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Reserves for Losses (Details 1) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Cardmember Receivables And Related Reserves Evaluated Separately and Collectively For Impairment [Abstract]    
Cardmember receivables evaluated separately for impairment $ 121 $ 174
Reserves on cardmember receivables evaluated separately for impairment 98 118
Cardmember receivables evaluated collectively for impairment 41,419 40,716
Reserves on cardmember receivables evaluated collectively for impairment $ 294 $ 320