Investment Strategy - U.S. LARGE COMPANY PORTFOLIO	Oct. 31, 2025
Prospectus [Line Items]
Strategy [Heading]	Principal Investment Strategies
Strategy Narrative [Text Block]	The U.S. Large Company Portfolio generally invests in the stocks that comprise the S&P 500^® Index in approximately the proportions they are represented in the S&P 500^® Index. The S&P 500^® Index comprises a broad and diverse group of stocks. Generally, these are the U.S. stocks with the largest market capitalizations and, as a group, they generally represent approximately 80% of the total market capitalization of all publicly traded U.S. stocks. For the Portfolio, the Advisor considers the stocks that comprise the S&P 500^® Index to be those of large companies. Under normal market conditions, at least 95% of the Portfolio’s net assets will be invested in the stocks that comprise the S&P 500^® Index. As a non-fundamental policy, under normal circumstances, the Portfolio will invest at least 80% of its net assets in securities of large U.S. companies. Ordinarily, portfolio companies will not be sold except to reflect additions or deletions of the companies that comprise the S&P 500^® Index, including as a result of mergers, reorganizations and similar transactions and, to the extent necessary, to provide cash to pay redemptions of the U.S. Large Company Portfolio’s shares. Given the impact on prices of securities affected by the reconstitution of the S&P 500^® Index around the time of a reconstitution date, the Portfolio may purchase or sell securities that may be impacted by the reconstitution before or after the reconstitution date of the S&P 500^® Index. In seeking to approximate the total investment return of the S&P 500^® Index, the Advisor may also adjust the representation of securities in the Portfolio after considering such securities’ characteristics and other factors the Advisor determines to be appropriate. The U.S. Large Company Portfolio may purchase or sell futures contracts and options on futures contracts for U.S. equity securities and indices to increase or decrease equity market exposure based on actual or expected cash inflows to or outflows from the Portfolio. The U.S. Large Company Portfolio may lend its portfolio securities to generate additional income. The U.S. Large Company Portfolio intends to be “diversified,” as defined in the Investment Company Act of 1940, as amended (the “1940 Act”), to the extent that the S&P 500^® Index is diversified. The Portfolio may become “non-diversified” as defined in the 1940 Act solely as a result of a change in relative market capitalization or index weighting of one or more constituents of the S&P 500^® Index. Should the Portfolio become “non-diversified,” it will no longer be required to meet certain diversification requirements under the 1940 Act and may invest a greater portion of its assets in securities of a small group of issuers or in any one individual issuer than can a diversified fund. Shareholder approval will not be sought when the Portfolio crosses from diversified to non-diversified status solely due to a change in relative market capitalization or index weighting of one or more constituents of the S&P 500^® Index. About the S&P 500^® Index: The Standard & Poor’s 500 Composite Stock Price Index^® is market capitalization weighted (adjusted for free float). Its performance is usually cyclical because it reflects periods when stock prices generally rise or fall. For information concerning S&P Global Ratings, a division of The McGraw Hill Companies (“S&P”), and disclaimers of S&P with respect to the U.S. Large Company Portfolio, see “Standard & Poor’s—Information and Disclaimers.”

Investment Strategy - U.S. LARGE COMPANY PORTFOLIO

Oct. 31, 2025

Principal Investment Strategies

The U.S. Large Company Portfolio generally invests in the stocks that comprise the S&P 500^® Index in approximately the proportions they are represented in the S&P 500^® Index. The S&P 500^® Index comprises a broad and diverse group of stocks. Generally, these are the U.S. stocks with the largest market capitalizations and, as a group, they generally represent approximately 80% of the total market capitalization of all publicly traded U.S. stocks. For the Portfolio, the Advisor considers the stocks that comprise the S&P 500^® Index to be those of large companies. Under normal market conditions, at least 95% of the Portfolio’s net assets will be invested in the stocks that comprise the S&P 500^® Index. As a non-fundamental policy, under normal circumstances, the Portfolio will invest at least 80% of its net assets in securities of large U.S. companies.

Ordinarily, portfolio companies will not be sold except to reflect additions or deletions of the companies that comprise the S&P 500^® Index, including as a result of mergers, reorganizations and similar transactions and, to the extent necessary, to provide cash to pay redemptions of the U.S. Large Company Portfolio’s shares. Given the impact on prices of securities affected by the reconstitution of the S&P 500^® Index around the time of a reconstitution date, the Portfolio may purchase or sell securities that may be impacted by the reconstitution before or after the reconstitution date of the S&P 500^® Index. In seeking to approximate the total investment return of the S&P 500^® Index, the Advisor may also adjust the representation of securities in the Portfolio after considering such securities’ characteristics and other factors the Advisor determines to be appropriate.

The U.S. Large Company Portfolio may purchase or sell futures contracts and options on futures contracts for U.S. equity securities and indices to increase or decrease equity market exposure based on actual or expected cash inflows to or outflows from the Portfolio.

The U.S. Large Company Portfolio may lend its portfolio securities to generate additional income.

The U.S. Large Company Portfolio intends to be “diversified,” as defined in the Investment Company Act of 1940, as amended (the “1940 Act”), to the extent that the S&P 500^® Index is diversified. The Portfolio may become “non-diversified” as defined in the 1940 Act solely as a result of a change in relative market capitalization or index weighting of one or more constituents of the S&P 500^® Index. Should the Portfolio become “non-diversified,” it will no longer be required to meet certain diversification requirements under the 1940 Act and may invest a greater portion of its assets in securities of a small group of issuers or in any one individual issuer than can a diversified fund. Shareholder approval will not be sought when the Portfolio crosses from diversified to non-diversified status solely due to a change in relative market capitalization or index weighting of one or more constituents of the S&P 500^® Index.

About the S&P 500^® Index: The Standard & Poor’s 500 Composite Stock Price Index^® is market capitalization weighted (adjusted for free float). Its performance is usually cyclical because it reflects periods when stock prices generally rise or fall. For information concerning S&P Global Ratings, a division of The McGraw Hill Companies (“S&P”), and disclaimers of S&P with respect to the U.S. Large Company Portfolio, see “Standard & Poor’s—Information and Disclaimers.”