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Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reconciliation Of Statutory Federal Tax Rate [Line Items]
Unrecognized tax benefit	$ 115us-gaap_UnrecognizedTaxBenefits	$ 127us-gaap_UnrecognizedTaxBenefits	$ 128us-gaap_UnrecognizedTaxBenefits	$ 131us-gaap_UnrecognizedTaxBenefits
Reduction in unrecognized tax benefit	15nov_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthoritiesAndFromLapseOfApplicableStatuteOfLimitations
Increase in unrecognized tax benefit	3us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromSettlementsWithTaxingAuthorities
Decrease of income tax expense in the current year	12nov_IncreaseDecreaseInIncomeTaxExpenseBenefit
Unrecognized tax benefits that would reduce income tax	0.5us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
Accrued income tax interest and penalties related to unrecognized tax benefit	8.5us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
Operating loss carry forward potential benefit	118us-gaap_DeferredTaxAssetsOperatingLossCarryforwards	51us-gaap_DeferredTaxAssetsOperatingLossCarryforwards	25us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Foreign tax credit	243us-gaap_TaxCreditCarryforwardAmount
Excess foreign tax credit, valuation allowance reversed	101us-gaap_TaxCreditCarryforwardValuationAllowance
Undistributed earnings of foreign subsidiaries	5,874us-gaap_UndistributedEarningsOfForeignSubsidiaries	6,045us-gaap_UndistributedEarningsOfForeignSubsidiaries
Realized [Member]
Reconciliation Of Statutory Federal Tax Rate [Line Items]
Unrecognized tax benefit	54us-gaap_UnrecognizedTaxBenefits / us-gaap_TaxCreditCarryforwardAxis = nov_RealizedMember
Carry forward expiration year 2018 [Member]
Reconciliation Of Statutory Federal Tax Rate [Line Items]
Net operating loss carry forward	73us-gaap_OperatingLossCarryforwards / us-gaap_TaxCreditCarryforwardAxis = nov_CarryForwardExpirationYearFiveMember
Carry forward expiration year 2020 [Member]
Reconciliation Of Statutory Federal Tax Rate [Line Items]
Net operating loss carry forward	28us-gaap_OperatingLossCarryforwards / us-gaap_TaxCreditCarryforwardAxis = nov_CarryForwardExpirationYearSixMember
Carry forward expiration year 2022 [Member]
Reconciliation Of Statutory Federal Tax Rate [Line Items]
Net operating loss carry forward	142us-gaap_OperatingLossCarryforwards / us-gaap_TaxCreditCarryforwardAxis = nov_CarryForwardExpirationYearEightMember
Domestic Country [Member]
Reconciliation Of Statutory Federal Tax Rate [Line Items]
Net operating loss carry forward	20us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember
Income tax interest and penalties related to unrecognized tax benefit	7us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember
Operating loss carry forward potential benefit	7us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember
Operating loss carry forward valuation allowance	7us-gaap_OperatingLossCarryforwardsValuationAllowance / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember
Domestic Country [Member] | Carry Forward Expiration Year 2025 [Member]
Reconciliation Of Statutory Federal Tax Rate [Line Items]
Net operating loss carry forward	4us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember / us-gaap_TaxCreditCarryforwardAxis = nov_CarryForwardExpirationYearElevenMember
Domestic Country [Member] | Carry Forward Expiration Year 2026 [Member]
Reconciliation Of Statutory Federal Tax Rate [Line Items]
Net operating loss carry forward	13us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember / us-gaap_TaxCreditCarryforwardAxis = nov_CarryForwardExpirationYearTwelveMember
Domestic Country [Member] | Carry Forward Expiration Year 2027 [Member]
Reconciliation Of Statutory Federal Tax Rate [Line Items]
Net operating loss carry forward	1us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember / us-gaap_TaxCreditCarryforwardAxis = nov_CarryForwardExpirationYearThirteenMember
Domestic Country [Member] | Carry Forward Expiration Year 2029 [Member]
Reconciliation Of Statutory Federal Tax Rate [Line Items]
Net operating loss carry forward	1us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember / us-gaap_TaxCreditCarryforwardAxis = nov_CarryForwardExpirationYearFifteenMember
Domestic Country [Member] | Carry Forward Expiration Year 2030 [Member]
Reconciliation Of Statutory Federal Tax Rate [Line Items]
