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SA AMERICAN CENTURY INFLATION PROTECTION PORTFOLIO  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading PORTFOLIO SUMMARY: SA AMERICAN CENTURY INFLATION PROTECTION PORTFOLIO (FORMERLY, SA WELLINGTON REAL RETURN PORTFOLIO)
Objective [Heading] rr_ObjectiveHeading Investment Goal
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The Portfolio’s investment goal is long-term total return using a strategy that seeks to protect against U.S. inflation.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Portfolio
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Portfolio. The table and the example below do not reflect the separate account fees charged in the variable annuity or variable life insurance policy (“Variable Contracts”) in which the Portfolio is offered. If separate account fees were shown, the Portfolio’s annual operating expenses would be higher. Please see your Variable Contract prospectus for more details on the separate account fees.
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Portfolio Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Portfolio pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in annual portfolio operating expenses or in the Example, affect the Portfolio’s performance. 
During the most recent fiscal year, the Portfolio’s portfolio turnover rate was 43% of the average value of its portfolio. 
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 43.00%
Expense Example [Heading] rr_ExpenseExampleHeading Expense Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
This Example is intended to help you compare the cost of investing in the Portfolio with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Portfolio for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Portfolio’s operating expenses remain the same. The Example does not reflect charges imposed by the Variable Contract. If the Variable Contract fees were reflected, the expenses would be higher. See the Variable Contract prospectus for information on such charges. Although your actual costs may be higher or lower, based on these assumptions and the net expenses shown in the fee table, your costs would be:
 
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies of the Portfolio
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Portfolio invests substantially all of its assets in investment-grade debt securities. To help protect against U.S. inflation, under normal conditions the Portfolio will invest over 50% of its assets in inflation-indexed debt securities. These securities include inflation-indexed U.S. Treasury securities, inflation-indexed securities issued by U.S. government agencies and instrumentalities other than the U.S. Treasury, and inflation-indexed securities issued by other entities such as U.S. and non-U.S. corporations and foreign governments. Inflation-indexed securities are designed to protect the future purchasing power of the money invested in them. The Portfolio also may invest in debt securities that are not inflation-indexed. Such investments could include other investment-grade debt securities (e.g., corporate bonds and notes), bank loans, commercial paper, and mortgage-backed and asset-backed securities, whether issued by the U.S. government, its agencies or instrumentalities, U.S. and non-U.S. corporations or other non‑governmental issuers, or foreign governments.
Securities issued by the U.S. Treasury and certain U.S. government agencies, such as the Government National Mortgage Association, are supported by the full faith and credit of the U.S. government. Securities issued by other U.S. government agencies, such as the Federal National Mortgage Association, the Federal Home Loan Mortgage Corporation, and the Federal Home Loan Bank are not guaranteed by the U.S. Treasury or supported by the full faith and credit of the U.S. government. However, these agencies are authorized to borrow from the U.S. Treasury to meet their obligations. Inflation-indexed securities issued by non‑U.S. government entities are backed only by the credit of the issuer.
The Portfolio also may invest in derivative instruments, provided that such instruments are in keeping with the Portfolio’s investment goal. For example, the Portfolio could use swap agreements to manage or reduce the risk of the effects of inflation with respect to the Portfolio’s position in non‑inflation‑indexed securities. The Portfolio also may enter into foreign currency exchange transactions for hedging purposes or to enhance returns. The Portfolio may also use when-issued and forward commitment transactions. The Portfolio may also invest in collateralized debt obligations (“CDOs”), including collateralized loan obligations, and other similarly structured investments.
The portfolio managers are not limited to a specific weighted average maturity range. However, the portfolio managers monitor the Portfolio’s weighted average maturity and seek to adjust it as appropriate, taking into account market conditions, the current inflation rate and other relevant factors.
Risk [Heading] rr_RiskHeading Principal Risks of Investing in the Portfolio
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
As with any mutual fund, there can be no assurance that the Portfolio’s investment goal will be met or that the net return on an investment in the Portfolio will exceed what could have been obtained through other investment or savings vehicles. Shares of the Portfolio are not bank deposits and are not guaranteed or insured by any bank, government entity or the Federal Deposit Insurance Corporation. If the value of the assets of the Portfolio goes down, you could lose money.
