Shareholder Report |
12 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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May 31, 2026
USD ($)
Holding
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| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Document Type | N-CSR | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Amendment Flag | false | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Registrant Name | VALIC Co I | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Entity Central Index Key | 0000719423 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Entity Investment Company Type | N-1A | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Document Period End Date | May 31, 2026 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| C000021763 [Member] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | Asset Allocation | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Asset Allocation | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | VCAAX | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the VALIC Company I Asset Allocation Fund (the “Fund”) for the period of June 1, 2025 to May 31, 2026. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by contacting us at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period.
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| Additional Information Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] | Fund Expenses What were the Fund costs for the last year ? (Based on a hypothetical $10,000 investment)
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| Expenses Paid, Amount | $ 71 | [1] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.66% | [1] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS The Fund posted a return of 15.10% for the year ended May 31, 2026, compared to 29.78% for the S&P 500® Index (a broad-based securities market index) and 19.53% for the Blended Index (the "Performance Index") comprised of 60% S&P 500® Index; 40% Bloomberg U.S. Aggregate Bond Index. Over the period, U.S. small-cap equities outperformed large-cap equities. Treasury market volatility, already elevated in the second half of 2025 amid tariff-driven growth-inflation tensions and a weakening labor market, intensified in 2026 as Middle East conflict sparked an oil price surge, triggering a steep U.S. Treasury sell-off and pushing 10-year yields to multi-year highs. The mortgage-backed securities markets continued to grind tighter throughout late 2025 before experiencing significant volatility and widening in 2026. The credit market spreads continued to grind tighter post Liberation Day peaks before experiencing modest widening during the Middle East conflict. The following is a summary of the top contributors and detractors that impacted the Fund's performance during the year relative to the Performance Index. TOP PERFORMANCE CONTRIBUTORS For the equity segment of the fund | Allocations in the following sectors: consumer staples; telecommunications; consumer cyclical. Security selection in the following sectors: commodities; software & services; consumer cyclical. Position weightings: Alphabet, Inc., Class A; Baker Hughes Co.; NXP Semiconductors NV For the fixed income segment of the fund | Allocations in the following sectors: U.S. Treasuries; non-agency mortgage-backed securities; agency mortgage-backed securities. Security selection in the following sectors: asset-backed securities; corporate credit; U.S. Treasuries TOP PERFORMANCE DETRACTORS For the equity segment of the fund | Allocations in the following sectors: non-bank financials; retail; commodities. Security selection in the following sectors: semiconductors & hardware; non-bank financials; payments & business services. Position Weightings: Arthur J. Gallagher & Co., Intuit, Inc.; Mastercard, Inc., Class A For the fixed income segment of the fund | Allocations in the following sectors: asset-backed securities; corporate credit; cash. Security selection in the following sectors: agency mortgage-backed securities; commercial mortgage-backed securities
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| Performance Past Does Not Indicate Future [Text] | The Fund ’s past performance is not a good predictor of how the Fund will perform in the future. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] | Fund Performance The following graph compares a $10,000 initial investment in the Fund to the index(es) listed below for the last 10 fiscal years of the Fund. GROWTH OF $10,000 |
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| Average Annual Return [Table Text Block] |
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| 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. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Jan. 01, 2026 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 149,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 634 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 700,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 38.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics The following table outlines key fund statistics.
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| Holdings [Text Block] | Graphical Representation of Holdings The information below represents the composition of the Fund's net assets as of the end of the period. Top Industries*
Portfolio Composition * Percentages exclude derivatives (other than purchased options), if any.
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| Material Fund Change [Text Block] | Material Fund Changes This is a summary of certain changes to the Fund since the beginning of the period. Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. Additionally, on March 26, 2026, Corebridge Financial, Inc. and Equitable Holdings, Inc. (“EQH”) announced that they have entered into a definitive agreement to merge (the “Transaction”). The Transaction is expected to close by the end of 2026, subject to customary closing conditions, including the receipt of requisite regulatory approvals and approval of the shareholders of both Corebridge Financial, Inc. and EQH. Under the 1940 Act, an investment advisory agreement between a registered investment company, such as VC I, and its investment adviser must include a provision providing for its automatic termination upon its “assignment” (as defined in the 1940 Act). The closing of the Transaction may be deemed to cause an “assignment” of the Investment Advisory Agreement between VC I, on behalf of each Fund, and VALIC. As a result, the closing of the Transaction may cause the Investment Advisory Agreement to terminate automatically in accordance with its terms. It is anticipated that, prior to the closing of the Transaction, VC I’s Board of Directors (the “Board”) will consider a new investment advisory agreement between VC I, on behalf of each Fund, and VALIC. If approved by the Board, the new investment advisory agreement will be presented to the Funds’ shareholders for approval, and, if approved by shareholders, it will take effect upon the closing of the Transaction. For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542.
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| Material Fund Change Adviser [Text Block] | Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Accountant Change Disagreements [Text Block] | Changes in and Disagreements with Accountants There were no changes in or disagreements with the accountants during the period.
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| C000021764 [Member] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | International Equities Index | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | International Equities Index | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | VCIEX | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the VALIC Company I International Equities Index Fund (the “Fund”) for the period of June 1, 2025 to May 31, 2026. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by contacting us at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period.
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| Additional Information Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] | Fund Expenses What were the Fund costs for the last year ? (Based on a hypothetical $10,000 investment)
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| Expenses Paid, Amount | $ 44 | [2] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.40% | [2] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS The Fund is managed to seek to track the performance of the Index. The Subadviser may endeavor to track the Index by purchasing every stock included in the Index, in the same proportions; or, in the alternative, the Subadviser may invest in a sampling of Index stocks by utilizing a statistical technique known as "optimization". The Fund posted a return of 22.40% for the year ended May 31, 2026, compared to a return of 22.80% for the MSCI EAFE Index (net) (a broad-based securities market & "Performance Index"). Over the period, developed international equities advanced but trailed the strongest U.S. growth-oriented and technology-heavy benchmarks. International equities outpaced weaker U.S. mid-cap growth benchmarks. The following is a summary of the top contributors and detractors that impacted the Fund's performance during the year. TOP PERFORMANCE CONTRIBUTORS Allocations in the following sectors | financials; information technology, industrials Position weightings | ASML Holding NV; HSBC Holdings PLC; SoftBank Group Corp. Exposure to the following countries | Japan; United Kingdom; Netherlands TOP PERFORMANCE DETRACTORS Allocations in the following sectors | none Position weightings | SAP SE; Novo Nordisk A/S, Class B; CSL, Ltd. Exposure to the following countries | Denmark
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| Performance Past Does Not Indicate Future [Text] | The Fund ’s past performance is not a good predictor of how the Fund will perform in the future. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] | Fund Performance The following graph compares a $10,000 initial investment in the Fund to the index(es) listed below for the last 10 fiscal years of the Fund. GROWTH OF $10,000 |
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| Average Annual Return [Table Text Block] |
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| 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. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Jan. 01, 2026 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 2,180,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 685 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 5,100,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 29.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics The following table outlines key fund statistics.
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| Holdings [Text Block] | Graphical Representation of Holdings The information below represents the composition of the Fund's net assets as of the end of the period. Top Industries*
Portfolio Composition Country * Percentages exclude derivatives (other than purchased options), if any.
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| Material Fund Change [Text Block] | Material Fund Changes This is a summary of certain changes to the Fund since the beginning of the period. Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. Additionally, on March 26, 2026, Corebridge Financial, Inc. and Equitable Holdings, Inc. (“EQH”) announced that they have entered into a definitive agreement to merge (the “Transaction”). The Transaction is expected to close by the end of 2026, subject to customary closing conditions, including the receipt of requisite regulatory approvals and approval of the shareholders of both Corebridge Financial, Inc. and EQH. Under the 1940 Act, an investment advisory agreement between a registered investment company, such as VC I, and its investment adviser must include a provision providing for its automatic termination upon its “assignment” (as defined in the 1940 Act). The closing of the Transaction may be deemed to cause an “assignment” of the Investment Advisory Agreement between VC I, on behalf of each Fund, and VALIC. As a result, the closing of the Transaction may cause the Investment Advisory Agreement to terminate automatically in accordance with its terms. It is anticipated that, prior to the closing of the Transaction, VC I’s Board of Directors (the “Board”) will consider a new investment advisory agreement between VC I, on behalf of each Fund, and VALIC. If approved by the Board, the new investment advisory agreement will be presented to the Funds’ shareholders for approval, and, if approved by shareholders, it will take effect upon the closing of the Transaction. Effective September 29, 2025, the Fund entered into a contractual advisory fee waiver agreement with VALIC to lower the advisory fee rate payable by the Fund to VALIC to 0.315% of the Fund’s average daily net assets on the first $500 million, 0.215% of the Fund’s average daily net assets on the next $500 million, and 0.205% of the Fund’s average daily net assets over $1 billion. For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542.
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| Material Fund Change Expenses [Text Block] | Effective September 29, 2025, the Fund entered into a contractual advisory fee waiver agreement with VALIC to lower the advisory fee rate payable by the Fund to VALIC to 0.315% of the Fund’s average daily net assets on the first $500 million, 0.215% of the Fund’s average daily net assets on the next $500 million, and 0.205% of the Fund’s average daily net assets over $1 billion. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Adviser [Text Block] | Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Accountant Change Disagreements [Text Block] | Changes in and Disagreements with Accountants There were no changes in or disagreements with the accountants during the period.
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| C000021765 [Member] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | International Government Bond | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | International Government Bond | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | VCIFX | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the VALIC Company I International Government Bond Fund (the “Fund”) for the period of June 1, 2025 to May 31, 2026. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by contacting us at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period.
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| Additional Information Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] | Fund Expenses What were the Fund costs for the last year ? (Based on a hypothetical $10,000 investment)
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| Expenses Paid, Amount | $ 80 | [3] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.78% | [3] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS The Fund posted a return of 4.75% for the year ended May 31, 2026, compared to 3.77% for the Bloomberg Global Aggregate Index (USD hedged) (a broad-based securities market index) and 5.76% for the Blended Index (the "Performance Index") comprised of 70% FTSE WGBI Index (unhedged); 30% JPMorgan EMBI Global Diversified Index. Global bonds delivered positive total returns over the past twelve months, despite geopolitical volatility in global bond yields. Hard currency emerging market bonds outperformed. The following is a summary of the top contributors and detractors that impacted the Fund's performance during the year relative to the Performance Index. TOP PERFORMANCE CONTRIBUTORS In aggregate | position weightings Exposure to the following countries | Angola; Zambia; Ecuador TOP PERFORMANCE DETRACTORS In aggregate | country allocations; yield curve Exposure to the following countries | lack of exposure to Venezuela; United States; lack of exposure to Ukraine
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| Performance Past Does Not Indicate Future [Text] | The Fund ’s past performance is not a good predictor of how the Fund will perform in the future. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] | Fund Performance The following graph compares a $10,000 initial investment in the Fund to the index(es) listed below for the last 10 fiscal years of the Fund. GROWTH OF $10,000 |
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| Average Annual Return [Table Text Block] |
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| 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. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Jan. 01, 2026 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 55,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 146 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 300,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 186.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics The following table outlines key fund statistics.
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| Holdings [Text Block] | Graphical Representation of Holdings The information below represents the composition of the Fund as of the end of the period. Top Industries* (% of net assets)
Country (% of net assets) Credit Quality ** (% of total debt issues) * Percentages exclude derivatives (other than purchased options), if any. ** Credit quality ratings shown above reflect the rating assigned by Moody's Investors Service, Inc. Where Moody's ratings are not available, we have used Standard & Poor's ratings. Unrated investments do not necessarily indicate low credit quality. Credit quality ratings are subject to change. Percentages exclude short-term securities.
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| Credit Quality Explanation [Text Block] | Credit quality ratings shown above reflect the rating assigned by Moody's Investors Service, Inc. Where Moody's ratings are not available, we have used Standard & Poor's ratings. Unrated investments do not necessarily indicate low credit quality. Credit quality ratings are subject to change. Percentages exclude short-term securities. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Credit Ratings Selection [Text Block] | Credit quality ratings shown above reflect the rating assigned by Moody's Investors Service, Inc. Where Moody's ratings are not available, we have used Standard & Poor's ratings. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change [Text Block] | Material Fund Changes This is a summary of certain changes to the Fund since the beginning of the period. Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. Additionally, on March 26, 2026, Corebridge Financial, Inc. and Equitable Holdings, Inc. (“EQH”) announced that they have entered into a definitive agreement to merge (the “Transaction”). The Transaction is expected to close by the end of 2026, subject to customary closing conditions, including the receipt of requisite regulatory approvals and approval of the shareholders of both Corebridge Financial, Inc. and EQH. Under the 1940 Act, an investment advisory agreement between a registered investment company, such as VC I, and its investment adviser must include a provision providing for its automatic termination upon its “assignment” (as defined in the 1940 Act). The closing of the Transaction may be deemed to cause an “assignment” of the Investment Advisory Agreement between VC I, on behalf of each Fund, and VALIC. As a result, the closing of the Transaction may cause the Investment Advisory Agreement to terminate automatically in accordance with its terms. It is anticipated that, prior to the closing of the Transaction, VC I’s Board of Directors (the “Board”) will consider a new investment advisory agreement between VC I, on behalf of each Fund, and VALIC. If approved by the Board, the new investment advisory agreement will be presented to the Funds’ shareholders for approval, and, if approved by shareholders, it will take effect upon the closing of the Transaction. Effective September 29, 2025, the Fund’s contractual advisory fee waiver was amended to lower the advisory fee rate payable by the Fund to VALIC to 0.44% of the Fund’s average daily net assets on the first $250 million, 0.39% of the Fund’s average daily net assets on the next $250 million, 0.34% of the Fund’s average daily net assets on the next $500 million, and 0.29% of the Fund’s average daily net assets over $1 billion. For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542.
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| Material Fund Change Expenses [Text Block] | Effective September 29, 2025, the Fund’s contractual advisory fee waiver was amended to lower the advisory fee rate payable by the Fund to VALIC to 0.44% of the Fund’s average daily net assets on the first $250 million, 0.39% of the Fund’s average daily net assets on the next $250 million, 0.34% of the Fund’s average daily net assets on the next $500 million, and 0.29% of the Fund’s average daily net assets over $1 billion. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Adviser [Text Block] | Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Accountant Change Disagreements [Text Block] | Changes in and Disagreements with Accountants There were no changes in or disagreements with the accountants during the period.
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| C000021766 [Member] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | International Growth | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | International Growth | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | VCINX | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the VALIC Company I International Growth Fund (the “Fund”) for the period of June 1, 2025 to May 31, 2026. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by contacting us at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period.
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| Additional Information Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] | Fund Expenses What were the Fund costs for the last year ? (Based on a hypothetical $10,000 investment)
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| Expenses Paid, Amount | $ 83 | [4] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.82% | [4] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS The Fund posted a return of 3.59% for the year ended May 31, 2026, compared to a return of 32.77% for the MSCI ACWI ex USA Index (net) (a broad-based securities market & "Performance Index"). International equities advanced during the 12-month period despite heightened geopolitical uncertainty. Equity markets were broadly supported by enthusiasm surrounding artificial intelligence advancements and expectations of more accommodative monetary policy. The following is a summary of the top contributors and detractors that impacted the Fund's performance during the year relative to the Performance Index. TOP PERFORMANCE CONTRIBUTORS Allocations in the following sectors | information technology; health care; financials Security selection in the following sectors | consumer staples Position weightings | ASML Holding NV; Taiwan Semiconductor Manufacturing Co., Ltd.; Keyence Corp. Exposure to the following countries | lack of exposure to China; Netherlands; Taiwan TOP PERFORMANCE DETRACTORS In aggregate | position weightings; country allocations; sector allocations Allocations in the following sectors | consumer discretionary; communication services; lack of allocation in materials Security selection in the following sectors | financials; information technology; consumer discretionary Position weightings | Hermes International S.C.A.; MercadoLibre, Inc.; Spotify Technology SA Exposure to the following countries | France; lack of exposure to South Korea; Sweden
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| Performance Past Does Not Indicate Future [Text] | The Fund ’s past performance is not a good predictor of how the Fund will perform in the future. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] | Fund Performance The following graph compares a $10,000 initial investment in the Fund to the index(es) listed below for the last 10 fiscal years of the Fund. GROWTH OF $10,000 |
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| Average Annual Return [Table Text Block] |
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| 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. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Jan. 01, 2026 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 342,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 31 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 2,400,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 15.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics The following table outlines key fund statistics.
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| Holdings [Text Block] | Graphical Representation of Holdings The information below represents the composition of the Fund's net assets as of the end of the period. Top Industries*
Portfolio Composition Country * Percentages exclude derivatives (other than purchased options), if any.
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| Material Fund Change [Text Block] | Material Fund Changes This is a summary of certain changes to the Fund since the beginning of the period. Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. Additionally, on March 26, 2026, Corebridge Financial, Inc. and Equitable Holdings, Inc. (“EQH”) announced that they have entered into a definitive agreement to merge (the “Transaction”). The Transaction is expected to close by the end of 2026, subject to customary closing conditions, including the receipt of requisite regulatory approvals and approval of the shareholders of both Corebridge Financial, Inc. and EQH. Under the 1940 Act, an investment advisory agreement between a registered investment company, such as VC I, and its investment adviser must include a provision providing for its automatic termination upon its “assignment” (as defined in the 1940 Act). The closing of the Transaction may be deemed to cause an “assignment” of the Investment Advisory Agreement between VC I, on behalf of each Fund, and VALIC. As a result, the closing of the Transaction may cause the Investment Advisory Agreement to terminate automatically in accordance with its terms. It is anticipated that, prior to the closing of the Transaction, VC I’s Board of Directors (the “Board”) will consider a new investment advisory agreement between VC I, on behalf of each Fund, and VALIC. If approved by the Board, the new investment advisory agreement will be presented to the Funds’ shareholders for approval, and, if approved by shareholders, it will take effect upon the closing of the Transaction. For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542.
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| Material Fund Change Adviser [Text Block] | Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Accountant Change Disagreements [Text Block] | Changes in and Disagreements with Accountants There were no changes in or disagreements with the accountants during the period.
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| C000021768 [Member] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | Large Cap Core | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Large Cap Core | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | VLCGX | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the VALIC Company I Large Cap Core Fund (the “Fund”) for the period of June 1, 2025 to May 31, 2026. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by contacting us at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] |
This report describes changes to the Fund that occurred during the reporting period.
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| Additional Information Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] |
Fund Expenses
What were the Fund costs for the last year ?
(Based on a hypothetical $10,000 investment)
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| Expenses Paid, Amount | $ 76 | [5] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.69% | [5] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] |
Management’s Discussion of Fund Performance
SUMMARY OF RESULTS
The Fund posted a return of 20.29% for the year ended May 31, 2026, compared to a return of 29.78% for the S&P 500® Index (a broad-based securities market & "Performance Index") and 28.66% for the Russell 1000® Growth Index (prior Performance Index). Over the period, U.S. large-cap equities underperformed small-cap equities significantly, according to the Russell® family of indices. In terms of style factors, value remained flat with respect to growth.
TOP PERFORMANCE CONTRIBUTORS
Massachusetts Financial Services Company - see Material Fund Changes for the time period covered | Allocations in the following sectors: consumer discretionary; utilities; energy. Security selection in the following sectors: consumer staples, communication services; health care. Position weightings: Taiwan Semiconductor Manufacturing Co., Ltd.; lack of position in Costco Wholesale Corp.; Amphenol Corp., Class A
J.P. Morgan Investment Management, Inc. - see Material Fund Changes for the time period covered | Allocations in the following sectors: consumer staples; real estate; materials. Security selection in the following sectors: utilities; real estate; consumer staples. Position weightings: Netflix, Inc.; NXP Semiconductors NV; Berkshire Hathaway, Inc., Class B
T. Rowe Price Associates, Inc. - see Material Fund Changes for the time period covered | Allocations in the following sectors: information technology; real estate; consumer staples. Security selection in the following sectors: financials; industrials and business services; consumer discretionary. Position weightings: Seagate Technology Holdings PLC; Keysight Technologies, Inc.; Vertiv Holdings Co., Class A
TOP PERFORMANCE DETRACTORS
Massachusetts Financial Services Company - see Material Fund Changes for the time period covered | In aggregate: sector allocations; position weightings. Allocations in the following sectors: financials; consumer staples; information technology. Security selection in the following sectors: information technology; financials; utilities. Position weightings: Accenture PLC, Class A; NVIDIA Corp.; lack of position in Broadcom, Inc.