Net operating loss carry forward	1us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember / us-gaap_TaxCreditCarryforwardAxis = nov_CarryForwardExpirationYearSixteenMember
Foreign Country [Member]
Reconciliation Of Statutory Federal Tax Rate [Line Items]
Net operating loss carry forward	381us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember
Income tax interest and penalties related to unrecognized tax benefit	98us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember
Operating loss carry forward potential benefit	41us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember
Operating loss carry forward valuation allowance	41us-gaap_OperatingLossCarryforwardsValuationAllowance / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember
Foreign Country [Member] | Carry Forward Expiration Year 2025 [Member]
Reconciliation Of Statutory Federal Tax Rate [Line Items]
Net operating loss carry forward	4us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_TaxCreditCarryforwardAxis = nov_CarryForwardExpirationYearElevenMember
Foreign Country [Member] | Carry forward expiration year 2014 [Member]
Reconciliation Of Statutory Federal Tax Rate [Line Items]
Net operating loss carry forward	5us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_TaxCreditCarryforwardAxis = nov_CarryForwardExpirationYearOneMember
Foreign Country [Member] | Carry forward expiration year 2015 [Member]
Reconciliation Of Statutory Federal Tax Rate [Line Items]
Net operating loss carry forward	4us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_TaxCreditCarryforwardAxis = nov_CarryForwardExpirationYearTwoMember
Foreign Country [Member] | Carry forward expiration year 2016 [Member]
Reconciliation Of Statutory Federal Tax Rate [Line Items]
Net operating loss carry forward	34us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_TaxCreditCarryforwardAxis = nov_CarryForwardExpirationYearThreeMember
Foreign Country [Member] | Carry forward expiration year 2017 [Member]
Reconciliation Of Statutory Federal Tax Rate [Line Items]
Net operating loss carry forward	16us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_TaxCreditCarryforwardAxis = nov_CarryForwardExpirationYearFourMember
Foreign Country [Member] | Carry forward expiration year 2018 [Member]
Reconciliation Of Statutory Federal Tax Rate [Line Items]
Net operating loss carry forward	4us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_TaxCreditCarryforwardAxis = nov_CarryForwardExpirationYearFiveMember
Foreign Country [Member] | Carry forward expiration year 2020 [Member]
Reconciliation Of Statutory Federal Tax Rate [Line Items]
Net operating loss carry forward	6us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_TaxCreditCarryforwardAxis = nov_CarryForwardExpirationYearSixMember
Foreign Country [Member] | Carry forward expiration year 2021 [Member]
Reconciliation Of Statutory Federal Tax Rate [Line Items]
Net operating loss carry forward	20us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_TaxCreditCarryforwardAxis = nov_CarryForwardExpirationYearSevenMember
Foreign Country [Member] | Carry forward expiration year 2022 [Member]
Reconciliation Of Statutory Federal Tax Rate [Line Items]
Net operating loss carry forward	10us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_TaxCreditCarryforwardAxis = nov_CarryForwardExpirationYearEightMember
Foreign Country [Member] | Carry forward expiration year 2023 [Member]
Reconciliation Of Statutory Federal Tax Rate [Line Items]
Net operating loss carry forward	9us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_TaxCreditCarryforwardAxis = nov_CarryForwardExpirationYearNineMember
Foreign Country [Member] | Carry Forward Expiration Year Ten [Member]
Reconciliation Of Statutory Federal Tax Rate [Line Items]
Net operating loss carry forward	41us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_TaxCreditCarryforwardAxis = nov_CarryForwardExpirationYearTenMember
Foreign Country [Member] | Operating Loss Carry Forward Indefinitely [Member]
Reconciliation Of Statutory Federal Tax Rate [Line Items]
Net operating loss carry forward	$ 228us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_TaxCreditCarryforwardAxis = nov_OperatingLossCarryforwardNoExpirationMember

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Unrecognized tax benefits decreases resulting from settlements with taxing authorities and from lapse of applicable statute of limitations.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

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