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May 01, 2025

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Investment Objective:

Expense [Heading]

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Fees and Expenses of the Portfolio

Shareholder Fees Caption [Text]

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Shareholder Fees (fees paid directly from your investment)

Fee Waiver or Reimbursement over Assets, Date of Termination

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April 30, 2026

Portfolio Turnover [Text Block]

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The Portfolio pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in annual fund operating expenses or in the Example, affect the Portfolio’s performance. During the most recent fiscal year, the Portfolio’s portfolio turnover rate was 383% of the average value of its portfolio.

Other Expenses, New Fund, Based on Estimates [Text]

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Based on estimated amounts for the current fiscal year.

Expense Example Narrative [Text Block]

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This Example is intended to help you compare the cost of investing in the Portfolio with the cost of investing in other portfolios. The Example assumes that you invest $10,000 in the Portfolio for the periods indicated, that your investment has a 5% return each year, that the Portfolio’s operating expenses remain the same, and that the Expense Limitation Arrangement is not renewed. This Example does not reflect any Contract-related fees and expenses including redemption fees (if any) at the Contract level. If such fees and expenses were reflected, the total expenses would be higher. Although your actual costs may be higher or lower, based on these assumptions, whether you redeem or hold your shares, your costs would be:

Strategy Narrative [Text Block]

