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Stock-based Compensation and Outstanding Awards - Additional Information (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
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Date |  |  | May 31, 2024 |
Stock-based compensation expense | $ 4 | $ 4 | $ 6 | $ 7
DNOW Inc. Long Term Incentive Plan [Member] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period |  |  | 10 years |
Restricted Stock Awards [Member] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Stock based awards, shares granted |  |  | 778,052 |
Weighted average grant date fair value, Granted |  |  | $ 13.12 |
Restricted Stock and Restricted Stock Units [Member] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Stock based awards, shares granted |  |  | 778,052 |
Weighted average grant date fair value, Granted |  |  | $ 13.12 |
Performance-base restricted stock [Member] | Minimum [Member] | Senior Management Employees [Member] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Stock based awards, shares granted |  |  | 0 |
Performance-base restricted stock [Member] | Maximum [Member] | Senior Management Employees [Member] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Stock based awards, shares granted |  |  | 553,424 |
TSR metric [Member] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Performance based restricted stock awards goals over performance period |  |  | 3 years |
EBITDA metric [Member] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Performance based restricted stock awards goals over performance period |  |  | 3 years |
Return on Capital Employed (ROCE) metric [Member] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Performance based restricted stock awards goals over performance period |  |  | 3 years |

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