DWS Tax-Exempt Portfolio Annual Fund Operating Expenses - Tax Exempt Cash Managed Shares [Member] - DWS Tax-Exempt Portfolio - Tax-Exempt Cash Managed Shares |
Apr. 30, 2025 |
|---|---|
| Prospectus [Line Items] | |
| Management Fees (as a percentage of Assets) | 0.07% |
| Distribution and Service (12b-1) Fees | 0.15% |
| Other Expenses (as a percentage of Assets): | 0.31% |
| Expenses (as a percentage of Assets) | 0.53% |