v3.25.2
Shareholder Report
6 Months Ended
Jul. 31, 2025
USD ($)
Holding
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 Jul. 31, 2025
C000022023 [Member]  
Shareholder Report [Line Items]  
Fund Name SA JPMorgan Emerging Markets
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 JPMorgan Emerging Markets Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA JPMorgan Emerging Markets Portfolio (Class 3)* $78 1.45%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 78 [1]
Expense Ratio, Percent 1.45% [1],[2]
Net Assets $ 198,000,000
Holdings Count | Holding 150
Advisory Fees Paid, Amount $ 900,000
Investment Company Portfolio Turnover 41.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $198M
Total number of portfolio holdings 150
Total net advisory fee paid $0.9M
Portfolio turnover rate during the reporting period 41%
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.
Top Industries*
Banks 20.2%
Semiconductors 19.0%
Internet 11.8%
Insurance 5.2%
Computers 3.0%
Telecommunications 2.9%
Software 2.8%
Diversified Financial Services 2.6%
Auto Manufacturers 2.5%
Airlines 1.9%
Food 1.8%
Retail 1.8%
Oil & Gas 1.7%
Electric 1.7%
Auto Parts & Equipment 1.6%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
Country
Graphical Representation - Allocation 2 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000022021 [Member]  
Shareholder Report [Line Items]  
Fund Name SA JPMorgan Emerging Markets
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 JPMorgan Emerging Markets Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA JPMorgan Emerging Markets Portfolio (Class 1)* $64 1.20%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 64 [3]
Expense Ratio, Percent 1.20% [3],[4]
Net Assets $ 198,000,000
Holdings Count | Holding 150
Advisory Fees Paid, Amount $ 900,000
Investment Company Portfolio Turnover 41.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $198M
Total number of portfolio holdings 150
Total net advisory fee paid $0.9M
Portfolio turnover rate during the reporting period 41%
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.
Top Industries*
Banks 20.2%
Semiconductors 19.0%
Internet 11.8%
Insurance 5.2%
Computers 3.0%
Telecommunications 2.9%
Software 2.8%
Diversified Financial Services 2.6%
Auto Manufacturers 2.5%
Airlines 1.9%
Food 1.8%
Retail 1.8%
Oil & Gas 1.7%
Electric 1.7%
Auto Parts & Equipment 1.6%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
Country
Graphical Representation - Allocation 2 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000022022 [Member]  
Shareholder Report [Line Items]  
Fund Name SA JPMorgan Emerging Markets
Class Name Class 2
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 JPMorgan Emerging Markets Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA JPMorgan Emerging Markets Portfolio (Class 2)* $72 1.35%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 72 [5]
Expense Ratio, Percent 1.35% [5],[6]
Net Assets $ 198,000,000
Holdings Count | Holding 150
Advisory Fees Paid, Amount $ 900,000
Investment Company Portfolio Turnover 41.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $198M
Total number of portfolio holdings 150
Total net advisory fee paid $0.9M
Portfolio turnover rate during the reporting period 41%
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.
Top Industries*
Banks 20.2%
Semiconductors 19.0%
Internet 11.8%
Insurance 5.2%
Computers 3.0%
Telecommunications 2.9%
Software 2.8%
Diversified Financial Services 2.6%
Auto Manufacturers 2.5%
Airlines 1.9%
Food 1.8%
Retail 1.8%
Oil & Gas 1.7%
Electric 1.7%
Auto Parts & Equipment 1.6%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
Country
Graphical Representation - Allocation 2 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000022018 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Morgan Stanley International Equities
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 Morgan Stanley International Equities Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Morgan Stanley International Equities Portfolio (Class 1)* $45 0.87%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 45 [7]
Expense Ratio, Percent 0.87% [7],[8]
Net Assets $ 344,000,000
Holdings Count | Holding 58
Advisory Fees Paid, Amount $ 1,300,000
Investment Company Portfolio Turnover 30.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $344M
Total number of portfolio holdings 58
Total net advisory fee paid $1.3M
Portfolio turnover rate during the reporting period 30%
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.
Top Industries*
Machinery-Diversified 10.0%
Semiconductors 9.4%
Software 7.2%
Cosmetics/Personal Care 6.5%
Banks 5.9%
Pharmaceuticals 5.0%
Insurance 4.7%
Electronics 4.2%
Computers 3.7%
Retail 3.2%
Diversified Financial Services 3.1%
Commercial Services 3.0%
Aerospace/Defense 2.8%
Internet 2.8%
Beverages 2.7%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
Country
Graphical Representation - Allocation 2 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000022019 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Morgan Stanley International Equities
Class Name Class 2
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 Morgan Stanley International Equities Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Morgan Stanley International Equities Portfolio (Class 2)* $53 1.02%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 53 [9]
Expense Ratio, Percent 1.02% [9],[10]
Net Assets $ 344,000,000
Holdings Count | Holding 58
Advisory Fees Paid, Amount $ 1,300,000
Investment Company Portfolio Turnover 30.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $344M
Total number of portfolio holdings 58
Total net advisory fee paid $1.3M
Portfolio turnover rate during the reporting period 30%
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.
Top Industries*
Machinery-Diversified 10.0%
Semiconductors 9.4%
Software 7.2%
Cosmetics/Personal Care 6.5%
Banks 5.9%
Pharmaceuticals 5.0%
Insurance 4.7%
Electronics 4.2%
Computers 3.7%
Retail 3.2%
Diversified Financial Services 3.1%
Commercial Services 3.0%
Aerospace/Defense 2.8%
Internet 2.8%
Beverages 2.7%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
Country
Graphical Representation - Allocation 2 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000022020 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Morgan Stanley International Equities
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 Morgan Stanley International Equities Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Morgan Stanley International Equities Portfolio (Class 3)* $58 1.12%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 58 [11]
Expense Ratio, Percent 1.12% [11],[12]
Net Assets $ 344,000,000
Holdings Count | Holding 58
Advisory Fees Paid, Amount $ 1,300,000
Investment Company Portfolio Turnover 30.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $344M
Total number of portfolio holdings 58
Total net advisory fee paid $1.3M
Portfolio turnover rate during the reporting period 30%
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.
Top Industries*
Machinery-Diversified 10.0%
Semiconductors 9.4%
Software 7.2%
Cosmetics/Personal Care 6.5%
Banks 5.9%
Pharmaceuticals 5.0%
Insurance 4.7%
Electronics 4.2%
Computers 3.7%
Retail 3.2%
Diversified Financial Services 3.1%
Commercial Services 3.0%
Aerospace/Defense 2.8%
Internet 2.8%
Beverages 2.7%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
Country
Graphical Representation - Allocation 2 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000022028 [Member]  
Shareholder Report [Line Items]  
Fund Name SA PineBridge High-Yield Bond
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 PineBridge High-Yield Bond Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA PineBridge High-Yield Bond Portfolio (Class 3)* $49 0.98%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 49 [13]
Expense Ratio, Percent 0.98% [13],[14]
Net Assets $ 263,000,000
Holdings Count | Holding 269
Advisory Fees Paid, Amount $ 800,000
Investment Company Portfolio Turnover 23.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $263M
Total number of portfolio holdings 269
Total net advisory fee paid $0.8M
Portfolio turnover rate during the reporting period 23%
Holdings [Text Block]
Graphical Representation of Holdings
The information below represents the composition of the Portfolio as of the end of the period.
Top Industries*
(% of net assets)
Diversified Financial Services 7.1%
Commercial Services 6.8%
Telecommunications 6.4%
Pipelines 6.4%
Oil & Gas 6.2%
Media 6.0%
Retail 4.5%
Electric 4.3%
REITS 3.4%
Leisure Time 2.9%
Insurance 2.8%
Entertainment 2.8%
Iron/Steel 2.8%
Pharmaceuticals 2.7%
Packaging & Containers 2.6%
Portfolio Composition
(% of net assets)
Graphical Representation - Allocation 1 Chart
Credit Quality **
(% of total debt issues)
Graphical Representation - Allocation 2 Chart
*   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.
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.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000022027 [Member]  
Shareholder Report [Line Items]  
Fund Name SA PineBridge High-Yield Bond
Class Name Class 2
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 PineBridge High-Yield Bond Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA PineBridge High-Yield Bond Portfolio (Class 2)* $44 0.88%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 44 [15]
Expense Ratio, Percent 0.88% [15],[16]
Net Assets $ 263,000,000
Holdings Count | Holding 269
Advisory Fees Paid, Amount $ 800,000
Investment Company Portfolio Turnover 23.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $263M
Total number of portfolio holdings 269
Total net advisory fee paid $0.8M
Portfolio turnover rate during the reporting period 23%
Holdings [Text Block]
Graphical Representation of Holdings
The information below represents the composition of the Portfolio as of the end of the period.
Top Industries*
(% of net assets)
Diversified Financial Services 7.1%
Commercial Services 6.8%
Telecommunications 6.4%
Pipelines 6.4%
Oil & Gas 6.2%
Media 6.0%
Retail 4.5%
Electric 4.3%
REITS 3.4%
Leisure Time 2.9%
Insurance 2.8%
Entertainment 2.8%
Iron/Steel 2.8%
Pharmaceuticals 2.7%
Packaging & Containers 2.6%
Portfolio Composition
(% of net assets)
Graphical Representation - Allocation 1 Chart
Credit Quality **
(% of total debt issues)
Graphical Representation - Allocation 2 Chart
*   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.
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.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000022026 [Member]  
Shareholder Report [Line Items]  
Fund Name SA PineBridge High-Yield Bond
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 PineBridge High-Yield Bond Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA PineBridge High-Yield Bond Portfolio (Class 1)* $37 0.73%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 37 [17]
Expense Ratio, Percent 0.73% [17],[18]
Net Assets $ 263,000,000
Holdings Count | Holding 269
Advisory Fees Paid, Amount $ 800,000
Investment Company Portfolio Turnover 23.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $263M
Total number of portfolio holdings 269
Total net advisory fee paid $0.8M
Portfolio turnover rate during the reporting period 23%
Holdings [Text Block]
Graphical Representation of Holdings
The information below represents the composition of the Portfolio as of the end of the period.
Top Industries*
(% of net assets)
Diversified Financial Services 7.1%
Commercial Services 6.8%
Telecommunications 6.4%
Pipelines 6.4%
Oil & Gas 6.2%
Media 6.0%
Retail 4.5%
Electric 4.3%
REITS 3.4%
Leisure Time 2.9%
Insurance 2.8%
Entertainment 2.8%
Iron/Steel 2.8%
Pharmaceuticals 2.7%
Packaging & Containers 2.6%
Portfolio Composition
(% of net assets)
Graphical Representation - Allocation 1 Chart
Credit Quality **
(% of total debt issues)
Graphical Representation - Allocation 2 Chart
*   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.
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.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000199994 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Emerging Markets Equity Index
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 Emerging Markets Equity Index Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Emerging Markets Equity Index Portfolio (Class 3)* $44 0.83%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 44 [19]
Expense Ratio, Percent 0.83% [19],[20]
Net Assets $ 104,000,000
Holdings Count | Holding 1,005
Advisory Fees Paid, Amount $ 200,000
Investment Company Portfolio Turnover 12.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $104M
Total number of portfolio holdings 1,005
Total net advisory fee paid $0.2M
Portfolio turnover rate during the reporting period 12%
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.
Top Industries*
Semiconductors 16.9%
Banks 16.7%
Internet 13.5%
Diversified Financial Services 4.6%
Telecommunications 4.3%
Oil & Gas 4.0%
Auto Manufacturers 3.0%
Insurance 2.7%
Computers 2.6%
Mining 2.2%
Electronics 2.2%
Retail 1.9%
Pharmaceuticals 1.9%
Electric 1.7%
Real Estate 1.6%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
Country
Graphical Representation - Allocation 2 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000199993 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Emerging Markets Equity Index
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 Emerging Markets Equity Index Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Emerging Markets Equity Index Portfolio (Class 1)* $31 0.58%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 31 [21]
Expense Ratio, Percent 0.58% [21],[22]
Net Assets $ 104,000,000
Holdings Count | Holding 1,005
Advisory Fees Paid, Amount $ 200,000
Investment Company Portfolio Turnover 12.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $104M
Total number of portfolio holdings 1,005
Total net advisory fee paid $0.2M
Portfolio turnover rate during the reporting period 12%
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.
Top Industries*
Semiconductors 16.9%
Banks 16.7%
Internet 13.5%
Diversified Financial Services 4.6%
Telecommunications 4.3%
Oil & Gas 4.0%
Auto Manufacturers 3.0%
Insurance 2.7%
Computers 2.6%
Mining 2.2%
Electronics 2.2%
Retail 1.9%
Pharmaceuticals 1.9%
Electric 1.7%
Real Estate 1.6%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
Country
Graphical Representation - Allocation 2 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000193967 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Goldman Sachs Multi-Asset Insights
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 Goldman Sachs Multi-Asset Insights Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Goldman Sachs Multi-Asset Insights Portfolio (Class 1)* $42 0.83%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 42 [23]
Expense Ratio, Percent 0.83% [23],[24]
Net Assets $ 50,000,000
Holdings Count | Holding 291
Advisory Fees Paid, Amount $ 200,000
Investment Company Portfolio Turnover 79.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $50M
Total number of portfolio holdings 291
Total net advisory fee paid $0.2M
Portfolio turnover rate during the reporting period 79%
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.
Top Industries*
Short-Term Investments 25.7%
Internet 7.4%
Semiconductors 6.1%
Banks 6.0%
Software 4.7%
Diversified Financial Services 4.0%
Insurance 3.3%
Aerospace/Defense 3.1%
Computers 3.0%
Pharmaceuticals 2.7%
Unaffiliated Investment Companies 2.3%
REITS 2.2%
Telecommunications 2.0%
Commercial Services 1.6%
Electronics 1.6%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000193968 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Goldman Sachs Multi-Asset Insights
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 Goldman Sachs Multi-Asset Insights Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Goldman Sachs Multi-Asset Insights Portfolio (Class 3)* $55 1.08%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 55 [25]
Expense Ratio, Percent 1.08% [25],[26]
Net Assets $ 50,000,000
Holdings Count | Holding 291
Advisory Fees Paid, Amount $ 200,000
Investment Company Portfolio Turnover 79.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $50M
Total number of portfolio holdings 291
Total net advisory fee paid $0.2M
Portfolio turnover rate during the reporting period 79%
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.
Top Industries*
Short-Term Investments 25.7%
Internet 7.4%
Semiconductors 6.1%
Banks 6.0%
Software 4.7%
Diversified Financial Services 4.0%
Insurance 3.3%
Aerospace/Defense 3.1%
Computers 3.0%
Pharmaceuticals 2.7%
Unaffiliated Investment Companies 2.3%
REITS 2.2%
Telecommunications 2.0%
Commercial Services 1.6%
Electronics 1.6%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000193973 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Fixed Income Intermediate Index
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 Fixed Income Intermediate Index Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Fixed Income Intermediate Index Portfolio (Class 1)* $17 0.33%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 17 [27]
Expense Ratio, Percent 0.33% [27],[28]
Net Assets $ 494,000,000
Holdings Count | Holding 1,009
Advisory Fees Paid, Amount $ 700,000
Investment Company Portfolio Turnover 70.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $494M
Total number of portfolio holdings 1,009
Total net advisory fee paid $0.7M
Portfolio turnover rate during the reporting period 70%
Holdings [Text Block]
Graphical Representation of Holdings
The information below represents the composition of the Portfolio as of the end of the period.
Top Industries*
(% of net assets)
U.S. Government & Agency Obligations 54.1%
Banks 9.4%
Unaffiliated Investment Companies 8.7%
Multi-National 2.7%
Electric 2.3%
Foreign Government Obligations 2.2%
Pharmaceuticals 1.4%
REITS 1.3%
Diversified Financial Services 1.2%
Telecommunications 1.0%
Short-Term Investments 1.0%
Oil & Gas 0.9%
Auto Manufacturers 0.9%
Pipelines 0.9%
Semiconductors 0.8%
Portfolio Composition
(% of net assets)
Graphical Representation - Allocation 1 Chart
Credit Quality **
(% of total debt issues)
Graphical Representation - Allocation 2 Chart
*   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.
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.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000193974 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Fixed Income Intermediate Index
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 Fixed Income Intermediate Index Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Fixed Income Intermediate Index Portfolio (Class 3)* $29 0.58%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 29 [29]
Expense Ratio, Percent 0.58% [29],[30]
Net Assets $ 494,000,000
Holdings Count | Holding 1,009
Advisory Fees Paid, Amount $ 700,000
Investment Company Portfolio Turnover 70.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $494M
Total number of portfolio holdings 1,009
Total net advisory fee paid $0.7M
Portfolio turnover rate during the reporting period 70%
Holdings [Text Block]
Graphical Representation of Holdings
The information below represents the composition of the Portfolio as of the end of the period.
