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Reserves For Losses (Details 3) (USD $)
In Millions
Jun. 30, 2011
Dec. 31, 2010
Cardmember Loans And Related Reserves Evaluated Separately And Collectively For Impairment [Abstract]    
Cardmember loans evaluated separately for impairment $ 907 $ 1,087
Reserves on cardmember loans evaluated separately for impairment 219 279
Cardmember loans evaluated collectively for impairment 57,842 59,763
Reserves on cardmember loans evaluated collectively for impairment $ 2,341 $ 3,367