Label	Element	Value
International Value Portfolio \| International Value Portfolio
Prospectus [Line Items]	oef_ProspectusLineItems
Risk/Return [Heading]	oef_RiskReturnHeading	International Value Portfolio
Objective [Heading]	oef_ObjectiveHeading	Investment Goal
Objective, Primary [Text Block]	oef_ObjectivePrimaryTextBlock	This Fund seeks long-term capital appreciation primarily through investment in equity securities of corporations domiciled in countries with developed economies and markets other than the U.S. Current income from dividends and interest will not be an important consideration.
Expense Heading [Optional Text]	oef_ExpenseHeading	Fees and Expenses of the Fund
Expense Narrative [Text Block]	oef_ExpenseNarrativeTextBlock	This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and Examples below. The table and Examples below also do not reflect expenses and charges that are imposed under your variable annuity contract or variable life insurance policy. For information on these expenses and charges, please refer to the applicable contract or policy prospectus. If these fees and expenses were included, the fees and expenses shown would be higher.
Operating Expenses Caption [Optional Text]	oef_OperatingExpensesCaption	Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Expense Example [Heading]	oef_ExpenseExampleHeading	Examples
Expense Example Narrative [Text Block]	oef_ExpenseExampleNarrativeTextBlock	The Examples are intended to help you compare the cost of investing in the Fund with the cost of investing in other Funds of the Trust or other mutual funds. The Examples assume that you invest $10,000 for the time periods indicated, that your investment has a 5% return each year and that the Fund’s annual operating expenses remain as stated in the previous table for the time periods shown. Although your actual costs may be higher or lower, the Examples show what your costs would be based on these assumptions. These Examples do not reflect fees and expenses of any variable annuity contract or variable life insurance policy. If these were included, the expenses (in dollars) shown would be higher. Keep in mind that this is only an estimate; actual expenses and performance may vary.
Expense Example by, Year, Caption [Text]	oef_ExpenseExampleByYearCaption	Your expenses (in dollars) if you buy, sell/redeem or hold all of your shares at the end of each period
Expense Example, No Redemption, By Year, Caption [Text]	oef_ExpenseExampleNoRedemptionByYearCaption	Your expenses (in dollars) if you buy, sell/redeem or hold all of your shares at the end of each period
Portfolio Turnover [Heading]	oef_PortfolioTurnoverHeading	Portfolio Turnover
Portfolio Turnover [Text Block]	oef_PortfolioTurnoverTextBlock	The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its holdings). During the fiscal year ended December 31, 2024, the portfolio turnover rate was 53% of the average value of the Fund. A higher portfolio turnover rate reflects a greater number of securities being bought or sold, which may indicate higher transaction costs. These costs, which are not reflected in Annual Fund Operating Expenses or in the Examples, affect the Fund’s performance.
Portfolio Turnover, Rate	oef_PortfolioTurnoverRate	53.00%
Strategy [Heading]	oef_StrategyHeading	Principal Investment Strategies
Strategy Narrative [Text Block]	oef_StrategyNarrativeTextBlock	This Fund invests primarily in a diversified portfolio of equity securities of large foreign companies that the sub-adviser believes to be undervalued. The sub-adviser uses a “contrarian value” approach to selecting securities, applying fundamental analysis to identify securities that it believes are undervalued by the market. The Fund may also invest in mid-capitalization companies. The market capitalizations of the portfolio holdings are generally those in the range of companies represented in the MSCI Europe, Australasia and Far East (“EAFE”) Index. As of December 31, 2024, the market capitalization range for the MSCI EAFE Index (Net) was approximately $3.2 billion to $384.9 billion. As of December 31, 2024, the weighted average market capitalization of the Fund was approximately $36.2 billion. Equity securities in which the Fund principally invests are common stocks. The Fund may invest in American Depositary Receipts (“ADRs”). Fund holdings may be U.S. dollar or foreign currency-denominated. The Fund may invest a high percentage of its assets in securities of issuers in a single country, a small number of countries, or a particular geographic region. However, under normal market conditions, the Fund generally expects to invest in a number of different foreign countries. The Fund may invest up to 25% of its assets in issuers that conduct their principal business activities in emerging markets or whose securities are traded principally on exchanges in emerging markets. The sub-adviser normally invests the Fund’s assets across different groups of industries/sectors, but may invest a significant percentage of the Fund’s assets in issuers in a single sector at its investment discretion in seeking the investment goal of the Fund. As of December 31, 2024, a significant portion of the Fund is represented by securities of companies in the Financial sector. The sub-adviser may sell a holding when it appreciates to a stated target, when there has been a change in the long-term investment outlook, or when other opportunities appear more attractive. The Fund may lend its portfolio holdings to certain financial institutions.
