NOV


Line plots across dimensions of each concept
Tables

Table of contents


us-gaap:StatementEquityComponents
us-gaap:SharesIssued

us-gaap:CommonStockSharesIssued

us-gaap:CommonStockSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareDiluted

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments, us-gaap:Subsegments, us-gaap:SubsegmentsConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementGeographical, us-gaap:StatementBusinessSegments, us-gaap:Subsegments
us-gaap:ConsolidationItems, us-gaap:StatementGeographical, us-gaap:Subsegments
us-gaap:ConsolidationItems, us-gaap:Subsegments, us-gaap:SubsegmentsConsolidationItems
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents
us-gaap:StatementBusinessSegments
us-gaap:StatementGeographical, us-gaap:Subsegments

us-gaap:CostOfRevenue

us-gaap:CostOfGoodsAndServicesSold
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:GrossProfit

us-gaap:SellingGeneralAndAdministrativeExpense

us-gaap:OperatingIncomeLoss
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments

us-gaap:InterestExpense

us-gaap:OtherNonoperatingIncomeExpense

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeTaxExpenseBenefit
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:IncomeTaxesPaidNet

us-gaap:ProfitLoss
us-gaap:StatementEquityComponents

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest

us-gaap:NetIncomeLoss
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest

us-gaap:Assets
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments

us-gaap:Liabilities

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:StockholdersEquity

us-gaap:AssetsCurrent

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:ReceivablesNetCurrent

us-gaap:InventoryNet

us-gaap:PrepaidExpenseAndOtherAssetsCurrent

us-gaap:PropertyPlantAndEquipmentGross
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:PropertyPlantAndEquipmentNet
us-gaap:StatementGeographical

us-gaap:Goodwill
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments, us-gaap:Subsegments
us-gaap:Subsegments

us-gaap:IntangibleAssetsNetExcludingGoodwill
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:IndefiniteLivedIntangibleAssetsByMajorClass
us-gaap:StatementBusinessSegments

us-gaap:OtherAssetsNoncurrent

us-gaap:LiabilitiesCurrent

us-gaap:AccountsPayableCurrent

us-gaap:OtherAccruedLiabilitiesCurrent

us-gaap:AccruedIncomeTaxesCurrent

us-gaap:LongTermDebtNoncurrent

us-gaap:DeferredTaxLiabilitiesNoncurrent

us-gaap:MinorityInterest

us-gaap:OtherLiabilitiesNoncurrent

us-gaap:StockholdersEquity

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetIncomeLoss
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:ProfitLoss
us-gaap:StatementEquityComponents

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet

us-gaap:IncreaseDecreaseInInventories

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:NetCashProvidedByUsedInFinancingActivities
us-gaap:DebtInstrument
us-gaap:DebtInstrumentInterestRateStatedPercentage

us-gaap:EffectiveIncomeTaxRateContinuingOperations

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
us-gaap:Range, us-gaap:TitleOfIndividual, us-gaap:AwardType

us-gaap:DeferredTaxLiabilities

us-gaap:DeferredTaxAssetsNet

us-gaap:UnrecognizedTaxBenefits

us-gaap:DeferredTaxAssetsValuationAllowance

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

nov:GoodwillAndIndefiniteLivedIntangibleAssetImpairment

nov:IntangibleAssetsAcquiredDuringPeriod
us-gaap:StatementBusinessSegments

nov:IntangibleAssetsTranslationAndPurchaseAccountingAdjustments
us-gaap:StatementBusinessSegments

nov:PercentageAsOfOperatingProfitToRevenue
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

nov:PropertyPlantAndEquipmentAndRightOfUseAssetsImpairmenCharge
us-gaap:StatementBusinessSegments

nov:ProvisionForInventoryLosses

nov:WithholdingTaxes
us-gaap:StatementEquityComponents

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
us-gaap:StatementEquityComponents

us-gaap:AllocatedShareBasedCompensationExpense
us-gaap:PlanName

us-gaap:AmortizationOfIntangibleAssets
us-gaap:StatementBusinessSegments

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:CommonStockDividendsPerShareCashPaid

us-gaap:ContractWithCustomerPerformanceObligationSatisfiedInPreviousPeriod
us-gaap:CreditFacility
us-gaap:DebtInstrumentBasisSpreadOnVariableRate1
us-gaap:VariableRate

us-gaap:DeferredIncomeTaxesAndTaxCredits

us-gaap:DepreciationAndAmortization

us-gaap:DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet

us-gaap:DividendsCommonStockCash
us-gaap:StatementEquityComponents

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense

us-gaap:FinanceLeasePrincipalPayments
us-gaap:DebtInstrument
us-gaap:GainsLossesOnExtinguishmentOfDebt

us-gaap:GoodwillAcquiredDuringPeriod
us-gaap:StatementBusinessSegments

us-gaap:GoodwillForeignCurrencyTranslationGainLoss
us-gaap:StatementBusinessSegments

us-gaap:GoodwillImpairmentLoss
us-gaap:StatementBusinessSegments

us-gaap:ImpairmentOfIntangibleAssetsExcludingGoodwill
us-gaap:StatementBusinessSegments

us-gaap:ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill

us-gaap:ImpairmentOfLongLivedAssetsHeldForUse

us-gaap:IncomeLossFromEquityMethodInvestments

us-gaap:IncreaseDecreaseInAccountsPayable

us-gaap:IncreaseDecreaseInAccountsReceivable

us-gaap:IncreaseDecreaseInAccruedIncomeTaxesPayable

us-gaap:IncreaseDecreaseInAccruedLiabilities

us-gaap:IncreaseDecreaseInContractWithCustomerAsset

us-gaap:IncreaseDecreaseInContractWithCustomerLiability

us-gaap:IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets

us-gaap:InterestPaidNet

us-gaap:InvestmentIncomeInterest

us-gaap:NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoptionQuantification
us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax
us-gaap:StatementEquityComponents
us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax

us-gaap:OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax

us-gaap:OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax

us-gaap:OtherComprehensiveIncomeLossNetOfTax
us-gaap:StatementEquityComponents

us-gaap:OtherNoncashIncomeExpense

us-gaap:PaymentsForProceedsFromOtherInvestingActivities

us-gaap:PaymentsOfDividendsCommonStock

us-gaap:PaymentsToAcquireBusinessesNetOfCashAcquired

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities
us-gaap:StatementEquityComponents
us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax

us-gaap:RestructuringCharges
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:RestructuringCostAndReserve
us-gaap:StatementEquityComponents
us-gaap:StockIssuedDuringPeriodSharesNewIssues

us-gaap:StockIssuedDuringPeriodValueNewIssues
us-gaap:StatementEquityComponents

nov:AccruedPurchaseOrders

nov:DeferredTaxAssetsAllowancesAndOperatingLiabilities

nov:DeferredTaxLiabilitiesTaxAccruedLiabilities

nov:DeferredTaxLiabilitiesTaxOverBookDepreciation

nov:LeaseLiabilitiesCurrent

nov:LeaseLiabilitiesNonCurrent

nov:OperatingLossCarryforwardTaxEffected
us-gaap:IncomeTaxAuthority

nov:OperatingLossCarryforwardsNetOfValuationAllowanceTaxEffected
us-gaap:IncomeTaxAuthority

nov:PercentageOfInventoryReserve
us-gaap:AwardType
nov:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisableNumber
us-gaap:AwardType
nov:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisableWeightedAverageExercisePrice

us-gaap:AccrualForTaxesOtherThanIncomeTaxesCurrent

us-gaap:AccruedInsuranceCurrent

us-gaap:AccruedLiabilitiesCurrent

us-gaap:AccruedSalesCommissionCurrent

us-gaap:AdditionalPaidInCapitalCommonStock

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent

us-gaap:ContractWithCustomerAssetNet

us-gaap:ContractWithCustomerAssetNetCurrent

us-gaap:ContractWithCustomerLiability

us-gaap:ContractWithCustomerLiabilityCurrent
us-gaap:DebtInstrument
us-gaap:DebtInstrumentFaceAmount

us-gaap:DeferredIncomeTaxLiabilities

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards

us-gaap:DeferredTaxAssetsOther

us-gaap:DeferredTaxAssetsTaxCreditCarryforwards

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost

us-gaap:DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets

us-gaap:DeferredTaxLiabilitiesOther

us-gaap:DeferredTaxLiabilitiesTaxDeferredIncome
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAccumulatedBenefitObligation
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanBenefitObligation

us-gaap:DefinedBenefitPlanFairValueOfPlanAssets
us-gaap:DefinedBenefitPlanByPlanAssetCategories
us-gaap:DefinedBenefitPlanByPlanAssetCategories, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:RetirementPlanType
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanFundedStatusOfPlan

us-gaap:DerivativeFairValueOfDerivativeAsset
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:HedgingDesignation

us-gaap:DerivativeFairValueOfDerivativeLiability
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:DerivativeInstrumentRisk, us-gaap:FinancialInstrument, us-gaap:HedgingDesignation
us-gaap:HedgingDesignation

us-gaap:DerivativeInstrumentsAndHedgesLiabilities

us-gaap:EmployeeRelatedLiabilitiesCurrent

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
us-gaap:AwardType

us-gaap:EquityMethodInvestments

us-gaap:FinanceLeaseLiability

us-gaap:FinanceLeaseLiabilityCurrent

us-gaap:FinanceLeaseLiabilityNoncurrent

us-gaap:FinanceLeaseRightOfUseAsset

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:FinancialInstrument
us-gaap:ForeignCurrencyCashFlowHedgeDerivativeAtFairValueNet

us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill

us-gaap:IntangibleAssetsGrossExcludingGoodwill
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:IndefiniteLivedIntangibleAssetsByMajorClass

us-gaap:InterestPayableCurrent

us-gaap:InventoryAdjustments

us-gaap:InventoryFinishedGoodsNetOfReserves

us-gaap:InventoryGross

us-gaap:InventoryRawMaterialsAndSuppliesNetOfReserves

us-gaap:InventoryValuationReserves

us-gaap:InventoryWorkInProcessNetOfReserves
us-gaap:CreditFacility
us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:LongtermDebtType
us-gaap:LongTermDebtFairValue

us-gaap:OperatingLeaseLiability

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:OperatingLossCarryforwards
us-gaap:IncomeTaxAuthority
us-gaap:IncomeTaxAuthority, us-gaap:TaxCreditCarryforward
us-gaap:TaxCreditCarryforward

us-gaap:OperatingLossCarryforwardsValuationAllowance
us-gaap:IncomeTaxAuthority

us-gaap:OtherLongTermDebt

us-gaap:RevenueRemainingPerformanceObligation

us-gaap:SeniorNotes
us-gaap:DebtInstrument
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
us-gaap:ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRange

us-gaap:ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
us-gaap:ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRange

us-gaap:SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
us-gaap:ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRange

us-gaap:SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
us-gaap:ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRange

us-gaap:StandardProductWarrantyAccrualCurrent

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
us-gaap:StatementEquityComponents

us-gaap:UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
us-gaap:ValuationAllowancesAndReservesType
us-gaap:ValuationAllowancesAndReservesBalance

