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SA Multi-Managed Moderate Growth Portfolio  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading SA Multi-Managed Moderate Growth Portfolio
Objective [Heading] rr_ObjectiveHeading Investment Goal
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The Portfolio’s investment goal is long-term growth of capital,
Objective, Secondary [Text Block] rr_ObjectiveSecondaryTextBlock
with capital preservation as a secondary objective.
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 and hold shares of the Portfolio. The Portfolio’s annual operating expenses 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)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination Jul. 31, 2021
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 84% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 84.00%
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 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 and that all fee waivers and/or reimbursements remain in place through the term of the applicable waiver and/or expense reimbursement. 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 attempts to achieve its investment goal by allocating its assets among three distinct, actively-managed investment components (the “Managed Components”), each with a different investment strategy. The Managed Components include a small-cap growth component, a fixed income component and a growth component.

The Managed Components each invest to varying degrees, according to its investment strategy, in a diverse portfolio of securities including, but not limited to, common stocks, securities with equity characteristics (such as preferred stocks, warrants or fixed income securities convertible into common stock), corporate and U.S. Government fixed income securities, money market instruments and/or cash or cash equivalents.

The target allocation of the Portfolio’s assets among the components is as follows:

• Small-Cap Growth Component 18.0%
• Fixed Income Component 41.4%
• Growth Component 40.6%

Differences in investment returns among the Managed Components will cause the actual percentages to vary over the course of a calendar quarter from the target allocations referenced above. Accordingly, the Portfolio’s assets will be reallocated or “rebalanced” among the Managed Components on at least a quarterly basis to restore the target allocations for the Portfolio.

The Small-Cap Growth Component invests principally in equity securities, including those of lesser known or high growth companies or industries, such as technology, telecommunications, media, healthcare, energy, real estate investment trusts and consumer cyclicals. Although the component’s investments will primarily be in small-capitalization companies, the component may invest substantially in mid-capitalization companies and, to a smaller degree, large-capitalization companies.

As noted above, approximately 41.4% of the Portfolio’s assets will be allocated to the Fixed Income Component, which, under normal circumstances, invests primarily in investment grade fixed income securities (U.S. or foreign). The component may also invest substantially in short-term investments, foreign securities (including securities denominated in foreign currencies), asset-backed and mortgage-backed securities and when-issued and delayed-delivery securities.

Under normal market conditions, the subadviser for the Growth Component invests primarily in established companies with capitalizations within the range of companies included in the Russell 1000® Growth Index. As of May 31, 2020, the market capitalization range of the companies in the Russell 1000® Growth Index was between approximately $581 million and $1.4 trillion. The subadviser for the Growth Component emphasizes a bottom-up stock selection process, seeking attractive investments on an individual company basis. In selecting securities for investment, the subadviser for the Growth Component typically invests in companies it believes have strong name recognition and sustainable competitive advantages with above average business visibility, the ability to deploy capital at high rates of return, strong balance sheets and an attractive risk/reward.

The subadviser for the Growth Component generally considers selling a portfolio holding when it determines that the holding no longer satisfies its investment criteria. The Growth Component may invest in foreign securities, which may include emerging market securities. The Growth Component may invest in equity securities.

The subadviser for the Growth Component actively integrates sustainability into the investment process by using environmental, social and governance (“ESG”) factors as a lens for additional fundamental research, which can contribute to investment decision-making. The subadviser for the Growth Component seeks to understand how environmental and social initiatives within companies can create value by strengthening durable competitive advantages, creating growth opportunities, driving profitability and/or aligning with secular growth trends. The subadviser for the Growth Component generally engages with company management teams to discuss their ESG practices, with the aim of identifying how sustainability themes present opportunities and risks that can be material to the value of the security over the long term. Other aspects of the investment process include a proprietary, systematic evaluation of governance policies, specifically focusing on compensation alignment on long-term value creation. The subadviser for the Growth Component does not treat ESG as a deterministic, reductive screen, nor as a portfolio construction tool layered on top of a passive vehicle.
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.

