MRO


Line plots across dimensions of each concept
Tables

Table of contents



us-gaap:CommonStockValue

us-gaap:CommonStockSharesIssued

us-gaap:CommonStockSharesAuthorized

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareDiluted

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:CostsAndExpenses

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

us-gaap:OperatingIncomeLoss

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

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

us-gaap:IncomeTaxesPaidNet

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest

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

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:CashAndCashEquivalentsAtCarryingValue

us-gaap:AccountsReceivableNetCurrent

us-gaap:InventoryNet

us-gaap:OtherAssetsCurrent

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

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

us-gaap:Goodwill

us-gaap:OtherAssetsNoncurrent

us-gaap:LiabilitiesCurrent

us-gaap:AccountsPayableCurrent

us-gaap:AccruedIncomeTaxesCurrent

us-gaap:OtherLiabilitiesCurrent

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents

us-gaap:CommonStockValue

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:TreasuryStockValue

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities

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

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

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet

us-gaap:IncreaseDecreaseInInventories

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:PaymentsOfDividends

us-gaap:PaymentsOfDividends

us-gaap:PaymentsForRepurchaseOfCommonStock

us-gaap:EffectiveIncomeTaxRateContinuingOperations

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber

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

us-gaap:ShareBasedCompensation

mro:AssetRetirementObligationHeldForSale

mro:AssetRetirementObligationIncreaseDecreaseNoncashExcludingDispositions

mro:AssetRetirementObligationLiabilitiesTransferred
us-gaap:DerivativeInstrumentRisk
mro:DerivativeInstrumentNotDesignatedAsHedgingInstrumentsGainLossOnSettlementsNet
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
mro:DerivativeWeightedAverageCommodityPrice
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation, us-gaap:SubsequentEventType

mro:InvestmentsRepaymentsOfLoansAndReturnOfCapital

mro:NetInterestAndOther
us-gaap:ConsolidationItems

mro:NetSettlementOfDerivativeInstruments

mro:PaymentsforProceedsfromOtherProductiveAssets

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
us-gaap:StatementEquityComponents

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:AssetRetirementObligationAccretionExpense

us-gaap:AssetRetirementObligationLiabilitiesIncurred

us-gaap:AssetRetirementObligationLiabilitiesSettled

us-gaap:AssetRetirementObligationRevisionOfEstimate
us-gaap:FairValueByMeasurementFrequency
us-gaap:AssetsFairValueAdjustment

us-gaap:CapitalExpendituresIncurredButNotYetPaid

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:CommonStockDividendsPerShareCashPaid

us-gaap:CumulativeEffectOnRetainedEarningsNetOfTax1
us-gaap:StatementEquityComponents

us-gaap:DeferredIncomeTaxExpenseBenefit
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:DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents
us-gaap:RetirementPlanType
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanServiceCost

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

us-gaap:DividendsCommonStockCash
us-gaap:StatementEquityComponents

us-gaap:EffectOfExchangeRateOnCashAndCashEquivalents

us-gaap:EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems

us-gaap:EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss

us-gaap:EquityMethodInvestmentSummarizedFinancialInformationRevenue

us-gaap:ExplorationAbandonmentAndImpairmentExpense

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

us-gaap:GainLossOnDispositionOfAssets1
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:GainLossOnSaleOfDerivatives

us-gaap:GoodwillImpairmentLoss

us-gaap:ImpairmentOfOilAndGasProperties
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

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

us-gaap:IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions

us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities

us-gaap:IncreaseDecreaseInOtherCurrentAssetsAndLiabilitiesNet

us-gaap:IncreaseDecreaseInPensionAndPostretirementObligations

us-gaap:IncreaseDecreaseInReceivables

us-gaap:InterestPaidNet

us-gaap:OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax

us-gaap:OtherComprehensiveIncomeLossNetOfTax
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax

us-gaap:OtherExpenses

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

us-gaap:PaymentsForProceedsFromOtherInvestingActivities
us-gaap:RetirementPlanFundingStatus
us-gaap:PensionContributions

us-gaap:ProceedsFromIncomeTaxRefunds

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities

us-gaap:ProceedsFromSaleOfOilAndGasPropertyAndEquipment

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

us-gaap:ProvisionForDoubtfulAccounts

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

us-gaap:ResultsOfOperationsTransportationCosts
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
us-gaap:TitleOfIndividual, us-gaap:AwardType

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation
us-gaap:StatementEquityComponents

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

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

us-gaap:WeightedAverageNumberDilutedSharesOutstandingAdjustment

mro:ContractWithCustomerAccountsReceivableNet

mro:Deferredcreditandotherliabilities
us-gaap:FairValueByMeasurementBasis
mro:FinancialAssetsFairValueDisclosure

mro:InventorySuppliesAndSundry

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

us-gaap:AdditionalPaidInCapital

us-gaap:AllowanceForDoubtfulAccountsReceivable

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent

us-gaap:AssetRetirementObligation

us-gaap:AssetRetirementObligationCurrent

us-gaap:AssetRetirementObligationsNoncurrent

us-gaap:CapitalizedExploratoryWellCostsThatHaveBeenCapitalizedForPeriodGreaterThanOneYear

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsDisposalGroupIncludingDiscontinuedOperations

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations

us-gaap:DeferredIncomeTaxLiabilitiesNet
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:StatementScenario
us-gaap:DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear
us-gaap:StatementScenario, us-gaap:RetirementPlanType
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:DerivativeAssets
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementFrequency
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:DerivativeFairValueOfDerivativeAsset
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship
us-gaap:HedgingDesignation

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

us-gaap:DerivativeFairValueOfDerivativeLiability
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship
us-gaap:HedgingDesignation
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship
us-gaap:DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:DerivativeLiabilities
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementFrequency
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:DerivativeNonmonetaryNotionalAmount
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation, us-gaap:SubsequentEventType
us-gaap:DerivativeInstrumentRisk
us-gaap:DerivativeNotionalAmount
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship
us-gaap:DerivativeInstrumentRisk, us-gaap:LongtermDebtType, us-gaap:SubsequentEventType

us-gaap:EmployeeRelatedLiabilitiesCurrent

us-gaap:EquityMethodInvestments
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:FairValueByMeasurementBasis
us-gaap:FinancialLiabilitiesFairValueDisclosure
us-gaap:GuaranteeObligationsByNature
us-gaap:GuaranteeObligationsMaximumExposure

us-gaap:LongTermDebtAndCapitalLeaseObligations
us-gaap:FairValueByMeasurementBasis
us-gaap:LongTermDebtFairValue
us-gaap:FairValueByMeasurementBasis
us-gaap:OtherAssetsFairValueDisclosure
us-gaap:FairValueByMeasurementBasis
us-gaap:OtherLiabilitiesFairValueDisclosure

us-gaap:PostemploymentBenefitsLiabilityNoncurrent

us-gaap:PreferredStockSharesAuthorized

us-gaap:PreferredStockSharesIssued

us-gaap:PreferredStockSharesOutstanding
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue

us-gaap:TreasuryStockShares

Tables

  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-03-31
us-gaap:CommonStockValue █████████████████▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁937937937937937937937937937937937937937937937937937770770770770770770770770770770770770770770770770770770770770NA769769NANA
us-gaap:CommonStockSharesIssued █████████████████▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁937937937937937937937937937937937937937937937937937770770770770770770770770770770770770770770770770770770770770NA769769NANA
us-gaap:CommonStockSharesAuthorized ████████▂▂▂▂▂▂▂▂▂▂▂▂▁▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂1925192519251925192519251925192511001100110011001100110011001100110011001100110010001100110011001100110011001100110011001100110011001100110011001100NA11001100NANA
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding 794NA803814820NA849855852NA850850849NA847848730NA677677675NA678679696711714712709709710NA714717715NA712712711NA711NA
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic 794NA802813819NA848854851NA850850849NA847848730NA677677675NA675676693707710708706706706NA711713711NA710710709NA709NA
us-gaap:EarningsPerShareBasic ▆▆▇▇▇▇▇▇▇▆▆▆▁▅▆▆▆▅▅▆▆█▇▇█▇▇▇▇▇▇▇▇██▇▇▇▇▇▇▇-0.06-0.0300000000000000270.210.20.210.47000000000000010.30.110.42-0.03000000000000025-0.7-0.16-5.84-1.66-0.23-0.2-0.56-1.17-1.11-0.57-0.411.37000000000000060.640.81.660.80.60.540.640.560.590.78000000000000020.571.41.40.99000000000000020.981.00.640.50.580.4
us-gaap:EarningsPerShareDiluted ▆▆▇▇▇▇▇▇▇▆▆▆▁▅▆▆▆▅▅▆▆█▇▇█▇▇▇▇▇▇▇▇██▇▇▇▇▇▇▇-0.06-0.0300000000000000270.210.20.210.46000000000000010.30.110.42-0.03000000000000025-0.7-0.16-5.84-1.66-0.23-0.2-0.56-1.17-1.11-0.57-0.411.35999999999999990.640.81.650.80.60.540.630.560.590.77999999999999980.571.391.390.98999999999999980.981.00.640.50.580.4
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-03-31
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax ▁▁▁▂▁▂▂▂▂▂▁▁▁▁▁▂▁▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂██▇▂▇▆▆▄1024123312491381120013801538144715371336113610591072-2651229130273014751323153115322497297129413529391438984106416137844040380937993865210711965218575290316820160661447710279
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,mro:NorthAmericaExplorationAndProduction▃▆▆▆▅▆█▆▅▃▁97011681172120010621193134712211125969772NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService,us-gaap:StatementBusinessSegments srt:CrudeOil,mro:NorthAmericaExplorationAndProduction▁▅▆▆▂▄█▆8289901017102185992510901013NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService,us-gaap:StatementGeographical,us-gaap:StatementBusinessSegments srt:CrudeOil,mro:Bakken,mro:NorthAmericaExplorationAndProduction▁▅██▃▄█▅330409452453372386447405NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService,us-gaap:StatementGeographical,us-gaap:StatementBusinessSegments srt:CrudeOil,mro:EagleFord,mro:NorthAmericaExplorationAndProduction▁▄▃▃▂▄█▆307354336350318358436394NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:StatementBusinessSegments mro:NorthAmericaExplorationAndProduction▁▅▅▅▃▅█▆▄97011681172120010621193134712211125NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:StatementGeographical,us-gaap:StatementBusinessSegments mro:Bakken,mro:NorthAmericaExplorationAndProduction▁▆██▄▄█▆348437466474394408475430NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:StatementGeographical,us-gaap:StatementBusinessSegments mro:EagleFord,mro:NorthAmericaExplorationAndProduction▁▃▂▃▂▅█▆348410388413389454542473NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:StatementGeographical,us-gaap:StatementBusinessSegments stpr:OK,mro:NorthAmericaExplorationAndProduction▁▇▅▅▂▇█▇134194181178144194208194NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:Revenues ▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▂▂▂▂▂▂▂▂▂▂▂▂▂██▇▂▇▆▆▄123012151345143311971765166714171733138212521059107213891229130273014751323153115322497297129413529391438984106416137844040380937993865210711965218575290316820160661447710279
us-gaap:CostsAndExpenses ▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▂▂▁▁▂▂▂▂▂▂▂▂▂▂▂▂▂██▇▁▇▆▆▄121511421108117811261298124412121161117416291085101013361432145413282389239318651905264024632354234724922323262623792309264625462466293718968184121706919811582015073134609741
us-gaap:GeneralAndAdministrativeExpense ▁▁▁▁▁▁▂▂▂▂▁▁▂▁▂▂▃▂▂▃▃▃▃▂▃▃▃▃▂▂▂▃▂▂▇█▆▂▆▆▆▆769382879488101105100101979310996105132151126125168171168160139192152164174139130120173104130353405324118298328323291
 us-gaap:GeneralAndAdministrativeExpense us-gaap:ConsolidationItems us-gaap:CorporateNonSegment▁▆▂▄▇▂▇█▆▇▆4055434858435761555954NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:GeneralAndAdministrativeExpense us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,mro:NorthAmericaExplorationAndProduction▄▅▅▄▂█▇▆▇▁▂▃▅32333431293837353627293033NANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OperatingIncomeLoss ▃▄▄▄▄▄▄▄▅▄▃▃▃▃▃▃▂▁▁▃▃▃▄▅▆▆▇▇▇▇▆▆▆▅█▆▇▅▆▆▆▅157323725571467423205572208-377-266253-203-152-598-914-1070-334-373-14350858711821422157514801782147513941263133392821031240150692210009931017538
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest ▄▄▅▅▄▅▅▅▆▅▃▄▄▄▃▄▂▁▁▃▃▄▅▆▇▆▆█-49-317519327406357140524132-458-112-16-24-290-238-683-1001-1145-392-420-20145351111307558041367NANANANANANANANANANANANANANA
us-gaap:IncomeTaxExpenseBenefit ▃▃▃▃▂▃▃▃▃▃▃▃▃█▂▂▁▂▁▃▂▂▃▃▅▆▇▇█▇▆▅▆▅▆▅▆▄▅▅▅▄-3171032-147161034416816014141341347-98-68-276-208-396-6-144-1081491515907871078102512791025927669898617763506783441513708590257
 us-gaap:IncomeTaxExpenseBenefit us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,mro:InternationalExplorationAndProduction▁▂▂▂▁▃▃▂██▆▃▃0131017-114630261701701064650NANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:IncomeTaxesPaidNet ▂▃▂▁▂▂▂▂▃▄▂▂▂▂▂▂▂▂▂▃▂▃▃█▅5224-2-120-292516512312905828151674615-3911847165178883453NANA1003NA1489828710832746605729581439406265NANA
us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest ▆▆▇▆▆▇▇▆▇▆▆▆▁▅▆▆▆▅▅▆▆▇▇▇▇▇▇▇▇▇▇▇▇█▇▇▇▇▇▆▇▇-68-27227152170474274113360-36-599-145-4922-1317-189-160-422-753-752-330-227926432532112959150839039339042650742316211022577683779466-25437252
us-gaap:NetIncomeLoss ▇▇▇▇▇▇▇▇▇▇▆▇▁▅▆▆▆▆▆▆▆█▇▇█▇▇▇▇▇▇▇▇██▇▇▇▇▇▇▇-46-2016516117439025496356-28-599-139-4957-1371-192-170-407-793-749-386-2769264315401149569426383450393417549405996996706696709457355413282
 us-gaap:NetIncomeLoss us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,mro:InternationalExplorationAndProduction▁▃▄█▅-133439661NA116142132NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetIncomeLoss us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome,us-gaap:StatementEquityComponents us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome,us-gaap:AccumulatedDefinedBenefitPlansAdjustment1NA7024NA-13-5NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-03-31
us-gaap:Assets ▁▁▁▁▁▁▁▁▁▂▂▂▂▃▄▄▄▄▄▄▄▅▅▅▅▄▄▄▄▄▄▄▃▃██▇19715202452037321282214102132121778218712163422012229472424124537310943231032527328683231134674357703473636011367003593536151357763504835109345583225031851313713054130490518655001448123NA4772547052NANA
 us-gaap:Assets us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,mro:NorthAmericaExplorationAndProduction▁█1745317781NANA1750317321NANANA16863NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:Liabilities ▁▁▁▂▂▂▂▂▂▂▂▂▃▃▃▃▃▃▄▄▃▄▄▄▄▄▄▄▄▃▃▃▃▃██▇77578092810291819202919397349739960010304111721183611953135531338813374135171375815339155521407614991164741606716346167821602716521164941446514345142121378513783271602624324767NA2549825142NANA
us-gaap:LiabilitiesAndStockholdersEquity ▁▁▁▁▁▁▁▁▁▂▂▂▂▃▄▄▄▄▄▄▄▅▅▅▅▄▄▄▄▄▄▄▃▃██▇19715202452037321282214102132121778218712163422012229472424124537310943231032527328683231134674357703473636011367003593536151357763504835109345583225031851313713054130490518655001448123NA4772547052NANA
us-gaap:StockholdersEquity ▁▁▂▁▁▁▁▁▁▁▁▂▂▆███▇█11958121531227112101122081212812044121321203411708117751240512584175411892219153193511855319335NANA21020NANANANANANA18064177851749917152NANANA23771NANANANANANA
 us-gaap:StockholdersEquity us-gaap:StatementEquityComponents us-gaap:AdditionalPaidInCapital▁▄▃▃▂▄▄▄▄██71027207719771707149723872267227723773797367NANA7446NANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:StockholdersEquity us-gaap:StatementEquityComponents us-gaap:RetainedEarnings▇██▇▇▆▄▃▃▁▁78957993805379287808770673577146709367796849NANA12672NANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-03-31
us-gaap:AssetsCurrent ▁▁▁▁▁▂▂▂▂▁▂▂▂▂▂▂▂▁▂▂▂▂▂▂▂▂▂▂▂▂▂▂▄▄█▇▆1909213525202688277629213065308729022566369044243743366530423754326825903858413029684593420442184787345532813777403732543445322471547314157751382911600NA1173910637NANA
us-gaap:CashAndCashEquivalentsAtCarryingValue ▂▂▂▂▂▃▃▃▃▁▃▄▄▄▃▄▃▂▃▃▂▄▂▂▃▁▁▂▂▁▁▁▇▇█▆▃▃▄▃▂▃817858116596110191462156416671613563179526142490249019532584207212211680157211262398761116919643542467686714525134934633471157163951164320622718205713701869
us-gaap:AccountsReceivableNetCurrent ▁▂▂▂▁▁▂▂▁▁▁▁▁▁▁▁▁▁▁▂▂▂▃▃▃▃▃▃▃▃▃▂▂▂█▇▇703112211481144108610791335117611001082945767751877783822779912991119513411729204820422222256224432466255320472198191716961790649859725363NA48604677NANA
us-gaap:InventoryNet ▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▂▂▂▂▂▂▂▂▁▁▁▂▁▁▆▇█787271728396110117110126132140145227221272306313324336379357379404405360368368324335296361342343308834533969NA38483622NANA
us-gaap:OtherAssetsCurrent ▂▂▂▂▃▄▁▂▁▁▁▃▂▂▂▂▂▂▃▂▂▂▂▃▃▃▃▃▄▃▄▃▇▆▆▆█118831361011602573192663662160134718576111144163102122109143211196179224175269215233223458417414395572NA221199NANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-03-31
us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment ▃▃▂▂▂▆▇▇▆▆▆▆▅▇▆▆▇███▇▆▅▅▇▆▅▅▃▂▂▂▁▁▅▄▄18641180031736617260176692183022358223362187221564216692123820692222142177521659227632326023713233952264821884210242020722336211712063920195184381777717184172481673116243206921980519027NA1821717185NANA
us-gaap:PropertyPlantAndEquipmentNet ▁▁▁▁▁▁▁▁▁▂▁▂▁▅▅▅▆▆▆▇▇▇▆▆▆▆▆▆▆▅▅▅▃▃███16903170001671716730167141680416899168811693117665176451833716533257182597625657267372706127920291212929129040286582782428426278222745728382274462600125365253242031820140321893222231987NA3167432121NANA
 us-gaap:PropertyPlantAndEquipmentNet us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,mro:NorthAmericaExplorationAndProduction▇█▃▃▂▁▁16352164271612716112160681601116011NANA15867NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:Goodwill ▁▁▁▁▁▁▁▁▁▂▂▂▂▂▂▂▂▂▃▃▃▃▃▃▄▄▄▄▄▄▄▄▄▄███09595959797979898115115115115115115115115115457459459459457457499499499528525525525536537537137613801383NA14141422NANA
us-gaap:OtherAssetsNoncurrent ▁▁▁▁▁▂▃▃▃▂▂▂▂▂▆▆▅▅▄▃▃▂▃▃▄█▇▃▄▃▃▃▃▃▂▂▄27535237442044072391286084976460754369866522462057178915421427101591880698810881216278425671118123111511163904110110246797811309NA574578NANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-03-31
us-gaap:LiabilitiesCurrent ▁▁▂▂▁▁▂▁▁▁▁▁▂▂▁▁▁▁▂▂▂▃▃▃▃▃▃▃▅▃▃▃▃▃██▇144217452379247118581832214220441909196817622082309922401408138215261729284830523561437941763974431446734008462967824691467343944125416111782111139604NA93859057NANA
us-gaap:AccountsPayableCurrent ▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▂▂▃▂▂▂▂▂▂▂▂▂▂▂▂██▇11041307137414011310132014791428133513951313115810811078964953108413131246150718542545243024392382240621522284233521582029186415481631834180006775NA71436982NANA
us-gaap:AccruedIncomeTaxesCurrent ▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▂▂▁▁▆▆▆▇█▆██▇▇▇▆▆7211886771491811289912817716278819466851511321431562602851811931476151113971892202714402065201519041839174414471407NA679547NANA
us-gaap:OtherLiabilitiesCurrent ▂▂▂▂▂▁▅▅▄▃▂▂▂▃▃▂▂▁▃▂▃▃▂▁▂▄▃▂▂▂▂▁▂▂██▆198208227216220170405405359288188206222253256229211150286235252290184147208326254203206211207158192193593580489NA638566NANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-03-31
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-03-31
us-gaap:StockholdersEquity ▁▁▂▁▁▁▁▁▁▁▁▂▂▆███▇█11958121531227112101122081212812044121321203411708117751240512584175411892219153193511855319335NANA21020NANANANANANA18064177851749917152NANANA23771NANANANANANA
 us-gaap:StockholdersEquity us-gaap:StatementEquityComponents us-gaap:AdditionalPaidInCapital▁▄▃▃▂▄▄▄▄██71027207719771707149723872267227723773797367NANA7446NANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:StockholdersEquity us-gaap:StatementEquityComponents us-gaap:RetainedEarnings▇██▇▇▆▄▃▃▁▁78957993805379287808770673577146709367796849NANA12672NANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:CommonStockValue █████████████████▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁937937937937937937937937937937937937937937937937937770770770770770770770770770770770770770770770770770770770770NA769769NANA
us-gaap:RetainedEarningsAccumulatedDeficit ▂▂▂▂▂▁▁▁▁▁▁▁▁▄▅▅▅▅▆▆▆▆▆▆▆▅▅▅▄▄▄▄▄▄██▇7895799380537928780877067357714670936779684974917673126721408614320145331497415800166911722017638168541656416151148921445814153136881335813084127881235212053207251990719379NA1832818043NANA
us-gaap:TreasuryStockValue ████▇▇▅▄▄▅▅▅▅▅▅▅▅▆▆▆▆▆▆▆▅▃▁▁▂▂▂▂▂▁▁▂▂4059408940283984374538163455313731753325332433183314343134063397339735543553355536343642364437183445294924772527260726462652271627212493258226652681NA26962706NANA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax ██████▇▇▇▇▇▇▇▇▆▆▆▆▆▆▆▆▆▆▆▅▅▅▅▅▅▅▅▅▁▁▂83105112505963-21-41-58-62-54-54-48-83-137-140-150-135-175-172-228-277-277-278-270-322-344-426-421-364-361-370-328-346-971-997-868NA-925-934NANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities █▁701700NANA515855NANANANANANANANANANANA3524964083091155177410881470NANA1528NA7699731034108018182592288586112788491960NA839
us-gaap:NetCashProvidedByUsedInInvestingActivities █▁-611-894NANA-564-549NANANANANANANANANANANA258-247-1771-14422-1544-12521048NANA-1037NA-1195-806-5056-738-1040-833-365-1114-1132-10-1072NA-1558
us-gaap:NetCashProvidedByUsedInFinancingActivities ▃▃▃▃▃▃▃▄▃▁▁▃▃▄▃▃▇▁▃█▃▃▃▂▂-131-113-72-278-72-404-377-29-49-1043-864-46-50-37-44-431198-1068-1391807-138-173-77-533-810NANA-413NA367-157-113-403-17812-212-176-798-172-202NA1307
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities █▁701700NANA515855NANANANANANANANANANANA3524964083091155177410881470NANA1528NA7699731034108018182592288586112788491960NA839
us-gaap:NetIncomeLoss ▇▇▇▇▇▇▇▇▇▇▆▇▁▅▆▆▆▆▆▆▆█▇▇█▇▇▇▇▇▇▇▇██▇▇▇▇▇▇▇-46-2016516117439025496356-28-599-139-4957-1371-192-170-407-793-749-386-2769264315401149569426383450393417549405996996706696709457355413282
 us-gaap:NetIncomeLoss us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,mro:InternationalExplorationAndProduction▁▃▄█▅-133439661NA116142132NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetIncomeLoss us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome,us-gaap:StatementEquityComponents us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome,us-gaap:AccumulatedDefinedBenefitPlansAdjustment1NA7024NA-13-5NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:DepreciationDepletionAndAmortization ▄▄▄▄▃▄▄▄▄▃▄▄▃▄▄▃▄▅▅▆▇▇▆▅▅▅▆▆▄▃▃▃▂▃▇█▆▁▄▄▄▅644616622605554613626612590583641592556631594561609668717751821801737680697720738747625580574550517564852893765416649653627660
 us-gaap:DepreciationDepletionAndAmortization us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,mro:NorthAmericaExplorationAndProduction█▇▇▅▃▅▆▅▄▃▄▂▁617586589561514562571556528513531495472NANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet ▄▄▄▄█▄▇▁▆▆▅▄▂▆▄▄▂▄▆▄▄▅▂▄▄181072815438105-7890894123-36843316-5714101191667-313128NANA-135NA-1824-509-30-92-643-4-67-83NA-29
us-gaap:IncreaseDecreaseInInventories ▅▅▅▅▅▄▄▅▆▄▄▄▆▅▁▃▄▄▄▂▇▃▃▆█61-11-4-10-689-6-9-5106-51-23-7-6-9-4322-21-261741NANA15NA25-714-1320-366-494624-194235-58NA-18
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-03-31
us-gaap:NetCashProvidedByUsedInInvestingActivities █▁-611-894NANA-564-549NANANANANANANANANANANA258-247-1771-14422-1544-12521048NANA-1037NA-1195-806-5056-738-1040-833-365-1114-1132-10-1072NA-1558
us-gaap:PaymentsToAcquirePropertyPlantAndEquipment ▃▃▃▃▃▃▄▃▃▃▃▂▁▁▁▁▂▃▃▄██▇▆▅62061667264761568476963866266953049228326223029945452862886814521521140911791051NANA1375NA1164101785873564010621128177451213481482NA1586
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-03-31
us-gaap:NetCashProvidedByUsedInFinancingActivities ▃▃▃▃▃▃▃▄▃▁▁▃▃▄▃▃▇▁▃█▃▃▃▂▂-131-113-72-278-72-404-377-29-49-1043-864-46-50-37-44-431198-1068-1391807-138-173-77-533-810NANA-413NA367-157-113-403-17812-212-176-798-172-202NA1307
us-gaap:PaymentsOfDividends ▁▁▁▂▂▂▂▂▂▂▂▂▂▂▂▂▁▁█████▇▇404040414141434342424343424342433433142143142142141127133NANA120NA119121105106178178178176178172169NA170
us-gaap:PaymentsOfDividends ▁▁▁▂▂▂▂▂▂▂▂▂▂▂▂▂▁▁█████▇▇404040414141434342424343424342433433142143142142141127133NANA120NA119121105106178178178176178172169NA170
us-gaap:PaymentsForRepurchaseOfCommonStock ▂▂▁▄▁▆▅▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▇█▇▁▁92663023630364338291037-514000000044955150000NANANANANANANANANANANANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-03-31

Common Stock Value

us-gaap:CommonStockValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-312009-12-312008-12-31
Value937937937937937937937937937937937937937937937937937770770770770770770770770770770770770770770770770770770770770770770769769767
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets4.84.64.64.44.44.44.34.34.34.34.13.93.83.02.92.92.92.42.22.22.22.12.12.12.12.22.22.22.22.22.22.42.42.52.52.51.51.51.61.61.61.8

Common Stock Par Or Stated Value Per Share

Shares Issued

Common Stock Shares Issued

us-gaap:CommonStockSharesIssued



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-312009-12-312008-12-31
Value937937937937937937937937937937937937937937937937937770770770770770770770770770770770770770770770770770770770770770770769769767
Percentage of CommonStockSharesIssued100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Common Stock Shares Outstanding

Common Stock Shares Authorized

us-gaap:CommonStockSharesAuthorized



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-312009-12-312008-12-31
Value192519251925192519251925192519251100110011001100110011001100110011001100110011001000110011001100110011001100110011001100110011001100110011001100110011001100110011001100
Percentage of CommonStockSharesAuthorized100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-312009-09-30
Value794803814820849855852850850849847848730677677675678679696711714712709709710714717715712712711711
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-312009-09-30
Value794802813819848854851850850849847848730677677675675676693707710708706706706711713711710710709709
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-03-31
Value-0.06-0.0300000000000000270.210.20.210.47000000000000010.30.110.42-0.03000000000000025-0.7-0.16-5.84-1.66-0.23-0.2-0.56-1.17-1.11-0.57-0.411.37000000000000060.640.81.660.80.60.540.640.560.590.78000000000000020.571.41.40.99000000000000020.981.00.640.50.580.4
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-03-31
Value-0.06-0.0300000000000000270.210.20.210.46000000000000010.30.110.42-0.03000000000000025-0.7-0.16-5.84-1.66-0.23-0.2-0.56-1.17-1.11-0.57-0.411.35999999999999990.640.81.650.80.60.540.630.560.590.77999999999999980.571.391.390.98999999999999980.981.00.640.50.580.4
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Income Loss From Continuing Operations Per Basic Share

Income Loss From Continuing Operations Per Diluted Share

Revenue From Contract With Customer Excluding Assessed Tax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-03-31
Value1024123312491381120013801538144715371336113610591072-2651229130273014751323153115322497297129413529391438984106416137844040380937993865210711965218575290316820160661447710279
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, mro:InternationalExplorationAndProduction



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value546577181138187191226412367364
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.35.36.213.111.513.612.415.626.827.532.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.35.36.213.111.513.612.415.626.827.532.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments mro:InternationalExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, mro:NorthAmericaExplorationAndProduction



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value97011681172120010621193134712211125969772
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax94.794.793.886.988.586.487.684.473.272.568.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax94.794.793.886.988.586.487.684.473.272.568.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments mro:NorthAmericaExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductOrService, us-gaap:StatementBusinessSegments

mro:Miscellaneousother, mro:NorthAmericaExplorationAndProduction



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value241010162316375
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.30.80.81.21.91.20.20.50.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.30.80.81.21.91.20.20.50.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax mro:Miscellaneousother mro:NorthAmericaExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0100.0

srt:CrudeOil, mro:NorthAmericaExplorationAndProduction



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value8289901017102185992510901013
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax80.980.381.473.971.667.070.970.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax80.980.381.473.971.667.070.970.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:CrudeOil mro:NorthAmericaExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0

srt:NaturalGasLiquidsReserves, mro:NorthAmericaExplorationAndProduction



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value5282648477125152115
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.16.75.16.16.49.19.97.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.16.75.16.16.49.19.97.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:NaturalGasLiquidsReserves mro:NorthAmericaExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0

srt:NaturalGasReserves, mro:NorthAmericaExplorationAndProduction



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value6686817910312710286
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.47.06.55.78.69.26.65.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.47.06.55.78.69.26.65.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:NaturalGasReserves mro:NorthAmericaExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0

