $ 3,689,428,934 | $ 3,689,428,934 | $ 3,689,428,934 | $ 3,689,428,934 | |||||||||||||||
| Holdings Count | shares | 41 | 41 | 41 | 41 | 41 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 9,358,090 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 16.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
|||||||||||||||||||
| Holdings [Text Block] | Domestic Equity Funds 55.0 International Equity Funds 40.8 Bond Funds 3.9 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 55.0 International Equity Funds - 40.8 Bond Funds - 3.9 Short-Term Investments and Net Other Assets (Liabilities) - 0.3 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 15.3 Fidelity Series Blue Chip Growth Fund 12.9 Fidelity Series Emerging Markets Opportunities Fund 10.4 Fidelity Series Large Cap Growth Index Fund 8.2 Fidelity Series Large Cap Stock Fund 8.0 Fidelity Series Overseas Fund 6.7 Fidelity Series International Value Fund 6.7 Fidelity Series International Growth Fund 6.7 Fidelity Series Value Discovery Fund 5.4 Fidelity Series Canada Fund 4.0 84.3 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
|||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2030 Fund - Class C | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2030 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2030 Fund Class C | |||||||||||||||||||
| Trading Symbol | FJTMX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2030 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 157 | |||||||||||||||||||
| Expense Ratio, Percent | 1.46% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Class C $10,000 $9,919 $9,231 $12,808 $12,853 $11,860 $13,373 $13,915 $15,899 Fidelity Freedom 2030 Composite Index℠ $10,000 $9,983 $9,554 $12,953 $13,325 $12,423 $14,120 $14,955 $16,973 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class C (incl. contingent deferred sales charge) 13.26% 4.42% 6.31% Class C 14.26% 4.42% 6.31% Fidelity Freedom 2030 Composite Index℠ 13.50% 5.55% 7.23% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 4,347,223,120 | $ 4,347,223,120 | $ 4,347,223,120 | $ 4,347,223,120 | $ 4,347,223,120 | |||||||||||||||
| Holdings Count | shares | 48 | 48 | 48 | 48 | 48 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 11,303,201 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 20.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Bond Funds 37.0 Domestic Equity Funds 34.9 International Equity Funds 27.8 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) Bond Funds - 37.0 Domestic Equity Funds - 34.9 International Equity Funds - 27.8 Short-Term Investments and Net Other Assets (Liabilities) - 0.3 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 9.6 Fidelity Series Blue Chip Growth Fund 8.2 Fidelity Series Emerging Markets Opportunities Fund 7.1 Fidelity Series Government Bond Index Fund 6.8 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 6.4 Fidelity Series Investment Grade Bond Fund 6.3 Fidelity Series Large Cap Growth Index Fund 5.2 Fidelity Series Large Cap Stock Fund 5.1 Fidelity Series International Developed Markets Bond Index Fund 4.7 Fidelity Series Overseas Fund 4.4 63.8 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
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| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2070 Fund - Class I | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2070 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2070 Fund Class I | |||||||||||||||||||
| Trading Symbol | FRCLX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2070 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 52 | |||||||||||||||||||
| Expense Ratio, Percent | 0.47% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE June 28, 2024 through March 31, 2026. Initial investment of $10,000. Class I $10,000 $10,344 $12,560 Fidelity Freedom 2070 Composite Index℠ $10,000 $10,441 $12,428 S&P 500® Index $10,000 $10,380 $12,229 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year Life of Fund A Class I 21.43% 13.91% Fidelity Freedom 2070 Composite Index℠ 19.02% 13.22% S&P 500® Index 17.80% 12.18% A From June 28, 2024 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Jun. 28, 2024 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 47,210,850 | $ 47,210,850 | $ 47,210,850 | $ 47,210,850 | $ 47,210,850 | |||||||||||||||
| Holdings Count | shares | 22 | 22 | 22 | 22 | 22 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 75,991 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 28.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
|||||||||||||||||||
| Holdings [Text Block] | Domestic Equity Funds 53.0 International Equity Funds 42.3 Bond Funds 4.6 Short-Term Investments and Net Other Assets (Liabilities) 0.1 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 53.0 International Equity Funds - 42.3 Bond Funds - 4.6 Short-Term Investments and Net Other Assets (Liabilities) - 0.1 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 14.8 Fidelity Series Blue Chip Growth Fund 12.5 Fidelity Series Emerging Markets Opportunities Fund 10.7 Fidelity Series Large Cap Growth Index Fund 8.0 Fidelity Series Large Cap Stock Fund 7.8 Fidelity Series International Value Fund 7.1 Fidelity Series Overseas Fund 7.1 Fidelity Series International Growth Fund 7.1 Fidelity Series Value Discovery Fund 5.4 Fidelity Series Long-Term Treasury Bond Index Fund 4.6 85.1 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
|||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2045 Fund - Class I | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2045 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2045 Fund Class I | |||||||||||||||||||
| Trading Symbol | FHCFX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2045 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 53 | |||||||||||||||||||
| Expense Ratio, Percent | 0.47% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Class I $10,000 $9,862 $8,858 $13,795 $14,248 $13,237 $16,015 $16,874 $20,567 Fidelity Freedom 2045 Composite Index℠ $10,000 $9,871 $9,004 $13,506 $14,232 $13,186 $15,842 $16,880 $20,107 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class I 21.89% 8.31% 9.98% Fidelity Freedom 2045 Composite Index℠ 19.12% 8.28% 9.65% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 4,169,922,346 | $ 4,169,922,346 | $ 4,169,922,346 | $ 4,169,922,346 | $ 4,169,922,346 | |||||||||||||||
| Holdings Count | shares | 41 | 41 | 41 | 41 | 41 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 10,616,108 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 16.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
|||||||||||||||||||
| Holdings [Text Block] | Domestic Equity Funds 54.1 International Equity Funds 40.2 Bond Funds 5.3 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 54.1 International Equity Funds - 40.2 Bond Funds - 5.3 Short-Term Investments and Net Other Assets (Liabilities) - 0.4 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 15.0 Fidelity Series Blue Chip Growth Fund 12.7 Fidelity Series Emerging Markets Opportunities Fund 10.3 Fidelity Series Large Cap Growth Index Fund 8.1 Fidelity Series Large Cap Stock Fund 7.9 Fidelity Series International Value Fund 6.6 Fidelity Series Overseas Fund 6.6 Fidelity Series International Growth Fund 6.6 Fidelity Series Value Discovery Fund 5.4 Fidelity Series Canada Fund 4.0 83.2 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
|||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Freedom Blend 2010 Fund - Premier Class | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2010 Fund | |||||||||||||||||||
| Class Name | Fidelity Freedom® Blend 2010 Fund Premier Class | |||||||||||||||||||
| Trading Symbol | FFBHX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2010 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-544-3455 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 18 | |||||||||||||||||||
| Expense Ratio, Percent | 0.17% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE April 6, 2021 through March 31, 2026. Initial investment of $1,000,000,000. Premier Class $1,000,000,000 $987,724,421 $938,405,919 $1,007,412,211 $1,062,884,059 $1,162,774,418 Fidelity Freedom 2010 Composite Index℠ $1,000,000,000 $995,730,213 $947,416,539 $1,019,345,215 $1,076,807,392 $1,163,788,020 Bloomberg U.S. Aggregate Bond Index $1,000,000,000 $953,978,249 $908,346,598 $923,769,592 $968,845,888 $1,010,976,620 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year Life of Fund A Premier Class 9.40% 3.07% Fidelity Freedom 2010 Composite Index℠ 8.08% 3.09% Bloomberg U.S. Aggregate Bond Index 4.35% 0.22% A From April 6, 2021 Visit www.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Apr. 06, 2021 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 203,748,419 | $ 203,748,419 | $ 203,748,419 | $ 203,748,419 | $ 203,748,419 | |||||||||||||||
| Holdings Count | shares | 46 | 46 | 46 | 46 | 46 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 441,074 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 28.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
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| Holdings [Text Block] | Bond Funds 59.4 Domestic Equity Funds 17.9 International Equity Funds 16.0 Short-Term Funds 6.5 Short-Term Investments and Net Other Assets (Liabilities) 0.2 ASSET ALLOCATION (% of Fund's net assets) Bond Funds - 59.4 Domestic Equity Funds - 17.9 International Equity Funds - 16.0 Short-Term Funds - 6.5 Short-Term Investments and Net Other Assets (Liabilities) - 0.2 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 17.8 Fidelity Series Government Bond Index Fund 10.4 Fidelity Series Investment Grade Bond Fund 9.7 Fidelity Series Corporate Bond Fund 6.2 Fidelity Series Investment Grade Securitized Fund 5.8 Fidelity Series International Developed Markets Bond Index Fund 4.8 Fidelity Series Large Cap Value Index Fund 4.6 Fidelity Series Emerging Markets Opportunities Fund 4.2 Fidelity Series Blue Chip Growth Fund 3.9 Fidelity Series Treasury Bill Index Fund 3.8 71.2 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com.
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| Material Fund Change Expenses [Text Block] | The fees associated with this class changed during the reporting year. The variations in class fees are primarily the result of the following changes:
The fund's contractual management fee was reduced during the reporting period.
Effective June 1, 2025, the fund's expense contract was amended to reduce its total expenses.
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| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
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| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-3455</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Freedom Blend 2010 Fund | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2010 Fund | |||||||||||||||||||
| Class Name | Fidelity Freedom® Blend 2010 Fund | |||||||||||||||||||
| Trading Symbol | FHAYX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2010 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-544-8544 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
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| Expenses Paid, Amount | $ 43 | |||||||||||||||||||
| Expense Ratio, Percent | 0.41% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
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| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Fidelity Freedom® Blend 2010 Fund $10,000 $10,137 $10,080 $12,124 $12,073 $11,432 $12,254 $12,901 $14,079 Fidelity Freedom 2010 Composite Index℠ $10,000 $10,147 $10,290 $12,077 $12,146 $11,556 $12,434 $13,135 $14,196 Bloomberg U.S. Aggregate Bond Index $10,000 $10,395 $11,324 $11,404 $10,931 $10,408 $10,585 $11,101 $11,584 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Fidelity Freedom® Blend 2010 Fund 9.14% 3.04% 4.61% Fidelity Freedom 2010 Composite Index℠ 8.08% 3.28% 4.73% Bloomberg U.S. Aggregate Bond Index 4.35% 0.31% 1.96% A From August 31, 2018 Visit www.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 203,748,419 | $ 203,748,419 | $ 203,748,419 | $ 203,748,419 | $ 203,748,419 | |||||||||||||||
| Holdings Count | shares | 46 | 46 | 46 | 46 | 46 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 441,074 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 28.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Bond Funds 59.4 Domestic Equity Funds 17.9 International Equity Funds 16.0 Short-Term Funds 6.5 Short-Term Investments and Net Other Assets (Liabilities) 0.2 ASSET ALLOCATION (% of Fund's net assets) Bond Funds - 59.4 Domestic Equity Funds - 17.9 International Equity Funds - 16.0 Short-Term Funds - 6.5 Short-Term Investments and Net Other Assets (Liabilities) - 0.2 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 17.8 Fidelity Series Government Bond Index Fund 10.4 Fidelity Series Investment Grade Bond Fund 9.7 Fidelity Series Corporate Bond Fund 6.2 Fidelity Series Investment Grade Securitized Fund 5.8 Fidelity Series International Developed Markets Bond Index Fund 4.8 Fidelity Series Large Cap Value Index Fund 4.6 Fidelity Series Emerging Markets Opportunities Fund 4.2 Fidelity Series Blue Chip Growth Fund 3.9 Fidelity Series Treasury Bill Index Fund 3.8 71.2 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
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| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-8544</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Freedom Blend 2020 Fund - Premier Class | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2020 Fund | |||||||||||||||||||
| Class Name | Fidelity Freedom® Blend 2020 Fund Premier Class | |||||||||||||||||||
| Trading Symbol | FFBLX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2020 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-544-3455 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 20 | |||||||||||||||||||
| Expense Ratio, Percent | 0.18% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
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| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE April 6, 2021 through March 31, 2026. Initial investment of $1,000,000,000. Premier Class $1,000,000,000 $993,083,991 $929,076,701 $1,029,235,418 $1,084,912,117 $1,223,883,563 Fidelity Freedom 2020 Composite Index℠ $1,000,000,000 $1,003,570,704 $938,474,776 $1,038,976,976 $1,098,827,110 $1,220,541,074 Bloomberg U.S. Aggregate Bond Index $1,000,000,000 $953,978,249 $908,346,598 $923,769,592 $968,845,888 $1,010,976,620 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year Life of Fund A Premier Class 12.81% 4.13% Fidelity Freedom 2020 Composite Index℠ 11.08% 4.08% Bloomberg U.S. Aggregate Bond Index 4.35% 0.22% A From April 6, 2021 Visit www.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Apr. 06, 2021 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 1,276,372,296 | $ 1,276,372,296 | $ 1,276,372,296 | $ 1,276,372,296 | $ 1,276,372,296 | |||||||||||||||
| Holdings Count | shares | 49 | 49 | 49 | 49 | 49 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 3,260,714 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 30.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Bond Funds 49.2 Domestic Equity Funds 26.6 International Equity Funds 21.8 Short-Term Funds 2.1 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) Bond Funds - 49.2 Domestic Equity Funds - 26.6 International Equity Funds - 21.8 Short-Term Funds - 2.1 Short-Term Investments and Net Other Assets (Liabilities) - 0.3 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Government Bond Index Fund 9.0 Fidelity Series Investment Grade Bond Fund 8.3 Fidelity Series Large Cap Value Index Fund 7.1 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 6.5 Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 6.2 Fidelity Series Blue Chip Growth Fund 6.0 Fidelity Series Emerging Markets Opportunities Fund 5.7 Fidelity Series Corporate Bond Fund 5.4 Fidelity Series Investment Grade Securitized Fund 5.1 Fidelity Series International Developed Markets Bond Index Fund 4.8 64.1 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
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| Material Fund Change Expenses [Text Block] | The fees associated with this class changed during the reporting year. The variations in class fees are primarily the result of the following changes:
The fund's contractual management fee was reduced during the reporting period.