Bar Chart and Performance Table [Heading]	oef_BarChartAndPerformanceTableHeading	Performance
Performance Narrative [Text Block]	oef_PerformanceNarrativeTextBlock	The bar chart and Average Annual Total Returns table below provide some indication of the risk of investing in the Fund by showing changes in the performance of the Fund from year to year and showing how the Fund’s average annual total returns compare to a broad-based international equity market index. The bar chart shows the performance of the Fund’s Class I shares. Returns do not reflect fees and expenses of any variable annuity contract or variable life insurance policy; if these fees and expenses were included, the returns shown would be lower. Past performance is not necessarily an indication of how the Fund will perform in the future. Performance reflects fee waivers or expense limitations, if any, that were in effect during the periods presented. Wellington Management Company LLP began managing the Fund on May 1, 2017, and some investment policies changed at that time. Other firms managed the Fund before that date.
Performance Information Illustrates Variability of Returns [Text]	oef_PerformanceInformationIllustratesVariabilityOfReturns	The bar chart and Average Annual Total Returns table below provide some indication of the risk of investing in the Fund by showing changes in the performance of the Fund from year to year and showing how the Fund’s average annual total returns compare to a broad-based international equity market index.
Performance Past Does Not Indicate Future [Text]	oef_PerformancePastDoesNotIndicateFuture	Past performance is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading]	oef_BarChartHeading	Calendar Year Total Returns (%)
Bar Chart Does Not Reflect Sales Loads [Text]	oef_BarChartDoesNotReflectSalesLoads	Returns do not reflect fees and expenses of any variable annuity contract or variable life insurance policy; if these fees and expenses were included, the returns shown would be lower.
Bar Chart Closing [Text Block]	oef_BarChartClosingTextBlock	Best and worst quarterly performance reflected within the bar chart: Q4 2022: 21.56%; Q1 2020: (34.90%)
Highest Quarterly Return, Label [Optional Text]	oef_HighestQuarterlyReturnLabel	Best quarterly performance reflected within the bar chart:
Highest Quarterly Return, Date	oef_BarChartHighestQuarterlyReturnDate	Dec. 31, 2022
Highest Quarterly Return	oef_BarChartHighestQuarterlyReturn	21.56%
Lowest Quarterly Return, Label [Optional Text]	oef_LowestQuarterlyReturnLabel	worst quarterly performance reflected within the bar chart:
Lowest Quarterly Return, Date	oef_BarChartLowestQuarterlyReturnDate	Mar. 31, 2020
Lowest Quarterly Return	oef_BarChartLowestQuarterlyReturn	(34.90%)
Index No Deduction for Fees, Expenses, or Taxes [Text]	oef_IndexNoDeductionForFeesExpensesTaxes	(reflects no deductions for fees, expenses, or taxes)
Average Annual Return, Caption [Optional Text]	oef_AverageAnnualReturnCaption	Average Annual Total Returns (For the periods ended December 31, 2024)
International Value Portfolio \| International Value Portfolio \| Risk Lose Money [Member]
Prospectus [Line Items]	oef_ProspectusLineItems
Risk [Text Block]	oef_RiskTextBlock	As with any mutual fund, the value of the Fund’s investments, and therefore the value of your shares, may go up or down and you could lose money.
International Value Portfolio \| International Value Portfolio \| Risk Not Insured [Member]
Prospectus [Line Items]	oef_ProspectusLineItems
Risk [Text Block]	oef_RiskTextBlock	An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
International Value Portfolio \| International Value Portfolio \| Equity Securities Risk [Member]
Prospectus [Line Items]	oef_ProspectusLineItems
Risk [Text Block]	oef_RiskTextBlock	Equity Securities Risk: Equity securities tend to go up and down in value, sometimes rapidly and unpredictably.
International Value Portfolio \| International Value Portfolio \| Foreign (Non-U.S.) Markets Risk [Member]
Prospectus [Line Items]	oef_ProspectusLineItems
