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Reserves For Losses (Details 1) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Card Member Loans And Related Reserves Evaluated Separately And Collectively For Impairment [Abstract]      
Card Member loans evaluated separately for impairment $ 346 $ 279 $ 286
Reserves on Card Member loans evaluated separately for impairment 60 53 67
Card Member loans evaluated collectively for impairment 64,919 58,294 70,099
Reserves on Card Member loans evaluated collectively for impairment $ 1,163 $ 975 $ 1,134