Consolidated Statements of Changes in Stockholders' Equity Consolidated Statement of Changes in Stockholders' Equity (USD $) In Millions, except Share data in Thousands, unless otherwise specified	Total	Stockholders' Equity, Total [Member]	Common Stocks	Preferred Stock	Additional Paid-in Capital	Retained Earnings	Treasury Stock, at Cost	Accumulated Other Comprehensive Loss, net of tax	Shares Purchased Outside of Publicly Announced Plan or Program [Member] Treasury Stock, at Cost
Balance at beginning of period at Dec. 31, 2011						$ 11,001
Common Shares Outstanding, at beginning of period at Dec. 31, 2011			442,539
Additional Paid in Capital					10,038
Treasury Stock, Value							(1,740)
Preferred Stock, Value, Outstanding				556
Adjustments to Additional Paid in Capital, Increase in Carrying Amount of Redeemable Preferred Stock				0
Common Stock, Value, Issued			5
Payments for Repurchase of Warrants	(300)				(300)
Stock Issued During Period, Value, Conversion of Convertible Securities					0
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs	0
Stock Issued During Period, Shares, Conversion of Convertible Securities			0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares under incentive and stock compensation plans					52
Tax expense on employee stock options and awards					(1)
Net Income (Loss) Attributable to Parent	(38)					(38)
Dividends on preferred stock						(42)
Dividends declared on common stock						(176)
Treasury stock acquired									(149)
Issuance of shares under incentive and stock compensation plans from treasury stock							134
Return of shares under incentive and stock compensation plans to treasury stock	(14)						(7)
Total other comprehensive income	1,592							1,592
Treasury stock acquired			(8,045)
Issuance of shares under incentive and stock compensation plans			2,156
Return of shares under incentive and stock compensation plans and other to treasury stock			(344)
Adjustments to Additional Paid in Capital, Stock Issued, Own-share Lending Arrangement, Issuance Costs	0
Retained Earnings (Accumulated Deficit)						10,745
Stock Issued During Period, Shares, Warrant Exercised			0
Accumulated Other Comprehensive Income (Loss), Net of Tax	2,843							2,843
Balance at end of period at Dec. 31, 2012		22,447				10,745
Common Shares Outstanding, at end of period at Dec. 31, 2012			436,306
Preferred Shares Outstanding, end of period at Dec. 31, 2012				575
Additional Paid in Capital	9,894				9,894
Treasury Stock, Value	(1,598)						(1,598)
Preferred Stock, Value, Outstanding				0
Adjustments to Additional Paid in Capital, Increase in Carrying Amount of Redeemable Preferred Stock				556
Common Stock, Value, Issued	5
Payments for Repurchase of Warrants	(33)				(33)
Stock Issued During Period, Value, Conversion of Convertible Securities					(556)
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs					(634)
Stock Issued During Period, Shares, Conversion of Convertible Securities			21,178
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares under incentive and stock compensation plans					36
Tax expense on employee stock options and awards					3
Net Income (Loss) Attributable to Parent	176					176
Dividends on preferred stock						(10)
Dividends declared on common stock						(228)
Treasury stock acquired									(600)
Issuance of shares under incentive and stock compensation plans from treasury stock							125
Return of shares under incentive and stock compensation plans to treasury stock	(20)						(17)
Total other comprehensive income	(2,922)							(2,922)
Treasury stock acquired			(19,235)
Issuance of shares under incentive and stock compensation plans			2,136
Return of shares under incentive and stock compensation plans and other to treasury stock			(592)
Adjustments to Additional Paid in Capital, Stock Issued, Own-share Lending Arrangement, Issuance Costs							634
Retained Earnings (Accumulated Deficit)	10,683					10,683
Stock Issued During Period, Shares, Warrant Exercised			13,497
Accumulated Other Comprehensive Income (Loss), Net of Tax	(79)							(79)
Balance at end of period at Dec. 31, 2013	18,905
Common Shares Outstanding, at end of period at Dec. 31, 2013			453,290
Preferred Shares Outstanding, end of period at Dec. 31, 2013				0
Balance at beginning of period at Jun. 30, 2013
Additional Paid in Capital					9,894
Treasury Stock, Value							(1,598)
Preferred Stock, Value, Outstanding				0
Common Stock, Value, Issued			5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss) Attributable to Parent	293
Retained Earnings (Accumulated Deficit)						10,683
Accumulated Other Comprehensive Income (Loss), Net of Tax								(79)
Balance at end of period at Sep. 30, 2013		18,905
Common Shares Outstanding, at end of period at Sep. 30, 2013			453,290
Balance at beginning of period at Dec. 31, 2013	18,905
Common Shares Outstanding, at beginning of period at Dec. 31, 2013			453,290
Preferred Shares Outstanding, beginning of period at Dec. 31, 2013				0
Additional Paid in Capital	9,123				9,123
Treasury Stock, Value	(2,527)						(2,527)
Preferred Stock, Value, Outstanding				0
Adjustments to Additional Paid in Capital, Increase in Carrying Amount of Redeemable Preferred Stock				0
Common Stock, Value, Issued	5		5
Payments for Repurchase of Warrants	0				0
Stock Issued During Period, Value, Conversion of Convertible Securities					0
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs					(801)
Stock Issued During Period, Shares, Conversion of Convertible Securities			0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares under incentive and stock compensation plans					(24)
Tax expense on employee stock options and awards					6
Net Income (Loss) Attributable to Parent	798					798
Dividends on preferred stock						0
Dividends declared on common stock						(290)
Treasury stock acquired									(1,796)
Issuance of shares under incentive and stock compensation plans from treasury stock							82
Return of shares under incentive and stock compensation plans to treasury stock	(30)						(16)
Total other comprehensive income	1,007							1,007
Treasury stock acquired			(49,518)
Issuance of shares under incentive and stock compensation plans			2,003
Return of shares under incentive and stock compensation plans and other to treasury stock			(439)
Adjustments to Additional Paid in Capital, Stock Issued, Own-share Lending Arrangement, Issuance Costs							801
Retained Earnings (Accumulated Deficit)	11,191					11,191
Stock Issued During Period, Shares, Warrant Exercised			19,080
Accumulated Other Comprehensive Income (Loss), Net of Tax	928							928
Balance at end of period at Dec. 31, 2014	$ 18,720	$ 18,720
Common Shares Outstanding, at end of period at Dec. 31, 2014			424,416
Preferred Shares Outstanding, end of period at Dec. 31, 2014				0