| Form N-CSR Cover | 6 Months Ended |
| Jun. 30, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSRS |
| Amendment Flag | false |
| Registrant Name | SUNAMERICA SERIES TRUST |
| Entity Central Index Key | 0000892538 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Jun. 30, 2024 |
| Shareholder Report | 6 Months Ended | |
| Jun. 30, 2024 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 | Jun. 30, 2024 | |
| SA Wellington Strategic Multi-Asset Portfolio - Class 3 | ||
| Shareholder Report [Line Items] | ||
| Fund Name | SA Wellington StrategicMulti-Asset 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 Wellington Strategic Multi-Asset Portfolio (the “Portfolio”) for the period of January 1, 2024 to June 30, 2024. | |
| 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 | |
| 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 (Based on a hypothetical $10,000 investment) Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage SA Wellington Strategic Multi-Asset Portfolio (Class 3)* $54.95 1.06%** * The expenses shown in the table do not reflect any fees or expenses that may be charged by the Variable Contracts that invest in the Portfolio. ** Annualized | |
| Expenses Paid, Amount | $ 54.95 | [1] |
| Expense Ratio, Percent | 1.06% | [1],[2] |
| Net Assets | $ 168,000,000 | |
| Holdings Count | Holding | 684 | |
| Advisory Fees Paid, Amount | $ 500,000 | |
| Investment Company, Portfolio Turnover | 24% | |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net assets $ Total number of portfolio holdings 684 Total net advisory fee paid $ Portfolio turnover rate during the reporting period 24% | |
| 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 Foreign Government Obligations 15.8% U.S. Government & Agency Obligations 13.3% Internet 9.2% Semiconductors 6.8% Software 6.2% Banks 4.2% Pharmaceuticals 4.1% Computers 2.6% Diversified Financial Services 2.5% Short-Term Investments 2.4% Aerospace/Defense 2.4% Healthcare-Services 2.0% Commercial Services 1.9% Mining 1.8% Cosmetics/Personal Care 1.7% Portfolio Composition | |
| Accountant Change Disagreements [Text Block] | Changes in and Disagreements with Accountants There were no | |
| SA Wellington Strategic Multi-Asset Portfolio - Class 1 | ||
| Shareholder Report [Line Items] | ||
| Fund Name | SA Wellington StrategicMulti-Asset 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 Wellington Strategic Multi-Asset Portfolio (the “Portfolio”) for the period of January 1, 2024 to June 30, 2024. | |
| 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 | |
| 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 (Based on a hypothetical $10,000 investment) Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage SA Wellington Strategic Multi-Asset Portfolio (Class 1)* $42.03 0.81%** * The expenses shown in the table do not reflect any fees or expenses that may be charged by the Variable Contracts that invest in the Portfolio. ** Annualized | |
| Expenses Paid, Amount | $ 42.03 | [1] |
| Expense Ratio, Percent | 0.81% | [1],[2] |
| Net Assets | $ 168,000,000 | |
| Holdings Count | Holding | 684 | |
| Advisory Fees Paid, Amount | $ 500,000 | |
| Investment Company, Portfolio Turnover | 24% | |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net assets $ Total number of portfolio holdings 684 Total net advisory fee paid $ Portfolio turnover rate during the reporting period 24% | |
| 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 Foreign Government Obligations 15.8% U.S. Government & Agency Obligations 13.3% Internet 9.2% Semiconductors 6.8% Software 6.2% Banks 4.2% Pharmaceuticals 4.1% Computers 2.6% Diversified Financial Services 2.5% Short-Term Investments 2.4% Aerospace/Defense 2.4% Healthcare-Services 2.0% Commercial Services 1.9% Mining 1.8% Cosmetics/Personal Care 1.7% Portfolio Composition | |
| Accountant Change Disagreements [Text Block] | Changes in and Disagreements with Accountants There were no disagreements with the accountants | |
| SA Wellington Government and Quality Bond Portfolio - Class 3 | ||
| Shareholder Report [Line Items] | ||
| Fund Name | SA Wellington Governmentand Quality Bond 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 Wellington Government and Quality Bond Portfolio (the “Portfolio”) for the period of January 1, 2024 to June 30, 2024. | |
| 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 | |
| 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 Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage SA Wellington Government and Quality Bond Portfolio (Class 3)* $41.15 0.83%** * The expenses shown in the table do not reflect any fees or expenses that may be charged by the Variable Contracts that invest in the Portfolio. ** Annualized | |
| Expenses Paid, Amount | $ 41.15 | [1] |
| Expense Ratio, Percent | 0.83% | [1],[2] |
