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Net (Loss) Income per Share (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Numerator:        
Net (loss) income $ (230) $ 33 $ (153) $ 57
Denominator:        
Denominator for basic net (loss) income per share (in shares) 56 55 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) 56 55 56 56
Net (loss) income per share:        
Basic (in dollars per share) $ (4.10) $ 0.58 $ (2.74) $ 1.02
Diluted (in dollars per share) $ (4.10) $ 0.58 $ (2.74) $ 1.01
Potentially dilutive common shares excluded from calculations:        
1.125% Warrants 2 0 1 0
Stated percentage of warrants 1.125%   1.125%