J.P. Morgan Investment Management, Inc. - see Material Fund Changes for the time period covered | In aggregate: position weightings; sector allocations. Allocations in the following sectors: financials; consumer discretionary; utilities. Security selection in the following sectors: information technology; financials; health care. Position weightings: Intuit, Inc.; Arthur J. Gallagher & Co.; Blackstone, Inc.
T. Rowe Price Associates, Inc. - see Material Fund Changes for the time period covered | Allocations in the following sectors: financials; communication services; health care. Security selection in the following sectors: information technology; health care; communication services. Position weightings: Microsoft Corp., T-Mobile US, Inc., Applied Materials, Inc.
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| Performance Past Does Not Indicate Future [Text] | The Fund ’s past performance is not a good predictor of how the Fund will perform in the future. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] |
Fund Performance
The following graph compares a $10,000 initial investment in the Fund to the index(es) listed below for the last 10 fiscal years of the Fund.
GROWTH OF $10,000
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| Average Annual Return [Table Text Block] |
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| 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. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Jan. 01, 2026 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 819,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 319 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 4,000,000.0 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 112.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] |
Key Fund Statistics
The following table outlines key fund statistics.
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| Holdings [Text Block] |
Graphical Representation of Holdings
The information below represents the composition of the Fund's net assets as of the end of the period.
Top Industries*
Portfolio Composition
* Percentages exclude derivatives (other than purchased options), if any.
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| Material Fund Change [Text Block] |
Material Fund Changes
This is a summary of certain changes to the Fund since the beginning of the period. Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. Additionally, on March 26, 2026, Corebridge Financial, Inc. and Equitable Holdings, Inc. (“EQH”) announced that they have entered into a definitive agreement to merge (the “Transaction”). The Transaction is expected to close by the end of 2026, subject to customary closing conditions, including the receipt of requisite regulatory approvals and approval of the shareholders of both Corebridge Financial, Inc. and EQH. Under the 1940 Act, an investment advisory agreement between a registered investment company, such as VC I, and its investment adviser must include a provision providing for its automatic termination upon its “assignment” (as defined in the 1940 Act). The closing of the Transaction may be deemed to cause an “assignment” of the Investment Advisory Agreement between VC I, on behalf of each Fund, and VALIC. As a result, the closing of the Transaction may cause the Investment Advisory Agreement to terminate automatically in accordance with its terms. It is anticipated that, prior to the closing of the Transaction, VC I’s Board of Directors (the “Board”) will consider a new investment advisory agreement between VC I, on behalf of each Fund, and VALIC. If approved by the Board, the new investment advisory agreement will be presented to the Funds’ shareholders for approval, and, if approved by shareholders, it will take effect upon the closing of the Transaction.
Effective September 29, 2025, J.P. Morgan Investment Management, Inc. and T. Rowe Price Associates, Inc. were appointed as subadvisers to the Fund, replacing the existing subadviser, Massachusetts Financial Services Company. Additionally, the Fund’s investment strategies, techniques and benchmark index were revised to reflect the investment strategies and techniques used by the new subadvisers. As a result, Depositary Receipts Risk, Derivatives Risk, Futures Risk, Sector Risk, and Technology Risk were added as principal risks, and Currency Risk and Focused Fund Risk were removed as principal risks. Additionally, effective September 29, 2025, the Fund’s contractual advisory fee waiver was amended to lower the advisory fee rate payable by the Fund to VALIC to 0.55% of the Fund’s average daily net assets on the first $750 million and 0.50% of the Fund’s average daily net assets over $750 million. In addition, the Fund changed its name from the “Large Capital Growth Fund” to the “Large Cap Core Fund.” For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542.
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| Material Fund Change Name [Text Block] | In addition, the Fund changed its name from the “Large Capital Growth Fund” to the “Large Cap Core Fund.” | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Expenses [Text Block] | Additionally, effective September 29, 2025, the Fund’s contractual advisory fee waiver was amended to lower the advisory fee rate payable by the Fund to VALIC to 0.55% of the Fund’s average daily net assets on the first $750 million and 0.50% of the Fund’s average daily net assets over $750 million. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Strategies [Text Block] | Additionally, the Fund’s investment strategies, techniques and benchmark index were revised to reflect the investment strategies and techniques used by the new subadvisers. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Risks Change [Text Block] | As a result, Depositary Receipts Risk, Derivatives Risk, Futures Risk, Sector Risk, and Technology Risk were added as principal risks, and Currency Risk and Focused Fund Risk were removed as principal risks. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Adviser [Text Block] | Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Accountant Change Disagreements [Text Block] |
Changes in and Disagreements with Accountants
There were no changes in or disagreements with the accountants during the period.
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| C000021769 [Member] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | Mid Cap Index | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Mid Cap Index | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | VMIDX | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the VALIC Company I Mid Cap Index Fund (the “Fund”) for the period of June 1, 2025 to May 31, 2026. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by contacting us at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period.
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| Additional Information Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] | Fund Expenses What were the Fund costs for the last year ? (Based on a hypothetical $10,000 investment)
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| Expenses Paid, Amount | $ 39 | [6] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.35% | [6] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS The Fund is managed to seek to track the performance of the Index. The Subadviser may endeavor to track the Index by purchasing every stock included in the Index, in the same proportions; or, in the alternative, the Subadviser may invest in a sampling of Index stocks by utilizing a statistical technique known as "optimization". The Fund posted a return of 25.52% for the year ended May 31, 2026, compared to a return of 29.45% for the Russell 3000® Index (a broad-based securities market index) and 25.88% for the S&P MidCap 400® Index (the "Performance Index"). Over the period, U.S. equities advanced, with technology-heavy and growth-oriented benchmarks leading the market. Smaller-cap equities also rose, while mid-cap growth lagged value-oriented benchmarks. The following is a summary of the top contributors and detractors that impacted the Fund's performance during the year. TOP PERFORMANCE CONTRIBUTORS Allocations in the following sectors | information technology; industrials; energy Position weightings | Lumentum Holdings, Inc.; Flex, Ltd.; Coherent Corp. TOP PERFORMANCE DETRACTORS Allocations in the following sectors | consumer staples Position weightings | Duolingo, Inc.; Sprouts Farmers Market, Inc.; DocuSign, Inc.
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| Performance Past Does Not Indicate Future [Text] | The Fund ’s past performance is not a good predictor of how the Fund will perform in the future. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] | Fund Performance The following graph compares a $10,000 initial investment in the Fund to the index(es) listed below for the last 10 fiscal years of the Fund. GROWTH OF $10,000 |
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| Average Annual Return [Table Text Block] |
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| 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. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Jan. 01, 2026 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 2,583,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 404 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 6,600,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 17.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics The following table outlines key fund statistics.
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| Holdings [Text Block] | Graphical Representation of Holdings The information below represents the composition of the Fund's net assets as of the end of the period. Top Industries*
Portfolio Composition * Percentages exclude derivatives (other than purchased options), if any.
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| Material Fund Change [Text Block] | Material Fund Changes This is a summary of certain changes to the Fund since the beginning of the period. Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. Additionally, on March 26, 2026, Corebridge Financial, Inc. and Equitable Holdings, Inc. (“EQH”) announced that they have entered into a definitive agreement to merge (the “Transaction”). The Transaction is expected to close by the end of 2026, subject to customary closing conditions, including the receipt of requisite regulatory approvals and approval of the shareholders of both Corebridge Financial, Inc. and EQH. Under the 1940 Act, an investment advisory agreement between a registered investment company, such as VC I, and its investment adviser must include a provision providing for its automatic termination upon its “assignment” (as defined in the 1940 Act). The closing of the Transaction may be deemed to cause an “assignment” of the Investment Advisory Agreement between VC I, on behalf of each Fund, and VALIC. As a result, the closing of the Transaction may cause the Investment Advisory Agreement to terminate automatically in accordance with its terms. It is anticipated that, prior to the closing of the Transaction, VC I’s Board of Directors (the “Board”) will consider a new investment advisory agreement between VC I, on behalf of each Fund, and VALIC. If approved by the Board, the new investment advisory agreement will be presented to the Funds’ shareholders for approval, and, if approved by shareholders, it will take effect upon the closing of the Transaction. Effective September 29, 2025, the Fund’s contractual advisory fee waiver was amended to lower the advisory fee rate payable by the Fund to VALIC to 0.335% of the Fund’s average daily net assets on the first $500 million, 0.235% of the Fund’s average daily net assets on the next $2.5 billion, 0.185% of the Fund’s average daily net assets on the next $2 billion, and 0.135% of the Fund’s average daily net assets over $5 billion. For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542.
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| Material Fund Change Expenses [Text Block] | Effective September 29, 2025, the Fund’s contractual advisory fee waiver was amended to lower the advisory fee rate payable by the Fund to VALIC to 0.335% of the Fund’s average daily net assets on the first $500 million, 0.235% of the Fund’s average daily net assets on the next $2.5 billion, 0.185% of the Fund’s average daily net assets on the next $2 billion, and 0.135% of the Fund’s average daily net assets over $5 billion. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Adviser [Text Block] | Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Accountant Change Disagreements [Text Block] | Changes in and Disagreements with Accountants There were no changes in or disagreements with the accountants during the period.
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| C000021770 [Member] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | Mid Cap Strategic Growth | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Mid Cap Strategic Growth | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | VMSGX | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the VALIC Company I Mid Cap Strategic Growth Fund (the “Fund”) for the period of June 1, 2025 to May 31, 2026. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by contacting us at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] |
This report describes changes to the Fund that occurred during the reporting period.
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| Additional Information Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] |
Fund Expenses
What were the Fund costs for the last year ?
(Based on a hypothetical $10,000 investment)
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| Expenses Paid, Amount | $ 80 | [7] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.73% | [7] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] |
Management’s Discussion of Fund Performance
SUMMARY OF RESULTS
The Fund posted a return of 19.00% for the year ended May 31, 2026, compared to a return of 29.45% for the Russell 3000® Index (a broad-based securities market index) and 7.88% for the Russell Midcap® Growth Index (the "Performance Index"). U.S. stocks rose over the period, fueled by healthy corporate earnings, enthusiasm around artificial intelligence (AI), and reduced tariff uncertainty. The economy was largely resilient, despite pockets of weakness and slowing employment growth. Markets experienced some volatility due to geopolitical tensions in the Middle East earlier in 2026, but this was followed by a recovery as risks of escalation eased and attention returned to company fundamentals.
The following is a summary, by subadviser, of the top contributors and detractors that impacted their portion of the Fund's performance during the year relative to the Performance Index.
TOP PERFORMANCE CONTRIBUTORS
Janus Henderson Investors US LLC | In aggregate: sector allocations; position weightings. Allocations in the following sectors: consumer discretionary; communication services; information technology. Security selection in the following sectors: information technology; health care; consumer discretionary. Position weightings: Flex, Ltd.; ON Semiconductor Corp.; JB Hunt Transport Services, Inc.
Voya Investment Management Co. LLC | In aggregate: position weightings; sector allocations. Allocations in the following sectors: industrials; communication services; consumer discretionary. Security selection in the following sectors: information technology; industrials; health care. Position weightings: Sandisk Corp.; Celestica, Inc.; Astera Labs, Inc.
TOP PERFORMANCE DETRACTORS
Janus Henderson Investors US LLC | Allocations in the following sectors: health care; energy; cash. Security selection in the following sectors: industrials; real estate; materials. Position weightings: lack of position in Vertiv Holdings Co., Class A; Constellation Software, Inc; lack of position in Rocket Lab Corp.
Voya Investment Management Co. LLC | Allocations in the following sectors: health care; cash; energy. Security selection in the following sectors: consumer staples; materials; real estate. Position weightings: Datadog, Inc., Class A; Wingstop, Inc.; Arthur J. Gallagher & Co.
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| Performance Past Does Not Indicate Future [Text] | The Fund ’s past performance is not a good predictor of how the Fund will perform in the future. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] |
Fund Performance
The following graph compares a $10,000 initial investment in the Fund to the index(es) listed below for the last 10 fiscal years of the Fund.
GROWTH OF $10,000
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| Average Annual Return [Table Text Block] |
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| 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. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Jan. 01, 2026 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 1,158,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 156 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 7,600,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 58.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] |
Key Fund Statistics
The following table outlines key fund statistics.
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| Holdings [Text Block] |
Graphical Representation of Holdings
The information below represents the composition of the Fund's net assets as of the end of the period.
Top Industries*
Portfolio Composition
* Percentages exclude derivatives (other than purchased options), if any.
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| Material Fund Change [Text Block] |
Material Fund Changes
This is a summary of certain changes to the Fund since the beginning of the period. Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. Additionally, on March 26, 2026, Corebridge Financial, Inc. and Equitable Holdings, Inc. (“EQH”) announced that they have entered into a definitive agreement to merge (the “Transaction”). The Transaction is expected to close by the end of 2026, subject to customary closing conditions, including the receipt of requisite regulatory approvals and approval of the shareholders of both Corebridge Financial, Inc. and EQH. Under the 1940 Act, an investment advisory agreement between a registered investment company, such as VC I, and its investment adviser must include a provision providing for its automatic termination upon its “assignment” (as defined in the 1940 Act). The closing of the Transaction may be deemed to cause an “assignment” of the Investment Advisory Agreement between VC I, on behalf of each Fund, and VALIC. As a result, the closing of the Transaction may cause the Investment Advisory Agreement to terminate automatically in accordance with its terms. It is anticipated that, prior to the closing of the Transaction, VC I’s Board of Directors (the “Board”) will consider a new investment advisory agreement between VC I, on behalf of each Fund, and VALIC. If approved by the Board, the new investment advisory agreement will be presented to the Funds’ shareholders for approval, and, if approved by shareholders, it will take effect upon the closing of the Transaction.
Effective September 29, 2025, the Fund’s investment strategies and techniques were revised to reflect the current investment strategies and techniques used by the Fund’s subadviser. As a result of these changes, ESG Investment Risk was added as a principal risk. For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542.
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| Material Fund Change Strategies [Text Block] | Effective September 29, 2025, the Fund’s investment strategies and techniques were revised to reflect the current investment strategies and techniques used by the Fund’s subadviser. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Risks Change [Text Block] | As a result of these changes, ESG Investment Risk was added as a principal risk. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Adviser [Text Block] | Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Accountant Change Disagreements [Text Block] |
Changes in and Disagreements with Accountants
There were no changes in or disagreements with the accountants during the period.
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| C000021772 [Member] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | Nasdaq-100® Index | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Nasdaq-100® Index | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | VCNIX | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the VALIC Company I Nasdaq-100® Index Fund (the “Fund”) for the period of June 1, 2025 to May 31, 2026. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by contacting us at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period.
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| Additional Information Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] | Fund Expenses What were the Fund costs for the last year ? (Based on a hypothetical $10,000 investment)
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| Expenses Paid, Amount | $ 51 | [8] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.42% | [8] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS The Fund is managed to seek to track the performance of the Index. The Subadviser may endeavor to track the Index by purchasing every stock included in the Index, in the same proportions; or, in the alternative, the Subadviser may invest in a sampling of Index stocks by utilizing a statistical technique known as "optimization". The Fund posted a return of 42.49% for the year ended May 31, 2026, compared to a return of 29.78% for the S&P 500® Index (a broad-based securities market index) and 43.09% for the Nasdaq-100® Index (the "Performance Index"). Over the period, U.S. equities advanced, with technology-heavy and growth-oriented benchmarks leading the market. Smaller-cap equities also rose, while mid-cap growth lagged value-oriented benchmarks. The following is a summary of the top contributors and detractors that impacted the Fund's performance during the year. TOP PERFORMANCE CONTRIBUTORS Allocations in the following sectors | information technology; communication services; consumer discretionary Position weightings | Micron Technology, Inc.; NVIDIA Corp.; Advanced Micro Devices, Inc. TOP PERFORMANCE DETRACTORS Allocations in the following sectors | Industrials; financials; real estate Position weightings | Netflix, Inc.; Intuit, Inc.; Adobe, Inc.
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| Performance Past Does Not Indicate Future [Text] | The Fund ’s past performance is not a good predictor of how the Fund will perform in the future. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] | Fund Performance The following graph compares a $10,000 initial investment in the Fund to the index(es) listed below for the last 10 fiscal years of the Fund. GROWTH OF $10,000 |
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| Average Annual Return [Table Text Block] |
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| 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. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Jan. 01, 2026 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 1,295,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 105 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 3,300,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 11.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics The following table outlines key fund statistics.
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| Holdings [Text Block] | Graphical Representation of Holdings The information below represents the composition of the Fund's net assets as of the end of the period. Top Industries*
Portfolio Composition * Percentages exclude derivatives (other than purchased options), if any.
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| Material Fund Change [Text Block] | Material Fund Changes This is a summary of certain changes to the Fund since the beginning of the period. Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. Additionally, on March 26, 2026, Corebridge Financial, Inc. and Equitable Holdings, Inc. (“EQH”) announced that they have entered into a definitive agreement to merge (the “Transaction”). The Transaction is expected to close by the end of 2026, subject to customary closing conditions, including the receipt of requisite regulatory approvals and approval of the shareholders of both Corebridge Financial, Inc. and EQH. Under the 1940 Act, an investment advisory agreement between a registered investment company, such as VC I, and its investment adviser must include a provision providing for its automatic termination upon its “assignment” (as defined in the 1940 Act). The closing of the Transaction may be deemed to cause an “assignment” of the Investment Advisory Agreement between VC I, on behalf of each Fund, and VALIC. As a result, the closing of the Transaction may cause the Investment Advisory Agreement to terminate automatically in accordance with its terms. It is anticipated that, prior to the closing of the Transaction, VC I’s Board of Directors (the “Board”) will consider a new investment advisory agreement between VC I, on behalf of each Fund, and VALIC. If approved by the Board, the new investment advisory agreement will be presented to the Funds’ shareholders for approval, and, if approved by shareholders, it will take effect upon the closing of the Transaction. For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542.
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| Material Fund Change Adviser [Text Block] | Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Accountant Change Disagreements [Text Block] | Changes in and Disagreements with Accountants There were no changes in or disagreements with the accountants during the period.
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| C000021773 [Member] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | Science & Technology | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Science & Technology | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | VCSTX | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the VALIC Company I Science & Technology Fund (the “Fund”) for the period of June 1, 2025 to May 31, 2026. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by contacting us at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period.
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| Additional Information Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] | Fund Expenses What were the Fund costs for the last year ? (Based on a hypothetical $10,000 investment)
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| Expenses Paid, Amount | $ 117 | [9] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.90% | [9] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS The Fund posted a return of 60.51% for the year ended May 31, 2026, compared to 29.78% for the S&P 500® Index (a broad-based securities market index) and 66.24% for the S&P North American Technology Sector Index (the "Performance Index"). Over the annual period, global equity markets provided strong results across broad indices, particularly technology stocks which rallied thanks to favorable underlying fundamentals and earnings growth, particularly from AI-related stocks. The following is a summary, by subadviser, of the top contributors and detractors that impacted their portion of the Fund's performance during the year relative to the Performance Index. TOP PERFORMANCE CONTRIBUTORS BlackRock Investment Management, LLC | In aggregate: position weightings. Allocations in the following industries: entertainment; automobiles; financial services. Security selection in the following industries: semiconductors & semiconductor equipment; entertainment; technology hardware, storage & peripherals. Position weightings: Spotify Technology SA; QUALCOMM, Inc.; SAP SE Voya Investment Management Co. LLC | In aggregate: position weightings; sector allocations. Allocations in the following industries: software; electrical equipment; semiconductors & semiconductor equipment. Security selection in the following industries: technology hardware storage & peripherals; semiconductors & semiconductor equipment; IT services. Position weightings: Micron Technology, Inc.; Sandisk Corp.; Lam Research Corp. TOP PERFORMANCE DETRACTORS BlackRock Investment Management, LLC | In aggregate: sector allocations. Allocations in the following industries: IT services; semiconductor & semiconductor equipment; electrical equipment. Security selection in the following industries: software; IT services; communications equipment. Position weightings: lack of a position in Palantir Technologies, Inc., Class A; ASML Holding NV; Meta Platforms, Inc., Class A Voya Investment Management Co. LLC | Allocations in the following industries: interactive media & services; cash; communications equipment. Security selection in the following industries: software; entertainment. Position weightings: lack of position in Intel Corp.; KraneShares CSI China Internet ETF; Zscaler, Inc.
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| Performance Past Does Not Indicate Future [Text] | The Fund ’s past performance is not a good predictor of how the Fund will perform in the future. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] | Fund Performance The following graph compares a $10,000 initial investment in the Fund to the index(es) listed below for the last 10 fiscal years of the Fund. GROWTH OF $10,000 |
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| Average Annual Return [Table Text Block] |
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| 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. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Jan. 01, 2026 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 3,865,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 94 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 25,400,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 45.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics The following table outlines key fund statistics.
