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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Gross number of share options (or share units) granted during the period.

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Stock-Based Compensation - Additional Information (Detail) $ / shares in Units, $ in Millions		3 Months Ended
	Feb. 06, 2024 $ / shares shares	Mar. 31, 2024 USD ($) Installment shares	Mar. 31, 2023 USD ($)
Restricted Stock and Restricted Stock Units [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Shares granted	2,571,356
Restricted stock granted fair value \| $ / shares	$ 17.52
Number of equal annual vesting installments \| Installment		3
Duration of performance-based restricted stock awards, vested		The restricted stock units vest in three equal annual installments commencing on the first anniversary of the grant date.
Performance-base restricted stock [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Description of performance goal		The 2024 PSAs can be earned based on performance against two established goals over a three-year period:
Performance-base restricted stock [Member] \| Senior Management Employees [Member] \| Minimum [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Shares granted	0
Performance-base restricted stock [Member] \| Senior Management Employees [Member] \| Maximum [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Shares granted	1,061,644
TSR [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Percentage of performance shares awarded		85.00%
NVA [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Percentage of performance shares awarded		15.00%
TSR Award [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Description of performance goal		85% with a TSR (total shareholder return) goal and 15% with an internal NVA (“NOV Value Added”, a return on capital metric) goal. TSR performance is determined by comparing the Company’s TSR with the TSR of the members of the Philadelphia Stock Exchange’s Oil Services Sector Index (OSX) for the three-year performance period. The TSR portion of the performance share awards is subject to a vesting cap equal to 100% of Target Level if the Company’s absolute TSR is negative, regardless of relative TSR results. Conversely, if the Company’s absolute TSR is greater than 15% annualized over the three-year performance period the payout amount shall not be less than 50% of Target Level, regardless of relative TSR results. The NVA goal is based on the Company’s improvement in NVA from the beginning of the performance period until the end of the performance period. NVA is calculated as an amount equal to the Company’s (a) gross cash earnings less (b) average gross operating assets times an amount equal to a required return on assets, with certain adjustments.
2018 Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Stock-based compensation expense \| $		$ 19	$ 15
2018 Plan [Member] \| Employee Stock Option
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Stock options granted	1,110,478
Weighted average grant-date fair value of options \| $ / shares	$ 7.9
Restricted stock granted fair value \| $ / shares	$ 17.52
NOV Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Authorized shares under stock based compensation		55,700,000
Remaining shares available for future grants under the Plan		7,600,000
Income tax benefit recognized \| $		$ 4	$ 0