Shareholder Report |
6 Months Ended | |||||||||||||||||||||||||||||||||||||||||
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Jun. 30, 2026
USD ($)
Holding
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| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||||||
| Document Type | N-CSRS | |||||||||||||||||||||||||||||||||||||||||
| Amendment Flag | false | |||||||||||||||||||||||||||||||||||||||||
| Registrant Name | SUNAMERICA SERIES TRUST | |||||||||||||||||||||||||||||||||||||||||
| Entity Central Index Key | 0000892538 | |||||||||||||||||||||||||||||||||||||||||
| Entity Investment Company Type | N-1A | |||||||||||||||||||||||||||||||||||||||||
| Document Period End Date | Jun. 30, 2026 | |||||||||||||||||||||||||||||||||||||||||
| C000035587 [Member] | ||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||||||
| Fund Name | SA American Funds Growth | |||||||||||||||||||||||||||||||||||||||||
| Class Name | Class 3 | |||||||||||||||||||||||||||||||||||||||||
| No Trading Symbol Flag | true | |||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the SunAmerica Series Trust SA American Funds Growth Portfolio (the “Portfolio”) for the period of January 1, 2026 to June 30, 2026. | |||||||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Portfolio at venerable.onlineprospectus.net/funds/sast_sst/. As shares of the Portfolio are issued and redeemed in connection with investments in and payments under variable annuity contracts and/or variable life policies (collectively, the “Variable Contracts”) offered by third-party life insurance companies affiliated with Corebridge Financial, Inc. (“Corebridge”), you can also request this information by calling Corebridge at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||
| Additional Information Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | venerable.onlineprospectus.net/funds/sast_sst/ | |||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] | Fund Expenses What were the Portfolio costs for the last six months ? (Based on a hypothetical $10,000 investment)
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|||||||||||||||||||||||||||||||||||||||||
| Expenses Paid, Amount | $ 27 | [1] | ||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.52% | [1],[2] | ||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 1,341,000,000 | |||||||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 1 | |||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 1,600,000 | |||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 3.00% | |||||||||||||||||||||||||||||||||||||||||
| 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 Portfolio's net assets as of the end of the period. Portfolio Composition |
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| 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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| C000169127 [Member] | ||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||||||
| Fund Name | SA American Funds Growth | |||||||||||||||||||||||||||||||||||||||||
| Class Name | Class 1 | |||||||||||||||||||||||||||||||||||||||||
| No Trading Symbol Flag | true | |||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the SunAmerica Series Trust SA American Funds Growth Portfolio (the “Portfolio”) for the period of January 1, 2026 to June 30, 2026. | |||||||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Portfolio at venerable.onlineprospectus.net/funds/sast_sst/. As shares of the Portfolio are issued and redeemed in connection with investments in and payments under variable annuity contracts and/or variable life policies (collectively, the “Variable Contracts”) offered by third-party life insurance companies affiliated with Corebridge Financial, Inc. (“Corebridge”), you can also request this information by calling Corebridge at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||
| Additional Information Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | venerable.onlineprospectus.net/funds/sast_sst/ | |||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] | Fund Expenses What were the Portfolio costs for the last six months ? (Based on a hypothetical $10,000 investment)
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| Expenses Paid, Amount | $ 14 | [3] | ||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.27% | [3],[4] | ||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 1,341,000,000 | |||||||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 1 | |||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 1,600,000 | |||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 3.00% | |||||||||||||||||||||||||||||||||||||||||
| 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 Portfolio's net assets as of the end of the period. Portfolio Composition |
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| 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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| C000169128 [Member] | ||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||||||
| Fund Name | SA American Funds Global Growth | |||||||||||||||||||||||||||||||||||||||||
| Class Name | Class 1 | |||||||||||||||||||||||||||||||||||||||||
| No Trading Symbol Flag | true | |||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the SunAmerica Series Trust SA American Funds Global Growth Portfolio (the “Portfolio”) for the period of January 1, 2026 to June 30, 2026. | |||||||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Portfolio at venerable.onlineprospectus.net/funds/sast_sst/. As shares of the Portfolio are issued and redeemed in connection with investments in and payments under variable annuity contracts and/or variable life policies (collectively, the “Variable Contracts”) offered by third-party life insurance companies affiliated with Corebridge Financial, Inc. (“Corebridge”), you can also request this information by calling Corebridge at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||
| Additional Information Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | venerable.onlineprospectus.net/funds/sast_sst/ | |||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] | Fund Expenses What were the Portfolio costs for the last six months ? (Based on a hypothetical $10,000 investment)
|
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| Expenses Paid, Amount | $ 16 | [5] | ||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.29% | [5],[6] | ||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 418,000,000 | |||||||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 1 | |||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 500,000 | |||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 2.00% | |||||||||||||||||||||||||||||||||||||||||
| 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 Portfolio's net assets as of the end of the period. Portfolio Composition |
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| 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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| C000035588 [Member] | ||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||||||
| Fund Name | SA American Funds Global Growth | |||||||||||||||||||||||||||||||||||||||||
| Class Name | Class 3 | |||||||||||||||||||||||||||||||||||||||||