Top Industries*
(% of net assets)
U.S. Government & Agency Obligations 54.1%
Banks 9.4%
Unaffiliated Investment Companies 8.7%
Multi-National 2.7%
Electric 2.3%
Foreign Government Obligations 2.2%
Pharmaceuticals 1.4%
REITS 1.3%
Diversified Financial Services 1.2%
Telecommunications 1.0%
Short-Term Investments 1.0%
Oil & Gas 0.9%
Auto Manufacturers 0.9%
Pipelines 0.9%
Semiconductors 0.8%
Portfolio Composition
(% of net assets)
Graphical Representation - Allocation 1 Chart
Credit Quality **
(% of total debt issues)
Graphical Representation - Allocation 2 Chart
*   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.
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.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000021986 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Federated Hermes Corporate Bond
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 Federated Hermes Corporate Bond Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Federated Hermes Corporate Bond Portfolio (Class 3)* $40 0.80%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 40 [31]
Expense Ratio, Percent 0.80% [31],[32]
Net Assets $ 1,533,000,000
Holdings Count | Holding 812
Advisory Fees Paid, Amount $ 3,800,000
Investment Company Portfolio Turnover 11.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $1,533M
Total number of portfolio holdings 812
Total net advisory fee paid $3.8M
Portfolio turnover rate during the reporting period 11%
Holdings [Text Block]
Graphical Representation of Holdings
The information below represents the composition of the Portfolio as of the end of the period.
Top Industries*
(% of net assets)
Banks 17.1%
Short-Term Investments 5.1%
Telecommunications 5.1%
Electric 4.9%
U.S. Government & Agency Obligations 4.5%
Pharmaceuticals 4.3%
Software 3.5%
Oil & Gas 3.3%
Pipelines 3.3%
Media 3.1%
Commercial Services 2.8%
Computers 2.6%
Beverages 2.6%
Retail 2.5%
Insurance 2.4%
Portfolio Composition
(% of net assets)
Graphical Representation - Allocation 1 Chart
Credit Quality **
(% of total debt issues)
Graphical Representation - Allocation 2 Chart
*   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.
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.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000021984 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Federated Hermes Corporate Bond
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 Federated Hermes Corporate Bond Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Federated Hermes Corporate Bond Portfolio (Class 1)* $28 0.55%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 28 [33]
Expense Ratio, Percent 0.55% [33],[34]
Net Assets $ 1,533,000,000
Holdings Count | Holding 812
Advisory Fees Paid, Amount $ 3,800,000
Investment Company Portfolio Turnover 11.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $1,533M
Total number of portfolio holdings 812
Total net advisory fee paid $3.8M
Portfolio turnover rate during the reporting period 11%
Holdings [Text Block]
Graphical Representation of Holdings
The information below represents the composition of the Portfolio as of the end of the period.
Top Industries*
(% of net assets)
Banks 17.1%
Short-Term Investments 5.1%
Telecommunications 5.1%
Electric 4.9%
U.S. Government & Agency Obligations 4.5%
Pharmaceuticals 4.3%
Software 3.5%
Oil & Gas 3.3%
Pipelines 3.3%
Media 3.1%
Commercial Services 2.8%
Computers 2.6%
Beverages 2.6%
Retail 2.5%
Insurance 2.4%
Portfolio Composition
(% of net assets)
Graphical Representation - Allocation 1 Chart
Credit Quality **
(% of total debt issues)
Graphical Representation - Allocation 2 Chart
*   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.
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.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000021985 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Federated Hermes Corporate Bond
Class Name Class 2
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 Federated Hermes Corporate Bond Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Federated Hermes Corporate Bond Portfolio (Class 2)* $35 0.70%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 35 [35]
Expense Ratio, Percent 0.70% [35],[36]
Net Assets $ 1,533,000,000
Holdings Count | Holding 812
Advisory Fees Paid, Amount $ 3,800,000
Investment Company Portfolio Turnover 11.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $1,533M
Total number of portfolio holdings 812
Total net advisory fee paid $3.8M
Portfolio turnover rate during the reporting period 11%
Holdings [Text Block]
Graphical Representation of Holdings
The information below represents the composition of the Portfolio as of the end of the period.
Top Industries*
(% of net assets)
Banks 17.1%
Short-Term Investments 5.1%
Telecommunications 5.1%
Electric 4.9%
U.S. Government & Agency Obligations 4.5%
Pharmaceuticals 4.3%
Software 3.5%
Oil & Gas 3.3%
Pipelines 3.3%
Media 3.1%
Commercial Services 2.8%
Computers 2.6%
Beverages 2.6%
Retail 2.5%
Insurance 2.4%
Portfolio Composition
(% of net assets)
Graphical Representation - Allocation 1 Chart
Credit Quality **
(% of total debt issues)
Graphical Representation - Allocation 2 Chart
*   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.
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.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000021971 [Member]  
Shareholder Report [Line Items]  
Fund Name SA AB 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 AB Growth Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA AB Growth Portfolio (Class 3)* $45 0.88%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 45 [37]
Expense Ratio, Percent 0.88% [37],[38]
Net Assets $ 1,858,000,000
Holdings Count | Holding 56
Advisory Fees Paid, Amount $ 5,200,000
Investment Company Portfolio Turnover 14.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $1,858M
Total number of portfolio holdings 56
Total net advisory fee paid $5.2M
Portfolio turnover rate during the reporting period 14%
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.
Top Industries*
Semiconductors 24.4%
Internet 23.9%
Software 15.8%
Retail 7.1%
Diversified Financial Services 5.6%
Healthcare-Products 3.8%
Pharmaceuticals 3.3%
Beverages 2.3%
Commercial Services 1.9%
Biotechnology 1.6%
Telecommunications 1.4%
Chemicals 1.2%
Distribution/Wholesale 1.0%
Machinery-Diversified 1.0%
Insurance 0.9%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000021970 [Member]  
Shareholder Report [Line Items]  
Fund Name SA AB Growth
Class Name Class 2
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 AB Growth Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA AB Growth Portfolio (Class 2)* $40 0.78%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 40 [39]
Expense Ratio, Percent 0.78% [39],[40]
Net Assets $ 1,858,000,000
Holdings Count | Holding 56
Advisory Fees Paid, Amount $ 5,200,000
Investment Company Portfolio Turnover 14.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $1,858M
Total number of portfolio holdings 56
Total net advisory fee paid $5.2M
Portfolio turnover rate during the reporting period 14%
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.
Top Industries*
Semiconductors 24.4%
Internet 23.9%
Software 15.8%
Retail 7.1%
Diversified Financial Services 5.6%
Healthcare-Products 3.8%
Pharmaceuticals 3.3%
Beverages 2.3%
Commercial Services 1.9%
Biotechnology 1.6%
Telecommunications 1.4%
Chemicals 1.2%
Distribution/Wholesale 1.0%
Machinery-Diversified 1.0%
Insurance 0.9%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000021969 [Member]  
Shareholder Report [Line Items]  
Fund Name SA AB 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 AB Growth Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA AB Growth Portfolio (Class 1)* $32 0.63%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 32 [41]
Expense Ratio, Percent 0.63% [41],[42]
Net Assets $ 1,858,000,000
Holdings Count | Holding 56
Advisory Fees Paid, Amount $ 5,200,000
Investment Company Portfolio Turnover 14.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $1,858M
Total number of portfolio holdings 56
Total net advisory fee paid $5.2M
Portfolio turnover rate during the reporting period 14%
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.
Top Industries*
Semiconductors 24.4%
Internet 23.9%
Software 15.8%
Retail 7.1%
Diversified Financial Services 5.6%
Healthcare-Products 3.8%
Pharmaceuticals 3.3%
Beverages 2.3%
Commercial Services 1.9%
Biotechnology 1.6%
Telecommunications 1.4%
Chemicals 1.2%
Distribution/Wholesale 1.0%
Machinery-Diversified 1.0%
Insurance 0.9%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000021992 [Member]  
Shareholder Report [Line Items]  
Fund Name SA JPMorgan Mid-Cap 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 JPMorgan Mid-Cap Growth Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA JPMorgan Mid-Cap Growth Portfolio (Class 1)* $39 0.77%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 39 [43]
Expense Ratio, Percent 0.77% [43],[44]
Net Assets $ 715,000,000
Holdings Count | Holding 107
Advisory Fees Paid, Amount $ 2,400,000
Investment Company Portfolio Turnover 44.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $715M
Total number of portfolio holdings 107
Total net advisory fee paid $2.4M
Portfolio turnover rate during the reporting period 44%
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.
Top Industries*
Software 17.2%
Diversified Financial Services 8.3%
Retail 7.3%
Aerospace/Defense 5.3%
Internet 5.2%
Biotechnology 4.8%
Leisure Time 4.1%
Pharmaceuticals 3.9%
Miscellaneous Manufacturing 3.9%
Electric 3.3%
Healthcare-Products 3.1%
Lodging 2.9%
Computers 2.9%
Commercial Services 2.8%
Entertainment 2.6%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000021955 [Member]  
Shareholder Report [Line Items]  
Fund Name SA JPMorgan Ultra-Short Bond
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 JPMorgan Ultra-Short Bond Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. 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 Portfolio that occurred during the reporting period.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA JPMorgan Ultra-Short Bond Portfolio (Class 3)* $39 0.77%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 39 [45]
Expense Ratio, Percent 0.77% [45],[46]
Net Assets $ 346,000,000
Holdings Count | Holding 246
Advisory Fees Paid, Amount $ 800,000
Investment Company Portfolio Turnover 59.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $346M
Total number of portfolio holdings 246
Total net advisory fee paid $0.8M
Portfolio turnover rate during the reporting period 59%
Holdings [Text Block]
Graphical Representation of Holdings
The information below represents the composition of the Portfolio as of the end of the period.
Top Industries*
(% of net assets)
Banks 23.5%
Insurance 9.5%
Other Asset Backed Securities 8.3%
Auto Manufacturers 7.2%
Short-Term Investments 7.1%
Electric 6.8%
U.S. Government & Agency Obligations 6.6%
Auto Loan Receivables 3.7%
Diversified Financial Services 2.4%
Healthcare-Services 1.7%
Retail 1.4%
Pipelines 1.4%
Telecommunications 1.4%
Chemicals 1.3%
Credit Card Receivables 1.2%
Portfolio Composition
(% of net assets)
Graphical Representation - Allocation 1 Chart
Credit Quality **
(% of total debt issues)
Graphical Representation - Allocation 2 Chart
*   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.
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.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000021953 [Member]  
Shareholder Report [Line Items]  
Fund Name SA JPMorgan Ultra-Short Bond
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 JPMorgan Ultra-Short Bond Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. 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 Portfolio that occurred during the reporting period.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA JPMorgan Ultra-Short Bond Portfolio (Class 1)* $26 0.52%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 26 [47]
Expense Ratio, Percent 0.52% [47],[48]
Net Assets $ 346,000,000
Holdings Count | Holding 246
Advisory Fees Paid, Amount $ 800,000
Investment Company Portfolio Turnover 59.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $346M
Total number of portfolio holdings 246
Total net advisory fee paid $0.8M
Portfolio turnover rate during the reporting period 59%
Holdings [Text Block]
Graphical Representation of Holdings
The information below represents the composition of the Portfolio as of the end of the period.
Top Industries*
(% of net assets)
Banks 23.5%
Insurance 9.5%
Other Asset Backed Securities 8.3%
Auto Manufacturers 7.2%
Short-Term Investments 7.1%
Electric 6.8%
U.S. Government & Agency Obligations 6.6%
Auto Loan Receivables 3.7%
Diversified Financial Services 2.4%
Healthcare-Services 1.7%
Retail 1.4%
Pipelines 1.4%
Telecommunications 1.4%
Chemicals 1.3%
Credit Card Receivables 1.2%
Portfolio Composition
(% of net assets)
Graphical Representation - Allocation 1 Chart
Credit Quality **
(% of total debt issues)
Graphical Representation - Allocation 2 Chart
*   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.
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.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000021954 [Member]  
Shareholder Report [Line Items]  
Fund Name SA JPMorgan Ultra-Short Bond
Class Name Class 2
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 JPMorgan Ultra-Short Bond Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. 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 Portfolio that occurred during the reporting period.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA JPMorgan Ultra-Short Bond Portfolio (Class 2)* $34 0.67%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 34 [49]
Expense Ratio, Percent 0.67% [49],[50]
Net Assets $ 346,000,000
Holdings Count | Holding 246
Advisory Fees Paid, Amount $ 800,000
Investment Company Portfolio Turnover 59.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $346M
Total number of portfolio holdings 246
Total net advisory fee paid $0.8M
Portfolio turnover rate during the reporting period 59%
Holdings [Text Block]
Graphical Representation of Holdings
The information below represents the composition of the Portfolio as of the end of the period.
Top Industries*
(% of net assets)
Banks 23.5%
Insurance 9.5%
Other Asset Backed Securities 8.3%
Auto Manufacturers 7.2%
Short-Term Investments 7.1%
Electric 6.8%
U.S. Government & Agency Obligations 6.6%
Auto Loan Receivables 3.7%
Diversified Financial Services 2.4%
Healthcare-Services 1.7%
Retail 1.4%
Pipelines 1.4%
Telecommunications 1.4%
Chemicals 1.3%
Credit Card Receivables 1.2%
Portfolio Composition
(% of net assets)
Graphical Representation - Allocation 1 Chart
Credit Quality **
(% of total debt issues)
Graphical Representation - Allocation 2 Chart
*   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.
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.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000021962 [Member]  
Shareholder Report [Line Items]  
Fund Name SA JPMorgan Large Cap Core
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 JPMorgan Large Cap Core Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA JPMorgan Large Cap Core Portfolio (Class 3)* $48 0.94%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 48 [51]
Expense Ratio, Percent 0.94% [51],[52]
Net Assets $ 586,000,000
Holdings Count | Holding 52
Advisory Fees Paid, Amount $ 1,800,000
Investment Company Portfolio Turnover 25.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $586M
Total number of portfolio holdings 52
Total net advisory fee paid $1.8M
Portfolio turnover rate during the reporting period 25%
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.
Top Industries*
Semiconductors 14.0%
Software 12.3%
Internet 12.0%
Retail 6.8%
Diversified Financial Services 6.6%
Computers 5.7%
Banks 4.9%
Healthcare-Products 4.1%
Building Materials 3.7%
Electric 3.6%
Insurance 2.8%
Aerospace/Defense 2.7%
Oil & Gas Services 2.6%
Pharmaceuticals 2.4%
Media 1.9%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000021960 [Member]  
Shareholder Report [Line Items]  
Fund Name SA JPMorgan Large Cap Core
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 JPMorgan Large Cap Core Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA JPMorgan Large Cap Core Portfolio (Class 1)* $35 0.69%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 35 [53]
Expense Ratio, Percent 0.69% [53],[54]
Net Assets $ 586,000,000
Holdings Count | Holding 52
Advisory Fees Paid, Amount $ 1,800,000
Investment Company Portfolio Turnover 25.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $586M
Total number of portfolio holdings 52
Total net advisory fee paid $1.8M
Portfolio turnover rate during the reporting period 25%
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.
Top Industries*
Semiconductors 14.0%
Software 12.3%
Internet 12.0%
Retail 6.8%
Diversified Financial Services 6.6%
Computers 5.7%
Banks 4.9%
Healthcare-Products 4.1%
Building Materials 3.7%
Electric 3.6%
Insurance 2.8%
Aerospace/Defense 2.7%
Oil & Gas Services 2.6%
Pharmaceuticals 2.4%
Media 1.9%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000021961 [Member]  
Shareholder Report [Line Items]  
Fund Name SA JPMorgan Large Cap Core
Class Name Class 2
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 JPMorgan Large Cap Core Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA JPMorgan Large Cap Core Portfolio (Class 2)* $43 0.84%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 43 [55]
Expense Ratio, Percent 0.84% [55],[56]
Net Assets $ 586,000,000
Holdings Count | Holding 52
Advisory Fees Paid, Amount $ 1,800,000
Investment Company Portfolio Turnover 25.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $586M
Total number of portfolio holdings 52
Total net advisory fee paid $1.8M
Portfolio turnover rate during the reporting period 25%
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.
Top Industries*
Semiconductors 14.0%
Software 12.3%
Internet 12.0%
Retail 6.8%
Diversified Financial Services 6.6%
Computers 5.7%
Banks 4.9%
Healthcare-Products 4.1%
Building Materials 3.7%
Electric 3.6%
Insurance 2.8%
Aerospace/Defense 2.7%
Oil & Gas Services 2.6%
Pharmaceuticals 2.4%
Media 1.9%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000022031 [Member]  
Shareholder Report [Line Items]  
Fund Name SA JPMorgan MFS Core Bond
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 JPMorgan MFS Core Bond Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA JPMorgan MFS Core Bond Portfolio (Class 3)* $39 0.78%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 39 [57]
Expense Ratio, Percent 0.78% [57],[58]
Net Assets $ 1,830,000,000
Holdings Count | Holding 1,669
Advisory Fees Paid, Amount $ 4,400,000
Investment Company Portfolio Turnover 17.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $1,830M
Total number of portfolio holdings 1,669
Total net advisory fee paid $4.4M
Portfolio turnover rate during the reporting period 17%
Holdings [Text Block]
Graphical Representation of Holdings
The information below represents the composition of the Portfolio as of the end of the period.
