DWS Treasury Portfolio Annual Fund Operating Expenses - Institutional Shares [Member] - DWS Treasury Portfolio |
Jul. 28, 2026 |
|---|---|
| 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;">2027</span> |
| Institutional 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): | 0.24% |
| Expenses (as a percentage of Assets) | 0.29% |
| Fee Waiver or Reimbursement | (0.04%) |
| Net Expenses (as a percentage of Assets) | 0.25% |