Tables

  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
 us-gaap:SharesIssued us-gaap:StatementEquityComponents us-gaap:CommonStock█▁388386NANA386383NANANA380NANANANA379NANANA376NANANA419NANANANA428NANANA427NANANA424NANANA421NANANA418NANANA
us-gaap:CommonStockSharesIssued ▃▂▂▂▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁▂▄▆████████▇▇▇▇▇▇▇▇▇▇▇▆▆388385385385385383383382381380380380380380378377377377375375386395418430429429428428427427427426426426426423423423422421419419418418NANANA
us-gaap:CommonStockSharesOutstanding ▃▂▂▂▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁▂▄▆████████▇▇▇▇▇▇▇▇▇▇▇▆▆388385385385385383383382381380380380380380378377377377375375386395418430429429428428427427427426426426426423423423422421419419418418NANANA
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding 383NA382382380NA383381377NA377377377376NA376375375NA381388409NA431430430429NA428428428NA427427426NA425425423NA419419419NA418418418
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic 383NA382382380NA379378377NA377377377376NA376375375NA380387407NA429428428428NA426426426NA425425423NA422422420NA417417417NA416416416
us-gaap:EarningsPerShareBasic ▅▇▇▁▇▇▇▇▇▇▇▇▇▇▆▆▇▇▅▇███████████████████████████-5.34-1.01-0.64-14.11-0.20.030.00.06-0.18-0.04-0.07-0.07-0.2-0.32-1.9-3.62-0.58-0.32-4.060.410.750.761.391.631.451.451.381.541.491.251.181.571.441.421.431.361.261.140.971.050.970.961.010.950.930.531.13
us-gaap:EarningsPerShareDiluted ▅▇▇▁▇▇▇▇▇▇▇▇▇▇▆▆▇▇▅▇███████████████████████████-5.34-1.01-0.64-14.11-0.20.030.00.06-0.18-0.04-0.07-0.07-0.2-0.32-1.9-3.62-0.58-0.32-4.060.410.740.761.391.621.441.441.371.531.491.241.171.561.431.421.421.351.251.130.961.050.960.961.010.940.920.531.13
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax ▁▂▂▂▁▂▂▂▁▁▁▁▁▁▁▁▁▂▃▄▄▆▇▇▇▇▇█▇▇▇▇▇▆▅▅▄▄▃▃▃▃▃▃▃▃▄18832281212621321940239821542106179519691835183517591741169216461724218927223306390948205709558752555255577761725789560153075685531947344303425937403513314631723011294130323134308730103481
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ConsolidationItems us-gaap:OperatingSegments557NANANA603NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,nov:CompletionAndProductionSolutions▂▃▃▂▁▃▃▃▂▂▂▂▂▂▂▁▁▁▃▃▄▅█▇▆▆▅▆▆▆67579972866358178873573867069068268265264860254353855874679887394813251191112711271002115510951057NANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,nov:RigTechnologies▁▇▄▄▂█▃▄557759649671603804637651NANANANA546NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,nov:WellboreTechnologies▂▃▃▃▃▄▃▃▂▂▂▂▂▁▁▁▁▂▃▃▄▆██▇▇▆▇▇▆691764793850807884847793711715693693614555531526511631757834956117115291469144614461278137113951222NANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ConsolidationItems,us-gaap:StatementGeographical,us-gaap:StatementBusinessSegments,us-gaap:Subsegments us-gaap:OperatingSegments,nov:International,nov:CompletionAndProductionSolutions,nov:Continental▆█▅▃▁▆▃▄437510420364296439372374NANANANA376NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ConsolidationItems,us-gaap:StatementGeographical,us-gaap:StatementBusinessSegments,us-gaap:Subsegments us-gaap:OperatingSegments,nov:International,nov:WellboreTechnologies,nov:Continental▁█▅▇▃▇▆▂313380355375331375362326NANANANA249NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ConsolidationItems,us-gaap:StatementGeographical,us-gaap:StatementBusinessSegments,us-gaap:Subsegments us-gaap:OperatingSegments,nov:LandDestination,nov:CompletionAndProductionSolutions,nov:LandAndOffshore▂▅▅▄▁▇█▇416468479456405509521509NANANANA410NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ConsolidationItems,us-gaap:StatementGeographical,us-gaap:StatementBusinessSegments,us-gaap:Subsegments us-gaap:OperatingSegments,nov:LandDestination,nov:WellboreTechnologies,nov:LandAndOffshore▁▂▄▆▆█▇▅529571616679665733707660NANANANA490NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ConsolidationItems,us-gaap:StatementGeographical,us-gaap:StatementBusinessSegments,us-gaap:Subsegments us-gaap:OperatingSegments,nov:OffshoreDestination,nov:CompletionAndProductionSolutions,nov:LandAndOffshore▅█▄▂▁▅▃▃246318236190160255194207NANANANA231NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ConsolidationItems,us-gaap:StatementGeographical,us-gaap:StatementBusinessSegments,us-gaap:Subsegments us-gaap:OperatingSegments,srt:NorthAmerica,nov:CompletionAndProductionSolutions,nov:Continental▁▄▅▄▄▇██225276295282269325343342NANANANA265NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ConsolidationItems,us-gaap:StatementGeographical,us-gaap:StatementBusinessSegments,us-gaap:Subsegments us-gaap:OperatingSegments,srt:NorthAmerica,nov:WellboreTechnologies,nov:Continental▁▁▄▇▇█▇▆361367422461460484469449NANANANA352NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ConsolidationItems,us-gaap:StatementGeographical,us-gaap:Subsegments us-gaap:OperatingSegments,nov:International,nov:Continental470NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ConsolidationItems,us-gaap:StatementGeographical,us-gaap:Subsegments us-gaap:OperatingSegments,nov:OffshoreDestination,nov:LandAndOffshore396NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:StatementGeographical,us-gaap:Subsegments nov:International,nov:Continental▄█▅▅▃▇▄▄▁▃▂▂▂▃1220149012961262107013931153117295311261037103710021093NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:StatementGeographical,us-gaap:Subsegments nov:LandDestination,nov:LandAndOffshore▂▅▄▅▅█▇▆▄▅▄▄▂▁10961260124613061285151014341377120112711195119510731000NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:StatementGeographical,us-gaap:Subsegments nov:OffshoreDestination,nov:LandAndOffshore▄█▆▅▂▆▃▃▁▃▂▂▃▃7871021880826655888720729594698640640686741NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:StatementGeographical,us-gaap:Subsegments srt:NorthAmerica,nov:Continental▁▄▄▅▅██▇▅▅▄▄▃66379183087087010051001934842843798798757NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:CostOfRevenue ▁▂▂▂▁▂▂▂▁▂▁▁▁▁▂▁▁▂▃▃▄▆▇▇▆▆▇█▇▇▇▇▆▅▄▄▃▃▂▂▂▂▂▂▃▂▃16591905197520701684198917611751150818021550155015281532215115671689194523342634305436434168405938003800438146754327433540434291394834283036298425762430217121752066201320702155219621352442
us-gaap:CostOfGoodsAndServicesSold ▁▂▂▂▁▂▂▂▁▂▁▁▁▁▂▁▁▂▃▃▄▆▇▇▆▆▇█▇▇▇▇▆▅▄▄▃▃▂▂▂▂▂▂▃▂▃16591905197520701684198917611751150818021550155015281532215115671689194523342634305436434168405938003800438146754327433540434291394834283036298425762430217121752066201320702155219621352442
us-gaap:GrossProfit ▃▄▃▃▄▄▄▄▄▃▄▄▃▃▁▃▃▃▄▅▆▇███████▇▇█▇▇▇▇▇▆▆▆▆▆▆▆▆▆▆22437615162256409393355287167285285231209-4597935244359672855117715361528145514551396149714621266126413951371130612671275116410839759979459289629798918751039
us-gaap:SellingGeneralAndAdministrativeExpense ▁▁▁▄▂▂▂▂▁▁▁▁▁▂▂▁▂▄▃▃▄█▆▇▇▇▆▇▆▆▆▆▅▄▃▄▃▃▃▃▃▂▂▃▁▂▂283289293417304322320303288278292292293306307293305433386383417607524540542542535540516497513491473427390427392375366373349338325390279334319
us-gaap:OperatingIncomeLoss ▅▇▇▁▇▇▇▇▇▇▇▇▇▇▆▆▇▇▅▇▇████████████████████████▇█-1950-349-154-5728-48877352-1-111-7-7-62-97-766-1186-270-189-1632234438570913988913913861957946769751903898879877848772708609624596590637608601386720
 us-gaap:OperatingIncomeLoss us-gaap:StatementBusinessSegments us-gaap:IntersegmentElimination▄▅▆▃▆▁▄▂█-72-66-62-79-63-93-71-88-47NANANANANANANANANANANANANANANANANANANANANA-117-127-125-111-101-89-86-80NANANANANANANANANA
us-gaap:InterestExpense ▅▆▆▆▆▅▆▆▆▆▇▇▇▆▆▆█▆▇▆▇▇▇▇▇▇▇▇▇█▇▅▂▁▁▁▁▁▃▂▂▃▃▃▃▃▃22252525252224232425262626252525302527242626262627272627263028211198989141212131313141313
us-gaap:OtherNonoperatingIncomeExpense ▇▃▆▇▆▅▆▇▃▆▇▇▇▆▆▅▅▆▆▆▅▃▁█▆▆-3-54-10-8-18-29-20-3-47-14-6-6-2-11-16-30-34-21-17-20-30-56-789-21-21NA-17-1613-21-28-22-5-16-130-7-19-7-23-3-16-23-13-38-36
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest ▅▇█▁████████-2205-431-189-5757-85413330-63-128-40-40NANANANANANANANANA502830984893893787887861712NANANANANANANANANANANANANANANANANA
us-gaap:IncomeTaxExpenseBenefit ▃▄▆▁▅▅▅▅▅▄▅▅▅▅▄▆▄▄▃▅▆▇▇███████▇▇█████▇▇▇▇▇▇▇▇▆▇-156-4660-373-10262953-130-3-3-14-9-88120-121-118-15236105189233283284284260272283239224203265285269270252226189186169186197184192131228
 us-gaap:IncomeTaxExpenseBenefit us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome▄▄▄▄1111NA-1102011-24NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:IncomeTaxExpenseBenefit us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome,us-gaap:StatementEquityComponents us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome,us-gaap:AccumulatedGainLossNetCashFlowHedgeParent▄▄▄▄1111NA-11NANANANANA-2NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:IncomeTaxesPaidNet ▂▂▂▂▂▂▂▂▂▁▂▂▂▂▂▂▃▁▂▂▆▂▄▃▆▆▄▃▃▆▃▄▄█▃▃▂▅▄▃▂▃▂▄▃▄▂1463114129311842-8033334156853152-322210056496283211572572314213218497171252299797224140934462662078216110132619433178
us-gaap:ProfitLoss ▅▇▇▁▇▇▇▇▇▇▇▇▇▇▆▆▇▇▅▇█████████████████████████▇█-2049-385-249-5384-7515425-66-15-27-27-74-120-717-1364-217-118-1522156286313597701620620589661636531500668609602604573528480404437404399419391387222473
 us-gaap:ProfitLoss us-gaap:StatementEquityComponents us-gaap:NoncontrollingInterest-2NA-552NA312NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:ComprehensiveIncomeNetOfTax ▄▇▇▁▇▇▇▇▇▇▇▇▇▇▆▆▇▇▅▇█▇▇▇█████▇▇▂████▇████▇▇▇██-2279-284-376-5368-53-97-29-213-19-1512312324-27-883-1320-234126-1600-202485-171125292709709552654838388337-4546760431734514344514508422580284382392477414NA
us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest ▅▇▇▁▇▇▇▇▇▇██▇▇▆▆▇█▆▇█▇-2281-284-381-5363-51-94-26-212-17-1612212225-25-886-1322-234127-1598-202485-171NANANANANANANANANA-1787757428732-1472340513505419580282379389479416NA
us-gaap:NetIncomeLoss ▅▇▇▁▇▇▇▇▇▇▇▇▇▇▆▆▇▇▅▇█████████████████████████▇█-2047-385-244-5389-7712124-68-14-26-26-75-122-714-1362-217-119-1523155289310595699619619589658636531502668612605606574532481407440404401422394385220470
 us-gaap:NetIncomeLoss us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome▆▆▅▅▄▃█▃▂▄▄▄▇▁45321-18-1-31117-5NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetIncomeLoss us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome,us-gaap:StatementEquityComponents us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome,us-gaap:AccumulatedGainLossNetCashFlowHedgeParent▆█▅▄▃▂▄▁4632102-1NANANANA7NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:NetIncomeLossAttributableToNoncontrollingInterest ▃▄▁█▆▇▇▅▆▄▄▄▅▆▂▃▄▅▅▅▂▇▆▆▅▅-20-5523312-1-1-112-3-20111-332211NA100-20-3-3-2-1-4-1-3-30-2-3-3223
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:Assets ▁▂▂▂▄▄▄▄▄▄▄▄▄▄▄▄▅▅▆▆▇▇▇██████▇▇▇▆▆▅▅▅▅▅▄▄▄▄▄1069013149140051434920002197961989319758200102020620934209342088720904211402219423784247542672529628312253242433562342703382733827354803481234673335933355631484286622783326287255152454423756231562305022231216482146621532NANANA
us-gaap:Liabilities ▁▁▂▂▂▂▂▂▂▂▂▂▂▃▃▃▃▄▅▆▇██▇▇▇▇▇█▇█▆▄▄▃▃▃▂▂▃▂▂▃▃5136530358765862616259075917579058596046678367836865691971377306759883211026511422122201330212790126511240912409126881248212948126421287711128897989027767778773056851675571886827681168867304NANANA
us-gaap:LiabilitiesAndStockholdersEquity ▁▂▂▂▄▄▄▄▄▄▄▄▄▄▄▄▅▅▆▆▇▇▇██████▇▇▇▆▆▅▅▅▅▅▄▄▄▄▄1069013149140051434920002197961989319758200102020620934209342088720904211402219423784247542672529628312253242433562342703382733827354803481234673335933355631484286622783326287255152454423756231562305022231216482146621532NANANA
us-gaap:StockholdersEquity ▁▂▂▂▄▄▄▄▄▅▄▄▄▄▄▅▅▅▅▆▆▇▇█▇▇███▇▇▇▇▆▆▆▆▆▅▅▅▅▅▅548677788057841113765138191390613900140821409414084140841395313921139401481816118163551638318126189271903720692215232133221332226972223021627208592054920239195741882018416176191713416790162891574815286147281446714113NANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:AssetsCurrent ▁▁▁▂▂▂▂▂▂▂▂▂▂▂▂▃▃▄▅▅▆▇▇█▇▇██▇▇▇▇▆▅▅▅▅▄▄▄▄▃▃▃59026113651567666938727972217008718672177825782577417744787687119204100481180112933141671529916162166701600316003172111642316255152211499415678136671301412836121101203811226107391053510326982695459598NANANA
us-gaap:CashAndCashEquivalentsAtCarryingValue ▁▁▁▁▁▂▁▁▁▂▂▂▂▂▂▂▂▃▃▃▄▅▇███▇▆▅▄▄▆▂▃▆▇▇▆▆▆▆▅▅▅▆▄▄11151171131311211270142712931137123614371722172215301479140815101661175920801846254430243536409138853885368834362741232724413319170219173390353538703440306033333070268826082622319222862232
us-gaap:ReceivablesNetCurrent ▁▁▁▁▁▂▁▁▂▁▂▂▂▁▂▁▁▂▃▄▄▅▆▆▆▆█▇▇▆▆▆▅▅▄▄▄▃▃▂▂▂▂▂18791855179919731793210120051967210220152060206020861978208318082044221229263325347640244416448244274427531048964801442442794320403338603330329131092849275724252408238721112187NANANA
us-gaap:InventoryNet ▁▁▂▂▃▃▃▃▃▃▃▃▃▃▃▅▅▅▆▆▇▇▇▇▆▆▇▇█████▇▅▄▄▄▄▃▄▃▃▃20322197253728583131298631773158314630033219321932073254332541614287453446785172539453785281546451985198565956036078608361355891598955014528403039073756357033883562344334233490NANANA
us-gaap:PrepaidExpenseAndOtherAssetsCurrent ▂▂▂▁▁▁▂▂▂▂▂▂▃▃▄▅▄▅▅▆▆▆▇▇▆▆█▆▇▆▅▆▆▅▄▃▃▃237247251229205200263301287267306306319380395467422503491530562569604619595595709576625579474574592499426325339381NA258NANANANANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:PropertyPlantAndEquipmentGross NA5337NANANA5484NANANA5561NANANANA5448NANANA5276NANANA5405NANANANA5212NANANA4523NANANA3660NANANA2903NANANA2701NANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType nov:OperatingEquipmentNA2946NANANA3140NANANA3169NANANANA3102NANANA3055NANANA3060NANANANA2960NANANA2463NANANA1955NANANA1539NANANA1429NANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType nov:RentalEquipmentNA851NANANA597NANANA581NANANANA557NANANA639NANANA817NANANANA758NANANA712NANANA636NANANA628NANANA594NANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType us-gaap:BuildingImprovementsNA1309NANANA1271NANANA1340NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType us-gaap:LandNA231NANANA227NANANA252NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment NA2983NANANA2687NANANA2559NANANANA2298NANANA2152NANANA2043NANANANA1804NANANA1578NANANA-1215NANANA-1063NANANA-865NANANA
us-gaap:PropertyPlantAndEquipmentNet ▂▃▃▃▄▅▅▆▆▆▆▆▆▇▇▇▇▇▇▇▇▇███████▇▇▆▅▅▄▄▂▂▁▁▁▁▁▁20032354236123562605279728132859292630023031303130523108315032613277330331243122325032163362337734403440343734083333321032152945281827002531244519671921186118401808179218101836NANANA
us-gaap:Goodwill ▁▂▃▃▅▅▅▅▅▅▅▅▅▅▅▅▆▆▆▇▇▇█████████▆▆▆▅▅▅▅▅▅▅▅▅▅15152807323632066292626463396273621762276165616561296065606760156986700369808465850785098539861486408640887590499036899790057172694069176206615159425949590857905525553255445489NANANA
 us-gaap:Goodwill us-gaap:StatementBusinessSegments nov:CompletionAndProductionSolutions▁███473105410781041NA2041NANANA2122NANANANA20582006NANA1997NANANA2069NANANANA2106NANANA1314NANANANANANANANANANANANANANANA
 us-gaap:Goodwill us-gaap:StatementBusinessSegments nov:RigTechnologies▁▆██71291010011005NA1212NANANA1149NANANANA1135NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Goodwill us-gaap:StatementBusinessSegments nov:WellboreTechnologies▁▅██33084311571160NA3011NANANA2956NANANANA28742871NANA2874NANANA4357NANANANA4425NANANA3769NANANANANANANANANANANANANANANA
 us-gaap:Goodwill us-gaap:Subsegments nov:FiberGlassSystems346NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Goodwill us-gaap:Subsegments nov:RigEquipment661NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Goodwill us-gaap:Subsegments nov:WellSite174NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:IntangibleAssetsNetExcludingGoodwill ▁▇▇█534852866900NA3020NANANA3301NANANANA3530NANANA3849NANANA4444NANANANA5055NANANA4743NANANA4073NANANA4103NANANA4052NANANA
 us-gaap:IntangibleAssetsNetExcludingGoodwill us-gaap:StatementBusinessSegments nov:RigTechnologies▁▃▅█242251256268NA280NANANA258NANANANA275NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:IntangibleAssetsNetExcludingGoodwill us-gaap:StatementBusinessSegments nov:WellboreTechnologies▁▆██242326346349NA1735NANANA1883NANANANA2064NANANA2254NANANA2666NANANANA2999NANANA2942NANANANANANANANANANANANANANANA
us-gaap:OtherAssetsNoncurrent ▂▂▂▅▅▅▅▅▆▆▆▆▆▅▅▅▆▅▆▇███▅▄▄▅▅▅▄▆▆▅▃▄▃▁▂▂▂▂▁▂▃6967631291261241311261411371561561511311241351471321561701821911901251131131231151241081381401168797783757625561435972NANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:LiabilitiesCurrent ▁▁▁▁▁▁▁▁▁▁▂▂▂▂▂▂▂▃▄▅▆▇██▇▇█▇▇▆▆▆▆▇▅▅▅▄▄▄▃▃▃▄21632247227622212103234122762194213223542842284228512852304726152947343542495193567266677374720169156915709866786317561955465649568164815445541647444250413245363872393737444174NANANA
us-gaap:AccountsPayableCurrent ▃▃▃▃▃▃▃▃▂▂▁▁▁▁▁▁▁▂▃▃▄▅▇▇▇▇█▇▇▇▇▇█▇▅▅▄▃▃▃▂▂▂▂6627157166956797226756165285104474474483884143964344676237318479881189125911781178139112751312123212831200136512651009901802745656628585598538584NANANA
us-gaap:OtherAccruedLiabilitiesCurrent ▁▂▄▄▂▃▂▂▂▃▄▄▄▃▄▃▃▃▃▃▄▄▄▅▅▅▆▅███▇▇▆▆▆▃▃▂▄▂▂214236347335250282258253244309318318318288348286304291294298329320324351385385396357466465484433444419395419307282267328269244NA200NANANA
us-gaap:AccruedIncomeTaxesCurrent ▅█▁28429NA2166NA11358157577183119357419926411224432431267260260484556260248406355194207649709399178284468351233124226NANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:LongTermDebtNoncurrent ▄▄▅▅▅▅▅▅▅▅▅▅▅▅▅▆▆▆▇▇██▆▆▆▆▆▆▇██▆▃▁▁▁▂▂▂▂▂▂▂▂200219892484248324832704270627072707270627072707270827072708321032683372392839814154409430142995314831483149314937494120434931481175159159159510511512514516519724876NANANA
us-gaap:DeferredTaxLiabilitiesNoncurrent ▁▁▁▁▂▂▃▃▃▃▃▃▄▄▄▄▄▄▆▆▆▇▆▇▆▆▇▇███▆▆▆▆▆▆▆▆▆▇▇▇▇691401741775655646726666856779259259991043106411551103123918051826197620141972208820022002208822922443245825431997180219351847185217761815183218852197209121662091NANANA
us-gaap:MinorityInterest ▂▂▂▂▂▂▂▂▂▁▁▁▂▁▁▂▂▃▂▃▃▃▃▄▃▃▄▅▅▄█▇▆▆▅▆▅▆▆▆▇▆▆▆6868727675707068696667676964637068787780788580968686951009892130117109111104109105115112114118109113115NANANA
us-gaap:OtherLiabilitiesNoncurrent ▃▃▃▃▃▄▃▂▄▄▄▄▄▄▄▄▃▃▃▆▆█▆▅▄▄▅▅▆▆▆▄▄▄▄▅▃▃▃▃▃▃▃▁256253269285283298263223335309309309307317318326280275283422418527430367344344353363439445439334321327316360275275279253242264252163NANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:StockholdersEquity ▁▂▂▂▄▄▄▄▄▅▄▄▄▄▄▅▅▅▅▆▆▇▇█▇▇███▇▇▇▇▆▆▆▆▆▅▅▅▅▅▅548677788057841113765138191390613900140821409414084140841395313921139401481816118163551638318126189271903720692215232133221332226972223021627208592054920239195741882018416176191713416790162891574815286147281446714113NANANA
us-gaap:RetainedEarningsAccumulatedDeficit ▁▂▂▂▅▅▅▅▅▅▅▅▅▅▅▅▆▆▆█████▇▇███▇▇▇▇▆▆▆▆▅▅▅▅▅▄▄-1381690109413586766686268696888688369666999699970447138728580189399963599271339813417133061318112782122811228113801133231277612251118311138510773102129658910385808095766173006906654461855805NANANA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax ▁▂▁▂▂▂▂▂▃▃▃▃▂▂▂▂▂▂▁▂▃▂▄▆▇▇▇▇▇▆▇█▇▇█▇▇████▇▇▇-1655-1423-1524-1392-1413-1437-1328-1298-1061-1110-1109-1109-1258-1356-1452-1283-1325-1308-1553-1477-1119-1318-834-3624848-41-41-201-5810779-69104-233722519291109-675090NANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities ▂▄▃▂▂▃▃▃▁▃▃▃▃▂▃▂▃▄▄▄▃▂▅▄▅▅▄█▆▃▄▅▃▁▂▄▅▆▂▅▄▃▂▂▅▄▅39473352-73-38221190239-1293212322321681111535812862161441019411473651987187148815181009364506800137-253-64622634912-2580745318795126684500785
us-gaap:NetCashProvidedByUsedInInvestingActivities ▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▆▆▇▇▇▇▁▆▆▂▇▅▇▇▇▆▇▇▇▇█▆▇-53-47-112-49-107-65-32-299-61-61-36-36-106-42-211-83-91-103-136-106-123-149-307-143-528-528-126-152-148-129-2535-765-413-2090-160-882-152-301-123-573-62-43-65-233205-445-79
us-gaap:NetCashProvidedByUsedInFinancingActivities ▄▂▄▄▄▄▄▄▄▂▄▄▄▄▄▃▃▁▃▁▂▂▁▃▃▃▃▂▂▃▇█▄▆▄▃▄▃▃▄▄▄▄▂▄▄▄-43-574-34-19-20-188-2-18-543-21-21-18-13-25-126-129-861-224-942-561-436-950-130-158-158-105-668-465-334116215785089758-66-20-234-14421-41-46-36-4668-341
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities ▂▄▃▂▂▃▃▃▁▃▃▃▃▂▃▂▃▄▄▄▃▂▅▄▅▅▄█▆▃▄▅▃▁▂▄▅▆▂▅▄▃▂▂▅▄▅39473352-73-38221190239-1293212322321681111535812862161441019411473651987187148815181009364506800137-253-64622634912-2580745318795126684500785
us-gaap:NetIncomeLoss ▅▇▇▁▇▇▇▇▇▇▇▇▇▇▆▆▇▇▅▇█████████████████████████▇█-2047-385-244-5389-7712124-68-14-26-26-75-122-714-1362-217-119-1523155289310595699619619589658636531502668612605606574532481407440404401422394385220470
 us-gaap:NetIncomeLoss us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome▆▆▅▅▄▃█▃▂▄▄▄▇▁45321-18-1-31117-5NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetIncomeLoss us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome,us-gaap:StatementEquityComponents us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome,us-gaap:AccumulatedGainLossNetCashFlowHedgeParent▆█▅▄▃▂▄▁4632102-1NANANANA7NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:ProfitLoss ▅▇▇▁▇▇▇▇▇▇▇▇▇▇▆▆▇▇▅▇█████████████████████████▇█-2049-385-249-5384-7515425-66-15-27-27-74-120-717-1364-217-118-1522156286313597701620620589661636531500668609602604573528480404437404399419391387222473
 us-gaap:ProfitLoss us-gaap:StatementEquityComponents us-gaap:NoncontrollingInterest-2NA-552NA312NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet ▆▅▆▆▅▆▆▇▅▄▆▆▆▆▆▅▆▅▁█▇▇▅▄▄▄▆▆▄▅▇▄▆▅▇▃▅▅▇▇▄▆▅█▂▆▇105-731329-122433176-141-167414139-841-1154-127-669291229216-70-283-241-241115121-287-147246-233-1-40272-374-147-96231202-21832-104358-5353182
us-gaap:IncreaseDecreaseInInventories ▄▂▄▄▅▃▄▄▅▃▄▄▄▄▂▃▃▃▁▃▅▅▃▆▇▇▅▁▄▄▄▃▇▆▇▄▅▅▅▃▅▃▅█▄▄▄-47-273-2441152-186434146-1261919-57-65-352-110-208-112-416-18666126-10730142642690-44334013-9136729349261167163200-140130-9667571-28-36-39
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:NetCashProvidedByUsedInInvestingActivities ▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▆▆▇▇▇▇▁▆▆▂▇▅▇▇▇▆▇▇▇▇█▆▇-53-47-112-49-107-65-32-299-61-61-36-36-106-42-211-83-91-103-136-106-123-149-307-143-528-528-126-152-148-129-2535-765-413-2090-160-882-152-301-123-573-62-43-65-233205-445-79
us-gaap:PaymentsToAcquirePropertyPlantAndEquipment ▂▂▂▂▁▂▂▂▁▂▁▁▁▁▂▂▃▃▄▃▄▄█▆▆▆▄▆▆▅▆▇▄▅▄▆▄▄▃▃▂▂▁▂▁▂▃68676954437171633965424243426360778412198104130231168169169131185164152168201129140113166125113799262473164436479
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:NetCashProvidedByUsedInFinancingActivities ▄▂▄▄▄▄▄▄▄▂▄▄▄▄▄▃▃▁▃▁▂▂▁▃▃▃▃▂▂▃▇█▄▆▄▃▄▃▃▄▄▄▄▂▄▄▄-43-574-34-19-20-188-2-18-543-21-21-18-13-25-126-129-861-224-942-561-436-950-130-158-158-105-668-465-334116215785089758-66-20-234-14421-41-46-36-4668-341
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument nov:ThreePointSixZeroPercentUnsecuredSeniorNotesDueTwoThousandAndTwentyNineNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument nov:TwoPointSixZeroUnsecuredSeniorNotesDueTwoThousandAndTwentyTwoNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA

