DWS Government and Agency Securities Portfolio Average Annual Total Returns - DWS Gov Cash Inst Shares [Member] - DWS Government Cash Institutional Shares - Return Before Taxes[Member] |
12 Months Ended | 60 Months Ended | 120 Months Ended | |
|---|---|---|---|---|
Apr. 30, 2025 |
Dec. 31, 2024 |
Dec. 31, 2024 |
Dec. 31, 2024 |
|
| Prospectus [Line Items] | ||||
| Average Annual Return, Percent | 5.19% | 2.40% | 1.69% | |
| Performance Inception Date | Feb. 16, 2007 |