MRO


Line plots across dimensions of each concept
Line plots across concepts
Tables

Table of contents



us-gaap:CommonStockValue

us-gaap:CommonStockSharesIssued

us-gaap:CommonStockSharesAuthorized
us-gaap:StatementEquityComponents
us-gaap:CommonStockSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareDiluted

us-gaap:EarningsPerShareBasicAndDiluted

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:CostsAndExpenses

us-gaap:GainsLossesOnExtinguishmentOfDebt
us-gaap:ConsolidationItems

us-gaap:GeneralAndAdministrativeExpense
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeTaxExpenseBenefit
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:IncomeTaxesPaidNet

us-gaap:InterestPaidNet

us-gaap:NetIncomeLoss
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:StatementEquityComponents

us-gaap:OperatingIncomeLoss
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

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

us-gaap:Revenues
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

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

us-gaap:Liabilities

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents

us-gaap:AssetsCurrent
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:AccountsReceivableNetCurrent

us-gaap:ReceivablesNetCurrent

us-gaap:InventoryNet

us-gaap:OtherAssetsCurrent

us-gaap:NoncurrentAssets
us-gaap:StatementGeographical
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:AssetsNoncurrent
us-gaap:PropertyPlantAndEquipmentByType
us-gaap:PropertyPlantAndEquipmentGross

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:PropertyPlantAndEquipmentNet
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OtherAssetsNoncurrent

us-gaap:AccountsPayableCurrent

us-gaap:AccruedIncomeTaxesCurrent

us-gaap:LiabilitiesCurrent
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:LongTermDebtCurrent
us-gaap:DebtInstrument

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OtherLiabilitiesCurrent
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:LiabilitiesNoncurrent

us-gaap:LongTermDebt

us-gaap:LongTermDebtNoncurrent

us-gaap:LongTermDebtAndCapitalLeaseObligations

us-gaap:DeferredIncomeTaxLiabilitiesNet
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:OperatingLeaseLiability

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
us-gaap:StatementEquityComponents

us-gaap:CommonStockValue

us-gaap:AdditionalPaidInCapital

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:TreasuryStockValue

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
us-gaap:StatementEquityComponents

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:DeferredIncomeTaxExpenseBenefit

us-gaap:DepreciationDepletionAndAmortization
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:IncreaseDecreaseInInventories

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetIncomeLoss
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:StatementEquityComponents

us-gaap:ShareBasedCompensation

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:PaymentsOfDividends

us-gaap:PaymentsForRepurchaseOfCommonStock
us-gaap:DebtInstrument
us-gaap:DebtInstrumentInterestRateStatedPercentage
us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:EffectiveIncomeTaxRateContinuingOperations

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
us-gaap:AwardType

us-gaap:DeferredTaxLiabilities

us-gaap:DeferredTaxAssetsNet

us-gaap:UnrecognizedTaxBenefits

us-gaap:DeferredTaxAssetsValuationAllowance

mro:AssetRetirementObligationIncreaseDecreaseNoncashExcludingDispositions
us-gaap:ImpairedLongLivedAssetsHeldAndUsedByType
mro:FairValueOfEquityMethodInvestmentsImpairedDuringThePeriod

mro:GoodwillAndLongLivedAssetImpairments

mro:InvestmentsRepaymentsOfLoansAndReturnOfCapital

mro:LessorOperatingLeaseAnnualPaymentstobeReceived
us-gaap:DebtInstrument
mro:MakeWholeProvisionPremiumAndWriteOffOfDiscountAndIssuanceCosts

mro:NetInterestAndOther
us-gaap:ConsolidationItems
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

mro:NetSettlementOfDerivativeInstruments
us-gaap:DerivativeInstrumentRisk

mro:ProceedsFromSaleOfAssetsNetOfCashTransferredToBuyer
us-gaap:Vesting
mro:ShareBasedCompensationArrangementPerformanceSharesVestingPercentageBankingFeatureLockThresholdPercentage

mro:StockRepurchasedForTaxObligationsAssociatedWithRestrictedStockAwardsValue

us-gaap:AllowanceForDoubtfulAccountsReceivableRecoveries

us-gaap:AllowanceForDoubtfulAccountsReceivableWriteOffs

us-gaap:AssetImpairmentCharges
us-gaap:ConsolidationItems

us-gaap:AssetRetirementObligationAccretionExpense

us-gaap:AssetRetirementObligationLiabilitiesIncurred

us-gaap:AssetRetirementObligationLiabilitiesSettled

us-gaap:AssetRetirementObligationRevisionOfEstimate
us-gaap:StatementGeographical

us-gaap:CapitalExpendituresIncurredButNotYetPaid

us-gaap:CommonStockDividendsPerShareCashPaid
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanInterestCost
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost
us-gaap:ConsolidationItems, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments
us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1
us-gaap:ConsolidationItems
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents
us-gaap:RetirementPlanType
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanServiceCost
us-gaap:DerivativeInstrumentRisk
us-gaap:DerivativeGainLossOnDerivativeNet
us-gaap:ConsolidationItems, us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship
us-gaap:DerivativeGainOnDerivative
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship

us-gaap:DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:ConsolidationItems, us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship
us-gaap:DerivativeLossOnDerivative
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

us-gaap:DividendsCommonStockCash
us-gaap:StatementEquityComponents

us-gaap:EquityMethodInvestmentOtherThanTemporaryImpairment
us-gaap:ImpairedLongLivedAssetsHeldAndUsedByType

us-gaap:ExplorationAbandonmentAndImpairmentExpense

us-gaap:ExplorationExpense
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:GainLossOnDispositionOfAssets1
us-gaap:ConsolidationItems

us-gaap:GainLossOnSaleOfDerivatives

us-gaap:GainLossOnTerminationOfLease

us-gaap:GoodwillImpairmentLoss
us-gaap:ImpairedLongLivedAssetsHeldAndUsedByType

us-gaap:ImpairmentOfLongLivedAssetsHeldForUse
us-gaap:ConsolidationItems, us-gaap:StatementGeographical

us-gaap:ImpairmentOfOilAndGasProperties
us-gaap:ConsolidationItems, us-gaap:StatementGeographical
us-gaap:ImpairedLongLivedAssetsHeldAndUsedByType
us-gaap:StatementGeographical

us-gaap:IncomeLossFromEquityMethodInvestments
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions

us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities

us-gaap:IncreaseDecreaseInOtherCurrentAssetsAndLiabilitiesNet

us-gaap:IncreaseDecreaseInPensionAndPostretirementObligations

us-gaap:IncreaseDecreaseInReceivables

us-gaap:OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax
us-gaap:DerivativeInstrumentRisk
us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
us-gaap:StatementEquityComponents

us-gaap:OtherOperatingActivitiesCashFlowStatement

us-gaap:OtherOperatingIncome
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:RetirementPlanType
us-gaap:OtherPostretirementBenefitsPayments

us-gaap:PaymentsForProceedsFromOtherInvestingActivities

us-gaap:PaymentsToAcquireBusinessesNetOfCashAcquired
us-gaap:StatementGeographical
us-gaap:PaymentsToAcquireOilAndGasProperty
us-gaap:RetirementPlanFundingStatus
us-gaap:PensionContributions

us-gaap:ProceedsFromIncomeTaxRefunds
us-gaap:SubsequentEventType
us-gaap:DebtInstrument
us-gaap:ProceedsFromIssuanceOfDebt

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities

us-gaap:PropertyPlantAndEquipmentAdditions
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:ProvisionForDoubtfulAccounts
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType
us-gaap:DebtInstrument
us-gaap:RepaymentsOfDebt
us-gaap:DebtInstrument, us-gaap:SubsequentEventType

us-gaap:ResultsOfOperationsProductionOrLiftingCosts
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:ResultsOfOperationsTransportationCosts
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:RevenueFromRelatedParties

us-gaap:SeveranceCosts1
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
us-gaap:TitleOfIndividual, us-gaap:AwardType
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
us-gaap:Range, us-gaap:AwardType
us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation
us-gaap:StatementEquityComponents

us-gaap:TaxesExcludingIncomeAndExciseTaxes
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:ShareRepurchaseProgram
us-gaap:TreasuryStockSharesAcquired

us-gaap:TreasuryStockValueAcquiredCostMethod
us-gaap:ShareRepurchaseProgram
us-gaap:StatementEquityComponents

us-gaap:UnrealizedGainLossOnDerivatives
us-gaap:DerivativeInstrumentRisk
us-gaap:UnrealizedGainLossOnDerivativesAndCommodityContracts

dei:EntityCommonStockSharesOutstanding

mro:AllowanceForCreditLosses

mro:CommitmentsToAcquirePropertyPlantAndEquipment

mro:ContingentCapitalAndExpenseReceivableNoncurrent

mro:ContingentRoyaltyLiability
us-gaap:BalanceSheetLocation

mro:DebtImmediatelyDueIfChangeInControl
us-gaap:CreditFacility
mro:DebtInstrumentCovenantRatioOfIndebtednessToNetCapitalMaximum

mro:DeferredCreditAndOtherLiabilities

mro:Deferredcreditandotherliabilities
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
mro:DefinedBenefitPlanFairValueofPlanAssetsBeforeCommingledFunds
us-gaap:FairValueByMeasurementFrequency
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
mro:DerivativeSoldPut
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation, us-gaap:SubsequentEventType
us-gaap:Range, us-gaap:DebtInstrument
mro:EstimatedMakeWholeProvisionPremium
us-gaap:FairValueByMeasurementBasis
mro:FinancialAssetsFairValueDisclosure

mro:InventorySuppliesAndSundry

mro:LesseeFinanceLeaseMaximumFinancingAvailable

mro:LesseeFinanceLeaseTotalCostsIncurred

mro:LiquidHydrocarbonsNaturalGas
us-gaap:FairValueByMeasurementBasis
mro:OtherCurrentLiabilitiesFairValueDisclosure
us-gaap:FairValueByMeasurementBasis
mro:OtherNoncurrentAssetsFairValueDisclosure

mro:OverrideRoyaltyGOMFutureAbandonment
us-gaap:AwardType
mro:SharebasedCompensationArrangementbySharebasedPaymentAwardOptionsExpectedtoVestExercisableWeightedAverageExercisePrice

us-gaap:AccountsPayableRelatedPartiesCurrent

us-gaap:AccountsReceivableRelatedPartiesCurrent

us-gaap:AllowanceForDoubtfulAccountsReceivable

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent
us-gaap:DerivativeInstrumentRisk
us-gaap:AociDerivativeQualifyingAsHedgeExcludedComponentAfterTax

us-gaap:AssetRetirementObligation
us-gaap:StatementGeographical

us-gaap:AssetRetirementObligationCurrent
us-gaap:StatementGeographical

us-gaap:AssetRetirementObligationsNoncurrent

us-gaap:CapitalizedExploratoryWellCosts

us-gaap:CapitalizedExploratoryWellCostsThatHaveBeenCapitalizedForPeriodGreaterThanOneYear

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations

us-gaap:ContractWithCustomerReceivableAfterAllowanceForCreditLoss

us-gaap:CrudeOilAndNaturalGasLiquids

us-gaap:DebtInstrumentCarryingAmount
us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:DebtInstrumentUnamortizedDiscount

us-gaap:DebtLongtermAndShorttermCombinedAmount

us-gaap:DeferredIncomeTaxLiabilities

us-gaap:DeferredTaxAssetsGross
us-gaap:IncomeTaxAuthority
us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsNotSubjectToExpiration
us-gaap:IncomeTaxAuthority
us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration

us-gaap:DeferredTaxAssetsOther

us-gaap:DeferredTaxAssetsTaxCreditCarryforwardsForeign

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment

us-gaap:DeferredTaxLiabilitiesTaxDeferredIncome
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAccumulatedBenefitObligation
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAmountsRecognizedInBalanceSheet
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease
us-gaap:StatementScenario, us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationWeightedAverageInterestCreditingRate
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanBenefitObligation
us-gaap:StatementScenario
us-gaap:DefinedBenefitPlanExpectedAmortizationOfGainLossNextFiscalYear
us-gaap:StatementScenario, us-gaap:RetirementPlanType
us-gaap:StatementScenario
us-gaap:DefinedBenefitPlanExpectedAmortizationOfPriorServiceCostCreditNextFiscalYear
us-gaap:StatementScenario, us-gaap:RetirementPlanType
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo

us-gaap:DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear
us-gaap:RetirementPlanType
us-gaap:StatementScenario
us-gaap:StatementScenario, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureEmployerContributionsRemainderOfFiscalYear
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanFundedStatusOfPlan
us-gaap:InvestmentType
us-gaap:DefinedBenefitPlanPlanAssetsTargetAllocationPercentage
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:DerivativeAssets
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:HedgingDesignation
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementFrequency
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementFrequency, us-gaap:HedgingDesignation
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:DerivativeAssetsLiabilitiesAtFairValueNet
us-gaap:FairValueByMeasurementFrequency
us-gaap:DerivativeInstrumentRisk
us-gaap:DerivativeAverageVariableInterestRate
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:LongtermDebtType, us-gaap:SubsequentEventType
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:DerivativeCapPrice
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation, us-gaap:SubsequentEventType

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

us-gaap:DerivativeFairValueOfDerivativeLiability
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship
us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship

us-gaap:DerivativeFairValueOfDerivativeNet
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:DerivativeFloorPrice
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation, us-gaap:SubsequentEventType
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:DerivativeLiabilities
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:HedgingDesignation
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementFrequency
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementFrequency, us-gaap:HedgingDesignation
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementFrequency
us-gaap:DerivativeInstrumentRisk
us-gaap:DerivativeNotionalAmount
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:LongtermDebtType
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:LongtermDebtType, us-gaap:SubsequentEventType
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:StatementScenario, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation, us-gaap:Position
us-gaap:DerivativeSwapTypeAverageFixedPrice
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation, us-gaap:Position, us-gaap:SubsequentEventType

us-gaap:DueFromRelatedParties

us-gaap:DueToRelatedPartiesCurrentAndNoncurrent

us-gaap:EmployeeRelatedLiabilitiesCurrent

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
us-gaap:AwardType
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:EquityMethodInvestmentOwnershipPercentage

us-gaap:EquityMethodInvestments
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:FairValueByMeasurementBasis
us-gaap:EquityMethodInvestmentsFairValueDisclosure
us-gaap:FairValueByMeasurementBasis
us-gaap:FinancialLiabilitiesFairValueDisclosure

us-gaap:LesseeOperatingLeaseDiscountRate

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:LessorOperatingLeasePaymentsToBeReceived

us-gaap:LessorOperatingLeasePaymentsToBeReceivedRemainderOfFiscalYear

us-gaap:LessorOperatingLeasePaymentsToBeReceivedThereafter
us-gaap:CreditFacility
us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity
us-gaap:StatementScenario, us-gaap:CreditFacility
us-gaap:FairValueByMeasurementBasis
us-gaap:LongTermDebtFairValue

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo

us-gaap:OperatingLossCarryforwards
us-gaap:FairValueByMeasurementBasis
us-gaap:OtherAssetsFairValueDisclosure
us-gaap:FairValueByMeasurementBasis
us-gaap:OtherLiabilitiesFairValueDisclosure

us-gaap:OtherLongTermDebtNoncurrent
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities

us-gaap:PostemploymentBenefitsLiabilityNoncurrent
us-gaap:CreditFacility
us-gaap:RatioOfIndebtednessToNetCapital1
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
us-gaap:AwardType
us-gaap:SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
us-gaap:ShareRepurchaseProgram
us-gaap:StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1

us-gaap:TreasuryStockShares
us-gaap:StatementEquityComponents

us-gaap:UnamortizedDebtIssuanceExpense

Plots across concepts


IncomeStatement
Comprehensive Income Net Of Tax
Expenses
Income Tax Expense Benefit
Balance Sheet
Operating Lease Right Of Use Asset
Assets
Inventory Net
Current Assets
Other Assets Current
NonCurrent Assets
Operating Lease Right Of Use Asset
PropertyPlantAndEquipmentNet
Property Plant And Equipment Net
Liabilities
Operating Lease Liability
Current Liabilities
Long Term Debt Current
Noncurrent Liabilities
Operating Lease Liability Noncurrent
Stockholders Equity
Accumulated Other Comprehensive Income Loss Net Of Tax
Per Share
Earnings Per Share Diluted
CashFlow
Net Cash Provided By Used In Financing Activities
NetCashProvidedByUsedInOperatingActivities
Increase Decrease In Inventories
NetCashProvidedByUsedInInvestingActivities
Net Cash Provided By Used In Investing Activities
NetCashProvidedByUsedInFinancingActivities
Net Cash Provided By Used In Financing Activities
Shares
Treasury Stock Shares
DividendsAndRepurchase
Payments For Repurchase Of Common Stock
OperatingLeaseLiability
Operating Lease Liability Noncurrent
LesseeOperatingLeaseLiabilityPaymentsDue
Lessee Operating Lease Liability Payments Due Year Four
AccountsReceivable
Allowance For Doubtful Accounts Receivable Current