Effective June 1, 2025, the fund's expense contract was amended to reduce its total expenses.
|
|||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
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| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-3455</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2015 Fund - Class M | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2015 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2015 Fund Class M | |||||||||||||||||||
| Trading Symbol | FJATX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2015 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
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| Expenses Paid, Amount | $ 97 | |||||||||||||||||||
| Expense Ratio, Percent | 0.92% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
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| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000 and the current sales charge was paid. Class M $9,650 $9,714 $9,472 $11,826 $11,778 $11,014 $11,937 $12,498 $13,778 Fidelity Freedom 2015 Composite Index℠ $10,000 $10,107 $10,092 $12,336 $12,479 $11,773 $12,850 $13,583 $14,886 Bloomberg U.S. Aggregate Bond Index $10,000 $10,395 $11,324 $11,404 $10,931 $10,408 $10,585 $11,101 $11,584 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class M (incl. 3.50% sales charge) 6.39% 2.37% 4.32% Class M (without 3.50% sales charge) 10.25% 3.10% 4.81% Fidelity Freedom 2015 Composite Index℠ 9.59% 3.83% 5.39% Bloomberg U.S. Aggregate Bond Index 4.35% 0.31% 1.96% A From August 31, 2018 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 332,449,887 | $ 332,449,887 | $ 332,449,887 | $ 332,449,887 | $ 332,449,887 | |||||||||||||||
| Holdings Count | shares | 45 | 45 | 45 | 45 | 45 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 950,396 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 25.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Bond Funds 54.3 Domestic Equity Funds 22.1 International Equity Funds 18.6 Short-Term Funds 4.7 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) Bond Funds - 54.3 Domestic Equity Funds - 22.1 International Equity Funds - 18.6 Short-Term Funds - 4.7 Short-Term Investments and Net Other Assets (Liabilities) - 0.3 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 11.7 Fidelity Series Government Bond Index Fund 9.8 Fidelity Series Investment Grade Bond Fund 9.1 Fidelity Series Corporate Bond Fund 5.9 Fidelity Series Large Cap Value Index Fund 5.8 Fidelity Series Investment Grade Securitized Fund 5.5 Fidelity Series Blue Chip Growth Fund 4.9 Fidelity Series Emerging Markets Opportunities Fund 4.9 Fidelity Series International Developed Markets Bond Index Fund 4.8 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 3.9 66.3 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
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| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2050 Fund - Class C | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2050 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2050 Fund Class C | |||||||||||||||||||
| Trading Symbol | FHXEX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2050 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 163 | |||||||||||||||||||
| Expense Ratio, Percent | 1.48% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Class C $10,000 $9,811 $8,710 $13,432 $13,748 $12,640 $15,132 $15,797 $19,055 Fidelity Freedom 2050 Composite Index℠ $10,000 $9,871 $9,004 $13,506 $14,232 $13,186 $15,842 $16,880 $20,099 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class C (incl. contingent deferred sales charge) 19.62% 7.24% 8.87% Class C 20.62% 7.24% 8.87% Fidelity Freedom 2050 Composite Index℠ 19.07% 8.27% 9.64% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 3,689,428,934 | $ 3,689,428,934 | $ 3,689,428,934 | $ 3,689,428,934 | $ 3,689,428,934 | |||||||||||||||
| Holdings Count | shares | 41 | 41 | 41 | 41 | 41 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 9,358,090 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 16.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
|||||||||||||||||||
| Holdings [Text Block] | Domestic Equity Funds 55.0 International Equity Funds 40.8 Bond Funds 3.9 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 55.0 International Equity Funds - 40.8 Bond Funds - 3.9 Short-Term Investments and Net Other Assets (Liabilities) - 0.3 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 15.3 Fidelity Series Blue Chip Growth Fund 12.9 Fidelity Series Emerging Markets Opportunities Fund 10.4 Fidelity Series Large Cap Growth Index Fund 8.2 Fidelity Series Large Cap Stock Fund 8.0 Fidelity Series Overseas Fund 6.7 Fidelity Series International Value Fund 6.7 Fidelity Series International Growth Fund 6.7 Fidelity Series Value Discovery Fund 5.4 Fidelity Series Canada Fund 4.0 84.3 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
|||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Freedom Blend 2050 Fund | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2050 Fund | |||||||||||||||||||
| Class Name | Fidelity Freedom® Blend 2050 Fund | |||||||||||||||||||
| Trading Symbol | FHAPX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2050 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-544-8544 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 53 | |||||||||||||||||||
| Expense Ratio, Percent | 0.47% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Fidelity Freedom® Blend 2050 Fund $10,000 $9,861 $8,846 $13,793 $14,247 $13,228 $16,010 $16,870 $20,551 Fidelity Freedom 2050 Composite Index℠ $10,000 $9,871 $9,004 $13,506 $14,232 $13,186 $15,842 $16,880 $20,099 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Fidelity Freedom® Blend 2050 Fund 21.82% 8.30% 9.96% Fidelity Freedom 2050 Composite Index℠ 19.07% 8.27% 9.64% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit www.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 3,689,428,934 | $ 3,689,428,934 | $ 3,689,428,934 | $ 3,689,428,934 | $ 3,689,428,934 | |||||||||||||||
| Holdings Count | shares | 41 | 41 | 41 | 41 | 41 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 9,358,090 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 16.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
|||||||||||||||||||
| Holdings [Text Block] | Domestic Equity Funds 55.0 International Equity Funds 40.8 Bond Funds 3.9 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 55.0 International Equity Funds - 40.8 Bond Funds - 3.9 Short-Term Investments and Net Other Assets (Liabilities) - 0.3 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 15.3 Fidelity Series Blue Chip Growth Fund 12.9 Fidelity Series Emerging Markets Opportunities Fund 10.4 Fidelity Series Large Cap Growth Index Fund 8.2 Fidelity Series Large Cap Stock Fund 8.0 Fidelity Series Overseas Fund 6.7 Fidelity Series International Value Fund 6.7 Fidelity Series International Growth Fund 6.7 Fidelity Series Value Discovery Fund 5.4 Fidelity Series Canada Fund 4.0 84.3 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
|||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-8544</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2020 Fund - Class M | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2020 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2020 Fund Class M | |||||||||||||||||||
| Trading Symbol | FJANX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2020 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 99 | |||||||||||||||||||
| Expense Ratio, Percent | 0.93% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000 and the current sales charge was paid. Class M $9,650 $9,681 $9,303 $12,107 $12,098 $11,235 $12,358 $12,942 $14,488 Fidelity Freedom 2020 Composite Index℠ $10,000 $10,073 $9,915 $12,584 $12,802 $11,972 $13,254 $14,017 $15,570 Bloomberg U.S. Aggregate Bond Index $10,000 $10,395 $11,324 $11,404 $10,931 $10,408 $10,585 $11,101 $11,584 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class M (incl. 3.50% sales charge) 8.03% 2.92% 5.01% Class M (without 3.50% sales charge) 11.95% 3.66% 5.50% Fidelity Freedom 2020 Composite Index℠ 11.08% 4.35% 6.01% Bloomberg U.S. Aggregate Bond Index 4.35% 0.31% 1.96% A From August 31, 2018 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 1,276,372,296 | $ 1,276,372,296 | $ 1,276,372,296 | $ 1,276,372,296 | $ 1,276,372,296 | |||||||||||||||
| Holdings Count | shares | 49 | 49 | 49 | 49 | 49 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 3,260,714 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 30.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
|||||||||||||||||||
| Holdings [Text Block] | Bond Funds 49.2 Domestic Equity Funds 26.6 International Equity Funds 21.8 Short-Term Funds 2.1 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) Bond Funds - 49.2 Domestic Equity Funds - 26.6 International Equity Funds - 21.8 Short-Term Funds - 2.1 Short-Term Investments and Net Other Assets (Liabilities) - 0.3 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Government Bond Index Fund 9.0 Fidelity Series Investment Grade Bond Fund 8.3 Fidelity Series Large Cap Value Index Fund 7.1 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 6.5 Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 6.2 Fidelity Series Blue Chip Growth Fund 6.0 Fidelity Series Emerging Markets Opportunities Fund 5.7 Fidelity Series Corporate Bond Fund 5.4 Fidelity Series Investment Grade Securitized Fund 5.1 Fidelity Series International Developed Markets Bond Index Fund 4.8 64.1 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
|||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
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| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Freedom Blend 2045 Fund - Premier Class | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2045 Fund | |||||||||||||||||||
| Class Name | Fidelity Freedom® Blend 2045 Fund Premier Class | |||||||||||||||||||
| Trading Symbol | FFBUX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2045 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-544-3455 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 23 | |||||||||||||||||||
| Expense Ratio, Percent | 0.21% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE April 6, 2021 through March 31, 2026. Initial investment of $1,000,000,000. Premier Class $1,000,000,000 $1,013,208,062 $943,303,067 $1,144,260,691 $1,208,874,656 $1,477,175,758 Fidelity Freedom 2045 Composite Index℠ $1,000,000,000 $1,031,497,482 $955,734,871 $1,148,236,910 $1,223,433,008 $1,457,331,376 S&P 500® Index $1,000,000,000 $1,127,571,059 $1,040,427,377 $1,351,318,995 $1,462,825,686 $1,723,259,443 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year Life of Fund A Premier Class 22.19% 8.14% Fidelity Freedom 2045 Composite Index℠ 19.12% 7.85% S&P 500® Index 17.80% 11.53% A From April 6, 2021 Visit www.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Apr. 06, 2021 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 4,169,922,346 | $ 4,169,922,346 | $ 4,169,922,346 | $ 4,169,922,346 | $ 4,169,922,346 | |||||||||||||||
| Holdings Count | shares | 41 | 41 | 41 | 41 | 41 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 10,616,108 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 16.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Domestic Equity Funds 54.1 International Equity Funds 40.2 Bond Funds 5.3 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 54.1 International Equity Funds - 40.2 Bond Funds - 5.3 Short-Term Investments and Net Other Assets (Liabilities) - 0.4 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 15.0 Fidelity Series Blue Chip Growth Fund 12.7 Fidelity Series Emerging Markets Opportunities Fund 10.3 Fidelity Series Large Cap Growth Index Fund 8.1 Fidelity Series Large Cap Stock Fund 7.9 Fidelity Series International Value Fund 6.6 Fidelity Series Overseas Fund 6.6 Fidelity Series International Growth Fund 6.6 Fidelity Series Value Discovery Fund 5.4 Fidelity Series Canada Fund 4.0 83.2 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
|||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The fees associated with this class changed during the reporting year. The variations in class fees are primarily the result of the following changes:
The fund's contractual management fee was reduced during the reporting period.
Effective June 1, 2025, the fund's expense contract was amended to reduce its total expenses.
|
|||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-3455</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Freedom Blend 2045 Fund - Class K6 | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2045 Fund | |||||||||||||||||||
| Class Name | Fidelity Freedom® Blend 2045 Fund Class K6 | |||||||||||||||||||
| Trading Symbol | FHFDX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2045 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-835-5092 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 30 | |||||||||||||||||||
| Expense Ratio, Percent | 0.27% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Class K6 $10,000 $9,879 $8,881 $13,865 $14,352 $13,361 $16,196 $17,102 $20,893 Fidelity Freedom 2045 Composite Index℠ $10,000 $9,871 $9,004 $13,506 $14,232 $13,186 $15,842 $16,880 $20,107 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class K6 22.17% 8.55% 10.20% Fidelity Freedom 2045 Composite Index℠ 19.12% 8.28% 9.65% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit www.401k.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.401k.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 4,169,922,346 | $ 4,169,922,346 | $ 4,169,922,346 | $ 4,169,922,346 | $ 4,169,922,346 | |||||||||||||||
| Holdings Count | shares | 41 | 41 | 41 | 41 | 41 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 10,616,108 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 16.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
|||||||||||||||||||
| Holdings [Text Block] | Domestic Equity Funds 54.1 International Equity Funds 40.2 Bond Funds 5.3 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 54.1 International Equity Funds - 40.2 Bond Funds - 5.3 Short-Term Investments and Net Other Assets (Liabilities) - 0.4 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 15.0 Fidelity Series Blue Chip Growth Fund 12.7 Fidelity Series Emerging Markets Opportunities Fund 10.3 Fidelity Series Large Cap Growth Index Fund 8.1 Fidelity Series Large Cap Stock Fund 7.9 Fidelity Series International Value Fund 6.6 Fidelity Series Overseas Fund 6.6 Fidelity Series International Growth Fund 6.6 Fidelity Series Value Discovery Fund 5.4 Fidelity Series Canada Fund 4.0 83.2 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
|||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The fees associated with this class changed during the reporting year. The variations in class fees are primarily the result of the following changes:
The fund's contractual management fee was reduced during the reporting period.
Effective June 1, 2025, the fund's expense contract was amended to reduce its total expenses.
|
|||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-835-5092</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Freedom Blend 2025 Fund - Premier Class | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2025 Fund | |||||||||||||||||||
| Class Name | Fidelity Freedom® Blend 2025 Fund Premier Class | |||||||||||||||||||
| Trading Symbol | FFBNX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2025 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-544-3455 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 21 | |||||||||||||||||||
| Expense Ratio, Percent | 0.19% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE April 6, 2021 through March 31, 2026. Initial investment of $1,000,000,000. Premier Class $1,000,000,000 $995,651,184 $929,242,504 $1,044,611,715 $1,100,226,931 $1,258,095,580 Fidelity Freedom 2025 Composite Index℠ $1,000,000,000 $1,007,265,552 $939,047,637 $1,052,839,636 $1,113,960,406 $1,251,461,489 S&P 500® Index $1,000,000,000 $1,127,571,059 $1,040,427,377 $1,351,318,995 $1,462,825,686 $1,723,259,443 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year Life of Fund A Premier Class 14.35% 4.71% Fidelity Freedom 2025 Composite Index℠ 12.34% 4.60% S&P 500® Index 17.80% 11.53% A From April 6, 2021 Visit www.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Apr. 06, 2021 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 2,514,301,835 | $ 2,514,301,835 | $ 2,514,301,835 | $ 2,514,301,835 | $ 2,514,301,835 | |||||||||||||||
| Holdings Count | shares | 47 | 47 | 47 | 47 | 47 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 6,931,716 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 27.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
|||||||||||||||||||
| Holdings [Text Block] | Bond Funds 43.4 Domestic Equity Funds 31.1 International Equity Funds 25.2 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) Bond Funds - 43.4 Domestic Equity Funds - 31.1 International Equity Funds - 25.2 Short-Term Investments and Net Other Assets (Liabilities) - 0.3 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 8.9 Fidelity Series Large Cap Value Index Fund 8.6 Fidelity Series Government Bond Index Fund 7.8 Fidelity Series Investment Grade Bond Fund 7.2 Fidelity Series Blue Chip Growth Fund 7.2 Fidelity Series Emerging Markets Opportunities Fund 6.5 Fidelity Series International Developed Markets Bond Index Fund 4.8 Fidelity Series Corporate Bond Fund 4.7 Fidelity Series Large Cap Growth Index Fund 4.6 Fidelity Series Large Cap Stock Fund 4.5 64.8 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
|||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The fees associated with this class changed during the reporting year. The variations in class fees are primarily the result of the following changes:
The fund's contractual management fee was reduced during the reporting period.