Common Stock Value

Common Stock Par Or Stated Value Per Share

Shares Outstanding

Shares Issued

us-gaap:StatementEquityComponents

us-gaap:SharesIssued

us-gaap:CommonStock



Period End2020-03-312019-12-312019-03-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-312007-12-312006-12-31
Value388386386383380379376419428427424421418417356351
Percentage of SharesIssued100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Common Stock Shares Issued

us-gaap:CommonStockSharesIssued



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value388385385385385383383382381380380380380378377377377375375386395418430429428428427427427426426426426423423423422421419419418418417
Percentage of CommonStockSharesIssued100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Common Stock Shares Outstanding

us-gaap:CommonStockSharesOutstanding



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value388385385385385383383382381380380380380378377377377375375386395418430429428428427427427426426426426423423423422421419419418418417
Percentage of CommonStockSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Common Stock Shares Authorized

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-312009-09-302009-06-302009-03-31
Value383382382380383381377377377377376376375375381388409431430430429428428428427427426425425423419419419418418418
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-312009-09-302009-06-302009-03-31
Value383382382380379378377377377377376376375375380387407429428428428426426426425425423422422420417417417416416416
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value-5.34-1.01-0.64-14.11-0.20.030.00.06-0.18-0.04-0.07-0.07-0.2-0.32-1.9-3.62-0.58-0.32-4.060.410.750.761.391.631.451.451.381.541.491.251.181.571.441.421.431.361.261.140.971.050.970.961.010.950.930.531.13
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value-5.34-1.01-0.64-14.11-0.20.030.00.06-0.18-0.04-0.07-0.07-0.2-0.32-1.9-3.62-0.58-0.32-4.060.410.740.761.391.621.441.441.371.531.491.241.171.561.431.421.421.351.251.130.961.050.960.961.010.940.920.531.13
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Income Loss From Continuing Operations Per Basic Share

Income Loss From Continuing Operations Per Diluted Share

Revenue From Contract With Customer Excluding Assessed Tax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value18832281212621321940239821542106179519691835183517591741169216461724218927223306390948205709558752555255577761725789560153075685531947344303425937403513314631723011294130323134308730103481
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems

us-gaap:IntersegmentElimination



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value-40-41-44-52-51-78-65-76-69-50-181-50-53-176486-215-253-317-365-392-507-541-556-569-475-475-302-316-307-276-249-249-260-227
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-2.1-1.8-2.1-2.4-2.6-3.3-3.0-3.6-3.8-2.5-9.9-3.0-10.128.7-13.1-14.7-14.5-13.4-11.9-13.0-11.2-9.7-10.2-9.0-5.2-5.1-5.3-4.9-4.7-4.4-4.9-4.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-2.1-1.8-2.1-2.4-2.6-3.3-3.0-3.6-3.8-2.5-9.9-2.7-3.0-10.128.7-13.1-14.7-14.5-13.4-11.9-13.0-11.2-9.7-10.2-9.0-9.0-5.2-5.1-5.3-4.9-4.7-4.4-4.9-4.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:IntersegmentElimination100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments



Period End2020-03-312019-03-31
Value557603
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax29.631.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax29.631.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments100.0100.0

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, nov:CompletionAndProductionSolutions



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-06-302014-03-312013-12-312013-09-302013-06-30
Value67579972866358178873573867069068265264860254353855874679887394813251191112711271002115510951057
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax35.835.034.231.129.932.934.135.037.335.037.237.137.235.633.031.225.527.424.122.319.723.221.321.417.318.718.918.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax35.835.034.231.129.932.934.135.037.335.037.237.137.235.633.031.225.527.424.122.319.723.221.321.421.417.318.718.918.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments nov:CompletionAndProductionSolutions100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, nov:RigTechnologies



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-06-30
Value557759649671603804637651546
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax29.633.330.531.531.133.529.630.931.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax29.633.330.531.531.133.529.630.931.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments nov:RigTechnologies100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, nov:WellboreTechnologies



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-06-302014-03-312013-12-312013-09-302013-06-30
Value691764793850807884847793711715693614555531526511631757834956117115291469144614461278137113951222
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax36.733.537.339.941.636.939.337.739.636.337.834.931.931.432.029.628.827.825.224.524.326.826.327.522.122.224.121.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax36.733.537.339.941.636.939.337.739.636.337.834.931.931.432.029.628.827.825.224.524.326.826.327.527.522.122.224.121.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments nov:WellboreTechnologies100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments, us-gaap:Subsegments, us-gaap:SubsegmentsConsolidationItems

us-gaap:OperatingSegments, nov:CompletionAndProductionSolutions, nov:Continental, us-gaap:IntersubsegmentEliminations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-06-302017-03-31
Value1313131716242022201113
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.70.60.60.80.81.00.91.01.10.60.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.70.60.60.80.81.00.91.01.10.60.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments nov:CompletionAndProductionSolutions nov:Continental us-gaap:IntersubsegmentEliminations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, nov:CompletionAndProductionSolutions, nov:LandAndOffshore, us-gaap:IntersubsegmentEliminations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-06-302017-03-31
Value1313131716242022201113
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.70.60.60.80.81.00.91.01.10.60.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.70.60.60.80.81.00.91.01.10.60.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments nov:CompletionAndProductionSolutions nov:LandAndOffshore us-gaap:IntersubsegmentEliminations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, nov:RigTechnologies, nov:Continental, us-gaap:IntersubsegmentEliminations



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-06-30
Value1115211929293629
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.50.71.01.01.21.31.71.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.50.71.01.01.21.31.71.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments nov:RigTechnologies nov:Continental us-gaap:IntersubsegmentEliminations100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, nov:RigTechnologies, nov:LandAndOffshore, us-gaap:IntersubsegmentEliminations



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-06-30
Value1115211929293629
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.50.71.01.01.21.31.71.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.50.71.01.01.21.31.71.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments nov:RigTechnologies nov:LandAndOffshore us-gaap:IntersubsegmentEliminations100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, nov:WellboreTechnologies, nov:Continental, us-gaap:IntersubsegmentEliminations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-06-302017-03-31
Value1717161416251618141312
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.90.70.80.70.81.00.70.90.80.70.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.90.70.80.70.81.00.70.90.80.70.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments nov:WellboreTechnologies nov:Continental us-gaap:IntersubsegmentEliminations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, nov:WellboreTechnologies, nov:LandAndOffshore, us-gaap:IntersubsegmentEliminations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-06-302017-03-31
Value1717161416251618141312
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.90.70.80.70.81.00.70.90.80.70.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.90.70.80.70.81.00.70.90.80.70.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments nov:WellboreTechnologies nov:LandAndOffshore us-gaap:IntersubsegmentEliminations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems, us-gaap:StatementGeographical, us-gaap:StatementBusinessSegments, us-gaap:Subsegments

us-gaap:OperatingSegments, nov:International, nov:CompletionAndProductionSolutions, nov:Continental



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-06-30
Value437510420364296439372374376
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax23.222.419.817.115.318.317.317.821.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax23.222.419.817.115.318.317.317.821.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments nov:International nov:CompletionAndProductionSolutions nov:Continental100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, nov:International, nov:RigTechnologies, nov:Continental



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-06-30
Value600521523443579419472377
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax26.324.524.522.824.119.522.421.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax26.324.524.522.824.119.522.421.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments nov:International nov:RigTechnologies nov:Continental100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, nov:International, nov:WellboreTechnologies, nov:Continental



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-06-30
Value313380355375331375362326249
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax16.616.716.717.617.115.616.815.514.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax16.616.716.717.617.115.616.815.514.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments nov:International nov:WellboreTechnologies nov:Continental100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, nov:LandDestination, nov:CompletionAndProductionSolutions, nov:LandAndOffshore



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-06-30
Value416468479456405509521509410
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax22.120.522.521.420.921.224.224.223.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax22.120.522.521.420.921.224.224.223.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments nov:LandDestination nov:CompletionAndProductionSolutions nov:LandAndOffshore100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, nov:LandDestination, nov:RigTechnologies, nov:LandAndOffshore



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-06-30
Value221151171215268206208173
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.77.18.011.111.29.69.99.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.77.18.011.111.29.69.99.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments nov:LandDestination nov:RigTechnologies nov:LandAndOffshore100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, nov:LandDestination, nov:WellboreTechnologies, nov:LandAndOffshore



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-06-30
Value529571616679665733707660490
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax28.125.029.031.834.330.632.831.327.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax28.125.029.031.834.330.632.831.327.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments nov:LandDestination nov:WellboreTechnologies nov:LandAndOffshore100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, nov:OffshoreDestination, nov:CompletionAndProductionSolutions, nov:LandAndOffshore



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-06-30
Value246318236190160255194207231
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax13.113.911.18.98.210.69.09.813.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax13.113.911.18.98.210.69.09.813.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments nov:OffshoreDestination nov:CompletionAndProductionSolutions nov:LandAndOffshore100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, nov:OffshoreDestination, nov:RigTechnologies, nov:LandAndOffshore



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-06-30
Value527483479369507402407344
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax23.122.722.519.021.118.719.319.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax23.122.722.519.021.118.719.319.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments nov:OffshoreDestination nov:RigTechnologies nov:LandAndOffshore100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, nov:OffshoreDestination, nov:WellboreTechnologies, nov:LandAndOffshore



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-06-30
Value145176161157126126124115111
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.77.77.67.46.55.35.85.56.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.77.77.67.46.55.35.85.56.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments nov:OffshoreDestination nov:WellboreTechnologies nov:LandAndOffshore100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, srt:NorthAmerica, nov:CompletionAndProductionSolutions, nov:Continental



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-06-30
Value225276295282269325343342265
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.912.113.913.213.913.615.916.215.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.912.113.913.213.913.615.916.215.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments srt:NorthAmerica nov:CompletionAndProductionSolutions nov:Continental100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, srt:NorthAmerica, nov:RigTechnologies, nov:Continental



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-06-30
Value148113127141196189143140
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.55.36.07.38.28.86.88.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.55.36.07.38.28.86.88.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments srt:NorthAmerica nov:RigTechnologies nov:Continental100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, srt:NorthAmerica, nov:WellboreTechnologies, nov:Continental



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-06-30
Value361367422461460484469449352
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax19.216.119.821.623.720.221.821.320.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax19.216.119.821.623.720.221.821.320.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments srt:NorthAmerica nov:WellboreTechnologies nov:Continental100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems, us-gaap:StatementGeographical, us-gaap:Subsegments

us-gaap:OperatingSegments, nov:International, nov:Continental



Period End2020-03-31
Value470
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax25.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax25.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments nov:International nov:Continental100.0

us-gaap:OperatingSegments, nov:LandDestination, nov:LandAndOffshore



Period End2020-03-31
Value151
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments nov:LandDestination nov:LandAndOffshore100.0

us-gaap:OperatingSegments, nov:OffshoreDestination, nov:LandAndOffshore



Period End2020-03-31
Value396
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax21.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax21.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments nov:OffshoreDestination nov:LandAndOffshore100.0

us-gaap:OperatingSegments, srt:NorthAmerica, nov:Continental



Period End2020-03-31
Value77
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments srt:NorthAmerica nov:Continental100.0

us-gaap:ConsolidationItems, us-gaap:Subsegments, us-gaap:SubsegmentsConsolidationItems

us-gaap:IntersegmentElimination, nov:Continental, us-gaap:IntersubsegmentEliminations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-06-302017-03-31
Value-40-41-44-52-51-78-65-76-69-53-44
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-2.1-1.8-2.1-2.4-2.6-3.3-3.0-3.6-3.8-3.0-2.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-2.1-1.8-2.1-2.4-2.6-3.3-3.0-3.6-3.8-3.0-2.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:IntersegmentElimination nov:Continental us-gaap:IntersubsegmentEliminations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IntersegmentElimination, nov:LandAndOffshore, us-gaap:IntersubsegmentEliminations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-06-302017-03-31
Value-40-41-44-52-51-78-65-76-69-53-44
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-2.1-1.8-2.1-2.4-2.6-3.3-3.0-3.6-3.8-3.0-2.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-2.1-1.8-2.1-2.4-2.6-3.3-3.0-3.6-3.8-3.0-2.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:IntersegmentElimination nov:LandAndOffshore us-gaap:IntersubsegmentEliminations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, nov:Continental, us-gaap:IntersubsegmentEliminations



Period End2020-03-31
Value10
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments nov:Continental us-gaap:IntersubsegmentEliminations100.0

us-gaap:OperatingSegments, nov:LandAndOffshore, us-gaap:IntersubsegmentEliminations



Period End2020-03-31
Value10
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments nov:LandAndOffshore us-gaap:IntersubsegmentEliminations100.0

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome



Period End2019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value001210-1-2-21-5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.00.00.10.00.0-0.1-0.1-0.10.1-0.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.00.00.10.00.0-0.1-0.1-0.10.1-0.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome0.00.0100.0100.0100.00.0100.0100.0100.0100.0100.0

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedGainLossNetCashFlowHedgeParent



Period End2019-12-312019-09-302019-06-302018-09-302017-06-30
Value0.00.01000000.01000000.01000000.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.00.00.00.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.00.00.00.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.00.0100.0100.0100.0

us-gaap:StatementBusinessSegments

us-gaap:IntersegmentElimination



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-40-41-44-52-51-78-65-76-69
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-2.1-1.8-2.1-2.4-2.6-3.3-3.0-3.6-3.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-2.1-1.8-2.1-2.4-2.6-3.3-3.0-3.6-3.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:IntersegmentElimination100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementGeographical, us-gaap:Subsegments

nov:International, nov:Continental



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value122014901296126210701393115311729531126103710021093
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax64.865.361.059.255.258.153.555.753.157.256.557.062.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax64.865.361.059.255.258.153.555.753.157.256.557.062.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax nov:International nov:Continental100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

nov:LandDestination, nov:LandAndOffshore



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value1096126012461306128515101434137712011271119510731000
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax58.255.258.661.366.263.066.665.466.964.665.161.057.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax58.255.258.661.366.263.066.665.466.964.665.161.057.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax nov:LandDestination nov:LandAndOffshore100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

nov:OffshoreDestination, nov:LandAndOffshore



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value7871021880826655888720729594698640686741
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax41.844.841.438.733.837.033.434.633.135.434.939.042.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax41.844.841.438.733.837.033.434.633.135.434.939.042.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax nov:OffshoreDestination nov:LandAndOffshore100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

srt:NorthAmerica, nov:Continental



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value66379183087087010051001934842843798757
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax35.234.739.040.844.841.946.544.346.942.843.543.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax35.234.739.040.844.841.946.544.346.942.843.543.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:NorthAmerica nov:Continental100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Sales Revenue Net

Sales Revenue Goods Net

Cost Of Revenue

us-gaap:CostOfRevenue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value16591905197520701684198917611751150818021550155015281532215115671689194523342634305436434168405938003800438146754327433540434291394834283036298425762430217121752066201320702155219621352442
Percentage of CostOfRevenue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax88.183.592.997.186.882.981.883.184.091.584.584.586.988.0127.195.298.088.985.779.778.175.673.072.772.372.375.875.774.777.476.275.574.272.470.670.168.969.269.068.668.668.468.368.871.170.970.2

Cost Of Goods And Services Sold

us-gaap:CostOfGoodsAndServicesSold



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value16591905197520701684198917611751150818021550155015281532215115671689194523342634305436434168405938003800438146754327433540434291394834283036298425762430217121752066201320702155219621352442
Percentage of CostOfGoodsAndServicesSold100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax88.183.592.997.186.882.981.883.184.091.584.584.586.988.0127.195.298.088.985.779.778.175.673.072.772.372.375.875.774.777.476.275.574.272.470.670.168.969.269.068.668.668.468.368.871.170.970.2

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-5-7-4-2-13-2-1-4-4-48-4
Percentage of CostOfGoodsAndServicesSold-0.3-0.4-0.2-0.1-0.10.2-0.1-0.1-0.3-0.2-0.30.5-0.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.3-0.3-0.2-0.1-0.10.1-0.1-0.0-0.2-0.2-0.20.5-0.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome0.00.00.0-200.00.0150.0-200.00.0400.0200.0200.0800.080.0

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedGainLossNetCashFlowHedgeParent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-06-30
Value-5-7-4-2-13-2-18
Percentage of CostOfGoodsAndServicesSold-0.3-0.4-0.2-0.1-0.10.2-0.1-0.10.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.3-0.3-0.2-0.1-0.10.1-0.1-0.00.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.00.00.0-200.00.00.0-200.00.0800.0

Cost Of Goods Sold

Cost Of Services

Gross Profit

us-gaap:GrossProfit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value22437615162256409393355287167285285231209-4597935244359672855117715361528145514551396149714621266126413951371130612671275116410839759979459289629798918751039
Percentage of GrossProfit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.916.57.12.913.217.118.216.916.08.515.515.513.112.0-27.14.82.011.113.220.321.924.426.927.327.727.724.224.325.322.623.824.525.827.629.429.931.130.831.031.431.431.631.731.228.929.129.8

Selling General And Administrative Expense

us-gaap:SellingGeneralAndAdministrativeExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value283289293417304322320303288278292292293306307293305433386383417607524540542542535540516497513491473427390427392375366373349338325390279334319
Percentage of SellingGeneralAndAdministrativeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax15.012.713.819.615.713.414.914.416.014.115.915.916.717.618.117.817.719.814.211.610.712.69.29.710.310.39.38.78.98.99.78.68.99.09.110.010.510.711.611.811.611.510.712.49.011.19.2

Operating Income Loss

us-gaap:OperatingIncomeLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value-1950-349-154-5728-48877352-1-111-7-7-62-97-766-1186-270-189-1632234438570913988913913861957946769751903898879877848772708609624596590637608601386720
Percentage of OperatingIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-103.6-15.3-7.2-268.7-2.53.63.42.5-0.1-5.6-0.4-0.4-3.5-5.6-45.3-72.1-15.7-8.6-60.07.111.211.816.017.717.417.414.915.516.313.714.215.916.918.620.419.920.620.219.419.719.820.121.019.419.512.820.7

