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Accumulated Other Comprehensive Loss - Additional Information (Detail) $ in Millions | 3 Months Ended
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Mar. 31, 2025 USD ($)
Statement of Comprehensive Income [Abstract] |
Changes in fair value of open derivatives | $ 5
Cumulative changes in the fair value of derivatives | $ 4

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- Definition Change in fair value of derivative. + References No definition available. + Details
Name: | nov_ChangeInFairValueOfDerivative
Namespace Prefix: | nov_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Other comprehensive income (loss), cumulative change in net gain (loss) from cash flow hedges, tax. + References No definition available. + Details
Name: | nov_OtherComprehensiveIncomeLossCumulativeChangeInNetGainLossFromCashFlowHedgesTax
Namespace Prefix: | nov_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration