Condensed Consolidated Statements of Changes in Stockholders' Equity Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	Total USD ($)	Common Stocks USD ($)	Preferred Stock USD ($)	Additional Paid-in Capital [Member] USD ($)	Retained Earnings [Member] USD ($)	Treasury Stock [Member] USD ($)	Accumulated Other Comprehensive Income (Loss) [Member] USD ($)	Stockholders' Equity, Total [Member] USD ($)	Shares Purchased Outside of Publicly Announced Plan or Program [Member] Treasury Stock [Member] USD ($)	Accelerated Share Repurchase Program [Member]	Accelerated Share Repurchase Program [Member] Additional Paid-in Capital [Member] USD ($)	Accelerated Share Repurchase Program [Member] Treasury Stock [Member] USD ($)
Treasury Stock, Value at Dec. 31, 2012						$ (1,740)
Additional Paid in Capital at Dec. 31, 2012				10,038
Common Shares Outstanding, at beginning of period (in thousands) at Dec. 31, 2012		436,306
Preferred Stock, Including Additional Paid in Capital [Abstract]
Preferred Stock, Value, Outstanding			0
Common Stock, Value, Issued		5
Adjustments to Additional Paid in Capital [Abstract]
Repurchase of warrants	(33)			(33)
Stock Repurchased During Period, Value											0
Issuance of shares under incentive and stock compensation plans				47
Tax expense on employee stock options and awards				3
Stock Issued During Period, Value, Conversion of Convertible Securities			(556)	(556)
Adjustments to Additional Paid in Capital, Warrant Issued				103
Retained Earnings (Accumulated Deficit) [Abstract]
Retained Earnings (Accumulated Deficit)					10,439
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(138)				(138)
Dividends, Preferred Stock					10
Dividends, Common Stock, Cash					158
Treasury Stock Transactions, Excluding Value of Shares Reissued [Abstract]
Treasury stock acquired									(105)
Issuance of shares under incentive and stock compensation plans from treasury stock						(114)
Return of shares under incentive and stock compensation plans and other to treasury stock						(15)
Stock Issued During Period, Value, Warrants Exercise						103
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(17)						(17)
Total other comprehensive income	(2,860)						(2,860)
Total stockholders' equity								18,928
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Treasury stock acquired		(12,680)
Issuance of shares under incentive and stock compensation plans		2,101
Return of shares under incentive and stock compensation plans and other to treasury stock		(548)
Stock Issued During Period, Shares, Conversion of Convertible Securities		21,178
Issuance of Shares for Warrant Exercise		2,136
Treasury Stock, Value at Sep. 30, 2013						(1,913)
Common Shares Outstanding, at end of period (in thousands) at Sep. 30, 2013		448,493
Treasury Stock, Value at Dec. 31, 2013	(1,598)					(1,598)
Additional Paid in Capital at Dec. 31, 2013	9,894			9,894
Common Shares Outstanding, at beginning of period (in thousands) at Dec. 31, 2013		453,290
Preferred Stock, Including Additional Paid in Capital [Abstract]
Preferred Stock, Value, Outstanding			0
Common Stock, Value, Issued	5	5
Adjustments to Additional Paid in Capital [Abstract]
Repurchase of warrants	0			0
Issuance of shares under incentive and stock compensation plans				12
Tax expense on employee stock options and awards				4
Stock Issued During Period, Value, Conversion of Convertible Securities			0	0
Adjustments to Additional Paid in Capital, Warrant Issued				766
Retained Earnings (Accumulated Deficit) [Abstract]
Retained Earnings (Accumulated Deficit)	10,886				10,886
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	416				416
Dividends, Preferred Stock					0
Dividends, Common Stock, Cash					213
Treasury Stock Transactions, Excluding Value of Shares Reissued [Abstract]
Treasury stock acquired	(1,365)								(971)			(394)
Issuance of shares under incentive and stock compensation plans from treasury stock						(65)
Return of shares under incentive and stock compensation plans and other to treasury stock						(14)
Stock Issued During Period, Value, Warrants Exercise						766
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Income (Loss), Net of Tax	1,077						1,077
Total other comprehensive income	1,156						1,156
Total stockholders' equity	18,835							18,835
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Treasury stock acquired		(39,066)
Issuance of shares under incentive and stock compensation plans		1,562
Return of shares under incentive and stock compensation plans and other to treasury stock		(393)
Stock Issued During Period, Shares, Conversion of Convertible Securities		0
Issuance of Shares for Warrant Exercise		18,177
Treasury Stock, Value at Sep. 30, 2014	(2,146)					(2,146)
Common Shares Outstanding, at end of period (in thousands) at Sep. 30, 2014		433,570
Treasury Stock, Value at Jun. 30, 2014
Preferred Stock, Including Additional Paid in Capital [Abstract]
Common Stock, Value, Issued	5	5
Adjustments to Additional Paid in Capital [Abstract]
Stock Repurchased During Period, Value											(131)
Retained Earnings (Accumulated Deficit) [Abstract]
Retained Earnings (Accumulated Deficit)	10,886
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	388
Treasury Stock Transactions, Excluding Value of Shares Reissued [Abstract]
Treasury stock acquired	0
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Income (Loss), Net of Tax	1,077
Total other comprehensive income	(85)
Total stockholders' equity	18,835							18,835
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Treasury stock acquired		(20,100)								(11,200)
Treasury Stock, Value at Sep. 30, 2014	$ (2,146)
Common Shares Outstanding, at end of period (in thousands) at Sep. 30, 2014		433,570