Condensed Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Net income	$ 275	$ 238	$ 470	$ 481
Change in net unrealized gain on securities available for sale:
Net unrealized gain	119	16	208	37
Reclassification of impairment charges included in earnings	7	2	25	9
Other reclassifications included in earnings	(1)	1	(1)	1
Income tax effect	(47)	(8)	(86)	(18)
Total other comprehensive income	78	11	146	29
Comprehensive Income	$ 353	$ 249	$ 616	$ 510