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Under normal circumstances, the Portfolio invests at least 65% of its total assets in a diversified portfolio of Fixed Income Instruments of varying maturities, which may be represented by forwards or derivatives such as options, futures contracts, or swap agreements. “Fixed Income Instruments” include bonds (including 144A bonds), debt securities and other similar instruments issued by various U.S. and non-U.S. public- or private-sector entities. The Portfolio will not invest in the securities of any non-governmental issuer determined by the Sub-Adviser to be engaged principally in the manufacture of alcoholic beverages, tobacco products or military equipment, the operation of gambling casinos, the production or trade of pornographic materials, or in the oil industry, including extraction, production, and refining or the production or distribution of coal and coal fired generation. The Portfolio can invest in the securities of any issuer determined by the Sub-Adviser to be engaged principally in biofuel production, natural gas generation and sales and trading activities. Green/sustainable bonds from issuers involved in fossil fuel-related sectors may also be permitted. Labeled green bonds are those issues with proceeds specifically earmarked to be used for climate and environmental projects. Labeled green bonds are often verified by a third party, which certifies that the bond will fund projects that include environmental benefits. To the extent possible on the basis of information available to the Sub-Adviser, an issuer will be deemed to be principally engaged in an activity if it derives more than 10% of its gross revenues from such activities. In analyzing whether an issuer meets any of the criteria described above, the Sub-Adviser may rely upon, among other things, information provided by an independent third party. The Portfolio may avoid investment in the securities of issuers whose business practices with respect to the environment, social responsibility, and governance (“ESG practices”) are not to the Sub-Adviser’s satisfaction. In determining the efficacy of an issuer’s ESG practices, the Sub-Adviser will use its own proprietary assessments of material ESG issues and may also utilize standards as set forth by recognized global organizations, such as entities sponsored by the United Nations. For example, the Sub-Adviser may exclude issuers with histories of human rights violations or that receive low responsibility scores according to recognized international rights organizations. The Sub-Adviser also considers external data from issuers as aggregated by third party providers, including providers that specialize in certain types of data such as carbon, controversies, climate municipal securities, and sovereigns. Generally, the Sub-Adviser’s proprietary assessments involve assigning proprietary ESG scores to each issuer or issuance based on separate environmental-, social- and governance-related factors, which are customized based on the type of issuer or issuance. As examples, (i) the Sub-Adviser’s ESG framework for corporate issuers includes the evaluation of material environmental, social and governance factors reflective for each sector and a relative weighting of such factors based on differences in industry dynamics; (ii) the Sub-Adviser’s ESG framework for fixed-income securities issued by U.S. and non-U.S. governments includes an evaluation of whether the issuers of such securities align with the Portfolio’s government-specific ESG criteria; and (iii) the Sub-Adviser’s ESG framework for mortgage-related securities includes an evaluation of the underlying pools, which are scored on a proprietary scoring model that seeks to prioritize mortgage-related securities with underlying pools with stronger social and governance characteristics. In general, the Portfolio will seek to avoid investments in issuers that score materially below the average issuer according to the Sub-Adviser’s ESG research and assessment. ESG scores are updated regularly. The factors and processes used to determine ESG scores are expected to develop over time and involve the considerations of criteria deemed relevant by the Sub-Adviser. Additionally, the Sub-Adviser may engage proactively with issuers to encourage them to improve their business practices with respect to ESG practices and to help drive deeper sustainability commitments from issuers, including supporting their transition to become best-in-class. The Sub-Adviser’s activities in this respect may include, but are not limited to, direct dialogue with company management, such as through in-person meetings, phone calls, electronic communications, and letters. Through these engagement activities, the Sub-Adviser seeks to identify opportunities for a company to improve its ESG practices, and will endeavor to work collaboratively with company management to establish concrete objectives and to develop a plan for meeting these objectives. The Portfolio may invest in securities of issuers whose ESG practices are currently suboptimal, with the expectation that these practices may improve over time either as a result of the Sub-Adviser’s engagement efforts or through the company’s own initiatives. There can be no assurance that these engagement efforts will be successful. The Sub-Adviser may also exclude those issuers that are not receptive to the Sub-Adviser’s engagement efforts, as determined in the Sub-Adviser’s sole discretion. In addition, because the Portfolio invests primarily in Fixed Income Instruments, which are typically non-voting securities, the Portfolio does not generally have standing to engage companies in all the ways that an investor in an issuer’s equity voting securities does. The Portfolio invests primarily in investment-grade debt securities, but may invest up to 20% of its total assets in high yield securities, also known as “junk bonds,” as rated by Moody’s Investors Service, Inc. (“Moody’s”), Standard & Poor’s Global Rating (“S&P”) or Fitch, Inc. (“Fitch”), or, if unrated, as determined by the Adviser or the Sub-Adviser. The Portfolio also may invest up to 30% of its total assets in securities denominated in foreign currencies and may invest beyond this limit in U.S. dollar-denominated securities of foreign issuers. The Portfolio may invest up to 15% of its total assets in securities and instruments that are economically tied to emerging market countries (this limitation does not apply to investment grade sovereign debt denominated in the local currency with less than one year remaining to maturity, which means the Portfolio may invest, together with any other investments denominated in foreign currencies, up to 30% of its total assets in such instruments). The Portfolio will normally limit its foreign currency exposure (from non-U.S. dollar-denominated securities or currencies) to 20% of its total assets. Subject to applicable law and any other restrictions described in the Portfolio’s Prospectus or Statement of Additional Information, the Portfolio may invest without limitation in derivative instruments, such as options, futures contracts or swap agreements, or in mortgage- or asset-backed securities. The Portfolio may invest in derivatives, such as credit default swaps, on securities indexes that may include exposure to issuers that the Portfolio is not permitted to invest in directly. The Portfolio’s investments in derivatives may be deemed to involve the use of leverage because the Portfolio is not required to invest the full market value of the contract upon entering into the contract but participates in gains and losses on the full contract price. The use of derivatives also may be deemed to involve the use of leverage because the heightened price sensitivity of some derivatives to market changes may magnify the Portfolio’s gain or loss. It is not expected, however, that the Portfolio will be leveraged by borrowing money for investment purposes. The Portfolio’s investments in derivatives may require it to maintain a percentage of its assets in cash, cash equivalent instruments or other liquid assets to serve as margin or collateral for the Portfolio’s obligations under derivative transactions. The Portfolio may, without limitation, seek to obtain market exposure to the securities in which it primarily invests by entering into a series of purchase and sale contracts or by using other investment techniques (such as “sale-buyback” or “dollar roll” transactions). In sale-buyback and dollar roll transactions, the Portfolio sells a security to another party and simultaneously agrees to repurchase the same security (in the case of a sale-buyback) or a similar, but not the same, security (in the case of a dollar roll) on a specified date and pre-determined price. The Portfolio may purchase or sell securities on a when-issued, delayed delivery or forward commitment basis (including on a “TBA” (to be announced) basis) and may engage in short sales. With TBA transactions, the particular securities to be delivered are not identified at the trade date, but the delivered securities must meet specified terms and standards (such as yield, duration, and credit quality). The Portfolio may also invest up to 10% of its total assets in preferred securities, convertible securities and other equity-related securities. The “total return” sought by the Portfolio consists of income earned on the Portfolio’s investments, plus capital appreciation, if any, which generally arises from decreases in interest rates, foreign currency appreciation, or improving credit fundamentals for a particular sector or security. Duration is a measure used to determine the sensitivity of a security’s price to changes in interest rates. The longer a security’s duration, the more sensitive it will be to changes in interest rates, which may increase the volatility of the security’s value and may lead to losses. The average portfolio duration of the Portfolio normally varies within two years (plus or minus) of the portfolio duration of the securities comprising the Bloomberg U.S. Aggregate Bond Index, as calculated by the Sub-Adviser, which as of December 31, 2024, was 6.08 years.

Bar Chart and Performance Table [Heading]

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Risk/Return Bar Chart and Table

Performance Information Illustrates Variability of Returns [Text]

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The bar chart and table below provide some indication of the risks of investing in the Portfolio by showing changes in the Portfolio’s performance from year to year and by showing how the Portfolio’s average annual total returns for the past one-year, five-year and since inception periods through December 31, 2024, compared to the returns of a broad-based securities market index.

Performance Past Does Not Indicate Future [Text]

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Past performance is not an indication of future performance.

Bar Chart Does Not Reflect Sales Loads [Text]

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The performance results do not reflect any Contract-related fees and expenses, which would reduce the performance results.

Performance Table Heading

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Average Annual Total Returns