| No Trading Symbol Flag | true | |||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the SunAmerica Series Trust SA American Funds Global Growth Portfolio (the “Portfolio”) for the period of January 1, 2026 to June 30, 2026. | |||||||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Portfolio at venerable.onlineprospectus.net/funds/sast_sst/. As shares of the Portfolio are issued and redeemed in connection with investments in and payments under variable annuity contracts and/or variable life policies (collectively, the “Variable Contracts”) offered by third-party life insurance companies affiliated with Corebridge Financial, Inc. (“Corebridge”), you can also request this information by calling Corebridge at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||
| Additional Information Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | venerable.onlineprospectus.net/funds/sast_sst/ | |||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] | Fund Expenses What were the Portfolio costs for the last six months ? (Based on a hypothetical $10,000 investment)
|
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| Expenses Paid, Amount | $ 30 | [7] | ||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.54% | [7],[8] | ||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 418,000,000 | |||||||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 1 | |||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 500,000 | |||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 2.00% | |||||||||||||||||||||||||||||||||||||||||
| 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 Portfolio's net assets as of the end of the period. Portfolio Composition |
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| 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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| C000035589 [Member] | ||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||||||
| Fund Name | SA American Funds Growth-Income | |||||||||||||||||||||||||||||||||||||||||
| Class Name | Class 3 | |||||||||||||||||||||||||||||||||||||||||
| No Trading Symbol Flag | true | |||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the SunAmerica Series Trust SA American Funds Growth-Income Portfolio (the “Portfolio”) for the period of January 1, 2026 to June 30, 2026. | |||||||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Portfolio at venerable.onlineprospectus.net/funds/sast_sst/. As shares of the Portfolio are issued and redeemed in connection with investments in and payments under variable annuity contracts and/or variable life policies (collectively, the “Variable Contracts”) offered by third-party life insurance companies affiliated with Corebridge Financial, Inc. (“Corebridge”), you can also request this information by calling Corebridge at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||
| Additional Information Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | venerable.onlineprospectus.net/funds/sast_sst/ | |||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] | Fund Expenses What were the Portfolio costs for the last six months ? (Based on a hypothetical $10,000 investment)
|
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| Expenses Paid, Amount | $ 28 | [9] | ||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.53% | [9],[10] | ||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 594,000,000 | |||||||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 1 | |||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 700,000 | |||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 3.00% | |||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics The following table outlines key fund statistics.
|
|||||||||||||||||||||||||||||||||||||||||
| Holdings [Text Block] | Graphical Representation of Holdings The information below represents the composition of the Portfolio's net assets as of the end of the period. Portfolio Composition |
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| 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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| C000169129 [Member] | ||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||||||
| Fund Name | SA American Funds Growth-Income | |||||||||||||||||||||||||||||||||||||||||
| Class Name | Class 1 | |||||||||||||||||||||||||||||||||||||||||
| No Trading Symbol Flag | true | |||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the SunAmerica Series Trust SA American Funds Growth-Income Portfolio (the “Portfolio”) for the period of January 1, 2026 to June 30, 2026. | |||||||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Portfolio at venerable.onlineprospectus.net/funds/sast_sst/. As shares of the Portfolio are issued and redeemed in connection with investments in and payments under variable annuity contracts and/or variable life policies (collectively, the “Variable Contracts”) offered by third-party life insurance companies affiliated with Corebridge Financial, Inc. (“Corebridge”), you can also request this information by calling Corebridge at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||
| Additional Information Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | venerable.onlineprospectus.net/funds/sast_sst/ | |||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] | Fund Expenses What were the Portfolio costs for the last six months ? (Based on a hypothetical $10,000 investment)
|
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| Expenses Paid, Amount | $ 15 | [11] | ||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.28% | [11],[12] | ||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 594,000,000 | |||||||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 1 | |||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 700,000 | |||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 3.00% | |||||||||||||||||||||||||||||||||||||||||
| 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 Portfolio's net assets as of the end of the period. Portfolio Composition |
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| 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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| C000169130 [Member] | ||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||||||
| Fund Name | SA American Funds Asset Allocation | |||||||||||||||||||||||||||||||||||||||||
| Class Name | Class 1 | |||||||||||||||||||||||||||||||||||||||||
| No Trading Symbol Flag | true | |||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the SunAmerica Series Trust SA American Funds Asset Allocation Portfolio (the “Portfolio”) for the period of January 1, 2026 to June 30, 2026. | |||||||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Portfolio at venerable.onlineprospectus.net/funds/sast_sst/. As shares of the Portfolio are issued and redeemed in connection with investments in and payments under variable annuity contracts and/or variable life policies (collectively, the “Variable Contracts”) offered by third-party life insurance companies affiliated with Corebridge Financial, Inc. (“Corebridge”), you can also request this information by calling Corebridge at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||
| Additional Information Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | venerable.onlineprospectus.net/funds/sast_sst/ | |||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] | Fund Expenses What were the Portfolio costs for the last six months ? (Based on a hypothetical $10,000 investment)
