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Earnings per Share (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Earnings Per Share [Abstract]            
Net income (loss) $ 44 $ 53 $ (43) $ 168 $ 97 $ 125
Weighted average outstanding shares of common stock (in shares) 109.0   108.5   108.9 109.4
Dilutive effect of employee stock options, restricted stock and other stock awards (in shares) 3.7   0.0   3.8 1.2
Common stock and common stock equivalents (in shares) 112.7   108.5   112.7 110.6
Net income (loss) per share:            
Basic (in dollars per share) $ 0.40   $ (0.40)   $ 0.89 $ 1.14
Diluted (in dollars per share) $ 0.39   $ (0.40)   $ 0.86 $ 1.13
Weighted average number of shares outstanding, diluted and anti-dilutive (in shares)     109.7      
Antidilutive options to purchase that were not included in the computation of diluted earnings per share (in shares) 0.2   2.1   0.6 2.2