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Description of Business, Basis of Presentation and Significant Accounting Policies Components of Basic and Diluted Earnings Per Share (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Description of Business, Basis of Presentation and Significant Accounting Policies [Abstract]                      
Net (loss) income attributable to common stockholders $ (49) $ 78 $ (265) $ 22 $ 118 $ 94 $ 96 $ 59 $ (214) $ 367 $ 377
Weighted average outstanding shares of common stock                 139.6 155.3 163.4
Dilutive effect of employee stock options, restricted shares and other stock awards                 0.0 2.5 3.0
Common stock and common stock equivalents                 139.6 157.8 166.4
(Loss) earnings per share:                      
Basic (in usd per share) $ (0.37) $ 0.56 $ (1.87) $ 0.15 $ 0.78 $ 0.61 $ 0.61 $ 0.37 $ (1.53) $ 2.36 $ 2.31
Diluted (in usd per share) $ (0.37) $ 0.55 $ (1.87) $ 0.15 $ 0.77 $ 0.60 $ 0.60 $ 0.37 $ (1.53) $ 2.33 $ 2.27