Tables

  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:CommonStockValue ██████████████████████▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁937.0937.0937.0937.0937.0937.0937.0937.0937.0937.0937.0937.0937.0937.0937.0937.0937.0937.0937.0937.0937.0937.0770.0770.0770.0770.0770.0770.0770.0770.0770.0770.0770.0770.0770.0770.0770.0770.0770.0770.0770.0770.0770.0NANANA
us-gaap:CommonStockSharesIssued ██████████████████████▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁937.0937.0937.0937.0937.0937.0937.0937.0937.0937.0937.0937.0937.0937.0937.0937.0937.0937.0937.0937.0937.0937.0770.0770.0770.0770.0770.0770.0770.0770.0770.0770.0770.0770.0770.0770.0770.0770.0770.0770.0770.0770.0770.0NANANA
us-gaap:CommonStockSharesAuthorized NANA1925.0NA1925.01925.01925.01925.01925.01925.01925.01925.01925.01100.01100.01100.01100.01100.01100.01100.01100.01100.01100.01100.01100.01000.01100.01100.01100.01100.01100.01100.01100.01100.01100.01100.01100.01100.01100.01100.01100.01100.01100.0NANANA
 us-gaap:CommonStockSharesOutstanding us-gaap:StatementEquityComponents us-gaap:CommonStockNANA937.0NANANA937.0NANANA937.0NANANA937.0NANANA937.0NANANA770.0NANANA770.0NANANA770.0NANANA770.0NANANA770.0NANANA770.0NANANA
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding ▄▄789.0789.0NA790.0790.0794.0NA803.0814.0820.0NA849.0855.0852.0NA850.0850.0849.0NA847.0848.0730.0NA677.0677.0675.0NA678.0679.0696.0NA711.0714.0712.0NA709.0709.0710.0NA714.0717.0715.0NA712.0712.0711.0
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic ▄▄789.0789.0NA790.0790.0794.0NA802.0813.0819.0NA848.0854.0851.0NA850.0850.0849.0NA847.0848.0730.0NA677.0677.0675.0NA675.0676.0693.0NA707.0710.0708.0NA706.0706.0706.0NA711.0713.0711.0NA710.0710.0709.0
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount ▁█4.06.0NA6.07.06.0NA6.06.05.0NA5.06.08.0NA10.012.012.0NA13.014.013.0NA13.013.013.0NA2.05.05.0NA4.06.06.0NA10.010.07.0NA9.05.05.0NA12.012.0NA
us-gaap:EarningsPerShareBasic ▆▇▆▆▆▆▆▇▇▇▇▇▇▇▆▆▆▁▅▆▆▆▅▅▆▆█▇▇█▇▇▇▇▇▇▇▇▇▇██▇▇▇▇0.020.12-0.42000000000000015-0.4-0.95-0.06-0.0300000000000000270.210.20.210.47000000000000010.30.110.42-0.03000000000000025-0.7-0.16-5.84-1.66-0.23-0.2-0.56-1.17-1.11-0.57-0.411.37000000000000060.640.81.660.54000000000000030.80.60.540.45000000000000020.640.560.590.78000000000000020.571.41.40.99000000000000020.981.00.64
us-gaap:EarningsPerShareDiluted ▆▇▆▆▆▆▆▇▇▇▇▇▇▇▆▆▆▁▅▆▆▆▅▅▆▆█▇▇█▇▇▇▇▇▇▇▇▇▇██▇▇▇▇0.020.12-0.42000000000000015-0.4-0.95-0.06-0.0300000000000000270.210.20.210.46000000000000010.30.110.42-0.03000000000000025-0.7-0.16-5.84-1.66-0.23-0.2-0.56-1.17-1.11-0.57-0.411.35999999999999990.640.81.650.53000000000000020.80.60.540.449999999999999960.630.560.590.77999999999999980.571.391.390.98999999999999980.981.00.64
us-gaap:EarningsPerShareBasicAndDiluted NANA-0.43-0.4-0.95-0.06-0.030.210.20.21NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
 Operating Margin us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName mro:ConsolidatedEquityMethodInvestments█▇▄▃▁▄▅▅246.0235.0163.0140.0111.0172.0195.0184.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
 TTM Greenblatt ROC _ _▄▄▃▃▂▃▄▄▄▄▄▄▄▅▄▃▃▃▃▃▃▂▁▁▃▃▃▄▅▆▅▆▇▇▇▇▇▆▆▆▅██105.0117.0-250.0-242.0-703.015.073.0237.0255.071.0467.0423.0205.0572.0208.0-377.0-26.062.053.0-203.0-152.0-598.0-914.0-1070.0-334.0-373.0-143.0508.0587.01182.0727.01422.01575.01480.01681.01782.01475.01394.01263.01333.0928.02103.01956.0NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:ComprehensiveIncomeNetOfTax ▁█-19.0136.0NA-297.0-796.0-68.0NA227.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:CostsAndExpenses ▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▃█▁▁▃1038.0954.01080.0996.0975.01215.01142.01108.01178.01126.01298.01244.01212.01161.01174.01629.01085.01010.01336.01432.01454.01328.02389.02393.01865.01905.02640.02463.02354.02347.02314.02492.02323.02626.02555.02379.02309.02646.02546.02466.02937.018968.062218.01905.01981.015665.0
us-gaap:GainsLossesOnExtinguishmentOfDebt -19.0NANANANANANANANANA0.00.0NANA-5.0-46.0NANA0.00.0NANANANANANANANANANANANANANA0.00.0NA0.00.00.00.0-279.00.00.0-92.00.0
 us-gaap:GainsLossesOnExtinguishmentOfDebt us-gaap:ConsolidationItems us-gaap:CorporateNonSegment-19.0NANANANANANANANANANANANANA-5.0-46.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:GeneralAndAdministrativeExpense ▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▁▂▁▂▃█▁▁▃68.089.057.053.088.076.093.082.087.094.088.0101.0105.0100.0101.097.093.0109.096.0105.0132.0151.0126.0125.0168.0171.0168.0160.0139.0192.0197.0152.0164.0174.0166.0139.0130.0120.0173.0104.0130.0353.01035.0108.0118.0298.0
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest ▃▃▂▂▂▃▃▃▃▃▄▄▃▄▃▂▃▃▃▃▃▂▁▁▂▂▃▄▄▅█▄▄▅26.0107.0-341.0-310.0-765.0-49.0-3.0175.0193.027.0406.0357.0140.0524.0132.0-458.0-112.0-16.0-24.0-290.0-238.0-683.0-1001.0-1145.0-392.0-420.0-201.0453.0511.01130.02763.0755.0804.01367.0NANANANANANANANANANANANA
us-gaap:IncomeTaxExpenseBenefit ▃▃▃▃▃▃▃▃▃▂▃▃▃▃▃▃▃▃█▂▂▁▂▁▃▂▂▃▃▅▄▆▇▇██▇▆▅▆▅▆▆▅▄▅10.010.0-3.07.0-15.0-3.017.010.032.0-147.016.0103.044.0168.0160.0141.041.034.01347.0-98.0-68.0-276.0-208.0-396.0-6.0-144.0-108.0149.0151.0590.0447.0787.01078.01025.01300.01279.01025.0927.0669.0898.0617.0763.0796.0567.0441.0513.0
us-gaap:IncomeTaxesPaidNet ▂▂▂▁▂▂▂▂▁▁▂▂▂▃▃▂▂▂▂▂▂▂▂▂▂▂▂▂▅▃▄▅█▆█▆█▅▅▅▅▄▅▄▃▃7.02.0-1.0-54.0-1.05.0224.0-2.0-120.0-29.025.016.051.0231.0290.058.028.015.016.07.046.015.0-3.09.0118.047.0165.0178.0883.0453.0686.0744.01471.01003.01517.01140.01489.0828.0710.0832.0746.0605.0729.0581.0439.0406.0
us-gaap:InterestPaidNet ▆▅▆▅▆▅▆██▁▆▅▆▅▇▆█▅█▅▆▆█▅▆▅▆▅▇▅▆▅▇▅▅▅▅▅▆▇▄▆▄▄▄▄70.053.076.049.074.052.079.0120.0122.0-52.083.053.082.052.0110.076.0129.064.0132.066.090.087.0125.057.088.055.088.052.093.056.091.056.099.061.061.051.063.050.071.0114.014.069.014.040.014.039.0
us-gaap:NetIncomeLoss ▇▇▆▆▆▇▇▇▇▇▇▇▇▇▇▆▇▁▅▆▆▆▆▆▆▆█▇▇█▇▇▇▇▇▇▇▇▇▇██▇▇▇▇16.097.0-338.0-317.0-750.0-46.0-20.0165.0161.0174.0390.0254.096.0356.0-28.0-599.0-139.0-4957.0-1371.0-192.0-170.0-407.0-793.0-749.0-386.0-276.0926.0431.0540.01149.0375.0569.0426.0383.0322.0450.0393.0417.0549.0405.0996.0996.0706.0696.0709.0457.0
us-gaap:OperatingIncomeLoss ▄▄▃▃▂▃▄▄▄▄▄▄▄▅▄▃▃▃▃▃▃▂▁▁▃▃▃▄▅▆▅▆▇▇▇▇▇▆▆▆▅██▆▅▆105.0117.0-250.0-242.0-703.015.073.0237.0255.071.0467.0423.0205.0572.0208.0-377.0-26.062.053.0-203.0-152.0-598.0-914.0-1070.0-334.0-373.0-143.0508.0587.01182.0727.01422.01575.01480.01681.01782.01475.01394.01263.01333.0928.02103.01956.01050.0922.01000.0
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax ▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▃█▁▁▃1254.01177.0822.0761.0490.01024.01233.01249.01381.01200.01380.01538.01447.01537.01336.01136.01059.01072.0-265.01229.01302.0730.01475.01323.01531.01532.02497.02971.02941.03529.03041.03914.03898.04106.04236.04161.03784.04040.03809.03799.03865.021071.064174.02955.02903.016665.0
us-gaap:Revenues ▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▃█▁▁▃1143.01071.0822.0754.0272.01230.01233.01345.01433.01197.01765.01667.01417.01733.01382.01252.01059.01072.01389.01229.01302.0730.01475.01323.01531.01532.02497.02971.02941.03529.03041.03914.03898.04106.04236.04161.03784.04040.03809.03799.03865.021071.064174.02955.02903.016665.0
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:Assets ▁▁▁▁▁▁▂▂▂▂▂▂▂▂▂▂▂▂▄▄▄▄▄▄▅▄▅▅▅▅▅▅▅▅▅▄▄▄▄▄▄██17800.018233.017956.018663.018567.019715.020245.020373.021282.021410.021321.021778.021871.021634.022012.022947.024241.024537.031094.032310.032527.032868.032311.034674.035770.034736.036011.036700.035935.036151.035620.035776.035048.035109.035306.034558.032250.031851.031371.030541.030490.051865.050014.0NANANA
us-gaap:Liabilities ▁▁▁▁▁▁▁▁▂▂▂▂▂▂▂▂▃▃▃▃▃▃▃▄▄▃▄▄▄▄▄▄▄▄▄▄▄▄▃▃▃██7166.07562.07395.07771.07392.07757.08092.08102.09181.09202.09193.09734.09739.09600.010304.011172.011836.011953.013553.013388.013374.013517.013758.015339.015552.014076.014991.016474.016067.016346.016276.016782.016027.016521.017023.016494.014465.014345.014212.013785.013783.027160.026243.0NANANA
us-gaap:LiabilitiesAndStockholdersEquity ▁▁▁▁▁▁▂▂▂▂▂▂▂▂▂▂▂▂▄▄▄▄▄▄▅▄▅▅▅▅▅▅▅▅▅▄▄▄▄▄▄██17800.018233.017956.018663.018567.019715.020245.020373.021282.021410.021321.021778.021871.021634.022012.022947.024241.024537.031094.032310.032527.032868.032311.034674.035770.034736.036011.036700.035935.036151.035620.035776.035048.035109.035306.034558.032250.031851.031371.030541.030490.051865.050014.0NANANA
us-gaap:StockholdersEquity ▁▁▁▁▁▂▂▂▂▂▂▂▂▂▂▂▂▃▇███▇█10634.010671.010561.010892.011175.011958.012153.012271.012101.012208.012128.012044.012132.012034.011708.011775.012405.012584.017541.018922.019153.019351.018553.019335.0NANA21020.0NANANANANANANA18283.018064.017785.017499.017152.0NANANA23771.0NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:AssetsCurrent ▁▁▁▁▁▁▁▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▃▂▂▃▂▂▂▂▂▂▂▂▂▄▄█▇2075.02150.01612.01922.01405.01909.02135.02520.02688.02776.02921.03065.03087.02902.02566.03690.04424.03743.03665.03042.03754.03268.02590.03858.04130.02968.04593.04204.04218.04787.02975.03455.03281.03777.03762.04037.03254.03445.03224.07154.07314.015775.013829.0NANANA
us-gaap:CashAndCashEquivalentsAtCarryingValue NANA742.0NA522.0817.0858.01165.0961.01019.01462.01564.01667.01613.0563.01795.02614.02490.02490.01953.02584.02072.01221.01680.01572.01126.02398.0761.01169.01964.0264.0354.0246.0768.0684.0671.0452.0513.0493.04633.04711.05716.03951.01643.02062.02718.0
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents NANA742.0NANANA858.0NANANA1462.0NANANA563.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:AccountsReceivableNetCurrent ▁▁▁▁▁▁▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁▂▂▂▂▃▃▃▃▃▃▃▃▃▃▃▃▂▃█▇841.0761.0747.0502.0620.0703.01122.01148.01144.01086.01079.01335.01176.01100.01082.0945.0767.0751.0877.0783.0822.0779.0912.0991.01195.01341.01729.02048.02042.02222.02134.02562.02443.02466.02389.02553.02047.02198.01917.01696.01790.06498.05972.0NANANA
us-gaap:ReceivablesNetCurrent █▆▃▁1008.0921.0747.0643.0NANA1122.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:InventoryNet ▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▁▂▂▂▇█78.078.076.077.077.078.072.071.072.083.096.0110.0117.0110.0126.0132.0140.0145.0227.0221.0272.0306.0313.0324.0336.0379.0357.0379.0404.0405.0364.0360.0368.0368.0361.0324.0335.0296.0361.0342.0343.03088.03453.0NANANA
us-gaap:OtherAssetsCurrent ▁▁▁▂▂▃▂▃▂▃▅▁▂▂▁▂▃▃▂▂▂▂▃▃▂▃▂▃▄▄▄▄▄▃▅▅▄▄▄█▇▇▇19.026.047.083.0107.0118.083.0136.0101.0160.0257.031.092.066.036.062.0160.0134.071.085.076.0111.0144.0163.0102.0122.0109.0143.0211.0196.0213.0179.0224.0175.0301.0269.0215.0233.0223.0458.0417.0414.0395.0NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:NoncurrentAssets NANA16085.0NANANA17663.0NANANA17549.0NANANA18512.0NANANA26649.0NANANA28064.0NANANA30153.0NANANA29346.0NANANA29551.0NANANA26707.0NANANANANANANA
 us-gaap:NoncurrentAssets us-gaap:StatementGeographical country:GQNANA861.0NANANA1156.0NANANA1333.0NANANA1582.0NANANA1794.0NANANA1917.0NANANA1949.0NANANA1977.0NANANA2081.0NANANANANANANANANANANA
 us-gaap:NoncurrentAssets us-gaap:StatementGeographical country:USNANA15224.0NANANA16507.0NANANA16094.0NANANA15971.0NANANA14272.0NANANA15353.0NANANA16518.0NANANA14635.0NANANA13677.0NANANANANANANANANANANA
 us-gaap:AssetsNoncurrent us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName mro:ConsolidatedEquityMethodInvestmentsNANA941.0NANANA1049.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType us-gaap:PropertyPlantAndEquipmentOtherTypesNANA1646.0NANANA1624.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType us-gaap:WellsAndRelatedEquipmentAndFacilitiesNANA682.0NANANA670.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment ▆▅▅▄▄▃▃▂▂▂▆▇▇▆▆▆▆▅▇▆▆▇███▇▆▅▅▇▆▆▅▅▄▃▂▂▂▁▁▅▄21364.020810.020358.019782.019216.018641.018003.017366.017260.017669.021830.022358.022336.021872.021564.021669.021238.020692.022214.021775.021659.022763.023260.023713.023395.022648.021884.021024.020207.022336.021895.021171.020639.020195.019266.018438.017777.017184.017248.016731.016243.020692.019805.0NANANA
us-gaap:PropertyPlantAndEquipmentNet ▁▁▁▁▂▂▂▂▂▂▂▂▂▂▂▂▂▂▅▅▅▆▆▆▇▇▇▇▆▆▆▆▆▆▆▆▅▅▅▃▃██15019.015313.015638.016029.016424.016903.017000.016717.016730.016714.016804.016899.016881.016931.017665.017645.018337.016533.025718.025976.025657.026737.027061.027920.029121.029291.029040.028658.027824.028426.028145.027822.027457.028382.028272.027446.026001.025365.025324.020318.020140.032189.032222.0NANANA
us-gaap:OperatingLeaseRightOfUseAsset ▁▄▇█92.0112.0133.0137.0NANA199.0226.0248.0247.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherAssetsNoncurrent ▁▁▁▁▁▁▁▁▁▂▂▃▃▃▂▂▂▂▂▆▆▅▅▄▃▃▃▃▃▄██▇▃▄▄▃▄▃▃▃▂▂248.0310.0259.0245.0262.0275.0352.0374.0420.0440.0723.0912.0860.0849.0764.0607.0543.0698.0665.02246.02057.01789.01542.01427.01015.0918.0806.0988.01088.01216.02800.02784.02567.01118.01468.01231.01151.01163.0904.01101.01024.0679.0781.0NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:AccountsPayableCurrent ▁▁▁▁▁▁▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁▂▂▂▂▃▃▃▃▂▃▂▂▂▃▂▂▂▂▂██937.0918.0837.0730.0696.01104.01307.01374.01401.01310.01320.01479.01428.01335.01395.01313.01158.01081.01078.0964.0953.01084.01313.01246.01507.01854.02545.02430.02439.02382.02206.02406.02152.02284.02285.02335.02158.02029.01864.01548.01631.08341.08000.0NANANA
us-gaap:AccruedIncomeTaxesCurrent ▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▂▂▁▂▆▆▆▆▇██▆██▇▇▇▆95.078.072.045.077.072.0118.086.077.0149.0181.0128.099.0128.0177.0162.078.081.094.066.085.0151.0132.0143.0156.0260.0285.0181.0193.01476.01445.01511.01397.01892.01987.02027.01440.02065.02015.01904.01839.01744.01447.0NANANA
us-gaap:LiabilitiesCurrent ▁▂▁▁▁▁▁▂▂▂▂▂▂▂▂▁▂▂▂▁▁▁▁▂▂▃▃▃▃▃▃▃▃▃▄▅▃▃▃▃▃██1575.01899.01213.01566.01065.01442.01745.02379.02471.01858.01832.02142.02044.01909.01968.01762.02082.03099.02240.01408.01382.01526.01729.02848.03052.03561.04379.04176.03974.04314.04333.04673.04008.04629.05081.06782.04691.04673.04394.04125.04161.011782.011113.0NANANA
us-gaap:LongTermDebtCurrent ▁█33.0500.0NA500.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OperatingLeaseLiabilityCurrent ▁▄▆█52.062.070.079.0NANA101.0104.0104.092.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherLiabilitiesCurrent ▆▄▃▂▂▂▂▂▂▂▁▅▅▄▃▂▂▂▃▃▂▂▁▃▂▃▃▂▁▂▂▄▃▂▂▂▂▂▁▂▂██461.0366.0247.0219.0216.0198.0208.0227.0216.0220.0170.0405.0405.0359.0288.0188.0206.0222.0253.0256.0229.0211.0150.0286.0235.0252.0290.0184.0147.0208.0239.0326.0254.0203.0188.0206.0211.0207.0158.0192.0193.0593.0580.0NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
 us-gaap:LiabilitiesNoncurrent us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName mro:ConsolidatedEquityMethodInvestmentsNANA170.0NANANA183.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LongTermDebt NANA5404.0NANANA5501.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LongTermDebtNoncurrent ▁▁██4875.04905.05404.05405.0NANA5501.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LongTermDebtAndCapitalLeaseObligations NANA5404.0NA5503.05502.05501.04903.04902.05501.05499.05498.05497.05495.05494.06488.06715.05723.06589.07277.07280.07280.07276.07323.07321.05326.05323.06355.06362.06392.06394.06433.06428.06476.06512.04518.04513.04559.04674.04705.04684.07992.07601.0NANANA
us-gaap:DeferredIncomeTaxLiabilitiesNet ▁▁▁▁▁▁▁▁▁▁▁▂▂▂█156.0160.0163.0184.0171.0185.0186.0183.0184.0192.0199.0215.0237.0221.0833.0NANANA769.0NANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent us-gaap:RetirementPlanSponsorLocation,us-gaap:RetirementPlanType country:US,us-gaap:OtherPostretirementBenefitPlansDefinedBenefitNANA70.0NANANA71.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent us-gaap:RetirementPlanSponsorLocation,us-gaap:RetirementPlanType country:US,us-gaap:PensionPlansDefinedBenefitNANA110.0NANANA112.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OperatingLeaseLiabilityNoncurrent ▁▅█▆44.058.067.061.0NANA107.0127.0151.0162.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo NANA44.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree NANA11.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour NANA5.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive NANA4.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive NANA2.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:StockholdersEquity ▁▁▁▁▁▂▂▂▂▂▂▂▂▂▂▂▂▃▇███▇█10634.010671.010561.010892.011175.011958.012153.012271.012101.012208.012128.012044.012132.012034.011708.011775.012405.012584.017541.018922.019153.019351.018553.019335.0NANA21020.0NANANANANANANA18283.018064.017785.017499.017152.0NANANA23771.0NANANA
us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest NANA10561.0NANANA12153.0NANANA12128.0NANANA11708.0NANANA17541.0NANANA18553.0NA20218.020660.021020.020226.019868.019805.019344.018994.019021.018588.018283.018064.017785.017506.017159.016756.016707.024705.023771.0NANANA
 us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:StatementEquityComponents us-gaap:AccumulatedOtherComprehensiveIncomeNANA73.0NANANA105.0NANANA63.0NANANA-62.0NANANA-83.0NANANA-135.0NANANA-277.0NANANA-250.0NANANA-433.0NANANA-370.0NANANA-997.0NANANA
 us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:StatementEquityComponents us-gaap:AdditionalPaidInCapitalNANA7174.0NANANA7207.0NANANA7238.0NANANA7379.0NANANA7446.0NANANA6498.0NANANA6531.0NANANA6592.0NANANA6616.0NANANA6680.06675.06723.0NA6756.0NANANA
 us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:StatementEquityComponents us-gaap:CommonStockNANA937.0NANANA937.0NANANA937.0NANANA937.0NANANA937.0NANANA770.0NANANA770.0NANANA770.0NANANA770.0NANANA770.0770.0770.0NA770.0NANANA
 us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:StatementEquityComponents us-gaap:RetainedEarningsNANA6466.0NANANA7993.0NANANA7706.0NANANA6779.0NANANA12672.0NANANA14974.0NANANA17638.0NANANA15135.0NANANA13890.0NANANA12788.012352.012053.0NA19907.0NANANA
 us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:StatementEquityComponents us-gaap:TreasuryStockNANA-4089.0NANANA-4089.0NANANA-3816.0NANANA-3325.0NANANA-3431.0NANANA-3554.0NANANA-3642.0NANANA-2903.0NANANA-2560.0NANANA-2716.0-2721.0-2493.0NA-2665.0NANANA
us-gaap:CommonStockValue ██████████████████████▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁937.0937.0937.0937.0937.0937.0937.0937.0937.0937.0937.0937.0937.0937.0937.0937.0937.0937.0937.0937.0937.0937.0770.0770.0770.0770.0770.0770.0770.0770.0770.0770.0770.0770.0770.0770.0770.0770.0770.0770.0770.0770.0770.0NANANA
us-gaap:AdditionalPaidInCapital ▆▆▆▆▆▅▆▆▆▆▆▆▆▆█▇▇▇████▁▁▁▁▁▁▁▂▂▂▂▂▂▂▂▂▂▂▃▃▃7201.07195.07174.07159.07143.07102.07207.07197.07170.07149.07238.07226.07227.07237.07379.07367.07349.07336.07446.07442.07433.07428.06498.06493.06484.06532.06531.06523.06530.06599.06592.06603.06614.06618.06616.06634.06667.06658.06680.06675.06723.06763.06756.0NANANA
us-gaap:RetainedEarningsAccumulatedDeficit ▁▁▁▁▁▂▂▂▂▂▂▁▁▁▁▁▂▂▄▅▅▅▅▆▆▆▆▆▆▆▅▅▅▅▅▅▄▄▄▄▄██6524.06540.06466.06828.07145.07895.07993.08053.07928.07808.07706.07357.07146.07093.06779.06849.07491.07673.012672.014086.014320.014533.014974.015800.016691.017220.017638.016854.016564.016151.015135.014892.014458.014153.013890.013688.013358.013084.012788.012352.012053.020725.019907.0NANANA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax ███████████▇▇▇▇▇▇▇▇▆▆▆▆▆▆▆▆▆▆▆▆▅▅▅▅▅▅▅▅▅▅▁▁77.0112.073.057.037.083.0105.0112.050.059.063.0-21.0-41.0-58.0-62.0-54.0-54.0-48.0-83.0-137.0-140.0-150.0-135.0-175.0-172.0-228.0-277.0-277.0-278.0-270.0-250.0-322.0-344.0-426.0-433.0-421.0-364.0-361.0-370.0-328.0-346.0-971.0-997.0NANANA
us-gaap:TreasuryStockValue ████████▇▆▇▅▄▄▅▅▅▅▅▅▅▅▆▆▆▆▆▆▆▅▃▃▁▁▁▂▂▂▂▂▁▁▂4105.04113.04089.04089.04087.04059.04089.04028.03984.03745.03816.03455.03137.03175.03325.03324.03318.03314.03431.03406.03397.03397.03554.03553.03555.03634.03642.03644.03718.03445.02903.02949.02477.02527.02560.02607.02646.02652.02716.02721.02493.02582.02665.0NANANA
us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue ▁█5.011.0NA14.021.0-22.0NA18.016.0-50.06.06.05.0-49.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities ▆▆▄▄▁▇▇▇█▅█655.0622.0418.0345.09.0701.0700.0737.0797.0515.0855.0NANANANANANANANANANANA352.0496.0408.0309.01155.01774.01088.01470.01229.01645.0868.01528.01205.01070.0769.0973.01034.01080.01818.02592.02885.0861.01278.0849.0
us-gaap:NetCashProvidedByUsedInInvestingActivities ▇▇▇█▇▄▁▂▄▄▄-256.0-207.0-243.0-145.0-304.0-611.0-894.0-795.0-565.0-564.0-549.0NANANANANANANANANANANA258.0-247.0-1771.0-1442.02.0-1544.0-1252.01048.0-1110.0-1112.0-1262.0-1037.0-1408.0-2030.0-1195.0-806.0-5056.0-738.0-1040.0-833.0-365.0-1114.0-1132.0-10.0
us-gaap:NetCashProvidedByUsedInFinancingActivities ▃▄▃▅▄▄▄▄▄▄▄▄▄▄▂▃▄▄▄▄▄▇▂▄█▄▄▄▃▃▄▄▄▄▅▇▅▄▄▄▁▄▄▄▃▄-554.0-32.0-552.0397.00.0-131.0-113.0-72.0-278.0-72.0-404.0-377.0-29.0-49.0-1043.0-864.0-46.0-50.0-37.0-44.0-43.01198.0-1068.0-139.01807.0-138.0-173.0-77.0-533.0-810.0-208.0-411.0-130.0-413.0215.01175.0367.0-157.0-113.0-403.0-1781.02.0-212.0-176.0-798.0-172.0
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect ▃▆▁█▂▃▂▃▃▃-155.0383.0-377.0597.0-295.0-41.0-307.0-131.0-46.0-120.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:DeferredIncomeTaxExpenseBenefit ▃▃▃▃▃▃▃▃▃▃▃▃▃▃▂▃▃▃█▂▂▁▂▁▃▂▂▃▃▃▂▂▃▃▂▂▃▃▂▄▂▂▂▂▂▃-3.0-4.0-20.012.0-13.0-1.00.0-1.0-2.0-31.0-10.068.025.0-31.0-105.06.024.014.01315.0-112.0-72.0-320.0-216.0-405.0-6.0-179.0-249.0164.068.0105.0-77.0-96.069.044.0-183.0-102.097.0-22.0-107.0352.0-185.0-242.0-189.0-132.0-254.0-25.0
us-gaap:DepreciationDepletionAndAmortization ▂▁▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▃▃▃▃▃▃▃▃▂▃▃▃▃▂▂▂▂▂▂▄█▂▁▂532.0496.0521.0554.0597.0644.0616.0622.0605.0554.0613.0626.0612.0590.0583.0641.0592.0556.0631.0594.0561.0609.0668.0717.0751.0821.0801.0737.0680.0697.0585.0720.0738.0747.0699.0625.0580.0574.0550.0517.0564.0852.01589.0530.0416.0649.0
us-gaap:IncreaseDecreaseInInventories ▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▄▄▅▅▅▄▅▅▄▅▅▅▅▅▅▅▅▅▅▅▅█▁▆▅▃▇0.02.0-1.00.0-1.06.01.0-1.01.0-4.0-10.0-6.08.09.0-6.0-9.0-5.010.06.0-51.0-23.0-7.0-6.0-9.0-43.022.0-21.0-26.017.041.08.0-8.01.015.028.0-12.025.0-7.014.0-1.0320.0-366.0136.0-6.0-194.0235.0
us-gaap:NetCashProvidedByUsedInOperatingActivities ▆▆▄▄▁▇▇▇█▅█655.0622.0418.0345.09.0701.0700.0737.0797.0515.0855.0NANANANANANANANANANANA352.0496.0408.0309.01155.01774.01088.01470.01229.01645.0868.01528.01205.01070.0769.0973.01034.01080.01818.02592.02885.0861.01278.0849.0
us-gaap:NetIncomeLoss ▇▇▆▆▆▇▇▇▇▇▇▇▇▇▇▆▇▁▅▆▆▆▆▆▆▆█▇▇█▇▇▇▇▇▇▇▇▇▇██▇▇▇▇16.097.0-338.0-317.0-750.0-46.0-20.0165.0161.0174.0390.0254.096.0356.0-28.0-599.0-139.0-4957.0-1371.0-192.0-170.0-407.0-793.0-749.0-386.0-276.0926.0431.0540.01149.0375.0569.0426.0383.0322.0450.0393.0417.0549.0405.0996.0996.0706.0696.0709.0457.0
us-gaap:ShareBasedCompensation ▄▁▆▆▅▆▆▅█▆▃▇▆▆▄▄▄▆▄▄▅▅▃11.06.014.015.013.015.015.013.018.014.09.016.014.014.012.012.012.014.011.011.013.013.010.0NANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:NetCashProvidedByUsedInInvestingActivities ▇▇▇█▇▄▁▂▄▄▄-256.0-207.0-243.0-145.0-304.0-611.0-894.0-795.0-565.0-564.0-549.0NANANANANANANANANANANA258.0-247.0-1771.0-1442.02.0-1544.0-1252.01048.0-1110.0-1112.0-1262.0-1037.0-1408.0-2030.0-1195.0-806.0-5056.0-738.0-1040.0-833.0-365.0-1114.0-1132.0-10.0
us-gaap:PaymentsToAcquirePropertyPlantAndEquipment ▁▁▁▁▂▃▃▃▃▃▃▃▃▃▃▂▂▂▁▁▂▂▂▃▄▆▆▆▅▄▄▅▅▅▆▅▅▄▄▃▃▄█▄▂▅274.0209.0253.0144.0326.0620.0616.0672.0647.0615.0684.0769.0638.0662.0669.0530.0492.0283.0262.0230.0299.0454.0528.0628.0868.01452.01521.01409.01179.01051.0948.01142.01301.01375.01431.01328.01164.01017.0858.0735.0640.01062.02059.0843.0512.01348.0
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:NetCashProvidedByUsedInFinancingActivities ▃▄▃▅▄▄▄▄▄▄▄▄▄▄▂▃▄▄▄▄▄▇▂▄█▄▄▄▃▃▄▄▄▄▅▇▅▄▄▄▁▄▄▄▃▄-554.0-32.0-552.0397.00.0-131.0-113.0-72.0-278.0-72.0-404.0-377.0-29.0-49.0-1043.0-864.0-46.0-50.0-37.0-44.0-43.01198.0-1068.0-139.01807.0-138.0-173.0-77.0-533.0-810.0-208.0-411.0-130.0-413.0215.01175.0367.0-157.0-113.0-403.0-1781.02.0-212.0-176.0-798.0-172.0
us-gaap:PaymentsOfDividends ▂▂▂▁▁▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▂▂▇▇▇▇▇▆▆▆▆▆▆▆▆▆▆▅▅██████32.023.024.00.00.040.040.040.041.041.041.043.043.042.042.043.043.042.043.042.043.034.033.0142.0143.0142.0142.0141.0127.0133.0132.0135.0121.0120.0120.0120.0119.0121.0105.0106.0178.0178.0178.0176.0178.0172.0
us-gaap:PaymentsForRepurchaseOfCommonStock ▁▁▁▁▁▂▂▁▄▁▆▅▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▇█▁▇▁▁▁0.09.00.00.00.092.066.030.0236.030.0364.0338.02.09.01.00.03.07.0-5.01.04.00.00.00.00.00.00.00.0449.0551.00.0500.00.00.00.0NANANA0.0NANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument mro:SeniorUnsecuredNoteDue2022NANANANANANANA2.8e-08NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument mro:SeniorUnsecuredNotes3850Due20253.85e-06NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument,us-gaap:LongtermDebtType mro:Bonds200Due2037,us-gaap:BondsNANA2e-06NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument,us-gaap:LongtermDebtType mro:Bonds210Due2037,us-gaap:BondsNANA2.1000000000000002e-06NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument,us-gaap:LongtermDebtType mro:Bonds2125Due2037,us-gaap:BondsNANA2.125e-06NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument,us-gaap:LongtermDebtType mro:Bonds220Due2037,us-gaap:BondsNANA2.2e-06NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument,us-gaap:LongtermDebtType mro:Bonds2375Due2037,us-gaap:BondsNANA2.375e-06NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument,us-gaap:LongtermDebtType mro:SeniorUnsecuredNotes2800Due2022,us-gaap:UnsecuredDebtNANA2.8e-06NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument,us-gaap:LongtermDebtType mro:SeniorUnsecuredNotes3850Due2025,us-gaap:UnsecuredDebtNANA3.85e-06NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument,us-gaap:LongtermDebtType mro:SeniorUnsecuredNotes4400Due2027,us-gaap:UnsecuredDebtNANA4.4e-06NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument,us-gaap:LongtermDebtType mro:SeniorUnsecuredNotes5200Due2045,us-gaap:UnsecuredDebtNANA5.2e-06NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument,us-gaap:LongtermDebtType mro:SeniorUnsecuredNotes6600Due2037,us-gaap:UnsecuredDebtNANA6.5999999999999995e-06NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument,us-gaap:LongtermDebtType mro:SeniorUnsecuredNotes6800Due2032,us-gaap:UnsecuredDebtNANA6.8e-06NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument,us-gaap:LongtermDebtType mro:SeniorUnsecuredNotes8125Due2023,us-gaap:UnsecuredDebtNANA8.125e-06NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument,us-gaap:LongtermDebtType mro:SeniorUnsecuredNotes8500Due2023,us-gaap:UnsecuredDebtNANA8.5e-06NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument,us-gaap:LongtermDebtType mro:SeniorUnsecuredNotes9375Due2022,us-gaap:UnsecuredDebtNANA9.375e-06NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value937937937937937937937937937937937937937937937937937937937937937937770770770770770770770770770770770770770770770770770770770770770769
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets5.35.15.25.05.04.84.64.64.44.44.44.34.34.34.34.13.93.83.02.92.92.92.42.22.22.22.12.12.12.12.22.22.22.22.22.22.42.42.52.52.51.51.51.6

