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Net Income per Share (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Numerator:    
Net income $ 77 $ 24
Denominator:    
Denominator for basic net income per share (in shares) 56 55
Effect of dilutive securities:    
Share-based compensation (in shares) 0 1
1.125% Warrants (in shares) 0 1
Denominator for diluted net income per share (in shares) 56 57
Net income per share:    
Basic (in dollars per share) $ 1.38 $ 0.44
Diluted (in dollars per share) $ 1.37 $ 0.43
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Stated percentage of warrants 1.125%  
1.125% Call Option    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Percentage of contractual interest rate on Call Option 1.125%