State Street Institutional Treasury Plus 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 Plus Money Market Fund | Premier Class | ||||||||||
| Prospectus [Line Items] | ||||||||||
| Annual Return [Percent] | 4.24% | 5.23% | 5.06% | 1.61% | 0.02% | 0.40% | 2.12% | 1.75% | 0.77% | 0.19% |