Condensed Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Condensed Consolidated Statements of Comprehensive Income [Abstract]
Net Income	$ 321	$ 290	$ 971	$ 752
Change in net unrealized gain on securities available for sale:
Net unrealized (loss) gain	(25)	72	260	(408)
Reclassification of impairment charges included in net impairment losses on securities	1	1	1	8
Other reclassifications included in other revenue	(12)	(2)	(14)	(5)
Other				1
Other comprehensive (loss) income, before tax	(36)	71	247	(404)
Income tax effect	13	(28)	(93)	152
Other comprehensive (loss) income, net of tax	(23)	43	154	(252)
Comprehensive Income	$ 298	$ 333	$ 1,125	$ 500