S000018677 [Member] Average Annual Total Returns |
12 Months Ended | 60 Months Ended | 120 Months Ended |
|---|---|---|---|
Dec. 31, 2024 |
Dec. 31, 2024 |
Dec. 31, 2024 |
|
| UBS Select Treasury Preferred Fund | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 5.13% | 2.38% | 1.67% |