Top Industries*
(% of net assets)
U.S. Government & Agency Obligations 46.9%
Collateralized Mortgage Obligations 11.3%
Banks 8.5%
Other Asset Backed Securities 6.3%
Auto Loan Receivables 2.7%
Diversified Financial Services 2.4%
Electric 2.4%
Pipelines 1.8%
REITS 1.4%
Healthcare-Services 1.3%
Short-Term Investments 1.0%
Insurance 1.0%
Oil & Gas 0.9%
Aerospace/Defense 0.9%
Telecommunications 0.9%
Portfolio Composition
(% of net assets)
Graphical Representation - Allocation 1 Chart
Credit Quality **
(% of total debt issues)
Graphical Representation - Allocation 2 Chart
*   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.
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.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000022029 [Member]  
Shareholder Report [Line Items]  
Fund Name SA JPMorgan MFS Core Bond
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 JPMorgan MFS Core Bond Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA JPMorgan MFS Core Bond Portfolio (Class 1)* $27 0.53%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 27 [59]
Expense Ratio, Percent 0.53% [59],[60]
Net Assets $ 1,830,000,000
Holdings Count | Holding 1,669
Advisory Fees Paid, Amount $ 4,400,000
Investment Company Portfolio Turnover 17.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $1,830M
Total number of portfolio holdings 1,669
Total net advisory fee paid $4.4M
Portfolio turnover rate during the reporting period 17%
Holdings [Text Block]
Graphical Representation of Holdings
The information below represents the composition of the Portfolio as of the end of the period.
Top Industries*
(% of net assets)
U.S. Government & Agency Obligations 46.9%
Collateralized Mortgage Obligations 11.3%
Banks 8.5%
Other Asset Backed Securities 6.3%
Auto Loan Receivables 2.7%
Diversified Financial Services 2.4%
Electric 2.4%
Pipelines 1.8%
REITS 1.4%
Healthcare-Services 1.3%
Short-Term Investments 1.0%
Insurance 1.0%
Oil & Gas 0.9%
Aerospace/Defense 0.9%
Telecommunications 0.9%
Portfolio Composition
(% of net assets)
Graphical Representation - Allocation 1 Chart
Credit Quality **
(% of total debt issues)
Graphical Representation - Allocation 2 Chart
*   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.
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.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000022030 [Member]  
Shareholder Report [Line Items]  
Fund Name SA JPMorgan MFS Core Bond
Class Name Class 2
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 JPMorgan MFS Core Bond Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA JPMorgan MFS Core Bond Portfolio (Class 2)* $34 0.68%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 34 [61]
Expense Ratio, Percent 0.68% [61],[62]
Net Assets $ 1,830,000,000
Holdings Count | Holding 1,669
Advisory Fees Paid, Amount $ 4,400,000
Investment Company Portfolio Turnover 17.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $1,830M
Total number of portfolio holdings 1,669
Total net advisory fee paid $4.4M
Portfolio turnover rate during the reporting period 17%
Holdings [Text Block]
Graphical Representation of Holdings
The information below represents the composition of the Portfolio as of the end of the period.
Top Industries*
(% of net assets)
U.S. Government & Agency Obligations 46.9%
Collateralized Mortgage Obligations 11.3%
Banks 8.5%
Other Asset Backed Securities 6.3%
Auto Loan Receivables 2.7%
Diversified Financial Services 2.4%
Electric 2.4%
Pipelines 1.8%
REITS 1.4%
Healthcare-Services 1.3%
Short-Term Investments 1.0%
Insurance 1.0%
Oil & Gas 0.9%
Aerospace/Defense 0.9%
Telecommunications 0.9%
Portfolio Composition
(% of net assets)
Graphical Representation - Allocation 1 Chart
Credit Quality **
(% of total debt issues)
Graphical Representation - Allocation 2 Chart
*   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.
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.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000109363 [Member]  
Shareholder Report [Line Items]  
Fund Name SA VCP Dynamic 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 VCP Dynamic Allocation Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA VCP Dynamic Allocation Portfolio (Class 3)* $25 0.50%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 25 [63]
Expense Ratio, Percent 0.50% [63],[64]
Net Assets $ 9,174,000,000
Holdings Count | Holding 66
Advisory Fees Paid, Amount $ 8,600,000
Investment Company Portfolio Turnover 12.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $9,174M
Total number of portfolio holdings 66
Total net advisory fee paid $8.6M
Portfolio turnover rate during the reporting period 12%
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
Graphical Representation - Allocation 1 Chart
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000169131 [Member]  
Shareholder Report [Line Items]  
Fund Name SA VCP Dynamic 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 VCP Dynamic Allocation Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA VCP Dynamic Allocation Portfolio (Class 1)* $12 0.24%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 12 [65]
Expense Ratio, Percent 0.24% [65],[66]
Net Assets $ 9,174,000,000
Holdings Count | Holding 66
Advisory Fees Paid, Amount $ 8,600,000
Investment Company Portfolio Turnover 12.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $9,174M
Total number of portfolio holdings 66
Total net advisory fee paid $8.6M
Portfolio turnover rate during the reporting period 12%
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
Graphical Representation - Allocation 1 Chart
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000177074 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Mid Cap Index
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 Mid Cap Index Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Mid Cap Index Portfolio (Class 3)* $30 0.61%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 30 [67]
Expense Ratio, Percent 0.61% [67],[68]
Net Assets $ 497,000,000
Holdings Count | Holding 405
Advisory Fees Paid, Amount $ 700,000
Investment Company Portfolio Turnover 10.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $497M
Total number of portfolio holdings 405
Total net advisory fee paid $0.7M
Portfolio turnover rate during the reporting period 10%
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.
Top Industries*
REITS 6.8%
Banks 6.4%
Retail 6.1%
Insurance 4.6%
Diversified Financial Services 4.3%
Software 4.1%
Commercial Services 4.0%
Machinery-Diversified 3.9%
Computers 3.5%
Electronics 3.5%
Engineering & Construction 3.5%
Oil & Gas 2.8%
Food 2.7%
Biotechnology 2.4%
Semiconductors 2.3%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000177073 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Mid Cap Index
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 Mid Cap Index Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Mid Cap Index Portfolio (Class 1)* $18 0.36%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 18 [69]
Expense Ratio, Percent 0.36% [69],[70]
Net Assets $ 497,000,000
Holdings Count | Holding 405
Advisory Fees Paid, Amount $ 700,000
Investment Company Portfolio Turnover 10.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $497M
Total number of portfolio holdings 405
Total net advisory fee paid $0.7M
Portfolio turnover rate during the reporting period 10%
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.
Top Industries*
REITS 6.8%
Banks 6.4%
Retail 6.1%
Insurance 4.6%
Diversified Financial Services 4.3%
Software 4.1%
Commercial Services 4.0%
Machinery-Diversified 3.9%
Computers 3.5%
Electronics 3.5%
Engineering & Construction 3.5%
Oil & Gas 2.8%
Food 2.7%
Biotechnology 2.4%
Semiconductors 2.3%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000171605 [Member]  
Shareholder Report [Line Items]  
Fund Name SA T. Rowe Price VCP Balanced
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 T. Rowe Price VCP Balanced Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. 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 Portfolio that occurred during the reporting period.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA T. Rowe Price VCP Balanced Portfolio (Class 1)* $42 0.83%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio. 
**
Annualized
Expenses Paid, Amount $ 42 [71]
Expense Ratio, Percent 0.83% [71],[72]
Net Assets $ 1,379,000,000
Holdings Count | Holding 1,599
Advisory Fees Paid, Amount $ 5,200,000
Investment Company Portfolio Turnover 20.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $1,379M
Total number of portfolio holdings 1,599
Total net advisory fee paid $5.2M
Portfolio turnover rate during the reporting period 20%
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.
Top Industries*
U.S. Government & Agency Obligations 15.0%
Short-Term Investments 12.0%
Semiconductors 6.2%
Internet 5.8%
Banks 5.6%
Software 4.8%
Insurance 3.6%
Oil & Gas 3.1%
Retail 2.8%
REITS 2.8%
Diversified Financial Services 2.7%
Pharmaceuticals 2.6%
Computers 2.2%
Healthcare-Products 1.9%
Electric 1.7%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000199992 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Large Cap Value Index
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 Large Cap Value Index Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Large Cap Value Index Portfolio (Class 3)* $30 0.60%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 30 [73]
Expense Ratio, Percent 0.60% [73],[74]
Net Assets $ 653,000,000
Holdings Count | Holding 402
Advisory Fees Paid, Amount $ 900,000
Investment Company Portfolio Turnover 9.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $653M
Total number of portfolio holdings 402
Total net advisory fee paid $0.9M
Portfolio turnover rate during the reporting period 9%
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.
Top Industries*
Software 9.4%
Computers 8.2%
Banks 7.4%
Pharmaceuticals 5.7%
Oil & Gas 5.1%
Semiconductors 5.0%
Retail 4.5%
Insurance 4.3%
Internet 4.1%
Healthcare-Products 4.0%
Electric 3.6%
Diversified Financial Services 3.0%
Telecommunications 3.0%
Aerospace/Defense 2.9%
REITS 2.9%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000199991 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Large Cap Value Index
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 Large Cap Value Index Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Large Cap Value Index Portfolio (Class 1)* $17 0.35%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 17 [75]
Expense Ratio, Percent 0.35% [75],[76]
Net Assets $ 653,000,000
Holdings Count | Holding 402
Advisory Fees Paid, Amount $ 900,000
Investment Company Portfolio Turnover 9.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $653M
Total number of portfolio holdings 402
Total net advisory fee paid $0.9M
Portfolio turnover rate during the reporting period 9%
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.
Top Industries*
Software 9.4%
Computers 8.2%
Banks 7.4%
Pharmaceuticals 5.7%
Oil & Gas 5.1%
Semiconductors 5.0%
Retail 4.5%
Insurance 4.3%
Internet 4.1%
Healthcare-Products 4.0%
Electric 3.6%
Diversified Financial Services 3.0%
Telecommunications 3.0%
Aerospace/Defense 2.9%
REITS 2.9%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000022012 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Fidelity Institutional AM® Global Equities(formerly SA JPMorgan Global Equities Portfolio)
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 Fidelity Institutional AM® Global Equities Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Fidelity Institutional AM® Global Equities Portfolio (Class 1)* $42 0.82%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 42 [77]
Expense Ratio, Percent 0.82% [77],[78]
Net Assets $ 340,000,000
Holdings Count | Holding 346
Advisory Fees Paid, Amount $ 1,200,000
Investment Company Portfolio Turnover 84.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $340M
Total number of portfolio holdings 346
Total net advisory fee paid $1.2M
Portfolio turnover rate during the reporting period 84%
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.
Top Industries*
Internet 10.5%
Banks 9.1%
Semiconductors 8.9%
Software 8.8%
Computers 5.6%
Repurchase Agreements 4.4%
Pharmaceuticals 3.5%
Diversified Financial Services 3.4%
Insurance 3.1%
Aerospace/Defense 2.8%
Telecommunications 2.8%
Oil & Gas 2.7%
Biotechnology 2.6%
Electric 2.1%
Beverages 2.0%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
Country
Graphical Representation - Allocation 2 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000022013 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Fidelity Institutional AM® Global Equities(formerly SA JPMorgan Global Equities Portfolio)
Class Name Class 2
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 Fidelity Institutional AM® Global Equities Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Fidelity Institutional AM® Global Equities Portfolio (Class 2)* $50 0.97%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 50 [79]
Expense Ratio, Percent 0.97% [79],[80]
Net Assets $ 340,000,000
Holdings Count | Holding 346
Advisory Fees Paid, Amount $ 1,200,000
Investment Company Portfolio Turnover 84.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $340M
Total number of portfolio holdings 346
Total net advisory fee paid $1.2M
Portfolio turnover rate during the reporting period 84%
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.
Top Industries*
Internet 10.5%
Banks 9.1%
Semiconductors 8.9%
Software 8.8%
Computers 5.6%
Repurchase Agreements 4.4%
Pharmaceuticals 3.5%
Diversified Financial Services 3.4%
Insurance 3.1%
Aerospace/Defense 2.8%
Telecommunications 2.8%
Oil & Gas 2.7%
Biotechnology 2.6%
Electric 2.1%
Beverages 2.0%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
Country
Graphical Representation - Allocation 2 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000022014 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Fidelity Institutional AM® Global Equities(formerly SA JPMorgan Global Equities Portfolio)
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 Fidelity Institutional AM® Global Equities Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Fidelity Institutional AM® Global Equities Portfolio (Class 3)* $55 1.07%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 55 [81]
Expense Ratio, Percent 1.07% [81],[82]
Net Assets $ 340,000,000
Holdings Count | Holding 346
Advisory Fees Paid, Amount $ 1,200,000
Investment Company Portfolio Turnover 84.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $340M
Total number of portfolio holdings 346
Total net advisory fee paid $1.2M
Portfolio turnover rate during the reporting period 84%
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.
Top Industries*
Internet 10.5%
Banks 9.1%
Semiconductors 8.9%
Software 8.8%
Computers 5.6%
Repurchase Agreements 4.4%
Pharmaceuticals 3.5%
Diversified Financial Services 3.4%
Insurance 3.1%
Aerospace/Defense 2.8%
Telecommunications 2.8%
Oil & Gas 2.7%
Biotechnology 2.6%
Electric 2.1%
Beverages 2.0%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
Country
Graphical Representation - Allocation 2 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000022001 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Janus Focused 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 Janus Focused Growth Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Janus Focused Growth Portfolio (Class 1)* $42 0.80%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 42 [83]
Expense Ratio, Percent 0.80% [83],[84]
Net Assets $ 523,000,000
Holdings Count | Holding 34
Advisory Fees Paid, Amount $ 1,700,000
Investment Company Portfolio Turnover 22.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $523M
Total number of portfolio holdings 34
Total net advisory fee paid $1.7M
Portfolio turnover rate during the reporting period 22%
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.
Top Industries*
Internet 24.3%
Semiconductors 21.6%
Software 20.6%
Diversified Financial Services 4.9%
Aerospace/Defense 3.6%
Computers 3.5%
Pharmaceuticals 3.5%
Private Equity 3.2%
Biotechnology 2.5%
Entertainment 2.4%
Electrical Components & Equipment 2.1%
Healthcare-Products 2.1%
Beverages 1.7%
REITS 1.1%
Healthcare-Services 1.1%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000022003 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Janus Focused 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 Janus Focused Growth Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Janus Focused Growth Portfolio (Class 3)* $55 1.05%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 55 [85]
Expense Ratio, Percent 1.05% [85],[86]
Net Assets $ 523,000,000
Holdings Count | Holding 34
Advisory Fees Paid, Amount $ 1,700,000
Investment Company Portfolio Turnover 22.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $523M
Total number of portfolio holdings 34
Total net advisory fee paid $1.7M
Portfolio turnover rate during the reporting period 22%
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.
Top Industries*
Internet 24.3%
Semiconductors 21.6%
Software 20.6%
Diversified Financial Services 4.9%
Aerospace/Defense 3.6%
Computers 3.5%
Pharmaceuticals 3.5%
Private Equity 3.2%
Biotechnology 2.5%
Entertainment 2.4%
Electrical Components & Equipment 2.1%
Healthcare-Products 2.1%
Beverages 1.7%
REITS 1.1%
Healthcare-Services 1.1%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000022002 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Janus Focused Growth
Class Name Class 2
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 Janus Focused Growth Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Janus Focused Growth Portfolio (Class 2)* $50 0.95%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 50 [87]
Expense Ratio, Percent 0.95% [87],[88]
Net Assets $ 523,000,000
Holdings Count | Holding 34
Advisory Fees Paid, Amount $ 1,700,000
Investment Company Portfolio Turnover 22.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $523M
Total number of portfolio holdings 34
Total net advisory fee paid $1.7M
Portfolio turnover rate during the reporting period 22%
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.
Top Industries*
Internet 24.3%
Semiconductors 21.6%
Software 20.6%
Diversified Financial Services 4.9%
Aerospace/Defense 3.6%
Computers 3.5%
Pharmaceuticals 3.5%
Private Equity 3.2%
Biotechnology 2.5%
Entertainment 2.4%
Electrical Components & Equipment 2.1%
Healthcare-Products 2.1%
Beverages 1.7%
REITS 1.1%
Healthcare-Services 1.1%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000214975 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Franklin Systematic U.S. Large Cap Core
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 Franklin Systematic U.S. Large Cap Core Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Franklin Systematic U.S. Large Cap Core Portfolio (Class 3)* $39 0.78%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 39 [89]
Expense Ratio, Percent 0.78% [89],[90]
Net Assets $ 311,000,000
Holdings Count | Holding 182
Advisory Fees Paid, Amount $ 700,000
Investment Company Portfolio Turnover 42.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $311M
Total number of portfolio holdings 182
Total net advisory fee paid $0.7M
Portfolio turnover rate during the reporting period 42%
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.
