State Street Total Return VIS Fund Performance Management - Combo [Member] - State Street Total Return VIS Fund |
Dec. 31, 2025 |
|---|---|
| Prospectus [Line Items] | |
| Bar Chart and Performance Table [Heading] | <span style="color:#000000;font-family:Arial;font-size:10.02pt;font-weight:bold;">Performance</span> |
| Performance Narrative [Text Block] | The bar chart and table below provide some indication of the risks of investing in the Fund by illustrating the variability of the Fund's returns from year-to-year and by showing how the Fund's average annual returns for the periods indicated compared with that of three broad measures of market performance. The bar chart shows the performance of the Fund's Class 1 Shares. On August 1, 2018, the Fund changed to its current principal investment strategies. If the Fund's current principal investment strategies had been in place for these prior periods, performance information shown may have been different. The bar chart and average annual total returns table do not reflect the fees or charges imposed by the Accounts of the life insurance companies through which shares of the Fund may be purchased. If these fees and charges were included, returns would be lower than those shown. The Fund's past performance does not necessarily indicate how the Fund will perform in the future.Current performance information for the Fund is available toll free by calling (800)-242-0134 or by visiting our website at www.statestreet.com/im. |
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:Arial;font-size:10.02pt;">The Fund's past performance does not necessarily</span><span style="font-family:Arial;font-size:10.02pt;margin-left:0%;"> indicate how the Fund will perform in the future.</span> |
| Performance Information Illustrates Variability of Returns [Text] | <span style="font-family:Arial;font-size:10.02pt;margin-left:0%;">The bar chart and table below provide some indication of the risks of investing in the Fund by illustrating the variability of the Fund's returns from year-to-year and by showing how the Fund's average annual returns for the periods indicated compared with that of three broad measures of market performance. The bar chart shows the performance of the Fund's Class 1 Shares. On August 1, 2018, the Fund changed to its current principal investment strategies. If the Fund's current principal investment strategies had been in place for these prior periods, performance information shown may have been different. The bar chart and average annual total returns table do not reflect the fees or charges imposed by the Accounts of the life insurance companies through which shares of the Fund may be purchased. If these fees and charges were included, returns would be lower than those shown. </span> |
| Bar Chart [Heading] | <span style="color:#000000;font-family:Arial;font-size:10.02pt;font-weight:bold;">Annual Total Returns </span><span style="color:#000000;font-family:Arial;font-size:9.02pt;">(years ended 12/31)</span> |
| Bar Chart Closing [Text Block] | ReturnsQuarter/YearHighest Quarterly Return11.66%Q2 2020Lowest Quarterly Return-16.97%Q1 2020 |
| Performance Table Heading | <span style="font-family:Arial;font-size:10.02pt;font-weight:bold;">Average Annual Total Returns </span><span style="font-family:Arial;font-size:9.02pt;">(for periods ended 12/31/25)</span> |
| Performance Availability Website Address [Text] | <span style="font-family:Arial;font-size:10.02pt;">www.statestreet.com/im</span> |
| Performance Availability Phone [Text] | <span style="font-family:Arial;font-size:10.02pt;">(800)-242-0134</span> |
| Class 1 | |
| Prospectus [Line Items] | |
| Highest Quarterly Return, Label [Optional Text] | <span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;margin-left:0.0pt;">Highest Quarterly Return</span> |
| Highest Quarterly Return | 11.66% |
| Highest Quarterly Return, Date | Jun. 30, 2020 |
| Lowest Quarterly Return, Label [Optional Text] | <span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;margin-left:0.0pt;">Lowest Quarterly Return</span> |
| Lowest Quarterly Return | (16.97%) |
| Lowest Quarterly Return, Date | Mar. 31, 2020 |