The following is a summary of the principal risks of investing in the Portfolio.
Risk of Investing in Bonds. The Portfolio invests significantly in bonds. As with any fund that invests significantly in bonds, the value of your investment in the Portfolio may go up or down in response to changes in interest rates or defaults (or even the potential for future default) by bond issuers. To the extent the Portfolio is invested in bonds, movements in the bond market generally may affect its performance. In addition, individual bonds selected for the Portfolio may underperform the market generally.
Risks of Investing in Inflation-Indexed Securities. Inflation-indexed securities are debt instruments whose principal is indexed to an official or designated measure of inflation, such as the Consumer Price Index in the United States. Inflation-indexed securities issued by a foreign government or foreign corporation are adjusted to reflect a comparable inflation index, calculated by that government. Inflation-indexed securities are sensitive to changes in the real interest rate, which is the nominal interest rate minus the expected rate of inflation. The price of an inflation-indexed security will increase if real interest rates decline, and decrease if real interest rates increase. If the interest rate rises for reasons other than inflation, the value of such instruments can be negatively impacted. Interest income will vary depending on changes to the principal amount of the security. For U.S. tax purposes, both interest payments and inflation adjustments to principal are treated as interest income subject to taxation when received or accrued, and inflation adjustments to principal are subject to taxation when the adjustment is made and not when the instrument matures.
Repayment of the original principal upon maturity (as adjusted for inflation) is guaranteed in the case of U.S. Treasury inflation-protected bonds (“TIPS”), even during a period of deflation. However, the current market value of a fixed income security is not guaranteed, and will fluctuate. Inflation-indexed securities, other than TIPS, may not provide a similar guarantee and may be supported only by the credit of the issuing entity. If a guarantee of principal is not provided, the adjusted principal value of the fixed income security repaid at maturity may be less than the original principal.
Inflation-indexed securities issued by corporations may be similar to TIPS, but are subject to the risk of the corporation’s inability to meet principal and interest payments on the obligation and may also be subject to price volatility due to such factors as interest rate sensitivity, market perception of the credit-worthiness of the issuer and general market liquidity. There are many different types of corporate bonds, and each bond issue has specific terms.
Interest Rate Fluctuations Risk. Fixed income securities may be subject to volatility due to changes in interest rates. Duration is a measure of interest rate risk that indicates how price-sensitive a bond is to changes in interest rates. Longer-term and lower coupon bonds tend to be more sensitive to changes in interest rates. Interest rates have been historically low, so the Portfolio faces a heightened risk that interest rates may rise. For example, a bond with a duration of three years will decrease in value by approximately 3% if interest rates increase by 1%. Potential future changes in monetary policy made by central banks and/or their governments are likely to affect the level of interest rates.
U.S. Government Obligations Risk. U.S. Treasury obligations are backed by the “full faith and credit” of the U.S. Government and generally have negligible credit risk. Securities issued or guaranteed by federal agencies or authorities and U.S. Government-sponsored instrumentalities or enterprises may or may not be backed by the full faith and credit of the U.S. Government.
Foreign Investment Risk. The Portfolio’s investments in the securities of foreign issuers or issuers with significant exposure to foreign markets involve additional risk. Foreign countries in which the Portfolio invests may have markets that are less liquid, less regulated and more volatile than U.S. markets. The value of the Portfolio’s investments may decline because of factors affecting the particular issuer as well as foreign markets and issuers generally, such as unfavorable government actions, and political or financial instability and other conditions or events (including, for example, military confrontations, war, terrorism, disease/virus, outbreaks and epidemics). Lack of information may also affect the value of these securities. The risks of foreign investments are heightened when investing in issuers in emerging market countries.
Mortgage- and Asset-Backed Securities Risk. Mortgage- and asset-backed securities represent interests in “pools” of mortgages or other assets, including consumer loans or receivables held in trust. The characteristics of these mortgage-backed and asset-backed securities differ from traditional fixed-income securities. Mortgage-backed securities are subject to prepayment risk (described below) and “extension risk.” Extension risk is the risk that, when interest rates rise, certain obligations will be paid off by the
obligor more slowly than anticipated, causing the value of these securities to fall. Small movements in interest rates (both increases and decreases) may quickly and significantly reduce the value of certain mortgage-backed securities. These securities also are subject to risk of default on the underlying mortgage, particularly during periods of economic downturn.
