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Reserves For Losses (Details 3) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Card Member Loans And Related Reserves Evaluated Separately And Collectively For Impairment [Abstract]    
Card Member loans evaluated individually for impairment $ 333 $ 286
Reserves on Card Member loans evaluated individually for impairment 66 67
Card Member loans evaluated collectively for impairment 68,562 70,099
Reserves on Card Member loans evaluated collectively for impairment $ 1,098 $ 1,134