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Net Income Per Share - Computation of Basic and Diluted Net Income Per Share (Detail) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2022
Sep. 30, 2021
Numerator:                
Net income $ 6 $ 130 $ 143 $ 132 $ 146 $ 122 $ 279 $ 401
Denominator:                
Shares used in net income per common share – basic 61,000,000.0     55,500,000     57,400,000 55,400,000
Effect of dilutive securities 100,000     200,000     200,000 300,000
Shares used in net income per common share – diluted 61,100,000     55.7     57,600,000 55.7
Net income per common share:                
Basic $ 0.09     $ 2.39     $ 4.85 $ 7.24
Net income per common share:                
Diluted $ 0.09     $ 2.38     $ 4.84 $ 7.21