DWS Tax-Exempt Portfolio Annual Total Returns |
12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2024 |
Dec. 31, 2023 |
Dec. 31, 2022 |
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| DWS Tax Expt Cash Prmr Shrs [Member] | DWS Tax-Exempt Portfolio | DWS Tax-Exempt Cash Premier Shares | ||||||||||
| Prospectus [Line Items] | ||||||||||
| Annual Return [Percent] | 3.14% | 3.13% | 1.07% | 0.01% | 0.47% | 1.32% | 1.23% | 0.69% | 0.38% | 0.02% |