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

mro:Miscellaneousother, mro:EagleFord, mro:NorthAmericaExplorationAndProduction



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value23112501
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.20.20.10.10.20.40.00.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.20.20.10.10.20.40.00.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax mro:Miscellaneousother mro:EagleFord mro:NorthAmericaExplorationAndProduction100.0100.0100.0100.0100.0100.00.0100.0

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



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value227915211136
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.10.60.71.11.80.80.20.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.10.60.71.11.80.80.20.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax mro:Miscellaneousother mro:OtherU.S. mro:NorthAmericaExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0

srt:CrudeOil, country:GQ, mro:InternationalExplorationAndProduction



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value4556671014771100100
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.44.55.47.33.95.16.56.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.44.55.47.33.95.16.56.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:CrudeOil country:GQ mro:InternationalExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0

srt:CrudeOil, mro:Bakken, mro:NorthAmericaExplorationAndProduction



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value330409452453372386447405
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax32.233.236.232.831.028.029.128.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax32.233.236.232.831.028.029.128.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:CrudeOil mro:Bakken mro:NorthAmericaExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0

srt:CrudeOil, mro:EagleFord, mro:NorthAmericaExplorationAndProduction



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value307354336350318358436394
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax30.028.726.925.326.525.928.327.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax30.028.726.925.326.525.928.327.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:CrudeOil mro:EagleFord mro:NorthAmericaExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0

srt:CrudeOil, mro:NorthernDelaware, mro:NorthAmericaExplorationAndProduction



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value7487887764625959
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.27.17.05.65.34.53.84.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.27.17.05.65.34.53.84.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:CrudeOil mro:NorthernDelaware mro:NorthAmericaExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0

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



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value3319253028333444
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.21.52.02.22.32.42.23.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.21.52.02.22.32.42.23.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:CrudeOil mro:OtherU.S. mro:NorthAmericaExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0

srt:CrudeOil, stpr:OK, mro:NorthAmericaExplorationAndProduction



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value841211161117786114111
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.29.89.38.06.46.27.47.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.29.89.38.06.46.27.47.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:CrudeOil stpr:OK mro:NorthAmericaExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0

srt:NaturalGasLiquidsReserves, mro:Bakken, mro:NorthAmericaExplorationAndProduction



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value101561510111917
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.01.20.51.10.80.81.21.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.01.20.51.10.80.81.21.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:NaturalGasLiquidsReserves mro:Bakken mro:NorthAmericaExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0

srt:NaturalGasLiquidsReserves, mro:EagleFord, mro:NorthAmericaExplorationAndProduction



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value1626233035487045
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.62.11.82.22.93.54.63.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.62.11.82.22.93.54.63.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:NaturalGasLiquidsReserves mro:EagleFord mro:NorthAmericaExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0

srt:NaturalGasLiquidsReserves, mro:NorthernDelaware, mro:NorthAmericaExplorationAndProduction



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value3657814126
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.30.50.40.50.71.00.80.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.30.50.40.50.71.00.80.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:NaturalGasLiquidsReserves mro:NorthernDelaware mro:NorthAmericaExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0

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



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value20212132
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.20.00.20.10.20.10.20.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.20.00.20.10.20.10.20.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:NaturalGasLiquidsReserves mro:OtherU.S. mro:NorthAmericaExplorationAndProduction100.00.0100.0100.0100.0100.0100.0100.0

srt:NaturalGasLiquidsReserves, stpr:OK, mro:NorthAmericaExplorationAndProduction



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value2135283122514845
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.12.82.22.21.83.73.13.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.12.82.22.21.83.73.13.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:NaturalGasLiquidsReserves stpr:OK mro:NorthAmericaExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0

srt:NaturalGasReserves, country:GQ, mro:InternationalExplorationAndProduction



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value888979910
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.80.60.60.70.60.70.60.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.80.60.60.70.60.70.60.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:NaturalGasReserves country:GQ mro:InternationalExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0

srt:NaturalGasReserves, mro:Bakken, mro:NorthAmericaExplorationAndProduction



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value81386121198
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.81.10.60.41.00.80.60.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.81.10.60.41.00.80.60.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:NaturalGasReserves mro:Bakken mro:NorthAmericaExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0

srt:NaturalGasReserves, mro:EagleFord, mro:NorthAmericaExplorationAndProduction



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value2327283234433633
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.22.22.22.32.83.12.32.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.22.22.22.32.83.12.32.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:NaturalGasReserves mro:EagleFord mro:NorthAmericaExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0

srt:NaturalGasReserves, mro:NorthernDelaware, mro:NorthAmericaExplorationAndProduction



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value36316762
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.30.50.20.10.50.50.40.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.30.50.20.10.50.50.40.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:NaturalGasReserves mro:NorthernDelaware mro:NorthAmericaExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0

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



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value32546955
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.30.20.40.30.50.70.30.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.30.20.40.30.50.70.30.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:NaturalGasReserves mro:OtherU.S. mro:NorthAmericaExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0

srt:NaturalGasReserves, stpr:OK, mro:NorthAmericaExplorationAndProduction



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value2938373645574638
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.83.13.02.63.84.13.02.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.83.13.02.63.84.13.02.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:NaturalGasReserves stpr:OK mro:NorthAmericaExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

mro:NorthAmericaExplorationAndProduction



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value97011681172120010621193134712211125
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax94.794.793.886.988.586.487.684.473.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax94.794.793.886.988.586.487.684.473.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax mro:NorthAmericaExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementGeographical, us-gaap:StatementBusinessSegments

country:GQ, mro:InternationalExplorationAndProduction



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value5464771115582110111
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.35.26.28.04.65.97.27.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.35.26.28.04.65.97.27.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax country:GQ mro:InternationalExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0

mro:Bakken, mro:NorthAmericaExplorationAndProduction



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value348437466474394408475430
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax34.035.437.334.332.829.630.929.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax34.035.437.334.332.829.630.929.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax mro:Bakken mro:NorthAmericaExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0

mro:EagleFord, mro:NorthAmericaExplorationAndProduction



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value348410388413389454542473
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax34.033.331.129.932.432.935.232.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax34.033.331.129.932.432.935.232.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax mro:EagleFord mro:NorthAmericaExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0

mro:NorthernDelaware, mro:NorthAmericaExplorationAndProduction



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value8099968578837767
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.88.07.76.26.56.05.04.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.88.07.76.26.56.05.04.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax mro:NorthernDelaware mro:NorthAmericaExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0

mro:OtherU.S., mro:NorthAmericaExplorationAndProduction



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value6028415057544557
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.92.33.33.64.83.92.93.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.92.33.33.64.83.92.93.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax mro:OtherU.S. mro:NorthAmericaExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0

stpr:OK, mro:NorthAmericaExplorationAndProduction



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value134194181178144194208194
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax13.115.714.512.912.014.113.513.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax13.115.714.512.912.014.113.513.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax stpr:OK mro:NorthAmericaExplorationAndProduction100.0100.0100.0100.0100.0100.0100.0100.0

Revenues

us-gaap:Revenues



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-03-31
Value123012151345143311971765166714171733138212521059107213891229130273014751323153115322497297129413529391438984106416137844040380937993865210711965218575290316820160661447710279
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax120.198.5107.7103.899.8127.9108.497.9112.8103.4110.2100.0100.0-524.2100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Sales Revenue Net

Cost Of Revenue

Cost Of Goods And Services Sold

Costs And Expenses

us-gaap:CostsAndExpenses



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-03-31
Value121511421108117811261298124412121161117416291085101013361432145413282389239318651905264024632354234724922323262623792309264625462466293718968184121706919811582015073134609741
Percentage of CostsAndExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax118.792.688.785.393.894.180.983.875.587.9143.4102.594.2-504.2116.5111.7181.9162.0180.9121.8124.3105.782.980.066.563.759.664.057.261.065.566.864.976.090.093.791.968.294.193.893.094.8

General And Administrative Expense

us-gaap:GeneralAndAdministrativeExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-03-31
Value769382879488101105100101979310996105132151126125168171168160139192152164174139130120173104130353405324118298328323291
Percentage of GeneralAndAdministrativeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.47.56.66.37.86.46.67.36.57.68.58.810.2-36.28.510.120.78.59.411.011.26.75.44.75.43.94.24.23.33.43.04.52.73.41.72.11.74.11.82.02.22.8

us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value4055434858435761555954
Percentage of GeneralAndAdministrativeExpense52.659.152.455.261.748.956.458.155.058.455.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.94.53.43.54.83.13.74.23.64.44.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:CorporateNonSegment0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, mro:InternationalExplorationAndProduction



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value45587779911696
Percentage of GeneralAndAdministrativeExpense5.35.46.19.27.48.06.98.69.010.96.29.75.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.40.40.40.60.60.50.50.60.60.80.50.80.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments mro:InternationalExplorationAndProduction7.47.76.54.45.13.73.74.02.23.01.60.00.0

us-gaap:OperatingSegments, mro:NorthAmericaExplorationAndProduction



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value32333431293837353627293033
Percentage of GeneralAndAdministrativeExpense42.135.541.535.630.943.236.633.336.026.729.932.330.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.12.72.72.22.42.82.42.42.32.02.62.83.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments mro:NorthAmericaExplorationAndProduction3.32.82.92.62.73.22.72.93.22.83.80.00.0

Operating Income Loss

us-gaap:OperatingIncomeLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-03-31
Value157323725571467423205572208-377-266253-203-152-598-914-1070-334-373-14350858711821422157514801782147513941263133392821031240150692210009931017538
Percentage of OperatingIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.55.919.018.55.933.827.514.237.215.6-33.2-2.55.8-20.0-16.5-11.7-81.9-62.0-80.9-21.8-24.3-5.717.120.033.536.340.436.042.839.034.533.235.124.010.06.38.131.85.96.27.05.2

Interest Expense Debt

Other Nonoperating Income Expense

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

Income Loss From Continuing Operations

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

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-49-317519327406357140524132-458-112-16-24-290-238-683-1001-1145-392-420-201453511113027637558041367
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-4.8-0.214.014.02.229.423.29.734.19.9-40.3-10.6-1.59.1-23.6-18.3-93.6-67.9-86.5-25.6-27.4-8.015.217.432.00.019.320.633.3

Income Loss From Continuing Operations Before Income Taxes Domestic

Income Loss From Continuing Operations Before Income Taxes Foreign

Nonoperating Income Expense

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-03-31
Value-3171032-147161034416816014141341347-98-68-276-208-396-6-144-1081491515907871078102512791025927669898617763506783441513708590257
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.31.40.82.3-12.21.26.73.010.912.012.43.93.2-508.3-8.0-5.2-37.8-14.1-29.9-0.4-9.4-4.35.05.116.720.127.725.030.727.122.917.623.616.03.62.64.215.23.04.44.12.5

us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value-2-1012-134-47118-5-1135
Percentage of IncomeTaxExpenseBenefit66.7-5.90.037.591.2-25.068.940.9-3.0-6.924.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.2-0.10.00.9-11.2-0.34.61.2-0.3-0.83.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:CorporateNonSegment0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, mro:InternationalExplorationAndProduction



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value0131017-114630261701701064650
Percentage of IncomeTaxExpenseBenefit-0.076.5100.053.17.5287.529.159.1101.2106.275.2112.2147.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.01.10.81.2-0.93.32.01.811.112.79.34.34.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments mro:InternationalExplorationAndProduction0.020.013.09.4-8.024.615.711.541.346.329.10.00.0

us-gaap:OperatingSegments, mro:NorthAmericaExplorationAndProduction



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-1503-2-262031000
Percentage of IncomeTaxExpenseBenefit33.329.40.09.41.4-162.51.90.01.80.60.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.10.40.00.2-0.2-1.90.10.00.20.10.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments mro:NorthAmericaExplorationAndProduction-0.10.40.00.2-0.2-2.20.10.00.30.10.00.00.0

Income Taxes Paid Net

us-gaap:IncomeTaxesPaidNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-31
Value5224-2-120-292516512312905828151674615-391184716517888345310031489828710832746605729581439406265
Percentage of IncomeTaxesPaidNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.518.2-0.2-8.7-2.41.81.03.515.021.75.12.61.4-6.00.63.52.1-0.20.77.73.16.66.030.012.824.439.320.518.621.919.32.93.73.115.12.41.6

Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-03-31
Value-68-27227152170474274113360-36-599-145-4922-1317-189-160-422-753-752-330-227926432532112959150839039339042650742316211022577683779466-25437252
Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-6.6-2.218.211.014.234.317.87.823.4-2.7-52.7-13.7-459.1497.0-15.4-12.3-57.8-51.1-56.8-21.6-14.837.114.518.132.015.113.09.59.410.310.513.311.141.94.92.93.726.82.8-0.23.02.5

Net Income Loss

us-gaap:NetIncomeLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-03-31
Value-46-2016516117439025496356-28-599-139-4957-1371-192-170-407-793-749-386-2769264315401149569426383450393417549405996996706696709457355413282
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-4.5-1.613.211.714.528.316.56.623.2-2.1-52.7-13.1-462.4517.4-15.6-13.1-55.8-53.8-56.6-25.2-18.037.114.518.432.614.510.99.310.810.410.314.410.725.84.73.63.724.42.72.22.92.7

us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-25-201-58-150-19-63-16999
Percentage of NetIncomeLoss54.31005.0-35.2-93.2-10.9-24.8-176.027.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-2.4-16.3-4.6-10.9-1.6-4.1-11.76.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:CorporateNonSegment0.00.00.00.00.00.00.00.0

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, mro:InternationalExplorationAndProduction



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-133439661116142132
Percentage of NetIncomeLoss2.2-165.026.159.635.145.7147.937.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.12.73.47.05.17.59.88.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments mro:InternationalExplorationAndProduction-1.950.855.853.044.260.762.832.0

us-gaap:OperatingSegments, mro:NorthAmericaExplorationAndProduction



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-20148180215132201123125
Percentage of NetIncomeLoss43.5-740.0109.1133.575.979.1128.135.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-2.012.014.415.611.013.18.58.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments mro:NorthAmericaExplorationAndProduction-2.112.715.417.912.414.910.111.1

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedDefinedBenefitPlansAdjustment



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value17024-13-5
Percentage of NetIncomeLoss-2.242.41.22.3-5.1-5.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.15.60.10.3-0.8-0.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.0

us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings



Period End2020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312011-12-312011-09-30
Value-4616516117439025496356-28549405
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-4.513.211.714.528.316.56.623.2-2.114.410.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.0

Assets

us-gaap:Assets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-312009-12-312008-12-31
Value197152024520373212822141021321217782187121634220122294724241245373109432310325273286832311346743577034736360113670035935361513562035776350483510935306345583225031851313713054130490518655001448123477254705242686
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment



Period End2020-03-312019-12-312019-03-312018-12-312017-12-31
Value85793412391917948
Percentage of Assets4.34.65.89.04.3
Percentage of Assets4.34.65.89.04.3
Percentage of Assets us-gaap:CorporateNonSegment100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, mro:InternationalExplorationAndProduction



Period End2020-03-312019-12-312019-03-312018-12-312017-12-31
Value14051530266820834201
Percentage of Assets7.17.612.59.819.1
Percentage of Assets7.17.612.59.819.1
Percentage of Assets us-gaap:OperatingSegments mro:InternationalExplorationAndProduction100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, mro:NorthAmericaExplorationAndProduction



Period End2020-03-312019-12-312019-03-312018-12-312017-12-31
Value1745317781175031732116863
Percentage of Assets88.587.881.881.276.6
Percentage of Assets88.587.881.881.276.6
Percentage of Assets us-gaap:OperatingSegments mro:NorthAmericaExplorationAndProduction100.0100.0100.0100.0100.0