Risk [Text Block]	oef_RiskTextBlock	Foreign (Non-U.S.) Markets Risk: Investing in foreign issuers (companies or other entities) can involve more risks than investing in United States (“U.S.”) issuers, such as risks relating to market, economic, political, regulatory and geopolitical conditions relevant to that market. These factors can make investments in foreign issuers more volatile and less liquid than U.S. investments. Less stringent regulatory, accounting, and disclosure requirements and general supervision for issuers and markets are more common in certain foreign countries. Enforcing legal rights can be difficult, costly, and slow in certain foreign countries, and can be particularly difficult against foreign governments. In addition, foreign markets can react differently to these conditions than the U.S. market. Markets and economies throughout the world are becoming increasingly interconnected, and conditions or events in one market, country or region may adversely impact investments or issuers in, or foreign exchange rates with, another market, country or region. Depositary receipts are also subject to these risks.
International Value Portfolio \| International Value Portfolio \| Value Companies Risk [Member]
Prospectus [Line Items]	oef_ProspectusLineItems
Risk [Text Block]	oef_RiskTextBlock	Value Companies Risk: Value companies are those that a portfolio manager believes are undervalued and trading for less than their intrinsic values. There is a risk that the determination that a stock is undervalued is not correct or is not recognized in the market.
International Value Portfolio \| International Value Portfolio \| Large-Capitalization Companies Risk [Member]
Prospectus [Line Items]	oef_ProspectusLineItems
Risk [Text Block]	oef_RiskTextBlock	Large-Capitalization Companies Risk: Although large-capitalization companies tend to have more stable prices than smaller, less established companies, they are still subject to equity securities risk. In addition, large-capitalization equity security prices may not rise as much as prices of equity securities of small-capitalization companies.
International Value Portfolio \| International Value Portfolio \| Active Management Risk [Member]
Prospectus [Line Items]	oef_ProspectusLineItems
Risk [Text Block]	oef_RiskTextBlock	Active Management Risk: A portfolio manager’s judgments about the potential value or price appreciation of an investment may prove to be incorrect or fail to have the intended results, which could negatively impact the Fund’s performance.
International Value Portfolio \| International Value Portfolio \| Currency Risk [Member]
Prospectus [Line Items]	oef_ProspectusLineItems
Risk [Text Block]	oef_RiskTextBlock	Currency Risk: A decline in the value of a foreign (non-U.S.) currency relative to the U.S. dollar reduces the value in U.S. dollars of the Fund’s investments denominated in or with exposure to that foreign currency.
International Value Portfolio \| International Value Portfolio \| Financial Sector Risk [Member]
Prospectus [Line Items]	oef_ProspectusLineItems
Risk [Text Block]	oef_RiskTextBlock	Financial Sector Risk: The operations and businesses of Financial services companies are subject to extensive governmental regulation, the availability and cost of capital funds, and interest rate changes. General market downturns may affect financial services companies adversely.
International Value Portfolio \| International Value Portfolio \| Emerging Markets Risk [Member]
Prospectus [Line Items]	oef_ProspectusLineItems
Risk [Text Block]	oef_RiskTextBlock	Emerging Markets Risk: Investments in or exposure to investments in emerging market countries may be riskier than investments in or exposure to investments in U.S. and other developed markets for many reasons, including smaller market capitalizations, greater price volatility, less liquidity, lower credit quality, a higher degree of political and economic instability, the impact of economic sanctions, less governmental regulation and supervision of the financial industry and markets, and less stringent financial reporting and accounting standards and controls.
International Value Portfolio \| International Value Portfolio \| Geographic Focus Risk [Member]
Prospectus [Line Items]	oef_ProspectusLineItems
Risk [Text Block]	oef_RiskTextBlock	Geographic Focus Risk: If the Fund invests a significant portion of its assets in a single country, limited number of countries, or particular geographic region, then the risk increases that economic, political, social, or other conditions in those countries or that region will have a significant impact on the Fund’s performance. As a result, the Fund’s performance may be more volatile than the performance of more geographically diversified funds.
International Value Portfolio \| International Value Portfolio \| Mid-Capitalization Companies Risk [Member]
Prospectus [Line Items]	oef_ProspectusLineItems
Risk [Text Block]	oef_RiskTextBlock	Mid-Capitalization Companies Risk: Mid-capitalization companies may be subject to greater price volatility and may be more vulnerable to economic, market and industry changes than larger, more established companies.
International Value Portfolio \| International Value Portfolio \| Underlying Fund Risk [Member]
