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Reserves for Losses (Details 1) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Card Member Receivables And Related Reserves Evaluated Separately and Collectively For Impairment [Abstract]    
Card Member receivables evaluated individually for impairment $ 38 $ 33
Reserves on Card Member receivables evaluated individually for impairment 20 20
Card Member receivables evaluated collectively for impairment 44,435 44,100
Reserves on Card Member receivables evaluated collectively for impairment $ 426 $ 442