Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	Total	Common Stocks	Preferred Stock	Additional Paid-in Capital	Retained Earnings	Treasury Stock, at Cost	Accumulated Other Comprehensive Loss, net of tax
Balance at beginning of period at Dec. 31, 2010	$ 18,700			$ 10,448	$ 10,509	$ (1,774)	$ (990)
Common Shares Outstanding, at beginning of period (in thousands) at Dec. 31, 2010		444,549
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchase of warrants				0
Issuance of shares under incentive and stock compensation plans				(43)
Tax expense on employee stock options and awards				(10)
Net income (loss)	594				594
Dividends on preferred stock					(31)
Dividends declared on common stock					(134)
Treasury stock acquired						0
Issuance of shares under incentive and stock compensation plans from treasury stock						94
Return of shares under incentive and stock compensation plans and other to treasury stock						(7)
Total other comprehensive income	2,145						2,145
Preferred Shares Outstanding (in thousands)			575
Treasury stock acquired		0
Issuance of shares under incentive and stock compensation plans		1,203
Return of shares under incentive and stock compensation plans and other to treasury stock		(238)
Balance at end of period at Sep. 30, 2011	21,362	5	556	10,395	10,938	(1,687)	1,155
Common Shares Outstanding, at end of period (in thousands) at Sep. 30, 2011		445,514
Balance at beginning of period at Jun. 30, 2011
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	60
Total other comprehensive income	1,180
Preferred Shares Outstanding (in thousands)			575
Balance at end of period at Sep. 30, 2011	21,362		556
Balance at beginning of period at Dec. 31, 2011	21,486			10,391	11,001	(1,718)	1,251
Common Shares Outstanding, at beginning of period (in thousands) at Dec. 31, 2011		442,539
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchase of warrants	300			(300)
Issuance of shares under incentive and stock compensation plans				(58)
Tax expense on employee stock options and awards				(1)
Net income (loss)	396				396
Dividends on preferred stock					(31)
Dividends declared on common stock					(131)
Treasury stock acquired	(149)					(149)
Issuance of shares under incentive and stock compensation plans from treasury stock						121
Return of shares under incentive and stock compensation plans and other to treasury stock						(7)
Total other comprehensive income	2,044						2,044
Preferred Shares Outstanding (in thousands)			575
Treasury stock acquired	(8,000)	(8,045)
Issuance of shares under incentive and stock compensation plans		1,905
Return of shares under incentive and stock compensation plans and other to treasury stock		(333)
Balance at end of period at Sep. 30, 2012	23,370	5	556	10,032	11,235	(1,753)	3,295
Common Shares Outstanding, at end of period (in thousands) at Sep. 30, 2012		436,066
Balance at beginning of period at Jun. 30, 2012
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	401
Total other comprehensive income	1,039
Preferred Shares Outstanding (in thousands)			575
Balance at end of period at Sep. 30, 2012	$ 23,370		$ 556