S000052306 [Member] Average Annual Total Returns - UBS Prime Reserves Fund |
12 Months Ended | 60 Months Ended | 119 Months Ended |
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2025 |
|
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 4.23% | 3.21% | 2.21% |
| Performance Inception Date | Jan. 19, 2016 |