Common Stock Shares Issued

us-gaap:CommonStockSharesIssued

us-gaap:CommonStockSharesIssued


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value937937937937937937937937937937937937937937937937937937937937937937770770770770770770770770770770770770770770770770770770770770770769
Percentage of CommonStockSharesIssued100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Common Stock Shares Authorized

us-gaap:CommonStockSharesAuthorized

us-gaap:CommonStockSharesAuthorized


Common
Period End2020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value19251925192519251925192519251925192519251100110011001100110011001100110011001100110011001000110011001100110011001100110011001100110011001100110011001100110011001100
Percentage of CommonStockSharesAuthorized100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Common Stock Shares Outstanding

us-gaap:CommonStockSharesOutstanding us-gaap:StatementEquityComponents

us-gaap:CommonStockSharesOutstanding

us-gaap:CommonStock


Common
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value937937937937937770770770770770770
Percentage of CommonStockSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value789789790790794803814820849855852850850849847848730677677675678679696711714712709709710714717715712712711
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value789789790790794802813819848854851850850849847848730677677675675676693707710708706706706711713711710710709
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount


Antidilutive
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value4.06.06.07.06.06.06.05.05.06.08.010.012121314131313132.05.05.04.06.06.010.010.07.09.05.05.01212
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareBasic


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.020.12-0.42-0.4-0.95-0.06-0.030.210.20.210.470.30.110.42-0.03-0.7-0.16-5.84-1.66-0.23-0.2-0.56-1.17-1.11-0.57-0.411.370.640.81.660.540.80.60.540.450.640.560.590.780.571.41.40.990.981.00.64
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted

us-gaap:EarningsPerShareDiluted


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.020.12-0.42-0.4-0.95-0.06-0.030.210.20.210.460.30.110.42-0.03-0.7-0.16-5.84-1.66-0.23-0.2-0.56-1.17-1.11-0.57-0.411.360.640.81.650.530.80.60.540.450.630.560.590.780.571.391.390.990.981.00.64
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Basic And Diluted

us-gaap:EarningsPerShareBasicAndDiluted

us-gaap:EarningsPerShareBasicAndDiluted


Earnings
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-0.43-0.4-0.95-0.06-0.030.210.20.21
Percentage of EarningsPerShareBasicAndDiluted100.0100.0100.0100.0100.0100.0100.0100.0

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTax


Comprehensive
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-30
Value-19.0136-297.0-796.0-68.0227
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-1.511.6-39.0-162.4-6.618.2

Costs And Expenses

us-gaap:CostsAndExpenses

us-gaap:CostsAndExpenses


Costs
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1038954108099697512151142110811781126129812441212116111741629108510101336143214541328238923931865190526402463235423472314249223232626255523792309264625462466293718968622181905198115665
Percentage of CostsAndExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax82.881.1131.4130.9199.0118.792.688.785.393.80.080.983.875.50.0143.4102.594.20.0116.5111.7181.90.0180.9121.8124.30.082.980.066.50.063.759.664.00.057.261.065.50.064.976.090.00.064.568.294.0

Gains Losses On Extinguishment Of Debt

us-gaap:GainsLossesOnExtinguishmentOfDebt

us-gaap:GainsLossesOnExtinguishmentOfDebt


Gains
Period End2021-06-302018-12-312018-09-302017-12-312017-09-302016-12-312016-09-302012-12-312012-09-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-19000000.000-5000000.0-46000000.000000000-279000000.000-92000000.00
Percentage of GainsLossesOnExtinguishmentOfDebt100.00.00.0100.0100.00.00.00.00.00.00.00.00.0100.00.00.0100.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-1.50.00.00.0-4.00.00.00.00.00.00.00.00.0-1.30.00.0-3.20.0

us-gaap:GainsLossesOnExtinguishmentOfDebt us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Gains
Period End2021-06-302017-12-312017-09-30
Value-19000000.0-5000000.0-46000000.0
Percentage of GainsLossesOnExtinguishmentOfDebt100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-1.50.0-4.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:CorporateNonSegment0.00.00.0

General And Administrative Expense

us-gaap:GeneralAndAdministrativeExpense

us-gaap:GeneralAndAdministrativeExpense


General
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value68895753887693828794881011051001019793109961051321511261251681711681601391921971521641741661391301201731041303531035108118298
Percentage of GeneralAndAdministrativeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.47.66.97.018.07.47.56.66.37.80.06.67.36.50.08.58.810.20.08.510.120.70.09.411.011.20.05.44.75.40.03.94.24.20.03.33.43.00.02.73.41.70.03.74.11.8

us-gaap:GeneralAndAdministrativeExpense us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


General
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value37642725534055434858435761555954
Percentage of GeneralAndAdministrativeExpense54.471.947.447.260.252.659.152.455.261.748.956.458.155.058.455.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.05.43.33.310.83.94.53.43.54.80.03.74.23.60.04.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:CorporateNonSegment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:GeneralAndAdministrativeExpense us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, mro:InternationalExplorationAndProduction


General
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value4.02.04.03.03.04.05.05.08.07.07.07.09.09.0116.09.06.0
Percentage of GeneralAndAdministrativeExpense5.92.27.05.73.45.35.46.19.27.48.06.98.69.010.96.29.75.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.30.20.50.40.60.40.40.40.60.60.00.50.60.60.00.50.80.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments mro:InternationalExplorationAndProduction6.24.40.07.710.77.40.06.54.45.10.03.74.02.20.01.60.00.0

us-gaap:OperatingSegments, mro:NorthAmericaExplorationAndProduction


General
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value272326253232333431293837353627293033
Percentage of GeneralAndAdministrativeExpense39.725.845.647.236.442.135.541.535.630.943.236.633.336.026.729.932.330.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.22.03.23.36.53.12.72.72.22.40.02.42.42.30.02.62.83.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments mro:NorthAmericaExplorationAndProduction2.32.00.03.56.93.30.02.92.62.70.02.72.93.20.03.80.00.0

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

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value26107-341.0-310.0-765.0-49.0-3.017519327406357140524132-458.0-112.0-16.0-24.0-290.0-238.0-683.0-1001.0-1145.0-392.0-420.0-201.0453511113027637558041367
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.19.1-41.5-40.7-156.1-4.8-0.214.014.02.20.023.29.734.10.0-40.3-10.6-1.50.0-23.6-18.3-93.60.0-86.5-25.6-27.40.015.217.432.00.019.320.633.3

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxExpenseBenefit


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value10.010.0-3.07.0-15.0-3.01710.032-147.0161034416816014141341347-98.0-68.0-276.0-208.0-396.0-6.0-144.0-108.014915159044778710781025130012791025927669898617763796567441513
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.80.8-0.40.9-3.1-0.31.40.82.3-12.20.06.73.010.90.012.43.93.20.0-8.0-5.2-37.80.0-29.9-0.4-9.40.05.05.116.70.020.127.725.00.030.727.122.90.023.616.03.60.019.215.23.1

us-gaap:IncomeTaxExpenseBenefit us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Income
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value-2.00.04.0-4.0-2.0-1.00.012-134.0-4.07118-5.0-11.035
Percentage of IncomeTaxExpenseBenefit-20.0-0.057.126.766.7-5.90.037.591.2-25.068.940.9-3.0-6.924.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.20.00.5-0.8-0.2-0.10.00.9-11.20.04.61.2-0.30.03.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:CorporateNonSegment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:IncomeTaxExpenseBenefit us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, mro:InternationalExplorationAndProduction


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value115.0-4.06.0-5.00.01310.017-11.04630261701701064650
Percentage of IncomeTaxExpenseBenefit110.050.0133.385.733.3-0.076.5100.053.17.5287.529.159.1101.2106.275.2112.2147.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.90.4-0.50.8-1.00.01.10.81.2-0.90.02.01.811.10.09.34.34.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments mro:InternationalExplorationAndProduction16.911.10.015.4-17.90.00.013.09.4-8.00.015.711.541.30.029.10.00.0

us-gaap:OperatingSegments, mro:NorthAmericaExplorationAndProduction


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value1.05.01.0-3.0-6.0-1.05.00.03.0-2.0-26.02.00.03.01.00.00.00.0
Percentage of IncomeTaxExpenseBenefit10.050.0-33.3-42.940.033.329.40.09.41.4-162.51.90.01.80.60.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.40.1-0.4-1.2-0.10.40.00.2-0.20.00.10.00.20.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments mro:NorthAmericaExplorationAndProduction0.10.40.0-0.4-1.3-0.10.00.00.2-0.20.00.10.00.30.00.00.00.0

Income Taxes Paid Net

us-gaap:IncomeTaxesPaidNet

us-gaap:IncomeTaxesPaidNet


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value7.02.0-1.0-54.0-1.05.0224-2.0-120.0-29.0251651231290582815167.04615-3.09.01184716517888345368674414711003151711401489828710832746605729581439406
Percentage of IncomeTaxesPaidNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.60.2-0.1-7.1-0.20.518.2-0.2-8.7-2.40.01.03.515.00.05.12.61.40.00.63.52.10.00.77.73.10.06.030.012.80.019.037.724.40.027.439.320.50.021.919.32.90.019.715.12.4

Interest Paid Net

us-gaap:InterestPaidNet

us-gaap:InterestPaidNet


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value70537649745279120122-52.083538252110761296413266908712557885588529356915699616151635071114146914401439
Percentage of InterestPaidNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.64.59.26.415.15.16.49.68.8-4.30.03.45.73.40.06.712.26.00.05.46.911.90.04.35.73.60.01.83.21.60.01.42.51.50.01.21.71.20.03.00.40.30.01.40.50.2

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1697-338.0-317.0-750.0-46.0-20.016516117439025496356-28.0-599.0-139.0-4957.0-1371.0-192.0-170.0-407.0-793.0-749.0-386.0-276.09264315401149375569426383322450393417549405996996706696709457
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.38.2-41.1-41.7-153.1-4.5-1.613.211.714.50.016.56.623.20.0-52.7-13.1-462.40.0-15.6-13.1-55.80.0-56.6-25.2-18.00.014.518.432.60.014.510.99.30.010.810.410.30.010.725.84.70.023.624.42.7

us-gaap:NetIncomeLoss us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-259.0-165.0-334.0-190.0-379.0-25.0-201.0-58.0-150.0-19.0148-63.0-169.099
Percentage of NetIncomeLoss-1618.8-170.198.859.950.554.31005.0-35.2-93.2-10.937.9-24.8-176.027.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-20.7-14.0-40.6-25.0-77.3-2.4-16.3-4.6-10.9-1.60.0-4.1-11.76.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:CorporateNonSegment0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetIncomeLoss us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, mro:InternationalExplorationAndProduction


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value6850298.0-6.0-1.03343966183116142132
Percentage of NetIncomeLoss425.051.5-8.6-2.50.82.2-165.026.159.635.121.345.7147.937.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.44.23.51.1-1.2-0.12.73.47.05.10.07.59.88.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments mro:InternationalExplorationAndProduction104.6111.10.020.5-21.4-1.90.055.853.044.20.060.762.832.0

us-gaap:OperatingSegments, mro:NorthAmericaExplorationAndProduction


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value207212-33.0-135.0-365.0-20.0148180215132159201123125
Percentage of NetIncomeLoss1293.8218.69.842.648.743.5-740.0109.1133.575.940.879.1128.135.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax16.518.0-4.0-17.7-74.5-2.012.014.415.611.00.013.18.58.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments mro:NorthAmericaExplorationAndProduction17.418.70.0-18.7-79.0-2.10.015.417.912.40.014.910.111.1

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

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Net
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value-6.07.01.0-2.0702.04.0-13.0-5.0
Percentage of NetIncomeLoss1.9-0.9-2.210.042.41.22.3-5.1-5.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.81.40.1-0.25.60.10.3-0.8-0.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.0

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedOtherComprehensiveIncome


Net
Period End2021-06-302021-03-312020-06-302020-03-31
Value-31.01.07.01.0
Percentage of NetIncomeLoss-193.81.0-0.9-2.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-2.50.11.40.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.0

us-gaap:NetIncomeLoss us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

mro:ConsolidatedEquityMethodInvestments


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value85722412-13.0-26.04745
Percentage of NetIncomeLoss531.274.2-7.1-3.81.756.5-235.027.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.86.12.91.6-2.7-2.53.83.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax mro:ConsolidatedEquityMethodInvestments0.00.00.00.00.00.00.00.0

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312011-12-312011-09-30
Value1697-317.0-750.0-46.016516117439025496356-28.0549405
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.38.2-41.7-153.1-4.513.211.714.50.016.56.623.20.00.010.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Operating Income Loss

us-gaap:OperatingIncomeLoss

us-gaap:OperatingIncomeLoss


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value105117-250.0-242.0-703.0157323725571467423205572208-377.0-26.06253-203.0-152.0-598.0-914.0-1070.0-334.0-373.0-143.050858711827271422157514801681178214751394126313339282103195610509221000
Percentage of OperatingIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.49.9-30.4-31.8-143.51.55.919.018.55.90.027.514.237.20.0-33.2-2.55.80.0-16.5-11.7-81.90.0-80.9-21.8-24.30.017.120.033.50.036.340.436.00.042.839.034.50.035.124.010.00.035.531.86.0

us-gaap:OperatingIncomeLoss us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

mro:ConsolidatedEquityMethodInvestments


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value111963719-10.0-30.05861
Percentage of OperatingIncomeLoss105.782.1-14.8-7.91.4-200.079.525.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.98.24.52.5-2.0-2.94.74.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax mro:ConsolidatedEquityMethodInvestments0.00.00.00.00.00.00.00.0

Revenue From Contract With Customer Excluding Assessed Tax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value125411778227614901024123312491381120013801538144715371336113610591072-265.012291302730147513231531153224972971294135293041391438984106423641613784404038093799386521071641742955290316665
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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

us-gaap:OperatingSegments, mro:InternationalExplorationAndProduction


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value6545523928546577181138187191226412367364
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.23.86.35.15.75.35.36.213.111.513.612.415.626.827.532.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.23.86.35.15.75.35.36.213.111.513.612.415.626.827.532.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments mro:InternationalExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, mro:NorthAmericaExplorationAndProduction


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value1189113277072246297011681172120010621193134712211125969772
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax94.896.293.794.994.394.794.793.886.988.586.487.684.473.272.568.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax94.896.293.794.994.394.794.793.886.988.586.487.684.473.272.568.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments mro:NorthAmericaExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService, us-gaap:StatementBusinessSegments

mro:Miscellaneousother, mro:NorthAmericaExplorationAndProduction


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value3110.0222810.02410.010.01623163.07.05.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.50.82.73.72.02.30.80.81.21.91.20.20.50.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.50.82.73.72.02.30.80.81.21.91.20.20.50.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax mro:Miscellaneousother mro:NorthAmericaExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

srt:CrudeOil, mro:NorthAmericaExplorationAndProduction


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value9367915815523618289901017102185992510901013
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax74.667.270.772.573.780.980.381.473.971.667.070.970.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax74.667.270.772.573.780.980.381.473.971.667.070.970.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:CrudeOil mro:NorthAmericaExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

srt:NaturalGasLiquidsReserves, mro:NorthAmericaExplorationAndProduction


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value1311168273375282648477125152115
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.49.910.09.67.65.16.75.16.16.49.19.97.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.49.910.09.67.65.16.75.16.16.49.19.97.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:NaturalGasLiquidsReserves mro:NorthAmericaExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

srt:NaturalGasReserves, mro:NorthAmericaExplorationAndProduction


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value912158569546686817910312710286
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.318.310.39.111.06.47.06.55.78.69.26.65.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.318.310.39.111.06.47.06.55.78.69.26.65.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:NaturalGasReserves mro:NorthAmericaExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService, us-gaap:StatementGeographical, us-gaap:StatementBusinessSegments

mro:Miscellaneousother, country:GQ, mro:InternationalExplorationAndProduction


Revenue
Period End2021-06-302019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value1.0-1.01.00.00.01.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.1-0.10.10.00.00.10.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.1-0.10.10.00.00.10.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax mro:Miscellaneousother country:GQ mro:InternationalExplorationAndProduction100.0100.0100.00.00.0100.00.00.0

mro:Miscellaneousother, mro:EagleFord, mro:NorthAmericaExplorationAndProduction


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value2.02.02.01.01.02.03.01.01.02.05.00.01.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.20.20.20.10.20.20.20.10.10.20.40.00.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.20.20.20.10.20.20.20.10.10.20.40.00.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax mro:Miscellaneousother mro:EagleFord mro:NorthAmericaExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0

mro:Miscellaneousother, mro:OtherU.S., mro:NorthAmericaExplorationAndProduction


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value298.020279.0227.09.01521113.06.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.30.72.43.51.82.10.60.71.11.80.80.20.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.30.72.43.51.82.10.60.71.11.80.80.20.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax mro:Miscellaneousother mro:OtherU.S. mro:NorthAmericaExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

srt:CrudeOil, country:GQ, mro:InternationalExplorationAndProduction


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value58374431204556671014771100100
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.63.15.44.14.14.44.55.47.33.95.16.56.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.63.15.44.14.14.44.55.47.33.95.16.56.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:CrudeOil country:GQ mro:InternationalExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

srt:CrudeOil, mro:Bakken, mro:NorthAmericaExplorationAndProduction


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value411372277230147330409452453372386447405
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax32.831.633.730.230.032.233.236.232.831.028.029.128.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax32.831.633.730.230.032.233.236.232.831.028.029.128.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:CrudeOil mro:Bakken mro:NorthAmericaExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

srt:CrudeOil, mro:EagleFord, mro:NorthAmericaExplorationAndProduction


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value353259191190142307354336350318358436394
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax28.122.023.225.029.030.028.726.925.326.525.928.327.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax28.122.023.225.029.030.028.726.925.326.525.928.327.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:CrudeOil mro:EagleFord mro:NorthAmericaExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

srt:CrudeOil, mro:NorthernDelaware, mro:NorthAmericaExplorationAndProduction


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value77774453337487887764625959
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.16.55.47.06.77.27.17.05.65.34.53.84.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.16.55.47.06.77.27.17.05.65.34.53.84.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:CrudeOil mro:NorthernDelaware mro:NorthAmericaExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

srt:CrudeOil, mro:OtherU.S., mro:NorthAmericaExplorationAndProduction


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value242215147.03319253028333444
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.91.91.81.81.43.21.52.02.22.32.42.23.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.91.91.81.81.43.21.52.02.22.32.42.23.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:CrudeOil mro:OtherU.S. mro:NorthAmericaExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

srt:CrudeOil, stpr:OK, mro:NorthAmericaExplorationAndProduction


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value7161546532841211161117786114111
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.75.26.68.56.58.29.89.38.06.46.27.47.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.75.26.68.56.58.29.89.38.06.46.27.47.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:CrudeOil stpr:OK mro:NorthAmericaExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

srt:NaturalGasLiquidsReserves, mro:Bakken, mro:NorthAmericaExplorationAndProduction


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value484126153.010.0156.01510.0111917
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.83.53.22.00.61.01.20.51.10.80.81.21.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.83.53.22.00.61.01.20.51.10.80.81.21.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:NaturalGasLiquidsReserves mro:Bakken mro:NorthAmericaExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

srt:NaturalGasLiquidsReserves, mro:EagleFord, mro:NorthAmericaExplorationAndProduction


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value33262122161626233035487045
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.62.22.62.93.31.62.11.82.22.93.54.63.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.62.22.62.93.31.62.11.82.22.93.54.63.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:NaturalGasLiquidsReserves mro:EagleFord mro:NorthAmericaExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

srt:NaturalGasLiquidsReserves, mro:NorthernDelaware, mro:NorthAmericaExplorationAndProduction


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value119.06.07.04.03.06.05.07.08.014126.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.90.80.70.90.80.30.50.40.50.71.00.80.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.90.80.70.90.80.30.50.40.50.71.00.80.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:NaturalGasLiquidsReserves mro:NorthernDelaware mro:NorthAmericaExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

srt:NaturalGasLiquidsReserves, mro:OtherU.S., mro:NorthAmericaExplorationAndProduction


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value2.03.02.01.01.02.00.02.01.02.01.03.02.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.20.30.20.10.20.20.00.20.10.20.10.20.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.20.30.20.10.20.20.00.20.10.20.10.20.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:NaturalGasLiquidsReserves mro:OtherU.S. mro:NorthAmericaExplorationAndProduction100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0

srt:NaturalGasLiquidsReserves, stpr:OK, mro:NorthAmericaExplorationAndProduction


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value37372728132135283122514845
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.03.13.33.72.72.12.82.22.21.83.73.13.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.03.13.33.72.72.12.82.22.21.83.73.13.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:NaturalGasLiquidsReserves stpr:OK mro:NorthAmericaExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

srt:NaturalGasReserves, country:GQ, mro:InternationalExplorationAndProduction


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value5.07.07.07.07.08.08.08.09.07.09.09.010.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.40.60.90.91.40.80.60.60.70.60.70.60.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.40.60.90.91.40.80.60.60.70.60.70.60.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:NaturalGasReserves country:GQ mro:InternationalExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

srt:NaturalGasReserves, mro:Bakken, mro:NorthAmericaExplorationAndProduction


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value1725129.05.08.0138.06.012119.08.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.42.11.51.21.00.81.10.60.41.00.80.60.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.42.11.51.21.00.81.10.60.41.00.80.60.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:NaturalGasReserves mro:Bakken mro:NorthAmericaExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

srt:NaturalGasReserves, mro:EagleFord, mro:NorthAmericaExplorationAndProduction


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value29472418202327283234433633
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.34.02.92.44.12.22.22.22.32.83.12.32.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.34.02.92.44.12.22.22.22.32.83.12.32.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:NaturalGasReserves mro:EagleFord mro:NorthAmericaExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

srt:NaturalGasReserves, mro:NorthernDelaware, mro:NorthAmericaExplorationAndProduction


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value5.0255.06.04.03.06.03.01.06.07.06.02.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.42.10.60.80.80.30.50.20.10.50.50.40.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.42.10.60.80.80.30.50.20.10.50.50.40.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:NaturalGasReserves mro:NorthernDelaware mro:NorthAmericaExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

srt:NaturalGasReserves, mro:OtherU.S., mro:NorthAmericaExplorationAndProduction


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-1.09.03.03.01.03.02.05.04.06.09.05.05.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.10.80.40.40.20.30.20.40.30.50.70.30.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.10.80.40.40.20.30.20.40.30.50.70.30.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:NaturalGasReserves mro:OtherU.S. mro:NorthAmericaExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

srt:NaturalGasReserves, stpr:OK, mro:NorthAmericaExplorationAndProduction


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value411094133242938373645574638
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.39.35.04.34.92.83.13.02.63.84.13.02.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.39.35.04.34.92.83.13.02.63.84.13.02.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:NaturalGasReserves stpr:OK mro:NorthAmericaExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:StatementBusinessSegments

mro:NorthAmericaExplorationAndProduction


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1189113277072246297011681172120010621193134712211125
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax94.896.293.794.994.394.794.793.886.988.586.487.684.473.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax94.896.293.794.994.394.794.793.886.988.586.487.684.473.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax mro:NorthAmericaExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:StatementGeographical, us-gaap:StatementBusinessSegments

country:GQ, mro:InternationalExplorationAndProduction


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value65455239285464771115582110111
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.23.86.35.15.75.35.26.28.04.65.97.27.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.23.86.35.15.75.35.26.28.04.65.97.27.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax country:GQ mro:InternationalExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mro:Bakken, mro:NorthAmericaExplorationAndProduction


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value476438315254155348437466474394408475430
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax38.037.238.333.431.634.035.437.334.332.829.630.929.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax38.037.238.333.431.634.035.437.334.332.829.630.929.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax mro:Bakken mro:NorthAmericaExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mro:EagleFord, mro:NorthAmericaExplorationAndProduction


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value417334238231179348410388413389454542473
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax33.328.429.030.436.534.033.331.129.932.432.935.232.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax33.328.429.030.436.534.033.331.129.932.432.935.232.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax mro:EagleFord mro:NorthAmericaExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mro:NorthernDelaware, mro:NorthAmericaExplorationAndProduction


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value931115566418099968578837767
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.49.46.78.78.47.88.07.76.26.56.05.04.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.49.46.78.78.47.88.07.76.26.56.05.04.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax mro:NorthernDelaware mro:NorthAmericaExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mro:OtherU.S., mro:NorthAmericaExplorationAndProduction


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value54424045186028415057544557
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.33.64.95.93.75.92.33.33.64.83.92.93.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.33.64.95.93.75.92.33.33.64.83.92.93.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax mro:OtherU.S. mro:NorthAmericaExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

stpr:OK, mro:NorthAmericaExplorationAndProduction


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value14920712212669134194181178144194208194
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.917.614.816.614.113.115.714.512.912.014.113.513.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.917.614.816.614.113.115.714.512.912.014.113.513.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax stpr:OK mro:NorthAmericaExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Revenues

us-gaap:Revenues

us-gaap:Revenues


Revenues
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value114310718227542721230123313451433119717651667141717331382125210591072138912291302730147513231531153224972971294135293041391438984106423641613784404038093799386521071641742955290316665
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax91.191.0100.099.155.5120.1100.0107.7103.899.8127.9108.497.9112.8103.4110.2100.0100.0-524.2100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Revenues us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

mro:ConsolidatedEquityMethodInvestments


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value246235163140111172195184
Percentage of Revenues21.521.919.818.640.814.015.813.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax19.620.019.818.422.716.815.814.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax mro:ConsolidatedEquityMethodInvestments0.00.00.00.00.00.00.00.0

