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Net (Loss) Income per Share (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Numerator:        
Net (loss) income $ (97) $ 42 $ (250) $ 99
Denominator:        
Denominator for basic net (loss) income per share (in shares) 57 56 56 55
Effect of dilutive securities:        
1.125% Warrants (in shares) 0 0 0 1
Denominator for diluted net (loss) income per share (in shares) 57 56 56 56
Net (loss) income per share:        
Basic (in dollars per share) $ (1.70) $ 0.77 $ (4.44) $ 1.79
Diluted (in dollars per share) $ (1.70) $ 0.76 $ (4.44) $ 1.77
Potentially dilutive common shares excluded from calculations:        
Stated percentage of warrants 1.125%   1.125%  
1.125% Warrants        
Potentially dilutive common shares excluded from calculations:        
Potentially dilutive common shares excluded from calculations 2 0 2 0
1.625% Notes        
Potentially dilutive common shares excluded from calculations:        
Potentially dilutive common shares excluded from calculations 1 0 0 0