Equity Securities Risk. The Portfolio invests principally in equity securities and is therefore subject to the risk that stock prices will fall and may underperform other asset classes. Individual stock prices fluctuate from day-to-day and may decline significantly.

Large-Cap Companies Risk. Large-cap companies tend to be less volatile than companies with smaller market capitalizations. In exchange for this potentially lower risk, the Portfolio’s value may not rise as much as the value of portfolios that emphasize smaller companies.

Growth Stock Risk. Growth stocks may lack the dividend yield associated with value stocks that can cushion total return in a bear market. Also, growth stocks normally carry a higher price/earnings ratio than many other stocks. Consequently, if earnings expectations are not met, the market price of growth stocks will often decline more than other stocks.

Risk of Investing 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 defaults) by bond issuers.

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.

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.

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.

Currency Volatility Risk. The value of the Portfolio’s foreign investments may fluctuate due to changes in currency exchange rates. A decline in the value of foreign currencies relative to the U.S. dollar generally can be expected to depress the value of the Portfolio’s non-U.S. dollar-denominated securities.

Mortgage- and Asset-Backed Securities Risk. The characteristics of mortgage-backed and asset-backed securities differ from traditional fixed income securities. Mortgage-backed securities are subject to “prepayment risk” and “extension risk.” Prepayment risk is the risk that, when interest rates fall, certain types of obligations will be paid off by the obligor more quickly than originally anticipated and the Portfolio may have to invest the proceeds in securities with lower yields. 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 and asset-backed securities. Mortgage-backed and asset-backed securities are also subject to credit risk.

Small- and Mid-Cap Companies Risk. Securities of small- and mid-cap companies are usually more volatile and entail greater risks than securities of large-cap companies.

Affiliated Fund Rebalancing Risk. The Portfolio may be an investment option for other mutual funds for which 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.

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.

Real Estate Industry Risk. These risks include declines in the value of real estate, risks related to general and local economic conditions, overbuilding and increased competition, increases in property taxes and operating expenses, changes in zoning laws, casualty or condemnation losses, fluctuations in rental income, changes in neighborhood values, changes in the appeal of properties to tenants and increases in interest rates. If the Portfolio has rental income or income from the disposition of real property, the receipt of such income may adversely affect its ability to retain its tax status as a regulated investment company.

