Label	Element	Value
SA Multi-Managed Mid Cap Growth Portfolio
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	SA Multi-Managed Mid Cap 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.
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)
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 47% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	47.00%
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. 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 investing, under normal circumstances, at least 80% of net assets in equity securities of medium-capitalization companies selected through a growth strategy. Medium-capitalization, or mid-cap, companies will generally include companies whose market capitalizations range from the market capitalization of the smallest company included in the Russell Midcap^® Index to the market capitalization of the largest company in the Russell Midcap^®Index during the most recent 12-month period. As of May 31, 2020, the market capitalization range of the companies in the Russell Midcap^® Index was between approximately $127.1 million and $72.5 billion. The Portfolio may invest a substantial portion of its assets in equity securities of small- and large-capitalization companies, short-term investments (up to 20%) and foreign securities (up to 30%). The Portfolio is actively managed by two subadvisers. To balance the risks of the Portfolio, a portion of the Portfolio is passively managed by SunAmerica Asset Management, LLC (“SunAmerica”) which invests in all or substantially all of the stocks included in the Russell Midcap^® Growth Index (the “Index”), a strategy known as “replication.” SunAmerica may, however, utilize an “optimization” strategy in circumstances in which replication is difficult or impossible, such as if the Portfolio has low asset levels and cannot replicate, to reduce trading costs or to gain exposure to securities that the Portfolio cannot access directly. The goal of optimization is to select stocks which ensure that characteristics such as industry weightings, average market capitalizations and fundamental characteristics (e.g., price-to-book, price-to-earnings, debt-to-asset ratios and dividend yields) closely approximate those of the Index. Stocks not in the Index may be held before or after changes in the composition of the Index or if they have characteristics similar to stocks in the Index.
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. 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. 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. 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 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. 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. Failure to Match Index Performance Risk. The ability of the Portfolio to match the performance of the Index may be affected by, among other things, changes in securities markets, the manner in which performance of the Index is calculated, changes in the composition of the Index, the amount and timing of cash flows into and out of the Portfolio, commissions, portfolio expenses, and any differences in the pricing of securities by the Portfolio and the Index. When the Portfolio employs an “optimization” strategy, the Portfolio is subject to an increased risk of tracking error, in that the securities selected in the aggregate for the Portfolio may perform differently than the underlying index. Index Risk. The passively-managed index portion of the Portfolio generally will not sell securities in its portfolio and buy different securities over the course of a year other than in conjunction with changes in its target index, even if there are adverse developments concerning a particular security, company or industry. As a result, you may suffer losses that you would not experience with an actively-managed mutual fund. 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. 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. 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.
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 Russell Midcap^® Growth 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.
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 Russell Midcap® Growth 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 20.89% (quarter ended March 31, 2019) and the lowest return for a quarter was -20.63% (quarter ended September 30, 2011). The year-to-date calendar return as of June 30, 2020 was 7.79%.
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	7.79%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	highest return
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Mar. 31, 2019
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	20.89%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	lowest return
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Sep. 30, 2011
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(20.63%)
Average Annual Return, Caption	rr_AverageAnnualReturnCaption	Average Annual Total Returns (For the periods ended December 31, 2019)
SA Multi-Managed Mid Cap Growth Portfolio \| Russell Midcap® Growth Index
Risk/Return:	rr_RiskReturnAbstract
Average Annual Returns, 1 Year	rr_AverageAnnualReturnYear01	35.47%
Average Annual Returns, 5 Years	rr_AverageAnnualReturnYear05	11.60%
Average Annual Returns, 10 Years	rr_AverageAnnualReturnYear10	14.24%
SA Multi-Managed Mid Cap 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	0.10%
Total Annual Portfolio Operating Expenses	rr_ExpensesOverAssets	0.95%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	$ 97
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	303
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	525
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	$ 1,166
Annual Return 2010	rr_AnnualReturn2010	25.34%
Annual Return 2011	rr_AnnualReturn2011	(5.51%)
Annual Return 2012	rr_AnnualReturn2012	17.16%
Annual Return 2013	rr_AnnualReturn2013	34.82%
Annual Return 2014	rr_AnnualReturn2014	9.70%
Annual Return 2015	rr_AnnualReturn2015	0.36%
Annual Return 2016	rr_AnnualReturn2016	4.71%
Annual Return 2017	rr_AnnualReturn2017	26.35%
Annual Return 2018	rr_AnnualReturn2018	(3.52%)
Annual Return 2019	rr_AnnualReturn2019	36.16%
Average Annual Returns, 1 Year	rr_AverageAnnualReturnYear01	36.16%
Average Annual Returns, 5 Years	rr_AverageAnnualReturnYear05	11.77%
Average Annual Returns, 10 Years	rr_AverageAnnualReturnYear10	13.60%
SA Multi-Managed Mid Cap 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	0.10%
Total Annual Portfolio Operating Expenses	rr_ExpensesOverAssets	1.10%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	$ 112
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	350
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	606
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	$ 1,340
Average Annual Returns, 1 Year	rr_AverageAnnualReturnYear01	36.00%
Average Annual Returns, 5 Years	rr_AverageAnnualReturnYear05	11.61%
Average Annual Returns, 10 Years	rr_AverageAnnualReturnYear10	13.44%
SA Multi-Managed Mid Cap 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	0.10%
Total Annual Portfolio Operating Expenses	rr_ExpensesOverAssets	1.20%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	$ 122
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	381
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	660
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	$ 1,455
Average Annual Returns, 1 Year	rr_AverageAnnualReturnYear01	35.75%
Average Annual Returns, 5 Years	rr_AverageAnnualReturnYear05	11.50%
Average Annual Returns, 10 Years	rr_AverageAnnualReturnYear10	13.33%

