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Consolidated Statements of Changes in Stockholders' Equity - USD ($)
shares in Millions, $ in Millions
Total
Common Stock
Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Beginning Balance (in shares) at Dec. 31, 2014   148      
Beginning Balance at Dec. 31, 2014 $ 1,707 $ 1 $ 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 benefit from stock compensation plans (4)   (4)    
Repurchases of Company common stock, retired (in shares)   (19)      
Repurchases of 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      
Ending Balance at Dec. 31, 2015 849 $ 1 1,128 (204) (76)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net (loss) income 125     125  
Employee stock compensation, employee stock purchase programs and option exercises (in shares)   3      
Employee stock compensation, employee stock purchase programs and option exercises 92   92    
Repurchases of Company common stock, retired (in shares)   (3)      
Repurchases of common stock, retired (82)     (82)  
Pension and postemployment benefit plans, net of tax (6)       (6)
Unrealized gain on securities 0        
Currency translation adjustment (7)       (7)
Ending Balance (in shares) at Dec. 31, 2016   131      
Ending Balance at Dec. 31, 2016 971 $ 1 1,220 (161) (89)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net (loss) income (67)     (67)  
Employee stock compensation, employee stock purchase programs and option exercises (in shares)   2      
Employee stock compensation, employee stock purchase programs and option exercises 100   100    
Purchases of treasury stock, retired (in shares)   (11)      
Repurchases of common stock, retired (351)     (351)  
Pension and postemployment benefit plans, net of tax (1)       (1)
Unrealized gain on securities 0        
Currency translation adjustment 16       16
Ending Balance (in shares) at Dec. 31, 2017   122      
Ending Balance at Dec. 31, 2017 $ 668 $ 1 $ 1,320 $ (579) $ (74)