Prospectus [Line Items]	oef_ProspectusLineItems
Risk [Text Block]	oef_RiskTextBlock	Underlying Fund Risk: Because the Fund is available for investment by one or more “fund of funds” of the Trust and thus may have a significant percentage of its outstanding shares held by such fund of funds, a change in asset allocation by the fund of funds could result in large redemptions out of the Fund, causing the sale of securities in a short timeframe and potential increases in expenses to the Fund and its remaining shareholders, both of which could negatively impact performance.
International Value Portfolio \| International Value Portfolio \| Securities Lending Risk [Member]
Prospectus [Line Items]	oef_ProspectusLineItems
Risk [Text Block]	oef_RiskTextBlock	Securities Lending Risk: The Fund may engage in securities lending, which involves the risk that the Fund may suffer a loss if the borrower fails to return the loaned securities in a timely manner or at all. The Fund could also lose money due to the decline in the value of the collateral provided or a decline in the value of any investments made with cash collateral.
International Value Portfolio \| International Value Portfolio \| Class I
Prospectus [Line Items]	oef_ProspectusLineItems
Management Fees (as a percentage of Assets)	oef_ManagementFeesOverAssets	0.65%
Distribution and Service (12b-1) Fees	oef_DistributionAndService12b1FeesOverAssets	0.20%
Other Expenses (as a percentage of Assets):	oef_OtherExpensesOverAssets	0.06%
Expenses (as a percentage of Assets)	oef_ExpensesOverAssets	0.91%
Expense Example, with Redemption, 1 Year	oef_ExpenseExampleYear01	$ 93
Expense Example, with Redemption, 3 Years	oef_ExpenseExampleYear03	290
Expense Example, with Redemption, 5 Years	oef_ExpenseExampleYear05	504
Expense Example, with Redemption, 10 Years	oef_ExpenseExampleYear10	1,120
Expense Example, No Redemption, 1 Year	oef_ExpenseExampleNoRedemptionYear01	93
Expense Example, No Redemption, 3 Years	oef_ExpenseExampleNoRedemptionYear03	290
Expense Example, No Redemption, 5 Years	oef_ExpenseExampleNoRedemptionYear05	504
Expense Example, No Redemption, 10 Years	oef_ExpenseExampleNoRedemptionYear10	$ 1,120
International Value Portfolio \| International Value Portfolio \| Class P
Prospectus [Line Items]	oef_ProspectusLineItems
Management Fees (as a percentage of Assets)	oef_ManagementFeesOverAssets	0.65%
Other Expenses (as a percentage of Assets):	oef_OtherExpensesOverAssets	0.06%
Expenses (as a percentage of Assets)	oef_ExpensesOverAssets	0.71%
Expense Example, with Redemption, 1 Year	oef_ExpenseExampleYear01	$ 73
Expense Example, with Redemption, 3 Years	oef_ExpenseExampleYear03	227
Expense Example, with Redemption, 5 Years	oef_ExpenseExampleYear05	395
Expense Example, with Redemption, 10 Years	oef_ExpenseExampleYear10	883
Expense Example, No Redemption, 1 Year	oef_ExpenseExampleNoRedemptionYear01	73
Expense Example, No Redemption, 3 Years	oef_ExpenseExampleNoRedemptionYear03	227
Expense Example, No Redemption, 5 Years	oef_ExpenseExampleNoRedemptionYear05	395
Expense Example, No Redemption, 10 Years	oef_ExpenseExampleNoRedemptionYear10	$ 883
International Value Portfolio \| MSCI EAFE Index (reflects no deductions for fees, expenses, or taxes)
Prospectus [Line Items]	oef_ProspectusLineItems
Average Annual Return, Label [Optional Text]	oef_AverageAnnualReturnLabel	MSCI EAFE Index (reflects no deductions for fees, expenses, or taxes)
Average Annual Return, Percent	oef_AvgAnnlRtrPct	3.82%
Average Annual Return, Percent	oef_AvgAnnlRtrPct	4.73%
Average Annual Return, Percent	oef_AvgAnnlRtrPct	5.20%
International Value Portfolio \| Class I
Prospectus [Line Items]	oef_ProspectusLineItems
Annual Return [Percent]	oef_AnnlRtrPct	(2.63%)
Annual Return [Percent]	oef_AnnlRtrPct	2.98%
Annual Return [Percent]	oef_AnnlRtrPct	21.57%
Annual Return [Percent]	oef_AnnlRtrPct	(14.96%)
Annual Return [Percent]	oef_AnnlRtrPct	16.60%
Annual Return [Percent]	oef_AnnlRtrPct	(7.17%)
Annual Return [Percent]	oef_AnnlRtrPct	20.36%
Annual Return [Percent]	oef_AnnlRtrPct	(1.26%)
Annual Return [Percent]	oef_AnnlRtrPct	20.20%
Annual Return [Percent]	oef_AnnlRtrPct	3.89%
Average Annual Return, Label [Optional Text]	oef_AverageAnnualReturnLabel	Class I (incepted January 4, 1988)
Average Annual Return, Percent	oef_AvgAnnlRtrPct	3.89%
Average Annual Return, Percent	oef_AvgAnnlRtrPct	6.62%
Average Annual Return, Percent	oef_AvgAnnlRtrPct	5.23%
Performance Inception Date	oef_PerfInceptionDate	Jan. 04, 1988
International Value Portfolio \| Class P
Prospectus [Line Items]	oef_ProspectusLineItems
Average Annual Return, Label [Optional Text]	oef_AverageAnnualReturnLabel	Class P (incepted May 2, 2011)
Average Annual Return, Percent	oef_AvgAnnlRtrPct	4.10%
Average Annual Return, Percent	oef_AvgAnnlRtrPct	6.83%
Average Annual Return, Percent	oef_AvgAnnlRtrPct	5.44%
Performance Inception Date	oef_PerfInceptionDate	May 02, 2011

