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Net Income (Loss) per Share (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Numerator:                    
Net income (loss) $ 197 $ 202 $ 107 $ (97) $ (230) $ 77 $ 506 $ (250)    
Denominator:                    
Shares outstanding at the beginning of the period (in shares)   61.3     56.5       59.3 55.8
Exchange of 1.625% Notes (in shares) 0.0     0.0     1.3 0.0    
Stock-based compensation (in shares) 0.0     0.0     0.2 0.4    
Denominator for basic net income per share (in shares) 61.3     56.5     60.8 56.2    
Effect of dilutive securities:                    
1.125% Warrants (in shares) 5.6     0.0     5.0 0.0    
1.625% Notes (in shares) 0.6     0.0     0.5 0.0    
Stock-based compensation (in shares) 0.4     0.0     0.3 0.0    
Denominator for diluted net income per share (in shares) 67.9     56.5     66.6 56.2    
Net income (loss) per share:                    
Basic (in dollars per share) $ 3.22     $ (1.70)     $ 8.32 $ (4.44)    
Diluted (in dollars per share) $ 2.90     $ (1.70)     $ 7.60 $ (4.44)    
Potentially dilutive common shares excluded from calculations:                    
Stock-based compensation (in shares) 0.0     0.2     0.0 0.3    
Cash Convertible Senior Notes Due 2020, Warrants                    
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 (in shares) 0.0     2.3     0.0 1.3    
1.625% Notes                    
Potentially dilutive common shares excluded from calculations:                    
Potentially dilutive common shares excluded from calculations (in shares) 0.0     0.6     0.0 0.3    
Convertible Notes | 1.625% Notes                    
Potentially dilutive common shares excluded from calculations:                    
Percentage of contractual interest rate 1.625%           1.625%