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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 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Earnings Per Share [Abstract]        
Net (loss) income attributable to common stockholders $ (265) $ 96 $ (243) $ 155
Weighted average outstanding shares of common stock (in shares) 141.9 156.9 143.6 157.7
Dilutive effect of employee stock options, restricted stock and other stock awards (in shares) 0.0 2.5 0.0 2.5
Common stock and common stock equivalents (in shares) 141.9 159.4 143.6 160.2
Earnings per share:        
Basic (in dollars per share) $ (1.87) $ 0.61 $ (1.69) $ 0.98
Diluted (in dollars per share) $ (1.87) $ 0.60 $ (1.69) $ 0.97