Label	Element	Value
International Growth Portfolio \| International Growth Portfolio
Prospectus [Line Items]	oef_ProspectusLineItems
Risk/Return [Heading]	oef_RiskReturnHeading	International Growth Portfolio
Objective [Heading]	oef_ObjectiveHeading	Investment Goal
Objective, Primary [Text Block]	oef_ObjectivePrimaryTextBlock	This Fund seeks long-term growth of capital.
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 64% 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	64.00%
Strategy [Heading]	oef_StrategyHeading	Principal Investment Strategies
Strategy Narrative [Text Block]	oef_StrategyNarrativeTextBlock	The Fund normally invests primarily in common stocks of foreign companies, either directly or through depositary receipts, that, in the sub-adviser’s opinion, appear to offer above average growth potential and trade at a significant discount to the sub-adviser’s assessment of their intrinsic value. Intrinsic value, according to the sub-adviser, is the value of the company measured, to different extents depending on the type of company, on factors such as, but not limited to, the discounted value of the company’s projected future free cash flows, the company’s ability to earn returns on capital in excess of its cost of capital, private market values of similar companies and the costs to replicate the business. The Fund may invest in common stocks of foreign companies of any size located throughout the world that are U.S. dollar or foreign currency-denominated. The sub-adviser considers foreign companies to include those organized, headquartered or that have at least 50% of their assets or derive at least 50% of their revenues or profits from operations outside of the United States. These companies may be located or have substantial operations in emerging markets, provided that the Fund will not invest more than 15% of its net assets at the time of purchase in common stocks or depositary receipts of companies organized, headquartered or with substantial operations in emerging markets. The Fund may also purchase common stocks of U.S. companies. Any income realized will be incidental to the Fund’s investment goal. Common stocks and depositary receipts are considered equity securities. The selection of common stocks is made through a process whereby companies are identified and selected as investments by examining quantitative and fundamental aspects of the company. This is a bottom up, fundamental method of analysis. The sub-adviser may decide to sell investments given a variety of circumstances, such as when an investment no longer appears to the sub-adviser to offer the potential for long-term growth of capital, when an investment opportunity arises that the sub-adviser believes is more compelling or to realize gains or limit losses. 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 Consumer Non-Cyclical sector. 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.
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: 15.02%; Q2 2022: (13.98%)
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	15.02%
Lowest Quarterly Return, Label [Optional Text]	oef_LowestQuarterlyReturnLabel	worst quarterly performance reflected within the bar chart:
Lowest Quarterly Return, Date	oef_BarChartLowestQuarterlyReturnDate	Jun. 30, 2022
Lowest Quarterly Return	oef_BarChartLowestQuarterlyReturn	(13.98%)
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 Growth Portfolio \| International Growth 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 Growth Portfolio \| International Growth 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 Growth Portfolio \| International Growth 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 Growth Portfolio \| International Growth 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 Growth Portfolio \| International Growth Portfolio \| Growth Companies Risk [Member]
Prospectus [Line Items]	oef_ProspectusLineItems
Risk [Text Block]	oef_RiskTextBlock	Growth Companies Risk: Growth companies are those that a portfolio manager believes have the potential for above average or rapid growth but may be subject to greater price volatility than investments in “undervalued” companies.
International Growth Portfolio \| International Growth 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 Growth Portfolio \| International Growth 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 Growth Portfolio \| International Growth 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 Growth Portfolio \| International Growth 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 Growth Portfolio \| International Growth Portfolio \| Small-Capitalization Companies Risk [Member]
Prospectus [Line Items]	oef_ProspectusLineItems
Risk [Text Block]	oef_RiskTextBlock	Small-Capitalization Companies Risk: Small-capitalization companies may be more susceptible to liquidity risk and price volatility and be more vulnerable to economic, market and industry changes than larger, more established companies.
