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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 Income (Loss)
Retained Earnings
Beginning Balance (in shares) at Dec. 31, 2017 59.3 60.0      
Beginning Balance at Dec. 31, 2017 $ 1,337 $ 0 $ 1,044 $ (5) $ 298
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 107       107
Exchange of 1.625% Convertible Notes (in shares)   2.0      
Exchange of 1.625% Convertible Notes 108   108    
Other comprehensive income (loss), net (6)     (6)  
Share-based compensation 1   1    
Ending Balance (in shares) at Mar. 31, 2018   62.0      
Ending Balance at Mar. 31, 2018 $ 1,553 $ 0 1,153 (12) 412
Beginning Balance (in shares) at Dec. 31, 2017 59.3 60.0      
Beginning Balance at Dec. 31, 2017 $ 1,337 $ 0 1,044 (5) 298
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 506        
Exchange of 1.625% Convertible Notes 108        
Other comprehensive income (loss), net (4)        
Ending Balance (in shares) at Sep. 30, 2018   62.0      
Ending Balance at Sep. 30, 2018 1,561 $ 0 760 (10) 811
Beginning Balance (in shares) at Mar. 31, 2018   62.0      
Beginning Balance at Mar. 31, 2018 1,553 $ 0 1,153 (12) 412
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 202       202
Partial termination of 1.125% Warrants (113)   (113)    
Other comprehensive income (loss), net 1     1  
Share-based compensation $ 15   15    
Ending Balance (in shares) at Jun. 30, 2018 61.3 62.0      
Ending Balance at Jun. 30, 2018 $ 1,658 $ 0 1,055 (11) 614
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 197       197
Partial termination of 1.125% Warrants (306)   (306)    
Conversion of 1.625% Convertible Notes 4   4    
Other comprehensive income (loss), net 1     1  
Share-based compensation 7   7    
Ending Balance (in shares) at Sep. 30, 2018   62.0      
Ending Balance at Sep. 30, 2018 $ 1,561 $ 0 760 (10) 811
Beginning Balance (in shares) at Dec. 31, 2018 62.1 62.0      
Beginning Balance at Dec. 31, 2018 $ 1,647 $ 0 643 (8) 1,012
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 198       198
Partial termination of 1.125% Warrants (103)   (103)    
Other comprehensive income (loss), net 5     5  
Share-based compensation (in shares)   1.0      
Share-based compensation 3   3    
Ending Balance (in shares) at Mar. 31, 2019   63.0      
Ending Balance at Mar. 31, 2019 $ 1,835 $ 0 543 (3) 1,295
Beginning Balance (in shares) at Dec. 31, 2018 62.1 62.0      
Beginning Balance at Dec. 31, 2018 $ 1,647 $ 0 643 (8) 1,012
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 569        
Exchange of 1.625% Convertible Notes 0        
Other comprehensive income (loss), net 13        
Ending Balance (in shares) at Sep. 30, 2019   63.0      
Ending Balance at Sep. 30, 2019 1,831 $ 0 160 5 1,666
Beginning Balance (in shares) at Mar. 31, 2019   63.0      
Beginning Balance at Mar. 31, 2019 1,835 $ 0 543 (3) 1,295
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 196       196
Partial termination of 1.125% Warrants (321)   (321)    
Other comprehensive income (loss), net 8     8  
Share-based compensation $ 18   18    
Ending Balance (in shares) at Jun. 30, 2019 62.2 63.0      
Ending Balance at Jun. 30, 2019 $ 1,736 $ 0 240 5 1,491
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 175       175
Partial termination of 1.125% Warrants (90)   (90)    
Other comprehensive income (loss), net 0        
Share-based compensation 10   10    
Ending Balance (in shares) at Sep. 30, 2019   63.0      
Ending Balance at Sep. 30, 2019 $ 1,831 $ 0 $ 160 $ 5 $ 1,666