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, nov:CompletionAndProductionSolutions



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-06-302014-03-312013-12-312013-09-302013-06-30
Value-101357-24-1932-35644640161944278-134-61-33-38137879211185157157137175175127
Percentage of OperatingIncomeLoss51.9-16.315.633.772.973.663.076.9-1600.0-17.1-628.6-43.5-8.217.55.112.220.1-0.11.317.813.923.118.717.215.918.318.516.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-53.82.5-1.1-90.6-1.82.72.11.90.91.02.41.50.5-7.9-3.7-1.9-1.70.00.12.01.63.73.33.03.02.42.83.02.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments nov:CompletionAndProductionSolutions-150.17.1-3.3-291.4-6.08.16.35.42.42.86.54.11.2-22.3-11.2-6.1-6.80.10.48.98.315.915.513.913.913.715.216.012.0

us-gaap:OperatingSegments, nov:RigTechnologies



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-06-30
Value-202-23-110-422317558626
Percentage of OperatingIncomeLoss10.46.671.47.4-64.686.279.5119.2-9.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-10.7-1.0-5.2-19.81.63.12.72.90.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments nov:RigTechnologies-36.3-3.0-16.9-62.95.19.39.19.51.1

us-gaap:OperatingSegments, nov:WellboreTechnologies



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-06-302014-03-312013-12-312013-09-302013-06-30
Value-663-31742-32951941403812-210-24-57-439-94-146-91-1723-73879175278263263221243306184
Percentage of OperatingIncomeLoss34.090.8-27.357.5-39.647.154.873.1-1200.018.9-0.038.758.857.37.954.148.1105.6-3.08.713.919.228.128.825.725.432.323.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-35.2-13.92.0-154.51.01.71.91.80.7-1.10.0-1.4-3.3-25.9-5.7-8.5-4.2-63.3-0.21.01.63.15.05.05.03.83.95.33.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments nov:WellboreTechnologies-95.9-41.55.3-387.62.44.64.74.81.7-2.90.0-3.9-10.3-82.7-17.9-28.6-14.4-227.6-0.84.06.711.418.918.218.217.317.721.915.1

us-gaap:StatementBusinessSegments

us-gaap:IntersegmentElimination



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value-72-66-62-79-63-93-71-88-47-117-127-125-111-101-89-86-80
Percentage of OperatingIncomeLoss3.718.940.31.4131.2-106.9-97.3-169.24700.0-15.6-14.1-13.9-12.6-11.5-10.5-11.1-11.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-3.8-2.9-2.9-3.7-3.2-3.9-3.3-4.2-2.6-2.2-2.2-2.4-2.3-2.3-2.1-2.3-2.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:IntersegmentElimination180.0161.0140.9151.9123.5119.2109.2115.868.10.00.00.00.00.00.00.00.0

Interest Expense

us-gaap:InterestExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value22252525252224232425262626252525302527242626262627272627263028211198989141212131313141313
Percentage of InterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.21.11.21.21.30.91.11.11.31.31.41.41.51.41.51.51.71.11.00.70.70.50.50.50.50.50.50.40.40.50.50.40.20.20.20.20.20.30.40.40.40.40.40.40.50.40.4

Other Nonoperating Income Expense

us-gaap:OtherNonoperatingIncomeExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-06-302013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value-3-54-10-8-18-29-20-3-47-14-6-16-2-11-16-30-34-21-17-20-30-56-789-21-21-17-1613-21-28-22-5-16-130-7-19-7-23-3-16-23-13-38-36
Percentage of OtherNonoperatingIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.2-2.4-0.5-0.4-0.9-1.2-0.9-0.1-2.6-0.7-0.3-0.9-0.1-0.6-0.9-1.8-2.0-1.0-0.6-0.6-0.8-1.2-1.40.2-0.4-0.4-0.3-0.30.2-0.4-0.5-0.4-0.1-0.4-0.30.0-0.2-0.6-0.2-0.8-0.1-0.5-0.7-0.4-1.3-1.0

Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax

Income Loss From Continuing Operations

Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-30
Value-2205-431-189-5757-85413330-63-128-40502830984893787887861712
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-117.1-18.9-8.9-270.0-4.41.71.51.4-3.5-6.5-2.210.414.517.617.013.614.414.912.7

Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest

Income Loss From Continuing Operations Before Income Taxes Domestic

Income Loss From Continuing Operations Before Income Taxes Foreign

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value-156-4660-373-10262953-130-3-13-14-9-88120-121-118-15236105189233283284284260272283239224203265285269270252226189186169186197184192131228
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-8.3-2.02.8-17.5-0.51.11.30.20.2-6.6-0.2-0.7-0.8-0.5-5.27.3-7.0-5.4-5.61.12.73.94.15.15.45.44.54.44.94.34.23.65.06.06.36.36.76.46.05.95.66.36.55.96.24.46.5

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value1111-110201-24
Percentage of IncomeTaxExpenseBenefit-0.6-2.21.7-0.3-3.83.40.066.7-0.0-33.314.3-44.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.00.00.0-0.00.00.00.10.00.1-0.10.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome0.00.00.0100.0-50.0100.00.0-200.0-0.0-50.0-200.0-80.0

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedGainLossNetCashFlowHedgeParent



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312018-09-302017-06-30
Value1111-11-2
Percentage of IncomeTaxExpenseBenefit-0.6-2.21.7-0.3-3.83.414.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.00.00.0-0.00.0-0.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.00.00.0100.00.0100.0-200.0

Income Taxes Paid Net

us-gaap:IncomeTaxesPaidNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value1463114129311842-80334156853152-322210056496283211572314213218497171252299797224140934462662078216110132619433178
Percentage of IncomeTaxesPaidNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.72.80.51.91.50.10.50.42.3-4.11.82.33.20.53.28.8-1.50.83.014.42.05.03.810.95.43.53.88.93.24.45.616.85.23.32.512.78.56.52.75.53.310.46.311.02.2

Profit Loss

us-gaap:ProfitLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value-2049-385-249-5384-7515425-66-15-27-27-74-120-717-1364-217-118-1522156286313597701620620589661636531500668609602604573528480404437404399419391387222473
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-108.8-16.9-11.7-252.5-3.90.60.21.2-3.7-0.8-1.5-1.5-4.2-6.9-42.4-82.9-12.6-5.4-55.94.77.36.510.512.511.811.810.210.711.09.59.411.811.412.714.013.514.113.712.813.813.413.613.812.512.57.413.6

us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterest



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-2-552312
Percentage of ProfitLoss0.12.0-0.1-2.775.04.0-3.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.1-0.20.20.10.10.00.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:NoncontrollingInterest0.00.00.00.00.00.00.0

us-gaap:Parent



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-2047-244-5389-77124-68
Percentage of ProfitLoss99.998.0100.1102.725.096.0103.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-108.7-11.5-252.8-4.00.01.1-3.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:Parent0.00.00.00.00.00.00.0

us-gaap:RetainedEarnings



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-2047-244-5389-77124-68
Percentage of ProfitLoss99.998.0100.1102.725.096.0103.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-108.7-11.5-252.8-4.00.01.1-3.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.0

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-30
Value-2279-284-376-5368-53-97-29-213-19-1512312324-27-883-1320-234126-1600-202485-171125292709709552654838388337-4546760431734514344514508422580284382392477414
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-121.0-12.5-17.7-251.8-2.7-4.0-1.3-10.1-1.1-0.86.76.71.4-1.6-52.2-80.2-13.65.8-58.8-6.112.4-3.52.25.213.513.59.610.614.56.96.4-80.014.39.117.112.19.214.616.113.319.39.712.612.515.513.8

Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest

Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-30
Value-2281-284-381-5363-51-94-26-212-17-1612212225-25-886-1322-234127-1598-202485-171-1787757428732-1472340513505419580282379389479416
Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-121.1-12.5-17.9-251.5-2.6-3.9-1.2-10.1-0.9-0.86.66.61.4-1.4-52.4-80.3-13.65.8-58.7-6.112.4-3.5-31.414.29.017.0-34.69.114.616.113.219.39.612.512.415.513.8

Net Income Loss

us-gaap:NetIncomeLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value-2047-385-244-5389-7712124-68-14-26-26-75-122-714-1362-217-119-1523155289310595699619619589658636531502668612605606574532481407440404401422394385220470
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-108.7-16.9-11.5-252.8-4.00.50.01.1-3.8-0.7-1.4-1.4-4.3-7.0-42.2-82.7-12.6-5.4-56.04.77.46.410.412.511.811.810.210.711.09.59.511.811.512.814.113.514.213.712.913.913.413.613.912.612.57.313.5

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value45321-18-1-3117-5
Percentage of NetIncomeLoss-0.2-1.3-1.2-0.0-1.3-8.3800.0-4.24.4-7.1-3.8-9.34.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.20.20.10.10.1-0.00.4-0.0-0.20.10.10.4-0.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome0.00.00.0200.00.0-50.0800.00.0300.0-50.0-50.0700.0100.0

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedGainLossNetCashFlowHedgeParent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-06-30
Value4632102-17
Percentage of NetIncomeLoss-0.2-1.6-1.2-0.0-1.30.0200.0-4.2-9.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.20.30.10.10.10.00.1-0.00.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.00.00.0200.00.00.0200.00.0700.0

Net Income Loss Attributable To Noncontrolling Interest

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-06-302013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value-20-5523312-1-1-112-3-20111-332211100-20-3-3-2-1-4-1-3-30-2-3-3223
Percentage of NetIncomeLossAttributableToNoncontrollingInterest100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.10.0-0.20.20.10.10.10.00.1-0.1-0.1-0.10.10.1-0.2-0.10.00.00.00.0-0.10.10.00.00.00.00.00.00.0-0.00.0-0.1-0.1-0.0-0.0-0.1-0.0-0.1-0.10.0-0.1-0.1-0.10.10.10.1

Assets

us-gaap:Assets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value10690131491400514349200021979619893197582001020206209342088720904211402219423784247542672529628312253242433562342703382735480348123467333593335563148428662278332628725515245442375623156230502223121648214662153221479
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, nov:CompletionAndProductionSolutions



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value38266233578257655916707272876192
Percentage of Assets29.131.528.627.322.121.120.919.7
Percentage of Assets29.131.528.627.322.121.120.919.7
Percentage of Assets us-gaap:OperatingSegments nov:CompletionAndProductionSolutions100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, nov:RigTechnologies



Period End2019-12-312018-12-312017-12-31
Value375839064625
Percentage of Assets28.619.722.9
Percentage of Assets28.619.722.9
Percentage of Assets us-gaap:OperatingSegments nov:RigTechnologies100.0100.0100.0

us-gaap:OperatingSegments, nov:WellboreTechnologies



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value40787929784879118766116871186211032
Percentage of Assets31.040.138.837.432.834.834.135.0
Percentage of Assets31.040.138.837.432.834.834.135.0
Percentage of Assets us-gaap:OperatingSegments nov:WellboreTechnologies100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

us-gaap:IntersegmentElimination



Period End2019-12-312018-12-312017-12-312016-12-312012-12-312011-12-312010-12-31
Value1487172819512137347927012542
Percentage of Assets11.38.79.710.111.110.611.0
Percentage of Assets11.38.79.710.111.110.611.0
Percentage of Assets us-gaap:IntersegmentElimination100.0100.0100.0100.0100.0100.0100.0

Liabilities

us-gaap:Liabilities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value51365303587658626162590759175790585960466783686569197137730675988321102651142212220133021279012651124091268812482129481264212877111288979890277677787730568516755718868276811688673048755
Percentage of Liabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets48.040.342.040.930.829.829.729.329.329.932.432.933.133.832.931.933.638.438.639.141.038.136.936.735.835.937.337.638.435.331.332.029.530.529.828.829.231.230.731.532.133.940.8

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value10690131491400514349200021979619893197582001020206209342088720904211402219423784247542672529628312253242433562342703382735480348123467333593335563148428662278332628725515245442375623156230502223121648214662153221479
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Stockholders Equity

us-gaap:StockholdersEquity



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value5486777880578411137651381913906139001408214094140841395313921139401481816118163551638318126189271903720692215232133222697222302162720859205492023919574188201841617619171341679016289157481528614728144671411312628
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets51.359.257.558.668.869.869.970.470.469.867.366.866.665.966.867.866.161.361.260.658.761.762.863.164.063.962.462.161.264.368.367.670.169.169.870.770.368.368.868.067.465.558.8

Assets Current

us-gaap:AssetsCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value590261136515676669387279722170087186721778257741774478768711920410048118011293314167152991616216670160031721116423162551522114994156781366713014128361211012038112261073910535103269826954595989657
Percentage of AssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets55.246.546.547.234.736.836.335.535.935.737.437.137.037.339.238.740.644.243.745.447.248.248.647.348.547.246.945.344.749.847.746.848.847.549.047.346.445.746.445.444.544.645.0

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-312008-12-312007-12-312006-12-31
Value11151171131311211270142712931137123614371722153014791408151016611759208018462544302435364091388536883436274123272441331917021917339035353870344030603333307026882608262231922286223215431842957
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets10.48.99.47.86.37.26.55.86.27.18.27.37.16.76.87.07.17.86.28.19.310.511.911.510.49.97.96.97.310.55.96.912.913.915.814.513.214.513.812.412.112.20.00.00.07.20.00.0

Receivables Net Current

us-gaap:ReceivablesNetCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value1879185517991973179321012005196721022015206020861978208318082044221229263325347640244416448244275310489648014424427943204033386033303291310928492757242524082387211121873136
Percentage of ReceivablesNetCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets17.614.112.813.89.010.610.110.010.510.09.810.09.59.98.18.68.910.911.211.112.413.213.113.115.014.113.813.212.813.714.113.912.712.912.712.011.910.510.811.09.810.214.6

Inventory Net

us-gaap:InventoryNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value2032219725372858313129863177315831463003321932073254332541614287453446785172539453785281546451985659560360786083613558915989550145284030390737563570338835623443342334903806
Percentage of InventoryNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets19.016.718.119.915.715.116.016.015.714.915.415.415.615.718.718.018.317.517.517.316.615.715.915.415.916.117.518.118.318.720.919.817.215.815.915.815.414.716.015.915.916.217.7

Prepaid Expense And Other Assets Current

us-gaap:PrepaidExpenseAndOtherAssetsCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value237247251229205200263301287267306319380395467422503491530562569604619595709576625579474574592499426325339381258
Percentage of PrepaidExpenseAndOtherAssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.21.91.81.61.01.01.31.51.41.31.51.51.81.92.11.82.01.81.81.81.81.81.81.82.01.71.81.71.41.82.11.81.61.31.41.61.1

Property Plant And Equipment Gross

us-gaap:PropertyPlantAndEquipmentGross



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value53375484556154485276540552124523366029032701
Percentage of PropertyPlantAndEquipmentGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets40.627.727.525.819.716.115.014.414.312.612.5

us-gaap:PropertyPlantAndEquipmentByType

nov:OperatingEquipment



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value29463140316931023055306029602463195515391429
Percentage of PropertyPlantAndEquipmentGross55.257.357.056.957.956.656.854.553.453.052.9
Percentage of Assets22.415.915.714.711.49.18.57.87.76.76.6
Percentage of Assets nov:OperatingEquipment0.00.00.00.00.00.00.00.00.00.00.0

nov:RentalEquipment



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value851597581557639817758712636628594
Percentage of PropertyPlantAndEquipmentGross15.910.910.410.212.115.114.515.717.421.622.0
Percentage of Assets6.53.02.92.62.42.42.22.32.52.72.8
Percentage of Assets nov:RentalEquipment0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:BuildingImprovements



Period End2019-12-312018-12-312017-12-31
Value130912711340
Percentage of PropertyPlantAndEquipmentGross24.523.224.1
Percentage of Assets10.06.46.6
Percentage of Assets us-gaap:BuildingImprovements0.00.00.0

us-gaap:Land



Period End2019-12-312018-12-312017-12-31
Value231227252
Percentage of PropertyPlantAndEquipmentGross4.34.14.5
Percentage of Assets1.81.11.2
Percentage of Assets us-gaap:Land0.00.00.0

Accumulated Depreciation Depletion And Amortization Property Plant And Equipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value29832687255922982152204318041578-1215-1063-865
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets22.713.612.710.98.16.15.25.0-4.8-4.6-4.0

Property Plant And Equipment Net

us-gaap:PropertyPlantAndEquipmentNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value2003235423612356260527972813285929263002303130523108315032613277330331243122325032163362337734403437340833333210321529452818270025312445196719211861184018081792181018361677
Percentage of PropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets18.717.916.916.413.014.114.114.514.614.914.514.614.914.914.713.813.311.710.510.49.910.09.910.29.79.89.69.69.69.49.89.79.69.68.08.18.08.08.18.38.48.57.8

us-gaap:StatementGeographical

country:AE



Period End2019-12-312018-12-312017-12-312016-12-312015-12-31
Value5260659058
Percentage of PropertyPlantAndEquipmentNet2.22.12.22.91.9
Percentage of Assets0.40.30.30.40.2
Percentage of Assets country:AE0.00.00.00.00.0

country:BR



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value1942172692812262902701629232
Percentage of PropertyPlantAndEquipmentNet8.27.89.08.97.28.67.95.53.81.7
Percentage of Assets1.51.11.31.30.80.90.80.50.40.1
Percentage of Assets country:BR0.00.00.00.00.00.00.00.00.00.0

country:CA



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value777984827899123131113118
Percentage of PropertyPlantAndEquipmentNet3.32.82.82.62.52.93.64.44.66.4
Percentage of Assets0.60.40.40.40.30.30.40.40.40.5
Percentage of Assets country:CA0.00.00.00.00.00.00.00.00.00.0

country:DK



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value111119128120128144166174
Percentage of PropertyPlantAndEquipmentNet4.74.34.33.84.14.34.95.9
Percentage of Assets0.80.60.60.60.50.40.50.6
Percentage of Assets country:DK0.00.00.00.00.00.00.00.0

country:GB



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value112125140137163196200173131116
Percentage of PropertyPlantAndEquipmentNet4.84.54.74.35.25.85.95.95.46.3
Percentage of Assets0.90.60.70.60.60.60.60.50.50.5
Percentage of Assets country:GB0.00.00.00.00.00.00.00.00.00.0

country:MX



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value434871779311010187
Percentage of PropertyPlantAndEquipmentNet1.81.72.42.43.03.33.03.0
Percentage of Assets0.30.20.40.40.30.30.30.3
Percentage of Assets country:MX0.00.00.00.00.00.00.00.0

country:RU



Period End2019-12-312018-12-312017-12-312016-12-312015-12-31
Value1669908868
Percentage of PropertyPlantAndEquipmentNet0.72.53.02.82.2
Percentage of Assets0.10.30.40.40.3
Percentage of Assets country:RU0.00.00.00.00.0

country:SG



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value28475963788794938675
Percentage of PropertyPlantAndEquipmentNet1.21.72.02.02.52.62.83.23.54.1
Percentage of Assets0.20.20.30.30.30.30.30.30.30.3
Percentage of Assets country:SG0.00.00.00.00.00.00.00.00.00.0

country:US



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value1257160316751810173518181830160614931045
Percentage of PropertyPlantAndEquipmentNet53.457.355.857.555.554.153.754.561.156.8
Percentage of Assets9.68.18.38.66.55.45.35.15.94.5
Percentage of Assets country:US0.00.00.00.00.00.00.00.00.00.0

currency:KRW



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value77919794102113115112
Percentage of PropertyPlantAndEquipmentNet3.33.33.23.03.33.43.43.8
Percentage of Assets0.60.50.50.40.40.30.30.4
Percentage of Assets currency:KRW0.00.00.00.00.00.00.00.0

nov:OtherCountries



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value387339324308521505509407
Percentage of PropertyPlantAndEquipmentNet16.412.110.89.816.715.014.913.8
Percentage of Assets2.91.71.61.51.91.51.51.3
Percentage of Assets nov:OtherCountries0.00.00.00.00.00.00.00.0

