Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Accumulated Other Comprehensive Income (Loss)
Net income, net of tax	$ 445	$ 234
Unrealized net holding gains (losses) arising during the period on securities available for sale, After-Tax	119	83
Reclassification adjustment for (gains) losses on securities available for sale included in net income, After-Tax	6	0
Net change in amounts attributable to the FDIC under the loss share agreements, After-Tax	(42)	(57)
Net change in unrecognized gains (losses) on cash flow hedges, After-Tax	1	9
Net change in pension and postretirement liability, After-Tax	11	5
Net change in other net, After-Tax	2	1
Total other comprehensive income	97	41
Total comprehensive income (loss), After-Tax	$ 542	$ 275