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Stock-based Compensation and Outstanding Awards - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions |  | 12 Months Ended
--- | --- | ---
May 22, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Company common stock were authorized for grant |  | 16,000,000 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Date |  | May 31, 2024 |  |
Stock-based compensation expense |  | $ 13 | $ 15 | $ 11
Shares available for grant |  | 0 |  |
Tax effected benefit for share-based compensation arrangements |  | $ 2 | 2 | 2
Share-based compensation arrangement by share-based payment award, options, contractual term |  | 2 years 3 months 18 days |  |
Aggregate intrinsic value, Exercised or settled |  | $ 3 |  | 1
Exercise of stock options |  | $ 5 | 2 | $ 2
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 |  |
2024 Omnibus Incentive Plan [Member] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Shares available for grant | 1,973,000 |  |  |
Maximum [Member] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Aggregate intrinsic value, Exercised or settled |  |  | $ 1 |
Employee Stock Option |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Stock based awards, vested, number of years |  | 3 years |  |
Share-based compensation arrangement by share-based payment award, options, contractual term |  | 7 years |  |
Exercise of stock options |  | $ 6 |  |
Restricted Stock [Member] | Cliff Vests After Year One [Member] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Stock based awards, vested, number of years |  | 1 year |  |
Restricted Stock [Member] | Cliff Vests After Year Three [Member] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Stock based awards, vested, number of years |  | 3 years |  |
Restricted Stock and Restricted Stock Units [Member] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Unrecognized compensation costs |  | $ 14 |  |
Expected to be recognized over a weighted average period |  | 1 year 3 months 18 days |  |
Weighted average grant date fair value, Granted |  | $ 13.6 | $ 12.56 | $ 9.89
Fair value of shares vested |  | $ 5 | $ 3 | $ 2
Performance Shares [Member] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Weighted average grant date fair value, Granted |  | $ 14.17 |  |
Performance-base restricted stock [Member] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Stock based awards, vested, number of years |  | 3 years |  |
Unrecognized compensation costs |  | $ 5 |  |
Expected to be recognized over a weighted average period |  | 1 year 1 month 6 days |  |
Weighted average grant date fair value, Granted |  | $ 14.17 | $ 15.52 | $ 11.08
Performance-based awards granted, percentage, minimum threshold met |  | 0.00% |  |
Performance-based awards granted, percentage, maximum threshold met |  | 200.00% |  |
Vest-date fair value vested during period |  | $ 7 | $ 1 |
Performance-base restricted stock [Member] | Maximum [Member] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Vest-date fair value vested during period |  |  |  | $ 1
TSR metric [Member] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Performance based restricted stock awards granted in percent |  | 50.00% |  |
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 granted in percent |  | 25.00% |  |
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 granted in percent |  | 25.00% |  |
Performance based restricted stock awards goals over performance period |  | 3 years |  |

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