State Street Institutional Treasury Money Market Fund Annual Total Returns |
12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
Dec. 31, 2022 |
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
|
| State Street Institutional Treasury Money Market Fund | Premier Class | ||||||||||
| Prospectus [Line Items] | ||||||||||
| Annual Return [Percent] | 4.22% | 5.21% | 5.00% | 1.45% | 0.01% | 0.40% | 2.10% | 1.74% | 0.76% | 0.19% |