110001 - Disclosure - DWS S&P 500 Index Fund Investment Objectives and Goals link:presentationLink link:definitionLink link:calculationLink 110002 - Disclosure - DWS S&P 500 Index Fund Fees and Expenses link:presentationLink link:definitionLink link:calculationLink 110003 - Disclosure - DWS S&P 500 Index Fund Investment Strategy link:presentationLink link:definitionLink link:calculationLink 110004 - Disclosure - DWS S&P 500 Index Fund Investment Risks link:presentationLink link:definitionLink link:calculationLink 110005 - Disclosure - DWS S&P 500 Index Fund Performance Management link:presentationLink link:definitionLink link:calculationLink 120010 - Disclosure - DWS S&P 500 Index Fund Shareholder Fees link:presentationLink link:definitionLink link:calculationLink 120020 - Disclosure - DWS S&P 500 Index Fund Annual Fund Operating Expenses link:presentationLink link:definitionLink link:calculationLink 120030 - Disclosure - DWS S&P 500 Index Fund Expense Example link:presentationLink link:definitionLink link:calculationLink 120040 - Disclosure - DWS S&P 500 Index Fund Expense Example, No Redemption link:presentationLink link:definitionLink link:calculationLink 120045 - Disclosure - DWS S&P 500 Index Fund Risks Data link:presentationLink link:definitionLink link:calculationLink 120050 - Disclosure - DWS S&P 500 Index Fund Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 120060 - Disclosure - DWS S&P 500 Index Fund Average Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 120070 - Disclosure - DWS S&P 500 Index Fund Market Index Performance link:presentationLink link:definitionLink link:calculationLink 110000 - Disclosure - DWS S&P 500 Index Fund N-1A Cover link:presentationLink link:definitionLink link:calculationLink 210001 - Disclosure - DWS Equity 500 Index Fund Investment Objectives and Goals link:presentationLink link:definitionLink link:calculationLink 210002 - Disclosure - DWS Equity 500 Index Fund Fees and Expenses link:presentationLink link:definitionLink link:calculationLink 210003 - Disclosure - DWS Equity 500 Index Fund Investment Strategy link:presentationLink link:definitionLink link:calculationLink 210004 - Disclosure - DWS Equity 500 Index Fund Investment Risks link:presentationLink link:definitionLink link:calculationLink 210005 - Disclosure - DWS Equity 500 Index Fund Performance Management link:presentationLink link:definitionLink link:calculationLink 220010 - Disclosure - DWS Equity 500 Index Fund Shareholder Fees link:presentationLink link:definitionLink link:calculationLink 220020 - Disclosure - DWS Equity 500 Index Fund Annual Fund Operating Expenses link:presentationLink link:definitionLink link:calculationLink 220030 - Disclosure - DWS Equity 500 Index Fund Expense Example link:presentationLink link:definitionLink link:calculationLink 220040 - Disclosure - DWS Equity 500 Index Fund Expense Example, No Redemption link:presentationLink link:definitionLink link:calculationLink 220045 - Disclosure - DWS Equity 500 Index Fund Risks Data link:presentationLink link:definitionLink link:calculationLink 220050 - Disclosure - DWS Equity 500 Index Fund Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 220060 - Disclosure - DWS Equity 500 Index Fund Average Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 220070 - Disclosure - DWS Equity 500 Index Fund Market Index Performance link:presentationLink link:definitionLink link:calculationLink 210000 - Disclosure - DWS Equity 500 Index Fund N-1A Cover link:presentationLink link:definitionLink link:calculationLink DWS S&P 500 Index Fund S000032010 [Member] Class A C000099641 [Member] Class C C000099643 [Member] Class R6 C000188496 [Member] Class S C000099644 [Member] Return Before Taxes[Member] S&P 500® Index (reflects no deduction for fees, expenses or taxes)[Member] Risk Stock Market [Member] Risk Market Disruption [Member] Risk Passive Investing [Member] Risk Index Related [Member] Risk Tracking Error [Member] Risk Large Sized Companies [Member] Risk Derivatives [Member] Risk Securities Lending [Member] Risk Counterparty [Member] Risk Liquidity [Member] Risk Pricing [Member] Risk Operational And Technology [Member] DWS Equity 500 Index Fund S000005959 [Member] C000188490 [Member] INST Class C000016414 [Member] C000016413 [Member]