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| Holdings [Text Block] | Graphical Representation of Holdings The information below represents the composition of the Fund's net assets as of the end of the period. Top Industries*
Portfolio Composition * Percentages exclude derivatives (other than purchased options), if any.
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| Material Fund Change [Text Block] | Material Fund Changes This is a summary of certain changes to the Fund since the beginning of the period. Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. Additionally, on March 26, 2026, Corebridge Financial, Inc. and Equitable Holdings, Inc. (“EQH”) announced that they have entered into a definitive agreement to merge (the “Transaction”). The Transaction is expected to close by the end of 2026, subject to customary closing conditions, including the receipt of requisite regulatory approvals and approval of the shareholders of both Corebridge Financial, Inc. and EQH. Under the 1940 Act, an investment advisory agreement between a registered investment company, such as VC I, and its investment adviser must include a provision providing for its automatic termination upon its “assignment” (as defined in the 1940 Act). The closing of the Transaction may be deemed to cause an “assignment” of the Investment Advisory Agreement between VC I, on behalf of each Fund, and VALIC. As a result, the closing of the Transaction may cause the Investment Advisory Agreement to terminate automatically in accordance with its terms. It is anticipated that, prior to the closing of the Transaction, VC I’s Board of Directors (the “Board”) will consider a new investment advisory agreement between VC I, on behalf of each Fund, and VALIC. If approved by the Board, the new investment advisory agreement will be presented to the Funds’ shareholders for approval, and, if approved by shareholders, it will take effect upon the closing of the Transaction. For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542.
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| Material Fund Change Adviser [Text Block] | Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Accountant Change Disagreements [Text Block] | Changes in and Disagreements with Accountants There were no changes in or disagreements with the accountants during the period.
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| C000021774 [Member] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | Systematic Growth | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Systematic Growth | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | VCBCX | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the VALIC Company I Systematic Growth Fund (the “Fund”) for the period of June 1, 2025 to May 31, 2026. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by contacting us at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period.
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| Additional Information Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] | Fund Expenses What were the Fund costs for the last year ? (Based on a hypothetical $10,000 investment)
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| Expenses Paid, Amount | $ 72 | [10] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.64% | [10] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS The Fund posted a return of 26.47% for the year ended May 31, 2026, compared to a return of 29.78% for the S&P 500® Index (a broad-based securities market index) and 28.66% for the Russell 1000® Growth Index (the "Performance Index").U.S. growth stocks, as measured by the Russell 1000 Growth Index, rose during the 1-year period. Against this backdrop, factor behavior was mixed, as investors reacted to ever evolving uncertainties. During the period, stocks with positive fundamental trends and attractive pricing outperformed, while higher quality stocks generally underperformed. The following is a summary, by subadviser, of the top contributors and detractors that impacted their portion of the Fund's performance during the year relative to the Performance Index. TOP PERFORMANCE CONTRIBUTORS Goldman Sachs Asset Management, LLC | Allocations in the following sectors: communication services; real estate; utilities. Security selection in the following sectors: communication services; health care; materials. Position weightings: Alphabet, Inc., Class A; Netflix, Inc.; Comfort Systems USA, Inc. Wellington Management Company, LLP | Allocations in the following sectors: consumer staples; consumer discretionary; real estate. Security selection in the following sectors: industrials; communication services; materials. Position weightings: Comfort Systems USA, Inc.; Dell Technologies, Inc., Class C; ServiceNow, Inc. TOP PERFORMANCE DETRACTORS Goldman Sachs Asset Management, LLC | In aggregate: sector allocations. Allocations in the following sectors: cash; information technology; financials. Security selection in the following sectors: information technology; consumer discretionary; industrials. Position weightings: Advanced Micro Devices, Inc.; Broadcom, Inc.; Microsoft Corp. Wellington Management Company, LLP | Allocations in the following sectors: financials; cash; health care. Security selection in the following sectors: financials; information technology; health care. Position weightings: Advanced Micro Devices, Inc.; Fiserv, Inc.; Brown & Brown, Inc.
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| Performance Past Does Not Indicate Future [Text] | The Fund ’s past performance is not a good predictor of how the Fund will perform in the future. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] | Fund Performance The following graph compares a $10,000 initial investment in the Fund to the index(es) listed below for the last 10 fiscal years of the Fund. GROWTH OF $10,000 |
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| Average Annual Return [Table Text Block] |
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| 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. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Jan. 01, 2026 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 1,066,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 183 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 5,600,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 41.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics The following table outlines key fund statistics.
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| Holdings [Text Block] | Graphical Representation of Holdings The information below represents the composition of the Fund's net assets as of the end of the period. Top Industries*
Portfolio Composition * Percentages exclude derivatives (other than purchased options), if any.
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| Material Fund Change [Text Block] | Material Fund Changes This is a summary of certain changes to the Fund since the beginning of the period. Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. Additionally, on March 26, 2026, Corebridge Financial, Inc. and Equitable Holdings, Inc. (“EQH”) announced that they have entered into a definitive agreement to merge (the “Transaction”). The Transaction is expected to close by the end of 2026, subject to customary closing conditions, including the receipt of requisite regulatory approvals and approval of the shareholders of both Corebridge Financial, Inc. and EQH. Under the 1940 Act, an investment advisory agreement between a registered investment company, such as VC I, and its investment adviser must include a provision providing for its automatic termination upon its “assignment” (as defined in the 1940 Act). The closing of the Transaction may be deemed to cause an “assignment” of the Investment Advisory Agreement between VC I, on behalf of each Fund, and VALIC. As a result, the closing of the Transaction may cause the Investment Advisory Agreement to terminate automatically in accordance with its terms. It is anticipated that, prior to the closing of the Transaction, VC I’s Board of Directors (the “Board”) will consider a new investment advisory agreement between VC I, on behalf of each Fund, and VALIC. If approved by the Board, the new investment advisory agreement will be presented to the Funds’ shareholders for approval, and, if approved by shareholders, it will take effect upon the closing of the Transaction. For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542.
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| Material Fund Change Adviser [Text Block] | Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Accountant Change Disagreements [Text Block] | Changes in and Disagreements with Accountants There were no changes in or disagreements with the accountants during the period.
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| C000021776 [Member] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | Small Cap Index | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Small Cap Index | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | VCSLX | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the VALIC Company I Small Cap Index Fund (the “Fund”) for the period of June 1, 2025 to May 31, 2026. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by contacting us at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] |
This report describes changes to the Fund that occurred during the reporting period.
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| Additional Information Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] |
Fund Expenses
What were the Fund costs for the last year ?
(Based on a hypothetical $10,000 investment)
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| Expenses Paid, Amount | $ 44 | [11] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.36% | [11] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] |
Management’s Discussion of Fund Performance
SUMMARY OF RESULTS
The Fund is managed to seek to track the performance of the Index. The Subadviser may endeavor to track the Index by purchasing every stock included in the Index, in the same proportions; or, in the alternative, the Subadviser may invest in a sampling of Index stocks by utilizing a statistical technique known as "optimization".
The Fund posted a return of 42.62% for the year ended May 31, 2026, compared to a return of 29.45% for the Russell 3000® Index (a broad-based securities market index) and 43.08% for the Russell 2000® Index (the "Performance Index"). Over the period, U.S. equities advanced, with technology-heavy and growth-oriented benchmarks leading the market. Smaller-cap equities also rose, while mid-cap growth lagged value-oriented benchmarks.
The following is a summary of the top contributors and detractors that impacted the Fund's performance during the year.
TOP PERFORMANCE CONTRIBUTORS
Allocations in the following sectors | information technology; industrials; health care
Position weightings | Bloom Energy Corp., Class A; Credo Technology Group Holding, Ltd.; Sterling Infrastructure, Inc.
TOP PERFORMANCE DETRACTORS
Allocations in the following sectors | consumer staples
Position weightings | Hims & Hers Health, Inc.; Badger Meter, Inc.; SPS Commerce, Inc.
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| Performance Past Does Not Indicate Future [Text] | The Fund ’s past performance is not a good predictor of how the Fund will perform in the future. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] |
Fund Performance
The following graph compares a $10,000 initial investment in the Fund to the index(es) listed below for the last 10 fiscal years of the Fund.
GROWTH OF $10,000
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| Average Annual Return [Table Text Block] |
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| 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. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Jan. 01, 2026 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 1,368,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 1,933 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 2,700,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 26.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] |
Key Fund Statistics
The following table outlines key fund statistics.
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| Holdings [Text Block] |
Graphical Representation of Holdings
The information below represents the composition of the Fund's net assets as of the end of the period.
Top Industries*
Portfolio Composition
* Percentages exclude derivatives (other than purchased options), if any.
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| Material Fund Change [Text Block] |
Material Fund Changes
This is a summary of certain changes to the Fund since the beginning of the period. Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. Additionally, on March 26, 2026, Corebridge Financial, Inc. and Equitable Holdings, Inc. (“EQH”) announced that they have entered into a definitive agreement to merge (the “Transaction”). The Transaction is expected to close by the end of 2026, subject to customary closing conditions, including the receipt of requisite regulatory approvals and approval of the shareholders of both Corebridge Financial, Inc. and EQH. Under the 1940 Act, an investment advisory agreement between a registered investment company, such as VC I, and its investment adviser must include a provision providing for its automatic termination upon its “assignment” (as defined in the 1940 Act). The closing of the Transaction may be deemed to cause an “assignment” of the Investment Advisory Agreement between VC I, on behalf of each Fund, and VALIC. As a result, the closing of the Transaction may cause the Investment Advisory Agreement to terminate automatically in accordance with its terms. It is anticipated that, prior to the closing of the Transaction, VC I’s Board of Directors (the “Board”) will consider a new investment advisory agreement between VC I, on behalf of each Fund, and VALIC. If approved by the Board, the new investment advisory agreement will be presented to the Funds’ shareholders for approval, and, if approved by shareholders, it will take effect upon the closing of the Transaction. For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542.
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| Material Fund Change Adviser [Text Block] | Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Accountant Change Disagreements [Text Block] |
Changes in and Disagreements with Accountants
There were no changes in or disagreements with the accountants during the period.
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| C000021777 [Member] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | International Socially Responsible | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | International Socially Responsible | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | VCSOX | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the VALIC Company I International Socially Responsible Fund (the “Fund”) for the period of June 1, 2025 to May 31, 2026. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by contacting us at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period.
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| Additional Information Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] | Fund Expenses What were the Fund costs for the last year ? (Based on a hypothetical $10,000 investment)
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| Expenses Paid, Amount | $ 63 | [12] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.57% | [12] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS The Fund is an optimized portfolio which seeks to track the MSCI EAFE Index (net), while investing in socially responsive companies. The Fund's criteria do not permit investment in companies whose businesses rely significantly on alcohol, firearms, gambling, tobacco, nuclear power, production of weaponry, have poor labor/employee relations or environmental records. These criteria may create differences in Fund performance relative to that of the Benchmark. The Fund posted a return of 21.53% for the year ended May 31, 2026, compared to a return of 22.80% for the MSCI EAFE Index (net) (a broad-based securities market & "Performance Index"). Over the period, developed international equities advanced but trailed the strongest U.S. growth-oriented and technology-heavy benchmarks. International equities outpaced weaker U.S. mid-cap growth benchmarks. The following is a summary of the top contributors and detractors that impacted the Fund's performance during the year relative to the Performance Index. TOP PERFORMANCE CONTRIBUTORS In aggregate | sector allocations Allocations in the following sectors | consumer staples; information technology; financials Security selection in the following sectors | industrials; information technology; energy Position weightings | lack of position in Novo Nordisk A/S, Class B; lack of position in Nestle SA; lack of position in Antofagasta PLC Exposure to the following countries | Netherlands; Denmark; France TOP PERFORMANCE DETRACTORS In aggregate | position weightings Allocations in the following sectors | real estate; energy; industrials Security selection in the following sectors | financials; materials; consumer discretionary Position weightings | lack of position in HSBC Holdings PLC; lack of position in BHP Group, Ltd.; lack of position in Siemens Energy AG Exposure to the following countries | Spain; Singapore; Switzerland
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| Performance Past Does Not Indicate Future [Text] | The Fund ’s past performance is not a good predictor of how the Fund will perform in the future. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] | Fund Performance The following graph compares a $10,000 initial investment in the Fund to the index(es) listed below for the last 10 fiscal years of the Fund. GROWTH OF $10,000 |
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| Average Annual Return [Table Text Block] |
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| 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. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Jan. 01, 2026 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 511,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 464 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 2,300,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 9.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics The following table outlines key fund statistics.
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| Holdings [Text Block] | Graphical Representation of Holdings The information below represents the composition of the Fund's net assets as of the end of the period. Top Industries*
Portfolio Composition Country * Percentages exclude derivatives (other than purchased options), if any.
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| Material Fund Change [Text Block] | Material Fund Changes This is a summary of certain changes to the Fund since the beginning of the period. Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. Additionally, on March 26, 2026, Corebridge Financial, Inc. and Equitable Holdings, Inc. (“EQH”) announced that they have entered into a definitive agreement to merge (the “Transaction”). The Transaction is expected to close by the end of 2026, subject to customary closing conditions, including the receipt of requisite regulatory approvals and approval of the shareholders of both Corebridge Financial, Inc. and EQH. Under the 1940 Act, an investment advisory agreement between a registered investment company, such as VC I, and its investment adviser must include a provision providing for its automatic termination upon its “assignment” (as defined in the 1940 Act). The closing of the Transaction may be deemed to cause an “assignment” of the Investment Advisory Agreement between VC I, on behalf of each Fund, and VALIC. As a result, the closing of the Transaction may cause the Investment Advisory Agreement to terminate automatically in accordance with its terms. It is anticipated that, prior to the closing of the Transaction, VC I’s Board of Directors (the “Board”) will consider a new investment advisory agreement between VC I, on behalf of each Fund, and VALIC. If approved by the Board, the new investment advisory agreement will be presented to the Funds’ shareholders for approval, and, if approved by shareholders, it will take effect upon the closing of the Transaction. For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542.
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| Material Fund Change Adviser [Text Block] | Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Accountant Change Disagreements [Text Block] | Changes in and Disagreements with Accountants There were no changes in or disagreements with the accountants during the period.
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| C000021778 [Member] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | Stock Index | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Stock Index | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | VSTIX | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the VALIC Company I Stock Index Fund (the “Fund”) for the period of June 1, 2025 to May 31, 2026. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by contacting us at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period.
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| Additional Information Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] | Fund Expenses What were the Fund costs for the last year ? (Based on a hypothetical $10,000 investment)
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| Expenses Paid, Amount | $ 25 | [13] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.22% | [13] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS The Fund is managed to seek to track the performance of the Index. The Subadviser may endeavor to track the Index by purchasing every stock included in the Index, in the same proportions; or, in the alternative, the Subadviser may invest in a sampling of Index stocks by utilizing a statistical technique known as "optimization". The Fund posted a return of 29.47% for the year ended May 31, 2026, compared to a return of 29.78% for the S&P 500® Index (a broad-based securities market & "Performance Index"). Over the period, U.S. equities advanced, with technology-heavy and growth-oriented benchmarks leading the market. Smaller-cap equities also rose, while mid-cap growth lagged value-oriented benchmarks. The following is a summary of the top contributors and detractors that impacted the Fund's performance during the year. TOP PERFORMANCE CONTRIBUTORS Allocations in the following sectors | information technology; communication services; industrials Position weightings | NVIDIA Corp.; Apple, Inc.; Alphabet, Inc., Class A TOP PERFORMANCE DETRACTORS Allocations in the following sectors | none Position weightings | Netflix, Inc.; Intuit, Inc.; Boston Scientific Corp.
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| Performance Past Does Not Indicate Future [Text] | The Fund ’s past performance is not a good predictor of how the Fund will perform in the future. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] | Fund Performance The following graph compares a $10,000 initial investment in the Fund to the index(es) listed below for the last 10 fiscal years of the Fund. GROWTH OF $10,000 |
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| Average Annual Return [Table Text Block] |
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| 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. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Jan. 01, 2026 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 7,158,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 508 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 8,800,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 4.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics The following table outlines key fund statistics.
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| Holdings [Text Block] | Graphical Representation of Holdings The information below represents the composition of the Fund's net assets as of the end of the period. Top Industries*
Portfolio Composition * Percentages exclude derivatives (other than purchased options), if any.
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| Material Fund Change [Text Block] | Material Fund Changes This is a summary of certain changes to the Fund since the beginning of the period. Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. Additionally, on March 26, 2026, Corebridge Financial, Inc. and Equitable Holdings, Inc. (“EQH”) announced that they have entered into a definitive agreement to merge (the “Transaction”). The Transaction is expected to close by the end of 2026, subject to customary closing conditions, including the receipt of requisite regulatory approvals and approval of the shareholders of both Corebridge Financial, Inc. and EQH. Under the 1940 Act, an investment advisory agreement between a registered investment company, such as VC I, and its investment adviser must include a provision providing for its automatic termination upon its “assignment” (as defined in the 1940 Act). The closing of the Transaction may be deemed to cause an “assignment” of the Investment Advisory Agreement between VC I, on behalf of each Fund, and VALIC. As a result, the closing of the Transaction may cause the Investment Advisory Agreement to terminate automatically in accordance with its terms. It is anticipated that, prior to the closing of the Transaction, VC I’s Board of Directors (the “Board”) will consider a new investment advisory agreement between VC I, on behalf of each Fund, and VALIC. If approved by the Board, the new investment advisory agreement will be presented to the Funds’ shareholders for approval, and, if approved by shareholders, it will take effect upon the closing of the Transaction. For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542.
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| Material Fund Change Adviser [Text Block] | Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Accountant Change Disagreements [Text Block] | Changes in and Disagreements with Accountants There were no changes in or disagreements with the accountants during the period.
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| C000021782 [Member] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | Government Securities | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Government Securities | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | VCGSX | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the VALIC Company I Government Securities Fund (the “Fund”) for the period of June 1, 2025 to May 31, 2026. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by contacting us at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] |
This report describes changes to the Fund that occurred during the reporting period.
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| Additional Information Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] |
Fund Expenses
What were the Fund costs for the last year ?
(Based on a hypothetical $10,000 investment)
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| Expenses Paid, Amount | $ 58 | [14] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.57% | [14] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] |
Management’s Discussion of Fund Performance
SUMMARY OF RESULTS
The Fund posted a return of 4.23% for the year ended May 31, 2026, compared to a return of 5.13% for the Bloomberg U.S. Aggregate Bond Index (a broad-based securities market index) and 3.71% for the Bloomberg U.S. Government Bond Index (the "Performance Index"). During the period, the U.S. Treasury curve flattened as intermediate yields rose more than the long end. The two-year yield increased 11 bps to 4.00%, the five-year yield rose 18 bps to 4.14%, the ten-year yield edged up 3 bps to 4.44%, and the thirty-year yield increased 4 bps to 4.97%. In contrast, the front end rallied - the three-month yield fell 66 bps to 3.67% and the one-year yield declined 33 bps to 3.77%. Mortgage-backed securities outperformed U.S. Treasury and agency securities.
The following is a summary of the top contributors and detractors that impacted the Fund's performance during the year relative to the Performance Index.
TOP PERFORMANCE CONTRIBUTORS
In aggregate | sector allocations
Allocations in the following sectors | agency mortgage-backed securities; commercial mortgage-backed securities; corporate credit
Security selection in the following sectors | U.S. Treasuries; U.S agency debt securities
TOP PERFORMANCE DETRACTORS
Allocations in the following sectors | U.S. agency debt securities
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| Performance Past Does Not Indicate Future [Text] | The Fund ’s past performance is not a good predictor of how the Fund will perform in the future. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] |
Fund Performance
The following graph compares a $10,000 initial investment in the Fund to the index(es) listed below for the last 10 fiscal years of the Fund.
GROWTH OF $10,000
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| Average Annual Return [Table Text Block] |
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| 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. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Jan. 01, 2026 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 199,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 265 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 700,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 59.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] |
Key Fund Statistics
The following table outlines key fund statistics.
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| Holdings [Text Block] |
Graphical Representation of Holdings
The information below represents the composition of the Fund as of the end of the period.
Portfolio Composition
(% of net assets) Credit Quality **
(% of total debt issues) ** Credit quality ratings shown above reflect the rating assigned by Moody's Investors Service, Inc. Where Moody's ratings are not available, we have used Standard & Poor's ratings. Unrated investments do not necessarily indicate low credit quality. Credit quality ratings are subject to change. Percentages exclude short-term securities.