International Growth Portfolio \| International Growth 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 Growth Portfolio \| International Growth Portfolio \| Liquidity Risk [Member]
Prospectus [Line Items]	oef_ProspectusLineItems
Risk [Text Block]	oef_RiskTextBlock	Liquidity Risk: Certain holdings may be difficult to purchase, sell and value, particularly during adverse market conditions, because there is a limited market for the investment or there are restrictions on resale. The Fund may not be able to sell a holding quickly at the price it has valued the holding, may be unable to take advantage of market opportunities or may be forced to sell other more desirable, more liquid securities or sell less liquid or illiquid securities at a loss if needed to raise cash to conduct operations, including to meet redemption requests.
International Growth Portfolio \| International Growth Portfolio \| Consumer Non-Cyclical Sector Risk [Member]
Prospectus [Line Items]	oef_ProspectusLineItems
Risk [Text Block]	oef_RiskTextBlock	Consumer Non-Cyclical Sector Risk: Companies in the Consumer Non-cyclical products and services sector (which are generally considered essential staples) may be adversely impacted by changes in domestic and global economic conditions, consumer confidence and preferences, disposable household income and consumer spending, product cycles, marketing, demographics, production spending, competition, government regulations and factors impacting the supply, demand and prices of raw materials.
International Growth Portfolio \| International Growth 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 Growth Portfolio \| International Growth 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 Growth Portfolio \| International Growth Portfolio \| Class P
Prospectus [Line Items]	oef_ProspectusLineItems
Management Fees (as a percentage of Assets)	oef_ManagementFeesOverAssets	0.70%
Other Expenses (as a percentage of Assets):	oef_OtherExpensesOverAssets	0.05%
Expenses (as a percentage of Assets)	oef_ExpensesOverAssets	0.75%
Expense Example, with Redemption, 1 Year	oef_ExpenseExampleYear01	$ 77
Expense Example, with Redemption, 3 Years	oef_ExpenseExampleYear03	240
Expense Example, with Redemption, 5 Years	oef_ExpenseExampleYear05	417
Expense Example, with Redemption, 10 Years	oef_ExpenseExampleYear10	930
Expense Example, No Redemption, 1 Year	oef_ExpenseExampleNoRedemptionYear01	77
Expense Example, No Redemption, 3 Years	oef_ExpenseExampleNoRedemptionYear03	240
Expense Example, No Redemption, 5 Years	oef_ExpenseExampleNoRedemptionYear05	417
Expense Example, No Redemption, 10 Years	oef_ExpenseExampleNoRedemptionYear10	$ 930
International Growth Portfolio \| International Growth Portfolio \| Class I
Prospectus [Line Items]	oef_ProspectusLineItems
Management Fees (as a percentage of Assets)	oef_ManagementFeesOverAssets	0.70%
Distribution and Service (12b-1) Fees	oef_DistributionAndService12b1FeesOverAssets	0.20%
Other Expenses (as a percentage of Assets):	oef_OtherExpensesOverAssets	0.05%
Expenses (as a percentage of Assets)	oef_ExpensesOverAssets	0.95%
Expense Example, with Redemption, 1 Year	oef_ExpenseExampleYear01	$ 97
Expense Example, with Redemption, 3 Years	oef_ExpenseExampleYear03	303
Expense Example, with Redemption, 5 Years	oef_ExpenseExampleYear05	525
Expense Example, with Redemption, 10 Years	oef_ExpenseExampleYear10	1,166
Expense Example, No Redemption, 1 Year	oef_ExpenseExampleNoRedemptionYear01	97
Expense Example, No Redemption, 3 Years	oef_ExpenseExampleNoRedemptionYear03	303
Expense Example, No Redemption, 5 Years	oef_ExpenseExampleNoRedemptionYear05	525
Expense Example, No Redemption, 10 Years	oef_ExpenseExampleNoRedemptionYear10	$ 1,166
International Growth Portfolio \| MSCI EAFE Index (reflects no deductions for fees, expenses, or taxes) (based upon Class I inception date)
Prospectus [Line Items]	oef_ProspectusLineItems
Average Annual Return, Label [Optional Text]	oef_AverageAnnualReturnLabel	MSCI EAFE Index (reflects no deductions for fees, expenses, or taxes) (based upon Class I inception date)
Average Annual Return, Percent	oef_AvgAnnlRtrPct	3.82%
Average Annual Return, Percent	oef_AvgAnnlRtrPct	1.63%
International Growth Portfolio \| Class P
Prospectus [Line Items]	oef_ProspectusLineItems
Annual Return [Percent]	oef_AnnlRtrPct	(21.54%)
Annual Return [Percent]	oef_AnnlRtrPct	13.73%
Annual Return [Percent]	oef_AnnlRtrPct	7.39%
Average Annual Return, Label [Optional Text]	oef_AverageAnnualReturnLabel	Class P (incepted October 29, 2021)
Average Annual Return, Percent	oef_AvgAnnlRtrPct	7.61%
Average Annual Return, Percent	oef_AvgAnnlRtrPct	(1.34%)
Performance Inception Date	oef_PerfInceptionDate	Oct. 29, 2021
International Growth Portfolio \| Class I
Prospectus [Line Items]	oef_ProspectusLineItems
Average Annual Return, Label [Optional Text]	oef_AverageAnnualReturnLabel	Class I (incepted October 29, 2021)
Average Annual Return, Percent	oef_AvgAnnlRtrPct	7.39%
Average Annual Return, Percent	oef_AvgAnnlRtrPct	(1.60%)
Performance Inception Date	oef_PerfInceptionDate	Oct. 29, 2021

