Net Assets C000075886 [Member] American Funds® U.S. Government Money Market Fund - Class A C000075895 [Member] American Funds® U.S. Government Money Market Fund - Class C C000189453 [Member] American Funds® U.S. Government Money Market Fund - Class T C000075896 [Member] American Funds® U.S. Government Money Market Fund - Class F-1 C000075897 [Member] American Funds® U.S. Government Money Market Fund - Class F-2 C000179955 [Member] American Funds® U.S. Government Money Market Fund - Class F-3 C000075898 [Member] American Funds® U.S. Government Money Market Fund - Class 529-A C000075900 [Member] American Funds® U.S. Government Money Market Fund - Class 529-C C000075901 [Member] American Funds® U.S. Government Money Market Fund - Class 529-E C000189452 [Member] American Funds® U.S. Government Money Market Fund - Class 529-T C000075887 [Member] American Funds® U.S. Government Money Market Fund - Class 529-F-1 C000224559 [Member] American Funds® U.S. Government Money Market Fund - Class 529-F-2 C000224560 [Member] American Funds® U.S. Government Money Market Fund - Class 529-F-3 C000202065 [Member] American Funds® U.S. Government Money Market Fund - Class ABLE-A C000224794 [Member] American Funds® U.S. Government Money Market Fund - Class ABLE-F-2 C000075888 [Member] American Funds® U.S. Government Money Market Fund - Class R-1 C000075889 [Member] American Funds® U.S. Government Money Market Fund - Class R-2 C000148462 [Member] American Funds® U.S. Government Money Market Fund - Class R-2E C000075890 [Member] American Funds® U.S. Government Money Market Fund - Class R-3 C000075891 [Member] American Funds® U.S. Government Money Market Fund - Class R-4 C000164807 [Member] American Funds® U.S. Government Money Market Fund - Class R-5E C000075892 [Member] American Funds® U.S. Government Money Market Fund - Class R-5 C000075893 [Member] American Funds® U.S. Government Money Market Fund - Class R-6 Investment Type [Axis] US Treasury Bills [Member] Federal Agency Bills And Notes [Member] Repurchase Agreements [Member] US Treasury Bonds And Notes [Member] Other Assets Less Liabilities [Member]