Equity Income Portfolio Investment Strategy - Equity Income Portfolio	Dec. 31, 2025
Prospectus [Line Items]
Strategy [Heading]	<span style="color:#000000;font-family:Arial;font-size:10.02pt;font-weight:bold;">PRINCIPAL INVESTMENT STRATEGIES</span>
Strategy Narrative [Text Block]	Normally, the Portfolio invests at least 80% of net assets (plus any borrowings for investment purposes) in stocks with a track record of paying dividends. The adviser considers a security to have a track record of paying dividends if the security has paid a dividend within the past 12 months. The Portfolio generally seeks investments in large-capitalization companies, which it considers to be those companies with a market capitalization greater than $5 billion. Additionally, the Portfolio’s yield, which reflects the level of dividends paid by the Portfolio, is expected to normally exceed the yield of the Russell 1000® Value Index. This level is merely a guideline and there can be no certainty this level will be achieved. The Portfolio will typically employ a value approach in selecting investments. The adviser’s in-house research team seeks to identify companies that appear to be undervalued as measured by price to earnings ratio, dividend yield, enterprise value to sales, among other metrics and may be temporarily out of favor, but have good prospects for capital appreciation and dividend growth. While the Portfolio does not seek to focus its investments in any particular economic sector, the Portfolio may at times have a relatively high percentage of its assets invested in a particular sector as a result of the adviser’s stock selection process.While most assets will be invested in U.S. common stocks, the Portfolio may also invest in foreign securities and American Depositary Receipts (ADRs) (up to 20% of net assets), including those of issuers located in emerging markets. The Portfolio may also invest in real estate investment trusts (REITs). The Portfolio may sell securities for a variety of reasons such as to secure gains, limit losses, or redeploy assets into more promising opportunities.

Equity Income Portfolio Investment Strategy - Equity Income Portfolio

Dec. 31, 2025

<span style="color:#000000;font-family:Arial;font-size:10.02pt;font-weight:bold;">PRINCIPAL INVESTMENT STRATEGIES</span>

Strategy Narrative [Text Block]

Normally, the Portfolio invests at least 80% of net assets (plus any borrowings for investment purposes) in stocks with a track record of paying dividends. The adviser considers a security to have a track record of paying dividends if the security has paid a dividend within the past 12 months. The Portfolio generally seeks investments in large-capitalization companies, which it considers to be those companies with a market capitalization greater than $5 billion. Additionally, the Portfolio’s yield, which reflects the level of dividends paid by the Portfolio, is expected to normally exceed the yield of the Russell 1000® Value Index. This level is merely a guideline and there can be no certainty this level will be achieved. The Portfolio will typically employ a value approach in selecting investments. The adviser’s in-house research team seeks to identify companies that appear to be undervalued as measured by price to earnings ratio, dividend yield, enterprise value to sales, among other metrics and may be temporarily out of favor, but have good prospects for capital appreciation and dividend growth. While the Portfolio does not seek to focus its investments in any particular economic sector, the Portfolio may at times have a relatively high percentage of its assets invested in a particular sector as a result of the adviser’s stock selection process.While most assets will be invested in U.S. common stocks, the Portfolio may also invest in foreign securities and American Depositary Receipts (ADRs) (up to 20% of net assets), including those of issuers located in emerging markets. The Portfolio may also invest in real estate investment trusts (REITs). The Portfolio may sell securities for a variety of reasons such as to secure gains, limit losses, or redeploy assets into more promising opportunities.