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Earnings per Share - Components of Basic and Diluted Earnings Per Share (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Earnings Per Share [Abstract]        
Net income (loss) attributable to common stockholders $ 78 $ 94 $ (165) $ 249
Weighted average outstanding shares of common stock (in shares) 139.2 154.5 142.1 156.6
Dilutive effect of employee stock options, restricted stock and other stock awards (in shares) 2.2 2.6 0.0 2.5
Common stock and common stock equivalents (in shares) 141.4 157.1 142.1 159.1
Earnings (loss) per share:        
Basic (in dollars per share) $ 0.56 $ 0.61 $ (1.16) $ 1.59
Diluted (in dollars per share) $ 0.55 $ 0.60 $ (1.16) $ 1.57