Top Industries*
Internet 16.9%
Semiconductors 14.0%
Software 12.5%
Computers 7.5%
Banks 4.2%
Pharmaceuticals 3.9%
Biotechnology 3.7%
Insurance 3.6%
Retail 2.9%
Diversified Financial Services 2.9%
Aerospace/Defense 2.7%
Auto Manufacturers 2.6%
Telecommunications 2.2%
Electric 1.9%
Healthcare-Products 1.9%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000214976 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Franklin Systematic U.S. Large Cap Core
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 Franklin Systematic U.S. Large Cap Core Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Franklin Systematic U.S. Large Cap Core Portfolio (Class 1)* $27 0.53%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 27 [91]
Expense Ratio, Percent 0.53% [91],[92]
Net Assets $ 311,000,000
Holdings Count | Holding 182
Advisory Fees Paid, Amount $ 700,000
Investment Company Portfolio Turnover 42.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $311M
Total number of portfolio holdings 182
Total net advisory fee paid $0.7M
Portfolio turnover rate during the reporting period 42%
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.
Top Industries*
Internet 16.9%
Semiconductors 14.0%
Software 12.5%
Computers 7.5%
Banks 4.2%
Pharmaceuticals 3.9%
Biotechnology 3.7%
Insurance 3.6%
Retail 2.9%
Diversified Financial Services 2.9%
Aerospace/Defense 2.7%
Auto Manufacturers 2.6%
Telecommunications 2.2%
Electric 1.9%
Healthcare-Products 1.9%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000199998 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Global Index Allocation 75/25
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 Global Index Allocation 75/25 Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Global Index Allocation 75/25 Portfolio (Class 1)* $9 0.18%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 9 [93]
Expense Ratio, Percent 0.18% [93],[94]
Net Assets $ 108,000,000
Holdings Count | Holding 7
Advisory Fees Paid, Amount $ 100,000
Investment Company Portfolio Turnover 6.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $108M
Total number of portfolio holdings 7
Total net advisory fee paid $0.1M
Portfolio turnover rate during the reporting period 6%
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
Graphical Representation - Allocation 1 Chart
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000199997 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Global Index Allocation 75/25
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 Global Index Allocation 75/25 Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Global Index Allocation 75/25 Portfolio (Class 3)* $22 0.43%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio. 
**
Annualized
Expenses Paid, Amount $ 22 [95]
Expense Ratio, Percent 0.43% [95],[96]
Net Assets $ 108,000,000
Holdings Count | Holding 7
Advisory Fees Paid, Amount $ 100,000
Investment Company Portfolio Turnover 6.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $108M
Total number of portfolio holdings 7
Total net advisory fee paid $0.1M
Portfolio turnover rate during the reporting period 6%
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
Graphical Representation - Allocation 1 Chart
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000211493 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Fidelity Institutional AM® International 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 Fidelity Institutional AM® International Growth Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Fidelity Institutional AM® International Growth Portfolio (Class 1)* $47 0.89%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio. 
**
Annualized
Expenses Paid, Amount $ 47 [97]
Expense Ratio, Percent 0.89% [97],[98]
Net Assets $ 265,000,000
Holdings Count | Holding 61
Advisory Fees Paid, Amount $ 900,000
Investment Company Portfolio Turnover 64.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $265M
Total number of portfolio holdings 61
Total net advisory fee paid $0.9M
Portfolio turnover rate during the reporting period 64%
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.
Top Industries*
Banks 9.6%
Internet 9.5%
Aerospace/Defense 8.8%
Building Materials 8.7%
Semiconductors 8.3%
Diversified Financial Services 7.1%
Machinery-Construction & Mining 6.1%
Software 5.8%
Insurance 5.8%
Commercial Services 5.6%
Electrical Components & Equipment 3.8%
Engineering & Construction 2.9%
Chemicals 2.7%
Electric 1.9%
Transportation 1.6%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
Country
Graphical Representation - Allocation 2 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000211494 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Fidelity Institutional AM® International 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 Fidelity Institutional AM® International Growth Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Fidelity Institutional AM® International Growth Portfolio (Class 3)* $60 1.14%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 60 [99]
Expense Ratio, Percent 1.14% [99],[100]
Net Assets $ 265,000,000
Holdings Count | Holding 61
Advisory Fees Paid, Amount $ 900,000
Investment Company Portfolio Turnover 64.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $265M
Total number of portfolio holdings 61
Total net advisory fee paid $0.9M
Portfolio turnover rate during the reporting period 64%
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.
Top Industries*
Banks 9.6%
Internet 9.5%
Aerospace/Defense 8.8%
Building Materials 8.7%
Semiconductors 8.3%
Diversified Financial Services 7.1%
Machinery-Construction & Mining 6.1%
Software 5.8%
Insurance 5.8%
Commercial Services 5.6%
Electrical Components & Equipment 3.8%
Engineering & Construction 2.9%
Chemicals 2.7%
Electric 1.9%
Transportation 1.6%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
Country
Graphical Representation - Allocation 2 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000199996 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Global Index Allocation 60/40
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 Global Index Allocation 60/40 Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Global Index Allocation 60/40 Portfolio (Class 3)* $22 0.43%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 22 [101]
Expense Ratio, Percent 0.43% [101],[102]
Net Assets $ 106,000,000
Holdings Count | Holding 7
Advisory Fees Paid, Amount $ 100,000
Investment Company Portfolio Turnover 7.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $106M
Total number of portfolio holdings 7
Total net advisory fee paid $0.1M
Portfolio turnover rate during the reporting period 7%
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
Graphical Representation - Allocation 1 Chart
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000199995 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Global Index Allocation 60/40
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 Global Index Allocation 60/40 Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Global Index Allocation 60/40 Portfolio (Class 1)* $9 0.18%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 9 [103]
Expense Ratio, Percent 0.18% [103],[104]
Net Assets $ 106,000,000
Holdings Count | Holding 7
Advisory Fees Paid, Amount $ 100,000
Investment Company Portfolio Turnover 7.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $106M
Total number of portfolio holdings 7
Total net advisory fee paid $0.1M
Portfolio turnover rate during the reporting period 7%
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
Graphical Representation - Allocation 1 Chart
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000199989 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Large Cap Growth Index
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 Large Cap Growth Index Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Large Cap Growth Index Portfolio (Class 1)* $18 0.35%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 18 [105]
Expense Ratio, Percent 0.35% [105],[106]
Net Assets $ 740,000,000
Holdings Count | Holding 216
Advisory Fees Paid, Amount $ 1,000,000.0
Investment Company Portfolio Turnover 12.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $740M
Total number of portfolio holdings 216
Total net advisory fee paid $1.0M
Portfolio turnover rate during the reporting period 12%
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.
Top Industries*
Internet 21.2%
Semiconductors 20.4%
Software 13.9%
Computers 6.6%
Diversified Financial Services 5.1%
Retail 4.2%
Auto Manufacturers 3.2%
Insurance 2.8%
Pharmaceuticals 2.5%
Banks 2.0%
Commercial Services 1.7%
Healthcare-Products 1.6%
Aerospace/Defense 1.4%
Machinery-Construction & Mining 1.3%
Electric 1.2%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000199990 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Large Cap Growth Index
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 Large Cap Growth Index Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Large Cap Growth Index Portfolio (Class 3)* $31 0.60%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 31 [107]
Expense Ratio, Percent 0.60% [107],[108]
Net Assets $ 740,000,000
Holdings Count | Holding 216
Advisory Fees Paid, Amount $ 1,000,000.0
Investment Company Portfolio Turnover 12.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $740M
Total number of portfolio holdings 216
Total net advisory fee paid $1.0M
Portfolio turnover rate during the reporting period 12%
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.
Top Industries*
Internet 21.2%
Semiconductors 20.4%
Software 13.9%
Computers 6.6%
Diversified Financial Services 5.1%
Retail 4.2%
Auto Manufacturers 3.2%
Insurance 2.8%
Pharmaceuticals 2.5%
Banks 2.0%
Commercial Services 1.7%
Healthcare-Products 1.6%
Aerospace/Defense 1.4%
Machinery-Construction & Mining 1.3%
Electric 1.2%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000022009 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Putnam International Value(formerly SA Putnam International Growth and Income Portfolio)
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 Putnam International Value Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. 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 Portfolio that occurred during the reporting period.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Putnam International Value Portfolio (Class 1)* $50 0.93%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 50 [109]
Expense Ratio, Percent 0.93% [109],[110]
Net Assets $ 325,000,000
Holdings Count | Holding 147
Advisory Fees Paid, Amount $ 1,300,000
Investment Company Portfolio Turnover 16.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $325M
Total number of portfolio holdings 147
Total net advisory fee paid $1.3M
Portfolio turnover rate during the reporting period 16%
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.
Top Industries*
Banks 24.5%
Insurance 10.4%
Oil & Gas 6.7%
Telecommunications 4.8%
Pharmaceuticals 4.6%
Building Materials 3.7%
Miscellaneous Manufacturing 3.5%
Electronics 3.5%
Retail 3.3%
Distribution/Wholesale 3.0%
Beverages 2.8%
Food 2.7%
Aerospace/Defense 2.5%
Cosmetics/Personal Care 1.8%
Mining 1.7%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
Country
Graphical Representation - Allocation 2 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000022010 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Putnam International Value(formerly SA Putnam International Growth and Income Portfolio)
Class Name Class 2
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 Putnam International Value Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. 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 Portfolio that occurred during the reporting period.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Putnam International Value Portfolio (Class 2)* $58 1.08%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio. 
**
Annualized
Expenses Paid, Amount $ 58 [111]
Expense Ratio, Percent 1.08% [111],[112]
Net Assets $ 325,000,000
Holdings Count | Holding 147
Advisory Fees Paid, Amount $ 1,300,000
Investment Company Portfolio Turnover 16.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $325M
Total number of portfolio holdings 147
Total net advisory fee paid $1.3M
Portfolio turnover rate during the reporting period 16%
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.
Top Industries*
Banks 24.5%
Insurance 10.4%
Oil & Gas 6.7%
Telecommunications 4.8%
Pharmaceuticals 4.6%
Building Materials 3.7%
Miscellaneous Manufacturing 3.5%
Electronics 3.5%
Retail 3.3%
Distribution/Wholesale 3.0%
Beverages 2.8%
Food 2.7%
Aerospace/Defense 2.5%
Cosmetics/Personal Care 1.8%
Mining 1.7%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
Country
Graphical Representation - Allocation 2 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000022011 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Putnam International Value(formerly SA Putnam International Growth and Income Portfolio)
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 Putnam International Value Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. 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 Portfolio that occurred during the reporting period.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Putnam International Value Portfolio (Class 3)* $64 1.18%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 64 [113]
Expense Ratio, Percent 1.18% [113],[114]
Net Assets $ 325,000,000
Holdings Count | Holding 147
Advisory Fees Paid, Amount $ 1,300,000
Investment Company Portfolio Turnover 16.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $325M
Total number of portfolio holdings 147
Total net advisory fee paid $1.3M
Portfolio turnover rate during the reporting period 16%
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.
Top Industries*
Banks 24.5%
Insurance 10.4%
Oil & Gas 6.7%
Telecommunications 4.8%
Pharmaceuticals 4.6%
Building Materials 3.7%
Miscellaneous Manufacturing 3.5%
Electronics 3.5%
Retail 3.3%
Distribution/Wholesale 3.0%
Beverages 2.8%
Food 2.7%
Aerospace/Defense 2.5%
Cosmetics/Personal Care 1.8%
Mining 1.7%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
Country
Graphical Representation - Allocation 2 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000193970 [Member]  
Shareholder Report [Line Items]  
Fund Name SA T. Rowe Price Allocation Moderately Aggressive(formerly SA T. Rowe Price Asset Allocation Growth Portfolio)
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 T. Rowe Price Allocation Moderately Aggressive Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA T. Rowe Price Allocation Moderately Aggressive Portfolio (Class 3)* $50 0.99%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 50 [115]
Expense Ratio, Percent 0.99% [115],[116]
Net Assets $ 773,000,000
Holdings Count | Holding 1,487
Advisory Fees Paid, Amount $ 2,600,000
Investment Company Portfolio Turnover 16.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $773M
Total number of portfolio holdings 1,487
Total net advisory fee paid $2.6M
Portfolio turnover rate during the reporting period 16%
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.
Top Industries*
U.S. Government & Agency Obligations 10.0%
Semiconductors 8.0%
Software 7.4%
Banks 7.0%
Internet 6.6%
Insurance 4.5%
Retail 4.4%
Diversified Financial Services 3.9%
Pharmaceuticals 3.5%
Computers 3.2%
Short-Term Investments 2.7%
Oil & Gas 2.6%
Healthcare-Products 2.6%
Aerospace/Defense 2.4%
Electric 2.0%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000193969 [Member]  
Shareholder Report [Line Items]  
Fund Name SA T. Rowe Price Allocation Moderately Aggressive(formerly SA T. Rowe Price Asset Allocation Growth Portfolio)
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 T. Rowe Price Allocation Moderately Aggressive Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA T. Rowe Price Allocation Moderately Aggressive Portfolio (Class 1)* $38 0.74%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 38 [117]
Expense Ratio, Percent 0.74% [117],[118]
Net Assets $ 773,000,000
Holdings Count | Holding 1,487
Advisory Fees Paid, Amount $ 2,600,000
Investment Company Portfolio Turnover 16.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $773M
Total number of portfolio holdings 1,487
Total net advisory fee paid $2.6M
Portfolio turnover rate during the reporting period 16%
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.
Top Industries*
U.S. Government & Agency Obligations 10.0%
Semiconductors 8.0%
Software 7.4%
Banks 7.0%
Internet 6.6%
Insurance 4.5%
Retail 4.4%
Diversified Financial Services 3.9%
Pharmaceuticals 3.5%
Computers 3.2%
Short-Term Investments 2.7%
Oil & Gas 2.6%
Healthcare-Products 2.6%
Aerospace/Defense 2.4%
Electric 2.0%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000021987 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Fidelity Institutional AM® Real Estate
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 Fidelity Institutional AM® Real Estate Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Fidelity Institutional AM® Real Estate Portfolio (Class 1)* $41 0.85%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 41 [119]
Expense Ratio, Percent 0.85% [119],[120]
Net Assets $ 247,000,000
Holdings Count | Holding 32
Advisory Fees Paid, Amount $ 900,000
Investment Company Portfolio Turnover 20.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $247M
Total number of portfolio holdings 32
Total net advisory fee paid $0.9M
Portfolio turnover rate during the reporting period 20%
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.
Top Industries*
REITS 97.4%
Real Estate 1.2%
Internet 1.1%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000021998 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Invesco Growth Opportunities
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 Invesco Growth Opportunities Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Invesco Growth Opportunities Portfolio (Class 1)* $40 0.82%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 40 [121]
Expense Ratio, Percent 0.82% [121],[122]
Net Assets $ 282,000,000
Holdings Count | Holding 110
Advisory Fees Paid, Amount $ 1,000,000.0
Investment Company Portfolio Turnover 58.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $282M
Total number of portfolio holdings 110
Total net advisory fee paid $1.0M
Portfolio turnover rate during the reporting period 58%
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.
Top Industries*
Electronics 8.8%
Diversified Financial Services 6.9%
Software 6.7%
Healthcare-Products 6.6%
Retail 6.0%
Biotechnology 5.3%
Semiconductors 4.7%
Aerospace/Defense 4.2%
Machinery-Diversified 4.0%
Commercial Services 3.9%
Miscellaneous Manufacturing 3.7%
Engineering & Construction 3.5%
Healthcare-Services 3.1%
Computers 3.0%
Internet 2.6%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000021988 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Fidelity Institutional AM® Real Estate
Class Name Class 2
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 Fidelity Institutional AM® Real Estate Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Fidelity Institutional AM® Real Estate Portfolio (Class 2)* $49 1.00%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 49 [123]
Expense Ratio, Percent 1.00% [123],[124]
Net Assets $ 247,000,000
Holdings Count | Holding 32
Advisory Fees Paid, Amount $ 900,000
Investment Company Portfolio Turnover 20.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $247M
Total number of portfolio holdings 32
Total net advisory fee paid $0.9M
Portfolio turnover rate during the reporting period 20%
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.
Top Industries*
REITS 97.4%
Real Estate 1.2%
Internet 1.1%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000021989 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Fidelity Institutional AM® Real Estate
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 Fidelity Institutional AM® Real Estate Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Fidelity Institutional AM® Real Estate Portfolio (Class 3)* $54 1.10%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 54 [125]
Expense Ratio, Percent 1.10% [125],[126]
Net Assets $ 247,000,000
Holdings Count | Holding 32
Advisory Fees Paid, Amount $ 900,000
Investment Company Portfolio Turnover 20.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $247M
Total number of portfolio holdings 32
Total net advisory fee paid $0.9M
Portfolio turnover rate during the reporting period 20%
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.