Effective June 1, 2025, the fund's expense contract was amended to reduce its total expenses.
|
|||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-3455</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2040 Fund - Class C | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2040 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2040 Fund Class C | |||||||||||||||||||
| Trading Symbol | FHZEX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2040 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
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| Expenses Paid, Amount | $ 161 | |||||||||||||||||||
| Expense Ratio, Percent | 1.47% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
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| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Class C $10,000 $9,812 $8,723 $13,453 $13,747 $12,641 $15,017 $15,673 $18,648 Fidelity Freedom 2040 Composite Index℠ $10,000 $9,871 $9,004 $13,506 $14,229 $13,178 $15,712 $16,727 $19,689 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class C (incl. contingent deferred sales charge) 17.98% 6.75% 8.56% Class C 18.98% 6.75% 8.56% Fidelity Freedom 2040 Composite Index℠ 17.71% 7.83% 9.35% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 4,622,181,262 | $ 4,622,181,262 | $ 4,622,181,262 | $ 4,622,181,262 | $ 4,622,181,262 | |||||||||||||||
| Holdings Count | shares | 48 | 48 | 48 | 48 | 48 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 11,983,334 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 18.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
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| Holdings [Text Block] | Domestic Equity Funds 48.6 International Equity Funds 36.7 Bond Funds 14.3 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 48.6 International Equity Funds - 36.7 Bond Funds - 14.3 Short-Term Investments and Net Other Assets (Liabilities) - 0.4 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 13.5 Fidelity Series Blue Chip Growth Fund 11.4 Fidelity Series Emerging Markets Opportunities Fund 9.4 Fidelity Series Large Cap Growth Index Fund 7.2 Fidelity Series Large Cap Stock Fund 7.1 Fidelity Series Overseas Fund 6.0 Fidelity Series International Value Fund 6.0 Fidelity Series International Growth Fund 6.0 Fidelity Series Value Discovery Fund 4.8 Fidelity Series Long-Term Treasury Bond Index Fund 4.2 75.6 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
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| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
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| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2020 Fund - Class I | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2020 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2020 Fund Class I | |||||||||||||||||||
| Trading Symbol | FJAJX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2020 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
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| Expenses Paid, Amount | $ 46 | |||||||||||||||||||
| Expense Ratio, Percent | 0.43% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Class I $10,000 $10,069 $9,717 $12,701 $12,766 $11,908 $13,169 $13,851 $15,581 Fidelity Freedom 2020 Composite Index℠ $10,000 $10,073 $9,915 $12,584 $12,802 $11,972 $13,254 $14,017 $15,570 Bloomberg U.S. Aggregate Bond Index $10,000 $10,395 $11,324 $11,404 $10,931 $10,408 $10,585 $11,101 $11,584 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class I 12.49% 4.17% 6.02% Fidelity Freedom 2020 Composite Index℠ 11.08% 4.35% 6.01% Bloomberg U.S. Aggregate Bond Index 4.35% 0.31% 1.96% A From August 31, 2018 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 1,276,372,296 | $ 1,276,372,296 | $ 1,276,372,296 | $ 1,276,372,296 | $ 1,276,372,296 | |||||||||||||||
| Holdings Count | shares | 49 | 49 | 49 | 49 | 49 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 3,260,714 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 30.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Bond Funds 49.2 Domestic Equity Funds 26.6 International Equity Funds 21.8 Short-Term Funds 2.1 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) Bond Funds - 49.2 Domestic Equity Funds - 26.6 International Equity Funds - 21.8 Short-Term Funds - 2.1 Short-Term Investments and Net Other Assets (Liabilities) - 0.3 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Government Bond Index Fund 9.0 Fidelity Series Investment Grade Bond Fund 8.3 Fidelity Series Large Cap Value Index Fund 7.1 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 6.5 Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 6.2 Fidelity Series Blue Chip Growth Fund 6.0 Fidelity Series Emerging Markets Opportunities Fund 5.7 Fidelity Series Corporate Bond Fund 5.4 Fidelity Series Investment Grade Securitized Fund 5.1 Fidelity Series International Developed Markets Bond Index Fund 4.8 64.1 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
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| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2035 Fund - Class I | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2035 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2035 Fund Class I | |||||||||||||||||||
| Trading Symbol | FHGDX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2035 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
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| Expenses Paid, Amount | $ 51 | |||||||||||||||||||
| Expense Ratio, Percent | 0.47% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Class I $10,000 $9,899 $9,048 $13,542 $13,876 $12,901 $15,078 $15,863 $18,599 Fidelity Freedom 2035 Composite Index℠ $10,000 $9,897 $9,181 $13,259 $13,817 $12,836 $14,933 $15,853 $18,246 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class I 17.25% 6.55% 8.53% Fidelity Freedom 2035 Composite Index℠ 15.09% 6.59% 8.25% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 4,774,644,697 | $ 4,774,644,697 | $ 4,774,644,697 | $ 4,774,644,697 | $ 4,774,644,697 | |||||||||||||||
| Holdings Count | shares | 48 | 48 | 48 | 48 | 48 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 12,522,295 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 18.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Domestic Equity Funds 39.8 International Equity Funds 30.9 Bond Funds 28.9 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 39.8 International Equity Funds - 30.9 Bond Funds - 28.9 Short-Term Investments and Net Other Assets (Liabilities) - 0.4 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 11.0 Fidelity Series Blue Chip Growth Fund 9.2 Fidelity Series Emerging Markets Opportunities Fund 7.9 Fidelity Series Large Cap Growth Index Fund 5.9 Fidelity Series Large Cap Stock Fund 5.8 Fidelity Series Government Bond Index Fund 5.4 Fidelity Series Investment Grade Bond Fund 5.2 Fidelity Series Overseas Fund 5.0 Fidelity Series International Value Fund 5.0 Fidelity Series International Growth Fund 5.0 65.4 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
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| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2070 Fund - Class C | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2070 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2070 Fund Class C | |||||||||||||||||||
| Trading Symbol | FRCKX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2070 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
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| Expenses Paid, Amount | $ 163 | |||||||||||||||||||
| Expense Ratio, Percent | 1.48% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE June 28, 2024 through March 31, 2026. Initial investment of $10,000. Class C $10,000 $10,265 $12,338 Fidelity Freedom 2070 Composite Index℠ $10,000 $10,441 $12,428 S&P 500® Index $10,000 $10,380 $12,229 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year Life of Fund A Class C (incl. contingent deferred sales charge) 19.19% 12.76% Class C 20.19% 12.76% Fidelity Freedom 2070 Composite Index℠ 19.02% 13.22% S&P 500® Index 17.80% 12.18% A From June 28, 2024 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Jun. 28, 2024 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 47,210,850 | $ 47,210,850 | $ 47,210,850 | $ 47,210,850 | $ 47,210,850 | |||||||||||||||
| Holdings Count | shares | 22 | 22 | 22 | 22 | 22 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 75,991 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 28.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
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| Holdings [Text Block] | Domestic Equity Funds 53.0 International Equity Funds 42.3 Bond Funds 4.6 Short-Term Investments and Net Other Assets (Liabilities) 0.1 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 53.0 International Equity Funds - 42.3 Bond Funds - 4.6 Short-Term Investments and Net Other Assets (Liabilities) - 0.1 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 14.8 Fidelity Series Blue Chip Growth Fund 12.5 Fidelity Series Emerging Markets Opportunities Fund 10.7 Fidelity Series Large Cap Growth Index Fund 8.0 Fidelity Series Large Cap Stock Fund 7.8 Fidelity Series International Value Fund 7.1 Fidelity Series Overseas Fund 7.1 Fidelity Series International Growth Fund 7.1 Fidelity Series Value Discovery Fund 5.4 Fidelity Series Long-Term Treasury Bond Index Fund 4.6 85.1 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
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| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
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| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Freedom Blend 2065 Fund | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2065 Fund | |||||||||||||||||||
| Class Name | Fidelity Freedom® Blend 2065 Fund | |||||||||||||||||||
| Trading Symbol | FFBSX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2065 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-544-8544 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
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| Expenses Paid, Amount | $ 52 | |||||||||||||||||||
| Expense Ratio, Percent | 0.47% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE June 28, 2019 through March 31, 2026. Initial investment of $10,000. Fidelity Freedom® Blend 2065 Fund $10,000 $8,672 $13,502 $13,953 $12,969 $15,676 $16,523 $20,129 Fidelity Freedom 2065 Composite Index℠ $10,000 $8,783 $13,174 $13,882 $12,862 $15,453 $16,465 $19,597 S&P 500® Index $10,000 $8,918 $13,944 $16,126 $14,879 $19,326 $20,920 $24,645 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Fidelity Freedom® Blend 2065 Fund 21.82% 8.31% 10.92% Fidelity Freedom 2065 Composite Index℠ 19.02% 8.27% 10.48% S&P 500® Index 17.80% 12.06% 14.30% A From June 28, 2019 Visit www.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Jun. 28, 2019 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 560,851,778 | $ 560,851,778 | $ 560,851,778 | $ 560,851,778 | $ 560,851,778 | |||||||||||||||
| Holdings Count | shares | 42 | 42 | 42 | 42 | 42 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 1,336,669 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 16.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Domestic Equity Funds 55.9 International Equity Funds 41.4 Bond Funds 2.3 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 55.9 International Equity Funds - 41.4 Bond Funds - 2.3 Short-Term Investments and Net Other Assets (Liabilities) - 0.4 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 15.6 Fidelity Series Blue Chip Growth Fund 13.1 Fidelity Series Emerging Markets Opportunities Fund 10.6 Fidelity Series Large Cap Growth Index Fund 8.3 Fidelity Series Large Cap Stock Fund 8.2 Fidelity Series International Value Fund 6.8 Fidelity Series Overseas Fund 6.8 Fidelity Series International Growth Fund 6.8 Fidelity Series Value Discovery Fund 5.6 Fidelity Series Canada Fund 4.1 85.9 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
|||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period.
The fund's contractual proxy and shareholder meeting expense cap expired during the reporting period.
|
|||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-8544</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Freedom Blend 2010 Fund - Class K | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2010 Fund | |||||||||||||||||||
| Class Name | Fidelity Freedom® Blend 2010 Fund Class K | |||||||||||||||||||
| Trading Symbol | FHFEX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2010 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-835-5092 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 32 | |||||||||||||||||||
| Expense Ratio, Percent | 0.31% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Class K $10,000 $10,138 $10,095 $12,154 $12,120 $11,490 $12,321 $12,984 $14,184 Fidelity Freedom 2010 Composite Index℠ $10,000 $10,147 $10,290 $12,077 $12,146 $11,556 $12,434 $13,135 $14,196 Bloomberg U.S. Aggregate Bond Index $10,000 $10,395 $11,324 $11,404 $10,931 $10,408 $10,585 $11,101 $11,584 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class K 9.24% 3.14% 4.72% Fidelity Freedom 2010 Composite Index℠ 8.08% 3.28% 4.73% Bloomberg U.S. Aggregate Bond Index 4.35% 0.31% 1.96% A From August 31, 2018 Visit www.401k.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.401k.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 203,748,419 | $ 203,748,419 | $ 203,748,419 | $ 203,748,419 | $ 203,748,419 | |||||||||||||||
| Holdings Count | shares | 46 | 46 | 46 | 46 | 46 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 441,074 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 28.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Bond Funds 59.4 Domestic Equity Funds 17.9 International Equity Funds 16.0 Short-Term Funds 6.5 Short-Term Investments and Net Other Assets (Liabilities) 0.2 ASSET ALLOCATION (% of Fund's net assets) Bond Funds - 59.4 Domestic Equity Funds - 17.9 International Equity Funds - 16.0 Short-Term Funds - 6.5 Short-Term Investments and Net Other Assets (Liabilities) - 0.2 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 17.8 Fidelity Series Government Bond Index Fund 10.4 Fidelity Series Investment Grade Bond Fund 9.7 Fidelity Series Corporate Bond Fund 6.2 Fidelity Series Investment Grade Securitized Fund 5.8 Fidelity Series International Developed Markets Bond Index Fund 4.8 Fidelity Series Large Cap Value Index Fund 4.6 Fidelity Series Emerging Markets Opportunities Fund 4.2 Fidelity Series Blue Chip Growth Fund 3.9 Fidelity Series Treasury Bill Index Fund 3.8 71.2 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
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| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-835-5092</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Freedom Blend Retirement Fund - Class Z | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend Retirement Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend Retirement Fund Class Z | |||||||||||||||||||
| Trading Symbol | FHAHX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend Retirement Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 32 | |||||||||||||||||||
| Expense Ratio, Percent | 0.31% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Class Z $10,000 $10,220 $10,410 $11,702 $11,588 $11,097 $11,719 $12,343 $13,356 Fidelity Freedom Retirement Composite Index℠ $10,000 $10,223 $10,623 $11,687 $11,652 $11,208 $11,896 $12,555 $13,448 Bloomberg U.S. Aggregate Bond Index $10,000 $10,395 $11,324 $11,404 $10,931 $10,408 $10,585 $11,101 $11,584 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class Z 8.21% 2.68% 3.89% Fidelity Freedom Retirement Composite Index℠ 7.11% 2.85% 3.98% Bloomberg U.S. Aggregate Bond Index 4.35% 0.31% 1.96% A From August 31, 2018 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 217,536,466 | $ 217,536,466 | $ 217,536,466 | $ 217,536,466 | $ 217,536,466 | |||||||||||||||
| Holdings Count | shares | 47 | 47 | 47 | 47 | 47 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 491,972 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 38.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Bond Funds 61.3 Domestic Equity Funds 16.3 International Equity Funds 14.7 Short-Term Funds 7.4 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) Bond Funds - 61.3 Domestic Equity Funds - 16.3 International Equity Funds - 14.7 Short-Term Funds - 7.4 Short-Term Investments and Net Other Assets (Liabilities) - 0.3 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 20.4 Fidelity Series Government Bond Index Fund 10.7 Fidelity Series Investment Grade Bond Fund 9.9 Fidelity Series Corporate Bond Fund 6.4 Fidelity Series Investment Grade Securitized Fund 6.0 Fidelity Series International Developed Markets Bond Index Fund 4.8 Fidelity Series Treasury Bill Index Fund 4.3 Fidelity Series Large Cap Value Index Fund 4.1 Fidelity Series Emerging Markets Opportunities Fund 3.9 Fidelity Series Blue Chip Growth Fund 3.5 74.0 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
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| Material Fund Change Name [Text Block] | The fund's name changed from Fidelity Freedom® Blend Income Fund to Fidelity Freedom® Blend Retirement Fund during the reporting period. | |||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period.
