XML 51 R38.htm IDEA: XBRL DOCUMENT
v3.22.1

Accumulated Other Comprehensive Loss - Additional Information (Detail) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2022 USD ($)
Statement Of Income And Comprehensive Income [Abstract] |
Changes in fair value of open derivatives | $ (2)
Cumulative changes in the fair value of derivatives | $ (6)

X
- 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

X
- 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

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