Top Industries*
REITS 97.4%
Real Estate 1.2%
Internet 1.1%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000022017 [Member]  
Shareholder Report [Line Items]  
Fund Name SA PIMCO Global Bond Opportunities
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 PIMCO Global Bond Opportunities Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. 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 Portfolio that occurred during the reporting period.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA PIMCO Global Bond Opportunities Portfolio (Class 3)* $59 1.17%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 59 [127]
Expense Ratio, Percent 1.17% [127],[128]
Net Assets $ 280,000,000
Holdings Count | Holding 511
Advisory Fees Paid, Amount $ 900,000
Investment Company Portfolio Turnover 150.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $280M
Total number of portfolio holdings 511
Total net advisory fee paid $0.9M
Portfolio turnover rate during the reporting period 150%
Holdings [Text Block]
Graphical Representation of Holdings
The information below represents the composition of the Portfolio as of the end of the period.
Top Industries*
(% of net assets)
U.S. Government & Agency Obligations 78.8%
Foreign Government Obligations 33.6%
Collateralized Mortgage Obligations 12.6%
Banks 10.5%
Other Asset Backed Securities 6.7%
Short-Term Investments 5.6%
Auto Loan Receivables 1.3%
Investment Companies 1.1%
Pharmaceuticals 0.6%
Credit Card Receivables 0.5%
Diversified Financial Services 0.4%
Healthcare-Products 0.4%
Semiconductors 0.4%
Insurance 0.3%
Agriculture 0.3%
Country
(% of net assets)
Graphical Representation - Allocation 1 Chart
Credit Quality **
(% of total debt issues)
Graphical Representation - Allocation 2 Chart
*   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.
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.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000022015 [Member]  
Shareholder Report [Line Items]  
Fund Name SA PIMCO Global Bond Opportunities
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 PIMCO Global Bond Opportunities Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. 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 Portfolio that occurred during the reporting period.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA PIMCO Global Bond Opportunities Portfolio (Class 1)* $46 0.92%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 46 [129]
Expense Ratio, Percent 0.92% [129],[130]
Net Assets $ 280,000,000
Holdings Count | Holding 511
Advisory Fees Paid, Amount $ 900,000
Investment Company Portfolio Turnover 150.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $280M
Total number of portfolio holdings 511
Total net advisory fee paid $0.9M
Portfolio turnover rate during the reporting period 150%
Holdings [Text Block]
Graphical Representation of Holdings
The information below represents the composition of the Portfolio as of the end of the period.
Top Industries*
(% of net assets)
U.S. Government & Agency Obligations 78.8%
Foreign Government Obligations 33.6%
Collateralized Mortgage Obligations 12.6%
Banks 10.5%
Other Asset Backed Securities 6.7%
Short-Term Investments 5.6%
Auto Loan Receivables 1.3%
Investment Companies 1.1%
Pharmaceuticals 0.6%
Credit Card Receivables 0.5%
Diversified Financial Services 0.4%
Healthcare-Products 0.4%
Semiconductors 0.4%
Insurance 0.3%
Agriculture 0.3%
Country
(% of net assets)
Graphical Representation - Allocation 1 Chart
Credit Quality **
(% of total debt issues)
Graphical Representation - Allocation 2 Chart
*   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.
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.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000022016 [Member]  
Shareholder Report [Line Items]  
Fund Name SA PIMCO Global Bond Opportunities
Class Name Class 2
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 PIMCO Global Bond Opportunities Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. 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 Portfolio that occurred during the reporting period.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA PIMCO Global Bond Opportunities Portfolio (Class 2)* $54 1.07%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 54 [131]
Expense Ratio, Percent 1.07% [131],[132]
Net Assets $ 280,000,000
Holdings Count | Holding 511
Advisory Fees Paid, Amount $ 900,000
Investment Company Portfolio Turnover 150.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $280M
Total number of portfolio holdings 511
Total net advisory fee paid $0.9M
Portfolio turnover rate during the reporting period 150%
Holdings [Text Block]
Graphical Representation of Holdings
The information below represents the composition of the Portfolio as of the end of the period.
Top Industries*
(% of net assets)
U.S. Government & Agency Obligations 78.8%
Foreign Government Obligations 33.6%
Collateralized Mortgage Obligations 12.6%
Banks 10.5%
Other Asset Backed Securities 6.7%
Short-Term Investments 5.6%
Auto Loan Receivables 1.3%
Investment Companies 1.1%
Pharmaceuticals 0.6%
Credit Card Receivables 0.5%
Diversified Financial Services 0.4%
Healthcare-Products 0.4%
Semiconductors 0.4%
Insurance 0.3%
Agriculture 0.3%
Country
(% of net assets)
Graphical Representation - Allocation 1 Chart
Credit Quality **
(% of total debt issues)
Graphical Representation - Allocation 2 Chart
*   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.
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.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000109738 [Member]  
Shareholder Report [Line Items]  
Fund Name SA AB Small & Mid Cap Value
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 AB Small & Mid Cap Value Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. 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 Portfolio that occurred during the reporting period.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA AB Small & Mid Cap Value Portfolio (Class 1)* $44 0.91%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 44 [133]
Expense Ratio, Percent 0.91% [133],[134]
Net Assets $ 476,000,000
Holdings Count | Holding 92
Advisory Fees Paid, Amount $ 2,000,000.0
Investment Company Portfolio Turnover 44.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $476M
Total number of portfolio holdings 92
Total net advisory fee paid $2.0M
Portfolio turnover rate during the reporting period 44%
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.
Top Industries*
Banks 9.6%
Retail 7.0%
REITS 6.6%
Commercial Services 6.6%
Computers 6.0%
Transportation 4.4%
Healthcare-Services 4.3%
Diversified Financial Services 3.6%
Oil & Gas 3.4%
Healthcare-Products 3.4%
Insurance 2.8%
Semiconductors 2.8%
Machinery-Diversified 2.5%
Chemicals 2.5%
Packaging & Containers 2.3%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000022007 [Member]  
Shareholder Report [Line Items]  
Fund Name SA AB Small & Mid Cap Value
Class Name Class 2
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 AB Small & Mid Cap Value Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. 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 Portfolio that occurred during the reporting period.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA AB Small & Mid Cap Value Portfolio (Class 2)* $51 1.06%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 51 [135]
Expense Ratio, Percent 1.06% [135],[136]
Net Assets $ 476,000,000
Holdings Count | Holding 92
Advisory Fees Paid, Amount $ 2,000,000.0
Investment Company Portfolio Turnover 44.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $476M
Total number of portfolio holdings 92
Total net advisory fee paid $2.0M
Portfolio turnover rate during the reporting period 44%
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.
Top Industries*
Banks 9.6%
Retail 7.0%
REITS 6.6%
Commercial Services 6.6%
Computers 6.0%
Transportation 4.4%
Healthcare-Services 4.3%
Diversified Financial Services 3.6%
Oil & Gas 3.4%
Healthcare-Products 3.4%
Insurance 2.8%
Semiconductors 2.8%
Machinery-Diversified 2.5%
Chemicals 2.5%
Packaging & Containers 2.3%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000022008 [Member]  
Shareholder Report [Line Items]  
Fund Name SA AB Small & Mid Cap Value
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 AB Small & Mid Cap Value Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. 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 Portfolio that occurred during the reporting period.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA AB Small & Mid Cap Value Portfolio (Class 3)* $56 1.16%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 56 [137]
Expense Ratio, Percent 1.16% [137],[138]
Net Assets $ 476,000,000
Holdings Count | Holding 92
Advisory Fees Paid, Amount $ 2,000,000.0
Investment Company Portfolio Turnover 44.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $476M
Total number of portfolio holdings 92
Total net advisory fee paid $2.0M
Portfolio turnover rate during the reporting period 44%
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.
Top Industries*
Banks 9.6%
Retail 7.0%
REITS 6.6%
Commercial Services 6.6%
Computers 6.0%
Transportation 4.4%
Healthcare-Services 4.3%
Diversified Financial Services 3.6%
Oil & Gas 3.4%
Healthcare-Products 3.4%
Insurance 2.8%
Semiconductors 2.8%
Machinery-Diversified 2.5%
Chemicals 2.5%
Packaging & Containers 2.3%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000109739 [Member]  
Shareholder Report [Line Items]  
Fund Name SA PIMCO RAE International Value
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 PIMCO RAE International Value Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA PIMCO RAE International Value Portfolio (Class 1)* $45 0.84%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 45 [139]
Expense Ratio, Percent 0.84% [139],[140]
Net Assets $ 428,000,000
Holdings Count | Holding 261
Advisory Fees Paid, Amount $ 1,600,000
Investment Company Portfolio Turnover 26.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $428M
Total number of portfolio holdings 261
Total net advisory fee paid $1.6M
Portfolio turnover rate during the reporting period 26%
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.
Top Industries*
Telecommunications 11.8%
Pharmaceuticals 10.8%
Insurance 7.7%
Chemicals 6.7%
Food 6.4%
Agriculture 6.1%
Transportation 6.0%
Auto Manufacturers 3.6%
Iron/Steel 3.6%
Mining 3.4%
Retail 3.2%
Auto Parts & Equipment 2.9%
Electric 2.6%
Commercial Services 2.4%
Banks 2.3%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
Country
Graphical Representation - Allocation 2 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000022024 [Member]  
Shareholder Report [Line Items]  
Fund Name SA PIMCO RAE International Value
Class Name Class 2
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 PIMCO RAE International Value Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA PIMCO RAE International Value Portfolio (Class 2)* $53 0.99%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 53 [141]
Expense Ratio, Percent 0.99% [141],[142]
Net Assets $ 428,000,000
Holdings Count | Holding 261
Advisory Fees Paid, Amount $ 1,600,000
Investment Company Portfolio Turnover 26.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $428M
Total number of portfolio holdings 261
Total net advisory fee paid $1.6M
Portfolio turnover rate during the reporting period 26%
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.
Top Industries*
Telecommunications 11.8%
Pharmaceuticals 10.8%
Insurance 7.7%
Chemicals 6.7%
Food 6.4%
Agriculture 6.1%
Transportation 6.0%
Auto Manufacturers 3.6%
Iron/Steel 3.6%
Mining 3.4%
Retail 3.2%
Auto Parts & Equipment 2.9%
Electric 2.6%
Commercial Services 2.4%
Banks 2.3%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
Country
Graphical Representation - Allocation 2 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000022034 [Member]  
Shareholder Report [Line Items]  
Fund Name SA JPMorgan Diversified Balanced
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 JPMorgan Diversified Balanced Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA JPMorgan Diversified Balanced Portfolio (Class 3)* $49 0.96%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 49 [143]
Expense Ratio, Percent 0.96% [143],[144]
Net Assets $ 429,000,000
Holdings Count | Holding 1,614
Advisory Fees Paid, Amount $ 1,200,000
Investment Company Portfolio Turnover 31.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $429M
Total number of portfolio holdings 1,614
Total net advisory fee paid $1.2M
Portfolio turnover rate during the reporting period 31%
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.
Top Industries*
Banks 10.3%
U.S. Government & Agency Obligations 8.3%
Internet 6.7%
Semiconductors 6.4%
Software 5.6%
Unaffiliated Investment Companies 4.3%
Other Asset Backed Securities 3.6%
Diversified Financial Services 3.5%
Electric 3.3%
Pharmaceuticals 3.2%
Retail 3.2%
Short-Term Investments 2.5%
Collateralized Mortgage Obligations 2.5%
Computers 2.4%
Insurance 2.2%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000022032 [Member]  
Shareholder Report [Line Items]  
Fund Name SA JPMorgan Diversified Balanced
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 JPMorgan Diversified Balanced Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA JPMorgan Diversified Balanced Portfolio (Class 1)* $36 0.71%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 36 [145]
Expense Ratio, Percent 0.71% [145],[146]
Net Assets $ 429,000,000
Holdings Count | Holding 1,614
Advisory Fees Paid, Amount $ 1,200,000
Investment Company Portfolio Turnover 31.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $429M
Total number of portfolio holdings 1,614
Total net advisory fee paid $1.2M
Portfolio turnover rate during the reporting period 31%
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.
Top Industries*
Banks 10.3%
U.S. Government & Agency Obligations 8.3%
Internet 6.7%
Semiconductors 6.4%
Software 5.6%
Unaffiliated Investment Companies 4.3%
Other Asset Backed Securities 3.6%
Diversified Financial Services 3.5%
Electric 3.3%
Pharmaceuticals 3.2%
Retail 3.2%
Short-Term Investments 2.5%
Collateralized Mortgage Obligations 2.5%
Computers 2.4%
Insurance 2.2%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000022033 [Member]  
Shareholder Report [Line Items]  
Fund Name SA JPMorgan Diversified Balanced
Class Name Class 2
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 JPMorgan Diversified Balanced Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA JPMorgan Diversified Balanced Portfolio (Class 2)* $44 0.86%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 44 [147]
Expense Ratio, Percent 0.86% [147],[148]
Net Assets $ 429,000,000
Holdings Count | Holding 1,614
Advisory Fees Paid, Amount $ 1,200,000
Investment Company Portfolio Turnover 31.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $429M
Total number of portfolio holdings 1,614
Total net advisory fee paid $1.2M
Portfolio turnover rate during the reporting period 31%
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.
Top Industries*
Banks 10.3%
U.S. Government & Agency Obligations 8.3%
Internet 6.7%
Semiconductors 6.4%
Software 5.6%
Unaffiliated Investment Companies 4.3%
Other Asset Backed Securities 3.6%
Diversified Financial Services 3.5%
Electric 3.3%
Pharmaceuticals 3.2%
Retail 3.2%
Short-Term Investments 2.5%
Collateralized Mortgage Obligations 2.5%
Computers 2.4%
Insurance 2.2%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000022025 [Member]  
Shareholder Report [Line Items]  
Fund Name SA PIMCO RAE International Value
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 PIMCO RAE International Value Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA PIMCO RAE International Value Portfolio (Class 3)* $58 1.09%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 58 [149]
Expense Ratio, Percent 1.09% [149],[150]
Net Assets $ 428,000,000
Holdings Count | Holding 261
Advisory Fees Paid, Amount $ 1,600,000
Investment Company Portfolio Turnover 26.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $428M
Total number of portfolio holdings 261
Total net advisory fee paid $1.6M
Portfolio turnover rate during the reporting period 26%
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.
Top Industries*
Telecommunications 11.8%
Pharmaceuticals 10.8%
Insurance 7.7%
Chemicals 6.7%
Food 6.4%
Agriculture 6.1%
Transportation 6.0%
Auto Manufacturers 3.6%
Iron/Steel 3.6%
Mining 3.4%
Retail 3.2%
Auto Parts & Equipment 2.9%
Electric 2.6%
Commercial Services 2.4%
Banks 2.3%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
Country
Graphical Representation - Allocation 2 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000199999 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Global Index Allocation 90/10
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 Global Index Allocation 90/10 Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block]  You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Global Index Allocation 90/10 Portfolio (Class 1)* $7 0.13%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 7 [151]
Expense Ratio, Percent 0.13% [151],[152]
Net Assets $ 397,000,000
Holdings Count | Holding 7
Advisory Fees Paid, Amount $ 200,000
Investment Company Portfolio Turnover 5.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $397M
Total number of portfolio holdings 7
Total net advisory fee paid $0.2M
Portfolio turnover rate during the reporting period 5%
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
Graphical Representation - Allocation 1 Chart
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000200000 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Global Index Allocation 90/10
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 Global Index Allocation 90/10 Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Global Index Allocation 90/10 Portfolio (Class 3)* $19 0.38%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 19 [153]
Expense Ratio, Percent 0.38% [153],[154]
Net Assets $ 397,000,000
Holdings Count | Holding 7
Advisory Fees Paid, Amount $ 200,000
Investment Company Portfolio Turnover 5.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $397M
Total number of portfolio holdings 7
Total net advisory fee paid $0.2M
Portfolio turnover rate during the reporting period 5%
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
Graphical Representation - Allocation 1 Chart
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000222244 [Member]  
Shareholder Report [Line Items]  
Fund Name SA BlackRock Multi-Factor 70/30
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 BlackRock Multi-Factor 70/30 Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA BlackRock Multi-Factor 70/30 Portfolio (Class 3)* $30 0.60%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 30 [155]
Expense Ratio, Percent 0.60% [155],[156]
Net Assets $ 115,000,000
Holdings Count | Holding 14
Advisory Fees Paid, Amount $ 100,000
Investment Company Portfolio Turnover 57.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $115M
Total number of portfolio holdings 14
Total net advisory fee paid $0.1M
Portfolio turnover rate during the reporting period 57%
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
Graphical Representation - Allocation 1 Chart
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000222243 [Member]  
Shareholder Report [Line Items]  
Fund Name SA BlackRock Multi-Factor 70/30
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 BlackRock Multi-Factor 70/30 Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA BlackRock Multi-Factor 70/30 Portfolio (Class 1)* $18 0.35%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 18 [157]
Expense Ratio, Percent 0.35% [157],[158]
Net Assets $ 115,000,000
Holdings Count | Holding 14
Advisory Fees Paid, Amount $ 100,000
Investment Company Portfolio Turnover 57.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $115M
Total number of portfolio holdings 14
Total net advisory fee paid $0.1M
Portfolio turnover rate during the reporting period 57%
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
Graphical Representation - Allocation 1 Chart
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000022035 [Member]  
Shareholder Report [Line Items]  
Fund Name SA MFS Total Return
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 MFS Total Return Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA MFS Total Return Portfolio (Class 1)* $36 0.71%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 36 [159]
Expense Ratio, Percent 0.71% [159],[160]
Net Assets $ 481,000,000
Holdings Count | Holding 805
Advisory Fees Paid, Amount $ 1,500,000
Investment Company Portfolio Turnover 14.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $481M
Total number of portfolio holdings 805
Total net advisory fee paid $1.5M
Portfolio turnover rate during the reporting period 14%
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.
