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Earnings per Share (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Earnings Per Share [Abstract]    
Net income attributable to common stockholders $ 53 $ 168
Weighted average outstanding shares of common stock (in shares) 108.7 110.3
Dilutive effect of employee stock options, restricted stock and other stock awards (in shares) 4.1 1.0
Common stock and common stock equivalents (in shares) 112.8 111.3
Net income per share:    
Basic (in dollars per share) $ 0.49 $ 1.52
Diluted (in dollars per share) $ 0.47 $ 1.51
Antidilutive options to purchase that were not included in the computation of diluted earnings per share (in shares) 1.2 2.2