Condensed Consolidated Statements of Comprehensive (Loss) Income (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Condensed Consolidated Statements of Comprehensive (Loss) Income [Abstract]
Net Income	$ 256	$ 275	$ 462	$ 470
Change in net unrealized gain on securities available for sale:
Net unrealized (loss) gain	(477)	119	(480)	208
Reclassification of impairment charges included in net impairment losses on securities	3	7	7	25
Other reclassifications included in other revenue	(3)	(1)	(3)	(1)
Other			1
Other comprehensive (loss) income, before tax	(477)	125	(475)	232
Income tax effect	180	(47)	180	(86)
Other comprehensive (loss) income, net of tax	(297)	78	(295)	146
Comprehensive (Loss) Income	$ (41)	$ 353	$ 167	$ 616