|
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| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period. | |||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Freedom Blend 2070 Fund - Class K | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2070 Fund | |||||||||||||||||||
| Class Name | Fidelity Freedom® Blend 2070 Fund Class K | |||||||||||||||||||
| Trading Symbol | FRBZX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2070 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-835-5092 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
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| Expenses Paid, Amount | $ 41 | |||||||||||||||||||
| Expense Ratio, Percent | 0.37% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE June 28, 2024 through March 31, 2026. Initial investment of $10,000. Class K $10,000 $10,350 $12,576 Fidelity Freedom 2070 Composite Index℠ $10,000 $10,441 $12,428 S&P 500® Index $10,000 $10,380 $12,229 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year Life of Fund A Class K 21.51% 13.99% Fidelity Freedom 2070 Composite Index℠ 19.02% 13.22% S&P 500® Index 17.80% 12.18% A From June 28, 2024 Visit www.401k.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Jun. 28, 2024 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.401k.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 47,210,850 | $ 47,210,850 | $ 47,210,850 | $ 47,210,850 | $ 47,210,850 | |||||||||||||||
| Holdings Count | shares | 22 | 22 | 22 | 22 | 22 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 75,991 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 28.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Domestic Equity Funds 53.0 International Equity Funds 42.3 Bond Funds 4.6 Short-Term Investments and Net Other Assets (Liabilities) 0.1 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 53.0 International Equity Funds - 42.3 Bond Funds - 4.6 Short-Term Investments and Net Other Assets (Liabilities) - 0.1 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 14.8 Fidelity Series Blue Chip Growth Fund 12.5 Fidelity Series Emerging Markets Opportunities Fund 10.7 Fidelity Series Large Cap Growth Index Fund 8.0 Fidelity Series Large Cap Stock Fund 7.8 Fidelity Series International Value Fund 7.1 Fidelity Series Overseas Fund 7.1 Fidelity Series International Growth Fund 7.1 Fidelity Series Value Discovery Fund 5.4 Fidelity Series Long-Term Treasury Bond Index Fund 4.6 85.1 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
|||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The fees associated with this class changed during the reporting year. The variations in class fees are primarily the result of the following changes:
The fund's contractual management fee was reduced during the reporting period.
|
|||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-835-5092</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Freedom Blend 2060 Fund - Class K6 | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2060 Fund | |||||||||||||||||||
| Class Name | Fidelity Freedom® Blend 2060 Fund Class K6 | |||||||||||||||||||
| Trading Symbol | FHCDX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2060 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-835-5092 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 30 | |||||||||||||||||||
| Expense Ratio, Percent | 0.27% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Class K6 $10,000 $9,876 $8,876 $13,862 $14,347 $13,359 $16,189 $17,095 $20,867 Fidelity Freedom 2060 Composite Index℠ $10,000 $9,871 $9,004 $13,506 $14,232 $13,186 $15,842 $16,880 $20,091 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class K6 22.07% 8.52% 10.19% Fidelity Freedom 2060 Composite Index℠ 19.02% 8.27% 9.64% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit www.401k.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.401k.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 1,461,323,638 | $ 1,461,323,638 | $ 1,461,323,638 | $ 1,461,323,638 | $ 1,461,323,638 | |||||||||||||||
| Holdings Count | shares | 42 | 42 | 42 | 42 | 42 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 3,610,611 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 15.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
|||||||||||||||||||
| Holdings [Text Block] | Domestic Equity Funds 55.9 International Equity Funds 41.4 Bond Funds 2.3 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 55.9 International Equity Funds - 41.4 Bond Funds - 2.3 Short-Term Investments and Net Other Assets (Liabilities) - 0.4 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 15.5 Fidelity Series Blue Chip Growth Fund 13.1 Fidelity Series Emerging Markets Opportunities Fund 10.6 Fidelity Series Large Cap Growth Index Fund 8.3 Fidelity Series Large Cap Stock Fund 8.2 Fidelity Series International Value Fund 6.8 Fidelity Series Overseas Fund 6.8 Fidelity Series International Growth Fund 6.8 Fidelity Series Value Discovery Fund 5.5 Fidelity Series Canada Fund 4.1 85.7 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
|||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The fees associated with this class changed during the reporting year. The variations in class fees are primarily the result of the following changes:
The fund's contractual management fee was reduced during the reporting period.
Effective June 1, 2025, the fund's expense contract was amended to reduce its total expenses.
The fund's contractual proxy and shareholder meeting expense cap expired during the reporting period.
|
|||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-835-5092</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2060 Fund - Class I | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2060 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2060 Fund Class I | |||||||||||||||||||
| Trading Symbol | FHKEX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2060 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 53 | |||||||||||||||||||
| Expense Ratio, Percent | 0.47% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Class I $10,000 $9,869 $8,846 $13,784 $14,243 $13,239 $16,008 $16,878 $20,555 Fidelity Freedom 2060 Composite Index℠ $10,000 $9,871 $9,004 $13,506 $14,232 $13,186 $15,842 $16,880 $20,091 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class I 21.78% 8.32% 9.97% Fidelity Freedom 2060 Composite Index℠ 19.02% 8.27% 9.64% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 1,461,323,638 | $ 1,461,323,638 | $ 1,461,323,638 | $ 1,461,323,638 | $ 1,461,323,638 | |||||||||||||||
| Holdings Count | shares | 42 | 42 | 42 | 42 | 42 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 3,610,611 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 15.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
|||||||||||||||||||
| Holdings [Text Block] | Domestic Equity Funds 55.9 International Equity Funds 41.4 Bond Funds 2.3 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 55.9 International Equity Funds - 41.4 Bond Funds - 2.3 Short-Term Investments and Net Other Assets (Liabilities) - 0.4 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 15.5 Fidelity Series Blue Chip Growth Fund 13.1 Fidelity Series Emerging Markets Opportunities Fund 10.6 Fidelity Series Large Cap Growth Index Fund 8.3 Fidelity Series Large Cap Stock Fund 8.2 Fidelity Series International Value Fund 6.8 Fidelity Series Overseas Fund 6.8 Fidelity Series International Growth Fund 6.8 Fidelity Series Value Discovery Fund 5.5 Fidelity Series Canada Fund 4.1 85.7 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
|||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period.
The fund's contractual proxy and shareholder meeting expense cap expired during the reporting period.
|
|||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
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| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2045 Fund - Class C | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2045 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2045 Fund Class C | |||||||||||||||||||
| Trading Symbol | FHDFX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2045 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
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| Expenses Paid, Amount | $ 163 | |||||||||||||||||||
| Expense Ratio, Percent | 1.48% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
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| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Class C $10,000 $9,809 $8,716 $13,442 $13,739 $12,636 $15,135 $15,799 $19,071 Fidelity Freedom 2045 Composite Index℠ $10,000 $9,871 $9,004 $13,506 $14,232 $13,186 $15,842 $16,880 $20,107 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class C (incl. contingent deferred sales charge) 19.71% 7.25% 8.89% Class C 20.71% 7.25% 8.89% Fidelity Freedom 2045 Composite Index℠ 19.12% 8.28% 9.65% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 4,169,922,346 | $ 4,169,922,346 | $ 4,169,922,346 | $ 4,169,922,346 | $ 4,169,922,346 | |||||||||||||||
| Holdings Count | shares | 41 | 41 | 41 | 41 | 41 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 10,616,108 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 16.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Domestic Equity Funds 54.1 International Equity Funds 40.2 Bond Funds 5.3 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 54.1 International Equity Funds - 40.2 Bond Funds - 5.3 Short-Term Investments and Net Other Assets (Liabilities) - 0.4 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 15.0 Fidelity Series Blue Chip Growth Fund 12.7 Fidelity Series Emerging Markets Opportunities Fund 10.3 Fidelity Series Large Cap Growth Index Fund 8.1 Fidelity Series Large Cap Stock Fund 7.9 Fidelity Series International Value Fund 6.6 Fidelity Series Overseas Fund 6.6 Fidelity Series International Growth Fund 6.6 Fidelity Series Value Discovery Fund 5.4 Fidelity Series Canada Fund 4.0 83.2 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
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| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Freedom Blend Retirement Fund - Class K6 | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend Retirement Fund | |||||||||||||||||||
| Class Name | Fidelity Freedom® Blend Retirement Fund Class K6 | |||||||||||||||||||
| Trading Symbol | FHRDX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend Retirement Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-835-5092 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 22 | |||||||||||||||||||
| Expense Ratio, Percent | 0.21% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Class K6 $10,000 $10,224 $10,426 $11,729 $11,634 $11,140 $11,787 $12,427 $13,455 Fidelity Freedom Retirement Composite Index℠ $10,000 $10,223 $10,623 $11,687 $11,652 $11,208 $11,896 $12,555 $13,448 Bloomberg U.S. Aggregate Bond Index $10,000 $10,395 $11,324 $11,404 $10,931 $10,408 $10,585 $11,101 $11,584 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class K6 8.28% 2.78% 3.99% Fidelity Freedom Retirement Composite Index℠ 7.11% 2.85% 3.98% Bloomberg U.S. Aggregate Bond Index 4.35% 0.31% 1.96% A From August 31, 2018 Visit www.401k.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.401k.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 217,536,466 | $ 217,536,466 | $ 217,536,466 | $ 217,536,466 | $ 217,536,466 | |||||||||||||||
| Holdings Count | shares | 47 | 47 | 47 | 47 | 47 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 491,972 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 38.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
|||||||||||||||||||
| Holdings [Text Block] | Bond Funds 61.3 Domestic Equity Funds 16.3 International Equity Funds 14.7 Short-Term Funds 7.4 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) Bond Funds - 61.3 Domestic Equity Funds - 16.3 International Equity Funds - 14.7 Short-Term Funds - 7.4 Short-Term Investments and Net Other Assets (Liabilities) - 0.3 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 20.4 Fidelity Series Government Bond Index Fund 10.7 Fidelity Series Investment Grade Bond Fund 9.9 Fidelity Series Corporate Bond Fund 6.4 Fidelity Series Investment Grade Securitized Fund 6.0 Fidelity Series International Developed Markets Bond Index Fund 4.8 Fidelity Series Treasury Bill Index Fund 4.3 Fidelity Series Large Cap Value Index Fund 4.1 Fidelity Series Emerging Markets Opportunities Fund 3.9 Fidelity Series Blue Chip Growth Fund 3.5 74.0 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
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| Material Fund Change Name [Text Block] | The fund's name changed from Fidelity Freedom® Blend Income Fund to Fidelity Freedom® Blend Retirement Fund during the reporting period. | |||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period.
Effective June 1, 2025, the fund's expense contract was amended to reduce its total expenses.
|
|||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period. | |||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-835-5092</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2010 Fund - Class A | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2010 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2010 Fund Class A | |||||||||||||||||||
| Trading Symbol | FHABX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2010 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 69 | |||||||||||||||||||
| Expense Ratio, Percent | 0.66% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000 and the current sales charge was paid. Class A $9,425 $9,542 $9,463 $11,352 $11,272 $10,650 $11,385 $11,956 $13,015 Fidelity Freedom 2010 Composite Index℠ $10,000 $10,147 $10,290 $12,077 $12,146 $11,556 $12,434 $13,135 $14,196 Bloomberg U.S. Aggregate Bond Index $10,000 $10,395 $11,324 $11,404 $10,931 $10,408 $10,585 $11,101 $11,584 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class A (incl. 5.75% sales charge) 2.60% 1.56% 3.54% Class A (without 5.75% sales charge) 8.85% 2.77% 4.35% Fidelity Freedom 2010 Composite Index℠ 8.08% 3.28% 4.73% Bloomberg U.S. Aggregate Bond Index 4.35% 0.31% 1.96% A From August 31, 2018 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 203,748,419 | $ 203,748,419 | $ 203,748,419 | $ 203,748,419 | $ 203,748,419 | |||||||||||||||
| Holdings Count | shares | 46 | 46 | 46 | 46 | 46 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 441,074 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 28.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Bond Funds 59.4 Domestic Equity Funds 17.9 International Equity Funds 16.0 Short-Term Funds 6.5 Short-Term Investments and Net Other Assets (Liabilities) 0.2 ASSET ALLOCATION (% of Fund's net assets) Bond Funds - 59.4 Domestic Equity Funds - 17.9 International Equity Funds - 16.0 Short-Term Funds - 6.5 Short-Term Investments and Net Other Assets (Liabilities) - 0.2 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 17.8 Fidelity Series Government Bond Index Fund 10.4 Fidelity Series Investment Grade Bond Fund 9.7 Fidelity Series Corporate Bond Fund 6.2 Fidelity Series Investment Grade Securitized Fund 5.8 Fidelity Series International Developed Markets Bond Index Fund 4.8 Fidelity Series Large Cap Value Index Fund 4.6 Fidelity Series Emerging Markets Opportunities Fund 4.2 Fidelity Series Blue Chip Growth Fund 3.9 Fidelity Series Treasury Bill Index Fund 3.8 71.2 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
|||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2025 Fund - Class M | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2025 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2025 Fund Class M | |||||||||||||||||||
| Trading Symbol | FJAGX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2025 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 100 | |||||||||||||||||||
| Expense Ratio, Percent | 0.94% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
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| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000 and the current sales charge was paid. Class M $9,650 $9,665 $9,187 $12,308 $12,347 $11,446 $12,773 $13,358 $15,158 Fidelity Freedom 2025 Composite Index℠ $10,000 $10,043 $9,773 $12,764 $13,051 $12,167 $13,642 $14,434 $16,215 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class M (incl. 3.50% sales charge) 9.51% 3.51% 5.64% Class M (without 3.50% sales charge) 13.48% 4.25% 6.14% Fidelity Freedom 2025 Composite Index℠ 12.34% 4.90% 6.58% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 2,514,301,835 | $ 2,514,301,835 | $ 2,514,301,835 | $ 2,514,301,835 | $ 2,514,301,835 | |||||||||||||||
| Holdings Count | shares | 47 | 47 | 47 | 47 | 47 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 6,931,716 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 27.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Bond Funds 43.4 Domestic Equity Funds 31.1 International Equity Funds 25.2 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) Bond Funds - 43.4 Domestic Equity Funds - 31.1 International Equity Funds - 25.2 Short-Term Investments and Net Other Assets (Liabilities) - 0.3 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 8.9 Fidelity Series Large Cap Value Index Fund 8.6 Fidelity Series Government Bond Index Fund 7.8 Fidelity Series Investment Grade Bond Fund 7.2 Fidelity Series Blue Chip Growth Fund 7.2 Fidelity Series Emerging Markets Opportunities Fund 6.5 Fidelity Series International Developed Markets Bond Index Fund 4.8 Fidelity Series Corporate Bond Fund 4.7 Fidelity Series Large Cap Growth Index Fund 4.6 Fidelity Series Large Cap Stock Fund 4.5 64.8 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
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| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
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| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2070 Fund - Class Z | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2070 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2070 Fund Class Z | |||||||||||||||||||
| Trading Symbol | FRCNX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2070 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 41 | |||||||||||||||||||
| Expense Ratio, Percent | 0.37% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE June 28, 2024 through March 31, 2026. Initial investment of $10,000. Class Z $10,000 $10,352 $12,580 Fidelity Freedom 2070 Composite Index℠ $10,000 $10,441 $12,428 S&P 500® Index $10,000 $10,380 $12,229 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year Life of Fund A Class Z 21.52% 14.01% Fidelity Freedom 2070 Composite Index℠ 19.02% 13.22% S&P 500® Index 17.80% 12.18% A From June 28, 2024 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Jun. 28, 2024 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 47,210,850 | $ 47,210,850 | $ 47,210,850 | $ 47,210,850 | $ 47,210,850 | |||||||||||||||
| Holdings Count | shares | 22 | 22 | 22 | 22 | 22 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 75,991 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 28.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
|||||||||||||||||||
| Holdings [Text Block] | Domestic Equity Funds 53.0 International Equity Funds 42.3 Bond Funds 4.6 Short-Term Investments and Net Other Assets (Liabilities) 0.1 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 53.0 International Equity Funds - 42.3 Bond Funds - 4.6 Short-Term Investments and Net Other Assets (Liabilities) - 0.1 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 14.8 Fidelity Series Blue Chip Growth Fund 12.5 Fidelity Series Emerging Markets Opportunities Fund 10.7 Fidelity Series Large Cap Growth Index Fund 8.0 Fidelity Series Large Cap Stock Fund 7.8 Fidelity Series International Value Fund 7.1 Fidelity Series Overseas Fund 7.1 Fidelity Series International Growth Fund 7.1 Fidelity Series Value Discovery Fund 5.4 Fidelity Series Long-Term Treasury Bond Index Fund 4.6 85.1 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
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| Material Fund Change Expenses [Text Block] | The fees associated with this class changed during the reporting year. The variations in class fees are primarily the result of the following changes:
The fund's contractual management fee was reduced during the reporting period.
