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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, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Numerator:        
Net income attributable to DNOW Inc. $ 25 $ 13 $ 72 $ 58
Less: net income attributable to participating securities (1) 0 (2) (1)
Net income attributable to DNOW Inc. stockholders $ 24 $ 13 $ 70 $ 57
Denominator:        
Weighted average basic common shares outstanding 105,011,966 106,314,446 105,478,443 106,540,763
Effect of dilutive securities 599,114 693,608 636,812 784,601
Weighted average diluted common shares outstanding 105,611,080 107,008,054 106,115,255 107,325,364
Basic $ 0.23 $ 0.12 $ 0.66 $ 0.53
Diluted $ 0.23 $ 0.12 $ 0.66 $ 0.53