| Net Assets | $ 1,215,000,000 | |
| Holdings Count | Holding | 665 | |
| Advisory Fees Paid, Amount | $ 3,300,000 | |
| Investment Company, Portfolio Turnover | 56% | |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net assets $ Total number of portfolio holdings 665 Total net advisory fee paid $ Portfolio turnover rate during the reporting period 56% | |
| Holdings [Text Block] | Graphical Representation of Holdings The information below represents the composition of the Portfolio as of the end of the period. Portfolio Composition Credit Quality * * Amounts presented Moody's | |
| Accountant Change Disagreements [Text Block] | Changes in and Disagreements with Accountants There were no disagreements with the accountants during the period. | |
| SA Wellington Government and Quality Bond Portfolio - Class 2 | ||
| Shareholder Report [Line Items] | ||
| Fund Name | SA Wellington Governmentand Quality Bond 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 Wellington Government and Quality Bond Portfolio (the “Portfolio”) for the period of January 1, 2024 to June 30, 2024. | |
| 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 | |
| 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 Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage SA Wellington Government and Quality Bond Portfolio (Class 2)* $36.19 0.73%** * The expenses shown in the table do not reflect any fees or expenses that may be charged by the Variable Contracts that invest in the Portfolio. ** Annualized | |
| Expenses Paid, Amount | $ 36.19 | [1] |
| Expense Ratio, Percent | 0.73% | [1],[2] |
| Net Assets | $ 1,215,000,000 | |
| Holdings Count | Holding | 665 | |
| Advisory Fees Paid, Amount | $ 3,300,000 | |
| Investment Company, Portfolio Turnover | 56% | |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net assets $ Total number of portfolio holdings 665 Total net advisory fee paid $ Portfolio turnover rate during the reporting period 56% | |
| Holdings [Text Block] | Graphical Representation of Holdings The information below represents the composition of the Portfolio as of the end of the period. Portfolio Composition Credit Quality * * Amounts presented Moody's | |
| Accountant Change Disagreements [Text Block] | Changes in and Disagreements with Accountants There were no disagreements with the accountants during the period. | |
| SA Wellington Government and Quality Bond Portfolio - Class 1 | ||
| Shareholder Report [Line Items] | ||
| Fund Name | SA Wellington Governmentand Quality Bond 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 Wellington Government and Quality Bond Portfolio (the “Portfolio”) for the period of January 1, 2024 to June 30, 2024. | |
| 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 | |
| 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 Portfolio (Class) Costs of a $10,000 investment Costs paid as a percentage SA Wellington Government and Quality Bond Portfolio (Class 1)* $ 0.58%** * The expenses shown in the table do not reflect any fees or expenses that may be charged by the Variable Contracts that invest in the Portfolio. ** Annualized | |
| Expenses Paid, Amount | $ 28.77 | [1] |
| Expense Ratio, Percent | 0.58% | [1],[2] |
| Net Assets | $ 1,215,000,000 | |
| Holdings Count | Holding | 665 | |
| Advisory Fees Paid, Amount | $ 3,300,000 | |
| Investment Company, Portfolio Turnover | 56% | |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net assets $1,215M Total number of portfolio holdings 665 Total net advisory fee paid $3.3M Portfolio turnover rate during the reporting period 56% | |
| Holdings [Text Block] | Graphical Representation of Holdings The information below represents the composition of the Portfolio as of the end of the period. Portfolio Composition Credit Quality * * Amounts presented exclude short-term securities. The ratings source is Moody's | |
| Accountant Change Disagreements [Text Block] | Changes in and Disagreements with Accountants There were no disagreements with the accountants during the period. | |
| SA Wellington Capital Appreciation Portfolio - Class 3 | ||
| Shareholder Report [Line Items] | ||
| Fund Name | SA Wellington CapitalAppreciation 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 Wellington Capital Appreciation Portfolio (the “Portfolio”) for the period of January 1, 2024 to June 30, 2024. | |
| 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 | |
| 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 SA Wellington Capital Appreciation Portfolio (Class 3)* $54.73 0.97%** * The expenses shown in the table do not reflect any fees or expenses that may be charged by the Variable Contracts that invest in the Portfolio. ** Annualized | |
| Expenses Paid, Amount | $ 54.73 | [1] |
| Expense Ratio, Percent | 0.97% | [1],[2] |
| Net Assets | $ 2,154,000,000 | |
| Holdings Count | Holding | 55 | |
| Advisory Fees Paid, Amount | $ 7,200,000 | |
| Investment Company, Portfolio Turnover | 72% | |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net assets $2,154M Total number of portfolio holdings 55 Total net advisory fee paid $7.2M Portfolio turnover rate during the reporting period 72% | |
| 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 24.1% Semiconductors 22.2% Computers 15.2% Software 7.7% Pharmaceuticals 6.0% Healthcare-Products 3.9% Entertainment 2.2% Telecommunications 2.2% Diversified Financial Services 2.1% Leisure Time 1.8% Media 1.6% Apparel 1.2% Cosmetics/Personal Care 1.2% Miscellaneous Manufacturing 1.2% Distribution/Wholesale 1.1% Portfolio Composition | |
| Accountant Change Disagreements [Text Block] | Changes in and Disagreements with Accountants There were no disagreements with the accountants during the period. | |
| SA Wellington Capital Appreciation Portfolio - Class 2 | ||
| Shareholder Report [Line Items] | ||
| Fund Name | SA Wellington CapitalAppreciation 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 Wellington Capital Appreciation Portfolio (the “Portfolio”) for the period of January 1, 2024 to June 30, 2024. | |
| 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 | |
| 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 SA Wellington Capital Appreciation Portfolio (Class 2)* $49.10 0.87%** * The expenses shown in the table do not reflect any fees or expenses that may be charged by the Variable Contracts that invest in the Portfolio. ** Annualized | |
| Expenses Paid, Amount | $ 49.1 | [1] |
| Expense Ratio, Percent | 0.87% | [1],[2] |
| Net Assets | $ 2,154,000,000 | |
| Holdings Count | Holding | 55 | |
| Advisory Fees Paid, Amount | $ 7,200,000 | |
| Investment Company, Portfolio Turnover | 72% | |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net assets $2,154M Total number of portfolio holdings 55 Total net advisory fee paid $7.2M Portfolio turnover rate during the reporting period 72% | |
| Holdings [Text Block] | Graphical Representation of Holdings The information below represents the composition of the Portfolio's net assets Top Industries Internet 24.1% Semiconductors 22.2% Computers 15.2% Software 7.7% Pharmaceuticals 6.0% Healthcare-Products 3.9% Entertainment 2.2% Telecommunications 2.2% Diversified Financial Services 2.1% Leisure Time 1.8% Media 1.6% Apparel 1.2% Cosmetics/Personal Care 1.2% Miscellaneous Manufacturing 1.2% Distribution/Wholesale 1.1% Portfolio Composition | |
| Accountant Change Disagreements [Text Block] | Changes in and Disagreements with Accountants There were no disagreements with the accountants during the period. | |
| SA Wellington Capital Appreciation Portfolio - Class 1 | ||
| Shareholder Report [Line Items] | ||
| Fund Name | SA Wellington CapitalAppreciation 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 Wellington Capital Appreciation Portfolio (the “Portfolio”) for the period of January 1, 2024 to June 30, 2024. | |
| 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 | |
| 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 SA Wellington Capital Appreciation Portfolio (Class 1)* $40.65 0.72%** * The expenses shown in the table do not reflect any fees or expenses that may be charged by the Variable Contracts that invest in the Portfolio. ** Annualized | |
| Expenses Paid, Amount | $ 40.65 | [1] |
| Expense Ratio, Percent | 0.72% | [1],[2] |
| Net Assets | $ 2,154,000,000 | |
| Holdings Count | Holding | 55 | |
| Advisory Fees Paid, Amount | $ 7,200,000 | |
| Investment Company, Portfolio Turnover | 72% | |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net assets $2,154M Total number of portfolio holdings 55 Total net advisory fee paid $7.2M Portfolio turnover rate during the reporting period 72% | |
| Holdings [Text Block] | Graphical Representation of Holdings The information below represents the composition of the Portfolio's net assets Top Industries Internet 24.1% Semiconductors 22.2% Computers 15.2% Software 7.7% Pharmaceuticals 6.0% Healthcare-Products 3.9% Entertainment 2.2% Telecommunications 2.2% Diversified Financial Services 2.1% Leisure Time 1.8% Media 1.6% Apparel 1.2% Cosmetics/Personal Care 1.2% Miscellaneous Manufacturing 1.2% Distribution/Wholesale 1.1% Portfolio Composition | |
| 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 do not reflect any fees or expenses that may be charged by the Variable Contracts that invest in the Portfolio.[2]Annualized | ||
| Shareholder Report, Holdings (Details) | Jun. 30, 2024 | |
| SA Wellington Strategic Multi-Asset Portfolio - Class 3 | Foreign Government Obligation [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 15.80% | |
| SA Wellington Strategic Multi-Asset Portfolio - Class 3 | U S Government and Agency Obligation [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 13.30% | |