Liabilities

us-gaap:Liabilities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-312009-12-312008-12-31
Value775780928102918192029193973497399600103041117211836119531355313388133741351713758153391555214076149911647416067163461627616782160271652117023164941446514345142121378513783271602624324767254982514221277
Percentage of Liabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets39.340.039.843.143.043.144.744.544.446.848.748.848.743.641.441.141.142.644.243.540.541.644.944.745.245.746.945.747.148.247.744.945.045.345.145.252.452.551.553.453.449.8

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-312009-12-312008-12-31
Value197152024520373212822141021321217782187121634220122294724241245373109432310325273286832311346743577034736360113670035935361513562035776350483510935306345583225031851313713054130490518655001448123477254705242686
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Stockholders Equity

us-gaap:StockholdersEquity



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-31
Value1195812153122711210112208121281204412132120341170811775124051258417541189221915319351185531933521020182831806417785174991715223771
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets60.760.060.256.957.056.955.355.555.653.251.351.251.356.458.658.958.957.455.858.451.852.355.154.954.747.5

us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-31
Value83105112505963-21-41-58-62-54-83
Percentage of StockholdersEquity0.70.90.90.40.50.5-0.2-0.3-0.5-0.5-0.5-0.5
Percentage of Assets0.40.50.50.20.30.3-0.1-0.2-0.3-0.3-0.2-0.3
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-31
Value710272077197717071497238722672277237737973677446
Percentage of StockholdersEquity59.459.358.759.358.659.760.059.660.163.062.642.4
Percentage of Assets36.035.635.333.733.433.933.233.033.533.532.123.9
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-31
Value7895799380537928780877067357714670936779684912672
Percentage of StockholdersEquity66.065.865.665.564.063.561.158.958.957.958.272.2
Percentage of Assets40.039.539.537.336.536.133.832.732.830.829.840.8
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TreasuryStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-31
Value-4059-4089-4028-3984-3745-3816-3455-3137-3175-3325-3324-3431
Percentage of StockholdersEquity-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-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:TreasuryStock0.00.00.00.00.00.00.00.00.00.00.00.0

Assets Current

us-gaap:AssetsCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-312009-12-312008-12-31
Value19092135252026882776292130653087290225663690442437433665304237543268259038584130296845934204421847872975345532813777376240373254344532247154731415775138291160011739106378403
Percentage of AssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets9.710.512.412.613.013.714.114.113.411.716.118.315.311.89.411.59.98.011.111.58.512.811.511.713.28.49.79.410.810.711.710.110.810.323.424.030.427.724.124.622.619.7

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-03-312008-12-312007-12-312006-12-31
Value817858116596110191462156416671613563179526142490249019532584207212211680157211262398761116919642643542467686846714525134934633471157163951164320622718205713701869128511992585
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets4.14.25.74.54.86.97.27.67.52.67.810.810.18.06.07.96.33.84.84.43.26.72.13.35.40.71.00.72.21.91.91.41.61.615.215.511.07.93.40.05.74.40.00.03.00.00.0

Short Term Investments

Accounts Receivable Net Current

us-gaap:AccountsReceivableNetCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-312009-12-312008-12-31
Value70311221148114410861079133511761100108294576775187778382277991299111951341172920482042222221342562244324662389255320472198191716961790649859725363486046773094
Percentage of AccountsReceivableNetCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets3.65.55.65.45.15.16.15.45.14.94.13.23.12.82.42.52.42.82.93.33.94.85.65.76.16.07.27.07.06.87.46.36.96.15.65.912.511.911.110.29.97.2

Inventory Net

us-gaap:InventoryNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-312009-12-312008-12-31
Value787271728396110117110126132140145227221272306313324336379357379404405364360368368361324335296361342343308834533969384836223507
Percentage of InventoryNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.40.40.30.30.40.50.50.50.50.60.60.60.60.70.70.80.91.00.90.91.11.01.01.11.11.01.01.01.01.00.91.00.91.21.11.16.06.98.28.17.78.2

Other Assets Current

us-gaap:OtherAssetsCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-312009-12-312008-12-31
Value118831361011602573192663662160134718576111144163102122109143211196213179224175301269215233223458417414395572221199461
Percentage of OtherAssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.60.40.70.50.71.20.10.40.30.20.30.70.50.20.30.20.30.40.50.30.40.30.40.60.50.60.50.60.50.90.80.70.70.71.51.40.80.81.20.50.41.1

Noncurrent Assets

Property Plant And Equipment Gross

Accumulated Depreciation Depletion And Amortization Property Plant And Equipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-312009-12-312008-12-31
Value186411800317366172601766921830223582233621872215642166921238206922221421775216592276323260237132339522648218842102420207223362189521171206392019519266184381777717184172481673116243206921980519027182171718515581
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets94.688.985.281.182.5102.4102.7102.1101.198.094.487.684.371.467.466.669.372.068.465.465.260.857.356.261.861.559.258.957.554.653.455.154.055.054.853.339.939.639.538.236.536.5

Property Plant And Equipment Net

us-gaap:PropertyPlantAndEquipmentNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-312009-12-312008-12-31
Value169031700016717167301671416804168991688116931176651764518337165332571825976256572673727061279202912129291290402865827824284262814527822274572838228272274462600125365253242031820140321893222231987316743212129414
Percentage of PropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets85.784.082.178.678.178.877.677.278.380.376.975.667.482.780.478.981.383.880.581.484.380.678.177.478.679.077.878.380.880.179.480.679.680.766.566.162.164.466.566.468.368.9

us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value8080787880838388
Percentage of PropertyPlantAndEquipmentNet0.50.50.50.50.50.50.50.5
Percentage of Assets0.40.40.40.40.40.40.40.4
Percentage of Assets us-gaap:CorporateNonSegment9.38.60.00.06.54.30.09.3

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, mro:InternationalExplorationAndProduction



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value4714935125405667108051710
Percentage of PropertyPlantAndEquipmentNet2.82.93.13.23.44.24.89.7
Percentage of Assets2.42.42.52.52.63.33.77.8
Percentage of Assets us-gaap:OperatingSegments mro:InternationalExplorationAndProduction33.532.20.00.021.234.10.040.7

us-gaap:OperatingSegments, mro:NorthAmericaExplorationAndProduction



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value1635216427161271611216068160111601115867
Percentage of PropertyPlantAndEquipmentNet96.796.696.596.396.195.394.789.8
Percentage of Assets82.981.179.275.775.075.173.572.1
Percentage of Assets us-gaap:OperatingSegments mro:NorthAmericaExplorationAndProduction93.792.40.00.091.892.40.094.1

Goodwill

us-gaap:Goodwill



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-312009-12-312008-12-31
Value09595959797979898115115115115115115115115115457459459459457457499499499499528525525525525536537537137613801383141414221447
Percentage of Goodwill0.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.50.50.40.50.50.40.40.50.50.50.50.50.40.40.40.30.41.31.31.31.31.21.31.41.41.41.41.51.51.51.61.61.71.81.82.72.82.93.03.03.4

Intangible Assets Net Excluding Goodwill

Deferred Tax Assets Liabilities Net

Other Assets Noncurrent

us-gaap:OtherAssetsNoncurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-312009-12-312008-12-31
Value2753523744204407239128608497646075436986652246205717891542142710159188069881088121628002784256711181468123111511163904110110246797811309574578873
Percentage of OtherAssetsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.41.71.82.02.13.44.23.93.93.52.62.22.82.17.06.35.44.84.12.82.62.22.73.03.47.97.87.33.24.23.63.63.72.93.63.41.31.62.71.21.22.0

Liabilities Current

us-gaap:LiabilitiesCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-312009-12-312008-12-31
Value14421745237924711858183221422044190919681762208230992240140813821526172928483052356143794176397443144333467340084629508167824691467343944125416111782111139604938590577753
Percentage of LiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets7.38.611.711.68.78.69.89.38.88.97.78.612.67.24.44.24.65.48.28.510.312.211.411.111.912.213.111.413.214.419.614.514.714.013.513.622.722.220.019.719.218.2

Debt Current

Accounts Payable Current

us-gaap:AccountsPayableCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-312009-12-312008-12-31
Value1104130713741401131013201479142813351395131311581081107896495310841313124615071854254524302439238222062406215222842285233521582029186415481631834180006775714369824712
Percentage of AccountsPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets5.66.56.76.66.16.26.86.56.26.35.74.84.43.53.02.93.34.13.64.25.37.16.66.86.66.26.76.16.56.56.86.76.45.95.15.316.116.014.115.014.811.0

Accrued Income Taxes Current

us-gaap:AccruedIncomeTaxesCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-312009-12-312008-12-31
Value7211886771491811289912817716278819466851511321431562602851811931476144515111397189219872027144020652015190418391744144714076795471133
Percentage of AccruedIncomeTaxesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.40.60.40.40.70.80.60.50.60.80.70.30.30.30.20.30.50.40.40.40.70.80.50.54.14.14.24.05.45.65.94.56.56.46.26.03.42.92.91.41.22.7

Other Liabilities Current

us-gaap:OtherLiabilitiesCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-312009-12-312008-12-31
Value198208227216220170405405359288188206222253256229211150286235252290184147208239326254203188206211207158192193593580489638566828
Percentage of OtherLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.01.01.11.01.00.81.91.91.71.30.80.80.90.80.80.70.60.50.80.70.70.80.50.40.60.70.90.70.60.50.60.70.60.50.60.61.11.21.01.31.21.9

Deferred Tax Liabilities Noncurrent

Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent

Minority Interest

Other Liabilities Noncurrent

Stockholders Equity

us-gaap:StockholdersEquity



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-31
Value1195812153122711210112208121281204412132120341170811775124051258417541189221915319351185531933521020182831806417785174991715223771
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets60.760.060.256.957.056.955.355.555.653.251.351.251.356.458.658.958.957.455.858.451.852.355.154.954.747.5

us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-31
Value83105112505963-21-41-58-62-54-83
Percentage of StockholdersEquity0.70.90.90.40.50.5-0.2-0.3-0.5-0.5-0.5-0.5
Percentage of Assets0.40.50.50.20.30.3-0.1-0.2-0.3-0.3-0.2-0.3
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-31
Value710272077197717071497238722672277237737973677446
Percentage of StockholdersEquity59.459.358.759.358.659.760.059.660.163.062.642.4
Percentage of Assets36.035.635.333.733.433.933.233.033.533.532.123.9
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-31
Value7895799380537928780877067357714670936779684912672
Percentage of StockholdersEquity66.065.865.665.564.063.561.158.958.957.958.272.2
Percentage of Assets40.039.539.537.336.536.133.832.732.830.829.840.8
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TreasuryStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-31
Value-4059-4089-4028-3984-3745-3816-3455-3137-3175-3325-3324-3431
Percentage of StockholdersEquity-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-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:TreasuryStock0.00.00.00.00.00.00.00.00.00.00.00.0

Common Stock Value

us-gaap:CommonStockValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-312009-12-312008-12-31
Value937937937937937937937937937937937937937937937937937770770770770770770770770770770770770770770770770770770770770770770769769767
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets4.84.64.64.44.44.44.34.34.34.34.13.93.83.02.92.92.92.42.22.22.22.12.12.12.12.22.22.22.22.22.22.42.42.52.52.51.51.51.61.61.61.8

Retained Earnings Accumulated Deficit

us-gaap:RetainedEarningsAccumulatedDeficit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-312009-12-312008-12-31
Value78957993805379287808770673577146709367796849749176731267214086143201453314974158001669117220176381685416564161511513514892144581415313890136881335813084127881235212053207251990719379183281804317259
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets40.039.539.537.336.536.133.832.732.830.829.830.931.340.843.644.044.246.345.646.749.649.045.946.144.742.541.641.340.339.339.641.441.140.840.439.540.039.840.338.438.340.4

Treasury Stock Value

us-gaap:TreasuryStockValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-312009-12-312008-12-31
Value405940894028398437453816345531373175332533243318331434313406339733973554355335553634364236443718344529032949247725272560260726462652271627212493258226652681269627062720
Percentage of TreasuryStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets20.620.219.818.717.517.915.914.314.715.114.513.713.511.010.510.410.311.010.29.910.510.19.910.39.58.18.27.17.27.37.58.28.38.78.98.25.05.35.65.65.86.4

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-312009-12-312008-12-31
Value83105112505963-21-41-58-62-54-54-48-83-137-140-150-135-175-172-228-277-277-278-270-250-322-344-426-433-421-364-361-370-328-346-971-997-868-925-934-593
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.40.50.50.20.30.3-0.1-0.2-0.3-0.3-0.2-0.2-0.2-0.3-0.4-0.4-0.5-0.4-0.5-0.5-0.7-0.8-0.8-0.8-0.7-0.7-0.9-1.0-1.2-1.2-1.2-1.1-1.1-1.2-1.1-1.1-1.9-2.0-1.8-1.9-2.0-1.4

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities



Period End2020-03-312019-12-312019-03-312018-12-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-03-31
Value7017005158553524964083091155177410881470122915287699731034108018182592288586112788491960839
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax68.556.842.962.023.937.526.620.246.359.737.041.70.037.220.324.127.128.447.012.314.74.644.05.012.28.2

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities



Period End2020-03-312019-12-312019-03-312018-12-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-03-31
Value-611-894-564-549258-247-1771-14422-1544-12521048-1110-1037-1195-806-5056-738-1040-833-365-1114-1132-10-1072-1558
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-59.7-72.5-47.0-39.817.5-18.7-115.7-94.10.1-52.0-42.629.70.0-25.3-31.6-20.0-132.7-19.4-26.9-4.0-1.9-6.0-39.0-0.1-6.7-15.2

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-03-31
Value-131-113-72-278-72-404-377-29-49-1043-864-46-50-37-44-431198-1068-1391807-138-173-77-533-810-208-413367-157-113-403-17812-212-176-798-172-2021307
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-12.8-9.2-5.8-20.1-6.0-29.3-24.5-2.0-3.2-78.1-76.1-4.3-4.714.0-3.6-3.3164.1-72.4-10.5118.0-9.0-6.9-2.6-18.1-23.00.0-10.19.7-3.9-3.0-10.6-46.10.0-1.1-0.9-27.5-1.0-1.312.7

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities



Period End2020-03-312019-12-312019-03-312018-12-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-03-31
Value7017005158553524964083091155177410881470122915287699731034108018182592288586112788491960839
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax68.556.842.962.023.937.526.620.246.359.737.041.70.037.220.324.127.128.447.012.314.74.644.05.012.28.2

Net Income Loss

us-gaap:NetIncomeLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-03-31
Value-46-2016516117439025496356-28-599-139-4957-1371-192-170-407-793-749-386-2769264315401149569426383450393417549405996996706696709457355413282
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-4.5-1.613.211.714.528.316.56.623.2-2.1-52.7-13.1-462.4517.4-15.6-13.1-55.8-53.8-56.6-25.2-18.037.114.518.432.614.510.99.310.810.410.314.410.725.84.73.63.724.42.72.22.92.7

us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-25-201-58-150-19-63-16999
Percentage of NetIncomeLoss54.31005.0-35.2-93.2-10.9-24.8-176.027.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-2.4-16.3-4.6-10.9-1.6-4.1-11.76.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:CorporateNonSegment0.00.00.00.00.00.00.00.0

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, mro:InternationalExplorationAndProduction



