XML 60 R48.htm IDEA: XBRL DOCUMENT v3.8.0.1
Reserves for Losses (Details 2) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Changes in the Card Member receivables reserve for losses        
Balance, January 1     $ 467 $ 462
Card Member receivables - provisions $ 214 $ 174 590 496
Card Member receivables - net write-offs     (548) (518)
Card Member receivables reserves for losses - other     3 (3)
Balance, September 30 $ 512 $ 437 $ 512 $ 437