Consolidated Statements of Changes in Equity (USD $) In Millions, except Share data in Thousands, unless otherwise specified	Total	Series B Preferred Stock [Member]	Preferred Stock [Member]	Preferred Stock [Member] Series B Preferred Stock [Member]	Common stock [Member]	Common Stock Warrant [Member]	Capital Surplus [Member]	Retained Earnings [Member]	Retained Earnings [Member] Series A Preferred Stock [Member]	Retained Earnings [Member] Series B Preferred Stock [Member]	Treasury Stock, at Cost [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interests [Member]
Beginning Balance at Dec. 31, 2009			$ 2,721		$ 946	$ 87	$ 3,734	$ 5,158			$ (1,980)	$ (3)	$ 270
Beginning Balance, Common Shares at Dec. 31, 2009					878,535
Beginning Balance, Preferred Shares at Dec. 31, 2009			2,930
Correction of an error in cumulative effect adjustment								45
Net income (loss)	584							554					30
Other comprehensive income (loss):
Net unrealized gains (losses) on securities available for sale, net of income taxes	116											116
Net unrealized gains (losses) on derivative financial instruments, net of income taxes	(106)											(106)
Foreign currency translation adjustments, net of income taxes	4											4
Net pension and postretirement benefit costs, net of income taxes	(28)											(28)
Deferred compensation							19
Cash dividends declared on common shares								(36)
Cash dividends declared on Preferred Stock									(23)	(125)
Amortization of discount on Series B Preferred Stock				16						(16)
Common shares reissued (returned) for stock options and other employee benefit plans							(42)				76
Common shares reissued (returned) for stock options and other employee benefit plans, shares					2,073
Net contribution from (distribution to) noncontrolling interests													(43)
Ending Balance at Dec. 31, 2010			2,737		946	87	3,711	5,557			(1,904)	(17)	257
Ending Balance, Common Shares at Dec. 31, 2010					880,608
Beginning Balance, Preferred Shares at Dec. 31, 2010			2,930
Correction of an error in cumulative effect adjustment								(30)
Net income (loss)	932							920					12
Other comprehensive income (loss):
Net unrealized gains (losses) on securities available for sale, net of income taxes	77											77
Net unrealized gains (losses) on derivative financial instruments, net of income taxes	(10)											(10)
Foreign currency translation adjustments, net of income taxes	(4)											(4)
Net pension and postretirement benefit costs, net of income taxes	(74)											(74)
Deferred compensation							(2)
Cash dividends declared on common shares								(94)
Common shares repurchased		(2,500)
Cash dividends declared on Preferred Stock									(23)	(31)
Preferred Stock - TARP redemption, Value			(2,451)					(49)
Preferred Stock - TARP redemption, Shares			(25)
Repurchase of common stock warrant						(87)	17
Amortization of discount on Series B Preferred Stock				4						(4)
Common shares issuance, Value					71		533
Common shares issuance, Shares					70,621
Common shares reissued (returned) for stock options and other employee benefit plans							(65)				89
Common shares reissued (returned) for stock options and other employee benefit plans, shares					1,779
Other			1
Net contribution from (distribution to) noncontrolling interests													(252)
Ending Balance at Dec. 31, 2011	9,922		291		1,017		4,194	6,246			(1,815)	(28)	17
Ending Balance, Common Shares at Dec. 31, 2011					953,008
Ending Balance, Preferred Shares at Dec. 31, 2011			2,905
Net income (loss)	865							858					7
Other comprehensive income (loss):
Net unrealized gains (losses) on securities available for sale, net of income taxes	(98)											(98)
Net unrealized gains (losses) on derivative financial instruments, net of income taxes	20											20
Foreign currency translation adjustments, net of income taxes	10											10
Net pension and postretirement benefit costs, net of income taxes	(28)											(28)
Deferred compensation							17
Cash dividends declared on common shares								(169)
Common shares repurchased											(251)
Cash dividends declared on Preferred Stock									(22)
Common shares repurchased, shares					(30,637)
Common shares reissued (returned) for stock options and other employee benefit plans							(85)				114
Common shares reissued (returned) for stock options and other employee benefit plans, shares					3,398
Net contribution from (distribution to) noncontrolling interests													14
Ending Balance at Dec. 31, 2012	$ 10,309		$ 291		$ 1,017		$ 4,126	$ 6,913			$ (1,952)	$ (124)	$ 38
Ending Balance, Common Shares at Dec. 31, 2012					925,769
Ending Balance, Preferred Shares at Dec. 31, 2012			2,905