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Net Income per Share (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Numerator:        
Net income $ 198 $ 107    
Denominator:        
Shares outstanding at the beginning of the period (in shares)     62.1 59.3
Exchange of 1.625% Notes (in shares) 0.0 0.5    
Denominator for basic net income per share (in shares) 62.1 59.8    
Effect of dilutive securities:        
1.125% Warrants (in shares) 3.5 4.4    
1.625% Notes (in shares) 0.0 0.7    
Stock-based compensation (in shares) 0.6 0.3    
Denominator for diluted net income per share (in shares) 66.2 65.2    
Net income per share:        
Basic (in dollars per share) $ 3.19 $ 1.79    
Diluted (in dollars per share) $ 2.99 $ 1.64    
Potentially dilutive common shares excluded from calculations: (1)        
Stock-based compensation (in shares) 0.1 0.4    
1.125% Warrants        
Potentially dilutive common shares excluded from calculations: (1)        
Stated percentage of warrants 1.125%      
1.625% Notes        
Potentially dilutive common shares excluded from calculations: (1)        
Stated percentage of warrants 1.625%