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Reserves for Losses (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Changes in the Card Member loans reserve for losses      
Balance, January 1 $ 1,028 $ 1,201 $ 1,261
Card Member loans provisions 1,235 1,190 1,138
Card Member loans net write-offs - principal (930) (967) (1,023)
Card Member loans net write-offs - interest and fees (175) (162) (164)
Reserves transferred to Held for Sale portfolio 0 (224) 0
Card Member loans reserves for losses - other 65 (10) (11)
Balance, December 31 $ 1,223 $ 1,028 $ 1,201