Top Industries*
U.S. Government & Agency Obligations 20.4%
Banks 10.4%
Pharmaceuticals 6.2%
Insurance 5.0%
Oil & Gas 4.8%
Collateralized Mortgage Obligations 4.7%
Diversified Financial Services 4.4%
Electric 4.3%
Software 3.5%
Building Materials 2.7%
Healthcare-Products 2.4%
Healthcare-Services 2.4%
Agriculture 2.1%
Aerospace/Defense 2.0%
Media 2.0%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000022036 [Member]  
Shareholder Report [Line Items]  
Fund Name SA MFS Total Return
Class Name Class 2
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 MFS Total Return Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA MFS Total Return Portfolio (Class 2)* $43 0.86%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 43 [161]
Expense Ratio, Percent 0.86% [161],[162]
Net Assets $ 481,000,000
Holdings Count | Holding 805
Advisory Fees Paid, Amount $ 1,500,000
Investment Company Portfolio Turnover 14.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $481M
Total number of portfolio holdings 805
Total net advisory fee paid $1.5M
Portfolio turnover rate during the reporting period 14%
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.
Top Industries*
U.S. Government & Agency Obligations 20.4%
Banks 10.4%
Pharmaceuticals 6.2%
Insurance 5.0%
Oil & Gas 4.8%
Collateralized Mortgage Obligations 4.7%
Diversified Financial Services 4.4%
Electric 4.3%
Software 3.5%
Building Materials 2.7%
Healthcare-Products 2.4%
Healthcare-Services 2.4%
Agriculture 2.1%
Aerospace/Defense 2.0%
Media 2.0%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000022037 [Member]  
Shareholder Report [Line Items]  
Fund Name SA MFS Total Return
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 MFS Total Return Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA MFS Total Return Portfolio (Class 3)* $48 0.96%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 48 [163]
Expense Ratio, Percent 0.96% [163],[164]
Net Assets $ 481,000,000
Holdings Count | Holding 805
Advisory Fees Paid, Amount $ 1,500,000
Investment Company Portfolio Turnover 14.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $481M
Total number of portfolio holdings 805
Total net advisory fee paid $1.5M
Portfolio turnover rate during the reporting period 14%
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.
Top Industries*
U.S. Government & Agency Obligations 20.4%
Banks 10.4%
Pharmaceuticals 6.2%
Insurance 5.0%
Oil & Gas 4.8%
Collateralized Mortgage Obligations 4.7%
Diversified Financial Services 4.4%
Electric 4.3%
Software 3.5%
Building Materials 2.7%
Healthcare-Products 2.4%
Healthcare-Services 2.4%
Agriculture 2.1%
Aerospace/Defense 2.0%
Media 2.0%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000171604 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Schroders VCP Global 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 Schroders VCP Global Allocation Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Schroders VCP Global Allocation Portfolio (Class 1)* $45 0.90%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 45 [165]
Expense Ratio, Percent 0.90% [165],[166]
Net Assets $ 418,000,000
Holdings Count | Holding 964
Advisory Fees Paid, Amount $ 1,700,000
Investment Company Portfolio Turnover 23.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $418M
Total number of portfolio holdings 964
Total net advisory fee paid $1.7M
Portfolio turnover rate during the reporting period 23%
Holdings [Text Block]
Graphical Representation of Holdings
The information below represents the composition of the Portfolio as of the end of the period.
Top Industries*
(% of net assets)
Banks 17.1%
Internet 6.5%
Semiconductors 6.5%
Insurance 5.8%
Software 5.7%
Pharmaceuticals 5.0%
Diversified Financial Services 4.0%
REITS 3.5%
Electric 3.2%
Short-Term Investments 2.9%
Oil & Gas 2.8%
Telecommunications 2.6%
Retail 2.4%
Computers 2.4%
Auto Manufacturers 2.2%
Country
(% of net assets)
Graphical Representation - Allocation 1 Chart
Credit Quality **
(% of total debt issues)
Graphical Representation - Allocation 2 Chart
*   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.
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.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000164959 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Schroders VCP Global 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 Schroders VCP Global Allocation Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Schroders VCP Global Allocation Portfolio (Class 3)* $58 1.15%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 58 [167]
Expense Ratio, Percent 1.15% [167],[168]
Net Assets $ 418,000,000
Holdings Count | Holding 964
Advisory Fees Paid, Amount $ 1,700,000
Investment Company Portfolio Turnover 23.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $418M
Total number of portfolio holdings 964
Total net advisory fee paid $1.7M
Portfolio turnover rate during the reporting period 23%
Holdings [Text Block]
Graphical Representation of Holdings
The information below represents the composition of the Portfolio as of the end of the period.
Top Industries*
(% of net assets)
Banks 17.1%
Internet 6.5%
Semiconductors 6.5%
Insurance 5.8%
Software 5.7%
Pharmaceuticals 5.0%
Diversified Financial Services 4.0%
REITS 3.5%
Electric 3.2%
Short-Term Investments 2.9%
Oil & Gas 2.8%
Telecommunications 2.6%
Retail 2.4%
Computers 2.4%
Auto Manufacturers 2.2%
Country
(% of net assets)
Graphical Representation - Allocation 1 Chart
Credit Quality **
(% of total debt issues)
Graphical Representation - Allocation 2 Chart
*   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.
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.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000177076 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Small Cap Index
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 Small Cap Index Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. 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 Portfolio that occurred during the reporting period.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Small Cap Index Portfolio (Class 3)* $32 0.66%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 32 [169]
Expense Ratio, Percent 0.66% [169],[170]
Net Assets $ 294,000,000
Holdings Count | Holding 2,006
Advisory Fees Paid, Amount $ 400,000
Investment Company Portfolio Turnover 21.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $294M
Total number of portfolio holdings 2,006
Total net advisory fee paid $0.4M
Portfolio turnover rate during the reporting period 21%
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.
Top Industries*
Banks 9.4%
Biotechnology 6.3%
REITS 6.3%
Software 5.5%
Commercial Services 4.5%
Retail 3.9%
Healthcare-Products 3.3%
Diversified Financial Services 3.1%
Electronics 2.9%
Pharmaceuticals 2.6%
Engineering & Construction 2.5%
Telecommunications 2.5%
Oil & Gas 2.3%
Insurance 2.1%
Healthcare-Services 2.1%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000021993 [Member]  
Shareholder Report [Line Items]  
Fund Name SA JPMorgan Mid-Cap Growth
Class Name Class 2
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 JPMorgan Mid-Cap Growth Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA JPMorgan Mid-Cap Growth Portfolio (Class 2)* $46 0.92%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 46 [171]
Expense Ratio, Percent 0.92% [171],[172]
Net Assets $ 715,000,000
Holdings Count | Holding 107
Advisory Fees Paid, Amount $ 2,400,000
Investment Company Portfolio Turnover 44.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $715M
Total number of portfolio holdings 107
Total net advisory fee paid $2.4M
Portfolio turnover rate during the reporting period 44%
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.
Top Industries*
Software 17.2%
Diversified Financial Services 8.3%
Retail 7.3%
Aerospace/Defense 5.3%
Internet 5.2%
Biotechnology 4.8%
Leisure Time 4.1%
Pharmaceuticals 3.9%
Miscellaneous Manufacturing 3.9%
Electric 3.3%
Healthcare-Products 3.1%
Lodging 2.9%
Computers 2.9%
Commercial Services 2.8%
Entertainment 2.6%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000021994 [Member]  
Shareholder Report [Line Items]  
Fund Name SA JPMorgan Mid-Cap 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 JPMorgan Mid-Cap Growth Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA JPMorgan Mid-Cap Growth Portfolio (Class 3)* $51 1.02%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 51 [173]
Expense Ratio, Percent 1.02% [173],[174]
Net Assets $ 715,000,000
Holdings Count | Holding 107
Advisory Fees Paid, Amount $ 2,400,000
Investment Company Portfolio Turnover 44.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $715M
Total number of portfolio holdings 107
Total net advisory fee paid $2.4M
Portfolio turnover rate during the reporting period 44%
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.
Top Industries*
Software 17.2%
Diversified Financial Services 8.3%
Retail 7.3%
Aerospace/Defense 5.3%
Internet 5.2%
Biotechnology 4.8%
Leisure Time 4.1%
Pharmaceuticals 3.9%
Miscellaneous Manufacturing 3.9%
Electric 3.3%
Healthcare-Products 3.1%
Lodging 2.9%
Computers 2.9%
Commercial Services 2.8%
Entertainment 2.6%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000177080 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Index Allocation 80/20
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 Index Allocation 80/20 Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Index Allocation 80/20 Portfolio (Class 3)* $19 0.37%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio. 
**
Annualized
Expenses Paid, Amount $ 19 [175]
Expense Ratio, Percent 0.37% [175],[176]
Net Assets $ 529,000,000
Holdings Count | Holding 6
Advisory Fees Paid, Amount $ 300,000
Investment Company Portfolio Turnover 2.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $529M
Total number of portfolio holdings 6
Total net advisory fee paid $0.3M
Portfolio turnover rate during the reporting period 2%
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
Graphical Representation - Allocation 1 Chart
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000177079 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Index Allocation 80/20
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 Index Allocation 80/20 Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Index Allocation 80/20 Portfolio (Class 1)* $6 0.12%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 6 [177]
Expense Ratio, Percent 0.12% [177],[178]
Net Assets $ 529,000,000
Holdings Count | Holding 6
Advisory Fees Paid, Amount $ 300,000
Investment Company Portfolio Turnover 2.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $529M
Total number of portfolio holdings 6
Total net advisory fee paid $0.3M
Portfolio turnover rate during the reporting period 2%
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
Graphical Representation - Allocation 1 Chart
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000177071 [Member]  
Shareholder Report [Line Items]  
Fund Name SA International Index
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 International Index Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA International Index Portfolio (Class 1)* $25 0.47%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 25 [179]
Expense Ratio, Percent 0.47% [179],[180]
Net Assets $ 967,000,000
Holdings Count | Holding 700
Advisory Fees Paid, Amount $ 1,800,000
Investment Company Portfolio Turnover 11.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $967M
Total number of portfolio holdings 700
Total net advisory fee paid $1.8M
Portfolio turnover rate during the reporting period 11%
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.
Top Industries*
Banks 15.5%
Pharmaceuticals 7.2%
Insurance 6.4%
Aerospace/Defense 3.5%
Oil & Gas 3.3%
Telecommunications 3.2%
Semiconductors 3.2%
Food 3.0%
Electric 2.9%
Commercial Services 2.7%
Auto Manufacturers 2.6%
Software 2.6%
Machinery-Construction & Mining 2.2%
Chemicals 2.2%
Mining 2.1%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
Country
Graphical Representation - Allocation 2 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000177072 [Member]  
Shareholder Report [Line Items]  
Fund Name SA International Index
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 International Index Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA International Index Portfolio (Class 3)* $38 0.72%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 38 [181]
Expense Ratio, Percent 0.72% [181],[182]
Net Assets $ 967,000,000
Holdings Count | Holding 700
Advisory Fees Paid, Amount $ 1,800,000
Investment Company Portfolio Turnover 11.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $967M
Total number of portfolio holdings 700
Total net advisory fee paid $1.8M
Portfolio turnover rate during the reporting period 11%
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.
Top Industries*
Banks 15.5%
Pharmaceuticals 7.2%
Insurance 6.4%
Aerospace/Defense 3.5%
Oil & Gas 3.3%
Telecommunications 3.2%
Semiconductors 3.2%
Food 3.0%
Electric 2.9%
Commercial Services 2.7%
Auto Manufacturers 2.6%
Software 2.6%
Machinery-Construction & Mining 2.2%
Chemicals 2.2%
Mining 2.1%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
Country
Graphical Representation - Allocation 2 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000177077 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Index Allocation 60/40
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 Index Allocation 60/40 Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Index Allocation 60/40 Portfolio (Class 3)* $20 0.39%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 20 [183]
Expense Ratio, Percent 0.39% [183],[184]
Net Assets $ 273,000,000
Holdings Count | Holding 6
Advisory Fees Paid, Amount $ 100,000
Investment Company Portfolio Turnover 4.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $273M
Total number of portfolio holdings 6
Total net advisory fee paid $0.1M
Portfolio turnover rate during the reporting period 4%
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
Graphical Representation - Allocation 1 Chart
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000177078 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Index Allocation 60/40
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 Index Allocation 60/40 Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Index Allocation 60/40 Portfolio (Class 1)* $7 0.14%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 7 [185]
Expense Ratio, Percent 0.14% [185],[186]
Net Assets $ 273,000,000
Holdings Count | Holding 6
Advisory Fees Paid, Amount $ 100,000
Investment Company Portfolio Turnover 4.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $273M
Total number of portfolio holdings 6
Total net advisory fee paid $0.1M
Portfolio turnover rate during the reporting period 4%
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
Graphical Representation - Allocation 1 Chart
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000191735 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Franklin Tactical Opportunities
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 Franklin Tactical Opportunities Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Franklin Tactical Opportunities Portfolio (Class 1)* $41 0.81%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 41 [187]
Expense Ratio, Percent 0.81% [187],[188]
Net Assets $ 105,000,000
Holdings Count | Holding 1,079
Advisory Fees Paid, Amount $ 400,000
Investment Company Portfolio Turnover 51.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $105M
Total number of portfolio holdings 1,079
Total net advisory fee paid $0.4M
Portfolio turnover rate during the reporting period 51%
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.
Top Industries*
U.S. Government & Agency Obligations 17.8%
Internet 7.6%
Semiconductors 6.5%
Banks 6.3%
Software 5.9%
Unaffiliated Investment Companies 5.3%
Pharmaceuticals 4.0%
Collateralized Mortgage Obligations 3.4%
Short-Term Investments 3.3%
Insurance 3.2%
Retail 3.0%
Telecommunications 2.7%
Diversified Financial Services 2.6%
Computers 2.4%
Aerospace/Defense 1.9%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000191736 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Franklin Tactical Opportunities
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 Franklin Tactical Opportunities Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Franklin Tactical Opportunities Portfolio (Class 3)* $54 1.06%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 54 [189]
Expense Ratio, Percent 1.06% [189],[190]
Net Assets $ 105,000,000
Holdings Count | Holding 1,079
Advisory Fees Paid, Amount $ 400,000
Investment Company Portfolio Turnover 51.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $105M
Total number of portfolio holdings 1,079
Total net advisory fee paid $0.4M
Portfolio turnover rate during the reporting period 51%
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.
Top Industries*
U.S. Government & Agency Obligations 17.8%
Internet 7.6%
Semiconductors 6.5%
Banks 6.3%
Software 5.9%
Unaffiliated Investment Companies 5.3%
Pharmaceuticals 4.0%
Collateralized Mortgage Obligations 3.4%
Short-Term Investments 3.3%
Insurance 3.2%
Retail 3.0%
Telecommunications 2.7%
Diversified Financial Services 2.6%
Computers 2.4%
Aerospace/Defense 1.9%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000193972 [Member]  
Shareholder Report [Line Items]  
Fund Name SA VCP Index 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 VCP Index Allocation Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA VCP Index Allocation Portfolio (Class 3)* $26 0.52%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 26 [191]
Expense Ratio, Percent 0.52% [191],[192]
Net Assets $ 553,000,000
Holdings Count | Holding 19
Advisory Fees Paid, Amount $ 500,000
Investment Company Portfolio Turnover 6.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $553M
Total number of portfolio holdings 19
Total net advisory fee paid $0.5M
Portfolio turnover rate during the reporting period 6%
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
Graphical Representation - Allocation 1 Chart
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000193971 [Member]  
Shareholder Report [Line Items]  
Fund Name SA VCP Index 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 VCP Index Allocation Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA VCP Index Allocation Portfolio (Class 1)* $13 0.26%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 13 [193]
Expense Ratio, Percent 0.26% [193],[194]
Net Assets $ 553,000,000
Holdings Count | Holding 19
Advisory Fees Paid, Amount $ 500,000
Investment Company Portfolio Turnover 6.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $553M
Total number of portfolio holdings 19
Total net advisory fee paid $0.5M
Portfolio turnover rate during the reporting period 6%
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
Graphical Representation - Allocation 1 Chart
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000021983 [Member]  
Shareholder Report [Line Items]  
Fund Name SA MFS Large Cap Growth(formerly SA MFS Blue Chip Growth Portfolio)
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 MFS Large Cap Growth Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA MFS Large Cap Growth Portfolio (Class 3)* $48 0.93%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 48 [195]
Expense Ratio, Percent 0.93% [195],[196]
Net Assets $ 858,000,000
Holdings Count | Holding 88
Advisory Fees Paid, Amount $ 2,300,000
Investment Company Portfolio Turnover 36.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $858M
Total number of portfolio holdings 88
Total net advisory fee paid $2.3M
Portfolio turnover rate during the reporting period 36%
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.