Risks of CDOs. The risks of an investment in a CDO depend largely on the quality and type of the collateral securities and the class of the CDO in which the Portfolio invests. In addition to being subject to the risks of securitized instruments generally, CDOs are also subject to additional risks, such as illiquidity risk; the risk that distributions from collateral securities will not be adequate to make interest or other payments; and the risk that the collateral may default, decline in value or be downgraded.
Bank Loan Risk. Bank loans are subject to the credit risk of nonpayment of principal or interest. Economic downturns or increases in interest rates may cause an increase in defaults, interest rate risk and illiquidity risk. Bank loans may or may not be collateralized at the time of acquisition, and any collateral may lack liquidity or lose all or substantially all of its value subsequent to investment. In the event of bankruptcy of a borrower, the Portfolio could experience delays or limitations with respect to its ability to realize the benefits of any collateral securing a bank loan.
Prepayment Risk. Prepayment risk is the possibility that the principal of the loans underlying mortgage-backed or other pass-through or fixed income securities may be prepaid at any time. As a general rule, prepayments increase during a period of falling interest rates and decrease during a period of rising interest rates. This can reduce the returns of the Portfolio because the Portfolio will have to reinvest that money at the lower prevailing interest rates. In periods of increasing interest rates, the occurrence of prepayments generally declines, with the effect that the securities subject to prepayment risk held by the Portfolio may exhibit price characteristics of longer-term debt securities.
Derivatives Risk. To the extent a derivative contract is used to hedge another position in the portfolio, the Portfolio will be exposed to the risks associated with hedging as described in the Glossary. To the extent a forward, futures contract or swap is used to enhance return, rather than as a hedge, the Portfolio will be directly exposed to the risks of the contract. Gains or losses from non‑hedging positions may be substantially greater than the cost of the position.
Hedging Risk. While hedging strategies can be very useful and inexpensive ways of reducing risk, they are sometimes ineffective due to unexpected changes in the market or exchange rates. Hedging also involves the risk that changes in the value of the related security will not match those of the
instruments being hedged as expected, in which case any losses on the instruments being hedged may not be reduced. For gross currency hedges, there is an additional risk, to the extent that these transactions create exposure to currencies in which the Portfolio’s securities are not denominated.
Credit Risk. Credit risk applies to most fixed income securities, but is generally not a factor for obligations backed by the “full faith and credit” of the U.S. Government. The Portfolio could lose money if the issuer of a fixed income security is unable or perceived to be unable to pay interest or to repay principal when it becomes due.
Settlement Risk. Investments purchased on an extended-settlement basis, such as when-issued, forward commitment or delayed-delivery transactions, involve a risk of loss if the value of the security to be purchased declines before the settlement date. Conversely, the sale of securities on an extended-settlement basis involves the risk that the value of the securities sold may increase before the settlement date.
Illiquidity Risk. When there is little or no active trading market for specific types of securities, it can become more difficult to sell the securities at or near their perceived value. In such a market, the value of such securities and the Portfolio’s share price may fall dramatically. To the extent that the Portfolio invests in non‑investment grade fixed income securities, it will be especially subject to the risk that during certain periods, the liquidity of particular issues or industries, or all securities within a particular investment category, will shrink or disappear suddenly and without warning as a result of adverse economic, market or political events or adverse investor perceptions whether or not accurate. Derivatives may also be subject to illiquidity risk.
Inflation Risk. Due to Internal Revenue Code provisions governing insurance product funds, no more than 55% of the Portfolio’s assets may be invested in securities issued by the same entity, such as the U.S. Treasury. Because the number of inflation-indexed debt securities issued by other entities is limited, the Portfolio may have a substantial position in non‑inflation‑indexed securities. To the extent that this is the case, that portion of the portfolio will not be automatically protected from inflation.
Affiliated Fund Rebalancing Risk. The Portfolio may be an investment option for other mutual funds for which SunAmerica Asset Management, LLC (“SunAmerica”) serves as investment adviser that are managed as “funds of funds.” From time to time, the Portfolio may experience relatively large redemptions or investments due to the rebalancing of a fund of funds. In the event of such redemptions or investments, the Portfolio could be required to sell securities or to invest cash at a time when it is not advantageous to do so.
