Consolidated Statements of Changes in Equity (USD $) In Millions, except Share data in Thousands, unless otherwise specified	Total	Preferred Stock [Member]	Common Stock [Member]	Capital Surplus [Member]	Retained Earnings [Member]	Retained Earnings [Member] Series A Preferred Stock [Member]	Treasury Stock, at Cost [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interests [Member]
Beginning Balance at Dec. 31, 2011		$ 291	$ 1,017	$ 4,194	$ 6,246		$ (1,815)	$ (28)	$ 17
Beginning Balance, Common Shares at Dec. 31, 2011			953,008
Beginning Balance, Preferred Shares at Dec. 31, 2011		2,905
Net income (loss)	200				200
Other comprehensive income (loss):
Net unrealized gains (losses) on securities available for sale, net of income taxes	(11)							(11)
Net unrealized gains (losses) on derivative financial instruments, net of income taxes	12							12
Foreign currency translation adjustments, net of income taxes	6							6
Net pension and postretirement benefit costs, net of income taxes	2							2
Deferred compensation				4
Cash dividends declared on common shares					(29)
Cash dividends declared on Preferred Stock						(6)
Common shares reissued (returned) for stock options and other employee benefit plans				(82)			98
Common shares reissued (returned) for stock options and other employee benefit plans, shares			3,094
Ending Balance at Mar. 31, 2012	10,116	291	1,017	4,116	6,411		(1,717)	(19)	17
Ending Balance, Common Shares at Mar. 31, 2012			956,102
Ending Balance, Preferred Shares at Mar. 31, 2012		2,905
Beginning Balance at Dec. 31, 2012	10,309	291	1,017	4,126	6,913		(1,952)	(124)	38
Beginning Balance, Common Shares at Dec. 31, 2012			925,769
Beginning Balance, Preferred Shares at Dec. 31, 2012		2,905
Net income (loss)	205				204				1
Other comprehensive income (loss):
Net unrealized gains (losses) on securities available for sale, net of income taxes	(22)							(22)
Net unrealized gains (losses) on derivative financial instruments, net of income taxes	(8)							(8)
Foreign currency translation adjustments, net of income taxes	(11)							(11)
Net pension and postretirement benefit costs, net of income taxes	3							3
Deferred compensation				4
Cash dividends declared on common shares					(47)
Cash dividends declared on Preferred Stock						(5)
Common shares repurchased, Value	(65)						(65)
Common shares repurchased, shares			(6,790)
Common shares reissued (returned) for stock options and other employee benefit plans				(71)			87
Common shares reissued (returned) for stock options and other employee benefit plans, shares			3,602
Ending Balance at Mar. 31, 2013	$ 10,379	$ 291	$ 1,017	$ 4,059	$ 7,065		$ (1,930)	$ (162)	$ 39
Ending Balance, Common Shares at Mar. 31, 2013			922,581
Ending Balance, Preferred Shares at Mar. 31, 2013		2,905