Condensed Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Condensed Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 326	$ 206
Change in net unrealized gain on securities available for sale:
Net unrealized gain (loss)	159	(3)
Reclassification of impairment charges included in net impairment losses on securities		4
Other reclassifications included in other revenue	(1)
Other		1
Other comprehensive income, before tax	158	2
Income tax effect	(59)
Other comprehensive income, net of tax	99	2
Comprehensive Income	$ 425	$ 208