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| Credit Quality Explanation [Text Block] | Credit quality ratings shown above reflect the rating assigned by Moody's Investors Service, Inc. Where Moody's ratings are not available, we have used Standard & Poor's ratings. Unrated investments do not necessarily indicate low credit quality. Credit quality ratings are subject to change. Percentages exclude short-term securities. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Credit Ratings Selection [Text Block] | Credit quality ratings shown above reflect the rating assigned by Moody's Investors Service, Inc. Where Moody's ratings are not available, we have used Standard & Poor's ratings. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change [Text Block] |
Material Fund Changes
This is a summary of certain changes to the Fund since the beginning of the period. Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. Additionally, on March 26, 2026, Corebridge Financial, Inc. and Equitable Holdings, Inc. (“EQH”) announced that they have entered into a definitive agreement to merge (the “Transaction”). The Transaction is expected to close by the end of 2026, subject to customary closing conditions, including the receipt of requisite regulatory approvals and approval of the shareholders of both Corebridge Financial, Inc. and EQH. Under the 1940 Act, an investment advisory agreement between a registered investment company, such as VC I, and its investment adviser must include a provision providing for its automatic termination upon its “assignment” (as defined in the 1940 Act). The closing of the Transaction may be deemed to cause an “assignment” of the Investment Advisory Agreement between VC I, on behalf of each Fund, and VALIC. As a result, the closing of the Transaction may cause the Investment Advisory Agreement to terminate automatically in accordance with its terms. It is anticipated that, prior to the closing of the Transaction, VC I’s Board of Directors (the “Board”) will consider a new investment advisory agreement between VC I, on behalf of each Fund, and VALIC. If approved by the Board, the new investment advisory agreement will be presented to the Funds’ shareholders for approval, and, if approved by shareholders, it will take effect upon the closing of the Transaction.
Effective September 29, 2025, the Fund’s contractual advisory fee waiver was amended to lower the advisory fee rate payable by the Fund to VALIC to 0.385% of the Fund’s average daily net assets on the first $250 million, 0.335% of the Fund’s average daily net assets on the next $250 million, 0.285% of the Fund’s average daily net assets on the next $500 million, and 0.235% of the Fund’s average daily net assets over $1 billion. Effective January 29, 2026, the Fund made certain changes to its investment strategies with respect to derivatives. As a result, Derivatives Risk was added as a principal risk. For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542.
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| Material Fund Change Expenses [Text Block] | Effective September 29, 2025, the Fund’s contractual advisory fee waiver was amended to lower the advisory fee rate payable by the Fund to VALIC to 0.385% of the Fund’s average daily net assets on the first $250 million, 0.335% of the Fund’s average daily net assets on the next $250 million, 0.285% of the Fund’s average daily net assets on the next $500 million, and 0.235% of the Fund’s average daily net assets over $1 billion. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Strategies [Text Block] | Effective January 29, 2026, the Fund made certain changes to its investment strategies with respect to derivatives. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Risks Change [Text Block] | As a result, Derivatives Risk was added as a principal risk. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Adviser [Text Block] | Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Accountant Change Disagreements [Text Block] |
Changes in and Disagreements with Accountants
There were no changes in or disagreements with the accountants during the period.
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| C000021783 [Member] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | Systematic Core | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Systematic Core | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | VCGAX | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the VALIC Company I Systematic Core Fund (the “Fund”) for the period of June 1, 2025 to May 31, 2026. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by contacting us at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period.
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| Additional Information Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] | Fund Expenses What were the Fund costs for the last year ? (Based on a hypothetical $10,000 investment)
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| Expenses Paid, Amount | $ 70 | [15] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.63% | [15] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS The Fund posted a return of 22.73% for the year ended May 31, 2026, compared to a return of 28.85% for the Russell 1000® Index (a broad-based securities market & "Performance Index"). Over the period, U.S. large-cap equities underperformed small-cap equities significantly, according to the Russell® family of indices. In terms of style factors, value remained flat with respect to growth. The following is a summary of the top contributors and detractors that impacted the Fund's performance during the year relative to the Performance Index. TOP PERFORMANCE CONTRIBUTORS Allocations in the following sectors | real estate; utilities; communication services Security selection in the following sectors | health care; financials; communication services Position weightings | Ciena Corp.; Millicom International Cellular SA; Jazz Pharmaceuticals PLC TOP PERFORMANCE DETRACTORS In aggregate | position weightings; sector allocations Allocations in the following sectors | financials; information technology; consumer staples Security selection in the following sectors | information technology; industrials; consumer staples Position weightings | Micron Technology, Inc; Advanced Micro Devices, Inc; Intel Corp.
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| Performance Past Does Not Indicate Future [Text] | The Fund ’s past performance is not a good predictor of how the Fund will perform in the future. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] | Fund Performance The following graph compares a $10,000 initial investment in the Fund to the index(es) listed below for the last 10 fiscal years of the Fund. GROWTH OF $10,000 |
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| Average Annual Return [Table Text Block] |
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| 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. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Jan. 01, 2026 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 680,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 347 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 3,700,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 58.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics The following table outlines key fund statistics.
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| Holdings [Text Block] | Graphical Representation of Holdings The information below represents the composition of the Fund's net assets as of the end of the period. Top Industries*
Portfolio Composition * Percentages exclude derivatives (other than purchased options), if any.
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| Material Fund Change [Text Block] | Material Fund Changes This is a summary of certain changes to the Fund since the beginning of the period. Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. Additionally, on March 26, 2026, Corebridge Financial, Inc. and Equitable Holdings, Inc. (“EQH”) announced that they have entered into a definitive agreement to merge (the “Transaction”). The Transaction is expected to close by the end of 2026, subject to customary closing conditions, including the receipt of requisite regulatory approvals and approval of the shareholders of both Corebridge Financial, Inc. and EQH. Under the 1940 Act, an investment advisory agreement between a registered investment company, such as VC I, and its investment adviser must include a provision providing for its automatic termination upon its “assignment” (as defined in the 1940 Act). The closing of the Transaction may be deemed to cause an “assignment” of the Investment Advisory Agreement between VC I, on behalf of each Fund, and VALIC. As a result, the closing of the Transaction may cause the Investment Advisory Agreement to terminate automatically in accordance with its terms. It is anticipated that, prior to the closing of the Transaction, VC I’s Board of Directors (the “Board”) will consider a new investment advisory agreement between VC I, on behalf of each Fund, and VALIC. If approved by the Board, the new investment advisory agreement will be presented to the Funds’ shareholders for approval, and, if approved by shareholders, it will take effect upon the closing of the Transaction. For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542.
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| Material Fund Change Adviser [Text Block] | Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Accountant Change Disagreements [Text Block] | Changes in and Disagreements with Accountants There were no changes in or disagreements with the accountants during the period.
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| C000021785 [Member] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | Dividend Value | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Dividend Value | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | VCIGX | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the VALIC Company I Dividend Value Fund (the “Fund”) for the period of June 1, 2025 to May 31, 2026. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by contacting us at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period.
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| Additional Information Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] | Fund Expenses What were the Fund costs for the last year ? (Based on a hypothetical $10,000 investment)
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| Expenses Paid, Amount | $ 75 | [16] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.68% | [16] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS The Fund posted a return of 21.89% for the year ended May 31, 2026, 29.78% for the S&P 500® Index (a broad-based securities market index) and 28.55% for the Russell 1000® Value Index (the "Performance Index"). A resilient U.S. economy, moderate inflation, continued enthusiasm for AI-related stocks and a Fed cutting interest rates helped markets make gains despite concerns over tariffs and war in the Middle East, which raised the specter of energy-driven inflation. The following is a summary, by subadviser, of the top contributors and detractors that impacted their portion of the Fund's performance during the year relative to the Performance Index. TOP PERFORMANCE CONTRIBUTORS BlackRock Investment Management, LLC | In aggregate: sector allocations. Allocations in the following sectors: information technology; financials; consumer staples. Security selection in the following sectors: consumer discretionary; consumer staples; utilities. Position weightings: Samsung Electronics Co., Ltd.; Western Digital Corp.; lack of position in Berkshire Hathaway, Inc., Class B ClearBridge Investments, LLC | In aggregate: sector allocations. Allocations in the following sectors: information technology; financials; consumer discretionary. Security selection in the following sectors: health care; utilities. Position weightings: Broadcom, Inc.; Texas Instruments Inc.; lack of position in Berkshire Hathaway Inc., Class B TOP PERFORMANCE DETRACTORS BlackRock Investment Management, LLC | In aggregate: position weightings. Allocations in the following sectors: cash; health care; energy. Security selection in the following sectors: communication services; information technology; health care. Position weightings: lack of position in Micron Technology, Inc.; Baxter International, Inc.; Fidelity National Information Services, Inc. ClearBridge Investments, LLC | In aggregate: position weightings. Allocations in the following sectors: cash; consumer staples; industrials. Security selection in the following sectors: information technology; communication services; energy. Position weightings: lack of position in Micron Technology, Inc.; lack of position in Intel Corp.; Microsoft Corp.
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| Performance Past Does Not Indicate Future [Text] | The Fund ’s past performance is not a good predictor of how the Fund will perform in the future. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] | Fund Performance The following graph compares a $10,000 initial investment in the Fund to the index(es) listed below for the last 10 fiscal years of the Fund. GROWTH OF $10,000 |
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| Average Annual Return [Table Text Block] |
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| 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. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Jan. 01, 2026 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 915,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 120 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 3,800,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 95.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics The following table outlines key fund statistics.
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| Holdings [Text Block] | Graphical Representation of Holdings The information below represents the composition of the Fund's net assets as of the end of the period. Top Industries*
Portfolio Composition * Percentages exclude derivatives (other than purchased options), if any.
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| Material Fund Change [Text Block] | Material Fund Changes This is a summary of certain changes to the Fund since the beginning of the period. Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. Additionally, on March 26, 2026, Corebridge Financial, Inc. and Equitable Holdings, Inc. (“EQH”) announced that they have entered into a definitive agreement to merge (the “Transaction”). The Transaction is expected to close by the end of 2026, subject to customary closing conditions, including the receipt of requisite regulatory approvals and approval of the shareholders of both Corebridge Financial, Inc. and EQH. Under the 1940 Act, an investment advisory agreement between a registered investment company, such as VC I, and its investment adviser must include a provision providing for its automatic termination upon its “assignment” (as defined in the 1940 Act). The closing of the Transaction may be deemed to cause an “assignment” of the Investment Advisory Agreement between VC I, on behalf of each Fund, and VALIC. As a result, the closing of the Transaction may cause the Investment Advisory Agreement to terminate automatically in accordance with its terms. It is anticipated that, prior to the closing of the Transaction, VC I’s Board of Directors (the “Board”) will consider a new investment advisory agreement between VC I, on behalf of each Fund, and VALIC. If approved by the Board, the new investment advisory agreement will be presented to the Funds’ shareholders for approval, and, if approved by shareholders, it will take effect upon the closing of the Transaction. For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542.
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| Material Fund Change Adviser [Text Block] | Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Accountant Change Disagreements [Text Block] | Changes in and Disagreements with Accountants There were no changes in or disagreements with the accountants during the period.
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| C000021786 [Member] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | Inflation Protected | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Inflation Protected | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | VCTPX | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the VALIC Company I Inflation Protected Fund (the “Fund”) for the period of June 1, 2025 to May 31, 2026. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by contacting us at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period.
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| Additional Information Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] | Fund Expenses What were the Fund costs for the last year ? (Based on a hypothetical $10,000 investment)
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| Expenses Paid, Amount | $ 57 | [17] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.55% | [17] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS The Fund posted a return of 5.80% for the year ended May 31, 2026, compared to a return of 5.13% for the Bloomberg U.S. Aggregate Bond Index (a broad-based securities market index) and 4.90% for the Bloomberg U.S. Treasury Inflation-Protected Securities (“TIPS”) Index (the "Performance Index"). Global inflation linked bonds outperformed U.S. TIPS during the period according to the Bloomberg Global Inflation Linked Bond index and Bloomberg U.S. TIPS index. The following is a summary of the top contributors and detractors that impacted the Fund's performance during the year relative to the Performance Index. TOP PERFORMANCE CONTRIBUTORS Allocations in the following sectors | developed non-U.S. dollar; emerging market debt; mortgage-backed securities TOP PERFORMANCE DETRACTORS Allocations in the following sectors | U.S. Government Security selection in the following sectors | U.S. Government TIPS
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| Performance Past Does Not Indicate Future [Text] | The Fund ’s past performance is not a good predictor of how the Fund will perform in the future. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] | Fund Performance The following graph compares a $10,000 initial investment in the Fund to the index(es) listed below for the last 10 fiscal years of the Fund. GROWTH OF $10,000 |
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| Average Annual Return [Table Text Block] |
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| 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. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Jan. 01, 2026 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 356,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 130 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 1,600,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 45.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics The following table outlines key fund statistics.
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| Holdings [Text Block] | Graphical Representation of Holdings The information below represents the composition of the Fund as of the end of the period. Portfolio Composition (% of net assets) Credit Quality ** (% of total debt issues) ** Credit quality ratings shown above reflect the rating assigned by Moody's Investors Service, Inc. Where Moody's ratings are not available, we have used Standard & Poor's ratings. Unrated investments do not necessarily indicate low credit quality. Credit quality ratings are subject to change. Percentages exclude short-term securities.
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| Credit Quality Explanation [Text Block] | Credit quality ratings shown above reflect the rating assigned by Moody's Investors Service, Inc. Where Moody's ratings are not available, we have used Standard & Poor's ratings. Unrated investments do not necessarily indicate low credit quality. Credit quality ratings are subject to change. Percentages exclude short-term securities. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Credit Ratings Selection [Text Block] | Credit quality ratings shown above reflect the rating assigned by Moody's Investors Service, Inc. Where Moody's ratings are not available, we have used Standard & Poor's ratings. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change [Text Block] | Material Fund Changes This is a summary of certain changes to the Fund since the beginning of the period. Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. Additionally, on March 26, 2026, Corebridge Financial, Inc. and Equitable Holdings, Inc. (“EQH”) announced that they have entered into a definitive agreement to merge (the “Transaction”). The Transaction is expected to close by the end of 2026, subject to customary closing conditions, including the receipt of requisite regulatory approvals and approval of the shareholders of both Corebridge Financial, Inc. and EQH. Under the 1940 Act, an investment advisory agreement between a registered investment company, such as VC I, and its investment adviser must include a provision providing for its automatic termination upon its “assignment” (as defined in the 1940 Act). The closing of the Transaction may be deemed to cause an “assignment” of the Investment Advisory Agreement between VC I, on behalf of each Fund, and VALIC. As a result, the closing of the Transaction may cause the Investment Advisory Agreement to terminate automatically in accordance with its terms. It is anticipated that, prior to the closing of the Transaction, VC I’s Board of Directors (the “Board”) will consider a new investment advisory agreement between VC I, on behalf of each Fund, and VALIC. If approved by the Board, the new investment advisory agreement will be presented to the Funds’ shareholders for approval, and, if approved by shareholders, it will take effect upon the closing of the Transaction. Effective September 29, 2025, the Fund’s contractual advisory fee waiver was amended to lower the advisory fee rate payable by the Fund to VALIC to 0.405% of the Fund’s average daily net assets on the first $250 million, 0.355% of the Fund’s average daily net assets on the next $250 million, and 0.305% of the Fund’s average daily net assets over $500 million. For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542.
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| Material Fund Change Expenses [Text Block] | Effective September 29, 2025, the Fund’s contractual advisory fee waiver was amended to lower the advisory fee rate payable by the Fund to VALIC to 0.405% of the Fund’s average daily net assets on the first $250 million, 0.355% of the Fund’s average daily net assets on the next $250 million, and 0.305% of the Fund’s average daily net assets over $500 million. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Adviser [Text Block] | Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Accountant Change Disagreements [Text Block] | Changes in and Disagreements with Accountants There were no changes in or disagreements with the accountants during the period.
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| C000022843 [Member] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | Systematic Value | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Systematic Value | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | VBCVX | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the VALIC Company I Systematic Value Fund (the “Fund”) for the period of June 1, 2025 to May 31, 2026. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by contacting us at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period.
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| Additional Information Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] | Fund Expenses What were the Fund costs for the last year ? (Based on a hypothetical $10,000 investment)
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| Expenses Paid, Amount | $ 72 | [18] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.64% | [18] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS The Fund posted a return of 25.53% for the year ended May 31, 2026, compared to a return of 29.78% for the S&P 500® Index (a broad-based securities market index) and 28.55% for the Russell 1000® Value Index (the "Performance Index"). U.S. value stocks, as measured by the Russell 1000 Value Index, rose during the 1-year period ending May 31, 2026. Against this backdrop, factor behavior was mixed, as investors reacted to ever evolving uncertainties. During the period, deeper value stocks and value stocks with positive fundamental trend generally outperformed, while higher quality value stocks generally underperformed. The following is a summary of the top contributors and detractors that impacted the Fund's performance during the year relative to the Performance Index. TOP PERFORMANCE CONTRIBUTORS Allocations in the following sectors | information technology; utilities; consumer discretionary Security selection in the following sectors | health care; consumer discretionary; energy Position weightings | Micron Technology, Inc.; Dell Technologies, Inc., Class C; APA Corp. TOP PERFORMANCE DETRACTORS In aggregate | position weightings Allocations in the following sectors | financials; energy; cash Security selection in the following sectors | information technology; communication services; consumer staples Position weightings | Intel Corp.; Boston Scientific Corp.; Roper Technologies, Inc.
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| Performance Past Does Not Indicate Future [Text] | The Fund ’s past performance is not a good predictor of how the Fund will perform in the future. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] | Fund Performance The following graph compares a $10,000 initial investment in the Fund to the index(es) listed below for the last 10 fiscal years of the Fund. GROWTH OF $10,000 |
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| Average Annual Return [Table Text Block] |
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| 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. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Jan. 01, 2026 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 653,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 162 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 2,700,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 93.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics The following table outlines key fund statistics.
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| Holdings [Text Block] | Graphical Representation of Holdings The information below represents the composition of the Fund's net assets as of the end of the period. Top Industries*
Portfolio Composition * Percentages exclude derivatives (other than purchased options), if any.
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| Material Fund Change [Text Block] | Material Fund Changes This is a summary of certain changes to the Fund since the beginning of the period. Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. Additionally, on March 26, 2026, Corebridge Financial, Inc. and Equitable Holdings, Inc. (“EQH”) announced that they have entered into a definitive agreement to merge (the “Transaction”). The Transaction is expected to close by the end of 2026, subject to customary closing conditions, including the receipt of requisite regulatory approvals and approval of the shareholders of both Corebridge Financial, Inc. and EQH. Under the 1940 Act, an investment advisory agreement between a registered investment company, such as VC I, and its investment adviser must include a provision providing for its automatic termination upon its “assignment” (as defined in the 1940 Act). The closing of the Transaction may be deemed to cause an “assignment” of the Investment Advisory Agreement between VC I, on behalf of each Fund, and VALIC. As a result, the closing of the Transaction may cause the Investment Advisory Agreement to terminate automatically in accordance with its terms. It is anticipated that, prior to the closing of the Transaction, VC I’s Board of Directors (the “Board”) will consider a new investment advisory agreement between VC I, on behalf of each Fund, and VALIC. If approved by the Board, the new investment advisory agreement will be presented to the Funds’ shareholders for approval, and, if approved by shareholders, it will take effect upon the closing of the Transaction. For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542.
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| Material Fund Change Adviser [Text Block] | Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Accountant Change Disagreements [Text Block] | Changes in and Disagreements with Accountants There were no changes in or disagreements with the accountants during the period.
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| C000022844 [Member] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | International Value | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | International Value | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | VCFVX | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the VALIC Company I International Value Fund (the “Fund”) for the period of June 1, 2025 to May 31, 2026. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by contacting us at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period.
