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Reserves for Losses (Details 1) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Cardmember Receivables And Related Reserves Evaluated Separately and Collectively For Impairment [Abstract]      
Cardmember receivables evaluated separately for impairment $ 117 $ 174 $ 114
Reserves on cardmember receivables evaluated separately for impairment 91 118 63
Cardmember receivables evaluated collectively for impairment 42,649 40,716 37,152
Reserves on cardmember receivables evaluated collectively for impairment $ 337 $ 320 $ 323