Top Industries*
Software 22.6%
Semiconductors 20.0%
Internet 19.3%
Computers 10.5%
Diversified Financial Services 3.9%
Pharmaceuticals 3.0%
Banks 2.2%
Retail 2.0%
Auto Manufacturers 1.7%
Aerospace/Defense 1.7%
Healthcare-Services 1.4%
Telecommunications 1.2%
Building Materials 1.2%
Insurance 1.2%
Apparel 1.1%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000021981 [Member]  
Shareholder Report [Line Items]  
Fund Name SA MFS Large Cap Growth(formerly SA MFS Blue Chip Growth Portfolio)
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 MFS Large Cap Growth Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA MFS Large Cap Growth Portfolio (Class 1)* $35 0.68%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 35 [197]
Expense Ratio, Percent 0.68% [197],[198]
Net Assets $ 858,000,000
Holdings Count | Holding 88
Advisory Fees Paid, Amount $ 2,300,000
Investment Company Portfolio Turnover 36.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $858M
Total number of portfolio holdings 88
Total net advisory fee paid $2.3M
Portfolio turnover rate during the reporting period 36%
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.
Top Industries*
Software 22.6%
Semiconductors 20.0%
Internet 19.3%
Computers 10.5%
Diversified Financial Services 3.9%
Pharmaceuticals 3.0%
Banks 2.2%
Retail 2.0%
Auto Manufacturers 1.7%
Aerospace/Defense 1.7%
Healthcare-Services 1.4%
Telecommunications 1.2%
Building Materials 1.2%
Insurance 1.2%
Apparel 1.1%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000021982 [Member]  
Shareholder Report [Line Items]  
Fund Name SA MFS Large Cap Growth(formerly SA MFS Blue Chip Growth Portfolio)
Class Name Class 2
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 MFS Large Cap Growth Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA MFS Large Cap Growth Portfolio (Class 2)* $42 0.83%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 42 [199]
Expense Ratio, Percent 0.83% [199],[200]
Net Assets $ 858,000,000
Holdings Count | Holding 88
Advisory Fees Paid, Amount $ 2,300,000
Investment Company Portfolio Turnover 36.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $858M
Total number of portfolio holdings 88
Total net advisory fee paid $2.3M
Portfolio turnover rate during the reporting period 36%
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.
Top Industries*
Software 22.6%
Semiconductors 20.0%
Internet 19.3%
Computers 10.5%
Diversified Financial Services 3.9%
Pharmaceuticals 3.0%
Banks 2.2%
Retail 2.0%
Auto Manufacturers 1.7%
Aerospace/Defense 1.7%
Healthcare-Services 1.4%
Telecommunications 1.2%
Building Materials 1.2%
Insurance 1.2%
Apparel 1.1%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000021991 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Franklin Small Company Value
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 Franklin Small Company Value Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Franklin Small Company Value Portfolio (Class 3)* $59 1.20%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 59 [201]
Expense Ratio, Percent 1.20% [201],[202]
Net Assets $ 283,000,000
Holdings Count | Holding 82
Advisory Fees Paid, Amount $ 1,200,000
Investment Company Portfolio Turnover 28.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $283M
Total number of portfolio holdings 82
Total net advisory fee paid $1.2M
Portfolio turnover rate during the reporting period 28%
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.
Top Industries*
Banks 16.2%
Machinery-Diversified 8.6%
Electronics 8.0%
Insurance 7.5%
Chemicals 4.4%
Diversified Financial Services 4.3%
Metal Fabricate/Hardware 4.0%
Aerospace/Defense 3.8%
Lodging 3.4%
Healthcare-Products 3.4%
Commercial Services 2.9%
Software 2.9%
Iron/Steel 2.7%
Retail 2.5%
REITS 2.5%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000164960 [Member]  
Shareholder Report [Line Items]  
Fund Name SA T. Rowe Price VCP Balanced
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 T. Rowe Price VCP Balanced Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. 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 Portfolio that occurred during the reporting period.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA T. Rowe Price VCP Balanced Portfolio (Class 3)* $55 1.08%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 55 [203]
Expense Ratio, Percent 1.08% [203],[204]
Net Assets $ 1,379,000,000
Holdings Count | Holding 1,599
Advisory Fees Paid, Amount $ 5,200,000
Investment Company Portfolio Turnover 20.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $1,379M
Total number of portfolio holdings 1,599
Total net advisory fee paid $5.2M
Portfolio turnover rate during the reporting period 20%
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.
Top Industries*
U.S. Government & Agency Obligations 15.0%
Short-Term Investments 12.0%
Semiconductors 6.2%
Internet 5.8%
Banks 5.6%
Software 4.8%
Insurance 3.6%
Oil & Gas 3.1%
Retail 2.8%
REITS 2.8%
Diversified Financial Services 2.7%
Pharmaceuticals 2.6%
Computers 2.2%
Healthcare-Products 1.9%
Electric 1.7%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000177075 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Small Cap Index
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 Small Cap Index Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. 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 Portfolio that occurred during the reporting period.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Small Cap Index Portfolio (Class 1)* $20 0.41%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 20 [205]
Expense Ratio, Percent 0.41% [205],[206]
Net Assets $ 294,000,000
Holdings Count | Holding 2,006
Advisory Fees Paid, Amount $ 400,000
Investment Company Portfolio Turnover 21.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $294M
Total number of portfolio holdings 2,006
Total net advisory fee paid $0.4M
Portfolio turnover rate during the reporting period 21%
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.
Top Industries*
Banks 9.4%
Biotechnology 6.3%
REITS 6.3%
Software 5.5%
Commercial Services 4.5%
Retail 3.9%
Healthcare-Products 3.3%
Diversified Financial Services 3.1%
Electronics 2.9%
Pharmaceuticals 2.6%
Engineering & Construction 2.5%
Telecommunications 2.5%
Oil & Gas 2.3%
Insurance 2.1%
Healthcare-Services 2.1%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000177069 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Fixed Income Index
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 Fixed Income Index Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Fixed Income Index Portfolio (Class 1)* $17 0.34%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 17 [207]
Expense Ratio, Percent 0.34% [207],[208]
Net Assets $ 552,000,000
Holdings Count | Holding 1,252
Advisory Fees Paid, Amount $ 800,000
Investment Company Portfolio Turnover 66.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $552M
Total number of portfolio holdings 1,252
Total net advisory fee paid $0.8M
Portfolio turnover rate during the reporting period 66%
Holdings [Text Block]
Graphical Representation of Holdings
The information below represents the composition of the Portfolio as of the end of the period.
Top Industries*
(% of net assets)
U.S. Government & Agency Obligations 53.6%
Banks 7.7%
Unaffiliated Investment Companies 6.9%
Electric 2.7%
Foreign Government Obligations 2.4%
Multi-National 1.8%
Pharmaceuticals 1.5%
Telecommunications 1.5%
Diversified Financial Services 1.4%
Healthcare-Services 1.3%
REITS 1.2%
Pipelines 1.2%
Oil & Gas 1.0%
Retail 0.9%
Software 0.9%
Portfolio Composition
(% of net assets)
Graphical Representation - Allocation 1 Chart
Credit Quality **
(% of total debt issues)
Graphical Representation - Allocation 2 Chart
*   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.
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.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000177070 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Fixed Income Index
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 Fixed Income Index Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Fixed Income Index Portfolio (Class 3)* $30 0.59%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 30 [209]
Expense Ratio, Percent 0.59% [209],[210]
Net Assets $ 552,000,000
Holdings Count | Holding 1,252
Advisory Fees Paid, Amount $ 800,000
Investment Company Portfolio Turnover 66.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $552M
Total number of portfolio holdings 1,252
Total net advisory fee paid $0.8M
Portfolio turnover rate during the reporting period 66%
Holdings [Text Block]
Graphical Representation of Holdings
The information below represents the composition of the Portfolio as of the end of the period.
Top Industries*
(% of net assets)
U.S. Government & Agency Obligations 53.6%
Banks 7.7%
Unaffiliated Investment Companies 6.9%
Electric 2.7%
Foreign Government Obligations 2.4%
Multi-National 1.8%
Pharmaceuticals 1.5%
Telecommunications 1.5%
Diversified Financial Services 1.4%
Healthcare-Services 1.3%
REITS 1.2%
Pipelines 1.2%
Oil & Gas 1.0%
Retail 0.9%
Software 0.9%
Portfolio Composition
(% of net assets)
Graphical Representation - Allocation 1 Chart
Credit Quality **
(% of total debt issues)
Graphical Representation - Allocation 2 Chart
*   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.
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.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000177081 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Index Allocation 90/10
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 Index Allocation 90/10 Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Index Allocation 90/10 Portfolio (Class 1)* $6 0.11%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio. 
**
Annualized
Expenses Paid, Amount $ 6 [211]
Expense Ratio, Percent 0.11% [211],[212]
Net Assets $ 1,489,000,000
Holdings Count | Holding 6
Advisory Fees Paid, Amount $ 700,000
Investment Company Portfolio Turnover 2.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $1,489M
Total number of portfolio holdings 6
Total net advisory fee paid $0.7M
Portfolio turnover rate during the reporting period 2%
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
Graphical Representation - Allocation 1 Chart
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000177082 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Index Allocation 90/10
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 Index Allocation 90/10 Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Index Allocation 90/10 Portfolio (Class 3)* $18 0.36%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 18 [213]
Expense Ratio, Percent 0.36% [213],[214]
Net Assets $ 1,489,000,000
Holdings Count | Holding 6
Advisory Fees Paid, Amount $ 700,000
Investment Company Portfolio Turnover 2.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $1,489M
Total number of portfolio holdings 6
Total net advisory fee paid $0.7M
Portfolio turnover rate during the reporting period 2%
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
Graphical Representation - Allocation 1 Chart
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000115991 [Member]  
Shareholder Report [Line Items]  
Fund Name SA VCP Dynamic Strategy
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 VCP Dynamic Strategy Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA VCP Dynamic Strategy Portfolio (Class 3)* $26 0.51%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 26 [215]
Expense Ratio, Percent 0.51% [215],[216]
Net Assets $ 4,882,000,000
Holdings Count | Holding 67
Advisory Fees Paid, Amount $ 5,200,000
Investment Company Portfolio Turnover 5.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $4,882M
Total number of portfolio holdings 67
Total net advisory fee paid $5.2M
Portfolio turnover rate during the reporting period 5%
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
Graphical Representation - Allocation 1 Chart
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000021977 [Member]  
Shareholder Report [Line Items]  
Fund Name SA MFS Massachusetts Investors Trust
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 MFS Massachusetts Investors Trust Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA MFS Massachusetts Investors Trust Portfolio (Class 3)* $48 0.95%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio. 
**
Annualized
Expenses Paid, Amount $ 48 [217]
Expense Ratio, Percent 0.95% [217],[218]
Net Assets $ 644,000,000
Holdings Count | Holding 67
Advisory Fees Paid, Amount $ 2,100,000
Investment Company Portfolio Turnover 19.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $644M
Total number of portfolio holdings 67
Total net advisory fee paid $2.1M
Portfolio turnover rate during the reporting period 19%
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.
Top Industries*
Internet 13.8%
Software 12.6%
Semiconductors 10.5%
Diversified Financial Services 6.4%
Banks 5.5%
Computers 5.3%
Healthcare-Products 5.2%
Electronics 4.5%
Electrical Components & Equipment 4.1%
Insurance 4.0%
Electric 3.2%
Cosmetics/Personal Care 3.1%
Aerospace/Defense 2.7%
Oil & Gas 2.7%
Pharmaceuticals 2.5%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000169132 [Member]  
Shareholder Report [Line Items]  
Fund Name SA VCP Dynamic Strategy
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 VCP Dynamic Strategy Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA VCP Dynamic Strategy Portfolio (Class 1)* $13 0.26%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 13 [219]
Expense Ratio, Percent 0.26% [219],[220]
Net Assets $ 4,882,000,000
Holdings Count | Holding 67
Advisory Fees Paid, Amount $ 5,200,000
Investment Company Portfolio Turnover 5.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $4,882M
Total number of portfolio holdings 67
Total net advisory fee paid $5.2M
Portfolio turnover rate during the reporting period 5%
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
Graphical Representation - Allocation 1 Chart
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000021975 [Member]  
Shareholder Report [Line Items]  
Fund Name SA MFS Massachusetts Investors Trust
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 MFS Massachusetts Investors Trust Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA MFS Massachusetts Investors Trust Portfolio (Class 1)* $35 0.70%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 35 [221]
Expense Ratio, Percent 0.70% [221],[222]
Net Assets $ 644,000,000
Holdings Count | Holding 67
Advisory Fees Paid, Amount $ 2,100,000
Investment Company Portfolio Turnover 19.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $644M
Total number of portfolio holdings 67
Total net advisory fee paid $2.1M
Portfolio turnover rate during the reporting period 19%
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.
Top Industries*
Internet 13.8%
Software 12.6%
Semiconductors 10.5%
Diversified Financial Services 6.4%
Banks 5.5%
Computers 5.3%
Healthcare-Products 5.2%
Electronics 4.5%
Electrical Components & Equipment 4.1%
Insurance 4.0%
Electric 3.2%
Cosmetics/Personal Care 3.1%
Aerospace/Defense 2.7%
Oil & Gas 2.7%
Pharmaceuticals 2.5%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000021976 [Member]  
Shareholder Report [Line Items]  
Fund Name SA MFS Massachusetts Investors Trust
Class Name Class 2
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 MFS Massachusetts Investors Trust Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA MFS Massachusetts Investors Trust Portfolio (Class 2)* $43 0.85%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 43 [223]
Expense Ratio, Percent 0.85% [223],[224]
Net Assets $ 644,000,000
Holdings Count | Holding 67
Advisory Fees Paid, Amount $ 2,100,000
Investment Company Portfolio Turnover 19.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $644M
Total number of portfolio holdings 67
Total net advisory fee paid $2.1M
Portfolio turnover rate during the reporting period 19%
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.
Top Industries*
Internet 13.8%
Software 12.6%
Semiconductors 10.5%
Diversified Financial Services 6.4%
Banks 5.5%
Computers 5.3%
Healthcare-Products 5.2%
Electronics 4.5%
Electrical Components & Equipment 4.1%
Insurance 4.0%
Electric 3.2%
Cosmetics/Personal Care 3.1%
Aerospace/Defense 2.7%
Oil & Gas 2.7%
Pharmaceuticals 2.5%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000021965 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Franklin BW U.S. Large Cap Value
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 Franklin BW U.S. Large Cap Value Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Franklin BW U.S. Large Cap Value Portfolio (Class 3)* $47 0.95%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 47 [225]
Expense Ratio, Percent 0.95% [225],[226]
Net Assets $ 1,212,000,000
Holdings Count | Holding 221
Advisory Fees Paid, Amount $ 3,900,000
Investment Company Portfolio Turnover 40.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $1,212M
Total number of portfolio holdings 221
Total net advisory fee paid $3.9M
Portfolio turnover rate during the reporting period 40%
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.
Top Industries*
Banks 20.5%
Pharmaceuticals 7.5%
Insurance 7.5%
Telecommunications 6.9%
Media 4.0%
Biotechnology 3.8%
Electric 3.4%
Retail 3.2%
Healthcare-Services 2.9%
Food 2.7%
Diversified Financial Services 2.4%
Machinery-Construction & Mining 2.4%
Aerospace/Defense 2.3%
Auto Manufacturers 2.2%
Oil & Gas 2.2%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000021964 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Franklin BW U.S. Large Cap Value
Class Name Class 2
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 Franklin BW U.S. Large Cap Value Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Franklin BW U.S. Large Cap Value Portfolio (Class 2)* $42 0.85%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 42 [227]
Expense Ratio, Percent 0.85% [227],[228]
Net Assets $ 1,212,000,000
Holdings Count | Holding 221
Advisory Fees Paid, Amount $ 3,900,000
Investment Company Portfolio Turnover 40.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $1,212M
Total number of portfolio holdings 221
Total net advisory fee paid $3.9M
Portfolio turnover rate during the reporting period 40%
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.
