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Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Numerator:        
Net income attributable to NOW Inc. $ 34 $ 26 $ 65 $ 56
Less: net income attributable to participating securities (1) (1) (1) (1)
Net income attributable to NOW Inc. stockholders $ 33 $ 25 $ 64 $ 55
Denominator:        
Weighted average basic common shares outstanding 107,249,498 110,772,042 108,428,199 110,687,985
Effect of dilutive securities 878,013 302,291 1,044,006 260,932
Weighted average diluted common shares outstanding 108,127,511 111,074,333 109,472,205 110,948,917
Basic $ 0.31 $ 0.23 $ 0.59 $ 0.5
Diluted $ 0.31 $ 0.23 $ 0.59 $ 0.5