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Reserves for Losses (Details 1) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Card Member Receivables And Related Reserves Evaluated Separately and Collectively For Impairment [Abstract]    
Card Member receivables evaluated individually for impairment $ 49 $ 50
Reserves on Card Member receivables evaluated individually for impairment 36 38
Card Member receivables evaluated collectively for impairment 44,605 44,113
Reserves on Card Member receivables evaluated collectively for impairment $ 378 $ 348