Condensed Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Condensed Consolidated Statements of Comprehensive Income [Abstract]
Net Income	$ 324	$ 256	$ 650	$ 462
Change in net unrealized gain on securities available for sale:
Net unrealized gain (loss)	126	(477)	285	(480)
Reclassification of impairment charges included in net impairment losses on securities		3		7
Other reclassifications included in other revenue	(1)	(3)	(2)	(3)
Other				1
Other comprehensive income (loss), before tax	125	(477)	283	(475)
Income tax effect	(47)	180	(106)	180
Other comprehensive income (loss), net of tax	78	(297)	177	(295)
Comprehensive Income (Loss)	$ 402	$ (41)	$ 827	$ 167