When-Issued and Delayed Delivery Transactions Risk. When-issued and delayed delivery securities involve the risk that the security the Portfolio buys will lose value prior to its delivery. There also is the risk that the security will not be issued or that the other party to the transaction will not meet its obligation. If this occurs, the Portfolio may lose both the investment opportunity for the assets it set aside to pay for the security and any gain in the security’s price.
Risk Lose Money [Text] rr_RiskLoseMoney If the value of the assets of the Portfolio goes down, you could lose money.
RIsk Not Insured [Text] rr_RiskNotInsured 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 S&P 500® Index, the Russell 1000® Growth Index and a blended index and each of its components. The blended index consists of 37.9% Russell 1000® Index, 42.3% Bloomberg Barclays U.S. Aggregate Bond Index, 18.0% Russell 2000® Index and 1.8% FTSE Treasury Bill 3-Month Index (the “Blended Index”). 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 May 1, 2019, Morgan Stanley Investment Management Inc. (“MSIM”) assumed management of the Growth Component of the Portfolio, which was previously managed by Janus Capital Management LLC. Effective October 24, 2014, the subadvisory agreement between SunAmerica and Lord Abbett & Co. LLC and the subadvisory agreement between SunAmerica and PineBridge Investments LLC were terminated with respect to the Portfolio.
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 S&P 500® Index, the Russell 1000® Growth Index and a blended index and each of its components.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The blended index consists of 37.9% Russell 1000® Index, 42.3% Bloomberg Barclays U.S. Aggregate Bond Index, 18.0% Russell 2000® Index and 1.8% FTSE Treasury Bill 3-Month Index (the “Blended 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 1 Shares)
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
During the 10-year period shown in the bar chart, the highest return for a quarter was 10.45% (quarter ended March 31, 2012) and the lowest return for a quarter was -11.10% (quarter ended September 30, 2011). The year-to-date calendar return as of June 30, 2020 was 14.65%.
Year to Date Return, Label rr_YearToDateReturnLabel The year-to-date calendar return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Jun. 30, 2020
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 14.65%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2012
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 10.45%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2011
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (11.10%)
Average Annual Return, Caption rr_AverageAnnualReturnCaption Average Annual Total Returns (For the periods ended December 31, 2019)
SA Multi-Managed Moderate Growth Portfolio | Blended Index  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 20.17%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 7.37%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 9.09%
SA Multi-Managed Moderate Growth Portfolio | Bloomberg Barclays U.S. Aggregate Bond Index  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 8.72%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 3.05%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 3.75%
SA Multi-Managed Moderate Growth Portfolio | FTSE Treasury Bill 3-Month Index  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 2.25%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 1.05%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 0.56%
SA Multi-Managed Moderate Growth Portfolio | Russell 1000® Index  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 31.43%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 11.48%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 13.54%
SA Multi-Managed Moderate Growth Portfolio | Russell 1000® Growth Index  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 36.39%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 14.63%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 15.22%
SA Multi-Managed Moderate Growth Portfolio | Russell 2000® Index  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 25.52%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 8.23%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 11.83%
SA Multi-Managed Moderate Growth Portfolio | S&P 500® Index  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 31.49%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 11.70%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 13.56%
SA Multi-Managed Moderate Growth Portfolio | Class 1  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.85%
Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.32%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 1.17%
Fee Waivers and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.05%) [1]
Total Annual Portfolio Operating Expenses After Fee Waivers and/or Expense Reimbursements rr_NetExpensesOverAssets 1.12% [1]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 114
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 367
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 639
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,416
Annual Return 2010 rr_AnnualReturn2010 11.20%
Annual Return 2011 rr_AnnualReturn2011 (1.72%)
Annual Return 2012 rr_AnnualReturn2012 12.02%
Annual Return 2013 rr_AnnualReturn2013 16.88%
Annual Return 2014 rr_AnnualReturn2014 8.69%
Annual Return 2015 rr_AnnualReturn2015 1.37%
Annual Return 2016 rr_AnnualReturn2016 6.11%
Annual Return 2017 rr_AnnualReturn2017 13.77%
Annual Return 2018 rr_AnnualReturn2018 (3.53%)
Annual Return 2019 rr_AnnualReturn2019 18.18%
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 18.18%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 6.89%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 8.05%
SA Multi-Managed Moderate Growth Portfolio | Class 2  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.85%
Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.15%
Other Expenses rr_OtherExpensesOverAssets 0.32%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 1.32%
Fee Waivers and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.05%) [1]
Total Annual Portfolio Operating Expenses After Fee Waivers and/or Expense Reimbursements rr_NetExpensesOverAssets 1.27% [1]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 129
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 413
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 719
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,586
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 18.11%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 6.73%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 7.90%
SA Multi-Managed Moderate Growth Portfolio | Class 3  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.85%
Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.32%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 1.42%
Fee Waivers and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.05%) [1]
Total Annual Portfolio Operating Expenses After Fee Waivers and/or Expense Reimbursements rr_NetExpensesOverAssets 1.37% [1]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 139
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 444
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 772
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,698
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 17.99%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 6.63%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 7.79%
[1] Pursuant to a Fee Waiver Agreement, effective May 1, 2019, SunAmerica Asset Management, LLC ("SunAmerica") contractually agreed to waive a portion of its advisory fee for the Portfolio so that the advisory fee on average daily net assets payable to SunAmerica equals 0.80% on the first $250 million, 0.75% on the next $250 million, and 0.70% above $500 million. This waiver agreement may be modified or discontinued prior to July 31, 2021 only with the approval of the Board of Trustees (the "Board") of Seasons Series Trust (the "Trust"), including a majority of the trustees of the Board who are not "interested persons" of the Trust as defined in the Investment Company Act of 1940, as amended.