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Reserves for Losses (Details 2) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Changes in the Card Member loans reserve for losses      
Balance, January 1 $ 1,471 $ 1,874 $ 3,646
Additions:      
Card Member loans provisions 1,114 1,031 145
Card Member loans provisions - other 115 118 108
Total provision 1,229 1,149 253
Deductions:      
Card Member loans net write-offs - principal (1,141) (1,280) (1,720)
Card Member loans net write-offs - interest and fees (150) (157) (201)
Card Member loans - other (148) (115) (104)
Balance, December 31 $ 1,261 $ 1,471 $ 1,874