Acquisition, Divestiture and Discontinued Operations (Details 6) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Combined results of the discontinued operations
Net interest income	$ 2,267	$ 2,511	$ 2,380
Net interest income (expense) after provision for loan and lease losses	2,327	1,873	(779)
Noninterest income	1,808	1,954	2,035
Intangible assets impairment			241
Noninterest expense	2,790	3,034	3,554
Income (loss) before income taxes	(70)	(37)	(76)
Income taxes	369	186	(1,035)
Income (loss) from discontinued operations, net of taxes	(44)	(23)	(48)
Segment, Discontinued Operations [Member]
Combined results of the discontinued operations
Net interest income	138	157	95
Provision for loan and lease losses	113	79	126
Net interest income (expense) after provision for loan and lease losses	25	78	(31)
Noninterest income	(54)	(61)	49
Intangible assets impairment	0		27
Noninterest expense	41	54	67
Income taxes	$ (26)	$ (14)	$ (28)