Goodwill

us-gaap:Goodwill



Period End2020-03-312019-12-312019-09-302019-06-302019-05-312019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value15152807323632066300629262646339627362176227616561296065606760156986700369808465850785098539861486408875904990368997900571726940691762066151594259495908579055255532554454895225
Percentage of Goodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets14.221.323.122.30.031.531.631.931.731.130.829.429.329.028.727.129.428.326.128.627.226.225.425.125.525.026.026.126.826.822.824.224.923.624.124.225.025.525.124.925.625.825.524.3

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, nov:CompletionAndProductionSolutions



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value10542041212220581997206721061314
Percentage of Goodwill37.532.634.133.928.624.223.318.3
Percentage of Assets8.010.310.59.77.56.26.04.2
Percentage of Assets us-gaap:OperatingSegments nov:CompletionAndProductionSolutions27.532.736.735.733.829.228.921.2

us-gaap:OperatingSegments, nov:RigTechnologies



Period End2019-12-312018-12-312017-12-31
Value91012121149
Percentage of Goodwill32.419.318.5
Percentage of Assets6.96.15.7
Percentage of Assets us-gaap:OperatingSegments nov:RigTechnologies24.231.024.8

us-gaap:OperatingSegments, nov:WellboreTechnologies



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value8433011295628742874435744253769
Percentage of Goodwill30.048.147.547.441.251.048.952.6
Percentage of Assets6.415.214.613.610.813.012.712.0
Percentage of Assets us-gaap:OperatingSegments nov:WellboreTechnologies20.738.037.736.332.837.337.334.2

us-gaap:StatementBusinessSegments

nov:CompletionAndProductionSolutions



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312017-12-312016-12-312016-09-302015-12-312014-12-312013-12-312012-12-31
Value47310541078104120412122205820061997206921061314
Percentage of Goodwill31.237.533.332.532.634.133.933.328.624.223.318.3
Percentage of Assets4.48.07.77.310.310.59.79.07.56.26.04.2
Percentage of Assets nov:CompletionAndProductionSolutions0.00.00.00.00.00.00.00.00.00.00.00.0

nov:RigTechnologies



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312017-12-312016-12-31
Value71291010011005121211491135
Percentage of Goodwill47.032.430.931.319.318.518.7
Percentage of Assets6.76.97.17.06.15.75.4
Percentage of Assets nov:RigTechnologies0.00.00.00.00.00.00.0

nov:WellboreTechnologies



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312017-12-312016-12-312016-09-302015-12-312014-12-312013-12-312012-12-31
Value3308431157116030112956287428712874435744253769
Percentage of Goodwill21.830.035.836.248.147.547.447.741.251.048.952.6
Percentage of Assets3.16.48.38.115.214.613.612.910.813.012.712.0
Percentage of Assets nov:WellboreTechnologies0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StatementBusinessSegments, us-gaap:Subsegments

nov:CompletionAndProductionSolutions, nov:CompletionTools



Period End2019-12-312019-06-30
Value2025
Percentage of Goodwill0.70.8
Percentage of Assets0.20.2
Percentage of Assets nov:CompletionAndProductionSolutions nov:CompletionTools0.00.0

nov:RigTechnologies, nov:MarineConstruction



Period End2019-12-312019-06-30
Value57154
Percentage of Goodwill2.04.8
Percentage of Assets0.41.1
Percentage of Assets nov:RigTechnologies nov:MarineConstruction0.00.0

nov:WellboreTechnologies, nov:Downhole



Period End2019-12-312019-06-30
Value124265
Percentage of Goodwill4.48.3
Percentage of Assets0.91.8
Percentage of Assets nov:WellboreTechnologies nov:Downhole0.00.0

nov:WellboreTechnologies, nov:GrantPrideco



Period End2019-12-312019-06-30
Value125194
Percentage of Goodwill4.56.1
Percentage of Assets1.01.4
Percentage of Assets nov:WellboreTechnologies nov:GrantPrideco0.00.0

nov:WellboreTechnologies, nov:ReedHycalog



Period End2019-12-312019-06-30
Value358359
Percentage of Goodwill12.811.2
Percentage of Assets2.72.5
Percentage of Assets nov:WellboreTechnologies nov:ReedHycalog0.00.0

us-gaap:Subsegments

nov:FiberGlassSystems



Period End2020-03-31
Value346
Percentage of Goodwill22.8
Percentage of Assets3.2
Percentage of Assets nov:FiberGlassSystems0.0

nov:MDTotco



Period End2020-03-312019-12-31
Value3263
Percentage of Goodwill2.12.2
Percentage of Assets0.30.5
Percentage of Assets nov:MDTotco0.00.0

nov:MarineConstruction



Period End2020-03-31
Value51
Percentage of Goodwill3.4
Percentage of Assets0.5
Percentage of Assets nov:MarineConstruction0.0

nov:PFT



Period End2020-03-312019-12-31
Value63407
Percentage of Goodwill4.214.5
Percentage of Assets0.63.1
Percentage of Assets nov:PFT0.00.0

nov:ReedHycalog



Period End2020-03-31
Value124
Percentage of Goodwill8.2
Percentage of Assets1.2
Percentage of Assets nov:ReedHycalog0.0

nov:RigEquipment



Period End2020-03-31
Value661
Percentage of Goodwill43.6
Percentage of Assets6.2
Percentage of Assets nov:RigEquipment0.0

nov:WellSite



Period End2020-03-31
Value174
Percentage of Goodwill11.5
Percentage of Assets1.6
Percentage of Assets nov:WellSite0.0

nov:XLSystems



Period End2020-03-31
Value64
Percentage of Goodwill4.2
Percentage of Assets0.6
Percentage of Assets nov:XLSystems0.0

Intangible Assets Net Excluding Goodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-31
Value53485286690030203301353038494444505547434073410340524300
Percentage of IntangibleAssetsNetExcludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets5.06.56.26.315.316.316.714.413.214.515.116.017.818.820.0

us-gaap:FiniteLivedIntangibleAssetsByMajorClass

nov:OtherFiniteLivedIntangibleAssets



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312010-12-312009-12-31
Value138114175408464548768760481410
Percentage of IntangibleAssetsNetExcludingGoodwill16.23.85.311.612.112.315.216.011.710.1
Percentage of Assets1.00.60.91.91.71.62.22.42.11.9
Percentage of Assets nov:OtherFiniteLivedIntangibleAssets0.00.00.00.00.00.00.00.00.00.0

us-gaap:CustomerRelationships



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312010-12-312009-12-31
Value293172619562150238627152946261523972453
Percentage of IntangibleAssetsNetExcludingGoodwill34.457.259.360.962.061.158.355.158.460.5
Percentage of Assets2.28.79.710.28.98.18.58.310.411.4
Percentage of Assets us-gaap:CustomerRelationships0.00.00.00.00.00.00.00.00.00.0

us-gaap:Patents



Period End2019-12-312018-12-312017-12-312016-12-31
Value74247218240
Percentage of IntangibleAssetsNetExcludingGoodwill8.78.26.66.8
Percentage of Assets0.61.21.11.1
Percentage of Assets us-gaap:Patents0.00.00.00.0

us-gaap:Trademarks



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312010-12-312009-12-31
Value67550568588615645698725582546
Percentage of IntangibleAssetsNetExcludingGoodwill7.918.217.216.716.014.513.815.314.213.5
Percentage of Assets0.52.82.82.82.31.92.02.32.52.5
Percentage of Assets us-gaap:Trademarks0.00.00.00.00.00.00.00.00.00.0

us-gaap:IndefiniteLivedIntangibleAssetsByMajorClass

us-gaap:TradeNames



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value280383384384384536643643643643
Percentage of IntangibleAssetsNetExcludingGoodwill32.912.711.610.910.012.112.713.615.815.7
Percentage of Assets2.11.91.91.81.41.61.82.02.52.8
Percentage of Assets us-gaap:TradeNames0.00.00.00.00.00.00.00.00.00.0

us-gaap:StatementBusinessSegments

nov:CompletionAndProductionSolutions



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value502752642831005116011911296143716141576
Percentage of IntangibleAssetsNetExcludingGoodwill9.432.330.531.433.335.133.733.732.331.933.2
Percentage of Assets0.52.11.92.05.15.75.64.84.34.65.0
Percentage of Assets nov:CompletionAndProductionSolutions0.00.00.00.00.00.00.00.00.00.00.0

nov:RigTechnologies



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312017-12-312016-12-31
Value242251256268280258275
Percentage of IntangibleAssetsNetExcludingGoodwill45.329.529.629.89.37.87.8
Percentage of Assets2.31.91.81.91.41.31.3
Percentage of Assets nov:RigTechnologies0.00.00.00.00.00.00.0

nov:WellboreTechnologies



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value2423263463491735188320642254266629992942
Percentage of IntangibleAssetsNetExcludingGoodwill45.338.340.038.857.557.058.558.660.059.362.0
Percentage of Assets2.32.52.52.48.89.39.88.47.98.69.3
Percentage of Assets nov:WellboreTechnologies0.00.00.00.00.00.00.00.00.00.00.0

Deferred Tax Assets Liabilities Net

Other Assets Noncurrent

us-gaap:OtherAssetsNoncurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value696763129126124131126141137156151131124135147132156170182191190125113123115124108138140116879778375762556143597273
Percentage of OtherAssetsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.60.50.40.90.60.60.70.60.70.70.70.70.60.60.60.60.50.60.60.60.60.60.40.30.30.30.40.30.40.40.40.30.40.30.20.20.30.20.30.20.30.30.3

Liabilities Current

us-gaap:LiabilitiesCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value2163224722762221210323412276219421322354284228512852304726152947343542495193567266677374720169157098667863175619554656495681648154455416474442504132453638723937374441745623
Percentage of LiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets20.217.116.315.510.511.811.411.110.711.713.613.613.614.411.812.413.915.917.518.220.622.021.020.420.019.218.216.716.517.919.823.320.721.219.317.917.819.717.418.217.419.426.2

Debt Current

Accounts Payable Current

us-gaap:AccountsPayableCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value662715716695679722675616528510447448388414396434467623731847988118912591178139112751312123212831200136512651009901802745656628585598538584852
Percentage of AccountsPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets6.25.45.14.83.43.63.43.12.62.52.12.11.92.01.81.81.92.32.52.73.03.53.73.53.93.73.83.73.83.84.84.53.83.53.33.12.82.72.62.82.52.74.0

Other Accrued Liabilities Current

us-gaap:OtherAccruedLiabilitiesCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value214236347335250282258253244309318318288348286304291294298329320324351385396357466465484433444419395419307282267328269244200
Percentage of OtherAccruedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.01.82.52.31.21.41.31.31.21.51.51.51.41.61.31.31.21.11.01.11.01.01.01.11.11.01.31.41.41.41.51.51.51.61.31.21.21.41.21.10.9

Accrued Income Taxes Current

us-gaap:AccruedIncomeTaxesCurrent



Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value284292166113581577183119357419926411224432431267260484556260248406355194207649709399178284468351233124226230
Percentage of AccruedIncomeTaxesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.30.30.10.10.30.10.20.40.30.30.40.60.20.30.81.00.40.11.31.30.80.81.41.60.70.71.21.10.70.72.52.81.60.71.22.01.61.10.61.01.1

Long Term Debt

Long Term Debt Noncurrent

us-gaap:LongTermDebtNoncurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value2002198924842483248327042706270727072706270727082707270832103268337239283981415440943014299531483149314937494120434931481175159159159510511512514516519724876870
Percentage of LongTermDebtNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets18.715.117.717.312.413.713.613.713.513.412.913.012.912.814.513.713.614.713.413.312.69.08.79.38.99.010.812.313.010.04.10.60.60.62.12.22.22.22.32.43.44.14.1

Deferred Tax Liabilities Noncurrent

us-gaap:DeferredTaxLiabilitiesNoncurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value691401741775655646726666856779259991043106411551103123918051826197620141972208820022088229224432458254319971802193518471852177618151832188521972091216620912134
Percentage of DeferredTaxLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.61.11.21.22.82.83.43.43.43.44.44.85.05.05.24.65.06.86.26.36.25.96.15.95.96.67.07.37.66.36.37.07.07.37.27.67.98.29.99.710.19.79.9

Minority Interest

us-gaap:MinorityInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value68687276757070686966676964637068787780788580968695100989213011710911110410910511511211411810911311596
Percentage of MinorityInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.60.50.50.50.40.40.40.30.30.30.30.30.30.30.30.30.30.30.30.20.30.20.30.30.30.30.30.30.40.40.40.40.40.40.40.50.50.50.50.50.50.50.4

Other Liabilities Noncurrent

us-gaap:OtherLiabilitiesNoncurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value256253269285283298263223335309309307317318326280275283422418527430367344353363439445439334321327316360275275279253242264252163128
Percentage of OtherLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.41.91.92.01.41.51.31.11.71.51.51.51.51.51.51.21.11.11.41.31.61.31.11.01.01.01.31.31.31.11.11.21.21.41.11.21.21.11.11.21.20.80.6

Stockholders Equity

us-gaap:StockholdersEquity



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value5486777880578411137651381913906139001408214094140841395313921139401481816118163551638318126189271903720692215232133222697222302162720859205492023919574188201841617619171341679016289157481528614728144671411312628
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets51.359.257.558.668.869.869.970.470.469.867.366.866.665.966.867.866.161.361.260.658.761.762.863.164.063.962.462.161.264.368.367.670.169.169.870.770.368.368.868.067.465.558.8

Common Stock Value

Retained Earnings Accumulated Deficit

us-gaap:RetainedEarningsAccumulatedDeficit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value-13816901094135867666862686968886883696669997044713872858018939996359927133981341713306131811278212281138011332312776122511183111385107731021296589103858080957661730069066544618558054796
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-12.95.27.89.533.834.734.534.934.434.533.433.734.134.536.139.538.937.145.243.041.039.337.336.338.938.336.836.535.336.237.636.736.735.735.034.133.131.731.130.228.827.022.3

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value-1655-1423-1524-1392-1413-1437-1328-1298-1061-1110-1109-1258-1356-1452-1283-1325-1308-1553-1477-1119-1318-834-36248-41-41-201-5810779-69104-233722519291109-675090-161195
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-15.5-10.8-10.9-9.7-7.1-7.3-6.7-6.6-5.3-5.5-5.3-6.0-6.5-6.9-5.8-5.6-5.3-5.8-5.0-3.6-4.1-2.5-1.10.1-0.1-0.00.0-0.6-0.20.30.3-0.20.4-0.10.20.90.80.40.5-0.30.20.4-0.70.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value39473352-73-38221190239-1293212321681111535812862161441019411473651987148815181009364506800137-253-64622634912-2580745318795126684500785
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.120.716.6-3.4-2.09.28.811.3-7.216.312.69.66.49.03.57.428.422.612.45.02.412.99.316.68.424.617.46.59.514.12.6-5.3-1.514.617.026.0-0.825.415.06.43.14.022.216.622.6

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value-53-47-112-49-107-65-32-299-61-61-36-106-42-211-83-91-103-136-106-123-149-307-143-528-126-152-148-129-2535-765-413-2090-160-882-152-301-123-573-62-43-65-233205-445-79
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-2.8-2.1-5.3-2.3-5.5-2.7-1.5-14.2-3.4-3.1-2.0-6.0-2.4-12.5-5.0-5.3-4.7-5.0-3.2-3.1-3.1-5.4-2.6-10.0-2.2-2.5-2.6-2.3-47.8-13.5-7.8-44.1-3.7-20.7-4.1-8.6-3.9-18.1-2.1-1.5-2.1-7.46.6-14.8-2.3

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value-43-574-34-19-20-188-2-18-543-21-18-13-25-126-129-861-224-942-561-436-950-130-158-105-668-465-334116215785089758-66-20-234-14421-41-46-36-4668-341
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-2.3-25.2-1.6-0.9-1.0-0.80.4-0.1-1.0-27.6-1.1-1.0-0.7-1.5-7.7-7.5-39.3-8.2-28.5-14.4-9.0-16.6-2.3-3.0-1.8-10.8-8.0-6.021.927.80.918.91.3-1.5-0.5-6.7-4.60.7-1.4-1.6-1.2-14.90.3-1.10.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value39473352-73-38221190239-1293212321681111535812862161441019411473651987148815181009364506800137-253-64622634912-2580745318795126684500785
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.120.716.6-3.4-2.09.28.811.3-7.216.312.69.66.49.03.57.428.422.612.45.02.412.99.316.68.424.617.46.59.514.12.6-5.3-1.514.617.026.0-0.825.415.06.43.14.022.216.622.6

Net Income Loss

us-gaap:NetIncomeLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value-2047-385-244-5389-7712124-68-14-26-26-75-122-714-1362-217-119-1523155289310595699619619589658636531502668612605606574532481407440404401422394385220470
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-108.7-16.9-11.5-252.8-4.00.50.01.1-3.8-0.7-1.4-1.4-4.3-7.0-42.2-82.7-12.6-5.4-56.04.77.46.410.412.511.811.810.210.711.09.59.511.811.512.814.113.514.213.712.913.913.413.613.912.612.57.313.5

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value45321-18-1-3117-5
Percentage of NetIncomeLoss-0.2-1.3-1.2-0.0-1.3-8.3800.0-4.24.4-7.1-3.8-9.34.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.20.20.10.10.1-0.00.4-0.0-0.20.10.10.4-0.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome0.00.00.0200.00.0-50.0800.00.0300.0-50.0-50.0700.0100.0

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedGainLossNetCashFlowHedgeParent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-06-30
Value4632102-17
Percentage of NetIncomeLoss-0.2-1.6-1.2-0.0-1.30.0200.0-4.2-9.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.20.30.10.10.10.00.1-0.00.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.00.00.0200.00.00.0200.00.0700.0

Profit Loss

us-gaap:ProfitLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value-2049-385-249-5384-7515425-66-15-27-27-74-120-717-1364-217-118-1522156286313597701620620589661636531500668609602604573528480404437404399419391387222473
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-108.8-16.9-11.7-252.5-3.90.60.21.2-3.7-0.8-1.5-1.5-4.2-6.9-42.4-82.9-12.6-5.4-55.94.77.36.510.512.511.811.810.210.711.09.59.411.811.412.714.013.514.113.712.813.813.413.613.812.512.57.413.6

us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterest



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-2-552312
Percentage of ProfitLoss0.12.0-0.1-2.775.04.0-3.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.1-0.20.20.10.10.00.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:NoncontrollingInterest0.00.00.00.00.00.00.0

us-gaap:Parent



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-2047-244-5389-77124-68
Percentage of ProfitLoss99.998.0100.1102.725.096.0103.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-108.7-11.5-252.8-4.00.01.1-3.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:Parent0.00.00.00.00.00.00.0

us-gaap:RetainedEarnings



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-2047-244-5389-77124-68
Percentage of ProfitLoss99.998.0100.1102.725.096.0103.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-108.7-11.5-252.8-4.00.01.1-3.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.0