| SA Wellington Strategic Multi-Asset Portfolio - Class 3 | Internet [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 9.20% | |
| SA Wellington Strategic Multi-Asset Portfolio - Class 3 | Semiconductors [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 6.80% | |
| SA Wellington Strategic Multi-Asset Portfolio - Class 3 | Software [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 6.20% | |
| SA Wellington Strategic Multi-Asset Portfolio - Class 3 | Banks [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 4.20% | |
| SA Wellington Strategic Multi-Asset Portfolio - Class 3 | Pharmaceuticals [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 4.10% | |
| SA Wellington Strategic Multi-Asset Portfolio - Class 3 | Computer [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2.60% | |
| SA Wellington Strategic Multi-Asset Portfolio - Class 3 | Financial Services Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2.50% | |
| SA Wellington Strategic Multi-Asset Portfolio - Class 3 | Short Term Investments Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2.40% | |
| SA Wellington Strategic Multi-Asset Portfolio - Class 3 | Aerospace Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2.40% | |
| SA Wellington Strategic Multi-Asset Portfolio - Class 3 | Healthcare Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2% | |
| SA Wellington Strategic Multi-Asset Portfolio - Class 3 | Commercial and Industrial Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.90% | |
| SA Wellington Strategic Multi-Asset Portfolio - Class 3 | Mining [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.80% | |
| SA Wellington Strategic Multi-Asset Portfolio - Class 3 | Cosmetics Personal Care [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.70% | |
| SA Wellington Strategic Multi-Asset Portfolio - Class 3 | Common Stock [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 65.50% | |
| SA Wellington Strategic Multi-Asset Portfolio - Class 3 | Foreign Government Obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 15.80% | |
| SA Wellington Strategic Multi-Asset Portfolio - Class 3 | U S Government and Agency Obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 13.30% | |
| SA Wellington Strategic Multi-Asset Portfolio - Class 3 | Short Term Investment [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2.40% | |
| SA Wellington Strategic Multi-Asset Portfolio - Class 3 | Corporate Bonds & Notes [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.80% | |
| SA Wellington Strategic Multi-Asset Portfolio - Class 3 | Repurchase Agreements [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.40% | |
| SA Wellington Strategic Multi-Asset Portfolio - Class 3 | Other assets less liabilities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | (0.20%) | |
| SA Wellington Strategic Multi-Asset Portfolio - Class 1 | Foreign Government Obligation [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 15.80% | |
| SA Wellington Strategic Multi-Asset Portfolio - Class 1 | U S Government and Agency Obligation [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 13.30% | |
| SA Wellington Strategic Multi-Asset Portfolio - Class 1 | Internet [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 9.20% | |
| SA Wellington Strategic Multi-Asset Portfolio - Class 1 | Semiconductors [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 6.80% | |
| SA Wellington Strategic Multi-Asset Portfolio - Class 1 | Software [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 6.20% | |
| SA Wellington Strategic Multi-Asset Portfolio - Class 1 | Banks [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 4.20% | |
| SA Wellington Strategic Multi-Asset Portfolio - Class 1 | Pharmaceuticals [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 4.10% | |
| SA Wellington Strategic Multi-Asset Portfolio - Class 1 | Computer [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2.60% | |
| SA Wellington Strategic Multi-Asset Portfolio - Class 1 | Financial Services Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2.50% | |
| SA Wellington Strategic Multi-Asset Portfolio - Class 1 | Short Term Investments Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2.40% | |
| SA Wellington Strategic Multi-Asset Portfolio - Class 1 | Aerospace Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2.40% | |
| SA Wellington Strategic Multi-Asset Portfolio - Class 1 | Healthcare Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2% | |
| SA Wellington Strategic Multi-Asset Portfolio - Class 1 | Commercial and Industrial Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.90% | |
| SA Wellington Strategic Multi-Asset Portfolio - Class 1 | Mining [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.80% | |
