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Net Income per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Dec. 31, 2014
Earnings Per Share [Abstract]                
Net income $ 42 $ 46 $ 99 $ 113        
Denominator:                
Shares outstanding at the beginning of the period (in shares)         56 55 55 49
Weighted-average number of shares: Issued in common stock offering (in shares) 0 0 0 2        
Denominator for basic net income per share (in shares) 56 55 55 51        
Effect of dilutive securities:                
Share-based compensation (in shares) 0 0 0 1        
Convertible senior notes (in shares) [1] 0 1 0 1        
1.125% Warrants (in shares) [1] 0 4 1 2        
Denominator for diluted net income per share (in shares) 56 60 56 55        
Net income per share:                
Basic (in dollars per share) [2] $ 0.77 $ 0.84 $ 1.79 $ 2.21        
Diluted (in dollars per share) [2] $ 0.76 $ 0.77 $ 1.77 $ 2.07        
1.125% Call Option                
Potentially dilutive common shares excluded from calculations:                
Percentage of contractual interest rate 1.125% 1.125% 1.125% 1.125%   1.125%    
[1] For more information regarding the convertible senior notes, refer to Note 10, "Debt." For more information regarding the 1.125% Warrants, refer to Note 12, "Stockholders' Equity."
[2] Source data for calculations in thousands.