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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, 2013 46 46      
Beginning Balance at Dec. 31, 2013 $ 893 $ 0 $ 341 $ (1) $ 553
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 62       62
Other comprehensive income (loss), net 0        
Convertible senior notes transactions, including issuance costs, in shares   2      
Convertible senior notes transactions, including issuance costs 22   22    
Share-based compensation, shares   2      
Share-based compensation 30 $ 0 30    
Tax benefit from share-based compensation $ 3   3    
Ending Balance, shares at Dec. 31, 2014 49 50      
Ending Balance at Dec. 31, 2014 $ 1,010 $ 0 396 (1) 615
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 143       143
Other comprehensive income (loss), net (3)     (3)  
Common stock offering transaction, including issuance costs, shares   6      
Common stock offering transaction, including issuance costs 373   373    
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 income 52       52
Other comprehensive income (loss), net 2     2  
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   57      
Ending Balance at Dec. 31, 2016 $ 1,649 $ 0 $ 841 $ (2) $ 810