DWS Treasury Portfolio Average Annual Total Returns - Investment Class Shares [Member] - Investment Class Shares - Return Before Taxes[Member] |
12 Months Ended | 60 Months Ended | 120 Months Ended | |
|---|---|---|---|---|
Mar. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2024 |
Dec. 31, 2024 |
|
| Prospectus [Line Items] | ||||
| Average Annual Return, Percent | 4.75% | 2.16% | 1.40% | |
| Performance Inception Date | May 21, 2007 |