SA AB Growth Portfolio Investment Strategy - SA AB Growth Portfolio	Dec. 31, 2025
Prospectus [Line Items]
Strategy [Heading]	<span style="color:#000000;font-family:Arial;font-size:12pt;font-style:italic;font-weight:bold;">Principal Investment Strategies of the Portfolio</span>
Strategy Narrative [Text Block]	The Portfolio attempts to achieve its investment goal by investing primarily in equity securities of a limited number of large, carefully selected, high quality U.S. companies that are judged likely to achieve superior long-term earnings growth. The Portfolio may also invest up to 25% of its assets in foreign securities, including emerging market securities. The subadviser’s investment process is driven by bottom-up stock selection. Generally, the subadviser constructs a portfolio of approximately 45 to 60 stocks using a disciplined team approach, while at the same time drawing on the unique ideas of each portfolio manager. Purchase candidates are generally leaders in their industries, with compelling business models, talented management teams and growth prospects that the subadviser deems to be superior to consensus expectations over coming quarters. Stock selection is the primary driver of investment decisions, with all other decisions purely a by-product of the stock-selection process. The subadviser believes that investment success comes from focusing on companies poised to exceed consensus growth expectations on the upside. As a result, the Portfolio tends to exhibit strong earnings growth relative to consensus and to the benchmark as a whole, which typically results in attractive valuations.

SA AB Growth Portfolio Investment Strategy - SA AB Growth Portfolio

Dec. 31, 2025

<span style="color:#000000;font-family:Arial;font-size:12pt;font-style:italic;font-weight:bold;">Principal Investment Strategies of the Portfolio</span>

Strategy Narrative [Text Block]

The Portfolio attempts to achieve its investment goal by investing primarily in equity securities of a limited number of large, carefully selected, high quality U.S. companies that are judged likely to achieve superior long-term earnings growth. The Portfolio may also invest up to 25% of its assets in foreign securities, including emerging market securities. The subadviser’s investment process is driven by bottom-up stock selection. Generally, the subadviser constructs a portfolio of approximately 45 to 60 stocks using a disciplined team approach, while at the same time drawing on the unique ideas of each portfolio manager. Purchase candidates are generally leaders in their industries, with compelling business models, talented management teams and growth prospects that the subadviser deems to be superior to consensus expectations over coming quarters. Stock selection is the primary driver of investment decisions, with all other decisions purely a by-product of the stock-selection process. The subadviser believes that investment success comes from focusing on companies poised to exceed consensus growth expectations on the upside. As a result, the Portfolio tends to exhibit strong earnings growth relative to consensus and to the benchmark as a whole, which typically results in attractive valuations.