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
Comprehensive Income, Net of Tax
Net income	$ 538	$ 327	$ 983	$ 561
Other Comprehensive Income, Net of Tax:
Unrealized net holding gains (losses) arising during the period on securities available for sale	66	174	185	257
Reclassification adjustment for (gains) losses on securities available for sale included in net income	1	1	7	1
Change in amounts attributable to the FDIC under the loss share agreements	14	4	(28)	(53)
Change in unrecognized gains (losses) on cash flow hedges	(16)	(51)	(15)	(42)
Change in pension and postretirement liability	11	4	22	9
Other, net	(1)	0	1	1
Total other comprehensive income	75	132	172	173
Total comprehensive income	613	459	1,155	734
Unrealized net holding gains (losses) arising during the period on securities available for sale	38	103	112	152
Reclassification adjustment for (gains) losses on securities available for sale included in net income	1	1	4	1
Change in amounts attributable to the FDIC under the loss share agreements	8	3	(18)	(31)
Change in unrecognized gains (losses) on cash flow hedges	(10)	(31)	(10)	(25)
Change in pension and postretirement liability	7	3	14	6
Other, net	$ 1	$ 0	$ 1	$ (1)