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| Additional Information Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] | Fund Expenses What were the Fund costs for the last year ? (Based on a hypothetical $10,000 investment)
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| Expenses Paid, Amount | $ 89 | [19] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.78% | [19] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS The Fund posted a return of 28.45% for the year ended May 31, 2026, compared to a return of 32.77% for the MSCI ACWI ex USA Index (net) (a broad-based securities market) and 30.07% for the MSCI EAFE Value Index (net) (the "Performance Index"). Over the period, U.S. equities outperformed developed international equities, according to the Russell 1000 Index and MSCI EAFE Index (net). Within developed international, value-oriented stocks outperformed growth stocks, and small-cap stocks outperformed large- and mid-cap stocks, according to the MSCI EAFE family of indices. The following is a summary, by subadviser, of the top contributors and detractors that impacted their portion of the Fund's performance during the year relative to the Performance Index. TOP PERFORMANCE CONTRIBUTORS Columbia Management Investments Advisers, LLC | In aggregate: sector allocations. Allocations in the following sectors: energy; information technology; cash. Security selection in the following sectors: financials; consumer staples; energy. Position weightings: Energy Fuels, Inc.; Pan American Silver Corp.; Piraeus Bank SA. Exposure to the following countries: Canada; United States; Switzerland Goldman Sachs Asset Management, LLC | Allocations in the following sectors: information technology; consumer staples; lack of allocation in real estate. Security selection in the following sectors: information technology; financials; materials. Position weightings: Murata Manufacturing Co., Ltd.; Taiwan Semiconductor Manufacturing Co., Ltd; Rio Tinto PLC. Exposure to the following countries: Japan; Taiwan; Singapore TOP PERFORMANCE DETRACTORS Columbia Management Investments Advisers, LLC | In aggregate: position weightings. Allocations in the following sectors: consumer staples; financials; real estate. Security selection in the following sectors: information technology; consumer discretionary; materials. Position weightings: Check Point Software Technologies, Ltd.; Sankyo Co., Ltd.; Burford Capital, Ltd. Exposure to the following countries: Japan; United Kingdom; Israel Goldman Sachs Asset Management, LLC | Allocations in the following sectors: materials; consumer discretionary; health care. Security selection in the following sectors: industrials; communication services; consumer staples. Position weightings: Capgemini SE; Compass Group PLC; Coca-Cola Europacific Partners PLC. Exposure to the following countries: Switzerland; United States; Australia
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| Performance Past Does Not Indicate Future [Text] | The Fund ’s past performance is not a good predictor of how the Fund will perform in the future. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] | Fund Performance The following graph compares a $10,000 initial investment in the Fund to the index(es) listed below for the last 10 fiscal years of the Fund. GROWTH OF $10,000 |
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| Average Annual Return [Table Text Block] |
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| 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. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Jan. 01, 2026 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 516,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 142 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 2,800,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 66.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics The following table outlines key fund statistics.
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| Holdings [Text Block] | Graphical Representation of Holdings The information below represents the composition of the Fund's net assets as of the end of the period. Top Industries*
Portfolio Composition Country * Percentages exclude derivatives (other than purchased options), if any.
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| Material Fund Change [Text Block] | Material Fund Changes This is a summary of certain changes to the Fund since the beginning of the period. Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. Additionally, on March 26, 2026, Corebridge Financial, Inc. and Equitable Holdings, Inc. (“EQH”) announced that they have entered into a definitive agreement to merge (the “Transaction”). The Transaction is expected to close by the end of 2026, subject to customary closing conditions, including the receipt of requisite regulatory approvals and approval of the shareholders of both Corebridge Financial, Inc. and EQH. Under the 1940 Act, an investment advisory agreement between a registered investment company, such as VC I, and its investment adviser must include a provision providing for its automatic termination upon its “assignment” (as defined in the 1940 Act). The closing of the Transaction may be deemed to cause an “assignment” of the Investment Advisory Agreement between VC I, on behalf of each Fund, and VALIC. As a result, the closing of the Transaction may cause the Investment Advisory Agreement to terminate automatically in accordance with its terms. It is anticipated that, prior to the closing of the Transaction, VC I’s Board of Directors (the “Board”) will consider a new investment advisory agreement between VC I, on behalf of each Fund, and VALIC. If approved by the Board, the new investment advisory agreement will be presented to the Funds’ shareholders for approval, and, if approved by shareholders, it will take effect upon the closing of the Transaction. For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542.
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| Material Fund Change Adviser [Text Block] | Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Accountant Change Disagreements [Text Block] | Changes in and Disagreements with Accountants There were no changes in or disagreements with the accountants during the period.
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| C000022845 [Member] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | Emerging Economies | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Emerging Economies | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | VCGEX | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the VALIC Company I Emerging Economies Fund (the “Fund”) for the period of June 1, 2025 to May 31, 2026. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by contacting us at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period.
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| Additional Information Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] | Fund Expenses What were the Fund costs for the last year ? (Based on a hypothetical $10,000 investment)
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| Expenses Paid, Amount | $ 126 | [20] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.99% | [20] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS The Fund posted a return of 54.26% for the year ended May 31, 2026, compared to a return of 32.77% for the MSCI ACWI ex USA Index (net) (a broad-based securities market index) and 54.31% for the MSCI Emerging Markets Index (net) (the "Performance Index"). The dominant driver of emerging markets strong performance over the period was the AI and semiconductor cycle, which reshaped emerging market leadership around Taiwan and Korea. This gave emerging markets unusually direct exposure to the AI hardware supply chain, including semiconductor, memory, server, and computer-equipment beneficiaries. Performance was also supported by improving investor appetite toward emerging market assets, helped by better earnings momentum, attractive valuations, and expectations for easier policy in several markets. Geopolitics added to volatility. The following is a summary, by subadviser, of the top contributors and detractors that impacted their portion of the Fund's performance during the year relative to the Performance Index. TOP PERFORMANCE CONTRIBUTORS In aggregate | sector allocations; country allocations Allocations in the following sectors | information technology; consumer staples; utilities Security selection in the following sectors | financials; information technology Position weightings | Samsung Electronics Co., Ltd. GDR; Samsung Electronics Co., Ltd.; SK Hynix, Inc. Exposure to the following countries | Taiwan; Kuwait; India TOP PERFORMANCE DETRACTORS In aggregate | position weightings Allocations in the following sectors | energy; communication services; materials Security selection in the following sectors | materials; communication services; consumer discretionary Position weightings | Samsung Electronics Co., Ltd. (Preference Shares); Tencent Holdings, Ltd.; SK Square Co., Ltd. Exposure to the following countries | China; Thailand; Brazil
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| Performance Past Does Not Indicate Future [Text] | The Fund ’s past performance is not a good predictor of how the Fund will perform in the future. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] | Fund Performance The following graph compares a $10,000 initial investment in the Fund to the index(es) listed below for the last 10 fiscal years of the Fund. GROWTH OF $10,000 |
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| Average Annual Return [Table Text Block] |
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| 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. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Jan. 01, 2026 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 949,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 577 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 6,400,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 127.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics The following table outlines key fund statistics.
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| Holdings [Text Block] | Graphical Representation of Holdings The information below represents the composition of the Fund's net assets as of the end of the period. Top Industries*
Portfolio Composition Country * Percentages exclude derivatives (other than purchased options), if any.
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| Material Fund Change [Text Block] | Material Fund Changes This is a summary of certain changes to the Fund since the beginning of the period. Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. Additionally, on March 26, 2026, Corebridge Financial, Inc. and Equitable Holdings, Inc. (“EQH”) announced that they have entered into a definitive agreement to merge (the “Transaction”). The Transaction is expected to close by the end of 2026, subject to customary closing conditions, including the receipt of requisite regulatory approvals and approval of the shareholders of both Corebridge Financial, Inc. and EQH. Under the 1940 Act, an investment advisory agreement between a registered investment company, such as VC I, and its investment adviser must include a provision providing for its automatic termination upon its “assignment” (as defined in the 1940 Act). The closing of the Transaction may be deemed to cause an “assignment” of the Investment Advisory Agreement between VC I, on behalf of each Fund, and VALIC. As a result, the closing of the Transaction may cause the Investment Advisory Agreement to terminate automatically in accordance with its terms. It is anticipated that, prior to the closing of the Transaction, VC I’s Board of Directors (the “Board”) will consider a new investment advisory agreement between VC I, on behalf of each Fund, and VALIC. If approved by the Board, the new investment advisory agreement will be presented to the Funds’ shareholders for approval, and, if approved by shareholders, it will take effect upon the closing of the Transaction. Effective September 29, 2025, Quantitative Investing Risk was added as a principal risk of the Fund. For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542.
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| Material Fund Change Risks Change [Text Block] | Effective September 29, 2025, Quantitative Investing Risk was added as a principal risk of the Fund. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Adviser [Text Block] | Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Accountant Change Disagreements [Text Block] | Changes in and Disagreements with Accountants There were no changes in or disagreements with the accountants during the period.
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| C000022846 [Member] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | Global Strategy | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Global Strategy | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | VGLSX | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the VALIC Company I Global Strategy Fund (the “Fund”) for the period of June 1, 2025 to May 31, 2026. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by contacting us at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period.
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| Additional Information Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] | Fund Expenses What were the Fund costs for the last year ? (Based on a hypothetical $10,000 investment)
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| Expenses Paid, Amount | $ 71 | [21] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.63% | [21] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS The Fund posted a return of 26.24% for the year ended May 31, 2026, compared to a return of 30.27% for the MSCI ACWI Index (net) (a broad-based securities market index) and 19.19% for the Blended Index (the "Performance Index") comprised of 60% MSCI ACWI Index (net); 40% Bloomberg Global Aggregate Index (USD hedged). Over the 12-month period, U.S. equities slightly outperformed international developed equities and underperformed emerging markets equities. The global fixed income market posted broadly positive results over the one-year period, supported by strong performance in 2025 driven by declining yields, tighter credit spreads, and higher starting income levels. However, returns became more uneven in early 2026 as persistent inflation, geopolitical risks, and shifting expectations for central bank policy led to higher volatility and upward pressure on yields. Overall, the environment transitioned from broad, rate-driven gains to a more selective, income-oriented market with greater dispersion across sectors and regions. The following is a summary, by subadviser, of the top contributors and detractors that impacted their portion of the Fund's performance during the year relative to the Performance Index. TOP PERFORMANCE CONTRIBUTORS Brandywine Global Investments, LLC - Global Debt portion | In aggregate: yield curve. Allocations in the following sectors: U.S. corporate credit; U.S. agency mortgage-backed securities; emerging markets sovereign debt. Exposure to the following countries: United States; Brazil; Mexico Franklin Advisers, Inc. - Global Equity portion | In aggregate: country allocations; position weightings. Allocations in the following sectors: Information technology; financials; consumer discretionary. Security selection in the following sectors: Information technology; communication services; materials. Position weightings: Micron Technology, Inc.; SK Hynix, Inc.; Samsung Electronics Co., Ltd. Exposure to the following countries: South Korea; United States; Germany TOP PERFORMANCE DETRACTORS Brandywine Global Investments, LLC - Global Debt portion | Allocations in the following sectors: UK bond futures. Exposure to the following countries: China; Japan; United Kingdom Franklin Advisers, Inc. - Global Equity portion | Allocations in the following sectors: health care; cash; energy. Security selection in the following sectors: real estate. Position weightings: Adobe, Inc.; Booking Holdings, Inc.; 3i Group PLC. Exposure to the following countries: Netherlands; United Kingdom; United Arab Emirates
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| Performance Past Does Not Indicate Future [Text] | The Fund ’s past performance is not a good predictor of how the Fund will perform in the future. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] | Fund Performance The following graph compares a $10,000 initial investment in the Fund to the index(es) listed below for the last 10 fiscal years of the Fund. GROWTH OF $10,000 |
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| Average Annual Return [Table Text Block] |
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| 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. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Jan. 01, 2026 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 247,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 612 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 1,000,000.0 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 55.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics The following table outlines key fund statistics.
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| Holdings [Text Block] | Graphical Representation of Holdings The information below represents the composition of the Fund's net assets as of the end of the period. Top Industries*
Portfolio Composition Country * Percentages exclude derivatives (other than purchased options), if any.
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| Material Fund Change [Text Block] | Material Fund Changes This is a summary of certain changes to the Fund since the beginning of the period. Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. Additionally, on March 26, 2026, Corebridge Financial, Inc. and Equitable Holdings, Inc. (“EQH”) announced that they have entered into a definitive agreement to merge (the “Transaction”). The Transaction is expected to close by the end of 2026, subject to customary closing conditions, including the receipt of requisite regulatory approvals and approval of the shareholders of both Corebridge Financial, Inc. and EQH. Under the 1940 Act, an investment advisory agreement between a registered investment company, such as VC I, and its investment adviser must include a provision providing for its automatic termination upon its “assignment” (as defined in the 1940 Act). The closing of the Transaction may be deemed to cause an “assignment” of the Investment Advisory Agreement between VC I, on behalf of each Fund, and VALIC. As a result, the closing of the Transaction may cause the Investment Advisory Agreement to terminate automatically in accordance with its terms. It is anticipated that, prior to the closing of the Transaction, VC I’s Board of Directors (the “Board”) will consider a new investment advisory agreement between VC I, on behalf of each Fund, and VALIC. If approved by the Board, the new investment advisory agreement will be presented to the Funds’ shareholders for approval, and, if approved by shareholders, it will take effect upon the closing of the Transaction. Effective September 29, 2025, the subadviser to the Fund made certain changes to the Fund’s investment strategies with respect to the subadviser’s multi-factor selection process. For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542.
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| Material Fund Change Strategies [Text Block] | Effective September 29, 2025, the subadviser to the Fund made certain changes to the Fund’s investment strategies with respect to the subadviser’s multi-factor selection process. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Adviser [Text Block] | Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Accountant Change Disagreements [Text Block] | Changes in and Disagreements with Accountants There were no changes in or disagreements with the accountants during the period.
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| C000022849 [Member] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | Small Cap Core | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Small Cap Core | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | VSSVX | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the VALIC Company I Small Cap Core Fund (the “Fund”) for the period of June 1, 2025 to May 31, 2026. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by contacting us at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] |
This report describes changes to the Fund that occurred during the reporting period.
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| Additional Information Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] |
Fund Expenses
What were the Fund costs for the last year ?
(Based on a hypothetical $10,000 investment)
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| Expenses Paid, Amount | $ 99 | [22] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.91% | [22] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] |
Management’s Discussion of Fund Performance
SUMMARY OF RESULTS
The Fund posted a return of 17.83% for the year ended May 31, 2026, compared to a return of 29.45% for the Russell 3000® Index (a broad-based securities market index) and 43.08% for Russell 2000® Index (the "Performance Index") and 44.36% for the Russell 2000® Value Index (prior Performance Index). Over the period, U.S. small-cap equities outperformed large- and mid-cap equities, according to the Russell® family of indices. Value-oriented stocks outperformed growth stocks across the market-cap spectrum.
The following is a summary of the top contributors and detractors that impacted the Fund's performance during the year relative to the Performance Index.
TOP PERFORMANCE CONTRIBUTORS
Allspring Global Investments, LLC - see Material Fund Changes for the time period covered | In aggregate: sector allocations. Allocations in the following sectors: materials; real estate; utilities. Security selection in the following sectors: consumer discretionary; utilities. Position weightings: Mueller Industries, Inc.; Douglas Dynamics, Inc.; Chord Energy Corp.
Invesco Advisers, Inc. - see Material Fund Changes for the time period covered | Allocations in the following sectors: utilities; health care; cash. Security selection in the following sectors: health care; consumer discretionary; utilities. Position weightings: Guardant Health, Inc.; Lattice Semiconductor Corp.; BrightSpring Health Services, Inc.
TOP PERFORMANCE DETRACTORS
Allspring Global Investments, LLC - see Material Fund Changes for the time period covered | In aggregate: position weightings. Allocations in the following sectors: consumer staples; energy; cash. Security selection in the following sectors: materials; information technology; health care. Position weightings: J&J Snack Foods Corp.; Silgan Holdings, Inc.; Innospec, Inc.
Invesco Advisers, Inc. - see Material Fund Changes for the time period covered | Allocations in the following sectors: consumer discretionary; information technology; financials. Security selection in the following sectors: industrials; real estate; financials. Position weightings: lack of position in IonQ, Inc.; Atmus Filtration Technologies, Inc.; Northern Oil & Gas, Inc.
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| Performance Past Does Not Indicate Future [Text] | The Fund ’s past performance is not a good predictor of how the Fund will perform in the future. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] |
Fund Performance
The following graph compares a $10,000 initial investment in the Fund to the index(es) listed below for the last 10 fiscal years of the Fund.
GROWTH OF $10,000
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| Average Annual Return [Table Text Block] |
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| 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. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Jan. 01, 2026 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 173,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 104 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 1,200,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 124.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] |
Key Fund Statistics
The following table outlines key fund statistics.
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| Holdings [Text Block] |
Graphical Representation of Holdings
The information below represents the composition of the Fund's net assets as of the end of the period.
Top Industries*
Portfolio Composition
* Percentages exclude derivatives (other than purchased options), if any.
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| Material Fund Change [Text Block] | Material Fund Changes This is a summary of certain changes to the Fund since the beginning of the period. Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. Additionally, on March 26, 2026, Corebridge Financial, Inc. and Equitable Holdings, Inc. (“EQH”) announced that they have entered into a definitive agreement to merge (the “Transaction”). The Transaction is expected to close by the end of 2026, subject to customary closing conditions, including the receipt of requisite regulatory approvals and approval of the shareholders of both Corebridge Financial, Inc. and EQH. Under the 1940 Act, an investment advisory agreement between a registered investment company, such as VC I, and its investment adviser must include a provision providing for its automatic termination upon its “assignment” (as defined in the 1940 Act). The closing of the Transaction may be deemed to cause an “assignment” of the Investment Advisory Agreement between VC I, on behalf of each Fund, and VALIC. As a result, the closing of the Transaction may cause the Investment Advisory Agreement to terminate automatically in accordance with its terms. It is anticipated that, prior to the closing of the Transaction, VC I’s Board of Directors (the “Board”) will consider a new investment advisory agreement between VC I, on behalf of each Fund, and VALIC. If approved by the Board, the new investment advisory agreement will be presented to the Funds’ shareholders for approval, and, if approved by shareholders, it will take effect upon the closing of the Transaction. Effective September 29, 2025, the Fund entered into a contractual advisory fee waiver agreement with VALIC to lower the advisory fee rate payable by the Fund to VALIC to 0.72% of the Fund’s average daily net assets on the first $500 million and 0.67% of the Fund’s average daily net assets over $500 million. Effective April 30, 2026, Invesco Advisers, Inc. (“Invesco) was appointed as subadviser to the Fund, replacing the existing subadviser, Allspring Global Investments, LLC. In connection with Invesco’s appointment, the Fund’s investment objective, investment strategies and techniques were revised to reflect the investment strategies and techniques used by Invesco. As a result of these changes, Real Estate Investment Trusts Risk was added as a principal risk, and Value Style Risk was removed as a principal risk. Also effective April 30, 2026, the Fund’s contractual advisory fee waiver was amended to lower the advisory fee rate payable by the Fund to VALIC to 0.64% of the Fund’s average daily net assets on the first $500 million and 0.59% of the Fund’s average daily net assets over $500 million. In addition, the Fund changed its name from the “Small Cap Special Values Fund” to the “Small Cap Core Fund.” For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542.
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| Material Fund Change Name [Text Block] | In addition, the Fund changed its name from the “Small Cap Special Values Fund” to the “Small Cap Core Fund.” | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Expenses [Text Block] | Effective September 29, 2025, the Fund entered into a contractual advisory fee waiver agreement with VALIC to lower the advisory fee rate payable by the Fund to VALIC to 0.72% of the Fund’s average daily net assets on the first $500 million and 0.67% of the Fund’s average daily net assets over $500 million. Effective April 30, 2026, Invesco Advisers, Inc. (“Invesco) was appointed as subadviser to the Fund, replacing the existing subadviser, Allspring Global Investments, LLC. In connection with Invesco’s appointment, the Fund’s investment objective, investment strategies and techniques were revised to reflect the investment strategies and techniques used by Invesco. As a result of these changes, Real Estate Investment Trusts Risk was added as a principal risk, and Value Style Risk was removed as a principal risk. Also effective April 30, 2026, the Fund’s contractual advisory fee waiver was amended to lower the advisory fee rate payable by the Fund to VALIC to 0.64% of the Fund’s average daily net assets on the first $500 million and 0.59% of the Fund’s average daily net assets over $500 million. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Adviser [Text Block] | Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Accountant Change Disagreements [Text Block] |
Changes in and Disagreements with Accountants
There were no changes in or disagreements with the accountants during the period.
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| C000022851 [Member] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | Growth | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Growth | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | VCULX | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the VALIC Company I Growth Fund (the “Fund”) for the period of June 1, 2025 to May 31, 2026. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by contacting us at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period.
