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Reserves for Losses (Details 1) (USD $)
In Millions
Jun. 30, 2011
Dec. 31, 2010
Cardmember Receivables And Related Reserves Evaluated Separately and Collectively For Impairment [Abstract]    
Cardmember receivables evaluated separately for impairment $ 138 $ 114
Reserves on cardmember receivables evaluated separately for impairment 83 63
Cardmember receivables evaluated collectively for impairment 40,005 37,152
Reserves on cardmember receivables evaluated collectively for impairment $ 332 $ 323