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Label Element Value
Risk Return Abstract rr_RiskReturnAbstract  
Document Type dei_DocumentType 497
Document Period End Date dei_DocumentPeriodEndDate Dec. 31, 2017
Registrant Name dei_EntityRegistrantName PUTNAM MONEY MARKET FUND
Central Index Key dei_EntityCentralIndexKey 0000081248
Amendment Flag dei_AmendmentFlag false
Trading Symbol dei_TradingSymbol PDDXX
Document Creation Date dei_DocumentCreationDate Oct. 30, 2018
Document Effective Date dei_DocumentEffectiveDate Dec. 05, 2018
Prospectus Date rr_ProspectusDate Jan. 30, 2018
Putnam Money Market  
Risk Return Abstract rr_RiskReturnAbstract  
Supplement Text PDDXX_SupplementText
Prospectus Supplement   November 1, 2018 
 
Putnam Government Money Market Fund   
Putnam Money Market Fund   
Prospectuses dated January 30, 2018   

 

Class T1 shares will be terminated effective December 5, 2018. Class T1 shares of each fund acquired prior to December 5, 2018 will convert automatically to class A shares effective December 5, 2018.

 

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