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| Additional Information Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] | Fund Expenses What were the Fund costs for the last year ? (Based on a hypothetical $10,000 investment)
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| Expenses Paid, Amount | $ 70 | [23] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.61% | [23] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS The Fund posted a return of 28.81% for the year ended May 31, 2026, compared to a return of 29.78% for the S&P 500® Index (a broad-based securities market index) and 28.66% for the Russell 1000® Growth Index (the "Performance Index"). Over the period, U.S. equities advanced, with technology-heavy and growth-oriented benchmarks leading the market. Smaller-cap equities also rose, while mid-cap growth lagged value-oriented benchmarks. Growth-oriented stocks modestly outperformed value overall, though leadership broadened over time, and rising macro uncertainty and higher rates drove rotations into value and defensive sectors at times. The following is a summary, by subadviser, of the top contributors and detractors that impacted their portion of the Fund's performance during the year relative to the Performance Index. TOP PERFORMANCE CONTRIBUTORS BlackRock Investment Management, LLC (active) | In aggregate: sector allocations. Allocations in the following sectors: consumer staples; financials; industrials. Security selection in the following sectors: information technology; consumer discretionary. Position weightings: Intel Corp.; Datadog, Inc., Class A; Lam Research Corp. BlackRock Investment Management, LLC (passive) | Allocations in the following sectors: information technology; communication services; consumer discretionary. Position weightings: NVIDIA Corp.; Apple, Inc.; Broadcom, Inc. TOP PERFORMANCE DETRACTORS BlackRock Investment Management, LLC (active) | Allocations in the following sectors: real estate; materials; cash. Security selection in the following sectors: communication services; industrials; financials. Position weightings: Alphabet, Inc., Class C; Advanced Micro Devices, Inc.; Apple, Inc. BlackRock Investment Management, LLC (passive) | Allocations in the following sectors: financials; utilities; materials. Position weightings: Netflix, Inc.; Intuit, Inc.; ServiceNow, Inc.
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| Performance Past Does Not Indicate Future [Text] | The Fund ’s past performance is not a good predictor of how the Fund will perform in the future. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] | Fund Performance The following graph compares a $10,000 initial investment in the Fund to the index(es) listed below for the last 10 fiscal years of the Fund. GROWTH OF $10,000 |
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| Average Annual Return [Table Text Block] |
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| 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. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Jan. 01, 2026 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 1,682,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 390 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 9,000,000.0 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 88.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics The following table outlines key fund statistics.
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| Holdings [Text Block] | Graphical Representation of Holdings The information below represents the composition of the Fund's net assets as of the end of the period. Top Industries*
Portfolio Composition * Percentages exclude derivatives (other than purchased options), if any.
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| Material Fund Change [Text Block] | Material Fund Changes This is a summary of certain changes to the Fund since the beginning of the period. Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. Additionally, on March 26, 2026, Corebridge Financial, Inc. and Equitable Holdings, Inc. (“EQH”) announced that they have entered into a definitive agreement to merge (the “Transaction”). The Transaction is expected to close by the end of 2026, subject to customary closing conditions, including the receipt of requisite regulatory approvals and approval of the shareholders of both Corebridge Financial, Inc. and EQH. Under the 1940 Act, an investment advisory agreement between a registered investment company, such as VC I, and its investment adviser must include a provision providing for its automatic termination upon its “assignment” (as defined in the 1940 Act). The closing of the Transaction may be deemed to cause an “assignment” of the Investment Advisory Agreement between VC I, on behalf of each Fund, and VALIC. As a result, the closing of the Transaction may cause the Investment Advisory Agreement to terminate automatically in accordance with its terms. It is anticipated that, prior to the closing of the Transaction, VC I’s Board of Directors (the “Board”) will consider a new investment advisory agreement between VC I, on behalf of each Fund, and VALIC. If approved by the Board, the new investment advisory agreement will be presented to the Funds’ shareholders for approval, and, if approved by shareholders, it will take effect upon the closing of the Transaction. For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542.
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| Material Fund Change Adviser [Text Block] | Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Accountant Change Disagreements [Text Block] | Changes in and Disagreements with Accountants There were no changes in or disagreements with the accountants during the period.
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| C000059956 [Member] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | Global Real Estate | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Global Real Estate | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | VGREX | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the VALIC Company I Global Real Estate Fund (the “Fund”) for the period of June 1, 2025 to May 31, 2026. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by contacting us at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period.
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| Additional Information Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] | Fund Expenses What were the Fund costs for the last year ? (Based on a hypothetical $10,000 investment)
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| Expenses Paid, Amount | $ 96 | [24] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.91% | [24] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS The Fund posted a return of 11.35% for the year ended May 31, 2026, compared to a return of 30.27% for the MSCI ACWI Index (net) (a broad-based securities market index) and 13.28% for the FTSE EPRA/NAREIT Developed Index (the "Performance Index"). Global real estate markets delivered positive but uneven returns amid elevated interest rates, moderating inflation, and episodic geopolitical volatility. Performance favored secular growth sectors such as data centers and health care, while rate-sensitive areas like residential and certain office segments lagged. The following is a summary, by subadviser, of the top contributors and detractors that impacted their portion of the Fund's performance during the year relative to the Performance Index. TOP PERFORMANCE CONTRIBUTORS Duff & Phelps Investment Management Company | Allocations in the following industries: data centers; specialty; health care. Security selection in the following industries: diversified; data centers; specialty. Position weightings: Merlin Properties Socimi SA; Welltower, Inc.; Mitsubishi Estate Co., Ltd. Exposure to the following countries: Australia; Spain; Japan Massachusetts Financial Services Company | Allocations in the following industries: real estate operating companies; other specialized REITS; asset management & custody banks. Security selection in the following industries: Health care REITS; single-family residential REITS; other specialized REITS. Position weightings: Healthcare Realty Trust, Inc.; lack of position in AvalonBay Communities, Inc.; Ventas, Inc. Exposure to the following countries: lack of exposure to Sweden; France; Germany TOP PERFORMANCE DETRACTORS Duff & Phelps Investment Management Company | Allocations in the following sectors: residential; telecommunication REITs; diversified. Security selection in the following sectors: residential; lodging/resorts; health care. Position weightings: UNITE Group PLC; American Homes 4 Rent, Class A; American Tower Corp. Exposure to the following countries: United Kingdom; United States; Singapore Massachusetts Financial Services Company | In aggregate: country allocations; position weightings; sector allocations. Allocations in the following industries: health care REITS; single-family residential REITS; office REITS. Security selection in the following industries: industrial REITS; self-storage REITS; multi-family residential REITS. Position weightings: lack of position in Welltower, Inc.; Shurgard Self Storage, Ltd.; Grainger PLC. Exposure to the following countries: Hong Kong; United Kingdom; United States
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| Performance Past Does Not Indicate Future [Text] | The Fund ’s past performance is not a good predictor of how the Fund will perform in the future. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] | Fund Performance The following graph compares a $10,000 initial investment in the Fund to the index(es) listed below for the last 10 fiscal years of the Fund. GROWTH OF $10,000 |
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| Average Annual Return [Table Text Block] |
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| 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. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Jan. 01, 2026 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 324,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 89 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 2,000,000.0 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 26.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics The following table outlines key fund statistics.
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| Holdings [Text Block] | Graphical Representation of Holdings The information below represents the composition of the Fund's net assets as of the end of the period. Top Industries*
Portfolio Composition Country * Percentages exclude derivatives (other than purchased options), if any.
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| Material Fund Change [Text Block] | Material Fund Changes This is a summary of certain changes to the Fund since the beginning of the period. Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. Additionally, on March 26, 2026, Corebridge Financial, Inc. and Equitable Holdings, Inc. (“EQH”) announced that they have entered into a definitive agreement to merge (the “Transaction”). The Transaction is expected to close by the end of 2026, subject to customary closing conditions, including the receipt of requisite regulatory approvals and approval of the shareholders of both Corebridge Financial, Inc. and EQH. Under the 1940 Act, an investment advisory agreement between a registered investment company, such as VC I, and its investment adviser must include a provision providing for its automatic termination upon its “assignment” (as defined in the 1940 Act). The closing of the Transaction may be deemed to cause an “assignment” of the Investment Advisory Agreement between VC I, on behalf of each Fund, and VALIC. As a result, the closing of the Transaction may cause the Investment Advisory Agreement to terminate automatically in accordance with its terms. It is anticipated that, prior to the closing of the Transaction, VC I’s Board of Directors (the “Board”) will consider a new investment advisory agreement between VC I, on behalf of each Fund, and VALIC. If approved by the Board, the new investment advisory agreement will be presented to the Funds’ shareholders for approval, and, if approved by shareholders, it will take effect upon the closing of the Transaction. Effective September 28, 2026, Duff & Phelps Investment Management Co. (“Duff & Phelps”), an existing subadviser to the Fund, will replace Massachusetts Financial Services Company as a subadviser to a portion of the Fund, making Duff & Phelps the sole subadviser to the Fund. In connection with Duff & Phelps’s appointment, the Fund’s investment strategies and techniques will be revised to reflect the current investment strategies and techniques used by Duff & Phelps. For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542.
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| Material Fund Change Strategies [Text Block] | In connection with Duff & Phelps’s appointment, the Fund’s investment strategies and techniques will be revised to reflect the current investment strategies and techniques used by Duff & Phelps. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Adviser [Text Block] | Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator.Effective September 28, 2026, Duff & Phelps Investment Management Co. (“Duff & Phelps”), an existing subadviser to the Fund, will replace Massachusetts Financial Services Company as a subadviser to a portion of the Fund, making Duff & Phelps the sole subadviser to the Fund. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Accountant Change Disagreements [Text Block] | Changes in and Disagreements with Accountants There were no changes in or disagreements with the accountants during the period.
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| C000121199 [Member] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | Dynamic Allocation | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Dynamic Allocation | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | VDAFX | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the VALIC Company I Dynamic Allocation Fund (the “Fund”) for the period of June 1, 2025 to May 31, 2026. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by contacting us at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period.
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| Additional Information Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] | Fund Expenses What were the Fund costs for the last year ? (Based on a hypothetical $10,000 investment)
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| Expenses Paid, Amount | $ 38 | [25] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.35% | [25] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS The Fund consists of two components: A fund-of-funds component representing investments in VC I Funds, and an overlay component which invests in cash, treasuries, and futures, to manage the Fund's net equity exposure. The Fund posted a return of 16.62% for the year ended May 31, 2026, compared to a return of 29.78% S&P 500® Index (a broad-based securities market index) and 19.53% for the Blended Index (the "Performance Index") comprised of 60% S&P 500® Index; 40% Bloomberg U.S. Aggregate Bond Index. Equity markets surged during the period, helped by easing trade concerns, optimism around AI, and expectations for rate cuts by the Federal Reserve. Stocks were broadly higher, led by small-cap companies. Heightened geopolitical tensions, particularly surrounding Iran and broader Middle East instability, contributed to intermittent market volatility, while the Federal Reserve held rates steady amid mixed inflation signals. The following is a summary, by subadviser, of the top contributors and detractors that impacted their portion of the Fund's performance during the year relative to the Performance Index. TOP PERFORMANCE CONTRIBUTORS AllianceBernstein, L.P. (overlay) | Allocations in the following strategies: tactical equity; equity futures contracts used to adjust exposures and manage risk of the Fund AllianceBernstein, L.P. (fund of funds)- see Material Fund Changes for the time period covered | Allocations in the following sectors: growth equities; value equities . Allocation to the following funds: Stock Index Fund; Systematic Value Fund; Nasdaq-100 Index Fund SunAmerica Asset Management, LLC - see Material Fund Changes for the time period covered | Allocations in the following sectors: small cap equity. Allocation to the following funds: Systematic Growth Fund; Core Bond Fund; Capital Appreciation Fund TOP PERFORMANCE DETRACTORS AllianceBernstein, L.P. (overlay) | Allocations in the following strategies: option overlay; fixed income AllianceBernstein, L.P. (fund of funds)- see Material Fund Changes for the time period covered | Allocations in the following sectors: core equities. Allocation to the following funds: None SunAmerica Asset Management, LLC - see Material Fund Changes for the time period covered | Allocations in the following sectors: international equity; mid-cap equity; global real estate. Allocation to the following funds: Systematic Value Fund; Dividend Value Fund; Large Cap Core Fund (formerly Large Capital Growth Fund)
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| Performance Past Does Not Indicate Future [Text] | The Fund ’s past performance is not a good predictor of how the Fund will perform in the future. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] | Fund Performance The following graph compares a $10,000 initial investment in the Fund to the index(es) listed below for the last 10 fiscal years of the Fund. GROWTH OF $10,000 |
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| Average Annual Return [Table Text Block] |
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| 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. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Jan. 01, 2026 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 124,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 48 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 300,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 58.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics The following table outlines key fund statistics.
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| Holdings [Text Block] | Graphical Representation of Holdings The information below represents the composition of the Fund's net assets as of the end of the period. Portfolio Composition |
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| Material Fund Change [Text Block] | Material Fund Changes This is a summary of certain changes to the Fund since the beginning of the period. Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. Additionally, on March 26, 2026, Corebridge Financial, Inc. and Equitable Holdings, Inc. (“EQH”) announced that they have entered into a definitive agreement to merge (the “Transaction”). The Transaction is expected to close by the end of 2026, subject to customary closing conditions, including the receipt of requisite regulatory approvals and approval of the shareholders of both Corebridge Financial, Inc. and EQH. Under the 1940 Act, an investment advisory agreement between a registered investment company, such as VC I, and its investment adviser must include a provision providing for its automatic termination upon its “assignment” (as defined in the 1940 Act). The closing of the Transaction may be deemed to cause an “assignment” of the Investment Advisory Agreement between VC I, on behalf of each Fund, and VALIC. As a result, the closing of the Transaction may cause the Investment Advisory Agreement to terminate automatically in accordance with its terms. It is anticipated that, prior to the closing of the Transaction, VC I’s Board of Directors (the “Board”) will consider a new investment advisory agreement between VC I, on behalf of each Fund, and VALIC. If approved by the Board, the new investment advisory agreement will be presented to the Funds’ shareholders for approval, and, if approved by shareholders, it will take effect upon the closing of the Transaction. Effective September 29, 2025, AllianceBernstein L.P. (“AllianceBernstein“), an existing subadviser to the Fund, replaced SunAmerica Asset Management, LLC as the subadviser to the Fund’s Fund-of-Funds Component, making AllianceBernstein the sole subadviser to the Fund. In connection with AllianceBernstein’s appointment, the Fund’s investment strategies and techniques were revised to reflect the current investment strategies and techniques used by AllianceBernstein. As a result, Affiliated Fund Risk was removed as a principal risk of the Fund. In addition, the Fund entered into a voluntary advisory fee waiver agreement with VALIC to lower the advisory fee rate payable by the Fund to VALIC in connection with the Fund’s investment in an AllianceBernstein-advised money market fund. For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542.
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| Material Fund Change Strategies [Text Block] | In connection with AllianceBernstein’s appointment, the Fund’s investment strategies and techniques were revised to reflect the current investment strategies and techniques used by AllianceBernstein. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Risks Change [Text Block] | As a result, Affiliated Fund Risk was removed as a principal risk of the Fund. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Adviser [Text Block] | Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Accountant Change Disagreements [Text Block] | Changes in and Disagreements with Accountants There were no changes in or disagreements with the accountants during the period.
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| C000222575 [Member] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | Aggressive Allocation Lifestyle | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Aggressive Allocation Lifestyle | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | VLAGX | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the VALIC Company I Aggressive Allocation Lifestyle Fund (the “Fund”) for the period of June 1, 2025 to May 31, 2026. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by contacting us at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period.
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| Additional Information Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] | Fund Expenses What were the Fund costs for the last year ? (Based on a hypothetical $10,000 investment)
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| Expenses Paid, Amount | $ 11 | [26] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.10% | [26] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS The Aggressive Allocation Lifestyle Fund invests in a combination of affiliated funds, also known as “fund of funds.” The Fund does not select specific sectors, securities, or countries and thus these factors do not influence performance. Rather, the key indicators of performance are asset allocation and manager selection. The Fund posted a return of 21.58% for the year ended May 31, 2026, compared to 29.78% for the S&P 500® Index (a broad-based securities market index) and 21.93% for the Blended Index (the "Performance Index") comprised of 56% Russell 3000® Index; 19% MSCI EAFE Index (net); 25% Bloomberg U.S. Aggregate Bond Index. Over the period, emerging market equities outperformed U.S. equities and international developed equities. Credit markets showed resilience, particularly in high yield segments. The following is a summary of the top contributors and detractors that impacted the Fund's performance during the year relative to the Performance Index. TOP PERFORMANCE CONTRIBUTORS Allocations in the following funds | Core Bond Fund; High Yield Fund TOP PERFORMANCE DETRACTORS Allocations in the following funds | Large Cap Core Fund; Small Cap Growth Fund; Systematic Value Fund
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| Performance Past Does Not Indicate Future [Text] | The Fund ’s past performance is not a good predictor of how the Fund will perform in the future. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] | Fund Performance The following graph compares a $10,000 initial investment in the Fund to the index(es) listed below for the last 10 fiscal years of the Fund. GROWTH OF $10,000 |
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| Average Annual Return [Table Text Block] |
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| 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. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Jan. 01, 2026 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 789,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 12 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 500,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 25.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics The following table outlines key fund statistics.
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| Holdings [Text Block] | Graphical Representation of Holdings The information below represents the composition of the Fund's net assets as of the end of the period. Portfolio Composition |
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| Material Fund Change [Text Block] | Material Fund Changes This is a summary of certain changes to the Fund since the beginning of the period. Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. Additionally, on March 26, 2026, Corebridge Financial, Inc. and Equitable Holdings, Inc. (“EQH”) announced that they have entered into a definitive agreement to merge (the “Transaction”). The Transaction is expected to close by the end of 2026, subject to customary closing conditions, including the receipt of requisite regulatory approvals and approval of the shareholders of both Corebridge Financial, Inc. and EQH. Under the 1940 Act, an investment advisory agreement between a registered investment company, such as VC I, and its investment adviser must include a provision providing for its automatic termination upon its “assignment” (as defined in the 1940 Act). The closing of the Transaction may be deemed to cause an “assignment” of the Investment Advisory Agreement between VC I, on behalf of each Fund, and VALIC. As a result, the closing of the Transaction may cause the Investment Advisory Agreement to terminate automatically in accordance with its terms. It is anticipated that, prior to the closing of the Transaction, VC I’s Board of Directors (the “Board”) will consider a new investment advisory agreement between VC I, on behalf of each Fund, and VALIC. If approved by the Board, the new investment advisory agreement will be presented to the Funds’ shareholders for approval, and, if approved by shareholders, it will take effect upon the closing of the Transaction. Effective September 29, 2025, the Fund changed its name from the “Aggressive Growth Lifestyle Fund” to the “Aggressive Allocation Lifestyle Fund.” For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542.
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| Material Fund Change Name [Text Block] | Effective September 29, 2025, the Fund changed its name from the “Aggressive Growth Lifestyle Fund” to the “Aggressive Allocation Lifestyle Fund.” | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Adviser [Text Block] | Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Accountant Change Disagreements [Text Block] | Changes in and Disagreements with Accountants There were no changes in or disagreements with the accountants during the period.
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| C000222576 [Member] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | U.S. Socially Responsible | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | U.S. Socially Responsible | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | VSRDX | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the VALIC Company I U.S. Socially Responsible Fund (the “Fund”) for the period of June 1, 2025 to May 31, 2026. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by contacting us at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] |
This report describes changes to the Fund that occurred during the reporting period.
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| Additional Information Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] |
Fund Expenses
What were the Fund costs for the last year ?
(Based on a hypothetical $10,000 investment)
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| Expenses Paid, Amount | $ 40 | [27] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.36% | [27] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] |
Management’s Discussion of Fund Performance
SUMMARY OF RESULTS
The Fund is an optimized portfolio which seeks to track the S&P 500® Index while investing in socially responsive companies. The Fund's criteria do not permit investment in companies whose businesses rely significantly on alcohol, firearms, gambling, tobacco, nuclear power, or production of weaponry. Furthermore, companies deemed to have poor labor/employee relations or environmental records are also screened out of the investable universe. These criteria may create differences in Fund performance relative to the Benchmark.
The Fund posted a return of 24.86% for the year ended May 31, 2026, compared to a return of 29.78% for the S&P 500® Index (a broad-based securities market & "Performance Index"). Over the period, U.S. equities advanced, with technology-heavy and growth-oriented benchmarks leading the market. Smaller-cap equities also rose, while mid-cap growth lagged value-oriented benchmarks.
The following is a summary of the top contributors and detractors that impacted the Fund's performance during the year relative to the Performance Index.
TOP PERFORMANCE CONTRIBUTORS
In aggregate | sector allocations
Allocations in the following sectors | information technology; consumer staples; health care
Security selection in the following sectors | information technology; real estate
Position weightings | Western Digital Corp.; lack of position in Microsoft Corp.; Seagate Technology Holdings PLC
TOP PERFORMANCE DETRACTORS
In aggregate | position weightings
Allocations in the following sectors | financials; communication services; real estate
Security selection in the following sectors | communication services; financials, health care
Position weightings | lack of position in Alphabet, Inc., Class A; lack of position in Alphabet, Inc., Class C; Apple, Inc.
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| Performance Past Does Not Indicate Future [Text] | The Fund ’s past performance is not a good predictor of how the Fund will perform in the future. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] |
Fund Performance
The following graph compares a $10,000 initial investment in the Fund to the index(es) listed below for the last 10 fiscal years of the Fund.
