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Technology Portfolio | Technology Portfolio  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk/Return [Heading] oef_RiskReturnHeading Technology 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 123% 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 123.00%
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 equity securities of technology companies and technology-related companies.
The sub-adviser generally considers an issuer to be a technology or technology-related company if the company is principally engaged in offering, using, or developing products, processes, or services that will provide or will benefit significantly from technological advances and improvements. These companies are normally issuers that are (at the time of purchase) classified as being in the Technology sector by an independent third-party service provider which provides economic sector and industry classifications based upon business operations of companies. These companies may include, for example, manufacturers of communications equipment, products, and services, personal computers and other computer hardware components and peripherals; providers of information technology and systems integration services; companies developing and producing database management, home entertainment, educational, specialty, enterprise, and business software; manufacturers of electronic equipment, instruments or components, including copiers and faxes; semiconductor and related equipment manufacturers; and other information technology companies. The Fund normally will invest more than 25% of its assets in securities of companies in technology and related industries.
The Fund normally invests primarily in common stocks, including domestic and foreign equity issuers (which may be U.S. dollar or foreign currency-denominated). The Fund may invest in companies of all market capitalization sizes as well as both growth and value stocks. The Fund may invest in a smaller number of holdings.
In buying and selling securities for the Fund, the sub-adviser uses fundamental analysis of factors such as each issuer’s financial condition and industry position, as well as market and economic conditions.
The Fund is classified as non-diversified, which means it may invest in a smaller number of issuers than a diversified fund.
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 both to the returns of:
•
a broad-based domestic equity market index that represents the overall domestic equity market (the “Regulatory Index”) and thus may not necessarily represent the Fund’s principal investment strategies; and
​
•
a technology sector equity market index that the Investment Adviser considers to be more representative of the technology sector equity markets and the Fund’s principal investment strategies, and the appropriate benchmark index for the Fund for performance comparison.
​
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.
FIAM LLC began managing the Fund on May 1, 2024, 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 both to the returns of:•a broad-based domestic equity market index that represents the overall domestic equity market (the “Regulatory Index”) and thus may not necessarily represent the Fund’s principal investment strategies; and•a technology sector equity market index that the Investment Adviser considers to be more representative of the technology sector equity markets and the Fund’s principal investment strategies, and the appropriate benchmark index for the Fund for performance comparison.
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: 30.89%; Q2 2022: (21.65%)
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 30.89%
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 (21.65%)
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)
Technology Portfolio | Technology 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.
Technology Portfolio | Technology 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.
Technology Portfolio | Technology 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.
Technology Portfolio | Technology Portfolio | Technology Companies Risk [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock
Technology Companies Risk: Technology companies face a number of risks, including operating in rapidly changing fields, abrupt or erratic market movements, limited product lines, markets or financial resources, management that is dependent on a limited number of people, short product cycles, aggressive pricing of products and services, new market entrants and rapid obsolescence of products and services due to technological innovations or changing consumer preferences. By investing in these companies, the Fund is exposed to these risks. In addition, many U.S. companies in the technology sector have diverse operations, with products or services in foreign markets, exposing them to risks associated with foreign markets.
Technology Portfolio | Technology Portfolio | Industry Concentration Risk [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock
Industry Concentration Risk: Concentrating investments in a particular industry or group of industries makes the Fund more susceptible to adverse economic, business, regulatory or other developments affecting that industry or group of industries, which could negatively impact performance.
Technology Portfolio | Technology 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.
Technology Portfolio | Technology 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.
Technology Portfolio | Technology 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.
Technology Portfolio | Technology 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.
Technology Portfolio | Technology 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.
Technology Portfolio | Technology 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.
Technology Portfolio | Technology 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.
Technology Portfolio | Technology 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.
Technology Portfolio | Technology 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.
Technology Portfolio | Technology Portfolio | Risk Nondiversified Status [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock
Non-Diversification Risk: A fund that is classified as non-diversified may invest a greater percentage of its assets in a single issuer or a fewer number of issuers than a fund that is classified as diversified. This increases the risk that the Fund will have greater price swings over shorter periods of time because the poor performance of a single investment or a fewer number of investments will have a greater impact on the Fund than a diversified fund with more investments. Being classified as non-diversified does not prevent the Fund from being managed as though it were a diversified fund.
Technology Portfolio | Technology Portfolio | Small Number of Holdings Risk [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock
Small Number of Holdings Risk: Because performance may be dependent on a smaller number of holdings, the Fund may be more adversely impacted by price volatility than funds with a greater number of holdings.
Technology Portfolio | Technology 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.
Technology Portfolio | Technology 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.
Technology Portfolio | Technology 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.
Technology Portfolio | Technology 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.
