Investment Strategy - Disciplined U.S. Value Equity Portfolio	Oct. 31, 2025
Prospectus [Line Items]
Strategy [Heading]	Principal Investment Strategy
Strategy Narrative [Text Block]	Using factor-based analysis, under normal market circumstances, the Portfolio invests at least 80% of the value of its net assets (including borrowings for investment purposes) in income-producing common stocks of large cap companies tied economically to the U.S. The Advisor considers a company to be tied economically to the U.S. if the company: 1) is organized under the laws of the U.S., 2) maintains its principal place of business in the U.S., 3) is traded principally in the U.S. or 4) at the time of purchase, is included in a U.S. equity index managed by S&P Global Ratings (“S&P”) or FTSE Russell (“Russell”). Large cap companies include companies with market capitalizations, at the time of purchase, within the market capitalization range of any stock in the Russell 1000^® Value Index. That capitalization range was $1.3 billion to $3.8 trillion as of December 31, 2025. The Advisor uses proprietary multi-factor computer models to select stocks that the models identify as undervalued. These computer models rank securities based on certain criteria, including price in relation to earnings, cash flow and assets, and material sustainability-related criteria. In addition, the Portfolio will limit its selection universe to stocks with a material dividend yield at the time of purchase. As sustainability-related information is just one investment criterion, sustainability-related considerations are generally not solely determinative in any investment decision made by the Advisor. The Portfolio may actively trade its securities to achieve its principal investment strategies.

Using factor-based analysis, under normal market circumstances, the Portfolio invests at least 80% of the value of its net assets (including borrowings for investment purposes) in income-producing common stocks of large cap companies tied economically to the U.S. The Advisor considers a company to be tied economically to the U.S. if the company: 1) is organized under the laws of the U.S., 2) maintains its principal place of business in the U.S., 3) is traded principally in the U.S. or 4) at the time of purchase, is included in a U.S. equity index managed by S&P Global Ratings (“S&P”) or FTSE Russell (“Russell”). Large cap companies include companies with market capitalizations, at the time of purchase, within the market capitalization range of any stock in the Russell 1000^® Value Index. That capitalization range was $1.3 billion to $3.8 trillion as of December 31, 2025.

The Advisor uses proprietary multi-factor computer models to select stocks that the models identify as undervalued. These computer models rank securities based on certain criteria, including price in relation to earnings, cash flow and assets, and material sustainability-related criteria. In addition, the Portfolio will limit its selection universe to stocks with a material dividend yield at the time of purchase. As sustainability-related information is just one investment criterion, sustainability-related considerations are generally not solely determinative in any investment decision made by the Advisor. The Portfolio may actively trade its securities to achieve its principal investment strategies.