DWS Treasury Portfolio Annual Fund Operating Expenses - Capital Shares [Member] - DWS Treasury Portfolio |
Mar. 31, 2025 |
|---|---|
| Prospectus [Line Items] | |
| Fee Waiver or Reimbursement over Assets, Date of Termination | <span style="font-family:Arial;font-size:10pt;">July 31, 2026</span> |
| Capital Shares | |
| Prospectus [Line Items] | |
| Management Fees (as a percentage of Assets) | 0.05% |
| Distribution and Service (12b-1) Fees | 0.00% |
| Other Expenses (as a percentage of Assets): | 0.28% |
| Expenses (as a percentage of Assets) | 0.33% |
| Fee Waiver or Reimbursement | (0.13%) |
| Net Expenses (as a percentage of Assets) | 0.20% |