Reserves for Losses (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Changes in the cardmember receivables reserve for losses
Balance, January 1			$ 428	$ 438
Additions:
Cardmember receivables provisions			314	283
Cardmember receivables provisions - other			82	58
Total provision	201	163	396	341
Deductions:
Cardmember receivables net write-offs	(358)	(346)	(358)	(346)
Cardmember receivables reserves for losses - other	(80)	(41)	(80)	(41)
Balance, June 30	$ 386	$ 392	$ 386	$ 392