Label

Element

Value

SA Multi-Managed Mid Cap Growth Portfolio

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

SA Multi-Managed Mid Cap 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.

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)

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 47% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

47.00%

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. 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 investing, under normal circumstances, at least 80% of net assets in equity securities of medium-capitalization companies selected through a growth strategy. Medium-capitalization, or mid-cap, companies will generally include companies whose market capitalizations range from the market capitalization of the smallest company included in the Russell Midcap^® Index to the market capitalization of the largest company in the Russell Midcap^®Index during the most recent 12-month period. As of May 31, 2020, the market capitalization range of the companies in the Russell Midcap^® Index was between approximately $127.1 million and $72.5 billion.

The Portfolio may invest a substantial portion of its assets in equity securities of small- and large-capitalization companies, short-term investments (up to 20%) and foreign securities (up to 30%).

The Portfolio is actively managed by two subadvisers. To balance the risks of the Portfolio, a portion of the Portfolio is passively managed by SunAmerica Asset Management, LLC (“SunAmerica”) which invests in all or substantially all of the stocks included in the Russell Midcap^® Growth Index (the “Index”), a strategy known as “replication.” SunAmerica may, however, utilize an “optimization” strategy in circumstances in which replication is difficult or impossible, such as if the Portfolio has low asset levels and cannot replicate, to reduce trading costs or to gain exposure to securities that the Portfolio cannot access directly. The goal of optimization is to select stocks which ensure that characteristics such as industry weightings, average market capitalizations and fundamental characteristics (e.g., price-to-book, price-to-earnings, debt-to-asset ratios and dividend yields) closely approximate those of the Index. Stocks not in the Index may be held before or after changes in the composition of the Index or if they have characteristics similar to stocks in the Index.

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.

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.

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.

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 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.

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.

Failure to Match Index Performance Risk. The ability of the Portfolio to match the performance of the Index may be affected by, among other things, changes in securities markets, the manner in which performance of the Index is calculated, changes in the composition of the Index, the amount and timing of cash flows into and out of the Portfolio, commissions, portfolio expenses, and any differences in the pricing of securities by the Portfolio and the Index. When the Portfolio employs an “optimization” strategy, the Portfolio is subject to an increased risk of tracking error, in that the securities selected in the aggregate for the Portfolio may perform differently than the underlying index.

Index Risk. The passively-managed index portion of the Portfolio generally will not sell securities in its portfolio and buy different securities over the course of a year other than in conjunction with changes in its target index, even if there are adverse developments concerning a particular security, company or industry. As a result, you may suffer losses that you would not experience with an actively-managed mutual fund.

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.

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.

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.

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 Russell Midcap^® Growth 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.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

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 20.89% (quarter ended March 31, 2019) and the lowest return for a quarter was -20.63% (quarter ended September 30, 2011). The year-to-date calendar return as of June 30, 2020 was 7.79%.

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

7.79%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

highest return