Consolidated Statement of Comprehensive Income (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Statement of Other Comprehensive Income [Abstract]
Net income	$ 579	$ 490	$ 1,043	$ 917
Other comprehensive income (loss), net of related taxes:
Processing fees and other revenue	(55)	(299)	(303)	(153)
Change in net unrealized losses on available-for-sale securities, net of reclassification adjustment and net of related taxes	(804)	75	(753)	251
Change in net unrealized losses on available-for-sale securities designated in fair value hedges, net of related taxes	45	(17)	60	15
Other-than-temporary impairment on held-to-maturity securities related to factors other than credit, net of related taxes	5	0	11	3
Change in net unrealized losses on cash flow hedges, net of related taxes	30	3	94	4
Change in unrealized losses on retirement plans, net of related taxes	5	0	8	2
Other comprehensive income (loss)	(774)	(238)	(883)	122
Total comprehensive income (loss)	$ (195)	$ 252	$ 160	$ 1,039