| SA Wellington Strategic Multi-Asset Portfolio - Class 1 | Cosmetics Personal Care [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.70% | |
| SA Wellington Strategic Multi-Asset Portfolio - Class 1 | Common Stock [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 65.50% | |
| SA Wellington Strategic Multi-Asset Portfolio - Class 1 | Foreign Government Obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 15.80% | |
| SA Wellington Strategic Multi-Asset Portfolio - Class 1 | U S Government and Agency Obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 13.30% | |
| SA Wellington Strategic Multi-Asset Portfolio - Class 1 | Short Term Investment [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2.40% | |
| SA Wellington Strategic Multi-Asset Portfolio - Class 1 | Corporate Bonds & Notes [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.80% | |
| SA Wellington Strategic Multi-Asset Portfolio - Class 1 | Repurchase Agreements [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.40% | |
| SA Wellington Strategic Multi-Asset Portfolio - Class 1 | Other assets less liabilities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | (0.20%) | |
| SA Wellington Government and Quality Bond Portfolio - Class 3 | Moody's, Aaa Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 79.40% | [1] |
| SA Wellington Government and Quality Bond Portfolio - Class 3 | Moody's, Aa1 Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 2.60% | [1] |
| SA Wellington Government and Quality Bond Portfolio - Class 3 | Moody's, A1 Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 12.40% | [1] |
| SA Wellington Government and Quality Bond Portfolio - Class 3 | Moody's, Baa1 Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 1.20% | [1] |
| SA Wellington Government and Quality Bond Portfolio - Class 3 | Not Rated [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 4.40% | [1] |
| SA Wellington Government and Quality Bond Portfolio - Class 3 | Foreign Government Obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.50% | |
| SA Wellington Government and Quality Bond Portfolio - Class 3 | U S Government and Agency Obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 70.80% | |
| SA Wellington Government and Quality Bond Portfolio - Class 3 | Corporate Bonds & Notes [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 16.10% | |
| SA Wellington Government and Quality Bond Portfolio - Class 3 | Repurchase Agreements [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2.20% | |
| SA Wellington Government and Quality Bond Portfolio - Class 3 | Other assets less liabilities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | (0.80%) | |
| SA Wellington Government and Quality Bond Portfolio - Class 3 | Asset-Backed Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 5.10% | |
| SA Wellington Government and Quality Bond Portfolio - Class 3 | Collateralized Mortgage Obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 4% | |
| SA Wellington Government and Quality Bond Portfolio - Class 3 | Municipal Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2.10% | |
| SA Wellington Government and Quality Bond Portfolio - Class 2 | Moody's, Aaa Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 79.40% | [1] |
| SA Wellington Government and Quality Bond Portfolio - Class 2 | Moody's, Aa1 Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 2.60% | [1] |
| SA Wellington Government and Quality Bond Portfolio - Class 2 | Moody's, A1 Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 12.40% | [1] |
| SA Wellington Government and Quality Bond Portfolio - Class 2 | Moody's, Baa1 Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 1.20% | [1] |
| SA Wellington Government and Quality Bond Portfolio - Class 2 | Not Rated [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 4.40% | [1] |
| SA Wellington Government and Quality Bond Portfolio - Class 2 | Foreign Government Obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.50% | |
| SA Wellington Government and Quality Bond Portfolio - Class 2 | U S Government and Agency Obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 70.80% | |
| SA Wellington Government and Quality Bond Portfolio - Class 2 | Corporate Bonds & Notes [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 16.10% | |
| SA Wellington Government and Quality Bond Portfolio - Class 2 | Repurchase Agreements [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2.20% | |
| SA Wellington Government and Quality Bond Portfolio - Class 2 | Other assets less liabilities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | (0.80%) | |
| SA Wellington Government and Quality Bond Portfolio - Class 2 | Asset-Backed Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 5.10% | |
| SA Wellington Government and Quality Bond Portfolio - Class 2 | Collateralized Mortgage Obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 4% | |
