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Earnings per Share (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Earnings Per Share [Abstract]        
Net (loss) income attributable to common stockholders $ (1) $ 10 $ 124 $ (1)
Weighted average outstanding shares of common stock (in shares) 109.1 113.2 109.3 115.2
Dilutive effect of employee stock options, restricted stock and other stock awards (in shares) 0.0 1.0 1.6 0.0
Common stock and common stock equivalents (in shares) 109.1 114.2 110.9 115.2
Net (loss) income per share:        
Basic (in dollars per share) $ (0.01) $ 0.09 $ 1.13 $ (0.01)
Diluted (in dollars per share) $ (0.01) $ 0.09 $ 1.12 $ (0.01)
Weighted average number of shares outstanding, diluted and anti-dilutive (in shares) 111.1     116.6
Antidilutive options to purchase that were not included in the computation of diluted earnings per share (in shares) 2.1 1.6 2.1 1.6