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	Common Stocks	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Stockholders' Equity, Total [Member]	Shares Purchased Outside of Publicly Announced Plan or Program [Member] Treasury Stock [Member]
Treasury Stock, Value at Dec. 31, 2013					$ (1,598)
Additional Paid in Capital at Dec. 31, 2013			9,894
Common Shares Outstanding, at beginning of period (in thousands) at Dec. 31, 2013		453,290
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs			318
Adjustments to Additional Paid in Capital, Share-based Compensation, Employee Stock Purchase Program, Requisite Service Period Recognition			(49)
Allocated Share-based Compensation Expense	19
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Value, Issued		5
Adjustments to Additional Paid in Capital [Abstract]
Tax expense on employee stock options and awards			3
Retained Earnings (Accumulated Deficit) [Abstract]
Retained Earnings (Accumulated Deficit)				11,111
Net Income (Loss) Attributable to Parent	495			495
Dividends, Common Stock, Cash				67
Treasury Stock Transactions, Excluding Value of Shares Reissued [Abstract]
Treasury stock acquired								(300)
Issuance of shares under incentive and stock compensation plans from treasury stock					(43)
Return of shares under incentive and stock compensation plans and other to treasury stock	(30)				(13)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Income (Loss), Net of Tax	659					659
Total other comprehensive income	738					738
Total stockholders' equity							19,774
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Treasury stock acquired		(8,821)
Issuance of shares under incentive and stock compensation plans		996
Return of shares under incentive and stock compensation plans and other to treasury stock		(357)
Issuance of Shares for Warrant Exercise		7,378
Adjustments to Additional Paid in Capital, Stock Issued, Own-share Lending Arrangement, Issuance Costs					318
Treasury Stock, Value at Mar. 31, 2014					(1,550)
Common Shares Outstanding, at end of period (in thousands) at Mar. 31, 2014		452,486
Treasury Stock, Value at Dec. 31, 2014	(2,527)				(2,527)
Additional Paid in Capital at Dec. 31, 2014	9,123		9,123
Common Shares Outstanding, at beginning of period (in thousands) at Dec. 31, 2014		424,416
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs			19
Adjustments to Additional Paid in Capital, Share-based Compensation, Employee Stock Purchase Program, Requisite Service Period Recognition			(150)
Allocated Share-based Compensation Expense	16
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Value, Issued	5	5
Adjustments to Additional Paid in Capital [Abstract]
Tax expense on employee stock options and awards			26
Retained Earnings (Accumulated Deficit) [Abstract]
Retained Earnings (Accumulated Deficit)	11,583			11,583
Net Income (Loss) Attributable to Parent	467			467
Dividends, Common Stock, Cash				75
Treasury Stock Transactions, Excluding Value of Shares Reissued [Abstract]
Treasury stock acquired								(250)
Issuance of shares under incentive and stock compensation plans from treasury stock					(154)
Return of shares under incentive and stock compensation plans and other to treasury stock					(53)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Income (Loss), Net of Tax	1,150					1,150
Total other comprehensive income	222					222
Total stockholders' equity	19,077						19,077
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Treasury stock acquired		(6,128)
Issuance of shares under incentive and stock compensation plans		3,923
Return of shares under incentive and stock compensation plans and other to treasury stock		(1,299)
Issuance of Shares for Warrant Exercise		477
Adjustments to Additional Paid in Capital, Stock Issued, Own-share Lending Arrangement, Issuance Costs					19
Treasury Stock, Value at Mar. 31, 2015	$ (2,657)				$ (2,657)
Common Shares Outstanding, at end of period (in thousands) at Mar. 31, 2015		421,389