Assets

us-gaap:Assets

us-gaap:Assets


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value1780018233179561866318567197152024520373212822141021321217782187121634220122294724241245373109432310325273286832311346743577034736360113670035935361513562035776350483510935306345583225031851313713054130490518655001447052
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Assets us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value10061238812116363285793464883012391917948
Percentage of Assets5.76.84.56.23.44.34.63.23.95.89.04.3
Percentage of Assets5.76.84.56.23.44.34.63.23.95.89.04.3
Percentage of Assets us-gaap:CorporateNonSegment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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

us-gaap:OperatingSegments, mro:InternationalExplorationAndProduction


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value104710461081110411441405153020032913266820834201
Percentage of Assets5.95.76.05.96.27.17.69.813.712.59.819.1
Percentage of Assets5.95.76.05.96.27.17.69.813.712.59.819.1
Percentage of Assets us-gaap:OperatingSegments mro:InternationalExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, mro:NorthAmericaExplorationAndProduction


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value157471594916063163961679117453177811772217539175031732116863
Percentage of Assets88.587.589.587.990.488.587.887.082.481.881.276.6
Percentage of Assets88.587.589.587.990.488.587.887.082.481.881.276.6
Percentage of Assets us-gaap:OperatingSegments mro:NorthAmericaExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Liabilities

us-gaap:Liabilities

us-gaap:Liabilities


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value71667562739577717392775780928102918192029193973497399600103041117211836119531355313388133741351713758153391555214076149911647416067163461627616782160271652117023164941446514345142121378513783271602624325142
Percentage of Liabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets40.341.541.241.639.839.340.039.843.143.043.144.744.544.446.848.748.848.743.641.441.141.142.644.243.540.541.644.944.745.245.746.945.747.148.247.744.945.045.345.145.252.452.553.4

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:LiabilitiesAndStockholdersEquity


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value1780018233179561866318567197152024520373212822141021321217782187121634220122294724241245373109432310325273286832311346743577034736360113670035935361513562035776350483510935306345583225031851313713054130490518655001447052
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-31
Value10634106711056110892111751195812153122711210112208121281204412132120341170811775124051258417541189221915319351185531933521020182831806417785174991715223771
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets59.758.558.858.460.260.760.060.256.957.056.955.355.555.653.251.351.251.356.458.658.958.957.455.858.451.852.355.154.954.747.5

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-31
Value7711273573783105112505963-21.0-41.0-58.0-62.0-54.0-83.0
Percentage of StockholdersEquity0.71.00.70.50.30.70.90.90.40.50.5-0.2-0.3-0.5-0.5-0.5-0.5
Percentage of Assets0.40.60.40.30.20.40.50.50.20.30.3-0.1-0.2-0.3-0.3-0.2-0.3
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-31
Value72017195717471597143710272077197717071497238722672277237737973677446
Percentage of StockholdersEquity67.767.467.965.763.959.459.358.759.358.659.760.059.660.163.062.642.4
Percentage of Assets40.539.540.038.438.536.035.635.333.733.433.933.233.033.533.532.123.9
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-31
Value652465406466682871457895799380537928780877067357714670936779684912672
Percentage of StockholdersEquity61.461.361.262.763.966.065.865.665.564.063.561.158.958.957.958.272.2
Percentage of Assets36.735.936.036.638.540.039.539.537.336.536.133.832.732.830.829.840.8
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TreasuryStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-31
Value-4105.0-4113.0-4089.0-4089.0-4087.0-4059.0-4089.0-4028.0-3984.0-3745.0-3816.0-3455.0-3137.0-3175.0-3325.0-3324.0-3431.0
Percentage of StockholdersEquity-38.6-38.5-38.7-37.5-36.6-33.9-33.6-32.8-32.9-30.7-31.5-28.7-25.9-26.4-28.4-28.2-19.6
Percentage of Assets-23.1-22.6-22.8-21.9-22.0-20.6-20.2-19.8-18.7-17.5-17.9-15.9-14.3-14.7-15.1-14.5-11.0
Percentage of Assets us-gaap:TreasuryStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Assets Current

us-gaap:AssetsCurrent

us-gaap:AssetsCurrent


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value20752150161219221405190921352520268827762921306530872902256636904424374336653042375432682590385841302968459342044218478729753455328137773762403732543445322471547314157751382910637
Percentage of AssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets11.711.89.010.37.69.710.512.412.613.013.714.114.113.411.716.118.315.311.89.411.59.98.011.111.58.512.811.511.713.28.49.79.410.810.711.710.110.810.323.424.030.427.722.6

us-gaap:AssetsCurrent us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

mro:ConsolidatedEquityMethodInvestments


Assets
Period End2020-12-312019-12-31
Value389455
Percentage of AssetsCurrent24.121.3
Percentage of Assets2.22.2
Percentage of Assets mro:ConsolidatedEquityMethodInvestments0.00.0

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashAndCashEquivalentsAtCarryingValue


Cash
Period End2020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value742522817858116596110191462156416671613563179526142490249019532584207212211680157211262398761116919642643542467686846714525134934633471157163951164320622718205712851199
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets4.12.84.14.25.74.54.86.97.27.67.52.67.810.810.18.06.07.96.33.84.84.43.26.72.13.35.40.71.00.72.21.91.91.41.61.615.215.511.07.90.00.00.04.40.00.0

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents


Cash
Period End2020-12-312019-12-312018-12-312017-12-31
Value7428581462563
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0
Percentage of Assets4.14.26.92.6

Accounts Receivable Net Current

us-gaap:AccountsReceivableNetCurrent

us-gaap:AccountsReceivableNetCurrent


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value84176174750262070311221148114410861079133511761100108294576775187778382277991299111951341172920482042222221342562244324662389255320472198191716961790649859724677
Percentage of AccountsReceivableNetCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets4.74.24.22.73.33.65.55.65.45.15.16.15.45.14.94.13.23.12.82.42.52.42.82.93.33.94.85.65.76.16.07.27.07.06.87.46.36.96.15.65.912.511.99.9

Receivables Net Current

us-gaap:ReceivablesNetCurrent

us-gaap:ReceivablesNetCurrent


Receivables
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value10089217476431122
Percentage of ReceivablesNetCurrent100.0100.0100.0100.0100.0
Percentage of Assets5.75.14.23.45.5

Inventory Net

us-gaap:InventoryNet

us-gaap:InventoryNet


Inventory
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value7878767777787271728396110117110126132140145227221272306313324336379357379404405364360368368361324335296361342343308834533622
Percentage of InventoryNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.40.40.40.40.40.40.40.30.30.40.50.50.50.50.60.60.60.60.70.70.80.91.00.90.91.11.01.01.11.11.01.01.01.01.00.91.00.91.21.11.16.06.97.7

Other Assets Current

us-gaap:OtherAssetsCurrent

us-gaap:OtherAssetsCurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value19264783107118831361011602573192663662160134718576111144163102122109143211196213179224175301269215233223458417414395221
Percentage of OtherAssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.10.10.30.40.60.60.40.70.50.71.20.10.40.30.20.30.70.50.20.30.20.30.40.50.30.40.30.40.60.50.60.50.60.50.90.80.70.70.71.51.40.80.80.5

Noncurrent Assets

us-gaap:NoncurrentAssets

us-gaap:NoncurrentAssets


Noncurrent
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value16085176631754918512266492806430153293462955126707
Percentage of NoncurrentAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets89.687.282.384.185.786.983.782.483.785.1

us-gaap:NoncurrentAssets us-gaap:StatementGeographical

country:GQ


Noncurrent
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value86111561333158217941917194919772081
Percentage of NoncurrentAssets5.46.57.68.56.76.86.56.77.0
Percentage of Assets4.85.76.37.25.85.95.45.65.9
Percentage of Assets country:GQ0.00.00.00.00.00.00.00.00.0

country:US


Noncurrent
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value152241650716094159711427215353165181463513677
Percentage of NoncurrentAssets94.693.591.786.353.654.754.849.946.3
Percentage of Assets84.881.575.572.645.947.545.941.138.7
Percentage of Assets country:US0.00.00.00.00.00.00.00.00.0

Assets Noncurrent

us-gaap:AssetsNoncurrent us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:AssetsNoncurrent

mro:ConsolidatedEquityMethodInvestments


Assets
Period End2020-12-312019-12-31
Value9411049
Percentage of AssetsNoncurrent100.0100.0
Percentage of Assets5.25.2
Percentage of Assets mro:ConsolidatedEquityMethodInvestments0.00.0

Property Plant And Equipment Gross

us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType

us-gaap:PropertyPlantAndEquipmentGross

us-gaap:PropertyPlantAndEquipmentOtherTypes


Property
Period End2020-12-312019-12-31
Value16461624
Percentage of PropertyPlantAndEquipmentGross100.0100.0
Percentage of Assets9.28.0
Percentage of Assets us-gaap:PropertyPlantAndEquipmentOtherTypes0.00.0

us-gaap:WellsAndRelatedEquipmentAndFacilities


Property
Period End2020-12-312019-12-31
Value682670
Percentage of PropertyPlantAndEquipmentGross41.441.3
Percentage of Assets3.83.3
Percentage of Assets us-gaap:WellsAndRelatedEquipmentAndFacilities0.00.0

Accumulated Depreciation Depletion And Amortization Property Plant And Equipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value2136420810203581978219216186411800317366172601766921830223582233621872215642166921238206922221421775216592276323260237132339522648218842102420207223362189521171206392019519266184381777717184172481673116243206921980517185
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets120.0114.1113.4106.0103.594.688.985.281.182.5102.4102.7102.1101.198.094.487.684.371.467.466.669.372.068.465.465.260.857.356.261.861.559.258.957.554.653.455.154.055.054.853.339.939.636.5

Property Plant And Equipment Net

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:PropertyPlantAndEquipmentNet


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value1501915313156381602916424169031700016717167301671416804168991688116931176651764518337165332571825976256572673727061279202912129291290402865827824284262814527822274572838228272274462600125365253242031820140321893222232121
Percentage of PropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets84.484.087.185.988.585.784.082.178.678.178.877.677.278.380.376.975.667.482.780.478.981.383.880.581.484.380.678.177.478.679.077.878.380.880.179.480.679.680.766.566.162.164.468.3

us-gaap:PropertyPlantAndEquipmentNet us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value56646872768080787880838388
Percentage of PropertyPlantAndEquipmentNet0.40.40.40.40.50.50.50.50.50.50.50.50.5
Percentage of Assets0.30.40.40.40.40.40.40.40.40.40.40.40.4
Percentage of Assets us-gaap:CorporateNonSegment5.65.28.46.212.09.38.612.09.46.54.30.09.3

us-gaap:PropertyPlantAndEquipmentNet us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, mro:InternationalExplorationAndProduction


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value3803964144244494714935125405667108051710
Percentage of PropertyPlantAndEquipmentNet2.52.62.62.62.72.82.93.13.23.44.24.89.7
Percentage of Assets2.12.22.32.32.42.42.42.52.52.63.33.77.8
Percentage of Assets us-gaap:OperatingSegments mro:InternationalExplorationAndProduction36.337.938.338.439.233.532.225.618.521.234.10.040.7

us-gaap:OperatingSegments, mro:NorthAmericaExplorationAndProduction


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value14583148531515615533158991635216427161271611216068160111601115867
Percentage of PropertyPlantAndEquipmentNet97.197.096.996.996.896.796.696.596.396.195.394.789.8
Percentage of Assets81.981.584.483.285.682.981.179.275.775.075.173.572.1
Percentage of Assets us-gaap:OperatingSegments mro:NorthAmericaExplorationAndProduction92.693.194.494.794.793.792.491.091.991.892.40.094.1

Operating Lease Right Of Use Asset

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OperatingLeaseRightOfUseAsset


Operating
Period End2021-06-302021-03-312020-12-312020-09-302019-12-312019-09-302019-06-302019-03-312019-01-01
Value92112133137199226248247156
Percentage of OperatingLeaseRightOfUseAsset100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.50.60.70.71.01.11.21.20.0

Other Assets Noncurrent

us-gaap:OtherAssetsNoncurrent

us-gaap:OtherAssetsNoncurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value248310259245262275352374420440723912860849764607543698665224620571789154214271015918806988108812162800278425671118146812311151116390411011024679781902
Percentage of OtherAssetsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.41.71.41.31.41.41.71.82.02.13.44.23.93.93.52.62.22.82.17.06.35.44.84.12.82.62.22.73.03.47.97.87.33.24.23.63.63.72.93.63.41.31.61.9

Accounts Payable Current

us-gaap:AccountsPayableCurrent

us-gaap:AccountsPayableCurrent


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value9379188377306961104130713741401131013201479142813351395131311581081107896495310841313124615071854254524302439238222062406215222842285233521582029186415481631834180006982
Percentage of AccountsPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets5.35.04.73.93.75.66.56.76.66.16.26.86.56.26.35.74.84.43.53.02.93.34.13.64.25.37.16.66.86.66.26.76.16.56.56.86.76.45.95.15.316.116.014.8

Accrued Income Taxes Current

us-gaap:AccruedIncomeTaxesCurrent

us-gaap:AccruedIncomeTaxesCurrent


Accrued
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value957872457772118867714918112899128177162788194668515113214315626028518119314761445151113971892198720271440206520151904183917441447547
Percentage of AccruedIncomeTaxesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.50.40.40.20.40.40.60.40.40.70.80.60.50.60.80.70.30.30.30.20.30.50.40.40.40.70.80.50.54.14.14.24.05.45.65.94.56.56.46.26.03.42.91.2

Liabilities Current

us-gaap:LiabilitiesCurrent

us-gaap:LiabilitiesCurrent


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value1575189912131566106514421745237924711858183221422044190919681762208230992240140813821526172928483052356143794176397443144333467340084629508167824691467343944125416111782111139057
Percentage of LiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets8.810.46.88.45.77.38.611.711.68.78.69.89.38.88.97.78.612.67.24.44.24.65.48.28.510.312.211.411.111.912.213.111.413.214.419.614.514.714.013.513.622.722.219.2

us-gaap:LiabilitiesCurrent us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

mro:ConsolidatedEquityMethodInvestments


Liabilities
Period End2020-12-312019-12-31
Value235284
Percentage of LiabilitiesCurrent19.416.3
Percentage of Assets1.31.4
Percentage of Assets mro:ConsolidatedEquityMethodInvestments0.00.0

Long Term Debt Current

us-gaap:LongTermDebtCurrent

us-gaap:LongTermDebtCurrent


Long
Period End2021-06-302021-03-312020-09-30
Value33500500
Percentage of LongTermDebtCurrent100.0100.0100.0
Percentage of Assets0.22.72.7

us-gaap:LongTermDebtCurrent us-gaap:DebtInstrument

mro:AggregateMaximumTender


Long
Period End2020-09-30
Value500
Percentage of LongTermDebtCurrent100.0
Percentage of Assets2.7
Percentage of Assets mro:AggregateMaximumTender0.0

Operating Lease Liability Current

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OperatingLeaseLiabilityCurrent


Operating
Period End2021-06-302021-03-312020-12-312020-09-302019-12-312019-09-302019-06-302019-03-31
Value5262707910110410492
Percentage of OperatingLeaseLiabilityCurrent100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.30.30.40.40.50.50.50.4

Other Liabilities Current

us-gaap:OtherLiabilitiesCurrent

us-gaap:OtherLiabilitiesCurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value461366247219216198208227216220170405405359288188206222253256229211150286235252290184147208239326254203188206211207158192193593580566
Percentage of OtherLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.62.01.41.21.21.01.01.11.01.00.81.91.91.71.30.80.80.90.80.80.70.60.50.80.70.70.80.50.40.60.70.90.70.60.50.60.70.60.50.60.61.11.21.2

Liabilities Noncurrent

us-gaap:LiabilitiesNoncurrent us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:LiabilitiesNoncurrent

mro:ConsolidatedEquityMethodInvestments


Liabilities
Period End2020-12-312019-12-31
Value170183
Percentage of LiabilitiesNoncurrent100.0100.0
Percentage of Assets0.90.9
Percentage of Assets mro:ConsolidatedEquityMethodInvestments0.00.0

Long Term Debt

us-gaap:LongTermDebt

us-gaap:LongTermDebt


Long
Period End2020-12-312019-12-31
Value54045501
Percentage of LongTermDebt100.0100.0
Percentage of Assets30.127.2

Long Term Debt Noncurrent

us-gaap:LongTermDebtNoncurrent

us-gaap:LongTermDebtNoncurrent


Long
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value48754905540454055501
Percentage of LongTermDebtNoncurrent100.0100.0100.0100.0100.0
Percentage of Assets27.426.930.129.027.2

Long Term Debt And Capital Lease Obligations

us-gaap:LongTermDebtAndCapitalLeaseObligations

us-gaap:LongTermDebtAndCapitalLeaseObligations


Long
Period End2020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value54045503550255014903490255015499549854975495549464886715572365897277728072807276732373215326532363556362639263946433642864766512451845134559467447054684799276018436
Percentage of LongTermDebtAndCapitalLeaseObligations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets30.129.627.927.224.123.025.725.825.225.125.425.028.327.723.321.222.522.422.122.521.120.515.314.817.317.717.718.018.018.318.418.413.114.014.314.915.415.415.415.217.9

Deferred Income Tax Liabilities Net

us-gaap:DeferredIncomeTaxLiabilitiesNet

us-gaap:DeferredIncomeTaxLiabilitiesNet


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value156160163184171185186183184192199215237221833769
Percentage of DeferredIncomeTaxLiabilitiesNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.90.90.91.00.90.90.90.90.90.90.91.01.11.03.82.5

Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent

country:US, us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Pension
Period End2020-12-312019-12-31
Value7071
Percentage of PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent100.0100.0
Percentage of Assets0.40.4
Percentage of Assets country:US us-gaap:OtherPostretirementBenefitPlansDefinedBenefit0.00.0

country:US, us-gaap:PensionPlansDefinedBenefit


Pension
Period End2020-12-312019-12-31
Value110112
Percentage of PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent157.1157.7
Percentage of Assets0.60.6
Percentage of Assets country:US us-gaap:PensionPlansDefinedBenefit0.00.0

Operating Lease Liability Noncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent


Operating
Period End2021-06-302021-03-312020-12-312020-09-302019-12-312019-09-302019-06-302019-03-31
Value44586761107127151162
Percentage of OperatingLeaseLiabilityNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.20.30.40.30.50.60.70.8

Lessee Operating Lease Liability Payments Due Year Two

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo


Lessee
Period End2020-12-31
Value44
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo100.0
Percentage of Assets0.2

Lessee Operating Lease Liability Payments Due Year Three

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree


Lessee
Period End2020-12-31
Value11
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearThree100.0
Percentage of Assets0.1

Lessee Operating Lease Liability Payments Due Year Four

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour


Lessee
Period End2020-12-31
Value5000000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFour100.0
Percentage of Assets0.0

Lessee Operating Lease Liability Payments Due Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive


Lessee
Period End2020-12-31
Value4000000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFive100.0
Percentage of Assets0.0

Lessee Operating Lease Liability Payments Due After Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive


Lessee
Period End2020-12-31
Value2000000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive100.0
Percentage of Assets0.0

Operating Lease Liability

us-gaap:OperatingLeaseLiability

us-gaap:OperatingLeaseLiability


Operating
Period End2020-12-312019-03-312019-01-01
Value137254160
Percentage of OperatingLeaseLiability100.0100.0100.0
Percentage of Assets0.81.20.0

Lessee Operating Lease Liability Payments Due

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue


Lessee
Period End2020-12-31
Value143
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue100.0
Percentage of Assets0.8

Lessee Operating Lease Liability Undiscounted Excess Amount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount


Lessee
Period End2020-12-31
Value6000000.0
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount100.0
Percentage of Assets0.0

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-31
Value10634106711056110892111751195812153122711210112208121281204412132120341170811775124051258417541189221915319351185531933521020182831806417785174991715223771
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets59.758.558.858.460.260.760.060.256.957.056.955.355.555.653.251.351.251.356.458.658.958.957.455.858.451.852.355.154.954.747.5

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-31
Value7711273573783105112505963-21.0-41.0-58.0-62.0-54.0-83.0
Percentage of StockholdersEquity0.71.00.70.50.30.70.90.90.40.50.5-0.2-0.3-0.5-0.5-0.5-0.5
Percentage of Assets0.40.60.40.30.20.40.50.50.20.30.3-0.1-0.2-0.3-0.3-0.2-0.3
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-31
Value72017195717471597143710272077197717071497238722672277237737973677446
Percentage of StockholdersEquity67.767.467.965.763.959.459.358.759.358.659.760.059.660.163.062.642.4
Percentage of Assets40.539.540.038.438.536.035.635.333.733.433.933.233.033.533.532.123.9
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-31
Value652465406466682871457895799380537928780877067357714670936779684912672
Percentage of StockholdersEquity61.461.361.262.763.966.065.865.665.564.063.561.158.958.957.958.272.2
Percentage of Assets36.735.936.036.638.540.039.539.537.336.536.133.832.732.830.829.840.8
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TreasuryStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-31
Value-4105.0-4113.0-4089.0-4089.0-4087.0-4059.0-4089.0-4028.0-3984.0-3745.0-3816.0-3455.0-3137.0-3175.0-3325.0-3324.0-3431.0
Percentage of StockholdersEquity-38.6-38.5-38.7-37.5-36.6-33.9-33.6-32.8-32.9-30.7-31.5-28.7-25.9-26.4-28.4-28.2-19.6
Percentage of Assets-23.1-22.6-22.8-21.9-22.0-20.6-20.2-19.8-18.7-17.5-17.9-15.9-14.3-14.7-15.1-14.5-11.0
Percentage of Assets us-gaap:TreasuryStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Stockholders Equity Including Portion Attributable To Noncontrolling Interest

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest


Stockholders
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-312007-12-31
Value10561121531212811708175411855320218206602102020226198681980519344189941902118588182831806417785175061715916756167072470523771219102140919223
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets58.860.056.953.256.457.456.559.558.455.155.354.854.353.154.352.951.852.355.155.054.754.954.847.647.546.60.00.0

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value7310563-62.0-83.0-135.0-277.0-250.0-433.0-370.0-997.0
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest0.70.90.5-0.5-0.5-0.7-1.3-1.3-2.4-2.2-4.2
Percentage of Assets0.40.50.3-0.3-0.3-0.4-0.8-0.7-1.2-1.2-2.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312011-09-302011-06-302010-12-312009-12-312008-12-312007-12-31
Value7174720772387379744664986531659266166680667567236756673866966679
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest67.959.359.763.042.435.031.134.136.238.939.840.228.430.831.334.7
Percentage of Assets40.035.633.933.523.920.118.118.518.721.321.922.013.514.30.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


Stockholders
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312011-09-302011-06-302010-12-312009-12-312008-12-312007-12-31
Value937937937937937770770770770770770770770769767765
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest8.97.77.78.05.34.23.74.04.24.54.64.63.23.53.64.0
Percentage of Assets5.24.64.44.33.02.42.12.22.22.52.52.51.51.60.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312011-09-302011-06-302010-12-312009-12-312008-12-312007-12-31
Value6466799377066779126721497417638151351389012788123521205319907180431725914412
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest61.265.863.557.972.280.783.978.276.074.573.772.183.782.480.675.0
Percentage of Assets36.039.536.130.840.846.349.042.539.340.840.439.539.838.30.00.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TreasuryStock


Stockholders
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312011-09-302011-06-302010-12-312009-12-312008-12-312007-12-31
Value-4089.0-4089.0-3816.0-3325.0-3431.0-3554.0-3642.0-2903.0-2560.0-2716.0-2721.0-2493.0-2665.0-2706.0-2720.0-2384.0
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest-38.7-33.6-31.5-28.4-19.6-19.2-17.3-15.0-14.0-15.8-16.2-14.9-11.2-12.4-12.7-12.4
Percentage of Assets-22.8-20.2-17.9-15.1-11.0-11.0-10.1-8.1-7.3-8.7-8.9-8.2-5.3-5.80.00.0
Percentage of Assets us-gaap:TreasuryStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value937937937937937937937937937937937937937937937937937937937937937937770770770770770770770770770770770770770770770770770770770770770769
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets5.35.15.25.05.04.84.64.64.44.44.44.34.34.34.34.13.93.83.02.92.92.92.42.22.22.22.12.12.12.12.22.22.22.22.22.22.42.42.52.52.51.51.51.6

Additional Paid In Capital

us-gaap:AdditionalPaidInCapital

us-gaap:AdditionalPaidInCapital


Additional
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value72017195717471597143710272077197717071497238722672277237737973677349733674467442743374286498649364846532653165236530659965926603661466186616663466676658668066756723676367566738
Percentage of AdditionalPaidInCapital100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets40.539.540.038.438.536.035.635.333.733.433.933.233.033.533.532.130.329.923.923.022.922.620.118.718.118.818.117.818.218.318.518.518.918.818.719.220.720.921.321.922.013.013.514.3

Retained Earnings Accumulated Deficit

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:RetainedEarningsAccumulatedDeficit


Retained
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value6524654064666828714578957993805379287808770673577146709367796849749176731267214086143201453314974158001669117220176381685416564161511513514892144581415313890136881335813084127881235212053207251990718043
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets36.735.936.036.638.540.039.539.537.336.536.133.832.732.830.829.830.931.340.843.644.044.246.345.646.749.649.045.946.144.742.541.641.340.339.339.641.441.140.840.439.540.039.838.3

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value7711273573783105112505963-21.0-41.0-58.0-62.0-54.0-54.0-48.0-83.0-137.0-140.0-150.0-135.0-175.0-172.0-228.0-277.0-277.0-278.0-270.0-250.0-322.0-344.0-426.0-433.0-421.0-364.0-361.0-370.0-328.0-346.0-971.0-997.0-934.0
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 Assets0.40.60.40.30.20.40.50.50.20.30.3-0.1-0.2-0.3-0.3-0.2-0.2-0.2-0.3-0.4-0.4-0.5-0.4-0.5-0.5-0.7-0.8-0.8-0.8-0.7-0.7-0.9-1.0-1.2-1.2-1.2-1.1-1.1-1.2-1.1-1.1-1.9-2.0-2.0

Treasury Stock Value

us-gaap:TreasuryStockValue

us-gaap:TreasuryStockValue


Treasury
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value41054113408940894087405940894028398437453816345531373175332533243318331434313406339733973554355335553634364236443718344529032949247725272560260726462652271627212493258226652706
Percentage of TreasuryStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets23.122.622.821.922.020.620.219.818.717.517.915.914.314.715.114.513.713.511.010.510.410.311.010.29.910.510.19.910.39.58.18.27.17.27.37.58.28.38.78.98.25.05.35.8

Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue


Adjustments
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value5.0111421-22.01816-50.06.06.05.0-49.0
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Adjustments
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value5.0111421-22.01816-50.06.06.05.0-49.0
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value6556224183459.0701700737797515855352496408309115517741088147012291645868152812051070769973103410801818259228858611278849
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax52.252.850.945.31.868.556.859.057.742.962.023.937.526.620.246.359.737.041.740.442.022.337.228.425.720.324.127.128.447.012.34.529.144.05.1

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-256.0-207.0-243.0-145.0-304.0-611.0-894.0-795.0-565.0-564.0-549.0258-247.0-1771.0-1442.02.0-1544.0-1252.01048-1110.0-1112.0-1262.0-1037.0-1408.0-2030.0-1195.0-806.0-5056.0-738.0-1040.0-833.0-365.0-1114.0-1132.0-10.0
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-20.4-17.6-29.6-19.1-62.0-59.7-72.5-63.7-40.9-47.0-39.817.5-18.7-115.7-94.10.1-52.0-42.629.7-36.5-28.4-32.4-25.3-33.2-48.8-31.6-20.0-132.7-19.4-26.9-4.0-0.6-37.7-39.0-0.1

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-554.0-32.0-552.03970.0-131.0-113.0-72.0-278.0-72.0-404.0-377.0-29.0-49.0-1043.0-864.0-46.0-50.0-37.0-44.0-43.01198-1068.0-139.01807-138.0-173.0-77.0-533.0-810.0-208.0-411.0-130.0-413.02151175367-157.0-113.0-403.0-1781.02.0-212.0-176.0-798.0-172.0
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-44.2-2.7-67.252.20.0-12.8-9.2-5.8-20.1-6.0-29.3-24.5-2.0-3.2-78.1-76.1-4.3-4.714.0-3.6-3.3164.1-72.4-10.5118.0-9.0-6.9-2.6-18.1-23.0-6.8-10.5-3.3-10.15.128.29.7-3.9-3.0-10.6-46.10.0-0.3-6.0-27.5-1.0

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-155.0383-377.0597-295.0-41.0-307.0-131.0-46.0-120.0
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-12.432.5-45.978.4-60.2-4.0-24.9-10.5-3.3-10.0

Deferred Income Tax Expense Benefit

us-gaap:DeferredIncomeTaxExpenseBenefit

us-gaap:DeferredIncomeTaxExpenseBenefit


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-3.0-4.0-20.012-13.0-1.00.0-1.0-2.0-31.0-10.06825-31.0-105.06.024141315-112.0-72.0-320.0-216.0-405.0-6.0-179.0-249.016468105-77.0-96.06944-183.0-102.097-22.0-107.0352-185.0-242.0-189.0-132.0-254.0-25.0
Percentage of DeferredIncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Depreciation Depletion And Amortization

us-gaap:DepreciationDepletionAndAmortization

us-gaap:DepreciationDepletionAndAmortization


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value5324965215545976446166226055546136266125905836415925566315945616096687177518218017376806975857207387476996255805745505175648521589530416649
Percentage of DepreciationDepletionAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DepreciationDepletionAndAmortization us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value8.05.06.05.06.06.06.08.06.06.07.06.06.08.08.08.0
Percentage of DepreciationDepletionAndAmortization1.51.01.20.91.00.91.01.31.01.11.11.01.01.41.41.2

us-gaap:DepreciationDepletionAndAmortization us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, mro:InternationalExplorationAndProduction


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value1819201922212425383444495054621028975
Percentage of DepreciationDepletionAndAmortization3.43.83.83.43.73.33.94.06.36.17.27.88.29.210.615.915.013.5

us-gaap:OperatingSegments, mro:NorthAmericaExplorationAndProduction


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value506472495530569617586589561514562571556528513531495472
Percentage of DepreciationDepletionAndAmortization95.195.295.095.795.395.895.194.792.792.891.791.290.889.588.082.883.684.9

Increase Decrease In Inventories

us-gaap:IncreaseDecreaseInInventories

us-gaap:IncreaseDecreaseInInventories


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.02.0-1.00.0-1.06.01.0-1.01.0-4.0-10.0-6.08.09.0-6.0-9.0-5.010.06.0-51.0-23.0-7.0-6.0-9.0-43.022-21.0-26.017418.0-8.01.01528-12.025-7.014-1.0320-366.0136-6.0-194.0235
Percentage of IncreaseDecreaseInInventories0.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value6556224183459.0701700737797515855352496408309115517741088147012291645868152812051070769973103410801818259228858611278849
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax52.252.850.945.31.868.556.859.057.742.962.023.937.526.620.246.359.737.041.740.442.022.337.228.425.720.324.127.128.447.012.34.529.144.05.1

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1697-338.0-317.0-750.0-46.0-20.016516117439025496356-28.0-599.0-139.0-4957.0-1371.0-192.0-170.0-407.0-793.0-749.0-386.0-276.09264315401149375569426383322450393417549405996996706696709457
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.38.2-41.1-41.7-153.1-4.5-1.613.211.714.528.316.56.623.2-2.1-52.7-13.1-462.4517.4-15.6-13.1-55.8-53.8-56.6-25.2-18.037.114.518.432.612.314.510.99.37.610.810.410.314.410.725.84.71.123.624.42.7

us-gaap:NetIncomeLoss us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-259.0-165.0-334.0-190.0-379.0-25.0-201.0-58.0-150.0-19.0148-63.0-169.099
Percentage of NetIncomeLoss-1618.8-170.198.859.950.554.31005.0-35.2-93.2-10.937.9-24.8-176.027.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-20.7-14.0-40.6-25.0-77.3-2.4-16.3-4.6-10.9-1.610.7-4.1-11.76.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:CorporateNonSegment0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetIncomeLoss us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, mro:InternationalExplorationAndProduction


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value6850298.0-6.0-1.03343966183116142132
Percentage of NetIncomeLoss425.051.5-8.6-2.50.82.2-165.026.159.635.121.345.7147.937.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.44.23.51.1-1.2-0.12.73.47.05.16.07.59.88.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments mro:InternationalExplorationAndProduction104.6111.155.820.5-21.4-1.950.855.853.044.244.460.762.832.0

us-gaap:OperatingSegments, mro:NorthAmericaExplorationAndProduction


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value207212-33.0-135.0-365.0-20.0148180215132159201123125
Percentage of NetIncomeLoss1293.8218.69.842.648.743.5-740.0109.1133.575.940.879.1128.135.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax16.518.0-4.0-17.7-74.5-2.012.014.415.611.011.513.18.58.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments mro:NorthAmericaExplorationAndProduction17.418.7-4.3-18.7-79.0-2.112.715.417.912.413.314.910.111.1

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

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Net
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value-6.07.01.0-2.0702.04.0-13.0-5.0
Percentage of NetIncomeLoss1.9-0.9-2.210.042.41.22.3-5.1-5.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.81.40.1-0.25.60.10.3-0.8-0.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.0

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedOtherComprehensiveIncome


Net
Period End2021-06-302021-03-312020-06-302020-03-31
Value-31.01.07.01.0
Percentage of NetIncomeLoss-193.81.0-0.9-2.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-2.50.11.40.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.0

us-gaap:NetIncomeLoss us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

mro:ConsolidatedEquityMethodInvestments


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value85722412-13.0-26.04745
Percentage of NetIncomeLoss531.274.2-7.1-3.81.756.5-235.027.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.86.12.91.6-2.7-2.53.83.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax mro:ConsolidatedEquityMethodInvestments0.00.00.00.00.00.00.00.0

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312011-12-312011-09-30
Value1697-317.0-750.0-46.016516117439025496356-28.0549405
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.38.2-41.7-153.1-4.513.211.714.528.316.56.623.2-2.114.410.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Share Based Compensation

us-gaap:ShareBasedCompensation

us-gaap:ShareBasedCompensation


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value116.014151315151318149.0161414121212141111131310.0
Percentage of ShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-256.0-207.0-243.0-145.0-304.0-611.0-894.0-795.0-565.0-564.0-549.0258-247.0-1771.0-1442.02.0-1544.0-1252.01048-1110.0-1112.0-1262.0-1037.0-1408.0-2030.0-1195.0-806.0-5056.0-738.0-1040.0-833.0-365.0-1114.0-1132.0-10.0
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-20.4-17.6-29.6-19.1-62.0-59.7-72.5-63.7-40.9-47.0-39.817.5-18.7-115.7-94.10.1-52.0-42.629.7-36.5-28.4-32.4-25.3-33.2-48.8-31.6-20.0-132.7-19.4-26.9-4.0-0.6-37.7-39.0-0.1

Payments To Acquire Property Plant And Equipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value274209253144326620616672647615684769638662669530492283262230299454528628868145215211409117910519481142130113751431132811641017858735640106220598435121348
Percentage of PaymentsToAcquirePropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-554.0-32.0-552.03970.0-131.0-113.0-72.0-278.0-72.0-404.0-377.0-29.0-49.0-1043.0-864.0-46.0-50.0-37.0-44.0-43.01198-1068.0-139.01807-138.0-173.0-77.0-533.0-810.0-208.0-411.0-130.0-413.02151175367-157.0-113.0-403.0-1781.02.0-212.0-176.0-798.0-172.0
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-44.2-2.7-67.252.20.0-12.8-9.2-5.8-20.1-6.0-29.3-24.5-2.0-3.2-78.1-76.1-4.3-4.714.0-3.6-3.3164.1-72.4-10.5118.0-9.0-6.9-2.6-18.1-23.0-6.8-10.5-3.3-10.15.128.29.7-3.9-3.0-10.6-46.10.0-0.3-6.0-27.5-1.0

Payments Of Dividends

us-gaap:PaymentsOfDividends

us-gaap:PaymentsOfDividends


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value3223240.00.0404040414141434342424343424342433433142143142142141127133132135121120120120119121105106178178178176178172
Percentage of PaymentsOfDividends100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Payments For Repurchase Of Common Stock

us-gaap:PaymentsForRepurchaseOfCommonStock

us-gaap:PaymentsForRepurchaseOfCommonStock


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-31
Value0.09.00.00.00.0926630236303643382.09.01.00.03.07.0-5.01.04.00.00.00.00.00.00.00.04495510.05000.00.00.00.0
Percentage of PaymentsForRepurchaseOfCommonStock0.0100.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.0100.0100.00.0100.00.00.00.00.0

Debt Instrument Interest Rate Stated Percentage

us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument

us-gaap:DebtInstrumentInterestRateStatedPercentage

mro:SeniorUnsecuredNoteDue2022


Debt
Period End2020-10-312019-09-30
Value2.80.028
Percentage of DebtInstrumentInterestRateStatedPercentage100.0100.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations mro:SeniorUnsecuredNoteDue20220.00.0

mro:SeniorUnsecuredNotes3850Due2025


Debt
Period End2021-06-30
Value3.85
Percentage of DebtInstrumentInterestRateStatedPercentage0.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations mro:SeniorUnsecuredNotes3850Due20250.0

us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument, us-gaap:LongtermDebtType

mro:Bonds200Due2037, us-gaap:Bonds


Debt
Period End2020-12-31
Value2.0
Percentage of DebtInstrumentInterestRateStatedPercentage0.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations mro:Bonds200Due2037 us-gaap:Bonds0.0

mro:Bonds210Due2037, us-gaap:Bonds


Debt
Period End2020-12-31
Value2.1
Percentage of DebtInstrumentInterestRateStatedPercentage0.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations mro:Bonds210Due2037 us-gaap:Bonds0.0

mro:Bonds2125Due2037, us-gaap:Bonds


Debt
Period End2020-12-31
Value2.125
Percentage of DebtInstrumentInterestRateStatedPercentage0.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations mro:Bonds2125Due2037 us-gaap:Bonds0.0

mro:Bonds220Due2037, us-gaap:Bonds


Debt
Period End2020-12-31
Value2.2
Percentage of DebtInstrumentInterestRateStatedPercentage0.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations mro:Bonds220Due2037 us-gaap:Bonds0.0

mro:Bonds2375Due2037, us-gaap:Bonds


Debt
Period End2020-12-31
Value2.375
Percentage of DebtInstrumentInterestRateStatedPercentage0.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations mro:Bonds2375Due2037 us-gaap:Bonds0.0

mro:SeniorUnsecuredNotes2800Due2022, us-gaap:UnsecuredDebt


Debt
Period End2020-12-31
Value2.8
Percentage of DebtInstrumentInterestRateStatedPercentage0.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations mro:SeniorUnsecuredNotes2800Due2022 us-gaap:UnsecuredDebt0.0

mro:SeniorUnsecuredNotes3850Due2025, us-gaap:UnsecuredDebt


Debt
Period End2020-12-31
Value3.85
Percentage of DebtInstrumentInterestRateStatedPercentage0.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations mro:SeniorUnsecuredNotes3850Due2025 us-gaap:UnsecuredDebt0.0

mro:SeniorUnsecuredNotes4400Due2027, us-gaap:UnsecuredDebt


Debt
Period End2020-12-31
Value4.4
Percentage of DebtInstrumentInterestRateStatedPercentage0.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations mro:SeniorUnsecuredNotes4400Due2027 us-gaap:UnsecuredDebt0.0

mro:SeniorUnsecuredNotes5200Due2045, us-gaap:UnsecuredDebt


Debt
Period End2020-12-31
Value5.2
Percentage of DebtInstrumentInterestRateStatedPercentage0.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations mro:SeniorUnsecuredNotes5200Due2045 us-gaap:UnsecuredDebt0.0

mro:SeniorUnsecuredNotes6600Due2037, us-gaap:UnsecuredDebt


Debt
Period End2020-12-31
Value6.6
Percentage of DebtInstrumentInterestRateStatedPercentage0.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations mro:SeniorUnsecuredNotes6600Due2037 us-gaap:UnsecuredDebt0.0

mro:SeniorUnsecuredNotes6800Due2032, us-gaap:UnsecuredDebt


Debt
Period End2020-12-31
Value6.8
Percentage of DebtInstrumentInterestRateStatedPercentage0.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations mro:SeniorUnsecuredNotes6800Due2032 us-gaap:UnsecuredDebt0.0

mro:SeniorUnsecuredNotes8125Due2023, us-gaap:UnsecuredDebt


Debt
Period End2020-12-31
Value8.125
Percentage of DebtInstrumentInterestRateStatedPercentage0.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations mro:SeniorUnsecuredNotes8125Due2023 us-gaap:UnsecuredDebt0.0

mro:SeniorUnsecuredNotes8500Due2023, us-gaap:UnsecuredDebt


Debt
Period End2020-12-31
Value8.5
Percentage of DebtInstrumentInterestRateStatedPercentage0.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations mro:SeniorUnsecuredNotes8500Due2023 us-gaap:UnsecuredDebt0.0

mro:SeniorUnsecuredNotes9375Due2022, us-gaap:UnsecuredDebt


Debt
Period End2020-12-31
Value9.375
Percentage of DebtInstrumentInterestRateStatedPercentage0.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations mro:SeniorUnsecuredNotes9375Due2022 us-gaap:UnsecuredDebt0.0

Effective Income Tax Rate Continuing Operations

us-gaap:EffectiveIncomeTaxRateContinuingOperations

us-gaap:EffectiveIncomeTaxRateContinuingOperations


Effective
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value38.09.00-2.00.020.060.050.060.17-5.44-0.080.290.310.320.460.310.372.131.1-0.34-0.280.4-0.530.1-0.160.34-0.030-0.20.520-0.04-0.010.730.020.010.020.69-0.030.040.170.43-0.0500.020.53
Percentage of EffectiveIncomeTaxRateContinuingOperations100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0

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

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-31
Value21.7221.5321.021.1321.2921.3323.5523.4223.6523.624.3925.8925.4124.3925.5225.5725.3726.9727.7127.8327.4227.2729.9729.9929.9729.6529.6829.6729.6827.6127.2726.9926.8526.6526.1925.4725.3325.2724.4124.4724.4334.1235.01
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice us-gaap:AwardType

us-gaap:EmployeeStockOption


Share
Period End2020-12-312019-12-31
Value21.023.55
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice100.0100.0

Deferred Tax Liabilities

us-gaap:DeferredTaxLiabilities

us-gaap:DeferredTaxLiabilities


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value1631860.0344210212191935159315304612-7418.0-7915.0
Percentage of DeferredTaxLiabilities100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Assets Net

us-gaap:DeferredTaxAssetsNet

us-gaap:DeferredTaxAssetsNet


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value174917151275107216382262193532863013283635253417
Percentage of DeferredTaxAssetsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Unrecognized Tax Benefits

us-gaap:UnrecognizedTaxBenefits

us-gaap:UnrecognizedTaxBenefits


Unrecognized
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value8.01326312666658014698177166154157141139133103686967753940
Percentage of UnrecognizedTaxBenefits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Assets Valuation Allowance

us-gaap:DeferredTaxAssetsValuationAllowance

us-gaap:DeferredTaxAssetsValuationAllowance


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value9486997499264301
Percentage of DeferredTaxAssetsValuationAllowance100.0100.0100.0100.0100.0

mro:AssetRetirementObligationIncreaseDecreaseNoncashExcludingDispositions

mro:AssetRetirementObligationIncreaseDecreaseNoncashExcludingDispositions


Asset
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value326.01.02.0-8.040116.023-195.013
Percentage of AssetRetirementObligationIncreaseDecreaseNoncashExcludingDispositions100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mro:FairValueOfEquityMethodInvestmentsImpairedDuringThePeriod us-gaap:ImpairedLongLivedAssetsHeldAndUsedByType

mro:FairValueOfEquityMethodInvestmentsImpairedDuringThePeriod

us-gaap:EquityMethodInvestments


Fair
Period End2020-09-30
Value23
Percentage of FairValueOfEquityMethodInvestmentsImpairedDuringThePeriod100.0

mro:GoodwillAndLongLivedAssetImpairments

mro:GoodwillAndLongLivedAssetImpairments


Goodwill
Period End2021-06-302021-03-312020-06-302020-03-31
Value461.00.097
Percentage of GoodwillAndLongLivedAssetImpairments100.0100.00.0100.0

mro:InvestmentsRepaymentsOfLoansAndReturnOfCapital

mro:InvestmentsRepaymentsOfLoansAndReturnOfCapital


Investments
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-03-31
Value0.00.00.07.0132.037129.016239.0150.037128.010.0231416302110.015197.0201616111815216.015185.08.0286714
Percentage of InvestmentsRepaymentsOfLoansAndReturnOfCapital0.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mro:LessorOperatingLeaseAnnualPaymentstobeReceived

mro:LessorOperatingLeaseAnnualPaymentstobeReceived


Lessor
Period End2021-03-312020-12-31
Value6000000.00
Percentage of LessorOperatingLeaseAnnualPaymentstobeReceived100.00.0

mro:MakeWholeProvisionPremiumAndWriteOffOfDiscountAndIssuanceCosts us-gaap:DebtInstrument

mro:MakeWholeProvisionPremiumAndWriteOffOfDiscountAndIssuanceCosts

mro:SeniorUnsecuredNoteDue2022


Make
Period End2021-03-30
Value19
Percentage of MakeWholeProvisionPremiumAndWriteOffOfDiscountAndIssuanceCosts100.0

mro:NetInterestAndOther

mro:NetInterestAndOther


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value-59.0-13.0-61.0-62.0-69.0-64.0-67.0-64.0-64.0-49.0-58.0-58.0-65.0-45.0-71.0-35.0-86.0-78.0-77.0-87.0-86.0-85.0-87.0-75.0-58.0-47.0-58.0-55.0-76.0-52.0-65.0-66.0-71.0-72.0-59.0-53.0-57.0-50.0
Percentage of NetInterestAndOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mro:NetInterestAndOther us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value-59.0-13.0-61.0-62.0-69.0-64.0-67.0-64.0-64.0-49.0-58.0-58.0-65.0-45.0-71.0-35.0
Percentage of NetInterestAndOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mro:NetInterestAndOther us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges


Net
Period End2021-06-302021-03-312018-12-312018-09-302017-12-312017-09-30
Value-30.0-2.00.00.00.046
Percentage of NetInterestAndOther50.815.4-0.0-0.0-0.0-131.4

mro:NetSettlementOfDerivativeInstruments

mro:NetSettlementOfDerivativeInstruments


Net
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value845135783111145.022-26.0-89.0-107.0-59.0-43.085
Percentage of NetSettlementOfDerivativeInstruments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mro:NetSettlementOfDerivativeInstruments us-gaap:DerivativeInstrumentRisk

us-gaap:CommodityContract


Net
Period End2021-03-312020-03-31
Value11-13.0
Percentage of NetSettlementOfDerivativeInstruments0.0-41.9

mro:ProceedsFromSaleOfAssetsNetOfCashTransferredToBuyer

mro:ProceedsFromSaleOfAssetsNetOfCashTransferredToBuyer


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value123.09.00.06.03.08.0
Percentage of ProceedsFromSaleOfAssetsNetOfCashTransferredToBuyer100.0100.0100.00.0100.0100.0100.0

mro:ShareBasedCompensationArrangementPerformanceSharesVestingPercentageBankingFeatureLockThresholdPercentage us-gaap:Vesting

mro:ShareBasedCompensationArrangementPerformanceSharesVestingPercentageBankingFeatureLockThresholdPercentage

us-gaap:ShareBasedCompensationAwardTrancheOne


Share
Period End2021-06-302021-03-31
Value050.0
Percentage of ShareBasedCompensationArrangementPerformanceSharesVestingPercentageBankingFeatureLockThresholdPercentage0.0100.0

us-gaap:ShareBasedCompensationAwardTrancheTwo


Share
Period End2021-06-302021-03-31
Value0100.0
Percentage of ShareBasedCompensationArrangementPerformanceSharesVestingPercentageBankingFeatureLockThresholdPercentage0.0200.0

mro:StockRepurchasedForTaxObligationsAssociatedWithRestrictedStockAwardsValue

mro:StockRepurchasedForTaxObligationsAssociatedWithRestrictedStockAwardsValue


Stock
Period End2021-06-302021-03-31
Value09000000.0
Percentage of StockRepurchasedForTaxObligationsAssociatedWithRestrictedStockAwardsValue0.0100.0

us-gaap:AllowanceForDoubtfulAccountsReceivableRecoveries

us-gaap:AllowanceForDoubtfulAccountsReceivableRecoveries


Allowance
Period End2020-12-312020-03-31
Value2000000.010000000.0
Percentage of AllowanceForDoubtfulAccountsReceivableRecoveries100.0100.0

us-gaap:AllowanceForDoubtfulAccountsReceivableWriteOffs

us-gaap:AllowanceForDoubtfulAccountsReceivableWriteOffs


Allowance
Period End2020-12-312020-03-31
Value1.013
Percentage of AllowanceForDoubtfulAccountsReceivableWriteOffs100.0100.0

us-gaap:AssetImpairmentCharges

us-gaap:AssetImpairmentCharges


Asset
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-30
Value461.01.00.0970.018
Percentage of AssetImpairmentCharges100.0100.0100.00.0100.00.0100.0

us-gaap:AssetImpairmentCharges us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Asset
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-30
Value461.01.00.0970.018
Percentage of AssetImpairmentCharges100.0100.0100.00.0100.00.0100.0

us-gaap:AssetRetirementObligationAccretionExpense

us-gaap:AssetRetirementObligationAccretionExpense


Asset
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value3.03.03.03.03.03.02.03.01313171718182025
Percentage of AssetRetirementObligationAccretionExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssetRetirementObligationLiabilitiesIncurred

us-gaap:AssetRetirementObligationLiabilitiesIncurred


Asset
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value2.04.03.01.01.01.09.07.06.012112.04.04.06.010.0
Percentage of AssetRetirementObligationLiabilitiesIncurred100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssetRetirementObligationLiabilitiesSettled

us-gaap:AssetRetirementObligationLiabilitiesSettled


Asset
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312013-03-312012-03-31
Value1.01.01.08.01.02.04.09772010912916.08.010.013887.0
Percentage of AssetRetirementObligationLiabilitiesSettled100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssetRetirementObligationRevisionOfEstimate

us-gaap:AssetRetirementObligationRevisionOfEstimate


Asset
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value302.02.00.01.0-9.0314.00.011-74.0-121.0-9.00.0-114.096
Percentage of AssetRetirementObligationRevisionOfEstimate100.0100.0100.00.0100.0100.0100.0100.00.0100.0100.0100.0100.00.0100.0100.0

us-gaap:AssetRetirementObligationRevisionOfEstimate us-gaap:StatementGeographical

mro:GulfOfMexico


Asset
Period End2021-06-30
Value29
Percentage of AssetRetirementObligationRevisionOfEstimate96.7

us-gaap:CapitalExpendituresIncurredButNotYetPaid

us-gaap:CapitalExpendituresIncurredButNotYetPaid


Capital
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value16691433-190.0238-14.02.05025012238303279-31.024107760.00.00.00.01419937589847-49.0-105.0
Percentage of CapitalExpendituresIncurredButNotYetPaid100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CommonStockDividendsPerShareCashPaid

us-gaap:CommonStockDividendsPerShareCashPaid


Common
Period End2020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.0300.050.050.050.050.050.050.050.050.050.050.050.050.050.050.050.050.050.050.210.210.210.210.210.190.190.190.190.170.170.170.170.170.170.150.150.250.250.250.250.250.24
Percentage of CommonStockDividendsPerShareCashPaid100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value0.0-1.00.0-1.00.00.0-1.00.00.00.00.0-1.00.00.00.00.00.00.00.0
Percentage of DefinedBenefitPlanAmortizationOfGainsLosses0.0100.00.0100.00.00.0100.00.00.00.00.0100.00.00.00.00.00.00.00.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-30
Value-1.0-2.0-2.0-2.0-3.0-2.0-2.0-2.0-3.0-3.0-3.0-3.0-2.0-2.0-4.0
Percentage of DefinedBenefitPlanAmortizationOfGainsLosses0.0200.00.0200.00.0200.00.00.00.0300.00.00.00.00.00.0

us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value-4.0-4.0-4.0-5.0-4.0-5.0-5.0-4.0-4.0-2.0-2.0-2.0-2.0-2.0-2.0-1.0-2.00.0-1.0
Percentage of DefinedBenefitPlanAmortizationOfPriorServiceCostCredit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-30
Value-1.0-2.0-1.0-2.0-2.0-1.0-2.0-2.0-2.0-3.0-2.0-3.0-2.0-2.0-2.0
Percentage of DefinedBenefitPlanAmortizationOfPriorServiceCostCredit25.050.025.040.050.020.050.050.0100.0150.0100.0150.0200.0100.0200.0

us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-30
Value2.02.02.02.03.03.08.08.09.08.09.010.010.01212
Percentage of DefinedBenefitPlanExpectedReturnOnPlanAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanInterestCost us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanInterestCost

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-06-302020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value1.01.00.01.00.01.01.01.01.02.02.02.02.02.0
Percentage of DefinedBenefitPlanInterestCost100.0100.00.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value2.02.02.02.03.03.07.07.07.06.07.07.0
Percentage of DefinedBenefitPlanInterestCost200.00.0200.00.0300.0300.0700.0700.0350.0300.0350.0350.0

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value-3.0-3.0-3.0-18.0-3.0-4.0-3.0-3.0-3.00.00.01.01.01.00.01.01.02.03.0
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.00.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-30
Value9.04.014168.06.06.03.0135.07.010.05.01619
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost-300.0-133.3-466.7-88.9-266.7-200.0-200.0-100.00.0500.0700.00.0500.01600.0633.3

us-gaap:DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments us-gaap:ConsolidationItems, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments

us-gaap:CorporateNonSegment, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312020-09-302020-06-30
Value0.00.017
Percentage of DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments0.00.0100.0

us-gaap:DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments us-gaap:RetirementPlanType

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-09-302020-06-302019-06-30
Value0.0140.0
Percentage of DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments0.082.40.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-09-302020-06-302019-06-30
Value0.03.00.0
Percentage of DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments0.017.60.0

us-gaap:DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1

us-gaap:DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-1.03.0-2.0-6.07.00.0-6.02.02.05.0-3.0-8.00.0-3.0-3.0-5.0-1.0-10.0
Percentage of DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1 us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value-1.03.0-2.0-6.07.00.0-6.02.01.03.0-5.0-11.0-2.0-5.0-7.0-5.0
Percentage of DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1100.0100.0100.0100.0100.00.0100.0100.050.060.0166.7137.50.0166.7233.3100.0

us-gaap:DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1 us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, mro:AccumulatedDefinedBenefitPlanAdjustmentNetGainLossDueToCurtailmentAttributableToParent


Defined
Period End2020-12-312020-09-302020-06-302019-06-30
Value0.00.0170.0
Percentage of DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1-0.0-0.0242.90.0

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, mro:AccumulatedDefinedBenefitPlanAdjustmentNetGainLossDueToSettlementAttributableToParent


Defined
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value-5.0-5.0-9.0-14.0-2.0-10.00.0-2.00.0-5.0-10.0-2.0-4.0-7.0-8.0
Percentage of DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1500.0250.0150.0-200.00.0166.70.0-100.00.0166.7125.00.0133.3233.3160.0

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Defined
Period End2020-09-302019-12-312019-09-30
Value-6.0-4.03.0
Percentage of DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1100.066.7150.0

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceCostCredit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value5.06.06.05.07.06.07.06.06.06.031-4.05.04.029-5.0
Percentage of DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1-500.0200.0-300.0-83.3100.00.0-116.7300.0300.0120.0-1033.350.00.0-133.3-966.7100.0

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLoss


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value-1.0-3.0-3.0-2.0-3.0-3.0-1.0-3.0-2.0-2.0-2.0-3.0-4.0-3.0-2.0-3.0
Percentage of DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1100.0-100.0150.033.3-42.90.016.7-150.0-100.0-40.066.737.50.0100.066.760.0

us-gaap:DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1 us-gaap:RetirementPlanType

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value-5.0-9.0-14.0-2.00.0-2.00.0-10.0-2.0-4.0-8.0
Percentage of DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1500.0150.0-200.00.00.0-100.00.0125.00.0133.3160.0

us-gaap:DefinedBenefitPlanServiceCost us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanServiceCost

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value4.04.04.05.05.05.05.04.04.05.04.05.0
Percentage of DefinedBenefitPlanServiceCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeGainLossOnDerivativeNet us-gaap:DerivativeInstrumentRisk

us-gaap:DerivativeGainLossOnDerivativeNet

us-gaap:CommodityContract


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value-91.0-71.05135263111145.0
Percentage of DerivativeGainLossOnDerivativeNet100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeGainOnDerivative us-gaap:ConsolidationItems, us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship

us-gaap:DerivativeGainOnDerivative

us-gaap:CorporateNonSegment, mro:InterestRateContractMaturingJune12025, us-gaap:Nondesignated


Derivative
Period End2021-06-30
Value31
Percentage of DerivativeGainOnDerivative100.0

us-gaap:DerivativeGainOnDerivative us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship

us-gaap:InterestRateContract, us-gaap:Nondesignated


Derivative
Period End2021-03-31
Value41
Percentage of DerivativeGainOnDerivative0.0

us-gaap:DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet

us-gaap:DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-166.0-153.0-15.0-1.0-70.0202-44.04716-91.0310-70.0-152.0-102.0-151.0-22.05681
Percentage of DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value-75.0-82.0-66.0-36.0-96.0171-55.03311-113.033619-45.0-43.0-145.0-56.0
Percentage of DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet45.253.6440.03600.0137.184.7125.070.268.8124.2108.4-27.129.642.296.0254.5

us-gaap:DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, mro:NorthAmericaExplorationAndProduction


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-91.0-71.05135263111145.022-26.0-89.0-107.0-59.0-6.034134.0
Percentage of DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet54.846.4-340.0-3500.0-37.115.3-25.029.831.2-24.2-8.4127.170.457.84.0-154.523.24.9

us-gaap:DerivativeLossOnDerivative us-gaap:ConsolidationItems, us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship

us-gaap:DerivativeLossOnDerivative

us-gaap:CorporateNonSegment, mro:InterestRateContractMaturingNovember12022, us-gaap:Nondesignated


Derivative
Period End2021-06-30
Value22
Percentage of DerivativeLossOnDerivative100.0

us-gaap:DerivativeLossOnDerivative us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

mro:InterestRateContractMaturingNovember12022, us-gaap:Nondesignated


Derivative
Period End2021-06-30
Value22
Percentage of DerivativeLossOnDerivative100.0

us-gaap:DividendsCommonStockCash

us-gaap:DividendsCommonStockCash


Dividends
Period End2021-06-302021-03-312020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312011-12-31
Value3223404041414143434242105
Percentage of DividendsCommonStockCash100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DividendsCommonStockCash us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Dividends
Period End2021-06-302021-03-312020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312011-12-31
Value3223404041414143434242105
Percentage of DividendsCommonStockCash100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EquityMethodInvestmentOtherThanTemporaryImpairment

us-gaap:EquityMethodInvestmentOtherThanTemporaryImpairment


Equity
Period End2020-09-302020-06-302010-12-312010-09-30
Value181520.025
Percentage of EquityMethodInvestmentOtherThanTemporaryImpairment100.0100.00.0100.0

us-gaap:EquityMethodInvestmentOtherThanTemporaryImpairment us-gaap:ImpairedLongLivedAssetsHeldAndUsedByType

us-gaap:EquityMethodInvestments


Equity
Period End2020-09-302020-06-302019-06-30
Value181520.0
Percentage of EquityMethodInvestmentOtherThanTemporaryImpairment100.0100.00.0

us-gaap:ExplorationAbandonmentAndImpairmentExpense

us-gaap:ExplorationAbandonmentAndImpairmentExpense


Exploration
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value22179623182229162049111515142292492520243715511506560816740364113431791259040417011311658464791173103115952
Percentage of ExplorationAbandonmentAndImpairmentExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ExplorationExpense

us-gaap:ExplorationExpense


Exploration
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value2521100272628422226591165665525729430283483189245325851119047996145762371531334652381761731421401291452302165912598
Percentage of ExplorationExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ExplorationExpense us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Exploration
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value7.0786.00.00.00.00.00.00.0400.00.00.00.0250
Percentage of ExplorationExpense28.078.022.20.00.00.00.00.00.034.50.00.00.00.085.0

us-gaap:ExplorationExpense us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, mro:NorthAmericaExplorationAndProduction


Exploration
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value182122212628422226597655645157413026
Percentage of ExplorationExpense72.0100.022.077.8100.0100.0100.0100.0100.0100.065.598.298.598.1100.013.9100.092.9

us-gaap:GainLossOnDispositionOfAssets1

us-gaap:GainLossOnDispositionOfAssets1


Gain
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value1.01.01.0-2.09.0-6.022-8.042-4.0165025732196.01.010847294-60.0228-109.00.01.0-2.0-3.0-87.02.0
Percentage of GainLossOnDispositionOfAssets1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0

us-gaap:GainLossOnDispositionOfAssets1 us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Gain
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value1.01.01.0-2.09.0-6.022-8.042-4.016502573318
Percentage of GainLossOnDispositionOfAssets1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0103.194.7

us-gaap:GainLossOnSaleOfDerivatives

us-gaap:GainLossOnSaleOfDerivatives


Gain
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value-15.0-1.0-70.0202-55.04716-91.0310-70.0-152.0-102.0-151.0226377-15.040-86.0-2.038105
Percentage of GainLossOnSaleOfDerivatives100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:GainLossOnTerminationOfLease

us-gaap:GainLossOnTerminationOfLease


Gain
Period End2021-03-31
Value-13000000.0
Percentage of GainLossOnTerminationOfLease100.0

us-gaap:GoodwillImpairmentLoss

us-gaap:GoodwillImpairmentLoss


Goodwill
Period End2020-12-312020-09-302020-06-302020-03-312019-06-302019-03-31
Value0.00.00.0950.00.0
Percentage of GoodwillImpairmentLoss0.00.00.0100.00.00.0

us-gaap:GoodwillImpairmentLoss us-gaap:ImpairedLongLivedAssetsHeldAndUsedByType

us-gaap:Goodwill


Goodwill
Period End2020-09-30
Value0.0
Percentage of GoodwillImpairmentLoss0.0

us-gaap:ImpairmentOfLongLivedAssetsHeldForUse

us-gaap:ImpairmentOfLongLivedAssetsHeldForUse


Impairment
Period End2021-06-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value240.0381008.01.02620.00.02820.0400.033434
Percentage of ImpairmentOfLongLivedAssetsHeldForUse100.00.0100.0100.0100.0100.0100.00.00.0100.00.0100.00.0100.0100.0

us-gaap:ImpairmentOfLongLivedAssetsHeldForUse us-gaap:ConsolidationItems, us-gaap:StatementGeographical

us-gaap:CorporateNonSegment, mro:EagleFord


Impairment
Period End2021-06-30
Value24
Percentage of ImpairmentOfLongLivedAssetsHeldForUse100.0

us-gaap:ImpairmentOfOilAndGasProperties

us-gaap:ImpairmentOfOilAndGasProperties


Impairment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value221.0461.00.0970.00.0186.0258.0348.0242010.04.019470.01.0371337440.02.01094.017
Percentage of ImpairmentOfOilAndGasProperties100.0100.0100.0100.00.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.0100.00.0100.0100.0100.0100.0

us-gaap:ImpairmentOfOilAndGasProperties us-gaap:ConsolidationItems, us-gaap:StatementGeographical

us-gaap:CorporateNonSegment, mro:GulfOfMexico


Impairment
Period End2021-06-30
Value22
Percentage of ImpairmentOfOilAndGasProperties100.0

us-gaap:ImpairmentOfOilAndGasProperties us-gaap:ImpairedLongLivedAssetsHeldAndUsedByType

mro:ProvedProperty


Impairment
Period End2020-12-31
Value46
Percentage of ImpairmentOfOilAndGasProperties100.0

mro:UnprovedProperty


Impairment
Period End2020-12-31
Value78
Percentage of ImpairmentOfOilAndGasProperties169.6

us-gaap:OilAndGasProperties


Impairment
Period End2020-09-302020-06-302019-09-302019-06-30
Value1.00.00.018
Percentage of ImpairmentOfOilAndGasProperties100.00.00.0100.0

us-gaap:ImpairmentOfOilAndGasProperties us-gaap:StatementGeographical

mro:GulfOfMexico


Impairment
Period End2021-06-30
Value22
Percentage of ImpairmentOfOilAndGasProperties100.0

us-gaap:IncomeLossFromEquityMethodInvestments

us-gaap:IncomeLossFromEquityMethodInvestments


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value494413-10.0-152.0-12.0242131116464603773635169655937144736263678891201371141147711811012260781021231201261697783105
Percentage of IncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncomeLossFromEquityMethodInvestments us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Income
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value-1.0-18.0-152.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of IncomeLossFromEquityMethodInvestments-7.7180.0100.0-0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:IncomeLossFromEquityMethodInvestments us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, mro:InternationalExplorationAndProduction


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value4944148.00.0-12.0242131116464603773635169
Percentage of IncomeLossFromEquityMethodInvestments100.0100.0107.7-80.0-0.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions

us-gaap:IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value3.014-21.0-9.0-152.0-28.08.0-14.02.0-14.0-3.0-15.05.0-32.02615-48.0-13.09.0-4.08.0-30.08.0-4.0-34.0-3.024-61.0-33.0430.0-12.0-48.048-25.021-28.021-31.0-37.0-28.04912-34.0-42.042
Percentage of IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities

us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value2010197-22.0-222.0-234.0-23.0-6.0-56.0-102.0-155.02015281108230-40.0-1.0103-25.0-90.0-121.0-11.0-184.0-301.0-469.082-84.0-160.0129-330.0365-597.0-54.0-60.0606-663.0213124-387.048700114639383448
Percentage of IncreaseDecreaseInAccountsPayableAndAccruedLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInOtherCurrentAssetsAndLiabilitiesNet

us-gaap:IncreaseDecreaseInOtherCurrentAssetsAndLiabilitiesNet


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-12.0-61.08.0-37.0-62.01611211-105.0-14.022-8.0-17.025
Percentage of IncreaseDecreaseInOtherCurrentAssetsAndLiabilitiesNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInPensionAndPostretirementObligations

us-gaap:IncreaseDecreaseInPensionAndPostretirementObligations


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value-7.0-7.0-8.0-4.0-20.0-11.0-1.0-10.0-16.0-25.0-5.0-9.0-17.0-34.0-8.0-13.0-16.0-9.0-5.0-12.00.014-8.0-5.021-7.0-7.0-53.05.0214.07.0277.025-34.07.0-29.0
Percentage of IncreaseDecreaseInPensionAndPostretirementObligations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInReceivables

us-gaap:IncreaseDecreaseInReceivables


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value7817510022-82.0-407.0-151.04.02273-256.0133126130142177141.090-52.045-133.0-79.0-204.0-146.0-388.0-389.04.022046-428.0168-21.04.0-147.0539-189.0296194-124.0-708.06301052111-180.0193
Percentage of IncreaseDecreaseInReceivables100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-312019-09-30
Value-16.03.0-3.0-9.0429.0-38.0
Percentage of OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value-21.0441311-4.0-22.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax

us-gaap:InterestRateContract, us-gaap:Nondesignated


Other
Period End2021-03-312020-09-30
Value2000000.05000000.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax100.0100.0

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax


Other
Period End2021-06-302021-03-31
Value302.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax100.0100.0

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax us-gaap:DerivativeInstrumentRisk

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax

mro:InterestRateContractMaturingJune12025


Other
Period End2021-06-30
Value31
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax100.0

mro:InterestRateContractMaturingSeptember92026


Other
Period End2021-06-30
Value-1.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax-3.2

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value-35.03920-46.0-22.062-9.0-4.0
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value-35.03920-46.0-22.062-9.0-4.0
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherOperatingActivitiesCashFlowStatement

us-gaap:OtherOperatingActivitiesCashFlowStatement


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value-6000000.0-37000000.024000000.0-9000000.0-18000000.0-10000000.0-7000000.0
Percentage of OtherOperatingActivitiesCashFlowStatement100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherOperatingIncome

us-gaap:OtherOperatingIncome


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value5.03.09.03.06.07.08.06.0133515119124.0478.09.0141623124.03612151123152020261910.09.0-7.017215.018146.03557243.033
Percentage of OtherOperatingIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherOperatingIncome us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value0.01.00.01.01.01.01.01.07.0311.01138.00.0525.0
Percentage of OtherOperatingIncome0.033.30.033.316.714.312.516.753.888.66.795.066.70.0110.662.5

us-gaap:OtherOperatingIncome us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, mro:InternationalExplorationAndProduction


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value2.01.02.01.02.02.02.02.02.03.05.04.02.01.0-8.00.04.010.0
Percentage of OtherOperatingIncome40.033.322.233.333.328.625.033.315.48.633.33.416.725.0-17.00.044.471.4

us-gaap:OperatingSegments, mro:NorthAmericaExplorationAndProduction


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value3.01.07.01.03.04.05.03.04.01.09.02.02.03.03.03.02.04.0
Percentage of OtherOperatingIncome60.033.377.833.350.057.162.550.030.82.960.01.716.775.06.437.522.228.6

us-gaap:OtherPostretirementBenefitsPayments us-gaap:RetirementPlanType

us-gaap:OtherPostretirementBenefitsPayments

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Other
Period End2021-06-302021-03-312018-06-302018-03-31
Value3.02.05.06.0
Percentage of OtherPostretirementBenefitsPayments100.0100.0100.0100.0

us-gaap:PaymentsForProceedsFromOtherInvestingActivities

us-gaap:PaymentsForProceedsFromOtherInvestingActivities


Payments
Period End2021-06-302021-03-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.01.00.00.01.0-29.039-12.0-2.0-4.0-81.0744.0216.0-1.03.00.00.0-2.050-23.0-1.02.0-14.0245.0-5.0-1.0-19.0-7.0-8.039-108.04712-1.038-38.0-13.025-14.02511
Percentage of PaymentsForProceedsFromOtherInvestingActivities0.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsToAcquireBusinessesNetOfCashAcquired

us-gaap:PaymentsToAcquireBusinessesNetOfCashAcquired


Payments
Period End2020-12-312020-09-302019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-312014-12-312013-12-312012-12-312011-12-31
Value0.04.02930.00.00.00.00.0214.0630.018280.00.09020.09.00.02274470
Percentage of PaymentsToAcquireBusinessesNetOfCashAcquired0.0100.0100.00.00.00.00.00.0100.0100.0100.00.0100.00.00.0100.00.0100.00.0100.0100.0

us-gaap:PaymentsToAcquireOilAndGasProperty us-gaap:StatementGeographical

us-gaap:PaymentsToAcquireOilAndGasProperty

mro:EagleFord


Payments
Period End2020-09-30
Value191
Percentage of PaymentsToAcquireOilAndGasProperty100.0

us-gaap:PensionContributions us-gaap:RetirementPlanFundingStatus

us-gaap:PensionContributions

us-gaap:FundedPlan


Pension
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value7.07.09.06.06.06.01118
Percentage of PensionContributions100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:UnfundedPlan


Pension
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value3.09.05.01.01.02.0
Percentage of PensionContributions33.3150.083.316.79.111.1

us-gaap:ProceedsFromIncomeTaxRefunds

us-gaap:ProceedsFromIncomeTaxRefunds


Proceeds
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.0891.03.01.00.0845.0
Percentage of ProceedsFromIncomeTaxRefunds0.0100.0100.0100.0100.00.0100.0100.0

us-gaap:ProceedsFromIncomeTaxRefunds us-gaap:SubsequentEventType

us-gaap:SubsequentEvent


Proceeds
Period End2020-08-06
Value89
Percentage of ProceedsFromIncomeTaxRefunds0.0

us-gaap:ProceedsFromIssuanceOfDebt us-gaap:DebtInstrument

us-gaap:ProceedsFromIssuanceOfDebt

mro:St.JohntheBaptistParishStateofLouisianaRevenueBondsDue2037


Proceeds
Period End2020-08-18
Value400
Percentage of ProceedsFromIssuanceOfDebt100.0

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities


Proceeds
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-1.0-3.00.01.0-5.0-2.0-1.0-1.01.04.0162.00.00.01.0-1.01.00.00.00.00.03.07.04.03.064779.023242521236.03.017-51.03.0106203.03.03.02.0
Percentage of ProceedsFromPaymentsForOtherFinancingActivities100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PropertyPlantAndEquipmentAdditions

us-gaap:PropertyPlantAndEquipmentAdditions


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value289184267177139568601675701614697704662622638554599359284249177359561595678110216621508128211091708102511191216
Percentage of PropertyPlantAndEquipmentAdditions100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PropertyPlantAndEquipmentAdditions us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value3.01.03.01.02.07.010.07.05.03.09.07.05.05.07.09.0
Percentage of PropertyPlantAndEquipmentAdditions1.00.51.10.61.41.21.71.00.70.51.31.00.80.81.11.6

us-gaap:PropertyPlantAndEquipmentAdditions us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, mro:InternationalExplorationAndProduction


Property
Period End2021-06-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value2.00.00.00.01.010.05.0116.0166.0154.0149.0
Percentage of PropertyPlantAndEquipmentAdditions0.70.00.00.00.11.40.81.60.92.41.02.40.72.32.5

us-gaap:OperatingSegments, mro:NorthAmericaExplorationAndProduction


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value284183263176137561591667686606677691641611616541575349
Percentage of PropertyPlantAndEquipmentAdditions98.399.598.599.498.698.898.398.897.998.797.198.296.898.296.697.796.097.2

us-gaap:ProvisionForDoubtfulAccounts

us-gaap:ProvisionForDoubtfulAccounts


Provision
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value-4.02.00.016-2.08.0
Percentage of ProvisionForDoubtfulAccounts100.0100.00.0100.0100.0100.0

us-gaap:ProvisionForDoubtfulAccounts us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType

mro:JointInterestBillingJIBReceivables


Provision
Period End2020-12-312020-09-302019-03-31
Value2.03.06.0
Percentage of ProvisionForDoubtfulAccounts0.018.80.0

mro:JointInterestBillingReceivables


Provision
Period End2021-03-31
Value1.0
Percentage of ProvisionForDoubtfulAccounts50.0

us-gaap:TradeAccountsReceivable


Provision
Period End2021-03-312020-12-312020-09-302019-03-31
Value1.0-2.0132.0
Percentage of ProvisionForDoubtfulAccounts50.00.081.20.0

us-gaap:RepaymentsOfDebt us-gaap:DebtInstrument

us-gaap:RepaymentsOfDebt

mro:AggregateMaximumTender


Repayments
Period End2020-10-31
Value500
Percentage of RepaymentsOfDebt100.0

us-gaap:RepaymentsOfDebt us-gaap:DebtInstrument, us-gaap:SubsequentEventType

mro:AggregateMaximumTender, us-gaap:SubsequentEvent


Repayments
Period End2020-10-01
Value500
Percentage of RepaymentsOfDebt0.0

us-gaap:ResultsOfOperationsProductionOrLiftingCosts

us-gaap:ResultsOfOperationsProductionOrLiftingCosts


Results
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312017-09-30
Value126121137129129160169163193187205215205188197
Percentage of ResultsOfOperationsProductionOrLiftingCosts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ResultsOfOperationsProductionOrLiftingCosts us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, mro:InternationalExplorationAndProduction


Results
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312017-09-30
Value1310.016111517141646505343525976
Percentage of ResultsOfOperationsProductionOrLiftingCosts10.38.311.78.511.610.68.39.823.826.725.920.025.431.438.6

us-gaap:OperatingSegments, mro:NorthAmericaExplorationAndProduction


Results
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312017-09-30
Value113111119118114143155147147139149172153128121
Percentage of ResultsOfOperationsProductionOrLiftingCosts89.791.786.991.588.489.491.790.276.274.372.780.074.668.161.4

us-gaap:ResultsOfOperationsTransportationCosts

us-gaap:ResultsOfOperationsTransportationCosts


Results
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value167152183105144143138170154167152126130122109
Percentage of ResultsOfOperationsTransportationCosts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ResultsOfOperationsTransportationCosts us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Results
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value124.028131.04.00.0131.07.00.0-1.00.00.0-2.0
Percentage of ResultsOfOperationsTransportationCosts7.22.615.312.40.72.80.07.60.64.20.0-0.80.00.0-1.8

us-gaap:ResultsOfOperationsTransportationCosts us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, mro:InternationalExplorationAndProduction


Results
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value2.04.01.01.03.02.01.010.013251610.0191831
Percentage of ResultsOfOperationsTransportationCosts1.22.60.51.02.11.40.75.98.415.010.57.914.614.828.4

us-gaap:OperatingSegments, mro:NorthAmericaExplorationAndProduction


Results
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value1531441549114013713714714013513611711110480
Percentage of ResultsOfOperationsTransportationCosts91.694.784.286.797.295.899.386.590.980.889.592.985.485.273.4

us-gaap:RevenueFromRelatedParties

us-gaap:RevenueFromRelatedParties


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value8.08.09.09.010.010.010.01111151613141516143776151420
Percentage of RevenueFromRelatedParties100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:SeveranceCosts1

us-gaap:SeveranceCosts1


Severance
Period End2021-03-312020-12-312020-09-302015-12-312015-09-30
Value112.02.08.04.0
Percentage of SeveranceCosts1100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue

mro:RestrictedStockAwardsAndRestrictedStockUnits


Share
Period End2021-06-302021-03-31
Value-0.0312.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue

mro:PerformanceUnitCashSettlement


Share
Period End2021-06-302021-03-31
Value5.9621.36
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue100.0100.0

mro:PerformanceUnitShareSettlement


Share
Period End2021-06-302021-03-31
Value018.07
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue0.084.6

mro:RestrictedStockAwardsAndRestrictedStockUnits


Share
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value011.2008.55-0.06-0.0216.98
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue0.052.40.00.00.00.00.00.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue us-gaap:TitleOfIndividual, us-gaap:AwardType

mro:GrantedOfficer, mro:PerformanceUnit


Share
Period End2020-09-302020-06-302020-03-312019-09-30
Value0010.550
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue0.00.00.00.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue

mro:RestrictedStockAwardsAndRestrictedStockUnits


Share
Period End2021-06-302021-03-31
Value0.0212.54
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice


Share
Period End2021-06-302021-03-31
Value5.1417.68
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice100.0100.0

us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice


Share
Period End2021-06-302021-03-31
Value-0.097.43
Percentage of ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice100.0100.0

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage us-gaap:Range, us-gaap:AwardType

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage

srt:Maximum, us-gaap:PerformanceShares


Sharebased
Period End2021-06-302021-03-31
Value0200.0
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage0.0100.0