|
|||||||||||||||||||||||||||||||||||||||||
| Expenses Paid, Amount | $ 13 | [13] | ||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.26% | [13],[14] | ||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 1,882,000,000 | |||||||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 1 | |||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 2,300,000 | |||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 0.00% | |||||||||||||||||||||||||||||||||||||||||
| 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 Portfolio's net assets as of the end of the period. Portfolio Composition |
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| 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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| C000035590 [Member] | ||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||||||
| Fund Name | SA American Funds Asset Allocation | |||||||||||||||||||||||||||||||||||||||||
| Class Name | Class 3 | |||||||||||||||||||||||||||||||||||||||||
| No Trading Symbol Flag | true | |||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the SunAmerica Series Trust SA American Funds Asset Allocation Portfolio (the “Portfolio”) for the period of January 1, 2026 to June 30, 2026. | |||||||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Portfolio at venerable.onlineprospectus.net/funds/sast_sst/. As shares of the Portfolio are issued and redeemed in connection with investments in and payments under variable annuity contracts and/or variable life policies (collectively, the “Variable Contracts”) offered by third-party life insurance companies affiliated with Corebridge Financial, Inc. (“Corebridge”), you can also request this information by calling Corebridge at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||
| Additional Information Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | venerable.onlineprospectus.net/funds/sast_sst/ | |||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] | Fund Expenses What were the Portfolio costs for the last six months ? (Based on a hypothetical $10,000 investment)
|
|||||||||||||||||||||||||||||||||||||||||
| Expenses Paid, Amount | $ 26 | [15] | ||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.51% | [15],[16] | ||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 1,882,000,000 | |||||||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 1 | |||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 2,300,000 | |||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 0.00% | |||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics The following table outlines key fund statistics.
|
|||||||||||||||||||||||||||||||||||||||||
| Holdings [Text Block] | Graphical Representation of Holdings The information below represents the composition of the Portfolio's net assets as of the end of the period. Portfolio Composition |
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| 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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| C000118754 [Member] | ||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||||||
| Fund Name | SA American Funds VCP Managed Allocation | |||||||||||||||||||||||||||||||||||||||||
| Class Name | Class 3 | |||||||||||||||||||||||||||||||||||||||||
| No Trading Symbol Flag | true | |||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the SunAmerica Series Trust SA American Funds VCP Managed Allocation Portfolio (the “Portfolio”) for the period of January 1, 2026 to June 30, 2026. | |||||||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Portfolio at venerable.onlineprospectus.net/funds/sast_sst/. As shares of the Portfolio are issued and redeemed in connection with investments in and payments under variable annuity contracts and/or variable life policies (collectively, the “Variable Contracts”) offered by third-party life insurance companies affiliated with Corebridge Financial, Inc. (“Corebridge”), you can also request this information by calling Corebridge at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||
| Additional Information Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | venerable.onlineprospectus.net/funds/sast_sst/ | |||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] | Fund Expenses What were the Portfolio costs for the last six months ? (Based on a hypothetical $10,000 investment)
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| Expenses Paid, Amount | $ 27 | [17] | ||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.52% | [17],[18] | ||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 1,791,000,000 | |||||||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 1 | |||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 2,200,000 | |||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 1.00% | |||||||||||||||||||||||||||||||||||||||||
| 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 Portfolio's net assets as of the end of the period. Portfolio Composition |
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| 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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| C000169133 [Member] | ||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||||||
| Fund Name | SA American Funds VCP Managed Allocation | |||||||||||||||||||||||||||||||||||||||||
| Class Name | Class 1 | |||||||||||||||||||||||||||||||||||||||||
| No Trading Symbol Flag | true | |||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the SunAmerica Series Trust SA American Funds VCP Managed Allocation Portfolio (the “Portfolio”) for the period of January 1, 2026 to June 30, 2026. | |||||||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Portfolio at venerable.onlineprospectus.net/funds/sast_sst/. As shares of the Portfolio are issued and redeemed in connection with investments in and payments under variable annuity contracts and/or variable life policies (collectively, the “Variable Contracts”) offered by third-party life insurance companies affiliated with Corebridge Financial, Inc. (“Corebridge”), you can also request this information by calling Corebridge at 1-800-448-2542. | |||||||||||||||||||||||||||||||||||||||||
| Additional Information Phone Number | 1-800-448-2542 | |||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | venerable.onlineprospectus.net/funds/sast_sst/ | |||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] |
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
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| Expenses Paid, Amount | $ 14 | [19] | ||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.27% | [19],[20] | ||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 1,791,000,000 | |||||||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 1 | |||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 2,200,000 | |||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 1.00% | |||||||||||||||||||||||||||||||||||||||||
| 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 Portfolio's net assets as of the end of the period.
Portfolio Composition
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| 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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