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-133439661116142132
Percentage of NetIncomeLoss2.2-165.026.159.635.145.7147.937.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.12.73.47.05.17.59.88.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments mro:InternationalExplorationAndProduction-1.950.855.853.044.260.762.832.0

us-gaap:OperatingSegments, mro:NorthAmericaExplorationAndProduction



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-20148180215132201123125
Percentage of NetIncomeLoss43.5-740.0109.1133.575.979.1128.135.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-2.012.014.415.611.013.18.58.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments mro:NorthAmericaExplorationAndProduction-2.112.715.417.912.414.910.111.1

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedDefinedBenefitPlansAdjustment



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value17024-13-5
Percentage of NetIncomeLoss-2.242.41.22.3-5.1-5.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.15.60.10.3-0.8-0.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.0

us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings



Period End2020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312011-12-312011-09-30
Value-4616516117439025496356-28549405
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-4.513.211.714.528.316.56.623.2-2.114.410.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.0

Depreciation Depletion And Amortization

us-gaap:DepreciationDepletionAndAmortization



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-03-31
Value644616622605554613626612590583641592556631594561609668717751821801737680697720738747625580574550517564852893765416649653627660
Percentage of DepreciationDepletionAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value66866766888
Percentage of DepreciationDepletionAndAmortization0.91.01.31.01.11.11.01.01.41.41.2

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, mro:InternationalExplorationAndProduction



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value212425383444495054621028975
Percentage of DepreciationDepletionAndAmortization3.33.94.06.36.17.27.88.29.210.615.915.013.5

us-gaap:OperatingSegments, mro:NorthAmericaExplorationAndProduction



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value617586589561514562571556528513531495472
Percentage of DepreciationDepletionAndAmortization95.895.194.792.792.891.791.290.889.588.082.883.684.9

Increase Decrease In Other Operating Capital Net

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-03-31
Value181072815438105-7890894123-36843316-5714101191667-313128-135-1824-509-30-92-643-4-67-83-29
Percentage of IncreaseDecreaseInOtherOperatingCapitalNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Increase Decrease In Inventories

us-gaap:IncreaseDecreaseInInventories



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-03-31
Value61-11-4-10-689-6-9-5106-51-23-7-6-9-4322-21-2617411525-714-1320-366-494624-194235-58-18
Percentage of IncreaseDecreaseInInventories100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities



Period End2020-03-312019-12-312019-03-312018-12-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-03-31
Value-611-894-564-549258-247-1771-14422-1544-12521048-1110-1037-1195-806-5056-738-1040-833-365-1114-1132-10-1072-1558
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-59.7-72.5-47.0-39.817.5-18.7-115.7-94.10.1-52.0-42.629.70.0-25.3-31.6-20.0-132.7-19.4-26.9-4.0-1.9-6.0-39.0-0.1-6.7-15.2

Payments To Acquire Property Plant And Equipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-03-31
Value62061667264761568476963866266953049228326223029945452862886814521521140911791051137511641017858735640106211281774512134814821586
Percentage of PaymentsToAcquirePropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Payments To Acquire Investments

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-03-31
Value-131-113-72-278-72-404-377-29-49-1043-864-46-50-37-44-431198-1068-1391807-138-173-77-533-810-208-413367-157-113-403-17812-212-176-798-172-2021307
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-12.8-9.2-5.8-20.1-6.0-29.3-24.5-2.0-3.2-78.1-76.1-4.3-4.714.0-3.6-3.3164.1-72.4-10.5118.0-9.0-6.9-2.6-18.1-23.00.0-10.19.7-3.9-3.0-10.6-46.10.0-1.1-0.9-27.5-1.0-1.312.7

Proceeds From Issuance Of Long Term Debt

Repayments Of Long Term Debt

Payments Of Dividends

us-gaap:PaymentsOfDividends



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-03-31
Value404040414141434342424343424342433433142143142142141127133120119121105106178178178176178172169170
Percentage of PaymentsOfDividends100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Payments Of Dividends

us-gaap:PaymentsOfDividends



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-03-31
Value404040414141434342424343424342433433142143142142141127133120119121105106178178178176178172169170
Percentage of PaymentsOfDividends100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Payments For Repurchase Of Common Stock

us-gaap:PaymentsForRepurchaseOfCommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-31
Value92663023630364338291037-514000000044955150000
Percentage of PaymentsForRepurchaseOfCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.0100.0100.0100.00.00.0

Repayments Of Long Term Debt

Debt Instrument Interest Rate Stated Percentage

Effective Income Tax Rate Continuing Operations

us-gaap:EffectiveIncomeTaxRateContinuingOperations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-31
Value0.060.050000000000000020.060.17-5.44-0.079999999999999990.290.310.320.459999999999999960.310.372.131.1-0.34-0.280.4-0.530.10000000000000003-0.160000000000000030.34-0.0300000000000000270.0-0.20.520.730.0200000000000000180.69-0.0300000000000000270.0400000000000000360.169999999999999980.43-0.020000000000000018-0.0300000000000000270.0200000000000000180.530.050000000000000044
Percentage of EffectiveIncomeTaxRateContinuingOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312010-09-302009-12-31
Value6556667810101010121112131412121313131315181818191919212121212121212118
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312010-09-302009-12-31
Value21.3323.5523.4223.6523.624.3925.8925.4124.3925.5225.5725.3726.9727.7127.8327.4227.2729.9729.9929.9729.6529.6829.6729.6827.6127.2726.9926.8526.6526.1925.4725.3325.2724.4124.4724.4334.1234.035.01
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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

us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod

mro:RestrictedStockAwardsAndRestrictedStockUnits



Period End2020-03-312019-09-302019-06-302019-03-31
Value5003
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod100.0100.0100.0100.0

us-gaap:TitleOfIndividual, us-gaap:AwardType

mro:GrantedOfficer, mro:PerformanceUnit



Period End2020-03-312019-12-312019-09-30
Value100
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod19.50.00.0

Share Based Compensation

us-gaap:ShareBasedCompensation



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value15151318149161414121212141111131310
Percentage of ShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Liabilities

Deferred Tax Assets Net

Unrecognized Tax Benefits

Deferred Tax Assets Valuation Allowance

Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions

Operating Lease Right Of Use Asset

Cash And Cash Equivalents Period Increase Decrease

Proceeds From Repayments Of Short Term Debt

mro:AssetRetirementObligationHeldForSale



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value0216-972286298-7989046
Percentage of AssetRetirementObligationHeldForSale0.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0

mro:AssetRetirementObligationIncreaseDecreaseNoncashExcludingDispositions



Period End2020-03-312019-09-302019-06-302019-03-312018-09-30
Value-81162313
Percentage of AssetRetirementObligationIncreaseDecreaseNoncashExcludingDispositions100.0100.0100.0100.0100.0

mro:AssetRetirementObligationLiabilitiesTransferred



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-31
Value009731198-164792101220-46329542282300307094388
Percentage of AssetRetirementObligationLiabilitiesTransferred0.00.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.00.0100.0100.0100.0100.0100.0100.00.00.0100.00.0100.0100.0100.0

us-gaap:DerivativeInstrumentRisk

mro:DerivativeInstrumentNotDesignatedAsHedgingInstrumentsGainLossOnSettlementsNet

us-gaap:CommodityContract



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value311114522-26-89-107-59-634
Percentage of DerivativeInstrumentNotDesignatedAsHedgingInstrumentsGainLossOnSettlementsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

mro:DerivativeWeightedAverageCommodityPrice

mro:ArgusWTIHoustonBasisSwapsCrudeOil2020Q2, us-gaap:Nondesignated



Period End2020-03-31
Value-0.75
Percentage of DerivativeWeightedAverageCommodityPrice100.0

mro:ArgusWTIHoustonBasisSwapsCrudeOil2020Q3, us-gaap:Nondesignated



Period End2020-03-31
Value0.0
Percentage of DerivativeWeightedAverageCommodityPrice-0.0

mro:ArgusWTIHoustonBasisSwapsCrudeOil2020Q4, us-gaap:Nondesignated



Period End2020-03-31
Value0.0
Percentage of DerivativeWeightedAverageCommodityPrice-0.0

mro:ArgusWTIHoustonBasisSwapsCrudeOil2021, us-gaap:Nondesignated



Period End2020-03-31
Value0.0
Percentage of DerivativeWeightedAverageCommodityPrice-0.0

mro:BrentBasisSwapsCrudeOil2020Q2, us-gaap:Nondesignated



Period End2020-03-31
Value-7.24
Percentage of DerivativeWeightedAverageCommodityPrice965.3

mro:BrentBasisSwapsCrudeOil2020Q3, us-gaap:Nondesignated



Period End2020-03-31
Value-7.24
Percentage of DerivativeWeightedAverageCommodityPrice965.3

mro:BrentBasisSwapsCrudeOil2020Q4, us-gaap:Nondesignated



Period End2020-03-31
Value-7.24
Percentage of DerivativeWeightedAverageCommodityPrice965.3

mro:BrentBasisSwapsCrudeOil2021, us-gaap:Nondesignated



Period End2020-03-31
Value-7.24
Percentage of DerivativeWeightedAverageCommodityPrice965.3

mro:FixedRateSwapsCrudeOil2020Q2, us-gaap:Nondesignated



Period End2020-03-31
Value24.61
Percentage of DerivativeWeightedAverageCommodityPrice-3281.3

mro:FixedRateSwapsCrudeOil2020Q3, us-gaap:Nondesignated



Period End2020-03-31
Value0.0
Percentage of DerivativeWeightedAverageCommodityPrice-0.0

mro:FixedRateSwapsCrudeOil2020Q4, us-gaap:Nondesignated



Period End2020-03-31
Value0.0
Percentage of DerivativeWeightedAverageCommodityPrice-0.0

mro:FixedRateSwapsCrudeOil2021, us-gaap:Nondesignated



Period End2020-03-31
Value0.0
Percentage of DerivativeWeightedAverageCommodityPrice-0.0

mro:MidlandBasisSwapsCrudeOil2020Q2, us-gaap:Nondesignated



Period End2020-03-31
Value-0.94
Percentage of DerivativeWeightedAverageCommodityPrice125.3

mro:MidlandBasisSwapsCrudeOil2020Q3, us-gaap:Nondesignated



Period End2020-03-31
Value-0.94
Percentage of DerivativeWeightedAverageCommodityPrice125.3

mro:MidlandBasisSwapsCrudeOil2020Q4, us-gaap:Nondesignated



Period End2020-03-31
Value-0.94
Percentage of DerivativeWeightedAverageCommodityPrice125.3

mro:MidlandBasisSwapsCrudeOil2021, us-gaap:Nondesignated



Period End2020-03-31
Value0.0
Percentage of DerivativeWeightedAverageCommodityPrice-0.0

mro:NYMEXRollBasisSwapsCrudeOil2020Q2, us-gaap:Nondesignated



Period End2020-03-31
Value-1.62
Percentage of DerivativeWeightedAverageCommodityPrice216.0

mro:NYMEXRollBasisSwapsCrudeOil2020Q3, us-gaap:Nondesignated



Period End2020-03-31
Value0.0
Percentage of DerivativeWeightedAverageCommodityPrice-0.0

mro:NYMEXRollBasisSwapsCrudeOil2020Q4, us-gaap:Nondesignated



Period End2020-03-31
Value0.0
Percentage of DerivativeWeightedAverageCommodityPrice-0.0

mro:NYMEXRollBasisSwapsCrudeOil2021, us-gaap:Nondesignated



Period End2020-03-31
Value0.0
Percentage of DerivativeWeightedAverageCommodityPrice-0.0

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

mro:ArgusWTIHoustonBasisSwapsCrudeOil2020Q2, us-gaap:Nondesignated, us-gaap:SubsequentEvent



Period End2020-05-04
Value-0.75
Percentage of DerivativeWeightedAverageCommodityPrice0.0

mro:ArgusWTIHoustonBasisSwapsCrudeOil2020Q3, us-gaap:Nondesignated, us-gaap:SubsequentEvent



Period End2020-05-04
Value0.0
Percentage of DerivativeWeightedAverageCommodityPrice0.0

mro:ArgusWTIHoustonBasisSwapsCrudeOil2020Q4, us-gaap:Nondesignated, us-gaap:SubsequentEvent



Period End2020-05-04
Value0.0
Percentage of DerivativeWeightedAverageCommodityPrice0.0

mro:ArgusWTIHoustonBasisSwapsCrudeOil2021, us-gaap:Nondesignated, us-gaap:SubsequentEvent



Period End2020-05-04
Value0.0
Percentage of DerivativeWeightedAverageCommodityPrice0.0

mro:BrentBasisSwapsCrudeOil2020Q2, us-gaap:Nondesignated, us-gaap:SubsequentEvent



Period End2020-05-04
Value-7.24
Percentage of DerivativeWeightedAverageCommodityPrice0.0

mro:BrentBasisSwapsCrudeOil2020Q3, us-gaap:Nondesignated, us-gaap:SubsequentEvent



Period End2020-05-04
Value-7.24
Percentage of DerivativeWeightedAverageCommodityPrice0.0

mro:BrentBasisSwapsCrudeOil2020Q4, us-gaap:Nondesignated, us-gaap:SubsequentEvent



Period End2020-05-04
Value-7.24
Percentage of DerivativeWeightedAverageCommodityPrice0.0

mro:BrentBasisSwapsCrudeOil2021, us-gaap:Nondesignated, us-gaap:SubsequentEvent



Period End2020-05-04
Value-7.24
Percentage of DerivativeWeightedAverageCommodityPrice0.0

mro:FixedRateWTISwapsCrudeOil2020Q2, us-gaap:Nondesignated, us-gaap:SubsequentEvent



Period End2020-05-04
Value28.99
Percentage of DerivativeWeightedAverageCommodityPrice0.0

mro:FixedRateWTISwapsCrudeOil2020Q3, us-gaap:Nondesignated, us-gaap:SubsequentEvent



Period End2020-05-04
Value32.77
Percentage of DerivativeWeightedAverageCommodityPrice0.0

mro:FixedRateWTISwapsCrudeOil2020Q4, us-gaap:Nondesignated, us-gaap:SubsequentEvent



Period End2020-05-04
Value0.0
Percentage of DerivativeWeightedAverageCommodityPrice0.0

mro:FixedRateWTISwapsCrudeOil2021, us-gaap:Nondesignated, us-gaap:SubsequentEvent



Period End2020-05-04
Value0.0
Percentage of DerivativeWeightedAverageCommodityPrice0.0

mro:MidlandBasisSwapsCrudeOil2020Q2, us-gaap:Nondesignated, us-gaap:SubsequentEvent



Period End2020-05-04
Value-0.94
Percentage of DerivativeWeightedAverageCommodityPrice0.0

mro:MidlandBasisSwapsCrudeOil2020Q3, us-gaap:Nondesignated, us-gaap:SubsequentEvent



Period End2020-05-04
Value-0.94
Percentage of DerivativeWeightedAverageCommodityPrice0.0

mro:MidlandBasisSwapsCrudeOil2020Q4, us-gaap:Nondesignated, us-gaap:SubsequentEvent



Period End2020-05-04
Value-0.94
Percentage of DerivativeWeightedAverageCommodityPrice0.0

mro:MidlandBasisSwapsCrudeOil2021, us-gaap:Nondesignated, us-gaap:SubsequentEvent



Period End2020-05-04
Value0.0
Percentage of DerivativeWeightedAverageCommodityPrice0.0

mro:NYMEXRollBasisSwapsCrudeOil2020Q2, us-gaap:Nondesignated, us-gaap:SubsequentEvent



Period End2020-05-04
Value-1.62
Percentage of DerivativeWeightedAverageCommodityPrice0.0

mro:NYMEXRollBasisSwapsCrudeOil2020Q3, us-gaap:Nondesignated, us-gaap:SubsequentEvent



Period End2020-05-04
Value-1.58
Percentage of DerivativeWeightedAverageCommodityPrice0.0

mro:NYMEXRollBasisSwapsCrudeOil2020Q4, us-gaap:Nondesignated, us-gaap:SubsequentEvent



