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 |
|
| Tax Free Investment Class [Member] | DWS Tax-Exempt Portfolio | Tax-Free Investment Class | ||||||||||
| Prospectus [Line Items] | ||||||||||
| Annual Return [Percent] | 2.73% | 2.73% | 0.78% | 0.01% | 0.32% | 0.94% | 0.84% | 0.22% | 0.11% | 0.02% |