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Consolidated Statements of Changes in Stockholders' Equity - USD ($)
shares in Millions, $ in Millions
Total
Common Stock
Treasury Stock
Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Beginning Balance (in shares) at Dec. 31, 2012   190 24      
Beginning Balance at Dec. 31, 2012 $ 1,779 $ 2 $ (806) $ 898 $ 1,656 $ 29
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net (loss) income 377       377  
Employee stock compensation, employee stock purchase programs and option exercises (in shares)   1        
Employee stock compensation, employee stock purchase programs and option exercises 68     68    
Income tax benefit from stock compensation plans 7     7    
Treasury stock (in shares)     (8)      
Purchases of treasury stock, not retired (378)   $ (378)      
Pension and postemployment benefit plans, net of tax 2         2
Unrealized gain on securities 0          
Currency translation adjustment 2         2
Ending Balance (in shares) at Dec. 31, 2013   191 32      
Ending Balance at Dec. 31, 2013 1,857 $ 2 $ (1,184) 973 2,033 33
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net (loss) income 367       367  
Employee stock compensation, employee stock purchase programs and option exercises (in shares)   2        
Employee stock compensation, employee stock purchase programs and option exercises   $ (1)        
Employee stock compensation, employee stock purchase programs and option exercises 77     78    
Income tax benefit from stock compensation plans 3     3    
Retirement of common stock previously held as treasury 0   $ 1,184   (1,184)  
Treasury stock (in shares)   (32) 32      
Repurchases of Company common stock retired (in shares)   (13)        
Repurchases of Company common stock, retired (560)       (560)  
Pension and postemployment benefit plans, net of tax (21)         (21)
Unrealized gain on securities 31         31
Currency translation adjustment (47)         (47)
Ending Balance (in shares) at Dec. 31, 2014   148 0      
Ending Balance at Dec. 31, 2014 1,707 $ 1 $ 0 1,054 656 (4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net (loss) income (214)       (214)  
Employee stock compensation, employee stock purchase programs and option exercises (in shares)   2        
Employee stock compensation, employee stock purchase programs and option exercises 78     78    
Income tax expense for stock compensation plans (4)     (4)    
Repurchases of Company common stock retired (in shares)   (19)        
Repurchases of Company common stock, retired (646)       (646)  
Pension and postemployment benefit plans, net of tax (5)         (5)
Unrealized gain on securities (31)         (31)
Currency translation adjustment (36)         (36)
Ending Balance (in shares) at Dec. 31, 2015   131 0      
Ending Balance at Dec. 31, 2015 $ 849 $ 1 $ 0 $ 1,128 $ (204) $ (76)