Period End2020-05-04
Value-1.94
Percentage of DerivativeWeightedAverageCommodityPrice0.0

mro:NYMEXRollBasisSwapsCrudeOil2021, us-gaap:Nondesignated, us-gaap:SubsequentEvent



Period End2020-05-04
Value0.0
Percentage of DerivativeWeightedAverageCommodityPrice0.0

mro:InvestmentsRepaymentsOfLoansAndReturnOfCapital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-03-312009-03-31
Value713237129162391503712810231416302110151972018615185828671426
Percentage of InvestmentsRepaymentsOfLoansAndReturnOfCapital100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mro:NetInterestAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-31
Value-64-67-64-64-49-58-58-65-45-71-35-86-78-77-87-86-85-87-75-58-47-58-55-76-52-66-71-72-53-57-50
Percentage of NetInterestAndOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value-64-67-64-64-49-58-58-65-45-71-35
Percentage of NetInterestAndOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mro:NetSettlementOfDerivativeInstruments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value311114522-26-89-107-59-4385
Percentage of NetSettlementOfDerivativeInstruments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mro:PaymentsforProceedsfromOtherProductiveAssets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value151-28-14-10965772
Percentage of PaymentsforProceedsfromOtherProductiveAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-221816-5065-49
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-221816-5065-49
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302009-09-30
Value666556810121213141313131325546610107955111211
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssetRetirementObligationAccretionExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value3231313171718182025
Percentage of AssetRetirementObligationAccretionExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssetRetirementObligationLiabilitiesIncurred



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value19761211244610
Percentage of AssetRetirementObligationLiabilitiesIncurred100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssetRetirementObligationLiabilitiesSettled



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312013-03-312012-03-31
Value24977201091291681013887
Percentage of AssetRetirementObligationLiabilitiesSettled100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssetRetirementObligationRevisionOfEstimate



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value-9314011-74-121-90-11496
Percentage of AssetRetirementObligationRevisionOfEstimate100.0100.0100.00.0100.0100.0100.0100.00.0100.0100.0

us-gaap:FairValueByMeasurementFrequency

us-gaap:AssetsFairValueAdjustment

us-gaap:FairValueMeasurementsNonrecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-312015-09-302014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value20018625834824201041947793-337-2-109-4-17-47-110-38
Percentage of AssetsFairValueAdjustment100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0

us-gaap:CapitalExpendituresIncurredButNotYetPaid



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value238-1425025012238303279-31241077600001419937589847-49-105
Percentage of CapitalExpendituresIncurredButNotYetPaid100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect



Period End2020-03-312019-03-31
Value-41-120
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect100.0100.0

us-gaap:CommonStockDividendsPerShareCashPaid



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-03-31
Value0.050.050000000000000020.050.050.050.050000000000000020.050.050.050.050000000000000020.050.050.050.050000000000000020.050.050.050.0500000000000000440.210.210.210.210000000000000080.210.190.190.190.170.170.170.170.170.150000000000000020.150.250.250.250.250.250.240.240.240.24
Percentage of CommonStockDividendsPerShareCashPaid100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CumulativeEffectOnRetainedEarningsNetOfTax1



Period End2020-03-312019-03-31
Value-12-31
Percentage of CumulativeEffectOnRetainedEarningsNetOfTax1100.0100.0

us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings



Period End2020-03-312019-03-31
Value-12-31
Percentage of CumulativeEffectOnRetainedEarningsNetOfTax1100.0100.0

us-gaap:DeferredIncomeTaxExpenseBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-03-31
Value-10-1-2-31-106825-31-105624141315-112-72-320-216-405-6-179-249164681054497-22-107352-185-242-3720-203-2534650
Percentage of DeferredIncomeTaxExpenseBenefit100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value0.00.0-1000000.00.00.00.00.0-1000000.00.00.00.00.00.00.00.0
Percentage of DefinedBenefitPlanAmortizationOfGainsLosses0.00.0100.00.00.00.00.0100.00.00.00.00.00.00.00.0

us-gaap:PensionPlansDefinedBenefit



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-30
Value-3-2-2-2-3-3-3-3-2-2-4
Percentage of DefinedBenefitPlanAmortizationOfGainsLosses0.0200.00.00.00.0300.00.00.00.00.00.0

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value-4-5-5-4-4-2-2-2-2-2-2-1-20-1
Percentage of DefinedBenefitPlanAmortizationOfPriorServiceCostCredit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0

us-gaap:PensionPlansDefinedBenefit



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-30
Value-2-1-2-2-2-3-2-3-2-2-2
Percentage of DefinedBenefitPlanAmortizationOfPriorServiceCostCredit50.020.050.050.0100.0150.0100.0150.0200.0100.0200.0

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets

us-gaap:PensionPlansDefinedBenefit



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-30
Value338898910101212
Percentage of DefinedBenefitPlanExpectedReturnOnPlanAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanInterestCost

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value10111122222
Percentage of DefinedBenefitPlanInterestCost100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value33777677
Percentage of DefinedBenefitPlanInterestCost300.0300.0700.0700.0350.0300.0350.0350.0

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value-3-4-3-3-30011101123
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost100.0100.0100.0100.0100.00.00.0100.0100.0100.00.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-30
Value866313571051619
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost-266.7-200.0-200.0-100.00.0500.0700.00.0500.01600.0633.3

us-gaap:DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value0-6225-3-80-3-3-5-1-10
Percentage of DefinedBenefitPlanRecognizedNetGainLossDueToSettlements10.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value0-6213-5-11-2-5-7-5
Percentage of DefinedBenefitPlanRecognizedNetGainLossDueToSettlements10.0100.0100.050.060.0166.7137.50.0166.7233.3100.0

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, mro:InternationalExplorationAndProduction



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value0001223224022
Percentage of DefinedBenefitPlanRecognizedNetGainLossDueToSettlements10.0-0.00.050.040.0-66.7-37.50.0-66.7-133.3-0.0-200.0-20.0

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, mro:AccumulatedDefinedBenefitPlanAdjustmentNetGainLossDueToSettlementAttributableToParent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value-2-100-20-5-10-2-4-7-8
Percentage of DefinedBenefitPlanRecognizedNetGainLossDueToSettlements10.0166.70.0-100.00.0166.7125.00.0133.3233.3160.0

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceCostCredit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value6766631-45429-5
Percentage of DefinedBenefitPlanRecognizedNetGainLossDueToSettlements10.0-116.7300.0300.0120.0-1033.350.00.0-133.3-966.7100.0

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value-3-1-3-2-2-2-3-4-3-2-3
Percentage of DefinedBenefitPlanRecognizedNetGainLossDueToSettlements10.016.7-150.0-100.0-40.066.737.50.0100.066.760.0

us-gaap:RetirementPlanType

us-gaap:PensionPlansDefinedBenefit



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value-20-20-10-2-4-8
Percentage of DefinedBenefitPlanRecognizedNetGainLossDueToSettlements10.00.0-100.00.0125.00.0133.3160.0

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanServiceCost

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value0.01000000.00.00.00.01000000.00.00.01000000.01000000.00.0
Percentage of DefinedBenefitPlanServiceCost0.0100.00.00.00.0100.00.00.0100.0100.00.0

us-gaap:PensionPlansDefinedBenefit



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value55544545
Percentage of DefinedBenefitPlanServiceCost0.00.00.00.00.00.0400.00.0

us-gaap:DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value202-444716-91310-70-152-102-151-225681
Percentage of DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value171-553311-11333619-45-43-145-56
Percentage of DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet84.7125.070.268.8124.2108.4-27.129.642.296.0254.5

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, mro:NorthAmericaExplorationAndProduction



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value311114522-26-89-107-59-634134
Percentage of DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet15.3-25.029.831.2-24.2-8.4127.170.457.84.0-154.523.24.9

us-gaap:DerivativeInstrumentRisk

us-gaap:CommodityContract



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value171-553311-11333619-45-43-145-56
Percentage of DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet84.7125.070.268.8124.2108.4-27.129.642.296.0254.5

us-gaap:DividendsCommonStockCash



Period End2020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312011-12-31
Value404041414143434242105
Percentage of DividendsCommonStockCash100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings



Period End2020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312011-12-31
Value404041414143434242105
Percentage of DividendsCommonStockCash100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EffectOfExchangeRateOnCashAndCashEquivalents



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312014-03-312013-03-312012-06-302012-03-312011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-03-31
Value00-10100-311-86-210-24010-4-61-4
Percentage of EffectOfExchangeRateOnCashAndCashEquivalents0.00.0100.00.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0

us-gaap:EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-305861824919715114397219147113152
Percentage of EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-264745633212812912379148125101134
Percentage of EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EquityMethodInvestmentSummarizedFinancialInformationRevenue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value172195184233220605238228198613243199239
Percentage of EquityMethodInvestmentSummarizedFinancialInformationRevenue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ExplorationAbandonmentAndImpairmentExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-03-31
Value222916204911151514229249252024371551150656081674036411343404116584647911731031159523316
Percentage of ExplorationAbandonmentAndImpairmentExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ExplorationExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-03-31
Value284222265911656655257294302834831892453258511190479961457615313346517617314214012914523021659125981265562
Percentage of ExplorationExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value00000400000250
Percentage of ExplorationExpense0.00.00.00.00.034.50.00.00.00.085.0

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, mro:InternationalExplorationAndProduction



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value0000001110302
Percentage of ExplorationExpense0.00.00.00.00.00.01.81.51.90.01.00.07.1

us-gaap:OperatingSegments, mro:NorthAmericaExplorationAndProduction



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value28422226597655645157413026
Percentage of ExplorationExpense100.0100.0100.0100.0100.065.598.298.598.1100.013.9100.092.9

us-gaap:GainLossOnDispositionOfAssets1



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value9-622-842-4165025732196110847294-60228-10901-2-3-872
Percentage of GainLossOnDispositionOfAssets1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value9-622-842-416502573318
Percentage of GainLossOnDispositionOfAssets1100.0100.0100.0100.0100.0100.0100.0100.0100.0103.194.7

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, mro:NorthAmericaExplorationAndProduction



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value0.00.00.00.00.00.00.00.00.0-1000000.01000000.0
Percentage of GainLossOnDispositionOfAssets10.0-0.00.0-0.00.0-0.00.00.00.0-3.15.3

us-gaap:GainLossOnSaleOfDerivatives



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value202-444716-91310-70-152-102-151226377-1540-86-238105
Percentage of GainLossOnSaleOfDerivatives100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:GoodwillImpairmentLoss



Period End2020-03-312019-03-31
Value950
Percentage of GoodwillImpairmentLoss100.00.0

us-gaap:ImpairmentOfOilAndGasProperties



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value970018625834824201041947013713374402109417
Percentage of ImpairmentOfOilAndGasProperties100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.0100.00.0100.0100.0100.0100.0

us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value970018625834824201
Percentage of ImpairmentOfOilAndGasProperties100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, mro:NorthAmericaExplorationAndProduction



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value0000000000004
Percentage of ImpairmentOfOilAndGasProperties0.00.00.00.00.00.00.00.00.00.00.00.0100.0

us-gaap:IncomeLossFromEquityMethodInvestments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-03-31
Value-122421311164646037736351696559371447362636788912013711477118122607810212312012611395831051147547
Percentage of IncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, mro:InternationalExplorationAndProduction



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-12242131116464603773635169
Percentage of IncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-03-31
Value-288-142-14-3-155-322615-48-139-48-308-4-34-324-61-334348-2821-31-37-2849-18-4-42420-11
Percentage of IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0

us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-03-31
Value-234-23-6-56-102-1552015281108230-40-1103-25-90-121-11-184-301-46982-84-160129-54-663213124-387487001313226834481028-473
Percentage of IncreaseDecreaseInAccountsPayableAndAccruedLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInOtherCurrentAssetsAndLiabilitiesNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1611211-105-1422-8-1725
Percentage of IncreaseDecreaseInOtherCurrentAssetsAndLiabilitiesNet100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInPensionAndPostretirementObligations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value-11-1-10-16-25-5-9-17-34-8-13-16-9-5-12014-8-521-7-7-535217-29
Percentage of IncreaseDecreaseInPensionAndPostretirementObligations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInReceivables



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-03-31
Value-407-15142273-25613312613014217714190-5245-133-79-204-146-388-3894220464-189296194-124-708630508655-180193391-200
Percentage of IncreaseDecreaseInReceivables100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestPaidNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-31
Value5279120122-528353825211076129641326690871255788558852935661635071114146914401439-7
Percentage of InterestPaidNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax



Period End2020-03-312019-03-312018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312013-09-302012-09-30
Value-22000000-1415920001
Percentage of OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax100.00.00.00.00.00.00.0100.0100.0100.0100.00.00.00.0100.0

us-gaap:OtherComprehensiveIncomeLossNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-31
Value-22-762-9-48420174-80-63554310-1540-35601-8-2022827-57-39
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-2262-9-420174
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-31
Value010-7794-80-20-13-4-4-5-8-4-210-1924-682-86-7612-31330-34-133-13903-13
Percentage of OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax0.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherExpenses



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-31
Value14414313817015416715212613012210911189118189951091579381107159991011141268611111210792
Percentage of OtherExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherOperatingIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-03-31
Value78613351511912447891416231243612151123152020191091721518146353232333543552
Percentage of OtherOperatingIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value111731111380525
Percentage of OtherOperatingIncome14.312.516.753.888.66.795.066.70.0110.662.5

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, mro:InternationalExplorationAndProduction



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value222235421-80410
Percentage of OtherOperatingIncome28.625.033.315.48.633.33.416.725.0-17.00.044.471.4

us-gaap:OperatingSegments, mro:NorthAmericaExplorationAndProduction



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value4534192233324
Percentage of OtherOperatingIncome57.162.550.030.82.960.01.716.775.06.437.522.228.6

us-gaap:PaymentsForProceedsFromOtherInvestingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-03-31
Value01-2939-12-2-4-81744216-1300-250-23-12-14245-5-84712-138-38-1355-442511-62-6
Percentage of PaymentsForProceedsFromOtherInvestingActivities0.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RetirementPlanFundingStatus

us-gaap:PensionContributions

us-gaap:FundedPlan



Period End2020-03-312019-09-302019-06-302019-03-31
Value661118
Percentage of PensionContributions100.0100.0100.0100.0

us-gaap:UnfundedPlan



Period End2020-03-312019-09-302019-06-302019-03-31
Value5112
Percentage of PensionContributions83.316.79.111.1

us-gaap:ProceedsFromIncomeTaxRefunds



Period End2020-03-312019-03-31
Value35
Percentage of ProceedsFromIncomeTaxRefunds100.0100.0

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-03-31
Value1-5-2-1-114162001-11000037436477921317-51310620333250
Percentage of ProceedsFromPaymentsForOtherFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:ProceedsFromSaleOfOilAndGasPropertyAndEquipment



Period End2020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-06-302012-03-312011-06-302011-03-31
Value3-15356131566311803031172603827974117120103021523510921233121020828487
Percentage of ProceedsFromSaleOfOilAndGasPropertyAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PropertyPlantAndEquipmentAdditions



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value568601675701614697704662622638554599359284249177359561595678110216621508128211091708102511191216
Percentage of PropertyPlantAndEquipmentAdditions100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value710753975579
Percentage of PropertyPlantAndEquipmentAdditions1.21.71.00.70.51.31.00.80.81.11.6

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, mro:InternationalExplorationAndProduction



