3.3.1.900 html 34 70 1 false 24 0 false 2 false false R1.htm 000001 - Document - Document and Entity Information Sheet http://dreyfus.com/20160329/role/DocumentAndEntityInformation Document and Entity Information 1 false true R2.htm 020000 - Document - Risk/Return Summary {Unlabeled} - Class A Prospectus - General Money Market Fund Inc (Class A) Sheet http://dreyfus.com/20160329/role/DocumentRiskReturnSummaryUnlabeledClassAProspectusGeneralMoneyMarketFundIncClassA Risk/Return Summary- Class A Prospectus - General Money Market Fund Inc (Class A) 2 false false R7.htm 020005 - Disclosure - Risk/Return Detail Data {Elements} - Class A Prospectus - General Money Market Fund Inc (Class A) Sheet http://dreyfus.com/20160329/role/DisclosureRiskReturnDetailDataElementsClassAProspectusGeneralMoneyMarketFundIncClassA Risk/Return Detail Data- Class A Prospectus - General Money Market Fund Inc (Class A) 3 false true R8.htm 020006 - Document - Risk/Return Summary {Unlabeled} - Class A Prospectus - General Government Securities Money Market Fund (Class A) Sheet http://dreyfus.com/20160329/role/DocumentRiskReturnSummaryUnlabeledClassAProspectusGeneralGovernmentSecuritiesMoneyMarketFundClassA Risk/Return Summary- Class A Prospectus - General Government Securities Money Market Fund (Class A) 4 false false R13.htm 020011 - Disclosure - Risk/Return Detail Data {Elements} - Class A Prospectus - General Government Securities Money Market Fund (Class A) Sheet http://dreyfus.com/20160329/role/DisclosureRiskReturnDetailDataElementsClassAProspectusGeneralGovernmentSecuritiesMoneyMarketFundClassA Risk/Return Detail Data- Class A Prospectus - General Government Securities Money Market Fund (Class A) 5 false true R14.htm 020012 - Document - Risk/Return Summary {Unlabeled} - Class A Prospectus - General Treasury Prime Money Market Fund (Class A) Sheet http://dreyfus.com/20160329/role/DocumentRiskReturnSummaryUnlabeledClassAProspectusGeneralTreasuryPrimeMoneyMarketFundClassA Risk/Return Summary- Class A Prospectus - General Treasury Prime Money Market Fund (Class A) 6 false false R19.htm 020017 - Disclosure - Risk/Return Detail Data {Elements} - Class A Prospectus - General Treasury Prime Money Market Fund (Class A) Sheet http://dreyfus.com/20160329/role/DisclosureRiskReturnDetailDataElementsClassAProspectusGeneralTreasuryPrimeMoneyMarketFundClassA Risk/Return Detail Data- Class A Prospectus - General Treasury Prime Money Market Fund (Class A) 7 false true R20.htm 020018 - Document - Risk/Return Summary {Unlabeled} - Class A Prospectus - General Municipal Money Market Funds, Inc. (General Municipal Money Market Fund - Class A) Sheet http://dreyfus.com/20160329/role/DocumentRiskReturnSummaryUnlabeledClassAProspectusGeneralMunicipalMoneyMarketFundsIncGeneralMunicipalMoneyMarketFundClassA Risk/Return Summary- Class A Prospectus - General Municipal Money Market Funds, Inc. (General Municipal Money Market Fund - Class A) 8 false false R25.htm 020023 - Disclosure - Risk/Return Detail Data {Elements} - Class A Prospectus - General Municipal Money Market Funds, Inc. (General Municipal Money Market Fund - Class A) Sheet http://dreyfus.com/20160329/role/DisclosureRiskReturnDetailDataElementsClassAProspectusGeneralMunicipalMoneyMarketFundsIncGeneralMunicipalMoneyMarketFundClassA Risk/Return Detail Data- Class A Prospectus - General Municipal Money Market Funds, Inc. (General Municipal Money Market Fund - Class A) 9 false true R26.htm 020024 - Document - Risk/Return Summary {Unlabeled} - Class A Prospectus - General California Municipal Money Market Fund (Class A) Sheet http://dreyfus.com/20160329/role/DocumentRiskReturnSummaryUnlabeledClassAProspectusGeneralCaliforniaMunicipalMoneyMarketFundClassA Risk/Return Summary- Class A Prospectus - General California Municipal Money Market Fund (Class A) 10 false false R31.htm 020029 - Disclosure - Risk/Return Detail Data {Elements} - Class A Prospectus - General California Municipal Money Market Fund (Class A) Sheet http://dreyfus.com/20160329/role/DisclosureRiskReturnDetailDataElementsClassAProspectusGeneralCaliforniaMunicipalMoneyMarketFundClassA Risk/Return Detail Data- Class A Prospectus - General California Municipal Money Market Fund (Class A) 11 false true R32.htm 020030 - Document - Risk/Return Summary {Unlabeled} - Class A Prospectus - General New York AMT-Free Municipal Money Market