SA JPMorgan Ultra-Short Bond Portfolio Performance Management - SA JPMorgan Ultra-Short Bond Portfolio |
Dec. 31, 2025 |
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| Prospectus [Line Items] | |
| Bar Chart and Performance Table [Heading] | <span style="color:#000000;font-family:Arial;font-size:12pt;font-style:italic;font-weight:bold;">Performance Information</span> |
| Performance Narrative [Text Block] | The following bar chart illustrates the risks of investing in the Portfolio by showing changes in the Portfolio’s performance from calendar year to calendar year and the table compares the Portfolio’s average annual returns to those of the Bloomberg U.S. Aggregate Bond Index (a broad-based securities market index) and the ICE BofA 3-Month US Treasury Bill Index, which is relevant to the Portfolio because it has characteristics similar to the Portfolio’s investment strategies. The Portfolio’s returns prior to April 29, 2024, as reflected in the bar chart and table, are the returns of the Portfolio when it followed different investment strategies under the name “SA DFA Ultra Short Bond Portfolio.” Fees and expenses incurred at the contract level are not reflected in the bar chart or table. If these amounts were reflected, returns would be less than those shown. Of course, past performance is not necessarily an indication of how the Portfolio will perform in the future.Effective April 29, 2024, J.P. Morgan Investment Management Inc. (“JPMorgan”) replaced Dimensional Fund Advisors LP (“DFA”) as subadviser to the Portfolio. Prior to April 29, 2024, DFA served as subadviser. Prior to May 1, 2016, the Portfolio was managed by SunAmerica. Prior to April 15, 2016, BofA Advisors, LLC served as subadviser. Performance for periods prior to May 1, 2016 reflects results when the Portfolio was managed as a money market fund. |
| Performance Past Does Not Indicate Future [Text] | <span style="color:#000000;font-family:Arial;font-size:10pt;"> Of course, past performance is not </span><span style="color:#000000;font-family:Arial;font-size:10pt;margin-left:0%;">necessarily an indication of how the Portfolio will perform </span><span style="color:#000000;font-family:Arial;font-size:10pt;">in the future.</span> |
| Performance Information Illustrates Variability of Returns [Text] | <span style="color:#000000;font-family:Arial;font-size:10pt;margin-left:0%;">The following bar chart illustrates the risks of investing in the Portfolio by showing changes in the Portfolio’s </span><span style="color:#000000;font-family:Arial;font-size:10pt;margin-left:0%;">performance from calendar year to calendar year and the table compares the Portfolio’s average annual returns to those of the Bloomberg U.S. Aggregate Bond Index (a broad-based securities market index) and the ICE BofA 3-Month US Treasury Bill Index, which is relevant to the Portfolio because it has characteristics similar to the Portfolio’s investment strategies. The Portfolio’s returns prior to April 29, 2024, as reflected in the bar chart and table, are the returns of the Portfolio when it followed different investment strategies under the name “SA DFA Ultra Short Bond Portfolio.”</span> |
| Bar Chart Does Not Reflect Sales Loads [Text] | <span style="color:#000000;font-family:Arial;font-size:10pt;"> Fees and expenses incurred </span><span style="color:#000000;font-family:Arial;font-size:10pt;margin-left:0%;">at the contract level are not reflected in the bar chart or table. If these amounts were reflected, returns would be less than those shown.</span> |
| Bar Chart [Heading] | <span style="font-family:Arial;font-size:10pt;font-weight:bold;">(Class 1 Shares)</span> |
| Bar Chart Closing [Text Block] | During the period shown in the bar chart:Highest Quarterly Return:September 30, 20241.65%Lowest Quarterly Return:March 31, 2022-1.25%Year to Date Most Recent Quarter:March 31, 20260.65% |
| Performance Table Heading | <span style="font-family:Arial;font-size:10pt;font-weight:bold;margin-left:0%;">Average Annual Total Returns</span><span style="font-family:Arial;font-size:10pt;"> (For the periods ended December 31, 2025)</span> |
| Class 1 | |
| Prospectus [Line Items] | |
| Year to Date Return, Label [Optional Text] | <span style="font-family:Arial;font-size:10pt;margin-left:0.0pt;">Year to Date Most </span><span style="font-family:Arial;font-size:10pt;margin-left:0.0pt;">Recent Quarter:</span> |
| Bar Chart, Year to Date Return | 0.65% |
| Bar Chart, Year to Date Return, Date | Mar. 31, 2026 |
| Highest Quarterly Return, Label [Optional Text] | <span style="font-family:Arial;font-size:10pt;margin-left:0.0pt;">Highest Quarterly </span><span style="font-family:Arial;font-size:10pt;margin-left:0.0pt;">Return:</span> |
| Highest Quarterly Return | 1.65% |
| Highest Quarterly Return, Date | Sep. 30, 2024 |
| Lowest Quarterly Return, Label [Optional Text] | <span style="font-family:Arial;font-size:10pt;margin-left:0.0pt;">Lowest Quarterly </span><span style="font-family:Arial;font-size:10pt;margin-left:0.0pt;">Return:</span> |
| Lowest Quarterly Return | (1.25%) |
| Lowest Quarterly Return, Date | Mar. 31, 2022 |