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Earnings (Loss) Per Share ("EPS") - Computation of Basic and Diluted EPS (Detail) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Numerator:      
Net income (loss) attributable to NOW Inc. $ 128 $ 5 $ (427)
Less: net income attributable to participating securities (2) 0 0
Net income (loss) attributable to NOW Inc stockholders $ 126 $ 5 $ (427)
Denominator:      
Weighted average basic common shares outstanding 110,676,078 110,403,853 109,406,079
Effect of dilutive securities 548,311 91,088 0
Weighted average diluted common shares outstanding 111,224,389 110,494,941 109,406,079
Basic $ 1.14 $ 0.05 $ (3.91)
Diluted $ 1.13 $ 0.05 $ (3.91)