Non-Interest Revenue and Expense Detail (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Details Of Certain Statements Of Income Lines Details [Abstract]
Foreign currency conversion fee revenue	$ 227	$ 222	$ 440	$ 432
Delinquency fees	174	167	355	331
Loyalty Partner-related fees	95	72	186	147
Service fees	90	94	180	176
Other commissions and fees	38	50	81	92
Total other commissions and fees	$ 624	$ 605	$ 1,242	$ 1,178