|
|||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Freedom Blend 2045 Fund | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2045 Fund | |||||||||||||||||||
| Class Name | Fidelity Freedom® Blend 2045 Fund | |||||||||||||||||||
| Trading Symbol | FHAQX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2045 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-544-8544 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 53 | |||||||||||||||||||
| Expense Ratio, Percent | 0.47% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Fidelity Freedom® Blend 2045 Fund $10,000 $9,869 $8,853 $13,795 $14,246 $13,238 $16,010 $16,871 $20,568 Fidelity Freedom 2045 Composite Index℠ $10,000 $9,871 $9,004 $13,506 $14,232 $13,186 $15,842 $16,880 $20,107 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Fidelity Freedom® Blend 2045 Fund 21.91% 8.32% 9.98% Fidelity Freedom 2045 Composite Index℠ 19.12% 8.28% 9.65% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit www.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 4,169,922,346 | $ 4,169,922,346 | $ 4,169,922,346 | $ 4,169,922,346 | $ 4,169,922,346 | |||||||||||||||
| Holdings Count | shares | 41 | 41 | 41 | 41 | 41 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 10,616,108 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 16.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Domestic Equity Funds 54.1 International Equity Funds 40.2 Bond Funds 5.3 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 54.1 International Equity Funds - 40.2 Bond Funds - 5.3 Short-Term Investments and Net Other Assets (Liabilities) - 0.4 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 15.0 Fidelity Series Blue Chip Growth Fund 12.7 Fidelity Series Emerging Markets Opportunities Fund 10.3 Fidelity Series Large Cap Growth Index Fund 8.1 Fidelity Series Large Cap Stock Fund 7.9 Fidelity Series International Value Fund 6.6 Fidelity Series Overseas Fund 6.6 Fidelity Series International Growth Fund 6.6 Fidelity Series Value Discovery Fund 5.4 Fidelity Series Canada Fund 4.0 83.2 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
|||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-8544</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Freedom Blend Retirement Fund - Class A | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend Retirement Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend Retirement Fund Class A | |||||||||||||||||||
| Trading Symbol | FHAMX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend Retirement Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 69 | |||||||||||||||||||
| Expense Ratio, Percent | 0.66% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
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| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000 and the current sales charge was paid. Class A $9,425 $9,605 $9,759 $10,924 $10,782 $10,287 $10,837 $11,372 $12,260 Fidelity Freedom Retirement Composite Index℠ $10,000 $10,223 $10,623 $11,687 $11,652 $11,208 $11,896 $12,555 $13,448 Bloomberg U.S. Aggregate Bond Index $10,000 $10,395 $11,324 $11,404 $10,931 $10,408 $10,585 $11,101 $11,584 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class A (incl. 5.75% sales charge) 1.61% 1.13% 2.72% Class A (without 5.75% sales charge) 7.81% 2.33% 3.53% Fidelity Freedom Retirement Composite Index℠ 7.11% 2.85% 3.98% Bloomberg U.S. Aggregate Bond Index 4.35% 0.31% 1.96% A From August 31, 2018 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 217,536,466 | $ 217,536,466 | $ 217,536,466 | $ 217,536,466 | $ 217,536,466 | |||||||||||||||
| Holdings Count | shares | 47 | 47 | 47 | 47 | 47 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 491,972 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 38.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Bond Funds 61.3 Domestic Equity Funds 16.3 International Equity Funds 14.7 Short-Term Funds 7.4 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) Bond Funds - 61.3 Domestic Equity Funds - 16.3 International Equity Funds - 14.7 Short-Term Funds - 7.4 Short-Term Investments and Net Other Assets (Liabilities) - 0.3 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 20.4 Fidelity Series Government Bond Index Fund 10.7 Fidelity Series Investment Grade Bond Fund 9.9 Fidelity Series Corporate Bond Fund 6.4 Fidelity Series Investment Grade Securitized Fund 6.0 Fidelity Series International Developed Markets Bond Index Fund 4.8 Fidelity Series Treasury Bill Index Fund 4.3 Fidelity Series Large Cap Value Index Fund 4.1 Fidelity Series Emerging Markets Opportunities Fund 3.9 Fidelity Series Blue Chip Growth Fund 3.5 74.0 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
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| Material Fund Change Name [Text Block] | The fund's name changed from Fidelity Freedom® Blend Income Fund to Fidelity Freedom® Blend Retirement Fund during the reporting period. | |||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period.
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| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period. | |||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2055 Fund - Class M | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2055 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2055 Fund Class M | |||||||||||||||||||
| Trading Symbol | FHTEX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2055 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
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| Expenses Paid, Amount | $ 108 | |||||||||||||||||||
| Expense Ratio, Percent | 0.97% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
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| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000 and the current sales charge was paid. Class M $9,650 $9,501 $8,481 $13,142 $13,501 $12,489 $15,030 $15,749 $19,095 Fidelity Freedom 2055 Composite Index℠ $10,000 $9,871 $9,004 $13,506 $14,232 $13,186 $15,842 $16,880 $20,092 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class M (incl. 3.50% sales charge) 17.00% 6.99% 8.90% Class M (without 3.50% sales charge) 21.24% 7.76% 9.42% Fidelity Freedom 2055 Composite Index℠ 19.03% 8.27% 9.64% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 2,613,990,291 | $ 2,613,990,291 | $ 2,613,990,291 | $ 2,613,990,291 | $ 2,613,990,291 | |||||||||||||||
| Holdings Count | shares | 42 | 42 | 42 | 42 | 42 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 6,592,844 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 15.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Domestic Equity Funds 55.8 International Equity Funds 41.3 Bond Funds 2.5 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 55.8 International Equity Funds - 41.3 Bond Funds - 2.5 Short-Term Investments and Net Other Assets (Liabilities) - 0.4 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 15.5 Fidelity Series Blue Chip Growth Fund 13.1 Fidelity Series Emerging Markets Opportunities Fund 10.5 Fidelity Series Large Cap Growth Index Fund 8.3 Fidelity Series Large Cap Stock Fund 8.2 Fidelity Series International Value Fund 6.8 Fidelity Series Overseas Fund 6.8 Fidelity Series International Growth Fund 6.8 Fidelity Series Value Discovery Fund 5.5 Fidelity Series Canada Fund 4.1 85.6 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
|||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2030 Fund - Class M | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2030 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2030 Fund Class M | |||||||||||||||||||
| Trading Symbol | FTYJX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2030 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 103 | |||||||||||||||||||
| Expense Ratio, Percent | 0.96% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000 and the current sales charge was paid. Class M $9,650 $9,596 $8,978 $12,528 $12,626 $11,707 $13,263 $13,881 $15,934 Fidelity Freedom 2030 Composite Index℠ $10,000 $9,983 $9,554 $12,953 $13,325 $12,423 $14,120 $14,955 $16,973 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class M (incl. 3.50% sales charge) 10.77% 4.18% 6.34% Class M (without 3.50% sales charge) 14.79% 4.93% 6.84% Fidelity Freedom 2030 Composite Index℠ 13.50% 5.55% 7.23% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 4,347,223,120 | $ 4,347,223,120 | $ 4,347,223,120 | $ 4,347,223,120 | $ 4,347,223,120 | |||||||||||||||
| Holdings Count | shares | 48 | 48 | 48 | 48 | 48 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 11,303,201 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 20.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Bond Funds 37.0 Domestic Equity Funds 34.9 International Equity Funds 27.8 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) Bond Funds - 37.0 Domestic Equity Funds - 34.9 International Equity Funds - 27.8 Short-Term Investments and Net Other Assets (Liabilities) - 0.3 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 9.6 Fidelity Series Blue Chip Growth Fund 8.2 Fidelity Series Emerging Markets Opportunities Fund 7.1 Fidelity Series Government Bond Index Fund 6.8 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 6.4 Fidelity Series Investment Grade Bond Fund 6.3 Fidelity Series Large Cap Growth Index Fund 5.2 Fidelity Series Large Cap Stock Fund 5.1 Fidelity Series International Developed Markets Bond Index Fund 4.7 Fidelity Series Overseas Fund 4.4 63.8 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
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| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2015 Fund - Class C | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2015 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2015 Fund Class C | |||||||||||||||||||
| Trading Symbol | FJASX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2015 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 149 | |||||||||||||||||||
| Expense Ratio, Percent | 1.42% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Class C $10,000 $10,043 $9,738 $12,102 $11,989 $11,160 $12,025 $12,533 $13,748 Fidelity Freedom 2015 Composite Index℠ $10,000 $10,107 $10,092 $12,336 $12,479 $11,773 $12,850 $13,583 $14,886 Bloomberg U.S. Aggregate Bond Index $10,000 $10,395 $11,324 $11,404 $10,931 $10,408 $10,585 $11,101 $11,584 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class C (incl. contingent deferred sales charge) 8.70% 2.58% 4.29% Class C 9.70% 2.58% 4.29% Fidelity Freedom 2015 Composite Index℠ 9.59% 3.83% 5.39% Bloomberg U.S. Aggregate Bond Index 4.35% 0.31% 1.96% A From August 31, 2018 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 332,449,887 | $ 332,449,887 | $ 332,449,887 | $ 332,449,887 | $ 332,449,887 | |||||||||||||||
| Holdings Count | shares | 45 | 45 | 45 | 45 | 45 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 950,396 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 25.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Bond Funds 54.3 Domestic Equity Funds 22.1 International Equity Funds 18.6 Short-Term Funds 4.7 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) Bond Funds - 54.3 Domestic Equity Funds - 22.1 International Equity Funds - 18.6 Short-Term Funds - 4.7 Short-Term Investments and Net Other Assets (Liabilities) - 0.3 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 11.7 Fidelity Series Government Bond Index Fund 9.8 Fidelity Series Investment Grade Bond Fund 9.1 Fidelity Series Corporate Bond Fund 5.9 Fidelity Series Large Cap Value Index Fund 5.8 Fidelity Series Investment Grade Securitized Fund 5.5 Fidelity Series Blue Chip Growth Fund 4.9 Fidelity Series Emerging Markets Opportunities Fund 4.9 Fidelity Series International Developed Markets Bond Index Fund 4.8 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 3.9 66.3 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
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| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2055 Fund - Class A | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2055 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2055 Fund Class A | |||||||||||||||||||
| Trading Symbol | FHUEX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2055 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 80 | |||||||||||||||||||
| Expense Ratio, Percent | 0.72% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000 and the current sales charge was paid. Class A $9,425 $9,288 $8,308 $12,914 $13,314 $12,338 $14,887 $15,648 $19,023 Fidelity Freedom 2055 Composite Index℠ $10,000 $9,871 $9,004 $13,506 $14,232 $13,186 $15,842 $16,880 $20,092 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class A (incl. 5.75% sales charge) 14.58% 6.78% 8.85% Class A (without 5.75% sales charge) 21.57% 8.05% 9.70% Fidelity Freedom 2055 Composite Index℠ 19.03% 8.27% 9.64% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 2,613,990,291 | $ 2,613,990,291 | $ 2,613,990,291 | $ 2,613,990,291 | $ 2,613,990,291 | |||||||||||||||
| Holdings Count | shares | 42 | 42 | 42 | 42 | 42 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 6,592,844 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 15.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
|||||||||||||||||||
| Holdings [Text Block] | Domestic Equity Funds 55.8 International Equity Funds 41.3 Bond Funds 2.5 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 55.8 International Equity Funds - 41.3 Bond Funds - 2.5 Short-Term Investments and Net Other Assets (Liabilities) - 0.4 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 15.5 Fidelity Series Blue Chip Growth Fund 13.1 Fidelity Series Emerging Markets Opportunities Fund 10.5 Fidelity Series Large Cap Growth Index Fund 8.3 Fidelity Series Large Cap Stock Fund 8.2 Fidelity Series International Value Fund 6.8 Fidelity Series Overseas Fund 6.8 Fidelity Series International Growth Fund 6.8 Fidelity Series Value Discovery Fund 5.5 Fidelity Series Canada Fund 4.1 85.6 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
|||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Freedom Blend 2035 Fund - Class K6 | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2035 Fund | |||||||||||||||||||
| Class Name | Fidelity Freedom® Blend 2035 Fund Class K6 | |||||||||||||||||||
| Trading Symbol | FHJDX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2035 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-835-5092 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 29 | |||||||||||||||||||
| Expense Ratio, Percent | 0.27% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Class K6 $10,000 $9,907 $9,074 $13,619 $13,976 $13,027 $15,238 $16,074 $18,876 Fidelity Freedom 2035 Composite Index℠ $10,000 $9,897 $9,181 $13,259 $13,817 $12,836 $14,933 $15,853 $18,246 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class K6 17.44% 6.75% 8.74% Fidelity Freedom 2035 Composite Index℠ 15.09% 6.59% 8.25% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit www.401k.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.401k.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 4,774,644,697 | $ 4,774,644,697 | $ 4,774,644,697 | $ 4,774,644,697 | $ 4,774,644,697 | |||||||||||||||
| Holdings Count | shares | 48 | 48 | 48 | 48 | 48 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 12,522,295 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 18.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
|||||||||||||||||||
| Holdings [Text Block] | Domestic Equity Funds 39.8 International Equity Funds 30.9 Bond Funds 28.9 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 39.8 International Equity Funds - 30.9 Bond Funds - 28.9 Short-Term Investments and Net Other Assets (Liabilities) - 0.4 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 11.0 Fidelity Series Blue Chip Growth Fund 9.2 Fidelity Series Emerging Markets Opportunities Fund 7.9 Fidelity Series Large Cap Growth Index Fund 5.9 Fidelity Series Large Cap Stock Fund 5.8 Fidelity Series Government Bond Index Fund 5.4 Fidelity Series Investment Grade Bond Fund 5.2 Fidelity Series Overseas Fund 5.0 Fidelity Series International Value Fund 5.0 Fidelity Series International Growth Fund 5.0 65.4 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
|||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period.
