Accumulated Other Comprehensive Income (Loss) (Balances in Accumulated Other Comprehensive Income (Loss)) (Details) (USD $) In Millions	Jun. 30, 2011		Dec. 31, 2010
Unrealized net gains (losses) on cash flow hedges	$ (142)		$ (75)
Total	(574)		(747)
Unrealized pretax gain on securities covered by FDIC loss share agreements	395		305
Pre-Tax [Member]
Unrecognized net pension and postretirement costs	(572)		(587)
Unrealized net gains (losses) on cash flow hedges	(142)		(75)
Unrealized net gains (losses) on securities available for sale	195		(250)
Unrecognized loss on securities held to maturity	(34)	[1]
FDIC's share of unrealized (gains) losses on securities available for sale under the loss share agreements	(365)	[2]	(281)	[2]
Foreign currency translation adjustment	(6)		(6)
Total	(924)		(1,199)
Deferred Tax Expenses [Member]
Unrecognized net pension and postretirement costs	(213)		(219)
Unrealized net gains (losses) on cash flow hedges	(53)		(28)
Unrealized net gains (losses) on securities available for sale	73		(93)
Unrecognized loss on securities held to maturity	(13)	[1]
FDIC's share of unrealized (gains) losses on securities available for sale under the loss share agreements	(136)	[2]	(105)	[2]
Foreign currency translation adjustment	(8)		(7)
Total	(350)		(452)
Accumulated Other Comprehensive Income (Loss) [Member]
Unrecognized net pension and postretirement costs	(359)		(368)
Unrealized net gains (losses) on cash flow hedges	(89)		(47)
Unrealized net gains (losses) on securities available for sale	122		(157)
Unrecognized loss on securities held to maturity	(21)	[1]
FDIC's share of unrealized (gains) losses on securities available for sale under the loss share agreements	(229)	[2]	(176)	[2]
Foreign currency translation adjustment	2		1
Total	$ (574)		$ (747)

[1] Represents unrealized losses on certain available for sale securities that were transferred to held to maturity classification. These losses are being amortized and recognized in net income over the remaining expected life of the underlying securities.

[2] Certain securities available for sale are covered by loss sharing agreements with the FDIC. The securities covered by the loss share agreements reflected a net unrealized pre-tax gain of $395 million and $305 million as of June 30, 2011 and December 31, 2010, respectively. The FDIC's share of this net unrealized pre-tax gain, upon sale, would have been $365 million and $281 million as of June 30, 2011 and December 31, 2010, respectively, and was recorded as a reduction in other comprehensive income.