Diversified Value Portfolio Investment Strategy - Portfolio [Member] - Diversified Value Portfolio |
Dec. 31, 2025 |
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| Prospectus [Line Items] | |
| Strategy [Heading] | <span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;">Principal Investment Strategies</span> |
| Strategy Narrative [Text Block] | The Fund employs an active management approach, investing mainly in large- and mid-capitalization U.S. companies whose stocks are considered by an advisor to be undervalued. Undervalued stocks are generally those that are out of favor with investors and that an advisor believes are trading at prices that are below average in relation to measures such as earnings and book value. These stocks often have above-average dividend yields. The Fund has multiple advisors, each of which independently selects and maintains a portfolio of common stocks for the Fund. |