Effective June 1, 2025, the fund's expense contract was amended to reduce its total expenses.
|
|||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-835-5092</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Freedom Blend 2020 Fund | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2020 Fund | |||||||||||||||||||
| Class Name | Fidelity Freedom® Blend 2020 Fund | |||||||||||||||||||
| Trading Symbol | FHAVX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2020 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-544-8544 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 46 | |||||||||||||||||||
| Expense Ratio, Percent | 0.43% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Fidelity Freedom® Blend 2020 Fund $10,000 $10,063 $9,723 $12,700 $12,757 $11,913 $13,175 $13,860 $15,590 Fidelity Freedom 2020 Composite Index℠ $10,000 $10,073 $9,915 $12,584 $12,802 $11,972 $13,254 $14,017 $15,570 Bloomberg U.S. Aggregate Bond Index $10,000 $10,395 $11,324 $11,404 $10,931 $10,408 $10,585 $11,101 $11,584 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Fidelity Freedom® Blend 2020 Fund 12.49% 4.19% 6.03% Fidelity Freedom 2020 Composite Index℠ 11.08% 4.35% 6.01% Bloomberg U.S. Aggregate Bond Index 4.35% 0.31% 1.96% A From August 31, 2018 Visit www.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 1,276,372,296 | $ 1,276,372,296 | $ 1,276,372,296 | $ 1,276,372,296 | $ 1,276,372,296 | |||||||||||||||
| Holdings Count | shares | 49 | 49 | 49 | 49 | 49 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 3,260,714 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 30.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
|||||||||||||||||||
| Holdings [Text Block] | Bond Funds 49.2 Domestic Equity Funds 26.6 International Equity Funds 21.8 Short-Term Funds 2.1 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) Bond Funds - 49.2 Domestic Equity Funds - 26.6 International Equity Funds - 21.8 Short-Term Funds - 2.1 Short-Term Investments and Net Other Assets (Liabilities) - 0.3 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Government Bond Index Fund 9.0 Fidelity Series Investment Grade Bond Fund 8.3 Fidelity Series Large Cap Value Index Fund 7.1 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 6.5 Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 6.2 Fidelity Series Blue Chip Growth Fund 6.0 Fidelity Series Emerging Markets Opportunities Fund 5.7 Fidelity Series Corporate Bond Fund 5.4 Fidelity Series Investment Grade Securitized Fund 5.1 Fidelity Series International Developed Markets Bond Index Fund 4.8 64.1 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
|||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
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| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-8544</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2055 Fund - Class Z | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2055 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2055 Fund Class Z | |||||||||||||||||||
| Trading Symbol | FHPEX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2055 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
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| Expenses Paid, Amount | $ 41 | |||||||||||||||||||
| Expense Ratio, Percent | 0.37% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Class Z $10,000 $9,877 $8,867 $13,834 $14,307 $13,311 $16,106 $16,998 $20,725 Fidelity Freedom 2055 Composite Index℠ $10,000 $9,871 $9,004 $13,506 $14,232 $13,186 $15,842 $16,880 $20,092 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class Z 21.93% 8.42% 10.09% Fidelity Freedom 2055 Composite Index℠ 19.03% 8.27% 9.64% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 2,613,990,291 | $ 2,613,990,291 | $ 2,613,990,291 | $ 2,613,990,291 | $ 2,613,990,291 | |||||||||||||||
| Holdings Count | shares | 42 | 42 | 42 | 42 | 42 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 6,592,844 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 15.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Domestic Equity Funds 55.8 International Equity Funds 41.3 Bond Funds 2.5 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 55.8 International Equity Funds - 41.3 Bond Funds - 2.5 Short-Term Investments and Net Other Assets (Liabilities) - 0.4 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 15.5 Fidelity Series Blue Chip Growth Fund 13.1 Fidelity Series Emerging Markets Opportunities Fund 10.5 Fidelity Series Large Cap Growth Index Fund 8.3 Fidelity Series Large Cap Stock Fund 8.2 Fidelity Series International Value Fund 6.8 Fidelity Series Overseas Fund 6.8 Fidelity Series International Growth Fund 6.8 Fidelity Series Value Discovery Fund 5.5 Fidelity Series Canada Fund 4.1 85.6 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
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| Material Fund Change Expenses [Text Block] | The fees associated with this class changed during the reporting year. The variations in class fees are primarily the result of the following changes:
The fund's contractual management fee was reduced during the reporting period.
|
|||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2050 Fund - Class M | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2050 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2050 Fund Class M | |||||||||||||||||||
| Trading Symbol | FHYEX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2050 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 108 | |||||||||||||||||||
| Expense Ratio, Percent | 0.97% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000 and the current sales charge was paid. Class M $9,650 $9,495 $8,470 $13,131 $13,495 $12,481 $15,011 $15,746 $19,100 Fidelity Freedom 2050 Composite Index℠ $10,000 $9,871 $9,004 $13,506 $14,232 $13,186 $15,842 $16,880 $20,099 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class M (incl. 3.50% sales charge) 17.06% 7.02% 8.91% Class M (without 3.50% sales charge) 21.30% 7.78% 9.42% Fidelity Freedom 2050 Composite Index℠ 19.07% 8.27% 9.64% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 3,689,428,934 | $ 3,689,428,934 | $ 3,689,428,934 | $ 3,689,428,934 | $ 3,689,428,934 | |||||||||||||||
| Holdings Count | shares | 41 | 41 | 41 | 41 | 41 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 9,358,090 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 16.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
|||||||||||||||||||
| Holdings [Text Block] | Domestic Equity Funds 55.0 International Equity Funds 40.8 Bond Funds 3.9 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 55.0 International Equity Funds - 40.8 Bond Funds - 3.9 Short-Term Investments and Net Other Assets (Liabilities) - 0.3 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 15.3 Fidelity Series Blue Chip Growth Fund 12.9 Fidelity Series Emerging Markets Opportunities Fund 10.4 Fidelity Series Large Cap Growth Index Fund 8.2 Fidelity Series Large Cap Stock Fund 8.0 Fidelity Series Overseas Fund 6.7 Fidelity Series International Value Fund 6.7 Fidelity Series International Growth Fund 6.7 Fidelity Series Value Discovery Fund 5.4 Fidelity Series Canada Fund 4.0 84.3 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
|||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Freedom Blend 2035 Fund - Class K | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2035 Fund | |||||||||||||||||||
| Class Name | Fidelity Freedom® Blend 2035 Fund Class K | |||||||||||||||||||
| Trading Symbol | FHZDX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2035 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-835-5092 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 40 | |||||||||||||||||||
| Expense Ratio, Percent | 0.37% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Class K $10,000 $9,903 $9,055 $13,579 $13,925 $12,964 $15,156 $15,974 $18,728 Fidelity Freedom 2035 Composite Index℠ $10,000 $9,897 $9,181 $13,259 $13,817 $12,836 $14,933 $15,853 $18,246 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class K 17.24% 6.64% 8.63% Fidelity Freedom 2035 Composite Index℠ 15.09% 6.59% 8.25% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit www.401k.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.401k.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 4,774,644,697 | $ 4,774,644,697 | $ 4,774,644,697 | $ 4,774,644,697 | $ 4,774,644,697 | |||||||||||||||
| Holdings Count | shares | 48 | 48 | 48 | 48 | 48 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 12,522,295 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 18.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
|||||||||||||||||||
| Holdings [Text Block] | Domestic Equity Funds 39.8 International Equity Funds 30.9 Bond Funds 28.9 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 39.8 International Equity Funds - 30.9 Bond Funds - 28.9 Short-Term Investments and Net Other Assets (Liabilities) - 0.4 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 11.0 Fidelity Series Blue Chip Growth Fund 9.2 Fidelity Series Emerging Markets Opportunities Fund 7.9 Fidelity Series Large Cap Growth Index Fund 5.9 Fidelity Series Large Cap Stock Fund 5.8 Fidelity Series Government Bond Index Fund 5.4 Fidelity Series Investment Grade Bond Fund 5.2 Fidelity Series Overseas Fund 5.0 Fidelity Series International Value Fund 5.0 Fidelity Series International Growth Fund 5.0 65.4 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
|||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-835-5092</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2025 Fund - Class Z | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2025 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2025 Fund Class Z | |||||||||||||||||||
| Trading Symbol | FJABX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2025 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
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| Expenses Paid, Amount | $ 36 | |||||||||||||||||||
| Expense Ratio, Percent | 0.34% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
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| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Class Z $10,000 $10,047 $9,614 $12,952 $13,082 $12,188 $13,690 $14,398 $16,444 Fidelity Freedom 2025 Composite Index℠ $10,000 $10,043 $9,773 $12,764 $13,051 $12,167 $13,642 $14,434 $16,215 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class Z 14.21% 4.89% 6.78% Fidelity Freedom 2025 Composite Index℠ 12.34% 4.90% 6.58% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 2,514,301,835 | $ 2,514,301,835 | $ 2,514,301,835 | $ 2,514,301,835 | $ 2,514,301,835 | |||||||||||||||
| Holdings Count | shares | 47 | 47 | 47 | 47 | 47 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 6,931,716 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 27.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Bond Funds 43.4 Domestic Equity Funds 31.1 International Equity Funds 25.2 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) Bond Funds - 43.4 Domestic Equity Funds - 31.1 International Equity Funds - 25.2 Short-Term Investments and Net Other Assets (Liabilities) - 0.3 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 8.9 Fidelity Series Large Cap Value Index Fund 8.6 Fidelity Series Government Bond Index Fund 7.8 Fidelity Series Investment Grade Bond Fund 7.2 Fidelity Series Blue Chip Growth Fund 7.2 Fidelity Series Emerging Markets Opportunities Fund 6.5 Fidelity Series International Developed Markets Bond Index Fund 4.8 Fidelity Series Corporate Bond Fund 4.7 Fidelity Series Large Cap Growth Index Fund 4.6 Fidelity Series Large Cap Stock Fund 4.5 64.8 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
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| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
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| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Freedom Blend 2055 Fund - Class K6 | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2055 Fund | |||||||||||||||||||
| Class Name | Fidelity Freedom® Blend 2055 Fund Class K6 | |||||||||||||||||||
| Trading Symbol | FHDDX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2055 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-835-5092 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 30 | |||||||||||||||||||
| Expense Ratio, Percent | 0.27% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Class K6 $10,000 $9,881 $8,882 $13,863 $14,363 $13,371 $16,202 $17,100 $20,886 Fidelity Freedom 2055 Composite Index℠ $10,000 $9,871 $9,004 $13,506 $14,232 $13,186 $15,842 $16,880 $20,092 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class K6 22.14% 8.54% 10.20% Fidelity Freedom 2055 Composite Index℠ 19.03% 8.27% 9.64% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit www.401k.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.401k.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 2,613,990,291 | $ 2,613,990,291 | $ 2,613,990,291 | $ 2,613,990,291 | $ 2,613,990,291 | |||||||||||||||
| Holdings Count | shares | 42 | 42 | 42 | 42 | 42 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 6,592,844 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 15.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Domestic Equity Funds 55.8 International Equity Funds 41.3 Bond Funds 2.5 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 55.8 International Equity Funds - 41.3 Bond Funds - 2.5 Short-Term Investments and Net Other Assets (Liabilities) - 0.4 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 15.5 Fidelity Series Blue Chip Growth Fund 13.1 Fidelity Series Emerging Markets Opportunities Fund 10.5 Fidelity Series Large Cap Growth Index Fund 8.3 Fidelity Series Large Cap Stock Fund 8.2 Fidelity Series International Value Fund 6.8 Fidelity Series Overseas Fund 6.8 Fidelity Series International Growth Fund 6.8 Fidelity Series Value Discovery Fund 5.5 Fidelity Series Canada Fund 4.1 85.6 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
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| Material Fund Change Expenses [Text Block] | The fees associated with this class changed during the reporting year. The variations in class fees are primarily the result of the following changes:
The fund's contractual management fee was reduced during the reporting period.
Effective June 1, 2025, the fund's expense contract was amended to reduce its total expenses.
|
|||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-835-5092</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Freedom Blend 2040 Fund | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2040 Fund | |||||||||||||||||||
| Class Name | Fidelity Freedom® Blend 2040 Fund | |||||||||||||||||||
| Trading Symbol | FHARX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2040 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-544-8544 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 52 | |||||||||||||||||||
| Expense Ratio, Percent | 0.47% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Fidelity Freedom® Blend 2040 Fund $10,000 $9,865 $8,855 $13,805 $14,255 $13,233 $15,876 $16,739 $20,121 Fidelity Freedom 2040 Composite Index℠ $10,000 $9,871 $9,004 $13,506 $14,229 $13,178 $15,712 $16,727 $19,689 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Fidelity Freedom® Blend 2040 Fund 20.20% 7.83% 9.66% Fidelity Freedom 2040 Composite Index℠ 17.71% 7.83% 9.35% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit www.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 4,622,181,262 | $ 4,622,181,262 | $ 4,622,181,262 | $ 4,622,181,262 | $ 4,622,181,262 | |||||||||||||||
| Holdings Count | shares | 48 | 48 | 48 | 48 | 48 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 11,983,334 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 18.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Domestic Equity Funds 48.6 International Equity Funds 36.7 Bond Funds 14.3 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 48.6 International Equity Funds - 36.7 Bond Funds - 14.3 Short-Term Investments and Net Other Assets (Liabilities) - 0.4 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 13.5 Fidelity Series Blue Chip Growth Fund 11.4 Fidelity Series Emerging Markets Opportunities Fund 9.4 Fidelity Series Large Cap Growth Index Fund 7.2 Fidelity Series Large Cap Stock Fund 7.1 Fidelity Series Overseas Fund 6.0 Fidelity Series International Value Fund 6.0 Fidelity Series International Growth Fund 6.0 Fidelity Series Value Discovery Fund 4.8 Fidelity Series Long-Term Treasury Bond Index Fund 4.2 75.6 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
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| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-8544</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Freedom Blend 2030 Fund - Class K | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2030 Fund | |||||||||||||||||||
| Class Name | Fidelity Freedom® Blend 2030 Fund Class K | |||||||||||||||||||
| Trading Symbol | FHAEX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2030 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-835-5092 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 39 | |||||||||||||||||||
| Expense Ratio, Percent | 0.36% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Class K $10,000 $9,985 $9,399 $13,186 $13,376 $12,472 $14,212 $14,966 $17,272 Fidelity Freedom 2030 Composite Index℠ $10,000 $9,983 $9,554 $12,953 $13,325 $12,423 $14,120 $14,955 $16,973 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class K 15.41% 5.55% 7.47% Fidelity Freedom 2030 Composite Index℠ 13.50% 5.55% 7.23% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit www.401k.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.401k.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 4,347,223,120 | $ 4,347,223,120 | $ 4,347,223,120 | $ 4,347,223,120 | $ 4,347,223,120 | |||||||||||||||
| Holdings Count | shares | 48 | 48 | 48 | 48 | 48 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 11,303,201 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 20.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
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| Holdings [Text Block] | Bond Funds 37.0 Domestic Equity Funds 34.9 International Equity Funds 27.8 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) Bond Funds - 37.0 Domestic Equity Funds - 34.9 International Equity Funds - 27.8 Short-Term Investments and Net Other Assets (Liabilities) - 0.3 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 9.6 Fidelity Series Blue Chip Growth Fund 8.2 Fidelity Series Emerging Markets Opportunities Fund 7.1 Fidelity Series Government Bond Index Fund 6.8 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 6.4 Fidelity Series Investment Grade Bond Fund 6.3 Fidelity Series Large Cap Growth Index Fund 5.2 Fidelity Series Large Cap Stock Fund 5.1 Fidelity Series International Developed Markets Bond Index Fund 4.7 Fidelity Series Overseas Fund 4.4 63.8 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com.
