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International Large-Cap Portfolio | International Large-Cap Portfolio  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk/Return [Heading] oef_RiskReturnHeading International Large-Cap 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)
Fee Waiver or Reimbursement over Assets, Date of Termination oef_FeeWaiverOrReimbursementOverAssetsDateOfTermination Apr. 30, 2026
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 except for the fee waiver, which is only reflected for the contractual period. 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 23% 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 23.00%
Strategy [Heading] oef_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] oef_StrategyNarrativeTextBlock
Under normal circumstances, this Fund invests at least 80% of its assets in securities of large-capitalization companies. The sub-adviser generally considers a company to be a large-capitalization company if the company has a market capitalization within the range of companies included 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 $119.7 billion.
The Fund invests primarily in common stocks and depositary receipts of foreign issuers, including up to 25% in emerging market countries, that 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 sub-adviser may invest the Fund’s assets in the stocks of companies that it believes have above average earnings growth potential compared to other companies (growth companies), in the stocks of companies that it believes are undervalued compared to their perceived worth (value companies), or in a combination of growth and value companies.
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 sub-adviser uses an active bottom-up investment approach to buying and selling investments for the Fund. Investments are selected primarily based on fundamental analysis of individual issuers and their potential in light of their financial condition, and market, economic, political, and regulatory conditions. Factors considered may include analysis of an issuer’s earnings, cash flows, competitive position, and management ability. Quantitative screening tools that systematically evaluate an issuer’s valuation, price and earnings momentum, earnings quality, and other factors, may also be considered.
The sub-adviser may sell a holding for a variety of reasons, such as to secure gains, limit losses, or redeploy assets into opportunities believed to be more promising, among others.
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: Q2 2020: 15.81%; Q1 2020: (20.65%)
Highest Quarterly Return, Label [Optional Text] oef_HighestQuarterlyReturnLabel Best quarterly performance reflected within the bar chart:
Highest Quarterly Return, Date oef_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return oef_BarChartHighestQuarterlyReturn 15.81%
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 (20.65%)
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 Large-Cap Portfolio | International Large-Cap 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 Large-Cap Portfolio | International Large-Cap 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 Large-Cap Portfolio | International Large-Cap 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 Large-Cap Portfolio | International Large-Cap 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 Large-Cap Portfolio | International Large-Cap 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 Large-Cap Portfolio | International Large-Cap 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 Large-Cap Portfolio | International Large-Cap 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 Large-Cap Portfolio | International Large-Cap 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 Large-Cap Portfolio | International Large-Cap 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 Large-Cap Portfolio | International Large-Cap 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 Large-Cap Portfolio | International Large-Cap 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 Large-Cap Portfolio | International Large-Cap 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 Large-Cap Portfolio | International Large-Cap 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 Large-Cap Portfolio | International Large-Cap 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 Large-Cap Portfolio | International Large-Cap 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 Large-Cap Portfolio | International Large-Cap Portfolio | Class I  
Prospectus [Line Items] oef_ProspectusLineItems  
Management Fees (as a percentage of Assets) oef_ManagementFeesOverAssets 0.77%
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 1.03%
Fee Waiver or Reimbursement oef_FeeWaiverOrReimbursementOverAssets (0.03%) [1]
Net Expenses (as a percentage of Assets) oef_NetExpensesOverAssets 1.00%
Expense Example, with Redemption, 1 Year oef_ExpenseExampleYear01 $ 102
Expense Example, with Redemption, 3 Years oef_ExpenseExampleYear03 325
Expense Example, with Redemption, 5 Years oef_ExpenseExampleYear05 566
Expense Example, with Redemption, 10 Years oef_ExpenseExampleYear10 1,257
Expense Example, No Redemption, 1 Year oef_ExpenseExampleNoRedemptionYear01 102
Expense Example, No Redemption, 3 Years oef_ExpenseExampleNoRedemptionYear03 325
Expense Example, No Redemption, 5 Years oef_ExpenseExampleNoRedemptionYear05 566
Expense Example, No Redemption, 10 Years oef_ExpenseExampleNoRedemptionYear10 $ 1,257
International Large-Cap Portfolio | International Large-Cap Portfolio | Class P  
Prospectus [Line Items] oef_ProspectusLineItems  
Management Fees (as a percentage of Assets) oef_ManagementFeesOverAssets 0.77%
Other Expenses (as a percentage of Assets): oef_OtherExpensesOverAssets 0.06%
Expenses (as a percentage of Assets) oef_ExpensesOverAssets 0.83%
Fee Waiver or Reimbursement oef_FeeWaiverOrReimbursementOverAssets (0.03%) [1]
Net Expenses (as a percentage of Assets) oef_NetExpensesOverAssets 0.80%
Expense Example, with Redemption, 1 Year oef_ExpenseExampleYear01 $ 82
Expense Example, with Redemption, 3 Years oef_ExpenseExampleYear03 262
Expense Example, with Redemption, 5 Years oef_ExpenseExampleYear05 458
Expense Example, with Redemption, 10 Years oef_ExpenseExampleYear10 1,023
Expense Example, No Redemption, 1 Year oef_ExpenseExampleNoRedemptionYear01 82
Expense Example, No Redemption, 3 Years oef_ExpenseExampleNoRedemptionYear03 262
Expense Example, No Redemption, 5 Years oef_ExpenseExampleNoRedemptionYear05 458
Expense Example, No Redemption, 10 Years oef_ExpenseExampleNoRedemptionYear10 $ 1,023
International Large-Cap 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 Large-Cap Portfolio | Class I  
Prospectus [Line Items] oef_ProspectusLineItems  
Annual Return [Percent] oef_AnnlRtrPct (0.44%)
Annual Return [Percent] oef_AnnlRtrPct (0.08%)
Annual Return [Percent] oef_AnnlRtrPct 27.51%
Annual Return [Percent] oef_AnnlRtrPct (11.81%)
Annual Return [Percent] oef_AnnlRtrPct 28.03%
Annual Return [Percent] oef_AnnlRtrPct 10.74%
Annual Return [Percent] oef_AnnlRtrPct 14.78%
Annual Return [Percent] oef_AnnlRtrPct (15.19%)
Annual Return [Percent] oef_AnnlRtrPct 18.65%
Annual Return [Percent] oef_AnnlRtrPct 3.68%
Average Annual Return, Label [Optional Text] oef_AverageAnnualReturnLabel Class I (incepted January 3, 2000)
Average Annual Return, Percent oef_AvgAnnlRtrPct 3.68%
Average Annual Return, Percent oef_AvgAnnlRtrPct 5.81%
Average Annual Return, Percent oef_AvgAnnlRtrPct 6.62%
Performance Inception Date oef_PerfInceptionDate Jan. 03, 2000
International Large-Cap 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 3.88%
Average Annual Return, Percent oef_AvgAnnlRtrPct 6.02%
Average Annual Return, Percent oef_AvgAnnlRtrPct 6.84%
Performance Inception Date oef_PerfInceptionDate May 02, 2011
[1] The investment adviser has agreed to waive 0.03% of its management fee through April 30, 2026. Thereafter, the fee waiver agreement renews annually unless terminated by the investment adviser upon at least 30 days written notice prior to the end of the contract term or upon termination of the investment advisory agreement or by the Trust upon 90 days’ written notice to the investment adviser.