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value001105116166154149
Percentage of PropertyPlantAndEquipmentAdditions0.00.00.11.40.81.60.92.41.02.40.72.32.5

us-gaap:OperatingSegments, mro:NorthAmericaExplorationAndProduction



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value561591667686606677691641611616541575349
Percentage of PropertyPlantAndEquipmentAdditions98.898.398.897.998.797.198.296.898.296.697.796.097.2

us-gaap:ProvisionForDoubtfulAccounts



Period End2020-03-31
Value8
Percentage of ProvisionForDoubtfulAccounts100.0

us-gaap:ResultsOfOperationsProductionOrLiftingCosts



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312017-09-30
Value160169163193187205215205188197
Percentage of ResultsOfOperationsProductionOrLiftingCosts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312017-09-30
Value0000-230010
Percentage of ResultsOfOperationsProductionOrLiftingCosts0.00.00.00.0-1.11.50.00.00.50.0

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, mro:InternationalExplorationAndProduction



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312017-09-30
Value17141646505343525976
Percentage of ResultsOfOperationsProductionOrLiftingCosts10.68.39.823.826.725.920.025.431.438.6

us-gaap:OperatingSegments, mro:NorthAmericaExplorationAndProduction



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312017-09-30
Value143155147147139149172153128121
Percentage of ResultsOfOperationsProductionOrLiftingCosts89.491.790.276.274.372.780.074.668.161.4

us-gaap:ResultsOfOperationsTransportationCosts



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value144143138170154167152126130122109
Percentage of ResultsOfOperationsTransportationCosts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value14013170-100-2
Percentage of ResultsOfOperationsTransportationCosts0.72.80.07.60.64.20.0-0.80.00.0-1.8

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, mro:InternationalExplorationAndProduction



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value3211013251610191831
Percentage of ResultsOfOperationsTransportationCosts2.11.40.75.98.415.010.57.914.614.828.4

us-gaap:OperatingSegments, mro:NorthAmericaExplorationAndProduction



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value14013713714714013513611711110480
Percentage of ResultsOfOperationsTransportationCosts97.295.899.386.590.980.889.592.985.485.273.4

us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue

mro:RestrictedStockAwardsAndRestrictedStockUnits



Period End2020-03-312019-09-302019-06-302019-03-31
Value8.55-0.060000000000002274-0.01999999999999957416.98
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue100.0100.0100.0100.0

us-gaap:TitleOfIndividual, us-gaap:AwardType

mro:GrantedOfficer, mro:PerformanceUnit



Period End2020-03-312019-09-30
Value10.550.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue123.4-0.0

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312011-12-312011-09-30
Value38-5262142565550
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312011-12-312011-09-30
Value-8395-39-7-15-93-1-26
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation-218.4-180.0250.0-62.9-50.0-60.0-143.1-20.0-52.0

us-gaap:TreasuryStock



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312011-12-312011-09-30
Value121-14-31012140158676
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation318.4280.0-150.0162.9150.0160.0243.1120.0152.0

us-gaap:TaxesExcludingIncomeAndExciseTaxes



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-03-31
Value667981797284866564554445394239394843467867871151099891938463677860595312210999521159198102
Percentage of TaxesExcludingIncomeAndExciseTaxes100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value0110-210-30-20
Percentage of TaxesExcludingIncomeAndExciseTaxes0.01.31.20.0-2.81.20.0-4.60.0-3.60.0

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, mro:NorthAmericaExplorationAndProduction



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value66788079748386686457443339
Percentage of TaxesExcludingIncomeAndExciseTaxes100.098.798.8100.0102.898.8100.0104.6100.0103.6100.073.3100.0

us-gaap:TreasuryStockValueAcquiredCostMethod



Period End2020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312013-09-302011-12-312011-09-30
Value9130236303633392825001300
Percentage of TreasuryStockValueAcquiredCostMethod100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareRepurchaseProgram

mro:ShareRepurchaseProgram



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-30
Value85653023614338
Percentage of TreasuryStockValueAcquiredCostMethod93.40.0100.0100.046.799.7

us-gaap:StatementEquityComponents

us-gaap:TreasuryStock



Period End2020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312011-12-312011-09-30
Value9130236303633392821310
Percentage of TreasuryStockValueAcquiredCostMethod100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0103.3

us-gaap:WeightedAverageNumberDilutedSharesOutstandingAdjustment



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-312009-09-30
Value01111110000003334443343442222
Percentage of WeightedAverageNumberDilutedSharesOutstandingAdjustment0.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mro:ContractWithCustomerAccountsReceivableNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value477837822797751714937836802811
Percentage of ContractWithCustomerAccountsReceivableNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mro:Deferredcreditandotherliabilities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-31
Value220234265292317279340194197217217211221244297314283308225288
Percentage of Deferredcreditandotherliabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByMeasurementBasis

mro:FinancialAssetsFairValueDisclosure

us-gaap:CarryingReportedAmountFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value444239353594101137147922882860297128118206120118116133134129189159147147165164186
Percentage of FinancialAssetsFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value25303329298997133144921882857294126112198115104109134135132194166154154168165189
Percentage of FinancialAssetsFairValueDisclosure56.871.484.682.982.994.796.097.198.099.9100.099.799.098.494.996.195.888.194.0100.8100.7102.3102.6104.4104.8104.8101.8100.6101.6

mro:InventorySuppliesAndSundry



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302009-12-31
Value66626263718599106100117123129139196195241273278285286325299299304337309314320314288252236223214207219400404368439
Percentage of InventorySuppliesAndSundry100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mro:LiquidHydrocarbonsNaturalGas



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value1210991211111110991166
Percentage of LiquidHydrocarbonsNaturalGas100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByMeasurementBasis

mro:OtherCurrentLiabilitiesFairValueDisclosure

us-gaap:CarryingReportedAmountFairValueDisclosure



Period End2020-03-312019-12-31
Value9590
Percentage of OtherCurrentLiabilitiesFairValueDisclosure100.0100.0

us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-31
Value4262
Percentage of OtherCurrentLiabilitiesFairValueDisclosure44.268.9

us-gaap:FairValueByMeasurementBasis

mro:OtherNoncurrentAssetsFairValueDisclosure

us-gaap:CarryingReportedAmountFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value4038353132818689132161128107287121118206120118116133134129189159147147165164186
Percentage of OtherNoncurrentAssetsFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value2226292525768285129159127104284119112198115104109134135132194166154154168165189
Percentage of OtherNoncurrentAssetsFairValueDisclosure55.068.482.980.678.193.895.395.597.798.899.297.299.098.394.996.195.888.194.0100.8100.7102.3102.6104.4104.8104.8101.8100.6101.6

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-312009-12-312008-12-31
Value710272077197717071497238722672277237737973677349733674467442743374286498649364846532653165236530659965926603661466186616663466676658668066756723676367566756675167386696
Percentage of AdditionalPaidInCapital100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AllowanceForDoubtfulAccountsReceivable



Period End2020-03-312019-12-31
Value3011
Percentage of AllowanceForDoubtfulAccountsReceivable100.0100.0

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-312012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-312009-12-312008-12-31
Value3011121212118891275564444444300022771814146
Percentage of AllowanceForDoubtfulAccountsReceivableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssetRetirementObligation



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-312016-09-302015-12-312014-12-312014-09-302014-06-302013-12-312013-09-302013-06-302012-12-312011-12-312010-12-312009-12-312008-12-31
Value2472542162072101145130114151497148315821748153316351958203418292096212020791783151013551102965
Percentage of AssetRetirementObligation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssetRetirementObligationCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-312016-09-302015-12-312014-12-312014-09-302013-12-312013-09-302012-12-312010-12-312009-12-31
Value1111181818645851525560502134413187933413
Percentage of AssetRetirementObligationCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssetRetirementObligationsNoncurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-312009-12-312008-12-31
Value236243198189192108112431364144514281522164216221697160715971614160119651963194919172003180420622009202720391795174915161489143715101337133613681354116611211099963
Percentage of AssetRetirementObligationsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CapitalizedExploratoryWellCostsThatHaveBeenCapitalizedForPeriodGreaterThanOneYear



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312014-09-302014-06-302013-12-312013-09-302012-12-312011-12-312010-12-312009-12-312008-12-31
Value00000032323232329611811811811812085888812615510228122022922232315054
Percentage of CapitalizedExploratoryWellCostsThatHaveBeenCapitalizedForPeriodGreaterThanOneYear0.00.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsDisposalGroupIncludingDiscontinuedOperations



Period End2020-03-312019-12-312019-03-312018-12-312017-12-31
Value0032340
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsDisposalGroupIncludingDiscontinuedOperations0.00.0100.0100.00.0

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-06-302018-03-312017-12-31
Value817858116512961342146216671613563
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredIncomeTaxLiabilitiesNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value185186183184192199215237221833769
Percentage of DeferredIncomeTaxLiabilitiesNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementScenario

us-gaap:DefinedBenefitPlanExpectedAmortizationOfGainLossNextFiscalYear

srt:ScenarioForecast



Period End2020-12-31
Value-9
Percentage of DefinedBenefitPlanExpectedAmortizationOfGainLossNextFiscalYear100.0

us-gaap:StatementScenario, us-gaap:RetirementPlanType

srt:ScenarioForecast, us-gaap:OtherPostretirementBenefitPlansDefinedBenefit



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

us-gaap:StatementScenario

us-gaap:DefinedBenefitPlanExpectedAmortizationOfPriorServiceCostCreditNextFiscalYear

srt:ScenarioForecast



Period End2020-12-31
Value-7
Percentage of DefinedBenefitPlanExpectedAmortizationOfPriorServiceCostCreditNextFiscalYear100.0

us-gaap:StatementScenario, us-gaap:RetirementPlanType

srt:ScenarioForecast, us-gaap:OtherPostretirementBenefitPlansDefinedBenefit



Period End2020-12-31
Value-18
Percentage of DefinedBenefitPlanExpectedAmortizationOfPriorServiceCostCreditNextFiscalYear257.1

us-gaap:StatementScenario

us-gaap:DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear

srt:ScenarioForecast



Period End2020-12-31
Value28
Percentage of DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear100.0

us-gaap:StatementScenario, us-gaap:RetirementPlanType

srt:ScenarioForecast, mro:UnfundedPlans



Period End2020-12-31
Value6
Percentage of DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear21.4

srt:ScenarioForecast, us-gaap:OtherPostretirementBenefitPlansDefinedBenefit



Period End2020-12-31
Value18
Percentage of DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear64.3

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

us-gaap:DerivativeAssets

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



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312013-09-302012-12-31
Value29000021194800000000000000
Percentage of DerivativeAssets100.00.00.00.00.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

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



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312013-09-302012-12-31
Value1467613016106000106019046515161523552
Percentage of DerivativeAssets503.40.00.00.00.0504.80.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementFrequency

us-gaap:CommodityContract, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312013-09-302012-12-31
Value175761301612719480106019046515161523553
Percentage of DerivativeAssets603.40.00.00.00.0604.8100.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value29000021194800000000000000000000
Percentage of DerivativeAssets100.00.00.00.00.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value1469613016106000010114866814186359761636851117101791
Percentage of DerivativeAssets503.40.00.00.00.0504.80.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value175961301612719480010114866814186359761636851117101792
Percentage of DerivativeAssets603.40.00.00.00.0604.8100.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:DerivativeAssetsLiabilitiesAtFairValueNet

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312018-12-31
Value-293-21
Percentage of DerivativeAssetsLiabilitiesAtFairValueNet100.0100.0100.0

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312018-12-31
Value-126-9-106
Percentage of DerivativeAssetsLiabilitiesAtFairValueNet434.5-300.0504.8

us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312018-12-31
Value1556-127
Percentage of DerivativeAssetsLiabilitiesAtFairValueNet-534.5200.0604.8

us-gaap:DerivativeInstrumentRisk

us-gaap:DerivativeAverageVariableInterestRate

mro:InterestRateContractMaturingJune12025



Period End2020-03-31
Value0.0096
Percentage of DerivativeAverageVariableInterestRate100.0

mro:InterestRateContractMaturingNovember12022



Period End2020-03-31
Value0.0104
Percentage of DerivativeAverageVariableInterestRate108.3

us-gaap:DerivativeFairValueOfDerivativeAsset



Period End2020-03-312019-12-312019-09-302017-09-302017-06-302016-12-312016-03-312015-12-312015-09-302015-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-03-312011-12-312010-12-31
Value176126410114686359763617582691924590
Percentage of DerivativeFairValueOfDerivativeAsset100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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

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



Period End2020-03-31
Value0.0
Percentage of DerivativeFairValueOfDerivativeAsset0.0

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

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



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-09-302017-06-302017-03-312016-03-312015-12-312015-09-302015-03-312013-09-302013-06-302013-03-312012-12-31
Value176958331813110571651515523552852
Percentage of DerivativeFairValueOfDerivativeAsset100.075.090.60.00.00.0100.050.00.081.086.472.463.929.489.730.857.1

us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship

us-gaap:CashFlowHedging



Period End2020-03-312019-12-312019-09-30
Value020
Percentage of DerivativeFairValueOfDerivativeAsset0.016.70.0

us-gaap:HedgingDesignation

us-gaap:Nondesignated



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-312017-03-312016-12-312016-03-312015-12-312015-09-302015-03-312013-09-302013-06-302013-03-312012-12-312012-09-302010-12-31
Value1761064331913108668515161235528525058
Percentage of DerivativeFairValueOfDerivativeAsset100.083.3100.00.00.00.00.00.0100.081.086.480.363.929.489.730.857.154.364.4

us-gaap:DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral



Period End2020-03-312019-12-312019-09-302017-09-302017-06-302016-12-312016-03-312015-12-312015-09-302015-03-312013-09-302013-06-302012-12-31
Value1556575114856587336175891
Percentage of DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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

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



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-09-302017-06-302017-03-312016-03-312015-12-312015-09-302015-03-312013-09-302013-06-302012-12-31
Value1758532918131957164450532355252
Percentage of DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral112.9133.393.00.00.00.0180.050.00.078.686.272.663.929.489.757.1

us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship

us-gaap:CashFlowHedging



Period End2020-03-312019-12-312019-09-30
Value-202-1
Percentage of DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral-12.933.3-1.8

us-gaap:HedgingDesignation

us-gaap:Nondesignated



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-312017-03-312016-12-312016-03-312015-12-312015-09-302015-03-312013-09-302013-06-302012-12-31
Value1754582514127-1408484450582355252
Percentage of DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral112.966.7101.80.00.00.00.00.0100.078.686.279.563.929.489.757.1

us-gaap:DerivativeFairValueOfDerivativeLiability



Period End2020-03-312019-12-312019-09-302018-09-302017-12-312017-09-302017-06-302016-12-312016-03-312013-09-302013-06-302013-03-312012-09-302012-03-312010-12-31
Value2167210140506017283026683
Percentage of DerivativeFairValueOfDerivativeLiability100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0

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

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



Period End2020-03-312019-09-30
Value201
Percentage of DerivativeFairValueOfDerivativeLiability95.214.3

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

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



Period End2020-03-312019-12-312019-09-302019-06-30
Value1154
Percentage of DerivativeFairValueOfDerivativeLiability4.816.771.40.0

us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship

us-gaap:CashFlowHedging



Period End2020-03-312019-12-312019-09-30
Value2001
Percentage of DerivativeFairValueOfDerivativeLiability95.20.014.3

us-gaap:HedgingDesignation

us-gaap:Nondesignated



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312010-12-31
Value166854140502604370173
Percentage of DerivativeFairValueOfDerivativeLiability4.8100.085.70.00.00.0100.0100.00.00.0100.00.00.0100.0100.0

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

us-gaap:DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral

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



Period End2020-03-312019-09-30
Value201
Percentage of DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral100.0100.0

