DWS Treasury Portfolio Average Annual Total Returns - Capital Shares [Member] - Capital Shares - Return Before Taxes[Member] |
12 Months Ended | 60 Months Ended | 107 Months Ended | |
|---|---|---|---|---|
Mar. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2024 |
Dec. 31, 2024 |
|
| Prospectus [Line Items] | ||||
| Average Annual Return, Percent | 5.12% | 2.37% | 1.87% | |
| Performance Inception Date | Feb. 01, 2016 |