Performance Management - Elfun Trusts |
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 those of a broad measure of market performance. 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 those of a broad measure of market performance. </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 Return22.90%Q2 2020Lowest Quarterly Return-16.96%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 Table Narrative | After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. After-tax returns depend on an investor's tax situation and may differ from those shown above, and after-tax returns are not relevant to investors who hold their shares through tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts (“IRAs”).The returns after taxes can exceed the returns before taxes due to an assumed tax benefit for a shareholder from realizing a capital loss on a sale of Fund shares. |
| Performance Table Uses Highest Federal Rate | <span style="color:#000000;font-family:Arial;font-size:10.02pt;margin-left:0%;">After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. </span> |
| Performance Table Not Relevant to Tax Deferred | <span style="color:#000000;font-family:Arial;font-size:10.02pt;">After-tax returns depend on an investor's tax situation and may differ from those </span><span style="color:#000000;font-family:Arial;font-size:10.02pt;margin-left:0%;">shown above, and after-tax returns are not relevant to investors who hold their shares through tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts (</span><span style="color:#000000;font-family:Arial;font-size:10.02pt;">“IRAs”).</span> |
| Performance Table Explanation after Tax Higher | <span style="color:#000000;font-family:Arial;font-size:10.02pt;">The returns after taxes can exceed the returns </span><span style="color:#000000;font-family:Arial;font-size:10.02pt;">before taxes due to an assumed tax benefit for a shareholder from realizing a capital loss on a sale of Fund shares.</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> |
| Elfun Trusts | |
| 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 | 22.90% |
| 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 | (16.96%) |
| Lowest Quarterly Return, Date | Mar. 31, 2020 |