Management Risk. The Portfolio is subject to management risk because it is an actively-managed investment portfolio. The Portfolio’s portfolio managers apply investment techniques and risk analyses in making investment decisions, but there can be no guarantee that these decisions or the individual securities selected by the portfolio managers will produce the desired results.
Market Risk. The Portfolio’s share price can fall because of weakness in the broad market, a particular industry, or specific holdings. The market as a whole can decline for many reasons, including adverse political or economic developments in the United States or abroad, changes in investor psychology, or heavy institutional selling and other conditions or events (including, for example, military confrontations, war, terrorism, disease/virus, outbreaks and epidemics). In addition, the adviser’s or a subadviser’s assessment of securities held in the Portfolio may prove incorrect, resulting in losses or poor performance even in a rising market.
The coronavirus pandemic and the related governmental and public responses have had and may continue to have an impact on the Portfolio’s investments and net asset value and have led and may continue to lead to increased market volatility and the potential for illiquidity in certain classes of securities and sectors of the market. Preventative or protective actions that governments may take in respect of pandemic or epidemic diseases may result in periods of business disruption, business closures, inability to obtain raw materials, supplies and component parts, and reduced or disrupted operations for the issuers in which the Portfolio invests. Government intervention in markets may impact interest rates, market volatility and security pricing. The occurrence, reoccurrence and pendency of such diseases could adversely affect the economies (including through changes in business activity and increased unemployment) and financial markets either in specific countries or worldwide.
Issuer Risk. The value of a security may decline for a number of reasons directly related to the issuer, such as management performance, financial leverage and reduced demand for the issuer’s goods and services.
Active Trading Risk. The Portfolio may engage in frequent trading of securities to achieve its investment goal. Active trading may result in high portfolio turnover and correspondingly greater brokerage commissions and other transaction costs, which will be borne directly by the Portfolio and could affect your performance.
Risk Lose Money [Text] rr_RiskLoseMoney If the value of the assets of the Portfolio goes down, you could lose money.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution Shares of the Portfolio are not bank deposits and are not guaranteed or insured by any bank, government entity or the Federal Deposit Insurance Corporation.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Information
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following bar chart illustrates the risks of investing in the Portfolio by showing changes in the Portfolio’s performance from calendar year to calendar year and the table compares the Portfolio’s average annual returns to those of the Bloomberg U.S. Treasury Inflation Protected Securities (TIPS) Index, the Bloomberg World Government Inflation-Linked 1‑10 Year Bond Index (Hedged to USD) and the Bloomberg 1‑10 Year U.S. Treasury Inflation Protected Securities (TIPS) Index. Effective February 22, 2022, the Portfolio changed its principal investment strategies and its benchmark indices against which the Portfolio measures its performance from the Bloomberg World Government Inflation-Linked 1‑10 Year Bond Index (Hedged to USD) and the Bloomberg 1‑10 Year U.S. Treasury Inflation Protected Securities (TIPS) Index to the Bloomberg U.S. Treasury Inflation Protected Securities (TIPS) Index. Portfolio management believes that the Bloomberg U.S. Treasury Inflation Protected Securities (TIPS) Index is more representative of the securities in which the Portfolio invests. Fees and expenses incurred at the contract level are not reflected in the bar chart or table. If these amounts were reflected, returns would be less than those shown. Of course, past performance is not necessarily an indication of how the Portfolio will perform in the future.
Effective February 22, 2022, American Century Investment Management, Inc. (“American Century”) assumed management of the Portfolio, which was previously managed by Wellington Management Company LLP. 
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following bar chart illustrates the risks of investing in the Portfolio by showing changes in the Portfolio’s performance from calendar year to calendar year and the table compares the Portfolio’s average annual returns to those of the Bloomberg U.S. Treasury Inflation Protected Securities (TIPS) Index, the Bloomberg World Government Inflation-Linked 1‑10 Year Bond Index (Hedged to USD) and the Bloomberg 1‑10 Year U.S. Treasury Inflation Protected Securities (TIPS) Index.