Top Industries*
Banks 20.5%
Pharmaceuticals 7.5%
Insurance 7.5%
Telecommunications 6.9%
Media 4.0%
Biotechnology 3.8%
Electric 3.4%
Retail 3.2%
Healthcare-Services 2.9%
Food 2.7%
Diversified Financial Services 2.4%
Machinery-Construction & Mining 2.4%
Aerospace/Defense 2.3%
Auto Manufacturers 2.2%
Oil & Gas 2.2%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000021963 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Franklin BW U.S. Large Cap Value
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 Franklin BW U.S. Large Cap Value Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Franklin BW U.S. Large Cap Value Portfolio (Class 1)* $35 0.70%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 35 [229]
Expense Ratio, Percent 0.70% [229],[230]
Net Assets $ 1,212,000,000
Holdings Count | Holding 221
Advisory Fees Paid, Amount $ 3,900,000
Investment Company Portfolio Turnover 40.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $1,212M
Total number of portfolio holdings 221
Total net advisory fee paid $3.9M
Portfolio turnover rate during the reporting period 40%
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.
Top Industries*
Banks 20.5%
Pharmaceuticals 7.5%
Insurance 7.5%
Telecommunications 6.9%
Media 4.0%
Biotechnology 3.8%
Electric 3.4%
Retail 3.2%
Healthcare-Services 2.9%
Food 2.7%
Diversified Financial Services 2.4%
Machinery-Construction & Mining 2.4%
Aerospace/Defense 2.3%
Auto Manufacturers 2.2%
Oil & Gas 2.2%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000021956 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Large Cap Index
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 Large Cap Index Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Large Cap Index Portfolio (Class 1)* $13 0.26%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 13 [231]
Expense Ratio, Percent 0.26% [231],[232]
Net Assets $ 3,399,000,000
Holdings Count | Holding 506
Advisory Fees Paid, Amount $ 3,600,000
Investment Company Portfolio Turnover 7.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $3,399M
Total number of portfolio holdings 506
Total net advisory fee paid $3.6M
Portfolio turnover rate during the reporting period 7%
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.
Top Industries*
Semiconductors 13.4%
Internet 13.4%
Software 11.9%
Computers 7.4%
Banks 4.5%
Retail 4.4%
Diversified Financial Services 4.2%
Pharmaceuticals 4.0%
Insurance 3.5%
Healthcare-Products 2.7%
Oil & Gas 2.4%
Electric 2.3%
Aerospace/Defense 2.1%
Auto Manufacturers 2.0%
Telecommunications 1.9%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000183180 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Large Cap Index
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 Large Cap Index Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Large Cap Index Portfolio (Class 3)* $26 0.51%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 26 [233]
Expense Ratio, Percent 0.51% [233],[234]
Net Assets $ 3,399,000,000
Holdings Count | Holding 506
Advisory Fees Paid, Amount $ 3,600,000
Investment Company Portfolio Turnover 7.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $3,399M
Total number of portfolio holdings 506
Total net advisory fee paid $3.6M
Portfolio turnover rate during the reporting period 7%
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.
Top Industries*
Semiconductors 13.4%
Internet 13.4%
Software 11.9%
Computers 7.4%
Banks 4.5%
Retail 4.4%
Diversified Financial Services 4.2%
Pharmaceuticals 4.0%
Insurance 3.5%
Healthcare-Products 2.7%
Oil & Gas 2.4%
Electric 2.3%
Aerospace/Defense 2.1%
Auto Manufacturers 2.0%
Telecommunications 1.9%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000022000 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Invesco Growth Opportunities
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 Invesco Growth Opportunities Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Invesco Growth Opportunities Portfolio (Class 3)* $52 1.07%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 52 [235]
Expense Ratio, Percent 1.07% [235],[236]
Net Assets $ 282,000,000
Holdings Count | Holding 110
Advisory Fees Paid, Amount $ 1,000,000.0
Investment Company Portfolio Turnover 58.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $282M
Total number of portfolio holdings 110
Total net advisory fee paid $1.0M
Portfolio turnover rate during the reporting period 58%
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.
Top Industries*
Electronics 8.8%
Diversified Financial Services 6.9%
Software 6.7%
Healthcare-Products 6.6%
Retail 6.0%
Biotechnology 5.3%
Semiconductors 4.7%
Aerospace/Defense 4.2%
Machinery-Diversified 4.0%
Commercial Services 3.9%
Miscellaneous Manufacturing 3.7%
Engineering & Construction 3.5%
Healthcare-Services 3.1%
Computers 3.0%
Internet 2.6%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000021999 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Invesco Growth Opportunities
Class Name Class 2
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 Invesco Growth Opportunities Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Invesco Growth Opportunities Portfolio (Class 2)* $47 0.97%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 47 [237]
Expense Ratio, Percent 0.97% [237],[238]
Net Assets $ 282,000,000
Holdings Count | Holding 110
Advisory Fees Paid, Amount $ 1,000,000.0
Investment Company Portfolio Turnover 58.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $282M
Total number of portfolio holdings 110
Total net advisory fee paid $1.0M
Portfolio turnover rate during the reporting period 58%
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.
Top Industries*
Electronics 8.8%
Diversified Financial Services 6.9%
Software 6.7%
Healthcare-Products 6.6%
Retail 6.0%
Biotechnology 5.3%
Semiconductors 4.7%
Aerospace/Defense 4.2%
Machinery-Diversified 4.0%
Commercial Services 3.9%
Miscellaneous Manufacturing 3.7%
Engineering & Construction 3.5%
Healthcare-Services 3.1%
Computers 3.0%
Internet 2.6%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000021990 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Franklin Small Company Value
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 Franklin Small Company Value Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Franklin Small Company Value Portfolio (Class 1)* $46 0.95%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 46 [239]
Expense Ratio, Percent 0.95% [239],[240]
Net Assets $ 283,000,000
Holdings Count | Holding 82
Advisory Fees Paid, Amount $ 1,200,000
Investment Company Portfolio Turnover 28.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $283M
Total number of portfolio holdings 82
Total net advisory fee paid $1.2M
Portfolio turnover rate during the reporting period 28%
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.
Top Industries*
Banks 16.2%
Machinery-Diversified 8.6%
Electronics 8.0%
Insurance 7.5%
Chemicals 4.4%
Diversified Financial Services 4.3%
Metal Fabricate/Hardware 4.0%
Aerospace/Defense 3.8%
Lodging 3.4%
Healthcare-Products 3.4%
Commercial Services 2.9%
Software 2.9%
Iron/Steel 2.7%
Retail 2.5%
REITS 2.5%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000021968 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Franklin Systematic U.S. Large Cap Value
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 Franklin Systematic U.S. Large Cap Value Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Franklin Systematic U.S. Large Cap Value Portfolio (Class 3)* $44 0.89%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 44 [241]
Expense Ratio, Percent 0.89% [241],[242]
Net Assets $ 566,000,000
Holdings Count | Holding 144
Advisory Fees Paid, Amount $ 1,600,000
Investment Company Portfolio Turnover 42.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $566M
Total number of portfolio holdings 144
Total net advisory fee paid $1.6M
Portfolio turnover rate during the reporting period 42%
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.
Top Industries*
Banks 13.1%
Insurance 7.1%
Healthcare-Products 5.7%
Internet 5.4%
Retail 5.3%
Telecommunications 4.8%
Oil & Gas 3.4%
Software 3.1%
Electric 3.1%
REITS 3.1%
Biotechnology 2.8%
Semiconductors 2.7%
Diversified Financial Services 2.6%
Building Materials 2.5%
Auto Manufacturers 2.3%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000021967 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Franklin Systematic U.S. Large Cap Value
Class Name Class 2
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 Franklin Systematic U.S. Large Cap Value Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Franklin Systematic U.S. Large Cap Value Portfolio (Class 2)* $39 0.79%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 39 [243]
Expense Ratio, Percent 0.79% [243],[244]
Net Assets $ 566,000,000
Holdings Count | Holding 144
Advisory Fees Paid, Amount $ 1,600,000
Investment Company Portfolio Turnover 42.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $566M
Total number of portfolio holdings 144
Total net advisory fee paid $1.6M
Portfolio turnover rate during the reporting period 42%
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.
Top Industries*
Banks 13.1%
Insurance 7.1%
Healthcare-Products 5.7%
Internet 5.4%
Retail 5.3%
Telecommunications 4.8%
Oil & Gas 3.4%
Software 3.1%
Electric 3.1%
REITS 3.1%
Biotechnology 2.8%
Semiconductors 2.7%
Diversified Financial Services 2.6%
Building Materials 2.5%
Auto Manufacturers 2.3%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000021966 [Member]  
Shareholder Report [Line Items]  
Fund Name SA Franklin Systematic U.S. Large Cap Value
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 Franklin Systematic U.S. Large Cap Value Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA Franklin Systematic U.S. Large Cap Value Portfolio (Class 1)* $32 0.64%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 32 [245]
Expense Ratio, Percent 0.64% [245],[246]
Net Assets $ 566,000,000
Holdings Count | Holding 144
Advisory Fees Paid, Amount $ 1,600,000
Investment Company Portfolio Turnover 42.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $566M
Total number of portfolio holdings 144
Total net advisory fee paid $1.6M
Portfolio turnover rate during the reporting period 42%
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.
Top Industries*
Banks 13.1%
Insurance 7.1%
Healthcare-Products 5.7%
Internet 5.4%
Retail 5.3%
Telecommunications 4.8%
Oil & Gas 3.4%
Software 3.1%
Electric 3.1%
REITS 3.1%
Biotechnology 2.8%
Semiconductors 2.7%
Diversified Financial Services 2.6%
Building Materials 2.5%
Auto Manufacturers 2.3%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000021957 [Member]  
Shareholder Report [Line Items]  
Fund Name SA JPMorgan Equity-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 JPMorgan Equity-Income Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA JPMorgan Equity-Income Portfolio (Class 1)* $29 0.59%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 29 [247]
Expense Ratio, Percent 0.59% [247],[248]
Net Assets $ 829,000,000
Holdings Count | Holding 86
Advisory Fees Paid, Amount $ 2,300,000
Investment Company Portfolio Turnover 13.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $829M
Total number of portfolio holdings 86
Total net advisory fee paid $2.3M
Portfolio turnover rate during the reporting period 13%
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.
Top Industries*
Banks 12.7%
Diversified Financial Services 8.5%
Pharmaceuticals 8.0%
Retail 7.9%
Oil & Gas 5.9%
Electric 4.6%
Semiconductors 4.3%
Machinery-Diversified 3.5%
Aerospace/Defense 3.5%
Insurance 3.4%
Transportation 3.4%
Software 3.2%
REITS 3.0%
Computers 2.8%
Healthcare-Services 2.5%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000021958 [Member]  
Shareholder Report [Line Items]  
Fund Name SA JPMorgan Equity-Income
Class Name Class 2
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 JPMorgan Equity-Income Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA JPMorgan Equity-Income Portfolio (Class 2)* $37 0.74%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 37 [249]
Expense Ratio, Percent 0.74% [249],[250]
Net Assets $ 829,000,000
Holdings Count | Holding 86
Advisory Fees Paid, Amount $ 2,300,000
Investment Company Portfolio Turnover 13.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $829M
Total number of portfolio holdings 86
Total net advisory fee paid $2.3M
Portfolio turnover rate during the reporting period 13%
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.
Top Industries*
Banks 12.7%
Diversified Financial Services 8.5%
Pharmaceuticals 8.0%
Retail 7.9%
Oil & Gas 5.9%
Electric 4.6%
Semiconductors 4.3%
Machinery-Diversified 3.5%
Aerospace/Defense 3.5%
Insurance 3.4%
Transportation 3.4%
Software 3.2%
REITS 3.0%
Computers 2.8%
Healthcare-Services 2.5%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
C000021959 [Member]  
Shareholder Report [Line Items]  
Fund Name SA JPMorgan Equity-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 JPMorgan Equity-Income Portfolio (the “Portfolio”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Portfolio at corebridgefinancial.com/getprospectus. You can also request this information by contacting us at 1-800-448-2542.
Additional Information Phone Number 1-800-448-2542
Additional Information Website corebridgefinancial.com/getprospectus
Expenses [Text Block]
Fund Expenses
What were the Portfolio costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
SA JPMorgan Equity-Income Portfolio (Class 3)* $42 0.84%**
*
The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
**
Annualized
Expenses Paid, Amount $ 42 [251]
Expense Ratio, Percent 0.84% [251],[252]
Net Assets $ 829,000,000
Holdings Count | Holding 86
Advisory Fees Paid, Amount $ 2,300,000
Investment Company Portfolio Turnover 13.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics.
Net assets $829M
Total number of portfolio holdings 86
Total net advisory fee paid $2.3M
Portfolio turnover rate during the reporting period 13%
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.
Top Industries*
Banks 12.7%
Diversified Financial Services 8.5%
Pharmaceuticals 8.0%
Retail 7.9%
Oil & Gas 5.9%
Electric 4.6%
Semiconductors 4.3%
Machinery-Diversified 3.5%
Aerospace/Defense 3.5%
Insurance 3.4%
Transportation 3.4%
Software 3.2%
REITS 3.0%
Computers 2.8%
Healthcare-Services 2.5%
Portfolio Composition
Graphical Representation - Allocation 1 Chart
*   Percentages exclude derivatives (other than purchased options), if any.
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no disagreements with the accountants during the period.
[1] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[2] Annualized
[3] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[4] Annualized
[5] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[6] Annualized
[7] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[8] Annualized
[9] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[10] Annualized
[11] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[12] Annualized
[13] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[14] Annualized
[15] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[16] Annualized
[17] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[18] Annualized
[19] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[20] Annualized
[21] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[22] Annualized
[23] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[24] Annualized
[25] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[26] Annualized
[27] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[28] Annualized
[29] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[30] Annualized
[31] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[32] Annualized
[33] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[34] Annualized
[35] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[36] Annualized
[37] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[38] Annualized
[39] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[40] Annualized
[41] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[42] Annualized
[43] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[44] Annualized
[45] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[46] Annualized
[47] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[48] Annualized
[49] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[50] Annualized
[51] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[52] Annualized
[53] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[54] Annualized
[55] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[56] Annualized
[57] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[58] Annualized
[59] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[60] Annualized
[61] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[62] Annualized
[63] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[64] Annualized
[65] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[66] Annualized
[67] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[68] Annualized
[69] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[70] Annualized
[71] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio. 
[72] Annualized
[73] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[74] Annualized
[75] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[76] Annualized
[77] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[78] Annualized
[79] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[80] Annualized
[81] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[82] Annualized
[83] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[84] Annualized
[85] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[86] Annualized
[87] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[88] Annualized
[89] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[90] Annualized
[91] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[92] Annualized
[93] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[94] Annualized
[95] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio. 
[96] Annualized
[97] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio. 
[98] Annualized
[99] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[100] Annualized
[101] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[102] Annualized
[103] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[104] Annualized
[105] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[106] Annualized
[107] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[108] Annualized
[109] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[110] Annualized
[111] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio. 
[112] Annualized
[113] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[114] Annualized
[115] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[116] Annualized
[117] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[118] Annualized
[119] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[120] Annualized
[121] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[122] Annualized
[123] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[124] Annualized
[125] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[126] Annualized
[127] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[128] Annualized
[129] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[130] Annualized
[131] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[132] Annualized
[133] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[134] Annualized
[135] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[136] Annualized
[137] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[138] Annualized
[139] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[140] Annualized
[141] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[142] Annualized
[143] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[144] Annualized
[145] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[146] Annualized
[147] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[148] Annualized
[149] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[150] Annualized
[151] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[152] Annualized
[153] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[154] Annualized
[155] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[156] Annualized
[157] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[158] Annualized
[159] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[160] Annualized
[161] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[162] Annualized
[163] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[164] Annualized
[165] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[166] Annualized
[167] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[168] Annualized
[169] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[170] Annualized
[171] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[172] Annualized
[173] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[174] Annualized
[175] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio. 
[176] Annualized
[177] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[178] Annualized
[179] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[180] Annualized
[181] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[182] Annualized
[183] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[184] Annualized
[185] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[186] Annualized
[187] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[188] Annualized
[189] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[190] Annualized
[191] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[192] Annualized
[193] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[194] Annualized
[195] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[196] Annualized
[197] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[198] Annualized
[199] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[200] Annualized
[201] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[202] Annualized
[203] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[204] Annualized
[205] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[206] Annualized
[207] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[208] Annualized
[209] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[210] Annualized
[211] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio. 
[212] Annualized
[213] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[214] Annualized
[215] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[216] Annualized
[217] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio. 
[218] Annualized
[219] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[220] Annualized
[221] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[222] Annualized
[223] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[224] Annualized
[225] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[226] Annualized
[227] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[228] Annualized
[229] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[230] Annualized
[231] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[232] Annualized
[233] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[234] Annualized
[235] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[236] Annualized
[237] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[238] Annualized
[239] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[240] Annualized
[241] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[242] Annualized
[243] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[244] Annualized
[245] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[246] Annualized
[247] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[248] Annualized
[249] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[250] Annualized
[251] The expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any fees and expenses that may be charged by the variable annuity contracts and variable life insurance policies that invest in the Portfolio.
[252] Annualized