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Consolidated Statements of Stockholders' Equity - USD ($)
shares in Millions, $ in Millions
Total
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Loss
Retained Earnings
Beginning Balance, shares at Dec. 31, 2014 49 50      
Beginning Balance at Dec. 31, 2014 $ 1,010 $ 0 $ 396 $ (1) $ 615
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net (loss) income 143       143
Other comprehensive income (loss), net (3)     (3)  
Common stock offering, including issuance costs, shares   6      
Common stock offering, including issuance costs 373   373    
1.625% Convertible Notes exchange transaction 0        
Share-based compensation, shares   0      
Share-based compensation 26 $ 0 26    
Tax benefit from share-based compensation $ 8   8    
Ending Balance, shares at Dec. 31, 2015 55 56      
Ending Balance at Dec. 31, 2015 $ 1,557 $ 0 803 (4) 758
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net (loss) income 52       52
Other comprehensive income (loss), net 2     2  
1.625% Convertible Notes exchange transaction 0        
Share-based compensation, shares   1      
Share-based compensation 36 $ 0 36    
Tax benefit from share-based compensation $ 2   2    
Ending Balance, shares at Dec. 31, 2016 56 57      
Ending Balance at Dec. 31, 2016 $ 1,649 $ 0 841 (2) 810
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net (loss) income (512)       (512)
Other comprehensive income (loss), net (3)     (3)  
Issuance of common stock in connection with 1.625% Notes exchange, shares   3      
1.625% Convertible Notes exchange transaction 161   161    
Share-based compensation, shares   0      
Share-based compensation 42 $ 0 42    
Ending Balance, shares at Dec. 31, 2017   60      
Ending Balance at Dec. 31, 2017 $ 1,337 $ 0 $ 1,044 $ (5) $ 298