Accumulated Other Comprehensive Income (Loss) (Components of Total Comprehensive Income) (Details) (USD $) In Millions	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Accumulated Other Comprehensive Income (Loss)
Net income, Pre-Tax	$ 418	$ 249	$ 705	$ 491
Provision for income taxes	91	25	144	73
Net income, net of tax	327	224	561	418
Unrealized net holding gains (losses) arising during the period on securities available for sale, Pre-Tax	277	551	409	855
Unrealized net holding gains (losses) arising during the period on securities available for sale, Tax Effect	103	209	152	325
Unrealized net holding gains (losses) arising during the period on securities available for sale, After-Tax	174	342	257	530
Reclassification adjustment for (gains) losses on securities available for sale included in net income, Pre-Tax	2	(219)	2	(216)
Reclassification adjustment for (gains) losses on securities available for sale included in net income, Tax Effect	1	(83)	1	(82)
Reclassification adjustment for (gains) losses on securities available for sale included in net income, After-Tax	1	(136)	1	(134)
Net change in amounts attributable to the FDIC under the loss share agreements, Pre-Tax	7	(82)	(84)	(126)
Net change in amounts attributable to the FDIC under the loss share agreements, Tax Effect	3	(31)	(31)	(48)
Net change in amounts attributable to the FDIC under the loss share agreements, After-Tax	4	(51)	(53)	(78)
Net change in unrecognized gains (losses) on cash flow hedges, Pre-Tax	(82)	(145)	(67)	(215)
Net change in unrecognized gains (losses) on cash flow hedges, Tax Effect	(31)	(55)	(25)	(82)
Net change in unrecognized gains (losses) on cash flow hedges, After-Tax	(51)	(90)	(42)	(133)
Net change in foreign currency translation adjustment, Pre-Tax		(1)		(1)
Net change in foreign currency translation adjustment, Tax Effect		1	(1)
Net change in foreign currency translation adjustment, After-Tax		(2)	1	(1)
Net change in pension and postretirement liability, Pre-Tax	7	(13)	15	(7)
Net change in pension and postretirement liability, Tax Effect	3	(5)	6	(3)
Net change in pension and postretirement liability, After-Tax	4	(8)	9	(4)
Total comprehensive income (loss), Pre-Tax	629	340	980	781
Total comprehensive income (loss), Tax Effect	170	61	246	183
Total comprehensive income (loss) (Note 10)	$ 459	$ 279	$ 734	$ 598

Total comprehensive income before tax.

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