DWS RREEF Completion Fund I Performance Management - DWS RREEF Completion Fund I	Mar. 31, 2025
Prospectus [Line Items]
Bar Chart and Performance Table [Heading]	<span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;text-transform:uppercase;">Past Performance</span>
Performance Narrative [Text Block]	Since the fund is newly offered, performance information is not available. When performance information is available it can show how a fund's returns vary from year to year and can give an idea of its risk; so can comparing fund performance to market performance as measured by one or more indexes. Past performance may not indicate future results. The Advisor does not charge a management fee to the fund. Shareholders should be aware, however, that the fund is part of SMA investment programs, and the fund's subadvisor will be compensated directly or indirectly by wrap program sponsors or wrap account clients for SMA advisory services. If the Advisor charged the fund a management fee instead of the compensation paid by wrap program sponsors or wrap account clients to the subadvisor, the fund’s performance would be lower.
Performance Past Does Not Indicate Future [Text]	<span style="font-family:Arial;font-size:10pt;"> Past performance may not indicate future </span><span style="font-family:Arial;font-size:10pt;">results.</span>
Performance Information Illustrates Variability of Returns [Text]	<span style="font-family:Arial;font-size:10pt;"> When performance information is available </span><span style="font-family:Arial;font-size:10pt;">it can show how a fund's returns vary from year to year and can give an idea of its risk; so can comparing fund performance to market performance as measured by one or more indexes.</span>
Performance One Year or Less [Text]	<span style="font-family:Arial;font-size:10pt;">Since the fund is newly offered, performance information is not available.</span>