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Reserves for Losses (Details 3) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Card Member Receivables And Related Reserves Evaluated Separately and Collectively For Impairment [Abstract]      
Card Member receivables evaluated separately for impairment $ 55 $ 33 $ 48
Reserves on Card Member receivables evaluated separately for impairment 28 20 35
Card Member receivables evaluated collectively for impairment 47,253 44,100 44,803
Reserves on Card Member receivables evaluated collectively for impairment $ 439 $ 442 $ 430