S000052307 [Member] Average Annual Total Returns - UBS Prime Preferred Fund |
12 Months Ended | 60 Months Ended | 119 Months Ended | 120 Months Ended |
|---|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2025 |
|
| Prospectus [Line Items] | ||||
| Average Annual Return, Percent | 4.27% | 3.25% | 2.25% | |
| Performance Inception Date | Jan. 19, 2016 |