GROWTH OF $10,000
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| Average Annual Return [Table Text Block] |
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| 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. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Jan. 01, 2026 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 420,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 162 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 1,200,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 8.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] |
Key Fund Statistics
The following table outlines key fund statistics.
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| Holdings [Text Block] |
Graphical Representation of Holdings
The information below represents the composition of the Fund's net assets as of the end of the period.
Top Industries*
Portfolio Composition
* Percentages exclude derivatives (other than purchased options), if any.
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| Material Fund Change [Text Block] |
Material Fund Changes
This is a summary of certain changes to the Fund since the beginning of the period. Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. Additionally, on March 26, 2026, Corebridge Financial, Inc. and Equitable Holdings, Inc. (“EQH”) announced that they have entered into a definitive agreement to merge (the “Transaction”). The Transaction is expected to close by the end of 2026, subject to customary closing conditions, including the receipt of requisite regulatory approvals and approval of the shareholders of both Corebridge Financial, Inc. and EQH. Under the 1940 Act, an investment advisory agreement between a registered investment company, such as VC I, and its investment adviser must include a provision providing for its automatic termination upon its “assignment” (as defined in the 1940 Act). The closing of the Transaction may be deemed to cause an “assignment” of the Investment Advisory Agreement between VC I, on behalf of each Fund, and VALIC. As a result, the closing of the Transaction may cause the Investment Advisory Agreement to terminate automatically in accordance with its terms. It is anticipated that, prior to the closing of the Transaction, VC I’s Board of Directors (the “Board”) will consider a new investment advisory agreement between VC I, on behalf of each Fund, and VALIC. If approved by the Board, the new investment advisory agreement will be presented to the Funds’ shareholders for approval, and, if approved by shareholders, it will take effect upon the closing of the Transaction. For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542.
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| Material Fund Change Adviser [Text Block] | Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Accountant Change Disagreements [Text Block] |
Changes in and Disagreements with Accountants
There were no changes in or disagreements with the accountants during the period.
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| C000222577 [Member] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | Capital Appreciation | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Capital Appreciation | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | VAPPX | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the VALIC Company I Capital Appreciation Fund (the “Fund”) for the period of June 1, 2025 to May 31, 2026. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by contacting us at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] |
This report describes changes to the Fund that occurred during the reporting period.
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| Additional Information Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] |
Fund Expenses
What were the Fund costs for the last year ?
(Based on a hypothetical $10,000 investment)
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| Expenses Paid, Amount | $ 77 | [28] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.68% | [28] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] |
Management’s Discussion of Fund Performance
SUMMARY OF RESULTS
The Fund posted a return of 25.21% for the year ended May 31, 2026, compared to a return of 29.78% for the S&P 500® Index (a broad-based securities market index) and 28.66% for the Russell 1000® Growth Index (the "Performance Index"). U.S. large cap stocks delivered strong gains of roughly ~25–28%, extending the large-cap rally driven by mega-cap and growth stocks. Performance remained highly concentrated in the largest companies, particularly technology-oriented firms tied to AI and innovation themes, although early 2026 saw increased volatility and some rotation toward value amid geopolitical and rate uncertainty.
The following is a summary of the top contributors and detractors that impacted the Fund's performance during the year relative to the Performance Index.
TOP PERFORMANCE CONTRIBUTORS
Allocations in the following sectors | consumer staples; energy; real estate
Security selection in the following sectors | financials; health care; communication services
Position weightings | Advanced Micro Devices, Inc.; Alphabet, Inc., Class C; Microsoft Corp.
TOP PERFORMANCE DETRACTORS
In aggregate | sector allocations
Allocations in the following sectors | health care; financials; cash
Security selection in the following sectors | information technology; industrials
Position weightings | Adobe, Inc.; Alphabet, Inc., Class A; Apple, Inc.
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| Performance Past Does Not Indicate Future [Text] | The Fund ’s past performance is not a good predictor of how the Fund will perform in the future. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] |
Fund Performance
The following graph compares a $10,000 initial investment in the Fund to the index(es) listed below for the last 10 fiscal years of the Fund.
GROWTH OF $10,000
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| Average Annual Return [Table Text Block] |
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| 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. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Jan. 01, 2026 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 458,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 65 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 2,000,000.0 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 62.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] |
Key Fund Statistics
The following table outlines key fund statistics.
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| Holdings [Text Block] |
Graphical Representation of Holdings
The information below represents the composition of the Fund's net assets as of the end of the period.
Top Industries*
Portfolio Composition
* Percentages exclude derivatives (other than purchased options), if any.
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| Material Fund Change [Text Block] |
Material Fund Changes
This is a summary of certain changes to the Fund since the beginning of the period. Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. Additionally, on March 26, 2026, Corebridge Financial, Inc. and Equitable Holdings, Inc. (“EQH”) announced that they have entered into a definitive agreement to merge (the “Transaction”). The Transaction is expected to close by the end of 2026, subject to customary closing conditions, including the receipt of requisite regulatory approvals and approval of the shareholders of both Corebridge Financial, Inc. and EQH. Under the 1940 Act, an investment advisory agreement between a registered investment company, such as VC I, and its investment adviser must include a provision providing for its automatic termination upon its “assignment” (as defined in the 1940 Act). The closing of the Transaction may be deemed to cause an “assignment” of the Investment Advisory Agreement between VC I, on behalf of each Fund, and VALIC. As a result, the closing of the Transaction may cause the Investment Advisory Agreement to terminate automatically in accordance with its terms. It is anticipated that, prior to the closing of the Transaction, VC I’s Board of Directors (the “Board”) will consider a new investment advisory agreement between VC I, on behalf of each Fund, and VALIC. If approved by the Board, the new investment advisory agreement will be presented to the Funds’ shareholders for approval, and, if approved by shareholders, it will take effect upon the closing of the Transaction.
Effective September 29, 2025, the Fund’s investment strategies and techniques were revised to reflect the current investment strategies and techniques used by the Fund’s subadviser. As a result of these changes, ESG Investment Risk was removed as a principal risk. For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542.
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| Material Fund Change Strategies [Text Block] | Effective September 29, 2025, the Fund’s investment strategies and techniques were revised to reflect the current investment strategies and techniques used by the Fund’s subadviser. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Risks Change [Text Block] | As a result of these changes, ESG Investment Risk was removed as a principal risk. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Adviser [Text Block] | Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Accountant Change Disagreements [Text Block] |
Changes in and Disagreements with Accountants
There were no changes in or disagreements with the accountants during the period.
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| C000222578 [Member] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | Conservative Allocation Lifestyle | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Conservative Allocation Lifestyle | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | VGCLX | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the VALIC Company I Conservative Allocation Lifestyle Fund (the “Fund”) for the period of June 1, 2025 to May 31, 2026. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by contacting us at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period.
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| Additional Information Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] | Fund Expenses What were the Fund costs for the last year ? (Based on a hypothetical $10,000 investment)
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| Expenses Paid, Amount | $ 14 | [29] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.13% | [29] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS The Conservative Allocation Lifestyle Fund invests in a combination of affiliated funds, also known as “fund of funds.” The Fund does not select specific sectors, securities, or countries and thus these factors do not influence performance. Rather, the key indicators of performance are asset allocation and manager selection. The Fund posted a return of 13.07% for the year ended May 31, 2026, compared to 29.78% for the S&P 500® Index (a broad-based securities market index) and 12.77% for the Blended Index (the "Performance Index") comprised of 26% Russell 3000® Index; 9% MSCI EAFE Index (net); 65% Bloomberg U.S. Aggregate Bond Index. Over the period, emerging market equities outperformed U.S. equities and international developed equities. Credit markets showed resilience, particularly in high yield segments. The following is a summary of the top contributors and detractors that impacted the Fund's performance during the year relative to the Performance Index. TOP PERFORMANCE CONTRIBUTORS Allocations in the following funds | Core Bond Fund; High Yield Fund TOP PERFORMANCE DETRACTORS Allocations in the following funds | Large Cap Core Fund; Small Cap Growth Fund; Systematic Value Fund
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| Performance Past Does Not Indicate Future [Text] | The Fund ’s past performance is not a good predictor of how the Fund will perform in the future. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] | Fund Performance The following graph compares a $10,000 initial investment in the Fund to the index(es) listed below for the last 10 fiscal years of the Fund. GROWTH OF $10,000 |
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| Average Annual Return [Table Text Block] |
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| 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. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Jan. 01, 2026 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 283,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 12 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 200,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 17.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics The following table outlines key fund statistics.
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| Holdings [Text Block] | Graphical Representation of Holdings The information below represents the composition of the Fund's net assets as of the end of the period. Portfolio Composition |
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| Material Fund Change [Text Block] | Material Fund Changes This is a summary of certain changes to the Fund since the beginning of the period. Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. Additionally, on March 26, 2026, Corebridge Financial, Inc. and Equitable Holdings, Inc. (“EQH”) announced that they have entered into a definitive agreement to merge (the “Transaction”). The Transaction is expected to close by the end of 2026, subject to customary closing conditions, including the receipt of requisite regulatory approvals and approval of the shareholders of both Corebridge Financial, Inc. and EQH. Under the 1940 Act, an investment advisory agreement between a registered investment company, such as VC I, and its investment adviser must include a provision providing for its automatic termination upon its “assignment” (as defined in the 1940 Act). The closing of the Transaction may be deemed to cause an “assignment” of the Investment Advisory Agreement between VC I, on behalf of each Fund, and VALIC. As a result, the closing of the Transaction may cause the Investment Advisory Agreement to terminate automatically in accordance with its terms. It is anticipated that, prior to the closing of the Transaction, VC I’s Board of Directors (the “Board”) will consider a new investment advisory agreement between VC I, on behalf of each Fund, and VALIC. If approved by the Board, the new investment advisory agreement will be presented to the Funds’ shareholders for approval, and, if approved by shareholders, it will take effect upon the closing of the Transaction. Effective September 29, 2025, the Fund changed its name from the “Conservative Growth Lifestyle Fund” to the “Conservative Allocation Lifestyle Fund.” For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542.
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| Material Fund Change Name [Text Block] | Effective September 29, 2025, the Fund changed its name from the “Conservative Growth Lifestyle Fund” to the “Conservative Allocation Lifestyle Fund.” | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Adviser [Text Block] | Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Accountant Change Disagreements [Text Block] | Changes in and Disagreements with Accountants There were no changes in or disagreements with the accountants during the period.
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| C000222579 [Member] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | Core Bond | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Core Bond | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | VCBDX | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the VALIC Company I Core Bond Fund (the “Fund”) for the period of June 1, 2025 to May 31, 2026. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by contacting us at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] |
This report describes changes to the Fund that occurred during the reporting period.
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| Additional Information Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] |
Fund Expenses
What were the Fund costs for the last year ?
(Based on a hypothetical $10,000 investment)
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| Expenses Paid, Amount | $ 49 | [30] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.48% | [30] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] |
Management’s Discussion of Fund Performance
SUMMARY OF RESULTS
The Fund posted a return of 5.58% for the year ending May 31, 2026, compared to a return of 5.13% for the Bloomberg U.S. Aggregate Bond Index (a broad-based securities market & "Performance Index"). Expectations for Fed policy shifts and increased Treasury supply led to a "bear steepening" of the yield curve, where longer-term yields increased more rapidly than short-term yields as investors demanded higher premiums for long-term fiscal risks. Credit spreads experienced temporary widening, peaking in early 2026 amid macroeconomic uncertainty. However, spreads tightened as resilient corporate fundamentals and solid global growth calmed markets.
The following is a summary, by subadviser, of the top contributors and detractors that impacted their portion of the Fund's performance during the year relative to the Performance Index.
TOP PERFORMANCE CONTRIBUTORS
J.P. Morgan Investment Management | Allocations in the following sectors: U.S. Treasuries; agency mortgage-backed securities; non-agency mortgage-backed securities. Security selection in the following sectors: corporate credit; U.S. Treasuries; asset-backed securities
PineBridge Investments, LLC | In aggregate: sector allocations; position weightings. Allocations in the following sectors: Treasuries; agency mortgage-backed securities; industrials. Security selection in the following sectors: industrials; financials; sovereign
TOP PERFORMANCE DETRACTORS
J.P. Morgan Investment Management | Allocations in the following sectors: cash; corporate credit; asset-backed securities. Security selection in the following sectors: agency mortgage-backed securities; U.S. agency
PineBridge Investments, LLC | Allocations in the following sectors: cash; local authority; commercial mortgage-backed securities. Security selection in the following sectors: asset-backed securities
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| Performance Past Does Not Indicate Future [Text] | The Fund ’s past performance is not a good predictor of how the Fund will perform in the future. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] |
Fund Performance
The following graph compares a $10,000 initial investment in the Fund to the index(es) listed below for the last 10 fiscal years of the Fund.
GROWTH OF $10,000
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| Average Annual Return [Table Text Block] |
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| 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. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Jan. 01, 2026 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 2,612,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 1,843 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 10,200,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 30.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] |
Key Fund Statistics
The following table outlines key fund statistics.
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| Holdings [Text Block] |
Graphical Representation of Holdings
The information below represents the composition of the Fund as of the end of the period.
Top Industries*
(% of net assets)
Portfolio Composition
(% of net assets) Credit Quality **
(% of total debt issues) * Percentages exclude derivatives (other than purchased options), if any.
** Credit quality ratings shown above reflect the rating assigned by Moody's Investors Service, Inc. Where Moody's ratings are not available, we have used Standard & Poor's ratings. Unrated investments do not necessarily indicate low credit quality. Credit quality ratings are subject to change. Percentages exclude short-term securities.
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| Credit Quality Explanation [Text Block] | Credit quality ratings shown above reflect the rating assigned by Moody's Investors Service, Inc. Where Moody's ratings are not available, we have used Standard & Poor's ratings. Unrated investments do not necessarily indicate low credit quality. Credit quality ratings are subject to change. Percentages exclude short-term securities. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Credit Ratings Selection [Text Block] | Credit quality ratings shown above reflect the rating assigned by Moody's Investors Service, Inc. Where Moody's ratings are not available, we have used Standard & Poor's ratings. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change [Text Block] |
Material Fund Changes
This is a summary of certain changes to the Fund since the beginning of the period. Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. Additionally, on March 26, 2026, Corebridge Financial, Inc. and Equitable Holdings, Inc. (“EQH”) announced that they have entered into a definitive agreement to merge (the “Transaction”). The Transaction is expected to close by the end of 2026, subject to customary closing conditions, including the receipt of requisite regulatory approvals and approval of the shareholders of both Corebridge Financial, Inc. and EQH. Under the 1940 Act, an investment advisory agreement between a registered investment company, such as VC I, and its investment adviser must include a provision providing for its automatic termination upon its “assignment” (as defined in the 1940 Act). The closing of the Transaction may be deemed to cause an “assignment” of the Investment Advisory Agreement between VC I, on behalf of each Fund, and VALIC. As a result, the closing of the Transaction may cause the Investment Advisory Agreement to terminate automatically in accordance with its terms. It is anticipated that, prior to the closing of the Transaction, VC I’s Board of Directors (the “Board”) will consider a new investment advisory agreement between VC I, on behalf of each Fund, and VALIC. If approved by the Board, the new investment advisory agreement will be presented to the Funds’ shareholders for approval, and, if approved by shareholders, it will take effect upon the closing of the Transaction. For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542.
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| Material Fund Change Adviser [Text Block] | Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Accountant Change Disagreements [Text Block] |
Changes in and Disagreements with Accountants
There were no changes in or disagreements with the accountants during the period.
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| C000222580 [Member] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | High Yield Bond | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | High Yield Bond | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | VHYLX | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the VALIC Company I High Yield Bond Fund (the “Fund”) for the period of June 1, 2025 to May 31, 2026. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by contacting us at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] |
This report describes changes to the Fund that occurred during the reporting period.
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| Additional Information Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] |
Fund Expenses
What were the Fund costs for the last year ?
(Based on a hypothetical $10,000 investment)
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| Expenses Paid, Amount | $ 71 | [31] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.68% | [31] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] |
Management’s Discussion of Fund Performance
SUMMARY OF RESULTS
The Fund posted a return of 8.53% for the year ended May 31, 2026, compared to a return of 5.50% for the Bloomberg U.S. Universal Index (a broad-based securities market index) and 7.44% for the FTSE US High-Yield Market Index (the "Performance Index"). Over the twelve-month period spreads tightened by 57 basis points (bps) to 258 bps. Yields decreased by 43 bps to 7.29% according to the Bloomberg U.S. Corporate High Yield index.
The following is a summary of the top contributors and detractors that impacted the Fund's performance during the year relative to the Performance Index.
TOP PERFORMANCE CONTRIBUTORS
Allocations in the following industries | consumer products; transportation; paper
Security selection in the following industries | technology; financial institutions; retailers
Position weightings | Oracle Corp.; Hudson Pacific Properties LP; Terawulf, Inc.
TOP PERFORMANCE DETRACTORS
Allocations in the following industries | packaging; metal/mining, technology
Security selection in the following industries | building materials; metal/mining; leisure
Position weightings | lack of position in DISH Network Corp.; McAfee Corp.; KKR & Co., Inc.
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| Performance Past Does Not Indicate Future [Text] | The Fund ’s past performance is not a good predictor of how the Fund will perform in the future. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] |
Fund Performance
The following graph compares a $10,000 initial investment in the Fund to the index(es) listed below for the last 10 fiscal years of the Fund.
GROWTH OF $10,000
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| Average Annual Return [Table Text Block] |
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| 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. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Jan. 01, 2026 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 365,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 352 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 2,300,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 56.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] |
Key Fund Statistics
The following table outlines key fund statistics.
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| Holdings [Text Block] |
Graphical Representation of Holdings
The information below represents the composition of the Fund as of the end of the period.
Top Industries*
(% of net assets)
Portfolio Composition
(% of net assets) Credit Quality **
(% of total debt issues) * Percentages exclude derivatives (other than purchased options), if any.
** Credit quality ratings shown above reflect the rating assigned by Moody's Investors Service, Inc. Where Moody's ratings are not available, we have used Standard & Poor's ratings. Unrated investments do not necessarily indicate low credit quality. Credit quality ratings are subject to change. Percentages exclude short-term securities.
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| Credit Quality Explanation [Text Block] | Credit quality ratings shown above reflect the rating assigned by Moody's Investors Service, Inc. Where Moody's ratings are not available, we have used Standard & Poor's ratings. Unrated investments do not necessarily indicate low credit quality. Credit quality ratings are subject to change. Percentages exclude short-term securities. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Credit Ratings Selection [Text Block] | Credit quality ratings shown above reflect the rating assigned by Moody's Investors Service, Inc. Where Moody's ratings are not available, we have used Standard & Poor's ratings. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change [Text Block] |
Material Fund Changes
This is a summary of certain changes to the Fund since the beginning of the period. Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. Additionally, on March 26, 2026, Corebridge Financial, Inc. and Equitable Holdings, Inc. (“EQH”) announced that they have entered into a definitive agreement to merge (the “Transaction”). The Transaction is expected to close by the end of 2026, subject to customary closing conditions, including the receipt of requisite regulatory approvals and approval of the shareholders of both Corebridge Financial, Inc. and EQH. Under the 1940 Act, an investment advisory agreement between a registered investment company, such as VC I, and its investment adviser must include a provision providing for its automatic termination upon its “assignment” (as defined in the 1940 Act). The closing of the Transaction may be deemed to cause an “assignment” of the Investment Advisory Agreement between VC I, on behalf of each Fund, and VALIC. As a result, the closing of the Transaction may cause the Investment Advisory Agreement to terminate automatically in accordance with its terms. It is anticipated that, prior to the closing of the Transaction, VC I’s Board of Directors (the “Board”) will consider a new investment advisory agreement between VC I, on behalf of each Fund, and VALIC. If approved by the Board, the new investment advisory agreement will be presented to the Funds’ shareholders for approval, and, if approved by shareholders, it will take effect upon the closing of the Transaction. For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542.
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| Material Fund Change Adviser [Text Block] | Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Accountant Change Disagreements [Text Block] |
Changes in and Disagreements with Accountants
There were no changes in or disagreements with the accountants during the period.
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| C000222581 [Member] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | International Opportunities | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | International Opportunities | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | VIOPX | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the VALIC Company I International Opportunities Fund (the “Fund”) for the period of June 1, 2025 to May 31, 2026. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by contacting us at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period.
