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Reserves for Losses (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Changes in the Card Member receivables reserve for losses      
Balance, January 1 $ 428 $ 438 $ 386
Additions:      
Card Member receivables provisions 647 601 603
Card Member receivables provisions - other 142 141 167
Total provision 789 742 770
Deductions:      
Card Member receivables net write-offs (669) (640) (560)
Card Member receivables reserves for losses - other (162) (112) (158)
Balance, December 31 $ 386 $ 428 $ 438