Fund (Class A) Sheet http://dreyfus.com/20160329/role/DocumentRiskReturnSummaryUnlabeledClassAProspectusGeneralNewYorkAMTFreeMunicipalMoneyMarketFundClassA Risk/Return Summary- Class A Prospectus - General New York AMT-Free Municipal Money Market Fund (Class A) 12 false false R37.htm 020035 - Disclosure - Risk/Return Detail Data {Elements} - Class A Prospectus - General New York AMT-Free Municipal Money Market Fund (Class A) Sheet http://dreyfus.com/20160329/role/DisclosureRiskReturnDetailDataElementsClassAProspectusGeneralNewYorkAMTFreeMunicipalMoneyMarketFundClassA Risk/Return Detail Data- Class A Prospectus - General New York AMT-Free Municipal Money Market Fund (Class A) 13 false true R38.htm 020036 - Document - Risk/Return Summary {Unlabeled} - Class B Prospectus - General Money Market Fund Inc (Class B) Sheet http://dreyfus.com/20160329/role/DocumentRiskReturnSummaryUnlabeledClassBProspectusGeneralMoneyMarketFundIncClassB Risk/Return Summary- Class B Prospectus - General Money Market Fund Inc (Class B) 14 false false R43.htm 020041 - Disclosure - Risk/Return Detail Data {Elements} - Class B Prospectus - General Money Market Fund Inc (Class B) Sheet http://dreyfus.com/20160329/role/DisclosureRiskReturnDetailDataElementsClassBProspectusGeneralMoneyMarketFundIncClassB Risk/Return Detail Data- Class B Prospectus - General Money Market Fund Inc (Class B) 15 false true R44.htm 020042 - Document - Risk/Return Summary {Unlabeled} - Class B Prospectus - General Government Securities Money Market Fund (Class B) Sheet http://dreyfus.com/20160329/role/DocumentRiskReturnSummaryUnlabeledClassBProspectusGeneralGovernmentSecuritiesMoneyMarketFundClassB Risk/Return Summary- Class B Prospectus - General Government Securities Money Market Fund (Class B) 16 false false R49.htm 020047 - Disclosure - Risk/Return Detail Data {Elements} - Class B Prospectus - General Government Securities Money Market Fund (Class B) Sheet http://dreyfus.com/20160329/role/DisclosureRiskReturnDetailDataElementsClassBProspectusGeneralGovernmentSecuritiesMoneyMarketFundClassB Risk/Return Detail Data- Class B Prospectus - General Government Securities Money Market Fund (Class B) 17 false true R50.htm 020048 - Document - Risk/Return Summary {Unlabeled} - Class B Prospectus - General Treasury Prime Money Market Fund (Class B) Sheet http://dreyfus.com/20160329/role/DocumentRiskReturnSummaryUnlabeledClassBProspectusGeneralTreasuryPrimeMoneyMarketFundClassB Risk/Return Summary- Class B Prospectus - General Treasury Prime Money Market Fund (Class B) 18 false false R55.htm 020053 - Disclosure - Risk/Return Detail Data {Elements} - Class B Prospectus - General Treasury Prime Money Market Fund (Class B) Sheet http://dreyfus.com/20160329/role/DisclosureRiskReturnDetailDataElementsClassBProspectusGeneralTreasuryPrimeMoneyMarketFundClassB Risk/Return Detail Data- Class B Prospectus - General Treasury Prime Money Market Fund (Class B) 19 false true R56.htm 020054 - Document - Risk/Return Summary {Unlabeled} - Class B Prospectus - General Municipal Money Market Funds, Inc. (General Municipal Money Market Fund - Class B) Sheet http://dreyfus.com/20160329/role/DocumentRiskReturnSummaryUnlabeledClassBProspectusGeneralMunicipalMoneyMarketFundsIncGeneralMunicipalMoneyMarketFundClassB Risk/Return Summary- Class B Prospectus - General Municipal Money Market Funds, Inc. (General Municipal Money Market Fund - Class B) 20 false false R61.htm 020059 - Disclosure - Risk/Return Detail Data {Elements} - Class B Prospectus - General Municipal Money Market Funds, Inc. (General Municipal Money Market Fund - Class B) Sheet http://dreyfus.com/20160329/role/DisclosureRiskReturnDetailDataElementsClassBProspectusGeneralMunicipalMoneyMarketFundsIncGeneralMunicipalMoneyMarketFundClassB Risk/Return Detail Data- Class B Prospectus - General Municipal Money Market Funds, Inc. (General Municipal Money Market Fund - Class B) 21 false true R62.htm 020060 - Document - Risk/Return Summary {Unlabeled} - Class B Prospectus - General California Municipal Money Market Fund (Class B) Sheet http://dreyfus.com/20160329/role/DocumentRiskReturnSummaryUnlabeledClassBProspectusGeneralCaliforniaMunicipalMoneyMarketFundClassB Risk/Return Summary- Class B Prospectus - General California Municipal Money Market Fund (Class B) 22 false false R67.htm 020065 - Disclosure - Risk/Return Detail Data {Elements} - Class B Prospectus - General California Municipal Money Market Fund (Class B) Sheet http://dreyfus.com/20160329/role/DisclosureRiskReturnDetailDataElementsClassBProspectusGeneralCaliforniaMunicipalMoneyMarketFundClassB Risk/Return Detail Data- Class B Prospectus - General California Municipal Money Market Fund (Class B) 23 false true R68.htm 020066 - Document - Risk/Return Summary {Unlabeled} - Class B Prospectus - General New York AMT-Free Municipal Money Market Fund (Class B) Sheet http://dreyfus.com/20160329/role/DocumentRiskReturnSummaryUnlabeledClassBProspectusGeneralNewYorkAMTFreeMunicipalMoneyMarketFundClassB Risk/Return Summary- Class B Prospectus - General New York AMT-Free Municipal Money Market Fund (Class B) 24 false false R73.htm 020071 - Disclosure - Risk/Return Detail Data {Elements} - Class B Prospectus - General New York AMT-Free Municipal Money Market Fund (Class B) Sheet http://dreyfus.com/20160329/role/DisclosureRiskReturnDetailDataElementsClassBProspectusGeneralNewYorkAMTFreeMunicipalMoneyMarketFundClassB Risk/Return Detail Data- Class B Prospectus - General New York AMT-Free Municipal Money Market Fund (Class B) 25 false true R74.htm 020072 - Document - Risk/Return Summary {Unlabeled} - Dreyfus Class Prospectus - General Money Market Fund Inc (Dreyfus Class, Class A) Sheet http://dreyfus.com/20160329/role/DocumentRiskReturnSummaryUnlabeledDreyfusClassProspectusGeneralMoneyMarketFundIncDreyfusClassClassA Risk/Return Summary- Dreyfus Class Prospectus - General Money Market Fund Inc (Dreyfus Class, Class A) 26 false false R79.htm 020077 - Disclosure - Risk/Return Detail Data {Elements} - Dreyfus Class Prospectus - General Money Market Fund Inc (Dreyfus Class, Class A) Sheet http://dreyfus.com/20160329/role/DisclosureRiskReturnDetailDataElementsDreyfusClassProspectusGeneralMoneyMarketFundIncDreyfusClassClassA Risk/Return Detail Data- Dreyfus Class Prospectus - General Money Market Fund Inc (Dreyfus Class, Class A) 27 false true R80.htm 020078 - Document - Risk/Return Summary {Unlabeled} - Dreyfus Class Prospectus - General Government Securities Money Market Fund (Dreyfus Class, Class A) Sheet http://dreyfus.com/20160329/role/DocumentRiskReturnSummaryUnlabeledDreyfusClassProspectusGeneralGovernmentSecuritiesMoneyMarketFundDreyfusClassClassA Risk/Return Summary- Dreyfus Class Prospectus - General Government Securities Money Market Fund (Dreyfus Class, Class A) 28 false false R85.htm 020083 - Disclosure - Risk/Return Detail Data {Elements} - Dreyfus Class Prospectus - General Government Securities Money Market Fund (Dreyfus Class, Class A) Sheet http://dreyfus.com/20160329/role/DisclosureRiskReturnDetailDataElementsDreyfusClassProspectusGeneralGovernmentSecuritiesMoneyMarketFundDreyfusClassClassA Risk/Return Detail Data- Dreyfus Class Prospectus - General Government Securities Money Market Fund (Dreyfus Class, Class A) 29 false true R86.htm 020084 - Document - Risk/Return Summary {Unlabeled} - Dreyfus Class Prospectus - General Treasury Prime Money Market Fund (Dreyfus Class, Class A) Sheet http://dreyfus.com/20160329/role/DocumentRiskReturnSummaryUnlabeledDreyfusClassProspectusGeneralTreasuryPrimeMoneyMarketFundDreyfusClassClassA Risk/Return Summary- Dreyfus Class Prospectus - General Treasury Prime Money Market Fund (Dreyfus Class, Class A) 30 false false R91.htm 020089 - Disclosure - Risk/Return Detail Data {Elements} - Dreyfus Class Prospectus - General Treasury Prime Money Market Fund (Dreyfus Class, Class A) Sheet http://dreyfus.com/20160329/role/DisclosureRiskReturnDetailDataElementsDreyfusClassProspectusGeneralTreasuryPrimeMoneyMarketFundDreyfusClassClassA Risk/Return Detail Data- Dreyfus Class Prospectus - General Treasury Prime Money Market Fund (Dreyfus Class, Class A) 31 false false R92.htm 040000 - Disclosure - Risk/Return Detail Data {Elements} Sheet http://xbrl.sec.gov/rr/role/RiskReturnDetailData Risk/Return Detail Data 32 false false All Reports Book All Reports ck0000353560-20160329.xml ck0000353560-20160329.xsd ck0000353560-20160329_cal.xml ck0000353560-20160329_def.xml ck0000353560-20160329_lab.xml ck0000353560-20160329_pre.xml BarChart1.png BarChart2.png BarChart3.png BarChart4.png BarChart5.png BarChart6.png BarChart7.png BarChart8.png BarChart9.png BarChart10.png BarChart11.png BarChart12.png BarChart13.png BarChart14.png BarChart15.png true true