Reserves for Losses (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Changes in the Card Member receivables reserve for losses
Balance, January 1			$ 428	$ 438
Additions:
Card Member receivables provisions			472	434
Card Member receivables provisions - other			118	97
Total provision	194	190	590	531
Deductions:
Card Member receivables net write-offs			(507)	(487)
Card Member receivables reserves for losses - other			(115)	(73)
Balance, September 30	$ 396	$ 409	$ 396	$ 409