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| Additional Information Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] | Fund Expenses What were the Fund costs for the last year ? (Based on a hypothetical $10,000 investment)
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| Expenses Paid, Amount | $ 115 | [32] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 1.05% | [32] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS The Fund posted a return of 18.79% for the year ended May 31, 2026, compared to a return of 32.77% for the MSCI ACWI ex USA Index (net) (a broad-based securities market) and 29.74% for the MSCI ACWI ex USA SMID Cap Index (net) (the "Performance Index"). Over the period, international stocks outperformed U.S. stocks, largely due to broader market leadership and currency tailwinds. Within international markets, growth stocks underperformed value stocks as performance was driven by strength in cyclical sectors such as financials and industrials sectors. Quality stocks rebounded during the period, though still lagged the broaderequity markets. The following is a summary, by subadviser, of the top contributors and detractors that impacted their portion of the Fund's performance during the year relative to the Performance Index. TOP PERFORMANCE CONTRIBUTORS Invesco Advisers, Inc. | Allocations in the following sectors: information technology; real estate; consumer discretionary. Security selection in the following sectors: consumer staples; real estate. Position weightings: Disco Corp.; Mycronic AB; Sprott, Inc. Exposure to the following countries: India; Brazil; Ireland Wellington Management Company, LLP | In aggregate: position weightings; country allocations. Allocations in the following sectors: consumer staples; health care; communication services. Security selection in the following sectors: information technology; materials; communication services. Position weightings: Chroma ATE, Inc.; Unimicron Technology Corp.; ASPEED Technology, Inc. Exposure to the following countries: India; Taiwan; Japan TOP PERFORMANCE DETRACTORS Invesco Advisers, Inc. | In aggregate: country allocations; position weightings. Allocations in the following sectors: materials; consumer staples; health care. Security selection in the following sectors: information technology; industrials; health care. Position weightings: Carl Zeiss Meditec AG; Partners Group Holding AG; CTS Eventim AG & Co. KGaA. Exposure to the following countries: Japan; Germany; Taiwan Wellington Management Company, LLP | Allocations in the following sectors: real estate; consumer discretionary; cash. Security selection in the following sectors: industrials; consumer staples; consumer discretionary. Position weightings: Fiverr International, Ltd.; SimilarWeb, Ltd.; lack of position in Samsung Electro-Mechanics Co., Ltd. Exposure to the following countries: United Kingdom; lack of exposure to South Korea; Netherlands
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| Performance Past Does Not Indicate Future [Text] | The Fund ’s past performance is not a good predictor of how the Fund will perform in the future. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] | Fund Performance The following graph compares a $10,000 initial investment in the Fund to the index(es) listed below for the last 10 fiscal years of the Fund. GROWTH OF $10,000 |
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| Average Annual Return [Table Text Block] |
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| 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. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Jan. 01, 2026 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 298,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 315 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 2,700,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 105.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics The following table outlines key fund statistics.
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| Holdings [Text Block] | Graphical Representation of Holdings The information below represents the composition of the Fund's net assets as of the end of the period. Top Industries*
Portfolio Composition Country * Percentages exclude derivatives (other than purchased options), if any.
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| Material Fund Change [Text Block] | Material Fund Changes This is a summary of certain changes to the Fund since the beginning of the period. Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. Additionally, on March 26, 2026, Corebridge Financial, Inc. and Equitable Holdings, Inc. (“EQH”) announced that they have entered into a definitive agreement to merge (the “Transaction”). The Transaction is expected to close by the end of 2026, subject to customary closing conditions, including the receipt of requisite regulatory approvals and approval of the shareholders of both Corebridge Financial, Inc. and EQH. Under the 1940 Act, an investment advisory agreement between a registered investment company, such as VC I, and its investment adviser must include a provision providing for its automatic termination upon its “assignment” (as defined in the 1940 Act). The closing of the Transaction may be deemed to cause an “assignment” of the Investment Advisory Agreement between VC I, on behalf of each Fund, and VALIC. As a result, the closing of the Transaction may cause the Investment Advisory Agreement to terminate automatically in accordance with its terms. It is anticipated that, prior to the closing of the Transaction, VC I’s Board of Directors (the “Board”) will consider a new investment advisory agreement between VC I, on behalf of each Fund, and VALIC. If approved by the Board, the new investment advisory agreement will be presented to the Funds’ shareholders for approval, and, if approved by shareholders, it will take effect upon the closing of the Transaction. Effective September 29, 2025, European Investment Risk was added as a principal risk of the Fund. For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542.
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| Material Fund Change Risks Change [Text Block] | Effective September 29, 2025, European Investment Risk was added as a principal risk of the Fund. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Adviser [Text Block] | Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Accountant Change Disagreements [Text Block] | Changes in and Disagreements with Accountants There were no changes in or disagreements with the accountants during the period.
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| C000222582 [Member] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | Mid Cap Value | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Mid Cap Value | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | VVMCX | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the VALIC Company I Mid Cap Value Fund (the “Fund”) for the period of June 1, 2025 to May 31, 2026. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by contacting us at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period.
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| Additional Information Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] | Fund Expenses What were the Fund costs for the last year ? (Based on a hypothetical $10,000 investment)
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| Expenses Paid, Amount | $ 91 | [33] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.83% | [33] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS The Fund posted a return of 20.29% for the year ended May 31, 2026, compared to a return of 29.45% for the Russell 3000® Index (a broad-based securities market index) and 27.21% for the Russell Midcap® Value Index (the "Performance Index"). During the period value indices generally outperformed growth, and small company stocks outpaced larger capitalization names. The technology sector was the largest source of strength in the benchmark. During the period, mid cap value stocks outperformed mid cap growth stocks when measured using the Russell Midcap Value and Growth indices. Mid cap stocks underperformed both small cap and large cap stocks, as measured by the Russell Midcap, Russell 2000, and Russell 1000 indices respectively. The following is a summary, by subadviser, of the top contributors and detractors that impacted their portion of the Fund's performance during the year relative to the Performance Index. TOP PERFORMANCE CONTRIBUTORS Boston Partners Global Investors, Inc. | Allocations in the following sectors: real estate; utilities; communication services. Security selection in the following sectors: real estate; energy; materials. Position weightings: Flex, Ltd.; TechniPFMC PLC; Keysight Technologies, Inc. Wellington Management Company, LLP | In aggregate: sector allocations. Allocations in the following sectors: information technology; consumer staples; utilities. Security selection in the following sectors: consumer discretionary; industrials; financials. Position weightings: MKS, Inc.; Flex, Ltd.; Viavi Solutions, Inc. TOP PERFORMANCE DETRACTORS Boston Partners Global Investors, Inc. | In aggregate: position weightings. Allocations in the following sectors: information technology; consumer discretionary; cash. Security selection in the following sectors: information technology; health care; consumer discretionary. Position weightings: LPL Financial Holdings, Inc.; Check Point Software Technologies, Ltd.; CDW Corp. Wellington Management Company, LLP | In aggregate: position weightings. Allocations in the following sectors: consumer discretionary; financials; materials. Security selection in the following sectors: information technology; health care; materials. Position weightings: Sandisk Corp.; lack of position in Ciena Corp.; Lumentum Holdings, Inc.
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| Performance Past Does Not Indicate Future [Text] | The Fund ’s past performance is not a good predictor of how the Fund will perform in the future. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] | Fund Performance The following graph compares a $10,000 initial investment in the Fund to the index(es) listed below for the last 10 fiscal years of the Fund. GROWTH OF $10,000 |
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| Average Annual Return [Table Text Block] |
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| 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. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Jan. 01, 2026 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 682,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 209 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 4,400,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 112.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics The following table outlines key fund statistics.
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| Holdings [Text Block] | Graphical Representation of Holdings The information below represents the composition of the Fund's net assets as of the end of the period. Top Industries*
Portfolio Composition * Percentages exclude derivatives (other than purchased options), if any.
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| Material Fund Change [Text Block] | Material Fund Changes This is a summary of certain changes to the Fund since the beginning of the period. Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. Additionally, on March 26, 2026, Corebridge Financial, Inc. and Equitable Holdings, Inc. (“EQH”) announced that they have entered into a definitive agreement to merge (the “Transaction”). The Transaction is expected to close by the end of 2026, subject to customary closing conditions, including the receipt of requisite regulatory approvals and approval of the shareholders of both Corebridge Financial, Inc. and EQH. Under the 1940 Act, an investment advisory agreement between a registered investment company, such as VC I, and its investment adviser must include a provision providing for its automatic termination upon its “assignment” (as defined in the 1940 Act). The closing of the Transaction may be deemed to cause an “assignment” of the Investment Advisory Agreement between VC I, on behalf of each Fund, and VALIC. As a result, the closing of the Transaction may cause the Investment Advisory Agreement to terminate automatically in accordance with its terms. It is anticipated that, prior to the closing of the Transaction, VC I’s Board of Directors (the “Board”) will consider a new investment advisory agreement between VC I, on behalf of each Fund, and VALIC. If approved by the Board, the new investment advisory agreement will be presented to the Funds’ shareholders for approval, and, if approved by shareholders, it will take effect upon the closing of the Transaction. For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542.
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| Material Fund Change Adviser [Text Block] | Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Accountant Change Disagreements [Text Block] | Changes in and Disagreements with Accountants There were no changes in or disagreements with the accountants during the period.
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| C000222583 [Member] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | Moderate Allocation Lifestyle | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Moderate Allocation Lifestyle | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | VLSMX | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the VALIC Company I Moderate Allocation Lifestyle Fund (the “Fund”) for the period of June 1, 2025 to May 31, 2026. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by contacting us at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period.
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| Additional Information Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] | Fund Expenses What were the Fund costs for the last year ? (Based on a hypothetical $10,000 investment)
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| Expenses Paid, Amount | $ 11 | [34] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.10% | [34] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS The Moderate Allocation Lifestyle Fund invests in a combination of affiliated funds, also known as “fund of funds.” The Fund does not select specific sectors, securities, or countries and thus these factors do not influence performance. Rather, the key indicators of performance are asset allocation and manager selection. The Fund posted a return of 17.39% for the year ended May 31, 2026, compared to 29.78% for the S&P 500® Index (a broad-based securities market index) and 17.29% for the Blended Index (the "Performance Index") comprised of 41% Russell 3000® Index; 14% MSCI EAFE Index (net); 45% Bloomberg U.S. Aggregate Bond Index. Over the period, emerging market equities outperformed U.S. equities and international developed equities. Credit markets showed resilience, particularly in high yield segments. The following is a summary of the top contributors and detractors that impacted the Fund's performance during the year relative to the Performance Index. TOP PERFORMANCE CONTRIBUTORS Allocations in the following funds | Core Bond Fund; High Yield Fund TOP PERFORMANCE DETRACTORS Allocations in the following funds | Large Cap Core Fund; Small Cap Growth Fund; Systematic Value Fund
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| Performance Past Does Not Indicate Future [Text] | The Fund ’s past performance is not a good predictor of how the Fund will perform in the future. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] | Fund Performance The following graph compares a $10,000 initial investment in the Fund to the index(es) listed below for the last 10 fiscal years of the Fund. GROWTH OF $10,000 |
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| Average Annual Return [Table Text Block] |
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| 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. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Jan. 01, 2026 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 1,042,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 12 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 700,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 21.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics The following table outlines key fund statistics.
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| Holdings [Text Block] | Graphical Representation of Holdings The information below represents the composition of the Fund's net assets as of the end of the period. Portfolio Composition |
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| Material Fund Change [Text Block] | Material Fund Changes This is a summary of certain changes to the Fund since the beginning of the period. Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. Additionally, on March 26, 2026, Corebridge Financial, Inc. and Equitable Holdings, Inc. (“EQH”) announced that they have entered into a definitive agreement to merge (the “Transaction”). The Transaction is expected to close by the end of 2026, subject to customary closing conditions, including the receipt of requisite regulatory approvals and approval of the shareholders of both Corebridge Financial, Inc. and EQH. Under the 1940 Act, an investment advisory agreement between a registered investment company, such as VC I, and its investment adviser must include a provision providing for its automatic termination upon its “assignment” (as defined in the 1940 Act). The closing of the Transaction may be deemed to cause an “assignment” of the Investment Advisory Agreement between VC I, on behalf of each Fund, and VALIC. As a result, the closing of the Transaction may cause the Investment Advisory Agreement to terminate automatically in accordance with its terms. It is anticipated that, prior to the closing of the Transaction, VC I’s Board of Directors (the “Board”) will consider a new investment advisory agreement between VC I, on behalf of each Fund, and VALIC. If approved by the Board, the new investment advisory agreement will be presented to the Funds’ shareholders for approval, and, if approved by shareholders, it will take effect upon the closing of the Transaction. Effective September 29, 2025, the Fund changed its name from the “Moderate Growth Lifestyle Fund” to the “Moderate Allocation Lifestyle Fund." For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542.
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| Material Fund Change Name [Text Block] | Effective September 29, 2025, the Fund changed its name from the “Moderate Growth Lifestyle Fund” to the “Moderate Allocation Lifestyle Fund." | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Adviser [Text Block] | Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Accountant Change Disagreements [Text Block] | Changes in and Disagreements with Accountants There were no changes in or disagreements with the accountants during the period.
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| C000222584 [Member] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | Small Cap Value | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Small Cap Value | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | VVSCX | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the VALIC Company I Small Cap Value Fund (the “Fund”) for the period of June 1, 2025 to May 31, 2026. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by contacting us at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period.
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| Additional Information Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] | Fund Expenses What were the Fund costs for the last year ? (Based on a hypothetical $10,000 investment)
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| Expenses Paid, Amount | $ 103 | [35] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.85% | [35] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS The Fund posted a return of 42.14% for the year ended May 31, 2026, compared to a return of 29.45% for the Russell 3000® Index (a broad-based securities market index) and 44.36% for the Russell 2000® Value Index (the "Performance Index"). Over the period, U.S. large-cap equities underperformed small-cap equities. The following is a summary of the top contributors and detractors that impacted the Fund's performance during the year relative to the Performance Index. TOP PERFORMANCE CONTRIBUTORS Allocations in the following sectors | software & services; basic materials; cash Security selection in the following sectors | basic materials; retail; finance Position weightings | Modine Manufacturing Co.; MYR Group, Inc.; Erasca, Inc. TOP PERFORMANCE DETRACTORS In aggregate | position weightings Allocations in the following sectors | systems hardware; pharmaceuticals; telecommunications Security selection in the following sectors | pharmaceuticals; software & services; energy Position weightings | MaxLinear, Inc.; DNOW, Inc.; ABM Industries, Inc.
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| Performance Past Does Not Indicate Future [Text] | The Fund ’s past performance is not a good predictor of how the Fund will perform in the future. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] | Fund Performance The following graph compares a $10,000 initial investment in the Fund to the index(es) listed below for the last 10 fiscal years of the Fund. GROWTH OF $10,000 |
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| Average Annual Return [Table Text Block] |
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| 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. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Jan. 01, 2026 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 252,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 473 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 1,600,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 80.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics The following table outlines key fund statistics.
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| Holdings [Text Block] | Graphical Representation of Holdings The information below represents the composition of the Fund's net assets as of the end of the period. Top Industries*
Portfolio Composition * Percentages exclude derivatives (other than purchased options), if any.
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| Material Fund Change [Text Block] | Material Fund Changes This is a summary of certain changes to the Fund since the beginning of the period. Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. Additionally, on March 26, 2026, Corebridge Financial, Inc. and Equitable Holdings, Inc. (“EQH”) announced that they have entered into a definitive agreement to merge (the “Transaction”). The Transaction is expected to close by the end of 2026, subject to customary closing conditions, including the receipt of requisite regulatory approvals and approval of the shareholders of both Corebridge Financial, Inc. and EQH. Under the 1940 Act, an investment advisory agreement between a registered investment company, such as VC I, and its investment adviser must include a provision providing for its automatic termination upon its “assignment” (as defined in the 1940 Act). The closing of the Transaction may be deemed to cause an “assignment” of the Investment Advisory Agreement between VC I, on behalf of each Fund, and VALIC. As a result, the closing of the Transaction may cause the Investment Advisory Agreement to terminate automatically in accordance with its terms. It is anticipated that, prior to the closing of the Transaction, VC I’s Board of Directors (the “Board”) will consider a new investment advisory agreement between VC I, on behalf of each Fund, and VALIC. If approved by the Board, the new investment advisory agreement will be presented to the Funds’ shareholders for approval, and, if approved by shareholders, it will take effect upon the closing of the Transaction. For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542.
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| Material Fund Change Adviser [Text Block] | Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Accountant Change Disagreements [Text Block] | Changes in and Disagreements with Accountants There were no changes in or disagreements with the accountants during the period.
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| C000224903 [Member] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | Small Cap Growth | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Small Cap Growth | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | VVSGX | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the VALIC Company I Small Cap Growth Fund (the “Fund”) for the period of June 1, 2025 to May 31, 2026. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by contacting us at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] |
This report describes changes to the Fund that occurred during the reporting period.
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| Additional Information Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] |
Fund Expenses
What were the Fund costs for the last year ?
(Based on a hypothetical $10,000 investment)
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| Expenses Paid, Amount | $ 99 | [36] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.88% | [36] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] |
Management’s Discussion of Fund Performance
SUMMARY OF RESULTS
The Fund posted a return of 25.99% for the year ended May 31, 2026, compared to a return of 29.45% for the Russell 3000® Index (a broad-based securities market index) and 41.87% for the Russell 2000® Growth Index (the "Performance Index"). Over the period, U.S. small-cap equities outperformed large-cap equities. Value stocks outperformed growth in the small-cap space.
The following is a summary of the top contributors and detractors that impacted the Fund's performance during the year relative to the Performance Index.
TOP PERFORMANCE CONTRIBUTORS
Allocations in the following sectors | financials; industrials; communication services
Security selection in the following sectors | utilities; consumer staples; communication services
Position weightings | Sterling Infrastructure, Inc.; MACOM Technology Solutions Holdings, Inc.; MKS, Inc.
TOP PERFORMANCE DETRACTORS
In aggregate | position weightings
Allocations in the following sectors | utilities; cash; energy
Security selection in the following sectors | industrials; financials; consumer discretionary
Position weightings | lack of position in Bloom Energy Corp., Class A; Klaviyo, Inc., Class A; Q2 Holdings, Inc.
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| Performance Past Does Not Indicate Future [Text] | The Fund ’s past performance is not a good predictor of how the Fund will perform in the future. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] |
Fund Performance
The following graph compares a $10,000 initial investment in the Fund to the index(es) listed below for the last 10 fiscal years of the Fund.
GROWTH OF $10,000
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| Average Annual Return [Table Text Block] |
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| 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. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Jan. 01, 2026 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 540,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 153 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 3,900,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 99.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] |
Key Fund Statistics
The following table outlines key fund statistics.
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| Holdings [Text Block] |
Graphical Representation of Holdings
The information below represents the composition of the Fund's net assets as of the end of the period.
Top Industries*
Portfolio Composition
* Percentages exclude derivatives (other than purchased options), if any.
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| Material Fund Change [Text Block] |
Material Fund Changes
This is a summary of certain changes to the Fund since the beginning of the period. Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. Additionally, on March 26, 2026, Corebridge Financial, Inc. and Equitable Holdings, Inc. (“EQH”) announced that they have entered into a definitive agreement to merge (the “Transaction”). The Transaction is expected to close by the end of 2026, subject to customary closing conditions, including the receipt of requisite regulatory approvals and approval of the shareholders of both Corebridge Financial, Inc. and EQH. Under the 1940 Act, an investment advisory agreement between a registered investment company, such as VC I, and its investment adviser must include a provision providing for its automatic termination upon its “assignment” (as defined in the 1940 Act). The closing of the Transaction may be deemed to cause an “assignment” of the Investment Advisory Agreement between VC I, on behalf of each Fund, and VALIC. As a result, the closing of the Transaction may cause the Investment Advisory Agreement to terminate automatically in accordance with its terms. It is anticipated that, prior to the closing of the Transaction, VC I’s Board of Directors (the “Board”) will consider a new investment advisory agreement between VC I, on behalf of each Fund, and VALIC. If approved by the Board, the new investment advisory agreement will be presented to the Funds’ shareholders for approval, and, if approved by shareholders, it will take effect upon the closing of the Transaction. For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542.
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| Material Fund Change Adviser [Text Block] | Effective January 1, 2026, The Variable Annuity Life Insurance Company (“VALIC”), the investment adviser to the Fund, replaced SunAmerica Asset Management, LLC (“SunAmerica”) as the administrator of VALIC Company I (“VC I”) and SunAmerica became VC I’s sub-administrator. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | For more comprehensive information, you may review the Fund’s next prospectus, which we expect to be available by September 30, 2026 at corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also request this information by calling Corebridge Financial, Inc. at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Accountant Change Disagreements [Text Block] |
Changes in and Disagreements with Accountants
There were no changes in or disagreements with the accountants during the period.
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