Amendment Flag Amendment Flag Annual Fund Operating Expenses Table [Text Block] Annual Fund Operating Expenses [Table] Annual Return 2010 Annual Return 2010 Annual Return 2011 Annual Return 2011 Average Annual Return [Abstract] Average Annual Return: Average Annual Return Caption Caption Average Annual Return Inception Date Inception Date Average Annual Return Label Label Average Annual Return Since Inception Since Inception Average Annual Return Year 01 1 Year Bar Chart And Performance Table Heading Bar Chart and Performance Table [Heading] Bar Chart Closing [Text Block] Bar Chart Closing [Text Block] Bar Chart Heading Bar Chart [Heading] Bar Chart Highest Quarterly Return Highest Quarterly Return Bar Chart Lowest Quarterly Return Lowest Quarterly Return Bar Chart Narrative [Text Block] Bar Chart Narrative [Text Block] Bar Chart Table [Abstract] Bar Chart Table: Bar Chart Table [Text Block] Bar Chart [Table] Bar Chart Year To Date Return Bar Chart, Year to Date Return Bar Chart Year To Date Return Date Bar Chart, Year to Date Return, Date Class A C 000075886 [Member] Class A Class 529-F-1 C 000075887 [Member] Class 529-F-1 Class R-1 C 000075888 [Member] Class R-1 Class R-2 C 000075889 [Member] Class R-2 Class R-3 C 000075890 [Member] Class R-3 Class R-4 C 000075891 [Member] Class R-4 Class R-5 C 000075892 [Member] Class R-5 Class R-6 C 000075893 [Member] Class R-6 Class B C 000075894 [Member] Class B Class C C 000075895 [Member] Class C Class F-1 C 000075896 [Member] Class F-1 Class F-2 C 000075897 [Member] Class F-2 Class 529-A C 000075898 [Member] Class 529-A Class 529-B C 000075899 [Member] Class 529-B Class 529-C C 000075900 [Member] Class 529-C Class 529-E C 000075901 [Member] Class 529-E Distribution And Service 12 b 1 Fees Over Assets Distribution and/or service (12b-1) fees Document Creation Date Document Creation Date Document [Domain] Prospectus Document Effective Date Document Effective Date Document Information Document [Axis] Document [Axis] Document Period End Date Document Period End Date Document Type Document Type Entity Central Index Key Central Index Key Entity [Domain] Series Entity Registrant Name Registrant Name Expense Example [Abstract] Expense Example: Expense Example By Year Caption Expense Example by, Year, Caption [Text] Expense Example Heading Expense Example [Heading] Expense Example Narrative [Text Block] Expense Example Narrative [Text Block] Expense Example No Redemption [Abstract] Expense Example, No Redemption: Expense Example No Redemption By Year Caption Expense Example, No Redemption, By Year, Caption [Text] Expense Example No Redemption Table [Text Block] Expense Example, No Redemption [Table] Expense Example No Redemption Year 01 Expense Example, No Redemption, 1 Year Expense Example No Redemption Year 03 Expense Example, No Redemption, 3 Years Expense Example No Redemption Year 05 Expense Example, No Redemption, 5 Years Expense Example No Redemption Year 10 Expense Example, No Redemption, 10 Years Expense Example With Redemption Table [Text Block] Expense Example, With Redemption [Table] Expense Example Year 01 Expense Example, with Redemption, 1 Year Expense Example Year 03 Expense Example, with Redemption, 3 Years Expense Example Year 05 Expense Example, with Redemption, 5 Years Expense Example Year 10 Expense Example, with Redemption, 10 Years Expense Heading Expense [Heading] Expense Narrative [Text Block] Expense Narrative [Text Block] Expenses Over Assets Total annual fund operating expenses Highest Quarterly Return Label Highest Quarterly Return, Label Legal Entity [Axis] Series [Axis] Lowest Quarterly Return Label Lowest Quarterly Return, Label Management Fees Over Assets Management fees Maximum Account Fee Maximum annual account fee (529 share classes only) Maximum Deferred Sales Charge Over Offering Price Maximum deferred sales charge (load) (as a percentage of the amount redeemed) Maximum Sales Charge Imposed On Purchases Over Offering Price Maximum sales charge (load) imposed on purchases (as a percentage of offering price) Maximum Sales Charge On Reinvested Dividends And Distributions Over Other Maximum sales charge (load) imposed on reinvested dividends Money Market Seven Day Yield Caption Money Market Seven Day Yield, Caption [Text] Money Market Seven Day Yield Phone Money Market Seven Day Yield Phone Objective Heading Objective [Heading] Objective Primary [Text Block] Objective, Primary [Text Block] Operating Expenses [Abstract] Operating Expenses: Operating Expenses Caption Operating Expenses Caption [Text] Other Expenses Over Assets Other expenses Performance Availability Web Site Address Performance Availability Website Address [Text] Performance Information Illustrates Variability Of Returns Performance Information Illustrates Variability of Returns [Text] Performance Narrative [Text Block] Performance Narrative [Text Block] Performance Past Does Not Indicate Future Performance Past Does Not Indicate Future [Text] Performance Table Closing [Text Block] Performance Table Closing [Text Block] Performance Table [Text Block] Performance [Table] Prospectus Date ProspectusDate Prospectus Share Class [Axis] Share Class [Axis] Prospectus [Table] Prospectus: Redemption Fee Over Redemption Redemption or exchange fees Risk Heading Risk [Heading] Risk Money Market Fund Risk Money Market Fund [Text] Risk Narrative [Text Block] Risk Narrative [Text Block] Risk Not Insured Depository Institution Risk Not Insured Depository Institution [Text] Risk Return [Abstract] Risk/Return: Risk Return Heading Risk/Return [Heading] American Funds Money Market Fund S 000025394 [Member] American Funds Money Market Fund Share Class [Domain] Share Classes Shareholder Fees [Abstract] Shareholder Fees: Shareholder Fees Caption Shareholder Fees Caption [Text] Shareholder Fees Table [Text Block] Shareholder Fees [Table] Strategy Heading Strategy [Heading] Strategy Narrative [Text Block] Strategy Narrative [Text Block] American Funds Money Market Fund (Prospectus Summary) Summary S 000025394 [Member] American Funds Money Market Fund (Prospectus Summary) Trading Symbol Trading Symbol Year To Date Return Label Year to Date Return, Label