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Reserves for Losses (Details 1) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Cardmember Receivables And Related Reserves Evaluated Separately and Collectively For Impairment [Abstract]    
Cardmember receivables evaluated separately for impairment $ 113 $ 117
Reserves on cardmember receivables evaluated separately for impairment 88 91
Cardmember receivables evaluated collectively for impairment 43,258 42,649
Reserves on cardmember receivables evaluated collectively for impairment $ 322 $ 337