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Reserves for Losses (Details 2) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Changes in the cardmember loans reserve for losses        
Balance, January 1     $ 1,874 $ 3,646
Balance, December 31 1,547 2,560 1,547 2,560
Additions:        
Cardmember loans provisions     438 7
Cardmember loans provisions - other     51 49
Total provision 277 176 489 56
Deductions:        
Cardmember loans net write-offs - principal     (678) (992)
Cardmember loans net write-offs - interest and fees     (85) (115)
Cardmember loans - other     (53) (35)
Cardmember loans, reserves $ 1,547 $ 2,560 $ 1,547 $ 2,560