Label

Element

Value

International Growth Portfolio | International Growth Portfolio

Prospectus [Line Items]

oef_ProspectusLineItems

Risk/Return [Heading]

oef_RiskReturnHeading

International Growth Portfolio

Objective [Heading]

oef_ObjectiveHeading

Investment Goal

Objective, Primary [Text Block]

oef_ObjectivePrimaryTextBlock

This Fund seeks long-term growth of capital.

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 64% 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

64.00%

Strategy [Heading]

oef_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

oef_StrategyNarrativeTextBlock

The Fund normally invests primarily in common stocks of foreign companies, either directly or through depositary receipts,

that, in the sub-adviser’s opinion, appear to offer above average growth potential and trade at a significant discount to the sub-adviser’s assessment of their intrinsic value. Intrinsic value, according to the sub-adviser, is the value of the company measured, to different extents depending on the type of company, on factors such as, but not limited to, the discounted value of the company’s projected future free cash flows, the company’s ability to earn returns on capital in excess of its cost of capital, private market values of similar companies and the costs to replicate the business. The Fund may invest in common stocks of foreign companies of any size located throughout the world that are U.S. dollar or foreign currency-denominated. The sub-adviser considers foreign companies to include those organized, headquartered or that have at least 50% of their assets or derive at least 50% of their revenues or profits from operations outside of the United States. These companies may be located or have substantial operations in emerging markets, provided that the Fund will not invest more than 15% of its net assets at the time of purchase in common stocks or depositary receipts of companies organized, headquartered or with substantial operations in emerging markets. The Fund may also purchase common stocks of U.S. companies. Any income realized will be incidental to the Fund’s investment goal. Common stocks and depositary receipts are considered equity securities.

The selection of common stocks is made through a process whereby companies are identified and selected as investments by examining quantitative and fundamental aspects of the company. This is a bottom up, fundamental method of analysis. The sub-adviser may decide to sell investments given a variety of circumstances, such as when an investment no longer appears to the sub-adviser to offer the potential for long-term growth of capital, when an investment opportunity arises that the sub-adviser believes is more compelling or to realize gains or limit losses.

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 Consumer Non-Cyclical sector.

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.

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: 15.02%; Q2 2022: (13.98%)

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

15.02%

Lowest Quarterly Return, Label [Optional Text]

oef_LowestQuarterlyReturnLabel

worst quarterly performance reflected within the bar chart:

Lowest Quarterly Return, Date

oef_BarChartLowestQuarterlyReturnDate

Jun. 30, 2022

Lowest Quarterly Return

oef_BarChartLowestQuarterlyReturn

(13.98%)

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

Prospectus [Line Items]

oef_ProspectusLineItems

Risk [Text Block]

oef_RiskTextBlock

Growth Companies Risk: Growth companies are those that a portfolio manager believes have the potential for above average or rapid growth but may be subject to greater price volatility than investments in “undervalued” companies.

International Growth Portfolio | International Growth 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 Growth Portfolio | International Growth 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 Growth Portfolio | International Growth 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 Growth Portfolio | International Growth 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 Growth Portfolio | International Growth Portfolio | Small-Capitalization Companies Risk [Member]

Prospectus [Line Items]

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Risk [Text Block]

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Small-Capitalization Companies Risk: Small-capitalization companies may be more susceptible to liquidity risk and price volatility and be more vulnerable to economic, market and industry changes than larger, more established companies.

International Growth Portfolio | International Growth 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 Growth Portfolio | International Growth Portfolio | Liquidity Risk [Member]

Prospectus [Line Items]

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Risk [Text Block]

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Liquidity Risk: Certain holdings may be difficult to purchase, sell and value, particularly during adverse market conditions, because there is a limited market for the investment or there are restrictions on resale. The Fund may not be able to sell a holding quickly at the price it has valued the holding, may be unable to take advantage of market opportunities or may be forced to sell other more desirable, more liquid securities or sell less liquid or illiquid securities at a loss if needed to raise cash to conduct operations, including to meet redemption requests.

International Growth Portfolio | International Growth Portfolio | Consumer Non-Cyclical Sector Risk [Member]

Prospectus [Line Items]

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Risk [Text Block]

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Consumer Non-Cyclical Sector Risk: Companies in the Consumer Non-cyclical products and services sector (which are generally considered essential staples) may be adversely impacted by changes in domestic and global economic conditions, consumer confidence and preferences, disposable household income and consumer spending, product cycles, marketing, demographics, production spending, competition, government regulations and factors impacting the supply, demand and prices of raw materials.

International Growth Portfolio | International Growth 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 Growth Portfolio | International Growth 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 Growth Portfolio | International Growth Portfolio | Class P

Prospectus [Line Items]

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Management Fees (as a percentage of Assets)

oef_ManagementFeesOverAssets

0.70%

Other Expenses (as a percentage of Assets):

oef_OtherExpensesOverAssets

0.05%

Expenses (as a percentage of Assets)

oef_ExpensesOverAssets

0.75%