Condensed Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net income	$ 247	$ 220	$ 717	$ 701
Change in net unrealized gain on securities available for sale:
Net unrealized gain	250	4	458	41
Reclassification of impairment charges included in earnings	3	13	28	22
Other reclassifications included in earnings			(1)	1
Income tax effect	(95)	(6)	(181)	(24)
Total other comprehensive income	158	11	304	40
Comprehensive Income	$ 405	$ 231	$ 1,021	$ 741