DWS Treasury Portfolio Expense Example - DWS US Trsy Money Fund Cl S [Member] - DWS Treasury Portfolio - DWS U.S. Treasury Money Fund Class S	Jul. 28, 2026 USD ($)
Prospectus [Line Items]
Expense Example, with Redemption, 1 Year	$ 32
Expense Example, with Redemption, 3 Years	100
Expense Example, with Redemption, 5 Years	174
Expense Example, with Redemption, 10 Years	$ 393

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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