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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
Mar. 31, 2024
Mar. 31, 2023
Numerator:    
Net income attributable to DNOW Inc. $ 21 $ 31
Less: net income attributable to participating securities 0 0
Net income attributable to DNOW Inc. stockholders $ 21 $ 31
Denominator:    
Weighted average basic common shares outstanding 106,445,323 110,006,858
Effect of dilutive securities 902,398 1,209,998
Weighted average diluted common shares outstanding 107,347,721 111,216,856
Basic $ 0.2 $ 0.28
Diluted $ 0.19 $ 0.28