Equity Income Portfolio Investment Strategy - Portfolio [Member] - Equity Income Portfolio	Dec. 31, 2025
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 common stocks of mid-size and large companies whose stocks typically pay above-average levels of dividend income and are, in the opinion of the purchasing advisor, undervalued relative to similar stocks. In addition, the Fund generally invests in companies believed to be committed to paying consistent dividends. Under normal circumstances, the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in equity securities. For purposes of the 80% policy, equity securities include common stocks, preferred stocks, warrants to purchase common stocks and preferred stocks, depositary receipts, and other securities with equity characteristics. The Fund uses multiple investment advisors, each of which independently selects and maintains a portfolio of common stocks for the Fund.

Equity Income Portfolio Investment Strategy - Portfolio [Member] - Equity Income Portfolio

Dec. 31, 2025

<span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;">Principal Investment Strategies</span>

The Fund employs an active management approach, investing mainly in common stocks of mid-size and large companies whose stocks typically pay above-average levels of dividend income and are, in the opinion of the purchasing advisor, undervalued relative to similar stocks. In addition, the Fund generally invests in companies believed to be committed to paying consistent dividends. Under normal circumstances, the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in equity securities. For purposes of the 80% policy, equity securities include common stocks, preferred stocks, warrants to purchase common stocks and preferred stocks, depositary receipts, and other securities with equity characteristics. The Fund uses multiple investment advisors, each of which independently selects and maintains a portfolio of common stocks for the Fund.