Increase Decrease In Other Operating Capital Net

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value105-731329-122433176-141-1674139-841-1154-127-669291229216-70-283-241115121-287-147246-233-1-40272-374-147-96231202-21832-104358-5353182
Percentage of IncreaseDecreaseInOtherOperatingCapitalNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Increase Decrease In Inventories

us-gaap:IncreaseDecreaseInInventories



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value-47-273-2441152-186434146-12619-57-65-352-110-208-112-416-18666126-10730142690-44334013-9136729349261167163200-140130-9667571-28-36-39
Percentage of IncreaseDecreaseInInventories100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value-53-47-112-49-107-65-32-299-61-61-36-106-42-211-83-91-103-136-106-123-149-307-143-528-126-152-148-129-2535-765-413-2090-160-882-152-301-123-573-62-43-65-233205-445-79
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-2.8-2.1-5.3-2.3-5.5-2.7-1.5-14.2-3.4-3.1-2.0-6.0-2.4-12.5-5.0-5.3-4.7-5.0-3.2-3.1-3.1-5.4-2.6-10.0-2.2-2.5-2.6-2.3-47.8-13.5-7.8-44.1-3.7-20.7-4.1-8.6-3.9-18.1-2.1-1.5-2.1-7.46.6-14.8-2.3

Payments To Acquire Property Plant And Equipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value686769544371716339654243426360778412198104130231168169131185164152168201129140113166125113799262473164436479
Percentage of PaymentsToAcquirePropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value-43-574-34-19-20-188-2-18-543-21-18-13-25-126-129-861-224-942-561-436-950-130-158-105-668-465-334116215785089758-66-20-234-14421-41-46-36-4668-341
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-2.3-25.2-1.6-0.9-1.0-0.80.4-0.1-1.0-27.6-1.1-1.0-0.7-1.5-7.7-7.5-39.3-8.2-28.5-14.4-9.0-16.6-2.3-3.0-1.8-10.8-8.0-6.021.927.80.918.91.3-1.5-0.5-6.7-4.60.7-1.4-1.6-1.2-14.90.3-1.10.0

Proceeds From Issuance Of Long Term Debt

Repayments Of Long Term Debt

Payments For Repurchase Of Common Stock

Repayments Of Long Term Debt

Debt Instrument Interest Rate Stated Percentage

us-gaap:DebtInstrument

us-gaap:DebtInstrumentInterestRateStatedPercentage

nov:ThreePointSixZeroPercentUnsecuredSeniorNotesDueTwoThousandAndTwentyNine



Period End2019-11-04
Value0.036
Percentage of DebtInstrumentInterestRateStatedPercentage100.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations nov:ThreePointSixZeroPercentUnsecuredSeniorNotesDueTwoThousandAndTwentyNine0.0

nov:TwoPointSixZeroUnsecuredSeniorNotesDueTwoThousandAndTwentyTwo



Period End2019-12-04
Value0.026
Percentage of DebtInstrumentInterestRateStatedPercentage0.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations nov:TwoPointSixZeroUnsecuredSeniorNotesDueTwoThousandAndTwentyTwo0.0

Effective Income Tax Rate Continuing Operations

us-gaap:EffectiveIncomeTaxRateContinuingOperations



Period End2020-03-312019-06-302019-03-312018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-09-302014-06-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-312009-09-302009-06-30
Value0.0710.0650.1180.167-0.0480.293000000000000040.10.1590.070.013999999999999999-0.0960.3580.5-0.6060.1880.2690.3760.2880.3180.3180.3060.3080.310.3090.3030.3210.3080.3230.0320.3190.2950.3180.320.3320.371
Percentage of EffectiveIncomeTaxRateContinuingOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-312007-12-31
Value21212217151010910111077
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-312007-12-31
Value47.6848.8848.9954.0859.561.2263.2958.6947.238.0134.1937.2429.12
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period

us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod

nov:RestrictedStockAndRestrictedStockUnits



Period End2020-02-252019-02-272019-02-272018-05-112018-02-282017-02-222016-02-242015-02-25
Value22202110
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod100.0100.0100.0100.0100.0100.0100.0

us-gaap:Range, us-gaap:TitleOfIndividual, us-gaap:AwardType

srt:Maximum, nov:SeniorManagementEmployees, nov:PerformanceBaseRestrictedStock



Period End2020-02-252019-02-27
Value10
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod41.923.0

Share Based Compensation

Deferred Tax Liabilities

us-gaap:DeferredTaxLiabilities



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-31
Value14055366497812321331185923302066233620912134
Percentage of DeferredTaxLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Assets Net

us-gaap:DeferredTaxAssetsNet



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-31
Value321413446772864950-745762603657382397
Percentage of DeferredTaxAssetsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Unrecognized Tax Benefits

us-gaap:UnrecognizedTaxBenefits



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-312011-12-312011-03-312010-12-312010-09-302010-06-302009-12-312008-12-312007-12-31
Value38981327846113125185115128128127127128128128131117118121117586147
Percentage of UnrecognizedTaxBenefits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Assets Valuation Allowance

us-gaap:DeferredTaxAssetsValuationAllowance



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-31
Value117595512025446348-13393139810
Percentage of DeferredTaxAssetsValuationAllowance100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions

Operating Lease Right Of Use Asset

us-gaap:OperatingLeaseRightOfUseAsset



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312019-01-01
Value399444437452542537
Percentage of OperatingLeaseRightOfUseAsset100.0100.0100.0100.0100.0100.0

Cash And Cash Equivalents Period Increase Decrease

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-312015-12-31
Value11151171131311211270142712931137123614371722153014082080
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

nov:GoodwillAndIndefiniteLivedIntangibleAssetImpairment



Period End2020-03-312019-12-312019-09-302019-06-30
Value137842603186
Percentage of GoodwillAndIndefiniteLivedIntangibleAssetImpairment100.0100.00.0100.0

nov:IntangibleAssetsAcquiredDuringPeriod



Period End2019-12-312019-09-30
Value11-3
Percentage of IntangibleAssetsAcquiredDuringPeriod100.0100.0

us-gaap:StatementBusinessSegments

nov:WellboreTechnologies



Period End2019-12-312019-09-30
Value0-3
Percentage of IntangibleAssetsAcquiredDuringPeriod0.0100.0

nov:IntangibleAssetsTranslationAndPurchaseAccountingAdjustments



Period End2020-03-312019-12-312019-09-30
Value-96-14
Percentage of IntangibleAssetsTranslationAndPurchaseAccountingAdjustments100.0100.0100.0

us-gaap:StatementBusinessSegments

nov:CompletionAndProductionSolutions



Period End2020-03-31
Value-5
Percentage of IntangibleAssetsTranslationAndPurchaseAccountingAdjustments55.6

nov:RigTechnologies



Period End2020-03-312019-12-312019-09-30
Value-21-4
Percentage of IntangibleAssetsTranslationAndPurchaseAccountingAdjustments22.216.728.6

nov:WellboreTechnologies



Period End2020-03-312019-12-312019-09-30
Value-203
Percentage of IntangibleAssetsTranslationAndPurchaseAccountingAdjustments22.20.0-21.4

nov:PercentageAsOfOperatingProfitToRevenue



Period End2020-03-312019-03-312018-09-302018-06-302018-03-312017-09-302017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-312009-09-302009-06-30
Value-1.036-0.0250.0340.025-0.001-0.004-0.004-0.035-0.056-0.721-0.157-0.0860.0710.1120.1180.1770.1740.1740.1490.1630.1370.1420.1690.1860.2040.2060.2020.1940.1980.2010.210.1950.128
Percentage of PercentageAsOfOperatingProfitToRevenue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, nov:CompletionAndProductionSolutions



Period End2020-03-312019-03-312018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-06-302014-03-312013-09-302013-06-30
Value-1.501-0.060.0540.0240.0650.0410.012-0.112-0.061-0.0680.0040.0890.0830.1550.1390.1390.1370.160.12
Percentage of PercentageAsOfOperatingProfitToRevenue144.9240.0216.0-2400.0-1625.0-117.1-21.415.538.979.15.679.570.387.679.991.998.287.6

us-gaap:OperatingSegments, nov:RigTechnologies



Period End2020-03-312019-03-312018-06-302017-06-30
Value-0.3630.0510.0950.011
Percentage of PercentageAsOfOperatingProfitToRevenue35.0-204.0380.0-31.4

us-gaap:OperatingSegments, nov:WellboreTechnologies



Period End2020-03-312019-03-312018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-06-302014-03-312013-09-302013-06-30
Value-0.9590.0240.0480.0170.0-0.039-0.103-0.179-0.286-0.144-0.0080.040.0670.1890.1820.1820.1730.2190.151
Percentage of PercentageAsOfOperatingProfitToRevenue92.6-96.0192.0-1700.0-0.0111.4183.924.8182.2167.4-11.335.756.8106.8104.6116.1134.4110.2

nov:PropertyPlantAndEquipmentAndRightOfUseAssetsImpairmenCharge



Period End2020-03-31
Value304
Percentage of PropertyPlantAndEquipmentAndRightOfUseAssetsImpairmenCharge100.0

us-gaap:StatementBusinessSegments

nov:CompletionAndProductionSolutions



Period End2020-03-31
Value221
Percentage of PropertyPlantAndEquipmentAndRightOfUseAssetsImpairmenCharge72.7

nov:RigTechnologies



Period End2020-03-31
Value12
Percentage of PropertyPlantAndEquipmentAndRightOfUseAssetsImpairmenCharge3.9

nov:WellboreTechnologies



Period End2020-03-31
Value71
Percentage of PropertyPlantAndEquipmentAndRightOfUseAssetsImpairmenCharge23.4

nov:ProvisionForInventoryLosses



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value125672653131489
Percentage of ProvisionForInventoryLosses100.0100.0100.0100.0100.0100.0100.0

nov:WithholdingTaxes



Period End2020-03-312019-03-31
Value-17-18
Percentage of WithholdingTaxes100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-03-31
Value-17-18
Percentage of WithholdingTaxes100.0100.0

us-gaap:Parent



Period End2020-03-312019-03-31
Value-17-18
Percentage of WithholdingTaxes100.0100.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value27413212263019
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value27413212263019
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0

us-gaap:Parent



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value27413212263019
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0

us-gaap:AllocatedShareBasedCompensationExpense



Period End2019-12-312019-09-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-30
Value26412230312739333322302928212926212240262327272725252517232322121819191716171617221515
Percentage of AllocatedShareBasedCompensationExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PlanName

nov:TwoThousandEighteenLongTermIncentivePlan



Period End2020-03-312019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value27303330312733
Percentage of AllocatedShareBasedCompensationExpense0.00.00.0100.0100.0100.0100.0

us-gaap:AmortizationOfIntangibleAssets



Period End2020-03-312019-12-312019-09-30
Value171517
Percentage of AmortizationOfIntangibleAssets100.0100.0100.0

us-gaap:StatementBusinessSegments

nov:CompletionAndProductionSolutions



Period End2020-03-312019-12-312019-09-30
Value656
Percentage of AmortizationOfIntangibleAssets35.333.335.3

nov:RigTechnologies



Period End2020-03-312019-12-312019-09-30
Value768
Percentage of AmortizationOfIntangibleAssets41.240.047.1

nov:WellboreTechnologies



Period End2020-03-312019-12-312019-09-30
Value443
Percentage of AmortizationOfIntangibleAssets23.526.717.6

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-232011-06-302011-03-312010-09-302010-06-302009-09-302009-06-30
Value2725252111181917171813141415151414699107774562236644
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value-56-142192-149-157134156-99-201-285192
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CommonStockDividendsPerShareCashPaid



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-31
Value0.050.050.050.050.050.050.050.050.050.050.050.050.050.050.050.050.050.460.460.460.460.460.460.460.460.460.260.260.260.260.130.130.120.120.120.120.110.110.110.110.10.10.11.1
Percentage of CommonStockDividendsPerShareCashPaid100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ContractWithCustomerPerformanceObligationSatisfiedInPreviousPeriod



Period End2019-12-312019-09-302018-12-312018-09-30
Value82099
Percentage of ContractWithCustomerPerformanceObligationSatisfiedInPreviousPeriod100.0100.0100.0100.0

us-gaap:CreditFacility

us-gaap:DebtInstrumentBasisSpreadOnVariableRate1

us-gaap:ForeignLineOfCredit



Period End2020-03-31
Value0.014
Percentage of DebtInstrumentBasisSpreadOnVariableRate1100.0

us-gaap:VariableRate

nov:CanadianDollarOfferedRateCDOR



Period End2020-03-31
Value0.01125
Percentage of DebtInstrumentBasisSpreadOnVariableRate180.4

us-gaap:DeferredIncomeTaxesAndTaxCredits



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-62-592-360-9-78-2125-357-31541872-153-135-136-14833-7-26421-9538-24224-82-33-137-11-68119-173-170-10495-78-2-17085
Percentage of DeferredIncomeTaxesAndTaxCredits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DepreciationAndAmortization



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value105100102154177171172174173175174174175174176178175183184190190199198186195200191190174166157157148142140138135129127124127126126122116
Percentage of DepreciationAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-30
Value-43-2-7-7413-3-19-110-1423-11712
Percentage of DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0

us-gaap:DividendsCommonStockCash



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-06-30
Value1919201919191919191919191919191919173173174178185196198198111111111111565651515151474746464242424600
Percentage of DividendsCommonStockCash100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:StatementEquityComponents

us-gaap:Parent



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value19201919191919
Percentage of DividendsCommonStockCash100.0100.0100.0100.0100.0100.0100.0

us-gaap:RetainedEarnings



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value19201919191919
Percentage of DividendsCommonStockCash100.0100.0100.0100.0100.0100.0100.0

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents



Period End2020-03-312019-12-312019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value168-4-10-377-217
Percentage of EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense



Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-30
Value0154464269954135578767127987885768306655555457
Percentage of EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense0.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinanceLeasePrincipalPayments



Period End2019-12-312019-09-302019-06-30
Value1078
Percentage of FinanceLeasePrincipalPayments100.0100.0100.0

us-gaap:DebtInstrument

us-gaap:GainsLossesOnExtinguishmentOfDebt

nov:TwoPointSixZeroUnsecuredSeniorNotesDueTwoThousandAndTwentyTwo



Period End2019-12-04
Value-26
Percentage of GainsLossesOnExtinguishmentOfDebt100.0

us-gaap:GoodwillAcquiredDuringPeriod



Period End2020-03-312019-09-30
Value455
Percentage of GoodwillAcquiredDuringPeriod100.0100.0

us-gaap:StatementBusinessSegments

nov:WellboreTechnologies



Period End2020-03-31
Value4
Percentage of GoodwillAcquiredDuringPeriod100.0

us-gaap:GoodwillForeignCurrencyTranslationGainLoss



Period End2020-03-312019-12-312019-09-30
Value12-25
Percentage of GoodwillForeignCurrencyTranslationGainLoss100.0100.0100.0

us-gaap:StatementBusinessSegments

nov:CompletionAndProductionSolutions



Period End2020-03-312019-12-312019-09-30
Value10-17
Percentage of GoodwillForeignCurrencyTranslationGainLoss100.00.068.0

nov:RigTechnologies



Period End2019-12-31
Value2
Percentage of GoodwillForeignCurrencyTranslationGainLoss100.0

nov:WellboreTechnologies



Period End2019-12-312019-09-30
Value0-3
Percentage of GoodwillForeignCurrencyTranslationGainLoss0.012.0

us-gaap:GoodwillImpairmentLoss



Period End2020-03-312019-12-312019-09-302019-06-302016-12-312016-09-30
Value1295410030990972
Percentage of GoodwillImpairmentLoss100.0100.00.0100.00.0100.0

us-gaap:StatementBusinessSegments

nov:CompletionAndProductionSolutions



Period End2020-03-312019-12-312019-09-30
Value58060
Percentage of GoodwillImpairmentLoss44.81.50.0

nov:RigTechnologies



Period End2020-03-312019-12-312019-09-30
Value198920
Percentage of GoodwillImpairmentLoss15.322.40.0

nov:WellboreTechnologies



Period End2020-03-312019-12-312019-09-302015-12-31
Value51731201485
Percentage of GoodwillImpairmentLoss39.976.10.00.0

us-gaap:ImpairmentOfIntangibleAssetsExcludingGoodwill



Period End2020-03-312019-12-312019-09-30
Value292160
Percentage of ImpairmentOfIntangibleAssetsExcludingGoodwill100.0100.00.0

us-gaap:StatementBusinessSegments

nov:CompletionAndProductionSolutions



Period End2020-03-312019-12-312019-09-30
Value21400
Percentage of ImpairmentOfIntangibleAssetsExcludingGoodwill73.30.00.0

nov:WellboreTechnologies



Period End2020-03-312019-12-312019-09-30
Value78160
Percentage of ImpairmentOfIntangibleAssetsExcludingGoodwill26.7100.00.0

us-gaap:ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill



Period End2019-12-312019-06-302009-06-30
Value1687147
Percentage of ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill100.0100.0100.0

us-gaap:ImpairmentOfLongLivedAssetsHeldForUse



Period End2020-03-312019-12-312019-09-302019-06-30
Value51310122187
Percentage of ImpairmentOfLongLivedAssetsHeldForUse100.0100.0100.0100.0

us-gaap:IncomeLossFromEquityMethodInvestments



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-09-302017-06-302016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value-233-7-4-2-2-2-1-1-2-2-2-2-6-7-6-30791692323101613151915719171211101314886211628
Percentage of IncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInAccountsPayable



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value-5411316-494464741450-163-26-13-40-33-157-110-117-142-201-9185-15116-3784-30-8-1845851025958731539-1259-4623-232-1553
Percentage of IncreaseDecreaseInAccountsPayable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInAccountsReceivable



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value2763-194182-32610950-16679-59-22110-101244-231-152-706-46-138-538-369-4878-295418104393204-20826689122405026758321-4933131742012-389-817227
Percentage of IncreaseDecreaseInAccountsReceivable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInAccruedIncomeTaxesPayable



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302011-12-312011-09-30
Value-15338-21-4566-10-25-4628-18-13-4183-39-125-6515188-40711656-223-7230412-15651160-12303225
Percentage of IncreaseDecreaseInAccruedIncomeTaxesPayable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInAccruedLiabilities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value-142-12-1062-2345374-34-279-8046-35-61-109-150-283-231-421-218-274-224
Percentage of IncreaseDecreaseInAccruedLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInContractWithCustomerAsset



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value5282246-26803731-80-23-82
Percentage of IncreaseDecreaseInContractWithCustomerAsset100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInContractWithCustomerLiability



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value43-27-443-46-112-391277-8-49
Percentage of IncreaseDecreaseInContractWithCustomerLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value-9-420254-64-331020-35-13-66-16-7139-8111-39-32-7-34-1325-85133-4842106-130-30866999-34-325951-309-713-9914234-126
Percentage of IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestPaidNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value332123654224334634534535034674464544674775071996610418121810171119101710
Percentage of InterestPaidNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InvestmentIncomeInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value3446676576111144433552255455442332233554444321422
Percentage of InvestmentIncomeInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoptionQuantification



Period End2020-03-312018-03-31
Value-54
Percentage of NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoptionQuantification100.0100.0

us-gaap:StatementEquityComponents

us-gaap:Parent



Period End2020-03-312018-03-31
Value-54
Percentage of NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoptionQuantification100.0100.0

us-gaap:RetainedEarnings



Period End2020-03-312018-03-31
Value-54
Percentage of NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoptionQuantification100.0100.0

us-gaap:NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance



Period End2020-03-312019-03-312018-03-31
Value233
Percentage of NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterest



Period End2020-03-312019-03-312018-03-31
Value233
Percentage of NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance100.0100.0100.0

us-gaap:OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-312009-09-302009-06-30
Value-18073-1181820-79-32-22336-181241247690-176-18-46143-114-339107-418-284-310114114-51-31154-121-1173684-12165-40-117286492-62-1422112
Percentage of OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax

us-gaap:AccumulatedDefinedBenefitPlansAdjustment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312017-03-312015-12-312015-09-30
Value0120001260
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax0.0100.00.00.00.0100.0100.00.0

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-5611-1713-220
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax0.091.70.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome



Period End2020-03-312018-12-312018-09-302018-06-302018-03-31
Value-236-108-38-23652
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax0.00.00.00.00.0

us-gaap:AccumulatedTranslationAdjustment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value-18073-1181820-73-38-22336-181247690-176-18-46143-114-339107-418-295-311114-51-31154
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax0.0608.30.00.00.00.00.00.00.00.00.00.09000.00.00.00.00.0-438.50.00.00.00.00.00.00.00.00.0

us-gaap:OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value-5217-1434-222-1413-72525235-25602910216-1992-66-123-99-25-2514-1548-22-48-17364-536392-715
Percentage of OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value24112054-28861-7201240653421-47-38-1010681781912232225-3728-2
Percentage of OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossNetOfTax



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-232-1322124-30-23749
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-232-1322124-30-23749
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0

us-gaap:Parent



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-232-1322124-30-23749
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherNoncashIncomeExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302011-12-312011-09-302010-12-312010-09-30
Value-45109-50-40-35136-55-55-19121-51-35-55173-86-112-83-20-74-71-91-1-53-66-619-56-19-18-8-331-37-19-111
Percentage of OtherNoncashIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsForProceedsFromOtherInvestingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-15-20-72-5-1-6-39-8-14-5-9-13-6-22-1-1-2-1-18-2-4-34-104-6-7-3-23-38-8-11-7-6-11-7-29-7-7-6-7-4-12
Percentage of PaymentsForProceedsFromOtherInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsOfDividendsCommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1919201919191919191919191919191917317317417818519619819811111111111156565151515147474646424242
Percentage of PaymentsOfDividendsCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsToAcquireBusinessesNetOfCashAcquired



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-30
Value011506500244361376617024152116262123110791002071523755752911956587235620851487716461813
Percentage of PaymentsToAcquireBusinessesNetOfCashAcquired0.0100.00.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-312009-09-302009-06-302009-03-31
Value-242-140-1923211-8-1211-124-9-5-12-3-11-3102-104013-144522100214338201
Percentage of ProceedsFromPaymentsForOtherFinancingActivities100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0

us-gaap:StatementEquityComponents

us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax

us-gaap:AccumulatedDefinedBenefitPlansAdjustment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312015-12-312015-09-30
Value0100040
Percentage of ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax0.0100.00.00.00.0100.00.0

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-4-6-3-2-10-2
Percentage of ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax0.0-600.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome



Period End2020-03-312018-12-312018-09-302018-06-302018-03-31
Value-41-813
Percentage of ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax0.00.00.00.00.0

us-gaap:AccumulatedTranslationAdjustment



Period End2020-03-312019-09-302019-06-302019-03-312018-12-312013-12-312013-09-30
Value00000500
Percentage of ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax0.00.00.00.00.00.00.0

us-gaap:RestructuringCharges



Period End2020-03-312019-06-302019-03-31
Value2023576911
Percentage of RestructuringCharges100.0100.0100.0

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, nov:CompletionAndProductionSolutions



Period End2020-03-312019-09-302019-06-302019-03-312018-09-30
Value1054791939110
Percentage of RestructuringCharges52.10.033.6100.00.0

us-gaap:OperatingSegments, nov:RigTechnologies



Period End2020-03-312019-09-302019-06-302019-03-312018-09-30
Value23819447420
Percentage of RestructuringCharges11.80.08.218.20.0

us-gaap:OperatingSegments, nov:WellboreTechnologies



Period End2020-03-312019-09-302019-06-302019-03-312018-09-30
Value715413345-20
Percentage of RestructuringCharges35.30.058.0-18.20.0

us-gaap:OperatingSegments, us-gaap:IntersegmentElimination



Period End2020-03-31
Value16
Percentage of RestructuringCharges0.8

us-gaap:RestructuringCostAndReserve

nov:GoodwillIndefiniteLivedAndFiniteLivedIntangibleAndLongLivedTangibleAssets



Period End2020-03-312019-06-30
Value18915373
Percentage of RestructuringCharges93.593.1

nov:InventoryCharges



Period End2020-03-312019-09-302019-06-302019-03-31
Value11426530211
Percentage of RestructuringCharges5.60.05.2100.0

nov:SeveranceFacilityClosuresAndOtherItems



Period End2020-03-312019-09-302019-06-302019-03-31
Value1837511
Percentage of RestructuringCharges0.90.00.1100.0

us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodSharesNewIssues

us-gaap:CommonStock



Period End2020-03-312019-03-312018-03-31
Value232
Percentage of StockIssuedDuringPeriodSharesNewIssues100.0100.0100.0

us-gaap:StockIssuedDuringPeriodValueNewIssues



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value111629203
Percentage of StockIssuedDuringPeriodValueNewIssues100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value111629203
Percentage of StockIssuedDuringPeriodValueNewIssues100.0100.0100.0100.0100.0100.0100.0

us-gaap:Parent



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value111629203
Percentage of StockIssuedDuringPeriodValueNewIssues100.0100.0100.0100.0100.0100.0100.0

nov:AccruedPurchaseOrders



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value130121117135119127128137142150202221236235280278432449773880886815840538562531648633493444407428439280405522601597869947853
Percentage of AccruedPurchaseOrders100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

nov:DeferredTaxAssetsAllowancesAndOperatingLiabilities



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-31
Value395293355534491542-439368331344343364
Percentage of DeferredTaxAssetsAllowancesAndOperatingLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

nov:DeferredTaxLiabilitiesTaxAccruedLiabilities



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value3317175355107929270
Percentage of DeferredTaxLiabilitiesTaxAccruedLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0

nov:DeferredTaxLiabilitiesTaxOverBookDepreciation



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value115139174267277236306268204
Percentage of DeferredTaxLiabilitiesTaxOverBookDepreciation100.0100.0100.0100.0100.0100.0100.0100.0100.0

nov:LeaseLiabilitiesCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value1151141131161157
Percentage of LeaseLiabilitiesCurrent100.0100.0100.0100.0100.0100.0

nov:LeaseLiabilitiesNonCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value646674673696728222
Percentage of LeaseLiabilitiesNonCurrent100.0100.0100.0100.0100.0100.0

nov:OperatingLossCarryforwardTaxEffected



Period End2019-12-312018-12-312017-12-312016-12-31
Value270182182153
Percentage of OperatingLossCarryforwardTaxEffected100.0100.0100.0100.0

us-gaap:IncomeTaxAuthority

us-gaap:DomesticCountry



Period End2019-12-312018-12-312017-12-312016-12-31
Value49758
Percentage of OperatingLossCarryforwardTaxEffected18.13.82.75.2

us-gaap:ForeignCountry



Period End2019-12-312018-12-312017-12-312016-12-31
Value212167169136
Percentage of OperatingLossCarryforwardTaxEffected78.591.892.988.9

us-gaap:StateAndLocalJurisdiction



Period End2019-12-312018-12-312017-12-312016-12-31
Value9889
Percentage of OperatingLossCarryforwardTaxEffected3.34.44.45.9

nov:OperatingLossCarryforwardsNetOfValuationAllowanceTaxEffected



Period End2019-12-312018-12-31
Value128
Percentage of OperatingLossCarryforwardsNetOfValuationAllowanceTaxEffected100.0100.0

us-gaap:IncomeTaxAuthority

us-gaap:ForeignCountry



Period End2019-12-312018-12-31
Value127
Percentage of OperatingLossCarryforwardsNetOfValuationAllowanceTaxEffected100.096.4

nov:PercentageOfInventoryReserve



Period End2019-12-312018-12-312017-12-31
Value0.2770.1770.21
Percentage of PercentageOfInventoryReserve100.0100.0100.0

us-gaap:AwardType

nov:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisableNumber

us-gaap:StockAppreciationRightsSARS



Period End2019-12-312018-12-312017-12-31
Value100
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisableNumber100.0100.0100.0

us-gaap:AwardType

nov:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisableWeightedAverageExercisePrice

us-gaap:StockAppreciationRightsSARS



Period End2019-12-312018-12-312017-12-31
Value28.428.5728.33
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisableWeightedAverageExercisePrice100.0100.0100.0

us-gaap:AccrualForTaxesOtherThanIncomeTaxesCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value74112101997712410397841521331421211761481281271751691581592111811761281881361251051501131028111989916893837395
Percentage of AccrualForTaxesOtherThanIncomeTaxesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccruedInsuranceCurrent



Period End2020-03-312019-12-312019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value53575455615572747792101103949711511311911513212614013213713112811910810811110510610370675049525658
Percentage of AccruedInsuranceCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccruedLiabilitiesCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value888949983955876108810239509651478154414891512156816281774205822842810302833003518331028572717276328572681246825712363242121722376215421791989210522892300224522672376
Percentage of AccruedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccruedSalesCommissionCurrent



Period End2020-03-312019-12-312019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-31
Value333134343841455855556157576073
Percentage of AccruedSalesCommissionCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AdditionalPaidInCapitalCommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value8518850784838441840883908361830682568234819081638135810380798040802480056201662570458341909989998933890788468805877287438718867386508535851384668432835382678247822882147989
Percentage of AdditionalPaidInCapitalCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value13216118720915912513212010710795
Percentage of AllowanceForDoubtfulAccountsReceivableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ContractWithCustomerAssetNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value639643615585539565483445415495
Percentage of ContractWithCustomerAssetNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ContractWithCustomerAssetNetCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value639643615585539565483445415495
Percentage of ContractWithCustomerAssetNetCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ContractWithCustomerLiability



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value470427455455412458570609598519
Percentage of ContractWithCustomerLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ContractWithCustomerLiabilityCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value470427455455412458570609598519
Percentage of ContractWithCustomerLiabilityCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrument

us-gaap:DebtInstrumentFaceAmount

nov:SeniorNotesDueOnDecemberOneTwoThousandTwentyTwo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-31
Value400400140014001400140014001400140014001400140014001400140014001400
Percentage of DebtInstrumentFaceAmount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredIncomeTaxLiabilities



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value4619661110175020962281260423302066
Percentage of DeferredIncomeTaxLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-31
Value270182182153170118-5125141076
Percentage of DeferredTaxAssetsOperatingLossCarryforwards100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsOther



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-31
Value6095781642115-39149151752822
Percentage of DeferredTaxAssetsOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsTaxCreditCarryforwards



Period End2019-12-312018-12-312017-12-312016-12-312015-12-31
Value7027681002405166
Percentage of DeferredTaxAssetsTaxCreditCarryforwards100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost



Period End2019-12-312018-12-31
Value6966
Percentage of DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost100.0100.0

us-gaap:DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-31
Value110688716114813231304175714481398130714131542
Percentage of DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxLiabilitiesOther



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-31
Value5252929720937716420816821198182
Percentage of DeferredTaxLiabilitiesOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxLiabilitiesTaxDeferredIncome



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-31
Value6570111185232257285314226456363215
Percentage of DeferredTaxLiabilitiesTaxDeferredIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAccumulatedBenefitObligation

us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-312016-12-31
Value597572630617
Percentage of DefinedBenefitPlanAccumulatedBenefitObligation100.0100.0100.0100.0

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanBenefitObligation

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-312016-12-312015-12-31
Value5345629290
Percentage of DefinedBenefitPlanBenefitObligation100.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-312016-12-312015-12-31
Value600575633622703
Percentage of DefinedBenefitPlanBenefitObligation1132.11277.81021.0676.1781.1

us-gaap:DefinedBenefitPlanFairValueOfPlanAssets



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value568517588543601660706517419203193
Percentage of DefinedBenefitPlanFairValueOfPlanAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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us-gaap:DebtSecurities



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value2272092842622593231721391005853
Percentage of DefinedBenefitPlanFairValueOfPlanAssets40.040.448.348.343.148.924.426.923.928.627.5

us-gaap:EquitySecurities



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value1571401611811861162962042126670
Percentage of DefinedBenefitPlanFairValueOfPlanAssets27.627.127.433.330.917.641.939.550.632.536.3

us-gaap:OtherContract



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value1841681431001562212381741075432
Percentage of DefinedBenefitPlanFairValueOfPlanAssets32.432.524.318.426.033.533.733.725.526.616.6

us-gaap:DefinedBenefitPlanByPlanAssetCategories, us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:DebtSecurities, us-gaap:FairValueInputsLevel2



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value227209284262259323172139100
Percentage of DefinedBenefitPlanFairValueOfPlanAssets40.040.448.348.343.148.924.426.923.9

us-gaap:EquitySecurities, us-gaap:FairValueInputsLevel2



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value157140161181186116296204212
Percentage of DefinedBenefitPlanFairValueOfPlanAssets27.627.127.433.330.917.641.939.550.6

us-gaap:OtherContract, us-gaap:FairValueInputsLevel2



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value1211138247571131317430
Percentage of DefinedBenefitPlanFairValueOfPlanAssets21.321.913.98.79.517.118.614.37.2

us-gaap:OtherContract, us-gaap:FairValueInputsLevel3



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value635561539910810710077
Percentage of DefinedBenefitPlanFairValueOfPlanAssets11.110.610.49.816.516.415.219.318.4

us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel2



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value505462527490502552599417342
Percentage of DefinedBenefitPlanFairValueOfPlanAssets88.989.489.690.283.583.684.880.781.6

us-gaap:FairValueInputsLevel3



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value63556153991081071007732
Percentage of DefinedBenefitPlanFairValueOfPlanAssets11.110.610.49.816.516.415.219.318.415.8

us-gaap:RetirementPlanType

us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-312016-12-312015-12-31
Value568517588543601
Percentage of DefinedBenefitPlanFairValueOfPlanAssets100.0100.0100.0100.0100.0

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanFundedStatusOfPlan

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-312016-12-31
Value-53-45-62-92
Percentage of DefinedBenefitPlanFundedStatusOfPlan100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-312016-12-31
Value-32-58-45-79
Percentage of DefinedBenefitPlanFundedStatusOfPlan60.4128.972.685.9

us-gaap:DerivativeFairValueOfDerivativeAsset



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value27185646182142334226806251433626395456533649685963344510581177826429590478459104
Percentage of DerivativeFairValueOfDerivativeAsset100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

us-gaap:OtherAssets, us-gaap:ForeignExchangeContract, us-gaap:DesignatedAsHedgingInstrument



Period End2020-03-312019-12-312018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302011-12-31
Value34311814616192186869135122824221
Percentage of DerivativeFairValueOfDerivativeAsset11.122.214.326.224.233.323.11.29.744.25.62.614.810.715.116.718.419.18.519.05.917.822.927.23.8

us-gaap:OtherAssets, us-gaap:ForeignExchangeContract, us-gaap:Nondesignated



Period End2020-03-312019-12-312019-09-302019-06-302018-06-302018-03-312017-12-312017-09-302016-06-302014-09-302014-06-302014-03-31
Value211112227011
Percentage of DerivativeFairValueOfDerivativeAsset7.45.620.016.74.84.86.14.816.30.02.01.5

us-gaap:PrepaidExpensesAndOtherCurrentAssets, us-gaap:ForeignExchangeContract, us-gaap:DesignatedAsHedgingInstrument



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value7531212231320832428555132321189183335361257
Percentage of DerivativeFairValueOfDerivativeAsset25.927.860.016.733.357.154.839.447.630.83.838.754.911.613.919.233.342.637.534.025.036.748.559.357.135.354.3

us-gaap:PrepaidExpensesAndOtherCurrentAssets, us-gaap:ForeignExchangeContract, us-gaap:Nondesignated



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value15814456106127632231229212523292721212119152024
Percentage of DerivativeFairValueOfDerivativeAsset55.644.420.066.766.723.814.330.314.346.295.051.645.127.980.680.864.142.651.850.958.342.930.932.223.858.822.9

us-gaap:HedgingDesignation

us-gaap:DesignatedAsHedgingInstrument



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value109312211153421341443028247514312726152746404814308164115117288240
Percentage of DerivativeFairValueOfDerivativeAsset37.050.060.016.750.033.361.171.481.063.681.053.85.048.454.955.819.419.235.957.448.249.141.755.167.667.876.241.266.777.179.064.765.465.466.786.385.1

us-gaap:Nondesignated



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value17925247681281276322319292125232927212222191520152417627914137
Percentage of DerivativeFairValueOfDerivativeAsset63.050.040.083.350.066.738.928.619.036.419.046.295.051.645.144.280.680.864.142.651.850.958.344.932.432.223.858.833.322.921.035.334.634.633.313.714.9

us-gaap:DerivativeFairValueOfDerivativeLiability



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value1182647233136161591110215577431091372863353415193991863824402674521934743396552023234312055
Percentage of DerivativeFairValueOfDerivativeLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

us-gaap:OtherLiabilities, us-gaap:ForeignExchangeContract, us-gaap:DesignatedAsHedgingInstrument



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312018-06-302017-12-312017-09-302017-06-302017-03-312016-12-312016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302011-12-31
Value212931122312114525645098102451339101551113
Percentage of DerivativeFairValueOfDerivativeLiability17.87.719.113.030.613.318.230.04.83.614.33.73.68.719.114.718.925.624.234.212.522.538.520.39.65.32.913.5

us-gaap:DerivativeInstrumentRisk, us-gaap:FinancialInstrument, us-gaap:HedgingDesignation

us-gaap:ForeignExchangeContract, us-gaap:AccruedLiabilities, us-gaap:DesignatedAsHedgingInstrument



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value6518291617
Percentage of DerivativeFairValueOfDerivativeLiability55.169.261.769.647.2

us-gaap:ForeignExchangeContract, us-gaap:AccruedLiabilities, us-gaap:Nondesignated



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value326946
Percentage of DerivativeFairValueOfDerivativeLiability27.123.119.117.416.7

us-gaap:HedgingDesignation

us-gaap:DesignatedAsHedgingInstrument



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value86203819232878355931482792112237255243373306142261127184729617502075451313
Percentage of DerivativeFairValueOfDerivativeLiability72.976.980.982.674.277.843.853.333.345.550.042.956.462.362.884.481.882.976.171.371.976.776.368.445.867.569.263.555.831.650.067.660.678.181.865.056.5

us-gaap:Nondesignated



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value326948897665122429161725498098146934412131382723131724132110710
Percentage of DerivativeFairValueOfDerivativeLiability27.123.119.117.425.822.256.246.766.754.550.057.143.637.737.215.618.217.123.928.728.123.323.731.654.232.530.836.544.268.450.032.439.421.918.235.043.5

us-gaap:DerivativeInstrumentsAndHedgesLiabilities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value972438202423131388720536643104132261271290420297140252131165947183368328347192222429661
Percentage of DerivativeInstrumentsAndHedgesLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EmployeeRelatedLiabilitiesCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value176270256258189331281227214345314237222181195232249241295331353662503419348516424389321511349321269468358288263403344250272
Percentage of EmployeeRelatedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value172536459569747868
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AwardType

us-gaap:RestrictedStock



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value1021089910157445437
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized600.0432.0275.0224.460.063.873.047.4

us-gaap:EquityMethodInvestments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value57282291294299301304308312309309306302307311314324327331327360362356351402390373357410393370365409391371361402386365358390393421
Percentage of EquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinanceLeaseLiability



Period End2019-12-312019-09-302019-06-302019-03-312019-01-01
Value280285293284285
Percentage of FinanceLeaseLiability100.0100.0100.0100.0100.0

us-gaap:FinanceLeaseLiabilityCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value32303028247
Percentage of FinanceLeaseLiabilityCurrent100.0100.0100.0100.0100.0100.0

us-gaap:FinanceLeaseLiabilityNoncurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value252250255265260222
Percentage of FinanceLeaseLiabilityNoncurrent100.0100.0100.0100.0100.0100.0

us-gaap:FinanceLeaseRightOfUseAsset



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312019-01-01
Value211230236246247249
Percentage of FinanceLeaseRightOfUseAsset100.0100.0100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value62034843143280424712115174913861081-805-560
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsByMajorClass

nov:OtherFiniteLivedIntangibleAssets



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312010-12-312009-12-31
Value145377324640576510407327-174-121
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization23.410.810.322.823.324.123.323.621.621.6

us-gaap:CustomerRelationships



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312010-12-312009-12-31
Value305235221181874163013791147907-536-366
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization49.267.567.466.866.065.265.665.466.665.4

us-gaap:Patents



Period End2019-12-312018-12-312017-12-312016-12-31
Value47414384345
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization7.611.912.212.3

us-gaap:Trademarks



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312010-12-312009-12-31
Value123341317290265226195152-95-73
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization19.89.810.110.310.710.711.111.011.813.0

us-gaap:FinancialInstrument

us-gaap:ForeignCurrencyCashFlowHedgeDerivativeAtFairValueNet

us-gaap:ForwardContracts



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-31
Value1760017600176001760017600411838751193029292237522
Percentage of ForeignCurrencyCashFlowHedgeDerivativeAtFairValueNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill



Period End2020-03-312019-12-312019-09-302019-06-302019-05-312019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value534852866900400294230203072317132153301337734383467353036263709380038494087425742904444469548084953505551805305539947434431451240044073399540634026410338773928398740524300
Percentage of IndefiniteLivedIntangibleAssetsExcludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IntangibleAssetsGrossExcludingGoodwill



Period End2019-12-312018-12-312017-12-31
Value147265046444
Percentage of IntangibleAssetsGrossExcludingGoodwill100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsByMajorClass

nov:OtherFiniteLivedIntangibleAssets



Period End2019-12-312018-12-312017-12-31
Value283491499
Percentage of IntangibleAssetsGrossExcludingGoodwill19.27.57.7

us-gaap:CustomerRelationships



Period End2019-12-312018-12-312017-12-31
Value59840784074
Percentage of IntangibleAssetsGrossExcludingGoodwill40.662.763.2

us-gaap:Patents



Period End2019-12-312018-12-312017-12-31
Value121661602
Percentage of IntangibleAssetsGrossExcludingGoodwill8.210.29.3

us-gaap:Trademarks



Period End2019-12-312018-12-312017-12-31
Value190891885
Percentage of IntangibleAssetsGrossExcludingGoodwill12.913.713.7

us-gaap:IndefiniteLivedIntangibleAssetsByMajorClass

us-gaap:TradeNames



Period End2019-12-312018-12-312017-12-31
Value280383384
Percentage of IntangibleAssetsGrossExcludingGoodwill19.05.96.0

us-gaap:InterestPayableCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value2582772772772772972982982982911301130113011311235149797851411141111
Percentage of InterestPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InventoryAdjustments



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value8598431047907634500370396338281270206
Percentage of InventoryAdjustments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InventoryFinishedGoodsNetOfReserves



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value19832099239626061948187119501931188218342001190418231803241826162899297731373185311929993000290035903630383038433825371835933234254222712251184517571774170716311479
Percentage of InventoryFinishedGoodsNetOfReserves100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InventoryGross



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value28913040358437653620
Percentage of InventoryGross100.0100.0100.0100.0100.0

us-gaap:InventoryRawMaterialsAndSuppliesNetOfReserves



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value531577676637627614627655659656719786903961104510661040106911431227125012551315126714141175119112251246126812451167993907823772721661671703704
Percentage of InventoryRawMaterialsAndSuppliesNetOfReserves100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InventoryValuationReserves



Period End2019-12-312018-12-312017-12-312016-12-312015-12-31
Value8436448001017500
Percentage of InventoryValuationReserves100.0100.0100.0100.0100.0

us-gaap:InventoryWorkInProcessNetOfReserves



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value37736451252255650160057260551349951752856169860559563289298210091027114910316557981057101510649051151110099385283311391092953118411091307
Percentage of InventoryWorkInProcessNetOfReserves100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CreditFacility

us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity

nov:FiveYearCreditFacility



Period End2020-03-312019-12-312019-03-312018-12-312018-09-302017-12-312017-09-302017-06-302017-06-27
Value200020003000300030003000300030003000
Percentage of LineOfCreditFacilityMaximumBorrowingCapacity100.0100.0100.0100.0100.0100.0100.0100.0100.0

nov:FiveYearUnsecuredRevolvingCreditFacility



Period End2020-03-312019-10-302019-09-302019-06-302019-03-312018-09-302017-06-27
Value2000200030003000300030003000
Percentage of LineOfCreditFacilityMaximumBorrowingCapacity100.00.00.00.0100.0100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:LongtermDebtType

us-gaap:LongTermDebtFairValue

us-gaap:FairValueInputsLevel2, us-gaap:UnsecuredDebt



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value14451947242223552211
Percentage of LongTermDebtFairValue100.0100.0100.0100.0100.0

us-gaap:OperatingLeaseLiability



Period End2019-12-312019-09-302019-06-302019-03-312019-01-01
Value508501519559554
Percentage of OperatingLeaseLiability100.0100.0100.0100.0100.0

us-gaap:OperatingLeaseLiabilityCurrent



Period End2020-03-312019-12-31
Value8384
Percentage of OperatingLeaseLiabilityCurrent100.0100.0

us-gaap:OperatingLeaseLiabilityNoncurrent



Period End2020-03-312019-12-31
Value394424
Percentage of OperatingLeaseLiabilityNoncurrent100.0100.0

us-gaap:OperatingLossCarryforwards



Period End2019-12-312018-12-312017-12-312016-12-312010-12-31
Value121389381669920
Percentage of OperatingLossCarryforwards100.0100.0100.0100.0100.0

us-gaap:IncomeTaxAuthority

us-gaap:DomesticCountry



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value2343422242120202020
Percentage of OperatingLossCarryforwards19.33.82.73.40.00.00.00.00.0

us-gaap:ForeignCountry



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value8257156495067653811707634
Percentage of OperatingLossCarryforwards68.080.179.572.40.00.00.00.00.0

us-gaap:StateAndLocalJurisdiction



Period End2019-12-312018-12-312017-12-312016-12-31
Value154144145169
Percentage of OperatingLossCarryforwards12.716.117.824.2

us-gaap:IncomeTaxAuthority, us-gaap:TaxCreditCarryforward

us-gaap:DomesticCountry, nov:OperatingLossCarryforwardNoExpiration



Period End2019-12-31
Value198
Percentage of OperatingLossCarryforwards16.3

us-gaap:DomesticCountry, nov:OperatingLossCarryforwardsExpirationPeriodOne



Period End2019-12-312017-12-312016-12-31
Value668
Percentage of OperatingLossCarryforwards0.50.71.1

us-gaap:DomesticCountry, nov:OperatingLossCarryforwardsExpirationPeriodTwo



Period End2019-12-312017-12-312016-12-31
Value301616
Percentage of OperatingLossCarryforwards2.52.02.3

us-gaap:ForeignCountry, nov:OperatingLossCarryforwardNoExpiration



Period End2019-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value40637226130922881
Percentage of OperatingLossCarryforwards33.545.637.30.00.00.0

us-gaap:ForeignCountry, nov:OperatingLossCarryforwardsExpirationPeriodOne



Period End2019-12-312017-12-312016-12-31
Value735778
Percentage of OperatingLossCarryforwards6.07.011.2

us-gaap:ForeignCountry, nov:OperatingLossCarryforwardsExpirationPeriodTwo



Period End2019-12-312017-12-312016-12-31
Value346123102
Percentage of OperatingLossCarryforwards28.515.114.6

us-gaap:StateAndLocalJurisdiction, nov:OperatingLossCarryforwardsExpirationPeriodOne



Period End2019-12-312017-12-312016-12-31
Value421
Percentage of OperatingLossCarryforwards0.30.20.1

us-gaap:StateAndLocalJurisdiction, nov:OperatingLossCarryforwardsExpirationPeriodTwo



Period End2019-12-312017-12-312016-12-31
Value1501614
Percentage of OperatingLossCarryforwards12.42.02.0

us-gaap:TaxCreditCarryforward

nov:CarryForwardExpirationYearFive



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value881871111247373
Percentage of OperatingLossCarryforwards7.320.91.31.60.00.00.0

nov:CarryForwardExpirationYearOne



Period End2019-12-312018-12-312017-12-312016-12-31
Value1110141141
Percentage of OperatingLossCarryforwards0.91.117.320.2

nov:CarryForwardExpirationYearSix



Period End2019-12-312014-12-312013-12-31
Value352871
Percentage of OperatingLossCarryforwards2.90.00.0

nov:CarryForwardExpirationYearThree



Period End2019-12-312018-12-312017-12-31
Value285286219
Percentage of OperatingLossCarryforwards23.532.026.8

nov:CarryForwardExpirationYearTwo



Period End2019-12-312018-12-312017-12-312016-12-31
Value141141287252
Percentage of OperatingLossCarryforwards11.615.835.236.1

nov:OperatingLossCarryforwardNoExpiration



Period End2019-12-312018-12-312017-12-312016-12-31
Value604428372261
Percentage of OperatingLossCarryforwards49.847.945.637.3

nov:OperatingLossCarryforwardsExpirationPeriodOne



Period End2019-12-312018-12-312017-12-312016-12-31
Value83596587
Percentage of OperatingLossCarryforwards6.86.68.012.4

nov:OperatingLossCarryforwardsExpirationPeriodTwo



Period End2019-12-312018-12-312017-12-312016-12-31
Value526178155132
Percentage of OperatingLossCarryforwards43.419.919.018.9

us-gaap:OperatingLossCarryforwardsValuationAllowance



Period End2019-12-312018-12-312017-12-312016-12-312010-12-31
Value2691541571207
Percentage of OperatingLossCarryforwardsValuationAllowance100.0100.0100.0100.0100.0

us-gaap:IncomeTaxAuthority

us-gaap:DomesticCountry



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value4964757777
Percentage of OperatingLossCarryforwardsValuationAllowance18.23.92.55.80.00.00.00.00.0

us-gaap:ForeignCountry



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value211140145112584122165
Percentage of OperatingLossCarryforwardsValuationAllowance78.490.992.493.30.00.00.00.00.0

us-gaap:StateAndLocalJurisdiction



Period End2019-12-312018-12-312017-12-312016-12-31
Value9881
Percentage of OperatingLossCarryforwardsValuationAllowance3.35.25.10.8

us-gaap:OtherLongTermDebt



Period End2020-03-312019-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value219232234232232234236236237240196196454522222335677877131299111214-853161726
Percentage of OtherLongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueRemainingPerformanceObligation



Period End2020-03-312019-12-312019-03-312018-12-312018-09-302018-06-302018-03-31
Value35584286715181340826102523
Percentage of RevenueRemainingPerformanceObligation100.0100.0100.0100.0100.0100.0100.0

us-gaap:SeniorNotes



Period End2020-03-312019-12-312019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value19811980248324822482248124812480
Percentage of SeniorNotes100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrument

nov:SeniorNotesDueOnDecemberOneTwoThousandFortyTwo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-31
Value10891088108910881088108810881088108810881087108710871087108710871087109610961096
Percentage of SeniorNotes55.054.90.00.043.843.843.843.943.943.90.00.00.00.00.00.00.00.00.00.0

nov:SeniorNotesDueOnDecemberOneTwoThousandTwentyTwo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-31
Value399399139513951395139413941393139313921392139213911391139013901390139613961396
Percentage of SeniorNotes20.120.20.00.056.256.256.256.156.156.10.00.00.00.00.00.00.00.00.00.0

us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber

nov:RestrictedStockAndRestrictedStockUnits



Period End2019-12-312018-12-312017-12-312016-12-312015-12-31
Value65441
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber100.0100.0100.0100.0100.0

us-gaap:StockAppreciationRightsSARS



Period End2019-12-312018-12-312017-12-312016-12-31
Value1114
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber21.223.730.595.1

us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue

nov:RestrictedStockAndRestrictedStockUnits



Period End2019-12-312018-12-312017-12-312016-12-312015-12-31
Value33.134.4137.0441.161.53
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue100.0100.0100.0100.0100.0

us-gaap:StockAppreciationRightsSARS



Period End2019-12-312018-12-312017-12-312016-12-31
Value28.4528.4928.4128.32
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue86.082.876.768.9

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-31
Value171514975545553
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-31
Value50.4954.1355.061.5660.355.0653.4643.9938.4736.3133.1426.17
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value1715149755455
Percentage of ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRange

nov:RangeOne



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value12973223230
Percentage of ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions68.961.753.433.728.641.154.950.561.67.8

nov:RangeThree



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value2222222003
Percentage of ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions11.514.316.626.637.140.234.414.40.669.0

nov:RangeTwo



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value3343210111
Percentage of ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions19.624.030.139.734.318.710.735.037.823.2

us-gaap:ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value2121221715101091011
Percentage of ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRange

nov:RangeOne



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value15151510723240
Percentage of ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions74.072.370.358.049.322.330.125.739.33.8

nov:RangeThree



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value2222224427
Percentage of ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions9.610.310.615.018.027.538.345.421.567.1

nov:RangeTwo



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value3344553243
Percentage of ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions16.317.419.127.132.750.231.628.939.229.1

us-gaap:SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1



Period End2019-12-312018-12-31
Value50.4954.13
Percentage of SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1100.0100.0

us-gaap:ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRange

nov:RangeOne



Period End2019-12-312018-12-31
Value41.5844.14
Percentage of SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice182.481.5

nov:RangeThree



Period End2019-12-312018-12-31
Value75.9675.95
Percentage of SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1150.4140.3

us-gaap:SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1



Period End2019-12-312018-12-31
Value47.6848.88
Percentage of SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1100.0100.0

us-gaap:ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRange

nov:RangeOne



Period End2019-12-312018-12-31
Value39.7740.68
Percentage of SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance183.483.2

nov:RangeThree



Period End2019-12-312018-12-31
Value75.9675.95
Percentage of SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1159.3155.4

us-gaap:StandardProductWarrantyAccrualCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-312008-12-31
Value869097101102105114120129135147161169172190208226244257261284272267267248228222205188194210216209211232230213215220214217114
Percentage of StandardProductWarrantyAccrualCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-312006-12-31
Value555478468129848713840138891397613968141511416014151140221398514003148881618616433164601820619005191222077221619214182279222330217252095120679203561968318931185201772817239169051640115862154041483714580142281272467245059
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-31
Value-16-16-27-27-27-27-13-13-13-13-37-69
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest-0.3-0.2-0.3-0.3-0.2-0.2-0.1-0.1-0.1-0.1-0.3-0.4

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312016-12-312015-12-31
Value-56-4-21-7-10-14867-39-205
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest-1.0-0.1-0.3-0.1-0.1-0.10.10.00.0-0.3-1.2

us-gaap:AccumulatedOtherComprehensiveIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-312007-12-312006-12-31
Value-1655-1423-1524-1392-1413-1437-1328-1298-1061-1110-1452-1553-834-4107-239190-16119546
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest-29.8-18.1-18.7-16.4-10.2-10.3-9.5-9.3-7.5-7.8-10.4-9.4-4.0-0.00.5-0.10.60.6-1.32.90.9

us-gaap:AccumulatedTranslationAdjustment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-31
Value-1583-1403-1476-1358-1376-1396-1323-1291-1068-1104-1376-1279
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest-28.5-17.9-18.2-16.0-9.9-10.1-9.5-9.2-7.5-7.8-9.8-7.8

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-312007-12-312006-12-31
Value851885078483844184088390836183068256823481038005834189078743853583538214798936173460
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest153.4108.4104.499.560.860.459.859.558.358.157.948.640.239.943.048.152.757.762.853.868.4

us-gaap:CommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-312007-12-312006-12-31
Value444444444444444444433
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest0.10.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.1

us-gaap:NoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-312007-12-312006-12-31
Value68687276757070686966637780100117109114115966336
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest1.20.90.90.90.50.50.50.50.50.50.40.50.40.40.60.60.70.80.80.90.7

us-gaap:Parent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-312007-12-312006-12-31
Value548677788057841113765138191390613900140821409413940163832069222230202391761915748141131262866615023
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest98.899.199.199.199.599.599.599.599.599.599.699.599.699.699.499.499.399.299.299.199.3

us-gaap:RetainedEarnings



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-312007-12-312006-12-31
Value-13816901094135867666862686968886883696672859927131811332311385910373005805479628461514
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest-24.98.813.516.048.949.449.149.348.649.252.060.363.559.755.951.346.040.837.742.329.9

us-gaap:UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued



Period End2019-12-312018-12-312017-12-312016-12-312015-12-31
Value111232155
Percentage of UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued100.0100.0100.0100.0100.0

us-gaap:ValuationAllowancesAndReservesType

us-gaap:ValuationAllowancesAndReservesBalance

us-gaap:AllowanceForCreditLoss



Period End2019-12-312018-12-312017-12-312016-12-312015-12-31
Value132161187209159
Percentage of ValuationAllowancesAndReservesBalance100.0100.0100.0100.0100.0

us-gaap:InventoryValuationReserve



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value8436448001017500370396338
Percentage of ValuationAllowancesAndReservesBalance638.6400.0427.8486.6314.50.00.00.0

us-gaap:ReserveForEnvironmentalCosts



Period End2019-12-312018-12-312017-12-312016-12-31
Value104663843
Percentage of ValuationAllowancesAndReservesBalance78.841.020.320.6

us-gaap:ValuationAllowanceOfDeferredTaxAssets



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-312007-12-31
Value1175955120254463481339313981014
Percentage of ValuationAllowancesAndReservesBalance890.2593.2642.8260.339.60.00.00.00.00.00.00.00.0

us-gaap:WarrantyReserves



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-312007-12-31
Value9010513517224427222819421121521711492
Percentage of ValuationAllowancesAndReservesBalance68.265.272.282.3153.50.00.00.00.00.00.00.00.0

Line plots across dimensions of each concept

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:StatementGeographical, us-gaap:Subsegments


us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:StatementGeographical, us-gaap:Subsegments


us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ConsolidationItems


us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments


us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ConsolidationItems, us-gaap:StatementGeographical, us-gaap:Subsegments


us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ConsolidationItems, us-gaap:StatementGeographical, us-gaap:Subsegments


us-gaap:OperatingIncomeLoss us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments


us-gaap:ProfitLoss us-gaap:StatementEquityComponents


us-gaap:Assets us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments


us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType


us-gaap:PropertyPlantAndEquipmentNet us-gaap:StatementGeographical


us-gaap:Goodwill us-gaap:StatementBusinessSegments


us-gaap:Goodwill us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments


us-gaap:Goodwill us-gaap:StatementBusinessSegments, us-gaap:Subsegments


us-gaap:Goodwill us-gaap:Subsegments


us-gaap:IntangibleAssetsNetExcludingGoodwill us-gaap:StatementBusinessSegments


us-gaap:IntangibleAssetsNetExcludingGoodwill us-gaap:FiniteLivedIntangibleAssetsByMajorClass


us-gaap:ProfitLoss us-gaap:StatementEquityComponents


us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument