Consolidated Statements of Changes in Equity (Unaudited) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	Total	Preferred Stock [Member]	Common Shares [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, 2012		$ 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 Noncumulative Series A Preferred Stock						(5)
Common shares repurchased, value							(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
Beginning Balance at Dec. 31, 2013	10,320	291	1,017	4,022	7,606		(2,281)	(352)	17
Beginning Balance, Common Shares at Dec. 31, 2013			890,724
Beginning Balance, Preferred Shares at Dec. 31, 2013		2,905
Net income (loss)	242				242
Other comprehensive income (loss):
Net unrealized gains (losses) on securities available for sale, net of income taxes	29							29
Net unrealized gains (losses) on derivative financial instruments, net of income taxes	(1)							(1)
Foreign currency translation adjustments, net of income taxes	2							(2)
Net pension and postretirement benefit costs, net of income taxes	2							2
Deferred compensation				(4)
Cash dividends declared on common shares					(49)
Cash dividends declared on Noncumulative Series A Preferred Stock						(6)
Common shares repurchased, value							(130)
Common shares repurchased, shares			(9,845)
Common shares reissued (returned) for stock options and other employee benefit plans				(57)			76
Common shares reissued (returned) for stock options and other employee benefit plans, shares			3,990
Net contribution from (distribution to) noncontrolling interests									(1)
Ending Balance at Mar. 31, 2014	$ 10,419	$ 291	$ 1,017	$ 3,961	$ 7,793		$ (2,335)	$ (324)	$ 16
Ending Balance, Common Shares at Mar. 31, 2014			884,869
Ending Balance, Preferred Shares at Mar. 31, 2014		2,905