SA BlackRock Advantage International Portfolio Performance Management - SA BlackRock Advantage International Portfolio |
Dec. 31, 2025 |
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| Prospectus [Line Items] | |
| Bar Chart and Performance Table [Heading] | <span style="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 MSCI EAFE® Index (net) (a broad-based securities market 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 30, 2026, as reflected in the bar chart and table, are the returns of the Portfolio when it followed different investment strategies under the name “SA Morgan Stanley International Equities 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.BlackRock Investment Management, LLC (“BlackRock”) assumed subadvisory duties of the Portfolio on April 30, 2026. Prior to April 30, 2026, Morgan Stanley Investment Management Inc. subadvised the Portfolio, and Morgan Stanley Investment Management Limited served as sub-subadviser. |
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:Arial;font-size:10pt;"> Of course, past </span><span style="font-family:Arial;font-size:10pt;margin-left:0%;">performance is not necessarily an indication of how the </span><span style="font-family:Arial;font-size:10pt;">Portfolio will perform in the future.</span> |
| Performance Information Illustrates Variability of Returns [Text] | <span style="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 performance from calendar year to calendar year and the table compares the Portfolio’s average annual returns to those of the MSCI EAFE</span><span style="font-family:Arial;font-size:6.5pt;position:relative;top:-3.25pt;">®</span><span style="font-family:Arial;font-size:10pt;"> Index (net) (a broad-based </span><span style="font-family:Arial;font-size:10pt;margin-left:0%;">securities market 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 30, 2026, as reflected in the bar chart and table, are the returns of the Portfolio when it followed different investment strategies under the name “SA Morgan Stanley International Equities Portfolio.“ </span> |
| Bar Chart Does Not Reflect Sales Loads [Text] | <span style="font-family:Arial;font-size:10pt;">Fees and </span><span style="font-family:Arial;font-size:10pt;margin-left:0%;">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.</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:December 31, 202218.44%Lowest Quarterly Return:March 31, 2020-19.96%Year to Date Most Recent Quarter:March 31, 2026-3.30% |
| 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 | (3.30%) |
| 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 | 18.44% |
| Highest Quarterly Return, Date | Dec. 31, 2022 |
| 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 | (19.96%) |
| Lowest Quarterly Return, Date | Mar. 31, 2020 |