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation


Stock
Period End2021-06-302021-03-312020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312011-12-312011-09-30
Value9.0-5.0-8.038-5.02.0621425655.050
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Stock
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312011-12-312011-09-30
Value1.010.02.020-83.09.05.0-39.0-7.0-15.0-93.0-1.0-26.0
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation11.1-200.00.0-250.0-218.4-180.0250.0-62.9-50.0-60.0-143.1-20.0-52.0

us-gaap:TreasuryStock


Stock
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312011-12-312011-09-30
Value8.0-15.0-2.0-28.0121-14.0-3.010121401586.076
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation88.9300.00.0350.0318.4280.0-150.0162.9150.0160.0243.1120.0152.0

us-gaap:TaxesExcludingIncomeAndExciseTaxes

us-gaap:TaxesExcludingIncomeAndExciseTaxes


Taxes
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value7474554930667981797284866564554445394239394843467867871151099884919384816367786059531222884452115
Percentage of TaxesExcludingIncomeAndExciseTaxes100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:TaxesExcludingIncomeAndExciseTaxes us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Taxes
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value-2.06.01.00.00.01.01.00.0-2.01.00.0-3.00.0-2.00.0
Percentage of TaxesExcludingIncomeAndExciseTaxes-2.710.92.00.00.01.31.20.0-2.81.20.0-4.60.0-3.60.0

us-gaap:TaxesExcludingIncomeAndExciseTaxes us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, mro:NorthAmericaExplorationAndProduction


Taxes
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value767449483066788079748386686457443339
Percentage of TaxesExcludingIncomeAndExciseTaxes102.7100.089.198.0100.0100.098.798.8100.0102.898.8100.0104.6100.0103.6100.073.3100.0

us-gaap:TreasuryStockSharesAcquired us-gaap:ShareRepurchaseProgram

us-gaap:TreasuryStockSharesAcquired

mro:ShareRepurchaseProgram


Treasury
Period End2020-12-31
Value0.0
Percentage of TreasuryStockSharesAcquired0.0

us-gaap:TreasuryStockValueAcquiredCostMethod

us-gaap:TreasuryStockValueAcquiredCostMethod


Treasury
Period End2021-03-312020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312013-09-302011-12-312011-09-30
Value9.09130236303633392.08.02.05001.0300
Percentage of TreasuryStockValueAcquiredCostMethod100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:TreasuryStockValueAcquiredCostMethod us-gaap:ShareRepurchaseProgram

mro:ShareRepurchaseProgram


Treasury
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-09-30
Value0.00.00.085653023614338
Percentage of TreasuryStockValueAcquiredCostMethod0.00.00.093.40.0100.0100.046.799.7

us-gaap:TreasuryStockValueAcquiredCostMethod us-gaap:StatementEquityComponents

us-gaap:TreasuryStock


Treasury
Period End2021-03-312020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312011-12-312011-09-30
Value9.09130236303633392.08.02.01.0310
Percentage of TreasuryStockValueAcquiredCostMethod100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0103.3

us-gaap:UnrealizedGainLossOnDerivatives

us-gaap:UnrealizedGainLossOnDerivatives


Unrealized
Period End2021-06-302021-03-312020-06-302020-03-31
Value-75.0-82.0-96.0171
Percentage of UnrealizedGainLossOnDerivatives100.0100.0100.0100.0

us-gaap:UnrealizedGainLossOnDerivativesAndCommodityContracts us-gaap:DerivativeInstrumentRisk

us-gaap:UnrealizedGainLossOnDerivativesAndCommodityContracts

us-gaap:CommodityContract


Unrealized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value-75.0-82.0-66.0-36.0-96.0171-55.03311
Percentage of UnrealizedGainLossOnDerivativesAndCommodityContracts100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:EntityCommonStockSharesOutstanding

dei:EntityCommonStockSharesOutstanding


Entity
Period End2021-02-12
Value789
Percentage of EntityCommonStockSharesOutstanding100.0

mro:AllowanceForCreditLosses

mro:AllowanceForCreditLosses


Allowance
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value1924222511
Percentage of AllowanceForCreditLosses100.0100.0100.0100.0100.0

mro:CommitmentsToAcquirePropertyPlantAndEquipment

mro:CommitmentsToAcquirePropertyPlantAndEquipment


Commitments
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312012-09-302012-06-302011-12-312010-12-312009-12-31
Value15415710214437174712709499741021268326502938
Percentage of CommitmentsToAcquirePropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mro:ContingentCapitalAndExpenseReceivableNoncurrent

mro:ContingentCapitalAndExpenseReceivableNoncurrent


Contingent
Period End2021-06-302021-03-312020-12-312020-09-30
Value24232323
Percentage of ContingentCapitalAndExpenseReceivableNoncurrent100.0100.0100.0100.0

mro:ContingentRoyaltyLiability

mro:ContingentRoyaltyLiability


Contingent
Period End2021-06-302021-03-312020-12-312020-09-30
Value121114107103
Percentage of ContingentRoyaltyLiability100.0100.0100.0100.0

mro:ContingentRoyaltyLiability us-gaap:BalanceSheetLocation

us-gaap:AccountsPayable


Contingent
Period End2021-06-302021-03-31
Value111104
Percentage of ContingentRoyaltyLiability91.791.2

mro:DebtImmediatelyDueIfChangeInControl

mro:DebtImmediatelyDueIfChangeInControl


Debt
Period End2020-12-31
Value236
Percentage of DebtImmediatelyDueIfChangeInControl100.0

mro:DebtInstrumentCovenantRatioOfIndebtednessToNetCapitalMaximum us-gaap:CreditFacility

mro:DebtInstrumentCovenantRatioOfIndebtednessToNetCapitalMaximum

us-gaap:RevolvingCreditFacility


Debt
Period End2020-12-31
Value65.0
Percentage of DebtInstrumentCovenantRatioOfIndebtednessToNetCapitalMaximum100.0

mro:DeferredCreditAndOtherLiabilities

mro:DeferredCreditAndOtherLiabilities


Deferred
Period End2021-06-302020-12-31
Value137194
Percentage of DeferredCreditAndOtherLiabilities100.0100.0

mro:Deferredcreditandotherliabilities

mro:Deferredcreditandotherliabilities


Deferredcreditandotherliabilities
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-31
Value171194198217220234265292317279340194197217217211221244297314283308225288
Percentage of Deferredcreditandotherliabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mro:DefinedBenefitPlanFairValueofPlanAssetsBeforeCommingledFunds us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

mro:DefinedBenefitPlanFairValueofPlanAssetsBeforeCommingledFunds

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring


Defined
Period End2020-12-312019-12-31
Value61102
Percentage of DefinedBenefitPlanFairValueofPlanAssetsBeforeCommingledFunds100.0100.0

us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring


Defined
Period End2020-12-312019-12-31
Value2633
Percentage of DefinedBenefitPlanFairValueofPlanAssetsBeforeCommingledFunds42.632.4

mro:DefinedBenefitPlanFairValueofPlanAssetsBeforeCommingledFunds us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsRecurring


Defined
Period End2020-12-312019-12-31
Value87148
Percentage of DefinedBenefitPlanFairValueofPlanAssetsBeforeCommingledFunds142.6145.1

mro:DerivativeSoldPut us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

mro:DerivativeSoldPut

mro:ThreeWayCollarsCrudeOil2021Q2, us-gaap:Nondesignated


Derivative
Period End2021-03-312020-12-31
Value29.7527.0
Percentage of DerivativeSoldPut100.0100.0

mro:ThreeWayCollarsCrudeOil2021Q3, us-gaap:Nondesignated


Derivative
Period End2021-06-302021-03-31
Value38.7537.5
Percentage of DerivativeSoldPut0.0126.1

mro:ThreeWayCollarsCrudeOil2022FirstHalf, us-gaap:Nondesignated


Derivative
Period End2021-06-30
Value40.0
Percentage of DerivativeSoldPut0.0

mro:DerivativeSoldPut us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation, us-gaap:SubsequentEventType

mro:ThreeWayCollarsCrudeOil2021Q2, us-gaap:Nondesignated, us-gaap:SubsequentEvent


Derivative
Period End2021-02-15
Value30.67
Percentage of DerivativeSoldPut0.0

mro:ThreeWayCollarsCrudeOil2021Q3, us-gaap:Nondesignated, us-gaap:SubsequentEvent


Derivative
Period End2021-02-15
Value35.0
Percentage of DerivativeSoldPut0.0

mro:EstimatedMakeWholeProvisionPremium us-gaap:Range, us-gaap:DebtInstrument

mro:EstimatedMakeWholeProvisionPremium

srt:Maximum, mro:SeniorUnsecuredNotes3850Due2025


Estimated
Period End2021-06-30
Value105
Percentage of EstimatedMakeWholeProvisionPremium100.0

srt:Minimum, mro:SeniorUnsecuredNotes3850Due2025


Estimated
Period End2021-06-30
Value85
Percentage of EstimatedMakeWholeProvisionPremium81.0

mro:FinancialAssetsFairValueDisclosure us-gaap:FairValueByMeasurementBasis

mro:FinancialAssetsFairValueDisclosure

us-gaap:CarryingReportedAmountFairValueDisclosure


Financial
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value3941415348444239353594101137147922882860297128118206120118116133134129189159147147165164186
Percentage of FinancialAssetsFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EstimateOfFairValueFairValueDisclosure


Financial
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value252728393225303329298997133144921882857294126112198115104109134135132194166154154168165189
Percentage of FinancialAssetsFairValueDisclosure64.165.968.373.666.756.871.484.682.982.994.796.097.198.099.9100.099.799.098.494.996.195.888.194.0100.8100.7102.3102.6104.4104.8104.8101.8100.6101.6

mro:InventorySuppliesAndSundry

mro:InventorySuppliesAndSundry


Inventory
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value666566666866626263718599106100117123129139196195241273278285286325299299304337309314320314288252236223214207219400404439
Percentage of InventorySuppliesAndSundry100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mro:LesseeFinanceLeaseMaximumFinancingAvailable

mro:LesseeFinanceLeaseMaximumFinancingAvailable


Lessee
Period End2021-06-302021-03-312020-12-312020-09-302020-07-31
Value340340340340380
Percentage of LesseeFinanceLeaseMaximumFinancingAvailable100.0100.0100.0100.0100.0

mro:LesseeFinanceLeaseTotalCostsIncurred

mro:LesseeFinanceLeaseTotalCostsIncurred


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value214182144117
Percentage of LesseeFinanceLeaseTotalCostsIncurred100.0100.0100.0100.0

mro:LiquidHydrocarbonsNaturalGas

mro:LiquidHydrocarbonsNaturalGas


Liquid
Period End2020-12-312020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value10.01210.09.09.01211111110.09.09.0116.06.0
Percentage of LiquidHydrocarbonsNaturalGas100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mro:OtherCurrentLiabilitiesFairValueDisclosure us-gaap:FairValueByMeasurementBasis

mro:OtherCurrentLiabilitiesFairValueDisclosure

us-gaap:CarryingReportedAmountFairValueDisclosure


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value12410910399979590
Percentage of OtherCurrentLiabilitiesFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0

us-gaap:EstimateOfFairValueFairValueDisclosure


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value93767262614262
Percentage of OtherCurrentLiabilitiesFairValueDisclosure75.069.769.962.662.944.268.9

mro:OtherNoncurrentAssetsFairValueDisclosure us-gaap:FairValueByMeasurementBasis

mro:OtherNoncurrentAssetsFairValueDisclosure

us-gaap:CarryingReportedAmountFairValueDisclosure


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value27373749444038353132818689132161128107287121118206120118116133134129189159147147165164186
Percentage of OtherNoncurrentAssetsFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EstimateOfFairValueFairValueDisclosure


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value12232435282226292525768285129159127104284119112198115104109134135132194166154154168165189
Percentage of OtherNoncurrentAssetsFairValueDisclosure44.462.264.971.463.655.068.482.980.678.193.895.395.597.798.899.297.299.098.394.996.195.888.194.0100.8100.7102.3102.6104.4104.8104.8101.8100.6101.6

mro:OverrideRoyaltyGOMFutureAbandonment

mro:OverrideRoyaltyGOMFutureAbandonment


Override
Period End2020-12-31
Value70
Percentage of OverrideRoyaltyGOMFutureAbandonment100.0

mro:SharebasedCompensationArrangementbySharebasedPaymentAwardOptionsExpectedtoVestExercisableWeightedAverageExercisePrice us-gaap:AwardType

mro:SharebasedCompensationArrangementbySharebasedPaymentAwardOptionsExpectedtoVestExercisableWeightedAverageExercisePrice

us-gaap:EmployeeStockOption


Sharebased
Period End2020-12-31
Value12.5
Percentage of SharebasedCompensationArrangementbySharebasedPaymentAwardOptionsExpectedtoVestExercisableWeightedAverageExercisePrice100.0

us-gaap:AccountsPayableRelatedPartiesCurrent

us-gaap:AccountsPayableRelatedPartiesCurrent


Accounts
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value13111514115.0112020
Percentage of AccountsPayableRelatedPartiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccountsReceivableRelatedPartiesCurrent

us-gaap:AccountsReceivableRelatedPartiesCurrent


Accounts
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value242825242329313027
Percentage of AccountsReceivableRelatedPartiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AllowanceForDoubtfulAccountsReceivable

us-gaap:AllowanceForDoubtfulAccountsReceivable


Allowance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value19242225233011
Percentage of AllowanceForDoubtfulAccountsReceivable100.0100.0100.0100.0100.0100.0100.0

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent


Allowance
Period End2020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-312012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value22233011121212118.08.09.0127.05.05.06.04.04.04.04.04.04.04.03.00.00.00.02.02.07.07.014
Percentage of AllowanceForDoubtfulAccountsReceivableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0100.0100.0100.0100.0100.0

us-gaap:AociDerivativeQualifyingAsHedgeExcludedComponentAfterTax us-gaap:DerivativeInstrumentRisk

us-gaap:AociDerivativeQualifyingAsHedgeExcludedComponentAfterTax

us-gaap:InterestRateContract


Aoci
Period End2020-12-312020-09-30
Value2000000.0-10000000.0
Percentage of AociDerivativeQualifyingAsHedgeExcludedComponentAfterTax100.0100.0

us-gaap:AssetRetirementObligation

us-gaap:AssetRetirementObligation


Asset
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-312016-09-302015-12-312014-12-312014-09-302014-06-302013-12-312013-09-302013-06-302012-12-312011-12-312010-12-312009-12-312008-12-31
Value2962622542482522472542162072101145130114151497148315821748153316351958203418292096212020791783151013551102965
Percentage of AssetRetirementObligation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssetRetirementObligation us-gaap:StatementGeographical

mro:GulfOfMexico


Asset
Period End2021-06-302020-12-31
Value297.0
Percentage of AssetRetirementObligation9.82.8

us-gaap:AssetRetirementObligationCurrent

us-gaap:AssetRetirementObligationCurrent


Asset
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-312016-09-302015-12-312014-12-312014-09-302013-12-312013-09-302012-12-312010-12-312009-12-31
Value2411131210.0111118181864585152556050213441318793341.03.0
Percentage of AssetRetirementObligationCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssetRetirementObligationCurrent us-gaap:StatementGeographical

mro:GulfOfMexico


Asset
Period End2021-06-30
Value14
Percentage of AssetRetirementObligationCurrent58.3

us-gaap:AssetRetirementObligationsNoncurrent

us-gaap:AssetRetirementObligationsNoncurrent


Asset
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value2722512412362422362431981891921081124313641445142815221642162216971607159716141601196519631949191720031804206220092027203917951749151614891437151013371336136813541099
Percentage of AssetRetirementObligationsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CapitalizedExploratoryWellCosts

us-gaap:CapitalizedExploratoryWellCosts


Capitalized
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-312007-12-31
Value210278297295249437610793617704657829917783
Percentage of CapitalizedExploratoryWellCosts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CapitalizedExploratoryWellCostsThatHaveBeenCapitalizedForPeriodGreaterThanOneYear

us-gaap:CapitalizedExploratoryWellCostsThatHaveBeenCapitalizedForPeriodGreaterThanOneYear


Capitalized
Period End2021-06-302021-03-312020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312014-09-302014-06-302013-12-312013-09-302012-12-312011-12-312010-12-312009-12-312008-12-31
Value158145980.00.00.00.00.00.00.032323232329611811811811812085888812615510228122022922232315054
Percentage of CapitalizedExploratoryWellCostsThatHaveBeenCapitalizedForPeriodGreaterThanOneYear100.0100.0100.00.00.00.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-06-302018-03-312017-12-31
Value97011257421119522817858116512961342146216671613563
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ContractWithCustomerReceivableAfterAllowanceForCreditLoss

us-gaap:ContractWithCustomerReceivableAfterAllowanceForCreditLoss


Contract
Period End2020-12-312019-12-31
Value572837
Percentage of ContractWithCustomerReceivableAfterAllowanceForCreditLoss100.0100.0

us-gaap:CrudeOilAndNaturalGasLiquids

us-gaap:CrudeOilAndNaturalGasLiquids


Crude
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value121310.0119.010.0
Percentage of CrudeOilAndNaturalGasLiquids100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrumentCarryingAmount

us-gaap:DebtInstrumentCarryingAmount


Debt
Period End2020-12-312019-12-31
Value54365536
Percentage of DebtInstrumentCarryingAmount100.0100.0

us-gaap:DebtInstrumentCarryingAmount us-gaap:DebtInstrument, us-gaap:LongtermDebtType

mro:Bonds2125Due2037, us-gaap:Bonds


Debt
Period End2020-12-31
Value200
Percentage of DebtInstrumentCarryingAmount3.7

mro:Bonds2375Due2037, us-gaap:Bonds


Debt
Period End2020-12-31
Value200
Percentage of DebtInstrumentCarryingAmount3.7

mro:SeniorUnsecuredNotes2800Due2022, us-gaap:UnsecuredDebt


Debt
Period End2020-12-312019-12-31
Value5001000
Percentage of DebtInstrumentCarryingAmount9.218.1

us-gaap:DebtInstrumentUnamortizedDiscount

us-gaap:DebtInstrumentUnamortizedDiscount


Debt
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value5.07.08.010.09.010.08.09.011-10.0-16.0-20.0
Percentage of DebtInstrumentUnamortizedDiscount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtLongtermAndShorttermCombinedAmount

us-gaap:DebtLongtermAndShorttermCombinedAmount


Debt
Period End2021-06-302021-03-312020-06-30
Value490049005500
Percentage of DebtLongtermAndShorttermCombinedAmount100.0100.0100.0

us-gaap:DeferredIncomeTaxLiabilities

us-gaap:DeferredIncomeTaxLiabilities


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value1912190110811416374034813870487945434661
Percentage of DeferredIncomeTaxLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsGross

us-gaap:DeferredTaxAssetsGross


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-09-302014-12-31
Value269724142024199859391115525
Percentage of DeferredTaxAssetsGross100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsNotSubjectToExpiration us-gaap:IncomeTaxAuthority

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsNotSubjectToExpiration

us-gaap:DomesticCountry


Deferred
Period End2020-12-31
Value1100
Percentage of DeferredTaxAssetsOperatingLossCarryforwardsNotSubjectToExpiration100.0

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration us-gaap:IncomeTaxAuthority

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration

us-gaap:DomesticCountry


Deferred
Period End2020-12-31
Value655
Percentage of DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration100.0

us-gaap:ForeignCountry


Deferred
Period End2020-12-31
Value14
Percentage of DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration2.1

us-gaap:StateAndLocalJurisdiction


Deferred
Period End2020-12-31
Value184
Percentage of DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration28.1

us-gaap:DeferredTaxAssetsOther

us-gaap:DeferredTaxAssetsOther


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value43275.06988731169812188141177
Percentage of DeferredTaxAssetsOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsTaxCreditCarryforwardsForeign

us-gaap:DeferredTaxAssetsTaxCreditCarryforwardsForeign


Deferred
Period End2020-12-312019-12-312012-12-312011-12-312010-12-312009-12-31
Value6116114351300520451934
Percentage of DeferredTaxAssetsTaxCreditCarryforwardsForeign100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value77901021112282603643875104131079
Percentage of DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value189218611018133236723376373740183691328356635862
Percentage of DeferredTaxLiabilitiesPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxLiabilitiesTaxDeferredIncome

us-gaap:DeferredTaxLiabilitiesTaxDeferredIncome


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value2040608175
Percentage of DeferredTaxLiabilitiesTaxDeferredIncome100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanAccumulatedBenefitObligation us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAccumulatedBenefitObligation

country:US, us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-31
Value8089
Percentage of DefinedBenefitPlanAccumulatedBenefitObligation100.0100.0

country:US, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-31
Value298343
Percentage of DefinedBenefitPlanAccumulatedBenefitObligation372.5385.4

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax

country:US, us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-31
Value-24.0-23.0
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax100.0100.0

country:US, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-31
Value-72.0-85.0
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax300.0369.6

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax

country:US, us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-31
Value-97.0-129.0
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax100.0100.0

country:US, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-31
Value-19.0-29.0
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax19.622.5

us-gaap:DefinedBenefitPlanAmountsRecognizedInBalanceSheet us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAmountsRecognizedInBalanceSheet

country:US, us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-31
Value-80.0-89.0
Percentage of DefinedBenefitPlanAmountsRecognizedInBalanceSheet100.0100.0

country:US, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-31
Value-114.0-118.0
Percentage of DefinedBenefitPlanAmountsRecognizedInBalanceSheet142.5132.6

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate

country:US, us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-31
Value2.022.914.09
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate100.0100.0100.0

country:US, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-31
Value2.523.134.26
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate124.8107.6104.2

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease

country:US, us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-31
Value0.54.54.0
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease100.0100.0100.0

country:US, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-31
Value0.54.54.0
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease100.0100.0100.0

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease us-gaap:StatementScenario, us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

srt:ScenarioForecast, country:US, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-12-31
Value4.5
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease0.0

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationWeightedAverageInterestCreditingRate us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationWeightedAverageInterestCreditingRate

country:US, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-31
Value3.03.03.26
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationWeightedAverageInterestCreditingRate100.0100.0100.0

us-gaap:DefinedBenefitPlanBenefitObligation us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanBenefitObligation

country:US, us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-31
Value808996
Percentage of DefinedBenefitPlanBenefitObligation100.0100.0100.0

country:US, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-31
Value308354326
Percentage of DefinedBenefitPlanBenefitObligation385.0397.8339.6

us-gaap:DefinedBenefitPlanExpectedAmortizationOfGainLossNextFiscalYear us-gaap:StatementScenario

us-gaap:DefinedBenefitPlanExpectedAmortizationOfGainLossNextFiscalYear

srt:ScenarioForecast


Defined
Period End2020-12-31
Value-9000000.0
Percentage of DefinedBenefitPlanExpectedAmortizationOfGainLossNextFiscalYear100.0

us-gaap:DefinedBenefitPlanExpectedAmortizationOfGainLossNextFiscalYear us-gaap:StatementScenario, us-gaap:RetirementPlanType

srt:ScenarioForecast, us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-31
Value-2000000.0
Percentage of DefinedBenefitPlanExpectedAmortizationOfGainLossNextFiscalYear22.2

us-gaap:DefinedBenefitPlanExpectedAmortizationOfPriorServiceCostCreditNextFiscalYear us-gaap:StatementScenario

us-gaap:DefinedBenefitPlanExpectedAmortizationOfPriorServiceCostCreditNextFiscalYear

srt:ScenarioForecast


Defined
Period End2020-12-31
Value-7000000.0
Percentage of DefinedBenefitPlanExpectedAmortizationOfPriorServiceCostCreditNextFiscalYear100.0

us-gaap:DefinedBenefitPlanExpectedAmortizationOfPriorServiceCostCreditNextFiscalYear us-gaap:StatementScenario, us-gaap:RetirementPlanType

srt:ScenarioForecast, us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-31
Value-18000000.0
Percentage of DefinedBenefitPlanExpectedAmortizationOfPriorServiceCostCreditNextFiscalYear257.1

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value23252774
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-31
Value104
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter452.2

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value10.0181821
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-31
Value31
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths310.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value6.07.07.018
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-31
Value23
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive383.3

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value7.08.08.019
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-31
Value25
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour357.1

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value8.09.09.020
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-31
Value27
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree337.5

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value9.010.01820
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-31
Value28
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo311.1

us-gaap:DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear

us-gaap:DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear


Defined
Period End2020-12-31
Value40
Percentage of DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear100.0

us-gaap:DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear us-gaap:RetirementPlanType

mro:UnfundedPlans


Defined
Period End2020-12-31
Value3.0
Percentage of DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear7.5

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-31
Value10.0
Percentage of DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear25.0

us-gaap:DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear us-gaap:StatementScenario

srt:ScenarioForecast


Defined
Period End2020-12-31
Value28
Percentage of DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear70.0

us-gaap:DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear us-gaap:StatementScenario, us-gaap:RetirementPlanType

srt:ScenarioForecast, mro:UnfundedPlans


Defined
Period End2020-12-31
Value6.0
Percentage of DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear15.0

srt:ScenarioForecast, us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-31
Value18
Percentage of DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear45.0

us-gaap:DefinedBenefitPlanExpectedFutureEmployerContributionsRemainderOfFiscalYear

us-gaap:DefinedBenefitPlanExpectedFutureEmployerContributionsRemainderOfFiscalYear


Defined
Period End2021-06-302021-03-312020-09-30
Value9.0267.0
Percentage of DefinedBenefitPlanExpectedFutureEmployerContributionsRemainderOfFiscalYear100.0100.0100.0

us-gaap:DefinedBenefitPlanFundedStatusOfPlan us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanFundedStatusOfPlan

country:US, us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-31
Value-80.0-89.0
Percentage of DefinedBenefitPlanFundedStatusOfPlan100.0100.0

country:US, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-31
Value-114.0-118.0
Percentage of DefinedBenefitPlanFundedStatusOfPlan142.5132.6

us-gaap:DefinedBenefitPlanPlanAssetsTargetAllocationPercentage us-gaap:InvestmentType

us-gaap:DefinedBenefitPlanPlanAssetsTargetAllocationPercentage

us-gaap:EquitySecurities


Defined
Period End2020-12-31
Value55.0
Percentage of DefinedBenefitPlanPlanAssetsTargetAllocationPercentage100.0

us-gaap:FixedIncomeSecurities


Defined
Period End2020-12-31
Value45.0
Percentage of DefinedBenefitPlanPlanAssetsTargetAllocationPercentage81.8

us-gaap:DerivativeAssets us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:DerivativeAssets

us-gaap:CommodityContract, us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring


Derivative
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312013-09-302012-12-31
Value3.00.0290.00.00.00.02119480.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of DerivativeAssets100.00.0100.00.00.00.00.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommodityContract, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Derivative
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312013-09-302012-12-31
Value40881467.06130161060.00.00.010.060190.04.06.05151615.0235.052
Percentage of DerivativeAssets1333.30.0503.40.00.00.00.0504.80.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:DerivativeAssets us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:HedgingDesignation

us-gaap:InterestRateContract, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:DesignatedAsHedgingInstrument


Derivative
Period End2021-03-312020-12-312020-09-302019-12-31
Value48199.02.0
Percentage of DerivativeAssets0.00.0300.00.0

us-gaap:InterestRateContract, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:Nondesignated


Derivative
Period End2021-06-302021-03-312020-12-312020-09-30
Value625410.01.0
Percentage of DerivativeAssets0.00.00.033.3

us-gaap:DerivativeAssets us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementFrequency

us-gaap:CommodityContract, us-gaap:FairValueMeasurementsRecurring


Derivative
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312013-09-302012-12-31
Value43881757.061301612719480.010.060190.04.06.05151615.0235.053
Percentage of DerivativeAssets1433.30.0603.40.00.00.00.0604.8100.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:DerivativeAssets us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementFrequency, us-gaap:HedgingDesignation

us-gaap:InterestRateContract, us-gaap:FairValueMeasurementsRecurring, us-gaap:DesignatedAsHedgingInstrument


Derivative
Period End2021-03-312020-12-312020-09-302019-12-31
Value48199.02.0
Percentage of DerivativeAssets0.00.0300.00.0

us-gaap:InterestRateContract, us-gaap:FairValueMeasurementsRecurring, us-gaap:Nondesignated


Derivative
Period End2021-06-302021-03-312020-12-312020-09-30
Value625410.01.0
Percentage of DerivativeAssets0.00.00.033.3

us-gaap:DerivativeAssets us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring


Derivative
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value3.00.0290.00.00.00.02119480.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of DerivativeAssets100.00.0100.00.00.00.00.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value621022950901469.06130161060.00.00.00.010.01148668141863597616368.05.0111710.01791
Percentage of DerivativeAssets0.00.00.01666.70.0503.40.00.00.00.0504.80.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:DerivativeAssets us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsRecurring


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value621022953901759.061301612719480.00.010.01148668141863597616368.05.0111710.01792
Percentage of DerivativeAssets0.00.00.01766.70.0603.40.00.00.00.0604.8100.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:DerivativeAssetsLiabilitiesAtFairValueNet us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:DerivativeAssetsLiabilitiesAtFairValueNet

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring


Derivative
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312018-12-31
Value-30.0-16.03.0-9.0-29.03.0-21.0
Percentage of DerivativeAssetsLiabilitiesAtFairValueNet100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-31
Value-97.07.0-10.02864-126.0-9.0-106.0
Percentage of DerivativeAssetsLiabilitiesAtFairValueNet323.3-43.80.0933.3-711.1434.5-300.0504.8

us-gaap:DerivativeAssetsLiabilitiesAtFairValueNet us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsRecurring


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-31
Value-127.0-9.0-10.031551556.0-127.0
Percentage of DerivativeAssetsLiabilitiesAtFairValueNet423.356.20.01033.3-611.1-534.5200.0604.8

us-gaap:DerivativeAverageVariableInterestRate us-gaap:DerivativeInstrumentRisk

us-gaap:DerivativeAverageVariableInterestRate

mro:InterestRateContractMaturingJune12025


Derivative
Period End2021-03-312020-12-312020-09-302020-06-302020-03-31
Value0.950.950.950.00960.0096
Percentage of DerivativeAverageVariableInterestRate100.0100.0100.0100.0100.0

mro:InterestRateContractMaturingNovember12022


Derivative
Period End2021-03-312020-12-312020-09-302020-06-302020-03-31
Value0.990.990.990.00990.0104
Percentage of DerivativeAverageVariableInterestRate104.2104.2104.2103.1108.3

mro:InterestRateContractMaturingSeptember92026


Derivative
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value1.511.511.510.01510.01510.0151
Percentage of DerivativeAverageVariableInterestRate158.9158.9158.9157.3157.30.0

us-gaap:DerivativeAverageVariableInterestRate us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:LongtermDebtType, us-gaap:SubsequentEventType

us-gaap:InterestRateContract, us-gaap:CashFlowHedging, mro:NotesDue2025, us-gaap:SubsequentEvent


Derivative
Period End2020-08-06
Value0.009
Percentage of DerivativeAverageVariableInterestRate0.0

us-gaap:DerivativeAverageVariableInterestRate us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

mro:InterestRateContractMaturingJune12025, us-gaap:DesignatedAsHedgingInstrument


Derivative
Period End2020-12-31
Value0.95
Percentage of DerivativeAverageVariableInterestRate100.0

mro:InterestRateContractMaturingJune12025, us-gaap:Nondesignated


Derivative
Period End2021-06-30
Value0.95
Percentage of DerivativeAverageVariableInterestRate0.0

mro:InterestRateContractMaturingSeptember92026, us-gaap:DesignatedAsHedgingInstrument


Derivative
Period End2021-06-302020-12-31
Value1.521.51
Percentage of DerivativeAverageVariableInterestRate0.0158.9

mro:InterestRateContractMaturingSeptember92026, us-gaap:Nondesignated


Derivative
Period End2021-06-30
Value1.45
Percentage of DerivativeAverageVariableInterestRate0.0

us-gaap:DerivativeCapPrice us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

us-gaap:DerivativeCapPrice

mro:BasisSwapCrudeOil2021FirstHalf, us-gaap:Nondesignated


Derivative
Period End2020-09-30
Value52.37
Percentage of DerivativeCapPrice100.0

mro:BasisSwapCrudeOil2021SecondHalf, us-gaap:Nondesignated


Derivative
Period End2020-09-30
Value52.37
Percentage of DerivativeCapPrice100.0

mro:ThreeWayCollarsCrudeOil2021Q2, us-gaap:Nondesignated


Derivative
Period End2021-03-312020-12-31
Value61.4558.72
Percentage of DerivativeCapPrice0.00.0

mro:ThreeWayCollarsCrudeOil2021Q3, us-gaap:Nondesignated


Derivative
Period End2021-06-302021-03-31
Value74.0768.41
Percentage of DerivativeCapPrice0.00.0

mro:ThreeWayCollarsCrudeOil2021Q4, us-gaap:Nondesignated


Derivative
Period End2021-06-302021-03-31
Value78.0571.64
Percentage of DerivativeCapPrice0.00.0

mro:ThreeWayCollarsCrudeOil2022FirstHalf, us-gaap:Nondesignated


Derivative
Period End2021-06-30
Value87.84
Percentage of DerivativeCapPrice0.0

mro:TwoWayCollarsCrudeOil2020Q4, us-gaap:Nondesignated


Derivative
Period End2020-09-302020-06-30
Value46.830
Percentage of DerivativeCapPrice89.40.0

mro:TwoWayCollarsCrudeOil2021Q1, us-gaap:Nondesignated


Derivative
Period End2020-12-31
Value51.86
Percentage of DerivativeCapPrice0.0

mro:TwoWayCollarsCrudeOil2021Q3, us-gaap:Nondesignated


Derivative
Period End2021-06-302021-03-312020-12-31
Value59.4151.5451.54
Percentage of DerivativeCapPrice0.00.00.0

mro:TwoWayCollarsCrudeOil2021Q4, us-gaap:Nondesignated


Derivative
Period End2021-06-302021-03-312020-12-31
Value58.9251.5451.54
Percentage of DerivativeCapPrice0.00.00.0

mro:TwoWayCollarsNaturalGas2020Q4, us-gaap:Nondesignated


Derivative
Period End2020-09-302020-06-30
Value2.820
Percentage of DerivativeCapPrice5.40.0

mro:TwoWayCollarsNaturalGas2021FirstHalf, us-gaap:Nondesignated


Derivative
Period End2020-09-30
Value3.1
Percentage of DerivativeCapPrice5.9

mro:TwoWayCollarsNaturalGas2021Q1, us-gaap:Nondesignated


Derivative
Period End2020-12-31
Value3.14
Percentage of DerivativeCapPrice0.0

mro:TwoWayCollarsNaturalGas2021SecondHalf, us-gaap:Nondesignated


Derivative
Period End2020-09-30
Value3.03
Percentage of DerivativeCapPrice5.8

us-gaap:DerivativeCapPrice us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation, us-gaap:SubsequentEventType

mro:ThreeWayCollarsCrudeOil2021Q2, us-gaap:Nondesignated, us-gaap:SubsequentEvent


Derivative
Period End2021-02-15
Value62.36
Percentage of DerivativeCapPrice0.0

mro:ThreeWayCollarsCrudeOil2021Q3, us-gaap:Nondesignated, us-gaap:SubsequentEvent


Derivative
Period End2021-02-15
Value65.18
Percentage of DerivativeCapPrice0.0

mro:TwoWayCollarsCrudeOil2020Q3, us-gaap:Nondesignated, us-gaap:SubsequentEvent


Derivative
Period End2020-08-05
Value48.0
Percentage of DerivativeCapPrice0.0

mro:TwoWayCollarsCrudeOil2020Q4, us-gaap:Nondesignated, us-gaap:SubsequentEvent


Derivative
Period End2020-08-05
Value48.65
Percentage of DerivativeCapPrice0.0

mro:TwoWayCollarsCrudeOil2021, us-gaap:Nondesignated, us-gaap:SubsequentEvent


Derivative
Period End2020-08-05
Value52.37
Percentage of DerivativeCapPrice0.0

mro:TwoWayCollarsNaturalGas2020Q3, us-gaap:Nondesignated, us-gaap:SubsequentEvent


Derivative
Period End2020-08-05
Value2.49
Percentage of DerivativeCapPrice0.0

mro:TwoWayCollarsNaturalGas2020Q4, us-gaap:Nondesignated, us-gaap:SubsequentEvent


Derivative
Period End2020-08-05
Value2.62
Percentage of DerivativeCapPrice0.0

mro:TwoWayCollarsNaturalGas2021, us-gaap:Nondesignated, us-gaap:SubsequentEvent


Derivative
Period End2020-08-05
Value2.93
Percentage of DerivativeCapPrice0.0

mro:TwoWayCollarsNaturalGas2021FirstHalf, us-gaap:Nondesignated, us-gaap:SubsequentEvent


Derivative
Period End2020-11-03
Value3.13
Percentage of DerivativeCapPrice0.0

mro:TwoWayCollarsNaturalGas2021SecondHalf, us-gaap:Nondesignated, us-gaap:SubsequentEvent


Derivative
Period End2020-11-03
Value3.13
Percentage of DerivativeCapPrice0.0

us-gaap:DerivativeFairValueOfDerivativeAsset

us-gaap:DerivativeFairValueOfDerivativeAsset


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302017-09-302017-06-302016-12-312016-03-312015-12-312015-09-302015-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-03-312011-12-312010-12-31
Value631043969102176126410.0114686359763617582691924.05.090
Percentage of DerivativeFairValueOfDerivativeAsset100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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

us-gaap:OtherCurrentAssets, us-gaap:CommodityContract, us-gaap:Nondesignated


Derivative
Period End2020-12-312020-09-302020-06-302019-12-31
Value3.0591009.0
Percentage of DerivativeFairValueOfDerivativeAsset7.785.598.075.0

us-gaap:OtherCurrentLiabilities, us-gaap:CommodityContract, us-gaap:Nondesignated


Derivative
Period End2021-03-312020-12-312019-12-31
Value2.07.00.0
Percentage of DerivativeFairValueOfDerivativeAsset1.917.90.0

us-gaap:OtherNoncurrentAssets, us-gaap:InterestRateContract, us-gaap:CashFlowHedging


Derivative
Period End2021-03-312020-12-312020-09-302020-06-302019-12-31
Value48199.02.02.0
Percentage of DerivativeFairValueOfDerivativeAsset46.248.713.02.016.7

us-gaap:OtherNoncurrentAssets, us-gaap:InterestRateContract, us-gaap:Nondesignated


Derivative
Period End2021-06-302021-03-312020-12-312020-09-30
Value635410.01.0
Percentage of DerivativeFairValueOfDerivativeAsset100.051.925.61.4

us-gaap:DerivativeFairValueOfDerivativeAsset us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship

us-gaap:CashFlowHedging


Derivative
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value48199.02.00.02.00.0
Percentage of DerivativeFairValueOfDerivativeAsset46.248.713.02.00.016.70.0

us-gaap:Nondesignated


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value6356206010010.0
Percentage of DerivativeFairValueOfDerivativeAsset100.053.851.387.098.083.3

us-gaap:DerivativeFairValueOfDerivativeLiability

us-gaap:DerivativeFairValueOfDerivativeLiability


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-09-302017-12-312017-09-302017-06-302016-12-312016-03-312013-09-302013-06-302013-03-312012-09-302012-03-312010-12-31
Value190113493847216.07.02101405.00.060172830266.08.03.0
Percentage of DerivativeFairValueOfDerivativeLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeFairValueOfDerivativeLiability us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship

us-gaap:OtherCurrentAssets, us-gaap:CommodityContract, us-gaap:Nondesignated


Derivative
Period End2020-12-312020-09-302020-06-302019-12-31
Value1.014211.0
Percentage of DerivativeFairValueOfDerivativeLiability2.036.844.716.7

us-gaap:OtherCurrentLiabilities, us-gaap:CommodityContract, us-gaap:Nondesignated


Derivative
Period End2021-06-302021-03-312020-12-312019-12-31
Value181107325.0
Percentage of DerivativeFairValueOfDerivativeLiability95.394.765.383.3

us-gaap:OtherCurrentLiabilities, us-gaap:InterestRateContract, us-gaap:CashFlowHedging


Derivative
Period End2021-06-302021-03-31
Value2.01.0
Percentage of DerivativeFairValueOfDerivativeLiability1.10.9

us-gaap:OtherNoncurrentLiabilities, us-gaap:CommodityContract, us-gaap:Nondesignated


Derivative
Period End2020-09-30
Value2.0
Percentage of DerivativeFairValueOfDerivativeLiability5.3

us-gaap:OtherNoncurrentLiabilities, us-gaap:InterestRateContract, us-gaap:CashFlowHedging


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-09-30
Value6.05.0161926201.0
Percentage of DerivativeFairValueOfDerivativeLiability3.24.432.750.055.395.214.3

us-gaap:OtherNoncurrentLiabilities, us-gaap:InterestRateContract, us-gaap:Nondesignated


Derivative
Period End2021-06-302020-09-30
Value1.03.0
Percentage of DerivativeFairValueOfDerivativeLiability0.57.9

us-gaap:DerivativeFairValueOfDerivativeLiability us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship

us-gaap:CashFlowHedging


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value8.06.0161926200.01.0
Percentage of DerivativeFairValueOfDerivativeLiability4.25.332.750.055.395.20.014.3

us-gaap:Nondesignated


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value1821073319216.0
Percentage of DerivativeFairValueOfDerivativeLiability95.894.767.350.044.7100.0

us-gaap:DerivativeFairValueOfDerivativeNet

us-gaap:DerivativeFairValueOfDerivativeNet


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value-127.0-9.0-10.031556.0
Percentage of DerivativeFairValueOfDerivativeNet100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeFairValueOfDerivativeNet us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship

us-gaap:OtherCurrentAssets, us-gaap:CommodityContract, us-gaap:Nondesignated


Derivative
Period End2020-12-312020-09-302020-06-302019-12-31
Value2.045798.0
Percentage of DerivativeFairValueOfDerivativeNet-20.0145.2143.6133.3

us-gaap:OtherCurrentLiabilities, us-gaap:CommodityContract, us-gaap:Nondesignated


Derivative
Period End2021-06-302021-03-312020-12-312019-12-31
Value-181.0-105.0-25.0-5.0
Percentage of DerivativeFairValueOfDerivativeNet142.51166.7250.0-83.3

us-gaap:OtherCurrentLiabilities, us-gaap:InterestRateContract, us-gaap:CashFlowHedging


Derivative
Period End2021-06-302021-03-31
Value-2.0-1.0
Percentage of DerivativeFairValueOfDerivativeNet1.611.1

us-gaap:OtherNoncurrentAssets, us-gaap:InterestRateContract, us-gaap:CashFlowHedging


Derivative
Period End2021-03-312020-12-312020-09-302020-06-302019-12-31
Value48199.02.02.0
Percentage of DerivativeFairValueOfDerivativeNet-533.3-190.029.03.633.3

us-gaap:OtherNoncurrentAssets, us-gaap:InterestRateContract, us-gaap:Nondesignated


Derivative
Period End2021-06-302021-03-312020-12-312020-09-30
Value635410.01.0
Percentage of DerivativeFairValueOfDerivativeNet-49.6-600.0-100.03.2

us-gaap:OtherNoncurrentLiabilities, us-gaap:CommodityContract, us-gaap:Nondesignated


Derivative
Period End2020-09-30
Value-2.0
Percentage of DerivativeFairValueOfDerivativeNet-6.5

us-gaap:OtherNoncurrentLiabilities, us-gaap:InterestRateContract, us-gaap:CashFlowHedging


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-30
Value-6.0-5.0-16.0-19.0-26.0
Percentage of DerivativeFairValueOfDerivativeNet4.755.6160.0-61.3-47.3

us-gaap:OtherNoncurrentLiabilities, us-gaap:InterestRateContract, us-gaap:Nondesignated


Derivative
Period End2021-06-302020-09-30
Value-1.0-3.0
Percentage of DerivativeFairValueOfDerivativeNet0.8-9.7

us-gaap:DerivativeFairValueOfDerivativeNet us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

us-gaap:InterestRateContract, us-gaap:Nondesignated


Derivative
Period End2020-12-312020-09-302020-06-30
Value-2.0-2.0-7.0
Percentage of DerivativeFairValueOfDerivativeNet20.0-6.5-12.7

us-gaap:DerivativeFairValueOfDerivativeNet us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship

us-gaap:CashFlowHedging


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value-8.0423.0-10.0-24.02.0
Percentage of DerivativeFairValueOfDerivativeNet6.3-466.7-30.0-32.3-43.633.3

us-gaap:Nondesignated


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value-119.0-51.0-13.041794.0
Percentage of DerivativeFairValueOfDerivativeNet93.7566.7130.0132.3143.666.7

us-gaap:DerivativeFloorPrice us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

us-gaap:DerivativeFloorPrice

mro:BasisSwapCrudeOil2021FirstHalf, us-gaap:Nondesignated


Derivative
Period End2020-09-30
Value35.0
Percentage of DerivativeFloorPrice100.0

mro:BasisSwapCrudeOil2021SecondHalf, us-gaap:Nondesignated


Derivative
Period End2020-09-30
Value35.0
Percentage of DerivativeFloorPrice100.0

mro:ThreeWayCollarsCrudeOil2021Q2, us-gaap:Nondesignated


Derivative
Period End2021-03-312020-12-31
Value39.7537.0
Percentage of DerivativeFloorPrice0.00.0

mro:ThreeWayCollarsCrudeOil2021Q3, us-gaap:Nondesignated


Derivative
Period End2021-06-302021-03-31
Value48.7547.5
Percentage of DerivativeFloorPrice0.00.0

mro:ThreeWayCollarsCrudeOil2022FirstHalf, us-gaap:Nondesignated


Derivative
Period End2021-06-30
Value50.0
Percentage of DerivativeFloorPrice0.0

mro:TwoWayCollarsCrudeOil2020Q4, us-gaap:Nondesignated


Derivative
Period End2020-09-302020-06-30
Value37.00
Percentage of DerivativeFloorPrice105.70.0

mro:TwoWayCollarsCrudeOil2021Q1, us-gaap:Nondesignated


Derivative
Period End2020-12-31
Value35.44
Percentage of DerivativeFloorPrice0.0

mro:TwoWayCollarsCrudeOil2021Q3, us-gaap:Nondesignated


Derivative
Period End2021-06-302021-03-312020-12-31
Value39.2535.6735.67
Percentage of DerivativeFloorPrice0.00.00.0

mro:TwoWayCollarsCrudeOil2021Q4, us-gaap:Nondesignated


Derivative
Period End2021-06-302021-03-312020-12-31
Value39.2535.6735.67
Percentage of DerivativeFloorPrice0.00.00.0

mro:TwoWayCollarsNaturalGas2020Q4, us-gaap:Nondesignated


Derivative
Period End2020-09-302020-06-30
Value2.250
Percentage of DerivativeFloorPrice6.40.0

mro:TwoWayCollarsNaturalGas2021FirstHalf, us-gaap:Nondesignated


Derivative
Period End2020-09-30
Value2.46
Percentage of DerivativeFloorPrice7.0

mro:TwoWayCollarsNaturalGas2021Q1, us-gaap:Nondesignated


Derivative
Period End2020-12-31
Value2.52
Percentage of DerivativeFloorPrice0.0

mro:TwoWayCollarsNaturalGas2021SecondHalf, us-gaap:Nondesignated


Derivative
Period End2020-09-30
Value2.43
Percentage of DerivativeFloorPrice6.9

us-gaap:DerivativeFloorPrice us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation, us-gaap:SubsequentEventType

mro:ThreeWayCollarsCrudeOil2021Q2, us-gaap:Nondesignated, us-gaap:SubsequentEvent


Derivative
Period End2021-02-15
Value40.67
Percentage of DerivativeFloorPrice0.0

mro:ThreeWayCollarsCrudeOil2021Q3, us-gaap:Nondesignated, us-gaap:SubsequentEvent


Derivative
Period End2021-02-15
Value45.0
Percentage of DerivativeFloorPrice0.0

mro:TwoWayCollarsCrudeOil2020Q3, us-gaap:Nondesignated, us-gaap:SubsequentEvent


Derivative
Period End2020-08-05
Value36.5
Percentage of DerivativeFloorPrice0.0

mro:TwoWayCollarsCrudeOil2020Q4, us-gaap:Nondesignated, us-gaap:SubsequentEvent


Derivative
Period End2020-08-05
Value37.0
Percentage of DerivativeFloorPrice0.0

mro:TwoWayCollarsCrudeOil2021, us-gaap:Nondesignated, us-gaap:SubsequentEvent


Derivative
Period End2020-08-05
Value35.0
Percentage of DerivativeFloorPrice0.0

mro:TwoWayCollarsNaturalGas2020Q3, us-gaap:Nondesignated, us-gaap:SubsequentEvent


Derivative
Period End2020-08-05
Value2.0
Percentage of DerivativeFloorPrice0.0

mro:TwoWayCollarsNaturalGas2020Q4, us-gaap:Nondesignated, us-gaap:SubsequentEvent


Derivative
Period End2020-08-05
Value2.13
Percentage of DerivativeFloorPrice0.0

mro:TwoWayCollarsNaturalGas2021, us-gaap:Nondesignated, us-gaap:SubsequentEvent


Derivative
Period End2020-08-05
Value2.4
Percentage of DerivativeFloorPrice0.0

mro:TwoWayCollarsNaturalGas2021FirstHalf, us-gaap:Nondesignated, us-gaap:SubsequentEvent


Derivative
Period End2020-11-03
Value2.7
Percentage of DerivativeFloorPrice0.0

mro:TwoWayCollarsNaturalGas2021SecondHalf, us-gaap:Nondesignated, us-gaap:SubsequentEvent


Derivative
Period End2020-11-03
Value2.7
Percentage of DerivativeFloorPrice0.0

us-gaap:DerivativeLiabilities us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:DerivativeLiabilities

us-gaap:CommodityContract, us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring


Derivative
Period End2021-06-302021-03-312020-06-302019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302013-09-30
Value30169.03.03.05.02.00.00.0-2.0-20.02.00.00.00.00.00.00.00.00.00.00.0
Percentage of DerivativeLiabilities100.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommodityContract, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Derivative
Period End2021-06-302021-03-312020-12-312020-06-302019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302013-09-30
Value15189230.00.00.00.00.0229-276.0-182.0-120.03.00.02.0604370241.03.02614
Percentage of DerivativeLiabilities503.3556.20.00.00.00.00.00.00.00.09100.0600.0150.00.00.00.00.00.00.00.00.00.00.0

us-gaap:DerivativeLiabilities us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:HedgingDesignation

us-gaap:InterestRateContract, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:DesignatedAsHedgingInstrument


Derivative
Period End2021-06-302021-03-312020-12-312020-09-30
Value8.06.01619
Percentage of DerivativeLiabilities26.737.50.00.0

us-gaap:InterestRateContract, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:Nondesignated


Derivative
Period End2020-09-30
Value3.0
Percentage of DerivativeLiabilities0.0

us-gaap:DerivativeLiabilities us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementFrequency

us-gaap:CommodityContract, us-gaap:FairValueMeasurementsRecurring


Derivative
Period End2021-06-302021-03-312020-12-312020-06-302019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302013-09-30
Value181105239.03.03.05.02.0229-276.0-184.0-140.05.00.02.0604370241.03.02614
Percentage of DerivativeLiabilities603.3656.20.0100.0100.0100.0100.0100.00.00.09200.0700.0250.00.00.00.00.00.00.00.00.00.00.0

us-gaap:DerivativeLiabilities us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementFrequency, us-gaap:HedgingDesignation

us-gaap:InterestRateContract, us-gaap:FairValueMeasurementsRecurring, us-gaap:DesignatedAsHedgingInstrument


Derivative
Period End2021-06-302021-03-312020-12-312020-09-30
Value8.06.01619
Percentage of DerivativeLiabilities26.737.50.00.0

us-gaap:InterestRateContract, us-gaap:FairValueMeasurementsRecurring, us-gaap:Nondesignated


Derivative
Period End2020-09-30
Value3.0
Percentage of DerivativeLiabilities0.0

us-gaap:DerivativeLiabilities us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring


Derivative
Period End2021-06-302021-03-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-09-302014-06-302014-03-312013-12-312013-09-30
Value30169.00.0-3.03.0-5.0-2.00.00.00.0-2.0-20.02.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of DerivativeLiabilities100.0100.0100.00.0-100.0100.0-100.0-100.00.00.00.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Derivative
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Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-09-302014-06-302014-03-312013-12-312013-09-30
Value15995392226200.01.00.00.00.0229-276.0-182.0-120.03.00.02.0604370241.03.02617122.04.028
Percentage of DerivativeLiabilities530.0593.80.00.0288.90.00.033.30.00.00.00.00.09100.0600.0150.00.00.00.00.00.00.00.00.00.00.00.00.0