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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (USD $)
In Millions
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Treasury Stock [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Balance at Dec. 31, 2009 $ 18,095 $ 6,015 $ 46,793 $ (582) $ (33,779) $ (352)
Balance (in shares) at Dec. 31, 2009   3,007 [1]   34    
Net loss (3,465)       (3,465)  
Other comprehensive income (loss) (150)         (150)
Stock Issued During Period, Shares, New Issues   1        
Stock Issued During Period, Value, New Issues   1        
Stock Issued During Period, Shares, Treasury Stock Reissued       (14)    
Stock Issued During Period, Value, Treasury Stock Reissued 8   (1) 355 (347)  
Share-based compensation expense 59   59      
Other, net (1)   (10)   9  
Balance at Dec. 31, 2010 14,546 6,016 46,841 (227) (37,582) (502)
Balance (in shares) at Dec. 31, 2010   3,008 [1]   20    
Net loss (2,890)       (2,890)  
Other comprehensive income (loss) (290)         (290)
Stock Issued During Period, Shares, New Issues   7        
Stock Issued During Period, Value, New Issues   14        
Stock Issued During Period, Shares, Treasury Stock Reissued       (1)    
Stock Issued During Period, Value, Treasury Stock Reissued 18   0 21 (17)  
Share-based compensation expense 43   43      
Stock Issued During Period, Shares, Conversion of Convertible Securities   (19)   (19)    
Stock Issued During Period, Value, Conversion of Convertible Securities 0 (38) (168) 206    
Balance at Dec. 31, 2011 11,427 5,992 46,716 0 (40,489) (792)
Balance (in shares) at Dec. 31, 2011   2,996 [1]   0    
Net loss (4,326)       (4,326)  
Other comprehensive income (loss) (341)         (341)
Stock Issued During Period, Shares, New Issues   14        
Stock Issued During Period, Value, New Issues 29 27 2      
Share-based compensation expense 44   44      
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt 254   254      
Balance at Dec. 31, 2012 $ 7,087 $ 6,019 $ 47,016 $ 0 $ (44,815) $ (1,133)
Balance (in shares) at Dec. 31, 2012   3,010 [1]   0    
[1] (1)See note 14 for information regarding common shares.