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Earnings (Loss) Per Share - Computation of Basic and Diluted Earnings (Loss) Per Share (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Numerator:
Net income (loss) attributable to NOW Inc	$ 40	$ 5	$ 96	$ (7)
Less: net income attributable to participating securities	(1)	0	(1)	0
Net income (loss) attributable to NOW Inc stockholders	$ 39	$ 5	$ 95	$ (7)
Denominator:
Weighted average basic common shares outstanding	110,863,381	110,558,831	110,747,087	110,351,625
Effect of dilutive securities	569,398	71,857	363,754	0
Weighted average diluted common shares outstanding	111,432,779	110,630,688	111,110,841	110,351,625
Basic	$ 0.35	$ 0.05	$ 0.85	$ (0.06)
Diluted	$ 0.35	$ 0.05	$ 0.85	$ (0.06)

X

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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