S000052307 [Member] 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 |
|
| UBS Prime Preferred Fund | UBS Prime Preferred Fund | |||||||||
| Prospectus [Line Items] | |||||||||
| Annual Return [Percent] | 4.27% | 5.25% | 5.17% | 1.67% | 0.02% | 0.56% | 2.25% | 1.93% | 1.02% |