Label

Element

Value

International Value Portfolio | International Value Portfolio

Prospectus [Line Items]

oef_ProspectusLineItems

Risk/Return [Heading]

oef_RiskReturnHeading

International Value Portfolio

Objective [Heading]

oef_ObjectiveHeading

Investment Goal

Objective, Primary [Text Block]

oef_ObjectivePrimaryTextBlock

This Fund seeks long-term capital appreciation primarily through investment in equity securities of corporations domiciled in countries with developed economies and markets other than the U.S. Current income from dividends and interest will not be an important consideration.

Expense Heading [Optional Text]

oef_ExpenseHeading

Fees and Expenses of the Fund

Expense Narrative [Text Block]

oef_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and Examples below. The table and Examples below also do not reflect expenses and charges that are imposed under your variable annuity contract or variable life insurance policy. For information on these expenses and charges, please refer to the applicable contract or policy prospectus. If these fees and expenses were included, the fees and expenses shown would be higher.

Operating Expenses Caption [Optional Text]

oef_OperatingExpensesCaption

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Expense Example [Heading]

oef_ExpenseExampleHeading

Examples

Expense Example Narrative [Text Block]

oef_ExpenseExampleNarrativeTextBlock

The Examples are intended to help you compare the cost of investing in the Fund with the cost of investing in other Funds of the Trust or other mutual funds. The Examples assume that you invest $10,000 for the time periods indicated, that your investment has a 5% return each year and that the Fund’s annual operating expenses remain as stated in the previous table for the time periods shown. Although your actual costs may be higher or lower, the Examples show what your costs would be based on these assumptions.