| SA Wellington Government and Quality Bond Portfolio - Class 2 | Municipal Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2.10% | |
| SA Wellington Government and Quality Bond Portfolio - Class 1 | Moody's, Aaa Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 79.40% | [1] |
| SA Wellington Government and Quality Bond Portfolio - Class 1 | Moody's, Aa1 Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 2.60% | [1] |
| SA Wellington Government and Quality Bond Portfolio - Class 1 | Moody's, A1 Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 12.40% | [1] |
| SA Wellington Government and Quality Bond Portfolio - Class 1 | Moody's, Baa1 Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 1.20% | [1] |
| SA Wellington Government and Quality Bond Portfolio - Class 1 | Not Rated [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 4.40% | [1] |
| SA Wellington Government and Quality Bond Portfolio - Class 1 | Foreign Government Obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.50% | |
| SA Wellington Government and Quality Bond Portfolio - Class 1 | U S Government and Agency Obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 70.80% | |
| SA Wellington Government and Quality Bond Portfolio - Class 1 | Corporate Bonds & Notes [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 16.10% | |
| SA Wellington Government and Quality Bond Portfolio - Class 1 | Repurchase Agreements [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2.20% | |
| SA Wellington Government and Quality Bond Portfolio - Class 1 | Other assets less liabilities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | (0.80%) | |
| SA Wellington Government and Quality Bond Portfolio - Class 1 | Asset-Backed Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 5.10% | |
| SA Wellington Government and Quality Bond Portfolio - Class 1 | Collateralized Mortgage Obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 4% | |
| SA Wellington Government and Quality Bond Portfolio - Class 1 | Municipal Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2.10% | |
| SA Wellington Capital Appreciation Portfolio - Class 3 | Internet [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 24.10% | |
| SA Wellington Capital Appreciation Portfolio - Class 3 | Semiconductors [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 22.20% | |
| SA Wellington Capital Appreciation Portfolio - Class 3 | Software [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 7.70% | |
| SA Wellington Capital Appreciation Portfolio - Class 3 | Pharmaceuticals [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 6% | |
| SA Wellington Capital Appreciation Portfolio - Class 3 | Computer [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 15.20% | |
| SA Wellington Capital Appreciation Portfolio - Class 3 | Financial Services Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2.10% | |
| SA Wellington Capital Appreciation Portfolio - Class 3 | Healthcare Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 3.90% | |
| SA Wellington Capital Appreciation Portfolio - Class 3 | Cosmetics Personal Care [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.20% | |
| SA Wellington Capital Appreciation Portfolio - Class 3 | Entertainment Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2.20% | |
| SA Wellington Capital Appreciation Portfolio - Class 3 | Communications Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2.20% | |
| SA Wellington Capital Appreciation Portfolio - Class 3 | Leisure Time [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.80% | |
| SA Wellington Capital Appreciation Portfolio - Class 3 | Media [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.60% | |
| SA Wellington Capital Appreciation Portfolio - Class 3 | Apparel [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.20% | |
| SA Wellington Capital Appreciation Portfolio - Class 3 | Miscellaneous Manufacturing [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.20% | |
| SA Wellington Capital Appreciation Portfolio - Class 3 | Distribution Wholesale [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.10% | |
| SA Wellington Capital Appreciation Portfolio - Class 3 | Common Stock [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 101.50% | |
| SA Wellington Capital Appreciation Portfolio - Class 3 | Repurchase Agreements [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.70% | |
| SA Wellington Capital Appreciation Portfolio - Class 3 | Other assets less liabilities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | (2.20%) | |
| SA Wellington Capital Appreciation Portfolio - Class 2 | Internet [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 24.10% | |
| SA Wellington Capital Appreciation Portfolio - Class 2 | Semiconductors [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 22.20% | |
