DWS Tax-Exempt Portfolio Annual Fund Operating Expenses - Tax Free Investment Class [Member] - DWS Tax-Exempt Portfolio |
Apr. 30, 2025 |
|---|---|
| Prospectus [Line Items] | |
| Fee Waiver or Reimbursement over Assets, Date of Termination | <span style="font-family:Arial;font-size:10pt;"> July 31, </span><span style="font-family:Arial;font-size:10pt;">2026</span> |
| Tax-Free Investment Class | |
| Prospectus [Line Items] | |
| Management Fees (as a percentage of Assets) | 0.07% |
| Distribution and Service (12b-1) Fees | 0.25% |
| Other Expenses (as a percentage of Assets): | 0.46% |
| Expenses (as a percentage of Assets) | 0.78% |
| Fee Waiver or Reimbursement | (0.06%) |
| Net Expenses (as a percentage of Assets) | 0.72% |