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Reserves for Losses (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Changes in the cardmember receivables reserve for losses    
Balance, January 1 $ 428 $ 438
Additions:    
Cardmember receivables provisions 154 149
Cardmember receivables provisions - other 41 29
Total provision 195 178
Deductions:    
Cardmember receivables net write-offs (178) (182)
Cardmember receivables reserves for losses - other (35) (10)
Balance, March 31 $ 410 $ 424