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| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
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| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-835-5092</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2060 Fund - Class C | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2060 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2060 Fund Class C | |||||||||||||||||||
| Trading Symbol | FHLEX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2060 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
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| Expenses Paid, Amount | $ 163 | |||||||||||||||||||
| Expense Ratio, Percent | 1.48% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Class C $10,000 $9,813 $8,712 $13,432 $13,740 $12,640 $15,139 $15,792 $19,043 Fidelity Freedom 2060 Composite Index℠ $10,000 $9,871 $9,004 $13,506 $14,232 $13,186 $15,842 $16,880 $20,091 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class C (incl. contingent deferred sales charge) 19.59% 7.23% 8.87% Class C 20.59% 7.23% 8.87% Fidelity Freedom 2060 Composite Index℠ 19.02% 8.27% 9.64% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 1,461,323,638 | $ 1,461,323,638 | $ 1,461,323,638 | $ 1,461,323,638 | $ 1,461,323,638 | |||||||||||||||
| Holdings Count | shares | 42 | 42 | 42 | 42 | 42 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 3,610,611 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 15.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Domestic Equity Funds 55.9 International Equity Funds 41.4 Bond Funds 2.3 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 55.9 International Equity Funds - 41.4 Bond Funds - 2.3 Short-Term Investments and Net Other Assets (Liabilities) - 0.4 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 15.5 Fidelity Series Blue Chip Growth Fund 13.1 Fidelity Series Emerging Markets Opportunities Fund 10.6 Fidelity Series Large Cap Growth Index Fund 8.3 Fidelity Series Large Cap Stock Fund 8.2 Fidelity Series International Value Fund 6.8 Fidelity Series Overseas Fund 6.8 Fidelity Series International Growth Fund 6.8 Fidelity Series Value Discovery Fund 5.5 Fidelity Series Canada Fund 4.1 85.7 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
|||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period.
The fund's contractual proxy and shareholder meeting expense cap expired during the reporting period.
|
|||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2030 Fund - Class A | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2030 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2030 Fund Class A | |||||||||||||||||||
| Trading Symbol | FJAMX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2030 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 76 | |||||||||||||||||||
| Expense Ratio, Percent | 0.71% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000 and the current sales charge was paid. Class A $9,425 $9,383 $8,812 $12,312 $12,442 $11,568 $13,135 $13,780 $15,860 Fidelity Freedom 2030 Composite Index℠ $10,000 $9,983 $9,554 $12,953 $13,325 $12,423 $14,120 $14,955 $16,973 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class A (incl. 5.75% sales charge) 8.47% 3.96% 6.27% Class A (without 5.75% sales charge) 15.09% 5.19% 7.10% Fidelity Freedom 2030 Composite Index℠ 13.50% 5.55% 7.23% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 4,347,223,120 | $ 4,347,223,120 | $ 4,347,223,120 | $ 4,347,223,120 | $ 4,347,223,120 | |||||||||||||||
| Holdings Count | shares | 48 | 48 | 48 | 48 | 48 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 11,303,201 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 20.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Bond Funds 37.0 Domestic Equity Funds 34.9 International Equity Funds 27.8 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) Bond Funds - 37.0 Domestic Equity Funds - 34.9 International Equity Funds - 27.8 Short-Term Investments and Net Other Assets (Liabilities) - 0.3 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 9.6 Fidelity Series Blue Chip Growth Fund 8.2 Fidelity Series Emerging Markets Opportunities Fund 7.1 Fidelity Series Government Bond Index Fund 6.8 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 6.4 Fidelity Series Investment Grade Bond Fund 6.3 Fidelity Series Large Cap Growth Index Fund 5.2 Fidelity Series Large Cap Stock Fund 5.1 Fidelity Series International Developed Markets Bond Index Fund 4.7 Fidelity Series Overseas Fund 4.4 63.8 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
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| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2065 Fund - Class I | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2065 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2065 Fund Class I | |||||||||||||||||||
| Trading Symbol | FAXFX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2065 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 52 | |||||||||||||||||||
| Expense Ratio, Percent | 0.47% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE June 28, 2019 through March 31, 2026. Initial investment of $10,000. Class I $10,000 $8,666 $13,498 $13,953 $12,959 $15,674 $16,515 $20,123 Fidelity Freedom 2065 Composite Index℠ $10,000 $8,783 $13,174 $13,882 $12,862 $15,453 $16,465 $19,597 S&P 500® Index $10,000 $8,918 $13,944 $16,126 $14,879 $19,326 $20,920 $24,645 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class I 21.85% 8.31% 10.92% Fidelity Freedom 2065 Composite Index℠ 19.02% 8.27% 10.48% S&P 500® Index 17.80% 12.06% 14.30% A From June 28, 2019 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Jun. 28, 2019 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 560,851,778 | $ 560,851,778 | $ 560,851,778 | $ 560,851,778 | $ 560,851,778 | |||||||||||||||
| Holdings Count | shares | 42 | 42 | 42 | 42 | 42 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 1,336,669 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 16.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Domestic Equity Funds 55.9 International Equity Funds 41.4 Bond Funds 2.3 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 55.9 International Equity Funds - 41.4 Bond Funds - 2.3 Short-Term Investments and Net Other Assets (Liabilities) - 0.4 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 15.6 Fidelity Series Blue Chip Growth Fund 13.1 Fidelity Series Emerging Markets Opportunities Fund 10.6 Fidelity Series Large Cap Growth Index Fund 8.3 Fidelity Series Large Cap Stock Fund 8.2 Fidelity Series International Value Fund 6.8 Fidelity Series Overseas Fund 6.8 Fidelity Series International Growth Fund 6.8 Fidelity Series Value Discovery Fund 5.6 Fidelity Series Canada Fund 4.1 85.9 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
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| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period.
The fund's contractual proxy and shareholder meeting expense cap expired during the reporting period.
|
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| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
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| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2040 Fund - Class M | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2040 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2040 Fund Class M | |||||||||||||||||||
| Trading Symbol | FHOEX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2040 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
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| Expenses Paid, Amount | $ 107 | |||||||||||||||||||
| Expense Ratio, Percent | 0.97% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
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| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000 and the current sales charge was paid. Class M $9,650 $9,497 $8,477 $13,145 $13,503 $12,478 $14,891 $15,623 $18,677 Fidelity Freedom 2040 Composite Index℠ $10,000 $9,871 $9,004 $13,506 $14,229 $13,178 $15,712 $16,727 $19,689 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class M (incl. 3.50% sales charge) 15.36% 6.52% 8.59% Class M (without 3.50% sales charge) 19.55% 7.28% 9.10% Fidelity Freedom 2040 Composite Index℠ 17.71% 7.83% 9.35% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 4,622,181,262 | $ 4,622,181,262 | $ 4,622,181,262 | $ 4,622,181,262 | $ 4,622,181,262 | |||||||||||||||
| Holdings Count | shares | 48 | 48 | 48 | 48 | 48 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 11,983,334 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 18.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Domestic Equity Funds 48.6 International Equity Funds 36.7 Bond Funds 14.3 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 48.6 International Equity Funds - 36.7 Bond Funds - 14.3 Short-Term Investments and Net Other Assets (Liabilities) - 0.4 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 13.5 Fidelity Series Blue Chip Growth Fund 11.4 Fidelity Series Emerging Markets Opportunities Fund 9.4 Fidelity Series Large Cap Growth Index Fund 7.2 Fidelity Series Large Cap Stock Fund 7.1 Fidelity Series Overseas Fund 6.0 Fidelity Series International Value Fund 6.0 Fidelity Series International Growth Fund 6.0 Fidelity Series Value Discovery Fund 4.8 Fidelity Series Long-Term Treasury Bond Index Fund 4.2 75.6 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
|||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2010 Fund - Class Z | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2010 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2010 Fund Class Z | |||||||||||||||||||
| Trading Symbol | FJAVX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2010 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 32 | |||||||||||||||||||
| Expense Ratio, Percent | 0.31% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Class Z $10,000 $10,138 $10,097 $12,159 $12,113 $11,489 $12,321 $12,981 $14,191 Fidelity Freedom 2010 Composite Index℠ $10,000 $10,147 $10,290 $12,077 $12,146 $11,556 $12,434 $13,135 $14,196 Bloomberg U.S. Aggregate Bond Index $10,000 $10,395 $11,324 $11,404 $10,931 $10,408 $10,585 $11,101 $11,584 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class Z 9.32% 3.14% 4.72% Fidelity Freedom 2010 Composite Index℠ 8.08% 3.28% 4.73% Bloomberg U.S. Aggregate Bond Index 4.35% 0.31% 1.96% A From August 31, 2018 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 203,748,419 | $ 203,748,419 | $ 203,748,419 | $ 203,748,419 | $ 203,748,419 | |||||||||||||||
| Holdings Count | shares | 46 | 46 | 46 | 46 | 46 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 441,074 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 28.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Bond Funds 59.4 Domestic Equity Funds 17.9 International Equity Funds 16.0 Short-Term Funds 6.5 Short-Term Investments and Net Other Assets (Liabilities) 0.2 ASSET ALLOCATION (% of Fund's net assets) Bond Funds - 59.4 Domestic Equity Funds - 17.9 International Equity Funds - 16.0 Short-Term Funds - 6.5 Short-Term Investments and Net Other Assets (Liabilities) - 0.2 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 17.8 Fidelity Series Government Bond Index Fund 10.4 Fidelity Series Investment Grade Bond Fund 9.7 Fidelity Series Corporate Bond Fund 6.2 Fidelity Series Investment Grade Securitized Fund 5.8 Fidelity Series International Developed Markets Bond Index Fund 4.8 Fidelity Series Large Cap Value Index Fund 4.6 Fidelity Series Emerging Markets Opportunities Fund 4.2 Fidelity Series Blue Chip Growth Fund 3.9 Fidelity Series Treasury Bill Index Fund 3.8 71.2 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
|||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2020 Fund - Class Z | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2020 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2020 Fund Class Z | |||||||||||||||||||
| Trading Symbol | FJAIX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2020 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 35 | |||||||||||||||||||
| Expense Ratio, Percent | 0.33% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Class Z $10,000 $10,073 $9,736 $12,732 $12,802 $11,962 $13,248 $13,943 $15,709 Fidelity Freedom 2020 Composite Index℠ $10,000 $10,073 $9,915 $12,584 $12,802 $11,972 $13,254 $14,017 $15,570 Bloomberg U.S. Aggregate Bond Index $10,000 $10,395 $11,324 $11,404 $10,931 $10,408 $10,585 $11,101 $11,584 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class Z 12.67% 4.29% 6.14% Fidelity Freedom 2020 Composite Index℠ 11.08% 4.35% 6.01% Bloomberg U.S. Aggregate Bond Index 4.35% 0.31% 1.96% A From August 31, 2018 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 1,276,372,296 | $ 1,276,372,296 | $ 1,276,372,296 | $ 1,276,372,296 | $ 1,276,372,296 | |||||||||||||||
| Holdings Count | shares | 49 | 49 | 49 | 49 | 49 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 3,260,714 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 30.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Bond Funds 49.2 Domestic Equity Funds 26.6 International Equity Funds 21.8 Short-Term Funds 2.1 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) Bond Funds - 49.2 Domestic Equity Funds - 26.6 International Equity Funds - 21.8 Short-Term Funds - 2.1 Short-Term Investments and Net Other Assets (Liabilities) - 0.3 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Government Bond Index Fund 9.0 Fidelity Series Investment Grade Bond Fund 8.3 Fidelity Series Large Cap Value Index Fund 7.1 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 6.5 Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 6.2 Fidelity Series Blue Chip Growth Fund 6.0 Fidelity Series Emerging Markets Opportunities Fund 5.7 Fidelity Series Corporate Bond Fund 5.4 Fidelity Series Investment Grade Securitized Fund 5.1 Fidelity Series International Developed Markets Bond Index Fund 4.8 64.1 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
|||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Freedom Blend Retirement Fund - Class M | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend Retirement Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend Retirement Fund Class M | |||||||||||||||||||
| Trading Symbol | FHALX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend Retirement Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
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| Expenses Paid, Amount | $ 94 | |||||||||||||||||||
| Expense Ratio, Percent | 0.91% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
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| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000 and the current sales charge was paid. Class M $9,650 $9,820 $9,952 $11,112 $10,944 $10,412 $10,938 $11,450 $12,314 Fidelity Freedom Retirement Composite Index℠ $10,000 $10,223 $10,623 $11,687 $11,652 $11,208 $11,896 $12,555 $13,448 Bloomberg U.S. Aggregate Bond Index $10,000 $10,395 $11,324 $11,404 $10,931 $10,408 $10,585 $11,101 $11,584 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class M (incl. 3.50% sales charge) 3.78% 1.35% 2.78% Class M (without 3.50% sales charge) 7.55% 2.08% 3.27% Fidelity Freedom Retirement Composite Index℠ 7.11% 2.85% 3.98% Bloomberg U.S. Aggregate Bond Index 4.35% 0.31% 1.96% A From August 31, 2018 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 217,536,466 | $ 217,536,466 | $ 217,536,466 | $ 217,536,466 | $ 217,536,466 | |||||||||||||||
| Holdings Count | shares | 47 | 47 | 47 | 47 | 47 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 491,972 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 38.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Bond Funds 61.3 Domestic Equity Funds 16.3 International Equity Funds 14.7 Short-Term Funds 7.4 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) Bond Funds - 61.3 Domestic Equity Funds - 16.3 International Equity Funds - 14.7 Short-Term Funds - 7.4 Short-Term Investments and Net Other Assets (Liabilities) - 0.3 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 20.4 Fidelity Series Government Bond Index Fund 10.7 Fidelity Series Investment Grade Bond Fund 9.9 Fidelity Series Corporate Bond Fund 6.4 Fidelity Series Investment Grade Securitized Fund 6.0 Fidelity Series International Developed Markets Bond Index Fund 4.8 Fidelity Series Treasury Bill Index Fund 4.3 Fidelity Series Large Cap Value Index Fund 4.1 Fidelity Series Emerging Markets Opportunities Fund 3.9 Fidelity Series Blue Chip Growth Fund 3.5 74.0 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
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| Material Fund Change Name [Text Block] | The fund's name changed from Fidelity Freedom® Blend Income Fund to Fidelity Freedom® Blend Retirement Fund during the reporting period. | |||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period.
