DWS Tax-Exempt Portfolio Average Annual Total Returns - DWS Tax Free Mony Fund Cl S [Member] - DWS Tax-Free Money Fund Class S - 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 | 3.07% | 1.52% | 1.10% | |
| Performance Inception Date | Mar. 19, 2007 |