000000 - Document - Document and Entity Information
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000011 - Document - Risk/Return Summary {Unlabeled} - DWS RREEF Real Estate Securities Income Fund
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000012 - Schedule - Shareholder Fees {- DWS RREEF Real Estate Securities Income Fund}
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000013 - Schedule - Annual Fund Operating Expenses {- DWS RREEF Real Estate Securities Income Fund}
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000014 - Schedule - Expense Example {- DWS RREEF Real Estate Securities Income Fund}
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000015 - Schedule - Expense Example, No Redemption {- DWS RREEF Real Estate Securities Income Fund}
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000016 - Schedule - Annual Total Returns - DWS RREEF Real Estate Securities Income Fund [BarChart]
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000017 - Schedule - Average Annual Total Returns {Transposed} {- DWS RREEF Real Estate Securities Income Fund}
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000018 - Document - Risk/Return Detail {Unlabeled} - DWS RREEF Real Estate Securities Income Fund
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000019 - Disclosure - Risk/Return Detail Data {Elements} - DWS RREEF Real Estate Securities Income Fund
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