| SA Wellington Capital Appreciation Portfolio - Class 2 | Software [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 7.70% | |
| SA Wellington Capital Appreciation Portfolio - Class 2 | Pharmaceuticals [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 6% | |
| SA Wellington Capital Appreciation Portfolio - Class 2 | Computer [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 15.20% | |
| SA Wellington Capital Appreciation Portfolio - Class 2 | Financial Services Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2.10% | |
| SA Wellington Capital Appreciation Portfolio - Class 2 | Healthcare Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 3.90% | |
| SA Wellington Capital Appreciation Portfolio - Class 2 | Cosmetics Personal Care [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.20% | |
| SA Wellington Capital Appreciation Portfolio - Class 2 | Entertainment Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2.20% | |
| SA Wellington Capital Appreciation Portfolio - Class 2 | Communications Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2.20% | |
| SA Wellington Capital Appreciation Portfolio - Class 2 | Leisure Time [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.80% | |
| SA Wellington Capital Appreciation Portfolio - Class 2 | Media [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.60% | |
| SA Wellington Capital Appreciation Portfolio - Class 2 | Apparel [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.20% | |
| SA Wellington Capital Appreciation Portfolio - Class 2 | Miscellaneous Manufacturing [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.20% | |
| SA Wellington Capital Appreciation Portfolio - Class 2 | Distribution Wholesale [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.10% | |
| SA Wellington Capital Appreciation Portfolio - Class 2 | Common Stock [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 101.50% | |
| SA Wellington Capital Appreciation Portfolio - Class 2 | Repurchase Agreements [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.70% | |
| SA Wellington Capital Appreciation Portfolio - Class 2 | Other assets less liabilities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | (2.20%) | |
| SA Wellington Capital Appreciation Portfolio - Class 1 | Internet [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 24.10% | |
| SA Wellington Capital Appreciation Portfolio - Class 1 | Semiconductors [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 22.20% | |
| SA Wellington Capital Appreciation Portfolio - Class 1 | Software [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 7.70% | |
| SA Wellington Capital Appreciation Portfolio - Class 1 | Pharmaceuticals [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 6% | |
| SA Wellington Capital Appreciation Portfolio - Class 1 | Computer [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 15.20% | |
| SA Wellington Capital Appreciation Portfolio - Class 1 | Financial Services Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2.10% | |
| SA Wellington Capital Appreciation Portfolio - Class 1 | Healthcare Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 3.90% | |
| SA Wellington Capital Appreciation Portfolio - Class 1 | Cosmetics Personal Care [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.20% | |
| SA Wellington Capital Appreciation Portfolio - Class 1 | Entertainment Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2.20% | |
| SA Wellington Capital Appreciation Portfolio - Class 1 | Communications Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2.20% | |
| SA Wellington Capital Appreciation Portfolio - Class 1 | Leisure Time [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.80% | |
| SA Wellington Capital Appreciation Portfolio - Class 1 | Media [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.60% | |
| SA Wellington Capital Appreciation Portfolio - Class 1 | Apparel [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.20% | |
| SA Wellington Capital Appreciation Portfolio - Class 1 | Miscellaneous Manufacturing [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.20% | |
| SA Wellington Capital Appreciation Portfolio - Class 1 | Distribution Wholesale [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.10% | |
| SA Wellington Capital Appreciation Portfolio - Class 1 | Common Stock [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 101.50% | |
| SA Wellington Capital Appreciation Portfolio - Class 1 | Repurchase Agreements [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.70% | |
| SA Wellington Capital Appreciation Portfolio - Class 1 | Other assets less liabilities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | (2.20%) | |
| [1]Amounts presented exclude short-term securities. The ratings source is Moody's. | ||
