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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, 2015   131      
Beginning balance at Dec. 31, 2015 $ 849 $ 1 $ 1,128 $ (204) $ (76)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income (loss) 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)
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 income (loss) (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    
Repurchases of Company common stock, retired (in shares)   (11)      
Repurchases of common stock, retired (351)     (351)  
Pension and postemployment benefit plans, net of tax (1)       (1)
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)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income (loss) 30     30  
Net income (loss) | Accounting Standards Update 2014-09 33        
Employee stock compensation, employee stock purchase programs and option exercises (in shares)   2      
Employee stock compensation, employee stock purchase programs and option exercises 98   98    
Purchases of treasury stock, retired (in shares)   (7)      
Repurchases of common stock, retired (300)     (300)  
Pension and postemployment benefit plans, net of tax (8)       (8)
Unrealized loss on derivatives, net of tax (6)       (6)
Currency translation adjustment (13)       (13)
Ending balance (in shares) at Dec. 31, 2018   117      
Ending balance at Dec. 31, 2018 $ 495 $ 1 $ 1,418 $ (823) $ (101)