These Examples do not reflect fees and expenses of any variable annuity contract or variable life insurance policy. If these were included, the expenses (in dollars) shown would be higher. Keep in mind that this is only an estimate; actual expenses and performance may vary.

Expense Example by, Year, Caption [Text]

oef_ExpenseExampleByYearCaption

Your expenses (in dollars) if you buy, sell/redeem or hold all of your shares at the end of each period

Expense Example, No Redemption, By Year, Caption [Text]

oef_ExpenseExampleNoRedemptionByYearCaption

Your expenses (in dollars) if you buy, sell/redeem or hold all of your shares at the end of each period

Portfolio Turnover [Heading]

oef_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

oef_PortfolioTurnoverTextBlock

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its holdings). During the fiscal year ended December 31, 2024, the portfolio turnover rate was 53% of the average value of the Fund. A higher portfolio turnover rate reflects a greater number of securities being bought

or sold, which may indicate higher transaction costs. These costs, which are not reflected in Annual Fund Operating Expenses or in the Examples, affect the Fund’s performance.

Portfolio Turnover, Rate

oef_PortfolioTurnoverRate

53.00%

Strategy [Heading]

oef_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

oef_StrategyNarrativeTextBlock

This Fund invests primarily in a diversified portfolio of equity securities of large foreign companies that the sub-adviser believes to be undervalued. The sub-adviser uses a “contrarian value” approach to selecting securities, applying fundamental analysis to identify securities that it believes are undervalued by the market. The Fund may also invest in mid-capitalization companies. The market capitalizations of the portfolio holdings are generally those in the range of companies represented in the MSCI Europe, Australasia and Far East (“EAFE”) Index. As of December 31, 2024, the market capitalization range for the MSCI EAFE Index (Net) was approximately $3.2 billion to $384.9 billion. As of December 31, 2024, the weighted average market capitalization of the Fund was approximately $36.2 billion.

Equity securities in which the Fund principally invests are common stocks. The Fund may invest in American Depositary Receipts (“ADRs”). Fund holdings may be U.S. dollar or foreign currency-denominated.

The Fund may invest a high percentage of its assets in securities of issuers in a single country, a small number of countries, or a particular geographic region. However, under normal market conditions, the Fund generally expects to invest in a number of different foreign countries.

The Fund may invest up to 25% of its assets in issuers that conduct their principal business activities in emerging markets or whose securities are traded principally on exchanges in emerging markets.

The sub-adviser normally invests the Fund’s assets across different groups of industries/sectors, but may invest a significant percentage of the Fund’s assets in issuers in a single sector at its investment discretion in seeking the investment goal of the Fund. As of December 31, 2024, a significant portion of the Fund is represented by securities of companies in the Financial sector.

The sub-adviser may sell a holding when it appreciates to a stated target, when there has been a change in the long-term investment outlook, or when other opportunities appear more attractive.

The Fund may lend its portfolio holdings to certain financial institutions.

Bar Chart and Performance Table [Heading]

oef_BarChartAndPerformanceTableHeading

Performance

Performance Narrative [Text Block]

oef_PerformanceNarrativeTextBlock

The bar chart and Average Annual Total Returns table below provide some indication of the risk of investing in the Fund by showing changes in the performance of the Fund from year to year and showing how the Fund’s average annual total returns compare to a broad-based international equity market index. The bar chart shows the performance of the Fund’s Class I shares. Returns do not reflect fees and expenses of any variable annuity contract or variable life insurance policy; if these fees and expenses were included, the returns shown would be lower. Past performance is not necessarily an indication of how the Fund will perform in the future. Performance reflects fee waivers or expense limitations, if any, that were in effect during the periods presented.

Wellington Management Company LLP began managing the Fund on May 1, 2017, and some investment policies changed at that time. Other firms managed the Fund before that date.

Performance Information Illustrates Variability of Returns [Text]

oef_PerformanceInformationIllustratesVariabilityOfReturns

Performance Past Does Not Indicate Future [Text]

oef_PerformancePastDoesNotIndicateFuture

Past performance is not necessarily an indication of how the Fund will perform in the future.

