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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 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Numerator:        
Net income attributable to DNOW Inc. $ 13 $ 35 $ 58 $ 100
Less: net income attributable to participating securities 0 (1) (1) (2)
Net income attributable to DNOW Inc. stockholders $ 13 $ 34 $ 57 $ 98
Denominator:        
Weighted average basic common shares outstanding 106,314,446 106,983,920 106,540,763 107,765,405
Effect of dilutive securities 693,608 1,134,399 784,601 1,074,137
Weighted average diluted common shares outstanding 107,008,054 108,118,319 107,325,364 108,839,542
Basic $ 0.12 $ 0.32 $ 0.53 $ 0.91
Diluted $ 0.12 $ 0.32 $ 0.53 $ 0.9