|
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| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period. | |||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Freedom Blend 2050 Fund - Class K6 | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2050 Fund | |||||||||||||||||||
| Class Name | Fidelity Freedom® Blend 2050 Fund Class K6 | |||||||||||||||||||
| Trading Symbol | FHEDX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2050 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-835-5092 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
|||||||||||||||||||
| Expenses Paid, Amount | $ 30 | |||||||||||||||||||
| Expense Ratio, Percent | 0.27% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
|||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Class K6 $10,000 $9,875 $8,875 $13,856 $14,344 $13,355 $16,186 $17,091 $20,880 Fidelity Freedom 2050 Composite Index℠ $10,000 $9,871 $9,004 $13,506 $14,232 $13,186 $15,842 $16,880 $20,099 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class K6 22.17% 8.55% 10.20% Fidelity Freedom 2050 Composite Index℠ 19.07% 8.27% 9.64% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit www.401k.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.401k.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 3,689,428,934 | $ 3,689,428,934 | $ 3,689,428,934 | $ 3,689,428,934 | $ 3,689,428,934 | |||||||||||||||
| Holdings Count | shares | 41 | 41 | 41 | 41 | 41 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 9,358,090 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 16.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Domestic Equity Funds 55.0 International Equity Funds 40.8 Bond Funds 3.9 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 55.0 International Equity Funds - 40.8 Bond Funds - 3.9 Short-Term Investments and Net Other Assets (Liabilities) - 0.3 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 15.3 Fidelity Series Blue Chip Growth Fund 12.9 Fidelity Series Emerging Markets Opportunities Fund 10.4 Fidelity Series Large Cap Growth Index Fund 8.2 Fidelity Series Large Cap Stock Fund 8.0 Fidelity Series Overseas Fund 6.7 Fidelity Series International Value Fund 6.7 Fidelity Series International Growth Fund 6.7 Fidelity Series Value Discovery Fund 5.4 Fidelity Series Canada Fund 4.0 84.3 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
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| Material Fund Change Expenses [Text Block] | The fees associated with this class changed during the reporting year. The variations in class fees are primarily the result of the following changes:
The fund's contractual management fee was reduced during the reporting period.
Effective June 1, 2025, the fund's expense contract was amended to reduce its total expenses.
|
|||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-835-5092</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Freedom Blend 2010 Fund - Class K6 | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2010 Fund | |||||||||||||||||||
| Class Name | Fidelity Freedom® Blend 2010 Fund Class K6 | |||||||||||||||||||
| Trading Symbol | FHPDX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2010 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-835-5092 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
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| Expenses Paid, Amount | $ 22 | |||||||||||||||||||
| Expense Ratio, Percent | 0.21% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
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| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Class K6 $10,000 $10,152 $10,107 $12,189 $12,156 $11,546 $12,392 $13,073 $14,293 Fidelity Freedom 2010 Composite Index℠ $10,000 $10,147 $10,290 $12,077 $12,146 $11,556 $12,434 $13,135 $14,196 Bloomberg U.S. Aggregate Bond Index $10,000 $10,395 $11,324 $11,404 $10,931 $10,408 $10,585 $11,101 $11,584 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class K6 9.34% 3.24% 4.82% Fidelity Freedom 2010 Composite Index℠ 8.08% 3.28% 4.73% Bloomberg U.S. Aggregate Bond Index 4.35% 0.31% 1.96% A From August 31, 2018 Visit www.401k.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.401k.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 203,748,419 | $ 203,748,419 | $ 203,748,419 | $ 203,748,419 | $ 203,748,419 | |||||||||||||||
| Holdings Count | shares | 46 | 46 | 46 | 46 | 46 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 441,074 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 28.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Bond Funds 59.4 Domestic Equity Funds 17.9 International Equity Funds 16.0 Short-Term Funds 6.5 Short-Term Investments and Net Other Assets (Liabilities) 0.2 ASSET ALLOCATION (% of Fund's net assets) Bond Funds - 59.4 Domestic Equity Funds - 17.9 International Equity Funds - 16.0 Short-Term Funds - 6.5 Short-Term Investments and Net Other Assets (Liabilities) - 0.2 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 17.8 Fidelity Series Government Bond Index Fund 10.4 Fidelity Series Investment Grade Bond Fund 9.7 Fidelity Series Corporate Bond Fund 6.2 Fidelity Series Investment Grade Securitized Fund 5.8 Fidelity Series International Developed Markets Bond Index Fund 4.8 Fidelity Series Large Cap Value Index Fund 4.6 Fidelity Series Emerging Markets Opportunities Fund 4.2 Fidelity Series Blue Chip Growth Fund 3.9 Fidelity Series Treasury Bill Index Fund 3.8 71.2 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
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| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period.
Effective June 1, 2025, the fund's expense contract was amended to reduce its total expenses.
|
|||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
|||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-835-5092</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Freedom Blend Retirement Fund- Class I | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend Retirement Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend Retirement Fund Class I | |||||||||||||||||||
| Trading Symbol | FHAJX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend Retirement Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
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| Expenses Paid, Amount | $ 43 | |||||||||||||||||||
| Expense Ratio, Percent | 0.41% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
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| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Class I $10,000 $10,214 $10,393 $11,673 $11,549 $11,038 $11,652 $12,258 $13,258 Fidelity Freedom Retirement Composite Index℠ $10,000 $10,223 $10,623 $11,687 $11,652 $11,208 $11,896 $12,555 $13,448 Bloomberg U.S. Aggregate Bond Index $10,000 $10,395 $11,324 $11,404 $10,931 $10,408 $10,585 $11,101 $11,584 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class I 8.16% 2.58% 3.79% Fidelity Freedom Retirement Composite Index℠ 7.11% 2.85% 3.98% Bloomberg U.S. Aggregate Bond Index 4.35% 0.31% 1.96% A From August 31, 2018 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 217,536,466 | $ 217,536,466 | $ 217,536,466 | $ 217,536,466 | $ 217,536,466 | |||||||||||||||
| Holdings Count | shares | 47 | 47 | 47 | 47 | 47 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 491,972 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 38.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
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| Holdings [Text Block] | Bond Funds 61.3 Domestic Equity Funds 16.3 International Equity Funds 14.7 Short-Term Funds 7.4 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) Bond Funds - 61.3 Domestic Equity Funds - 16.3 International Equity Funds - 14.7 Short-Term Funds - 7.4 Short-Term Investments and Net Other Assets (Liabilities) - 0.3 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 20.4 Fidelity Series Government Bond Index Fund 10.7 Fidelity Series Investment Grade Bond Fund 9.9 Fidelity Series Corporate Bond Fund 6.4 Fidelity Series Investment Grade Securitized Fund 6.0 Fidelity Series International Developed Markets Bond Index Fund 4.8 Fidelity Series Treasury Bill Index Fund 4.3 Fidelity Series Large Cap Value Index Fund 4.1 Fidelity Series Emerging Markets Opportunities Fund 3.9 Fidelity Series Blue Chip Growth Fund 3.5 74.0 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
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| Material Fund Change Name [Text Block] | The fund's name changed from Fidelity Freedom® Blend Income Fund to Fidelity Freedom® Blend Retirement Fund during the reporting period. | |||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period.
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| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period. | |||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2035 Fund - Class C | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2035 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2035 Fund Class C | |||||||||||||||||||
| Trading Symbol | FHVCX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2035 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
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| Expenses Paid, Amount | $ 159 | |||||||||||||||||||
| Expense Ratio, Percent | 1.47% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
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| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Class C $10,000 $9,844 $8,905 $13,201 $13,381 $12,330 $14,259 $14,854 $17,237 Fidelity Freedom 2035 Composite Index℠ $10,000 $9,897 $9,181 $13,259 $13,817 $12,836 $14,933 $15,853 $18,246 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class C (incl. contingent deferred sales charge) 15.04% 5.48% 7.44% Class C 16.04% 5.48% 7.44% Fidelity Freedom 2035 Composite Index℠ 15.09% 6.59% 8.25% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 4,774,644,697 | $ 4,774,644,697 | $ 4,774,644,697 | $ 4,774,644,697 | $ 4,774,644,697 | |||||||||||||||
| Holdings Count | shares | 48 | 48 | 48 | 48 | 48 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 12,522,295 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 18.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
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| Holdings [Text Block] | Domestic Equity Funds 39.8 International Equity Funds 30.9 Bond Funds 28.9 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 39.8 International Equity Funds - 30.9 Bond Funds - 28.9 Short-Term Investments and Net Other Assets (Liabilities) - 0.4 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 11.0 Fidelity Series Blue Chip Growth Fund 9.2 Fidelity Series Emerging Markets Opportunities Fund 7.9 Fidelity Series Large Cap Growth Index Fund 5.9 Fidelity Series Large Cap Stock Fund 5.8 Fidelity Series Government Bond Index Fund 5.4 Fidelity Series Investment Grade Bond Fund 5.2 Fidelity Series Overseas Fund 5.0 Fidelity Series International Value Fund 5.0 Fidelity Series International Growth Fund 5.0 65.4 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
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| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
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| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> | |||||||||||||||||||
| Fidelity Advisor Freedom Blend 2040 Fund - Class I | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Fidelity Freedom® Blend 2040 Fund | |||||||||||||||||||
| Class Name | Fidelity Advisor Freedom® Blend 2040 Fund Class I | |||||||||||||||||||
| Trading Symbol | FHJFX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity Freedom® Blend 2040 Fund for the period April 1, 2025 to March 31, 2026. | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||||||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||||||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||||||||||||
| Expenses [Text Block] | What were your Fund costs for the last year?
(based on hypothetical $10,000 investment)
FUND COST (PREVIOUS YEAR)
|
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| Expenses Paid, Amount | $ 52 | |||||||||||||||||||
| Expense Ratio, Percent | 0.47% | |||||||||||||||||||
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period?
•Global risk assets posted strong gains for the 12 months ending March 31, 2026, supported by healthy corporate fundamentals in several regions, a resilient global economy, robust corporate spending on artificial intelligence and dovish monetary policy from some central banks, though momentum faded in late February, as conflict in the Middle East took center stage.
•Against this backdrop, an overweight positioning in non-U.S. equities and investment performance among the underlying U.S. equity portfolios notably contributed to the fund's performance versus the composite index for the fiscal year. Also helping on a relative basis was an out-of-composite allocation to commodities and lighter-than-composite exposure to U.S. investment-grade bonds.
•Within U.S. equities, an investment in Fidelity® Series Blue Chip Growth Fund (+29.01%) meaningfully boosted the Fund's relative result, given it outperformed its benchmark, the Russell 1000® Growth Index (+18.81%), for the 12 months. Fidelity Series® Large Cap Stock Fund (+29.19%) also stood out, significantly outperforming its benchmark, the S&P 500® index (+17.80%).
•Investment performance within emerging-markets equities also added relative value. Specifically, an investment in Fidelity® Series Emerging Markets Opportunities Fund (+39.58%) outpaced the MSCI Emerging Markets Index (+29.53%).
•In contrast, the performance of the underlying non-U.S. developed-markets equities funds detracted from the Fund's relative result. Here, Fidelity® Series Overseas Fund (+10.87%) lagged its benchmark, the MSCI EAFE Index (+21.61%).
•An underweight allocation to U.S. equities also hurt the Fund's relative performance, along with an overweight in long-term U.S. Treasury bonds.
|
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| Performance Past Does Not Indicate Future [Text] | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> | |||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE August 31, 2018 through March 31, 2026. Initial investment of $10,000. Class I $10,000 $9,867 $8,864 $13,803 $14,250 $13,238 $15,871 $16,739 $20,112 Fidelity Freedom 2040 Composite Index℠ $10,000 $9,871 $9,004 $13,506 $14,229 $13,178 $15,712 $16,727 $19,689 S&P 500® Index $10,000 $9,884 $9,195 $14,376 $16,625 $15,340 $19,924 $21,568 $25,408 2018 2019 2020 2021 2022 2023 2024 2025 2026 | |||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class I 20.15% 7.82% 9.65% Fidelity Freedom 2040 Composite Index℠ 17.71% 7.83% 9.35% S&P 500® Index 17.80% 12.06% 13.08% A From August 31, 2018 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Performance Inception Date | Aug. 31, 2018 | |||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit institutional.fidelity.com for more recent performance information. | |||||||||||||||||||
| Net Assets | $ 4,622,181,262 | $ 4,622,181,262 | $ 4,622,181,262 | $ 4,622,181,262 | $ 4,622,181,262 | |||||||||||||||
| Holdings Count | shares | 48 | 48 | 48 | 48 | 48 | |||||||||||||||
| Advisory Fees Paid, Amount | $ 11,983,334 | |||||||||||||||||||
| Investment Company Portfolio Turnover | 18.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of March 31, 2026)
|
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| Holdings [Text Block] | Domestic Equity Funds 48.6 International Equity Funds 36.7 Bond Funds 14.3 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets) Domestic Equity Funds - 48.6 International Equity Funds - 36.7 Bond Funds - 14.3 Short-Term Investments and Net Other Assets (Liabilities) - 0.4 | |||||||||||||||||||
| Largest Holdings [Text Block] | TOP HOLDINGS(% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 13.5 Fidelity Series Blue Chip Growth Fund 11.4 Fidelity Series Emerging Markets Opportunities Fund 9.4 Fidelity Series Large Cap Growth Index Fund 7.2 Fidelity Series Large Cap Stock Fund 7.1 Fidelity Series Overseas Fund 6.0 Fidelity Series International Value Fund 6.0 Fidelity Series International Growth Fund 6.0 Fidelity Series Value Discovery Fund 4.8 Fidelity Series Long-Term Treasury Bond Index Fund 4.2 75.6 | |||||||||||||||||||
| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
|
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| Material Fund Change Expenses [Text Block] | The fund's contractual management fee was reduced during the reporting period. | |||||||||||||||||||
| Material Fund Change Strategies [Text Block] | The fund modified its principal investment strategies during the reporting period.
|
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| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 30, 2026 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||||||||||||
| Updated Prospectus Phone Number | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> |