Bar Chart [Heading]

oef_BarChartHeading

Calendar Year Total Returns (%)

Bar Chart Does Not Reflect Sales Loads [Text]

oef_BarChartDoesNotReflectSalesLoads

Returns do not reflect fees and expenses of any variable annuity contract or variable life insurance policy; if these fees and expenses were included, the returns shown would be lower.

Bar Chart Closing [Text Block]

oef_BarChartClosingTextBlock

Best and worst quarterly performance reflected within the bar chart: Q4 2022: 21.56%; Q1 2020: (34.90%)

Highest Quarterly Return, Label [Optional Text]

oef_HighestQuarterlyReturnLabel

Best quarterly performance reflected within the bar chart:

Highest Quarterly Return, Date

oef_BarChartHighestQuarterlyReturnDate

Dec. 31, 2022

Highest Quarterly Return

oef_BarChartHighestQuarterlyReturn

21.56%

Lowest Quarterly Return, Label [Optional Text]

oef_LowestQuarterlyReturnLabel

worst quarterly performance reflected within the bar chart:

Lowest Quarterly Return, Date

oef_BarChartLowestQuarterlyReturnDate

Mar. 31, 2020

Lowest Quarterly Return

oef_BarChartLowestQuarterlyReturn

(34.90%)

Index No Deduction for Fees, Expenses, or Taxes [Text]

oef_IndexNoDeductionForFeesExpensesTaxes

(reflects no deductions for fees, expenses, or taxes)

Average Annual Return, Caption [Optional Text]

oef_AverageAnnualReturnCaption

Average Annual Total Returns (For the periods ended December 31, 2024)

International Value Portfolio | International Value Portfolio | Risk Lose Money [Member]

Prospectus [Line Items]

oef_ProspectusLineItems

Risk [Text Block]

oef_RiskTextBlock

As with any mutual fund, the value of the Fund’s investments, and therefore the value of your shares, may go up or down and you could lose money.

International Value Portfolio | International Value Portfolio | Risk Not Insured [Member]

Prospectus [Line Items]

oef_ProspectusLineItems

Risk [Text Block]

oef_RiskTextBlock

An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

International Value Portfolio | International Value Portfolio | Equity Securities Risk [Member]

Prospectus [Line Items]

oef_ProspectusLineItems

Risk [Text Block]

oef_RiskTextBlock

Equity Securities Risk: Equity securities tend to go up and down in value, sometimes rapidly and unpredictably.

International Value Portfolio | International Value Portfolio | Foreign (Non-U.S.) Markets Risk [Member]

Prospectus [Line Items]

oef_ProspectusLineItems

Risk [Text Block]

oef_RiskTextBlock

Foreign (Non-U.S.) Markets Risk: Investing in foreign issuers (companies or other entities) can involve more risks than investing in United States (“U.S.”) issuers, such as risks relating to market, economic, political, regulatory and geopolitical conditions relevant to that market. These factors can make investments in foreign issuers more volatile and less liquid than U.S. investments. Less stringent regulatory, accounting, and disclosure requirements and general supervision for issuers and markets are more common in certain foreign countries. Enforcing legal rights can be difficult, costly, and slow in certain foreign countries, and can be particularly difficult against foreign governments. In addition, foreign markets can react differently to these conditions than the U.S. market. Markets and economies throughout the world are becoming increasingly interconnected, and conditions or events in one market, country or region may adversely impact investments or issuers in, or foreign exchange rates with, another market, country or region. Depositary receipts are also subject to these risks.

International Value Portfolio | International Value Portfolio | Value Companies Risk [Member]

Prospectus [Line Items]

oef_ProspectusLineItems

Risk [Text Block]

oef_RiskTextBlock

Value Companies Risk: Value companies are those that a portfolio manager believes are undervalued and trading for less than their intrinsic values. There is a risk that the determination that a stock is undervalued is not correct or is not recognized in the market.

