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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, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Numerator:        
Net income attributable to DNOW Inc. $ 24 $ 34 $ 45 $ 65
Less: net income attributable to participating securities (1) (1) (1) (1)
Net income attributable to DNOW Inc. stockholders $ 23 $ 33 $ 44 $ 64
Denominator:        
Weighted average basic common shares outstanding 106,865,008 107,249,498 106,655,156 108,428,199
Effect of dilutive securities 757,796 878,013 830,097 1,044,006
Weighted average diluted common shares outstanding 107,622,804 108,127,511 107,485,253 109,472,205
Basic $ 0.21 $ 0.31 $ 0.41 $ 0.59
Diluted $ 0.21 $ 0.31 $ 0.41 $ 0.59