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Of course, past performance is not necessarily an indication of how the Portfolio will perform in the future.
Bar Chart [Heading] rr_BarChartHeading (Class 3 Shares) 
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads Fees and expenses incurred at the contract level are not reflected in the bar chart or table. If these amounts were reflected, returns would be less than those shown.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
During the period shown in the bar chart: 
Highest Quarterly Return:
      June 30, 2020        4.16%  
Lowest Quarterly Return:
      June 30, 2013        ‑4.86%  
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns (For the periods ended December 31, 2021)
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective February 22, 2022, the Portfolio changed its principal investment strategies and its benchmark indices against which the Portfolio measures its performance from the Bloomberg World Government Inflation-Linked 1‑10 Year Bond Index (Hedged to USD) and the Bloomberg 1‑10 Year U.S. Treasury Inflation Protected Securities (TIPS) Index to the Bloomberg U.S. Treasury Inflation Protected Securities (TIPS) Index. Portfolio management believes that the Bloomberg U.S. Treasury Inflation Protected Securities (TIPS) Index is more representative of the securities in which the Portfolio invests.
SA AMERICAN CENTURY INFLATION PROTECTION PORTFOLIO | Class 1  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.59%
Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.05%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 0.64%
1 Year rr_ExpenseExampleYear01 $ 65
3 Years rr_ExpenseExampleYear03 205
5 Years rr_ExpenseExampleYear05 357
10 Years rr_ExpenseExampleYear10 $ 798
1 Year rr_AverageAnnualReturnYear01 4.55%
5 Years rr_AverageAnnualReturnYear05 3.88%
10 Years rr_AverageAnnualReturnYear10
Since Inception rr_AverageAnnualReturnSinceInception 2.26%
Inception Date rr_AverageAnnualReturnInceptionDate Jan. 23, 2012
SA AMERICAN CENTURY INFLATION PROTECTION PORTFOLIO | Class 3  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.59%
Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.05%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 0.89%
1 Year rr_ExpenseExampleYear01 $ 91
3 Years rr_ExpenseExampleYear03 284
5 Years rr_ExpenseExampleYear05 493
10 Years rr_ExpenseExampleYear10 $ 1,096
2012 rr_AnnualReturn2012 3.76%
2013 rr_AnnualReturn2013 (5.23%)
2014 rr_AnnualReturn2014 1.66%
2015 rr_AnnualReturn2015 (1.35%)
2016 rr_AnnualReturn2016 3.66%
2017 rr_AnnualReturn2017 1.92%
2018 rr_AnnualReturn2018 (0.20%)
2019 rr_AnnualReturn2019 5.54%
2020 rr_AnnualReturn2020 6.78%
2021 rr_AnnualReturn2021 4.24%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Quarterly Return:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 4.16%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Quarterly Return:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Jun. 30, 2013
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (4.86%)
1 Year rr_AverageAnnualReturnYear01 4.24%
5 Years rr_AverageAnnualReturnYear05 3.62%
10 Years rr_AverageAnnualReturnYear10 2.02%
SA AMERICAN CENTURY INFLATION PROTECTION PORTFOLIO | Bloomberg U.S. Treasury Inflation Protected Securities (TIPS) Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 5.96%
5 Years rr_AverageAnnualReturnYear05 5.34%
10 Years rr_AverageAnnualReturnYear10 3.09%
Since Inception rr_AverageAnnualReturnSinceInception 3.08%
SA AMERICAN CENTURY INFLATION PROTECTION PORTFOLIO | Bloomberg 1-10 Year U.S Treasury Inflation Protected Securities (TIPS) Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 5.69%
5 Years rr_AverageAnnualReturnYear05 4.46%
10 Years rr_AverageAnnualReturnYear10 2.57%
Since Inception rr_AverageAnnualReturnSinceInception 2.54%
SA AMERICAN CENTURY INFLATION PROTECTION PORTFOLIO | Bloomberg World Government Inflation Linked 1-10 Year Bond Index (Hedged to USD) (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 5.65%
5 Years rr_AverageAnnualReturnYear05 4.14%
10 Years rr_AverageAnnualReturnYear10 2.80%
Since Inception rr_AverageAnnualReturnSinceInception 2.75%