International Value Portfolio | International Value Portfolio | Large-Capitalization Companies Risk [Member]

Prospectus [Line Items]

oef_ProspectusLineItems

Risk [Text Block]

oef_RiskTextBlock

Large-Capitalization Companies Risk: Although large-capitalization companies tend to have more stable prices than smaller, less established companies, they are still subject to equity securities risk. In addition, large-capitalization equity security prices may not rise as much as prices of equity securities of small-capitalization companies.

International Value Portfolio | International Value Portfolio | Active Management Risk [Member]

Prospectus [Line Items]

oef_ProspectusLineItems

Risk [Text Block]

oef_RiskTextBlock

Active Management Risk: A portfolio manager’s judgments about the potential value or price appreciation of an investment may prove to be incorrect or fail to have the intended results, which could negatively impact the Fund’s performance.

International Value Portfolio | International Value Portfolio | Currency Risk [Member]

Prospectus [Line Items]

oef_ProspectusLineItems

Risk [Text Block]

oef_RiskTextBlock

Currency Risk: A decline in the value of a foreign (non-U.S.) currency relative to the U.S. dollar reduces the value in U.S. dollars of the Fund’s investments denominated in or with exposure to that foreign currency.

International Value Portfolio | International Value Portfolio | Financial Sector Risk [Member]

Prospectus [Line Items]

oef_ProspectusLineItems

Risk [Text Block]

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Financial Sector Risk: The operations and businesses of Financial services companies are subject to extensive governmental regulation, the availability and cost of capital funds, and interest rate changes. General market downturns may affect financial services companies adversely.

International Value Portfolio | International Value Portfolio | Emerging Markets Risk [Member]

Prospectus [Line Items]

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Risk [Text Block]

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Emerging Markets Risk: Investments in or exposure to investments in emerging market countries may be riskier than investments in or exposure to investments in U.S. and other developed markets for many reasons, including smaller market capitalizations, greater price volatility, less liquidity, lower credit quality, a higher degree of political and economic instability, the impact of economic sanctions, less governmental

regulation and supervision of the financial industry and markets, and less stringent financial reporting and accounting standards and controls.

International Value Portfolio | International Value Portfolio | Geographic Focus Risk [Member]

Prospectus [Line Items]

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Risk [Text Block]

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Geographic Focus Risk: If the Fund invests a significant portion of its assets in a single country, limited number of countries, or particular geographic region, then the risk increases that economic, political, social, or other conditions in those countries or that region will have a significant impact on the Fund’s performance. As a result, the Fund’s performance may be more volatile than the performance of more geographically diversified funds.

International Value Portfolio | International Value Portfolio | Mid-Capitalization Companies Risk [Member]

Prospectus [Line Items]

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Risk [Text Block]

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Mid-Capitalization Companies Risk: Mid-capitalization companies may be subject to greater price volatility and may be more vulnerable to economic, market and industry changes than larger, more established companies.

International Value Portfolio | International Value Portfolio | Underlying Fund Risk [Member]

Prospectus [Line Items]

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Risk [Text Block]

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Underlying Fund Risk: Because the Fund is available for investment by one or more “fund of funds” of the Trust and thus may have a significant percentage of its outstanding shares held by such fund of funds, a change in asset allocation by the fund of funds could result in large redemptions out of the Fund, causing the sale of securities in a short timeframe and potential increases in expenses to the Fund and its remaining shareholders, both of which could negatively impact performance.

International Value Portfolio | International Value Portfolio | Securities Lending Risk [Member]

Prospectus [Line Items]

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Risk [Text Block]

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Securities Lending Risk: The Fund may engage in securities lending, which involves the risk that the Fund may suffer a loss if the borrower fails to return the loaned securities in a timely manner or at all. The Fund could also lose money due to the decline in the value of the collateral provided or a decline in the value of any investments made with cash collateral.

International Value Portfolio | International Value Portfolio | Class I

Prospectus [Line Items]

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Management Fees (as a percentage of Assets)

oef_ManagementFeesOverAssets

0.65%

Distribution and Service (12b-1) Fees

oef_DistributionAndService12b1FeesOverAssets

0.20%

Other Expenses (as a percentage of Assets):

oef_OtherExpensesOverAssets

0.06%