Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (USD $) In Millions, except Share data in Thousands	Total	Common stocks [Member]	Preferred Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Retained Earnings [Member] Scenario, Previously Reported [Member]	Retained Earnings [Member] Scenario, Adjustment [Member]	Retained Earnings [Member] Scenario, Actual [Member]	Treasury Stock, at Cost [Member]	Accumulated Other Comprehensive Loss, Net of Tax [Member]	Noncontrolling Interest [Member]
Balance at beginning of period at Dec. 31, 2009			$ 2,960	$ 8,985		$ 11,164		$ 11,190	$ (1,936)	$ (3,312)	$ 29
Common Shares Outstanding at beginning of period (in thousands) at Dec. 31, 2009		383,007
Preferred Shares Outstanding at beginning of period (in thousands) at Dec. 31, 2009			3,400
Issuance of mandatory convertible preferred stock			556
Accelerated accretion of discount from redemption of preferred stock issued to U.S. Treasury			440		(440)
Redemption of preferred stock to the U.S. Treasury			(3,400)
Common Stock		5
Issuance of shares under public offering				1,599
Issuance of shares under incentive and stock compensation plans				(108)
Tax expense on employee stock options and awards				(6)
Cumulative effect of accounting change, net of tax							26
Net income (loss)	395				395
Dividends on preferred stock					(54)
Dividends declared on common stock					(42)
Issuance of shares under incentive and stock compensation plans from treasury stock									129
Return of shares under incentive and stock compensation plans to treasury stock									(3)
Total other comprehensive income	1,933									1,933
Recognition of noncontrolling interest in other liabilities											(29)
Total stockholders' equity	18,891
Redemption of shares issued to the U.S. Treasury			(3,400)
Issuance of mandatory convertible preferred shares			575
Issuance of shares under public offering		59,590
Issuance of shares under incentive and stock compensation plans		1,639
Return of shares under incentive and stock compensation plans and other to treasury stock		(125)
Balance at end of period at Jun. 30, 2010			556	10,470	11,049				(1,810)	(1,379)	0
Common Shares Outstanding at end of period (in thousands) at Jun. 30, 2010		444,111
Preferred Shares Outstanding at end period (in thousands) at Jun. 30, 2010			575
Balance at beginning of period at Dec. 31, 2010	20,311		556	10,448		12,077		12,077	(1,774)	(1,001)
Common Shares Outstanding at beginning of period (in thousands) at Dec. 31, 2010		444,549
Preferred Shares Outstanding at beginning of period (in thousands) at Dec. 31, 2010			575
Common Stock	5	5
Issuance of shares under incentive and stock compensation plans				(45)
Tax expense on employee stock options and awards				(10)
Net income (loss)	535				535
Dividends on preferred stock					(21)
Dividends declared on common stock					(88)
Issuance of shares under incentive and stock compensation plans from treasury stock									76
Return of shares under incentive and stock compensation plans to treasury stock									(7)
Total other comprehensive income	924									924
Total stockholders' equity	21,675
Issuance of shares under incentive and stock compensation plans		972
Return of shares under incentive and stock compensation plans and other to treasury stock		(235)
Balance at end of period at Jun. 30, 2011	$ 21,675		$ 556	$ 10,393	$ 12,503				$ (1,705)	$ (77)	$ 0
Common Shares Outstanding at end of period (in thousands) at Jun. 30, 2011		445,286
Preferred Shares Outstanding at end period (in thousands) at Jun. 30, 2011			575