Technology Portfolio | Technology Portfolio | Class I  
Prospectus [Line Items] oef_ProspectusLineItems  
Management Fees (as a percentage of Assets) oef_ManagementFeesOverAssets 0.90%
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 1.15%
Fee Waiver or Reimbursement oef_FeeWaiverOrReimbursementOverAssets (0.11%) [1]
Net Expenses (as a percentage of Assets) oef_NetExpensesOverAssets 1.04%
Expense Example, with Redemption, 1 Year oef_ExpenseExampleYear01 $ 106
Expense Example, with Redemption, 3 Years oef_ExpenseExampleYear03 354
Expense Example, with Redemption, 5 Years oef_ExpenseExampleYear05 622
Expense Example, with Redemption, 10 Years oef_ExpenseExampleYear10 1,388
Expense Example, No Redemption, 1 Year oef_ExpenseExampleNoRedemptionYear01 106
Expense Example, No Redemption, 3 Years oef_ExpenseExampleNoRedemptionYear03 354
Expense Example, No Redemption, 5 Years oef_ExpenseExampleNoRedemptionYear05 622
Expense Example, No Redemption, 10 Years oef_ExpenseExampleNoRedemptionYear10 $ 1,388
Technology Portfolio | Technology Portfolio | Class P  
Prospectus [Line Items] oef_ProspectusLineItems  
Management Fees (as a percentage of Assets) oef_ManagementFeesOverAssets 0.90%
Other Expenses (as a percentage of Assets): oef_OtherExpensesOverAssets 0.05%
Expenses (as a percentage of Assets) oef_ExpensesOverAssets 0.95%
Fee Waiver or Reimbursement oef_FeeWaiverOrReimbursementOverAssets (0.11%) [1]
Net Expenses (as a percentage of Assets) oef_NetExpensesOverAssets 0.84%
Expense Example, with Redemption, 1 Year oef_ExpenseExampleYear01 $ 86
Expense Example, with Redemption, 3 Years oef_ExpenseExampleYear03 292
Expense Example, with Redemption, 5 Years oef_ExpenseExampleYear05 515
Expense Example, with Redemption, 10 Years oef_ExpenseExampleYear10 1,156
Expense Example, No Redemption, 1 Year oef_ExpenseExampleNoRedemptionYear01 86
Expense Example, No Redemption, 3 Years oef_ExpenseExampleNoRedemptionYear03 292
Expense Example, No Redemption, 5 Years oef_ExpenseExampleNoRedemptionYear05 515
Expense Example, No Redemption, 10 Years oef_ExpenseExampleNoRedemptionYear10 $ 1,156
Technology Portfolio | MSCI US IMI Information Technology 25/50 Index (reflects no deductions for fees, expenses, or taxes)  
Prospectus [Line Items] oef_ProspectusLineItems  
Average Annual Return, Label [Optional Text] oef_AverageAnnualReturnLabel MSCI US IMI Information Technology 25/50 Index (reflects no deductions for fees, expenses, or taxes)
Average Annual Return, Percent oef_AvgAnnlRtrPct 29.14%
Average Annual Return, Percent oef_AvgAnnlRtrPct 21.24%
Average Annual Return, Percent oef_AvgAnnlRtrPct 20.15%
Technology Portfolio | S&P 500 Index (reflects no deductions for fees, expenses, or taxes) (Regulatory Index)  
Prospectus [Line Items] oef_ProspectusLineItems  
Average Annual Return, Label [Optional Text] oef_AverageAnnualReturnLabel S&P 500 Index (reflects no deductions for fees, expenses, or taxes) (Regulatory Index)
Average Annual Return, Percent oef_AvgAnnlRtrPct 25.02%
Average Annual Return, Percent oef_AvgAnnlRtrPct 14.53%
Average Annual Return, Percent oef_AvgAnnlRtrPct 13.10%
Technology Portfolio | Class I  
Prospectus [Line Items] oef_ProspectusLineItems  
Annual Return [Percent] oef_AnnlRtrPct (3.04%)
Annual Return [Percent] oef_AnnlRtrPct (6.61%)
Annual Return [Percent] oef_AnnlRtrPct 38.78%
Annual Return [Percent] oef_AnnlRtrPct 1.79%
Annual Return [Percent] oef_AnnlRtrPct 36.32%
Annual Return [Percent] oef_AnnlRtrPct 47.24%
Annual Return [Percent] oef_AnnlRtrPct 13.86%
Annual Return [Percent] oef_AnnlRtrPct (36.06%)
Annual Return [Percent] oef_AnnlRtrPct 53.68%
Annual Return [Percent] oef_AnnlRtrPct 37.45%
Average Annual Return, Label [Optional Text] oef_AverageAnnualReturnLabel Class I (incepted January 2, 2001)
Average Annual Return, Percent oef_AvgAnnlRtrPct 37.45%
Average Annual Return, Percent oef_AvgAnnlRtrPct 17.76%
Average Annual Return, Percent oef_AvgAnnlRtrPct 14.72%
Performance Inception Date oef_PerfInceptionDate Jan. 02, 2001
Technology 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 37.72%
Average Annual Return, Percent oef_AvgAnnlRtrPct 17.99%
Average Annual Return, Percent oef_AvgAnnlRtrPct 14.96%
Performance Inception Date oef_PerfInceptionDate May 02, 2011
[1] The investment adviser has agreed to waive 0.11% 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.