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Reserves for Losses (Details 2) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Changes in the Card Member loans reserve for losses    
Balance, January 1 $ 1,261 $ 1,471
Card Member loans - provisions 250 243
Card Member loans net write-offs - principal (280) (304)
Card Member loans net write-offs - interest and fees (42) (38)
Card Member loans - other 2 (5)
Balance, March 31 $ 1,191 $ 1,367