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

us-gaap:DerivativeLiabilities

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



Period End2020-03-312019-09-30
Value201
Percentage of DerivativeLiabilities100.0100.0

us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementFrequency

us-gaap:InterestRateContract, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-09-30
Value201
Percentage of DerivativeLiabilities100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-09-302014-06-302014-03-312013-12-312013-09-30
Value0-33-5-2000-2-20200000000000000
Percentage of DerivativeLiabilities0.00.0300.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-09-302014-06-302014-03-312013-12-312013-09-30
Value2001000229-276-182-12030260437024132617122428
Percentage of DerivativeLiabilities100.00.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-09-302014-06-302014-03-312013-12-312013-09-30
Value20-34-5-20229-276-184-14050260437024132617122428
Percentage of DerivativeLiabilities100.00.0400.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

us-gaap:DerivativeNonmonetaryNotionalAmount

mro:ArgusWTIHoustonBasisSwapsCrudeOil2020Q2, us-gaap:Nondesignated



Period End2020-03-31
Value26813.0
Percentage of DerivativeNonmonetaryNotionalAmount100.0

mro:ArgusWTIHoustonBasisSwapsCrudeOil2020Q3, us-gaap:Nondesignated



Period End2020-03-31
Value0.0
Percentage of DerivativeNonmonetaryNotionalAmount0.0

mro:ArgusWTIHoustonBasisSwapsCrudeOil2020Q4, us-gaap:Nondesignated



Period End2020-03-31
Value0.0
Percentage of DerivativeNonmonetaryNotionalAmount0.0

mro:FixedRateSwapsCrudeOil2020Q2, us-gaap:Nondesignated



Period End2020-03-31
Value20000.0
Percentage of DerivativeNonmonetaryNotionalAmount74.6

mro:FixedRateSwapsCrudeOil2020Q3, us-gaap:Nondesignated



Period End2020-03-31
Value0.0
Percentage of DerivativeNonmonetaryNotionalAmount0.0

mro:FixedRateSwapsCrudeOil2020Q4, us-gaap:Nondesignated



Period End2020-03-31
Value0.0
Percentage of DerivativeNonmonetaryNotionalAmount0.0

mro:FixedRateSwapsCrudeOil2021, us-gaap:Nondesignated



Period End2020-03-31
Value0.0
Percentage of DerivativeNonmonetaryNotionalAmount0.0

mro:NYMEXRollBasisSwapsCrudeOil2020Q2, us-gaap:Nondesignated



Period End2020-03-31
Value43571.0
Percentage of DerivativeNonmonetaryNotionalAmount162.5

mro:NYMEXRollBasisSwapsCrudeOil2020Q3, us-gaap:Nondesignated



Period End2020-03-31
Value0.0
Percentage of DerivativeNonmonetaryNotionalAmount0.0

mro:NYMEXRollBasisSwapsCrudeOil2020Q4, us-gaap:Nondesignated



Period End2020-03-31
Value0.0
Percentage of DerivativeNonmonetaryNotionalAmount0.0

mro:ThreeWayCollarsCrudeOil2020Q2, us-gaap:Nondesignated



Period End2020-03-312019-12-31
Value80000.060000.0
Percentage of DerivativeNonmonetaryNotionalAmount298.40.0

mro:ThreeWayCollarsCrudeOil2020Q3, us-gaap:Nondesignated



Period End2020-03-312019-12-31
Value80000.060000.0
Percentage of DerivativeNonmonetaryNotionalAmount298.40.0

mro:ThreeWayCollarsCrudeOil2020Q4, us-gaap:Nondesignated



Period End2020-03-312019-12-31
Value80000.060000.0
Percentage of DerivativeNonmonetaryNotionalAmount298.40.0

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

mro:ArgusWTIHoustonBasisSwapsCrudeOil2020Q2, us-gaap:Nondesignated, us-gaap:SubsequentEvent



Period End2020-05-04
Value26813.0
Percentage of DerivativeNonmonetaryNotionalAmount0.0

mro:ArgusWTIHoustonBasisSwapsCrudeOil2020Q3, us-gaap:Nondesignated, us-gaap:SubsequentEvent



Period End2020-05-04
Value0.0
Percentage of DerivativeNonmonetaryNotionalAmount0.0

mro:ArgusWTIHoustonBasisSwapsCrudeOil2020Q4, us-gaap:Nondesignated, us-gaap:SubsequentEvent



Period End2020-05-04
Value0.0
Percentage of DerivativeNonmonetaryNotionalAmount0.0

mro:ArgusWTIHoustonBasisSwapsCrudeOil2021, us-gaap:Nondesignated, us-gaap:SubsequentEvent



Period End2020-05-04
Value0.0
Percentage of DerivativeNonmonetaryNotionalAmount0.0

mro:BrentBasisSwapsCrudeOil2020Q2, us-gaap:Nondesignated, us-gaap:SubsequentEvent



Period End2020-05-04
Value5000.0
Percentage of DerivativeNonmonetaryNotionalAmount0.0

mro:BrentBasisSwapsCrudeOil2020Q3, us-gaap:Nondesignated, us-gaap:SubsequentEvent



Period End2020-05-04
Value5000.0
Percentage of DerivativeNonmonetaryNotionalAmount0.0

mro:BrentBasisSwapsCrudeOil2020Q4, us-gaap:Nondesignated, us-gaap:SubsequentEvent



Period End2020-05-04
Value5000.0
Percentage of DerivativeNonmonetaryNotionalAmount0.0

mro:BrentBasisSwapsCrudeOil2021, us-gaap:Nondesignated, us-gaap:SubsequentEvent



Period End2020-05-04
Value808.0
Percentage of DerivativeNonmonetaryNotionalAmount0.0

mro:FixedRateWTISwapsCrudeOil2020Q2, us-gaap:Nondesignated, us-gaap:SubsequentEvent



Period End2020-05-04
Value76703.0
Percentage of DerivativeNonmonetaryNotionalAmount0.0

mro:FixedRateWTISwapsCrudeOil2020Q3, us-gaap:Nondesignated, us-gaap:SubsequentEvent



Period End2020-05-04
Value10000.0
Percentage of DerivativeNonmonetaryNotionalAmount0.0

mro:FixedRateWTISwapsCrudeOil2020Q4, us-gaap:Nondesignated, us-gaap:SubsequentEvent



Period End2020-05-04
Value0.0
Percentage of DerivativeNonmonetaryNotionalAmount0.0

mro:FixedRateWTISwapsCrudeOil2021, us-gaap:Nondesignated, us-gaap:SubsequentEvent



Period End2020-05-04
Value0.0
Percentage of DerivativeNonmonetaryNotionalAmount0.0

mro:MidlandBasisSwapsCrudeOil2020Q2, us-gaap:Nondesignated, us-gaap:SubsequentEvent



Period End2020-05-04
Value15000.0
Percentage of DerivativeNonmonetaryNotionalAmount0.0

mro:MidlandBasisSwapsCrudeOil2020Q3, us-gaap:Nondesignated, us-gaap:SubsequentEvent



Period End2020-05-04
Value15000.0
Percentage of DerivativeNonmonetaryNotionalAmount0.0

mro:MidlandBasisSwapsCrudeOil2020Q4, us-gaap:Nondesignated, us-gaap:SubsequentEvent



Period End2020-05-04
Value15000.0
Percentage of DerivativeNonmonetaryNotionalAmount0.0

mro:MidlandBasisSwapsCrudeOil2021, us-gaap:Nondesignated, us-gaap:SubsequentEvent



Period End2020-05-04
Value0.0
Percentage of DerivativeNonmonetaryNotionalAmount0.0

mro:NYMEXRollBasisSwapsCrudeOil2020Q2, us-gaap:Nondesignated, us-gaap:SubsequentEvent



Period End2020-05-04
Value43571.0
Percentage of DerivativeNonmonetaryNotionalAmount0.0

mro:NYMEXRollBasisSwapsCrudeOil2020Q3, us-gaap:Nondesignated, us-gaap:SubsequentEvent



Period End2020-05-04
Value60000.0
Percentage of DerivativeNonmonetaryNotionalAmount0.0

mro:NYMEXRollBasisSwapsCrudeOil2020Q4, us-gaap:Nondesignated, us-gaap:SubsequentEvent



Period End2020-05-04
Value10000.0
Percentage of DerivativeNonmonetaryNotionalAmount0.0

mro:NYMEXRollBasisSwapsCrudeOil2021, us-gaap:Nondesignated, us-gaap:SubsequentEvent



Period End2020-05-04
Value0.0
Percentage of DerivativeNonmonetaryNotionalAmount0.0

mro:ThreeWayCollarsCrudeOil2020Q2, us-gaap:Nondesignated, us-gaap:SubsequentEvent



Period End2020-05-04
Value0.0
Percentage of DerivativeNonmonetaryNotionalAmount0.0

mro:ThreeWayCollarsCrudeOil2020Q3, us-gaap:Nondesignated, us-gaap:SubsequentEvent



Period End2020-05-04
Value80000.0
Percentage of DerivativeNonmonetaryNotionalAmount0.0

mro:ThreeWayCollarsCrudeOil2020Q4, us-gaap:Nondesignated, us-gaap:SubsequentEvent



Period End2020-05-04
Value80000.0
Percentage of DerivativeNonmonetaryNotionalAmount0.0

mro:ThreeWayCollarsCrudeOil2021, us-gaap:Nondesignated, us-gaap:SubsequentEvent



Period End2020-05-04
Value0.0
Percentage of DerivativeNonmonetaryNotionalAmount0.0

mro:ThreeWayCollarsNaturalGasQ12020, us-gaap:Nondesignated, us-gaap:SubsequentEvent



Period End2020-02-102019-11-05
Value20000.0100000.0
Percentage of DerivativeNonmonetaryNotionalAmount0.00.0

mro:TwoWayCollarsCrudeOil2020Q2, us-gaap:Nondesignated, us-gaap:SubsequentEvent



Period End2020-05-04
Value40000.0
Percentage of DerivativeNonmonetaryNotionalAmount0.0

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



Period End2020-05-04
Value0.0
Percentage of DerivativeNonmonetaryNotionalAmount0.0

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



Period End2020-05-04
Value0.0
Percentage of DerivativeNonmonetaryNotionalAmount0.0

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



Period End2020-05-04
Value0.0
Percentage of DerivativeNonmonetaryNotionalAmount0.0

us-gaap:DerivativeInstrumentRisk

us-gaap:DerivativeNotionalAmount

mro:InterestRateContractMaturingJune12025



Period End2020-03-31
Value100
Percentage of DerivativeNotionalAmount100.0

mro:InterestRateContractMaturingNovember12022



Period End2020-03-31
Value350
Percentage of DerivativeNotionalAmount350.0

us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship

us-gaap:InterestRateContract, us-gaap:CashFlowHedging



Period End2020-03-312019-12-312019-09-30
Value350320160
Percentage of DerivativeNotionalAmount350.00.00.0

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

us-gaap:InterestRateContract, mro:NotesDue2022, us-gaap:SubsequentEvent



Period End2020-05-04
Value150
Percentage of DerivativeNotionalAmount0.0

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



Period End2020-05-04
Value150
Percentage of DerivativeNotionalAmount0.0

us-gaap:EmployeeRelatedLiabilitiesCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-312009-12-312008-12-31
Value681129288761541271098510899927012912111479133138119127191149121180240162137182217148120165193129139359418362360399400
Percentage of EmployeeRelatedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EquityMethodInvestments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-312009-12-312008-12-31
Value6286636676847197457577888068478368219069319319449591003101210451100111311031184122312011216124413041279131913191353138314311475184618021844200419702080
Percentage of EquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

mro:AlbaPlantLlc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value162163158173169167170189199214215230225263264272303317
Percentage of EquityMethodInvestments25.824.623.725.323.522.422.524.024.725.323.122.920.221.920.619.716.816.1

mro:Ampco



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value172190185180182176185185181177165169194189187191210224
Percentage of EquityMethodInvestments27.428.727.726.325.323.624.423.522.520.917.716.817.415.714.613.811.711.4

mro:EgHoldings



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value294310324331368402402414426456550603693748817875927986
Percentage of EquityMethodInvestments46.846.848.648.451.254.053.152.552.953.859.160.162.362.363.963.351.450.1

us-gaap:FairValueByMeasurementBasis

us-gaap:FinancialLiabilitiesFairValueDisclosure

us-gaap:CarryingReportedAmountFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value57055705572857275697567456665669567356726687745074747474746874327429741984028404644264416557655465896587663566136749
Percentage of FinancialLiabilitiesFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value41246335620162336003559959065923597761186937760477117631751773326713685483868806706169697164723971867084711871457717
Percentage of FinancialLiabilitiesFairValueDisclosure72.3111.0108.3108.8105.498.7104.2104.5105.4107.9103.7102.1103.2102.1100.798.790.492.499.8104.8109.6108.2109.3110.5109.1107.5107.3108.0114.3

us-gaap:GuaranteeObligationsByNature

us-gaap:GuaranteeObligationsMaximumExposure

mro:PerformanceofAlbaPlantLLC.



Period End2020-03-31
Value25
Percentage of GuaranteeObligationsMaximumExposure100.0

mro:PerformanceofEquatorialGuineaLNGOperationsS.A.



Period End2020-03-31
Value91
Percentage of GuaranteeObligationsMaximumExposure364.0

us-gaap:LongTermDebtAndCapitalLeaseObligations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-312009-12-312008-12-31
Value550255014903490255015499549854975495549464886715572365897277728072807276732373215326532363556362639263946433642864766512451845134559467447054684799276017844844084367087
Percentage of LongTermDebtAndCapitalLeaseObligations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByMeasurementBasis

us-gaap:LongTermDebtFairValue

us-gaap:CarryingReportedAmountFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value55295529552955285528552855285528552755266527729372937292729272917291729183248324636163606394639464276427646164606642
Percentage of LongTermDebtFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value39926174601860485875546957775791584159766781745175357449734571866575672383028720698068877057713370206922694169917610
Percentage of LongTermDebtFairValue72.2111.7108.8109.4106.398.9104.5104.8105.7108.1103.9102.2103.3102.2100.798.690.292.299.7104.8109.7108.3110.4111.6109.2107.7107.4108.2114.6

us-gaap:FairValueByMeasurementBasis

us-gaap:OtherAssetsFairValueDisclosure

us-gaap:CarryingReportedAmountFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value44443131548157617547531070
Percentage of OtherAssetsFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value34444131548157627557531070
Percentage of OtherAssetsFairValueDisclosure75.0100.0100.0100.0133.3100.0100.0100.0100.0100.1100.1100.0100.0100.00.0

us-gaap:FairValueByMeasurementBasis

us-gaap:OtherLiabilitiesFairValueDisclosure

us-gaap:CarryingReportedAmountFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value81869698111889297103103105103106107117117105956467686815014714914716114094
Percentage of OtherLiabilitiesFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value90991081098693971001051101121101121141231211049769736869949315314916414194
Percentage of OtherLiabilitiesFairValueDisclosure111.1115.1112.5111.277.5105.7105.4103.1101.9106.8106.7106.8105.7106.5105.1103.499.0102.1107.8109.0100.0101.562.763.3102.7101.4101.9100.7100.0

us-gaap:PostemploymentBenefitsLiabilityNoncurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-312009-12-312008-12-31
Value172183174179179195286311331362330340365345400409446403436438515598611668660604713739850856817761747789667673219921711846207820561609
Percentage of PostemploymentBenefitsLiabilityNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PreferredStockSharesAuthorized



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-312009-12-312008-12-31
Value262626262626262626262626262626262626262626262626262626262626262626262626262626666
Percentage of PreferredStockSharesAuthorized100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PreferredStockSharesIssued



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-312009-12-312008-12-31
Value000000000000000000000000000000000000000555
Percentage of PreferredStockSharesIssued0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0100.0100.0100.0

us-gaap:PreferredStockSharesOutstanding



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-312009-12-312008-12-31
Value000000000000000000000000000000000000000113
Percentage of PreferredStockSharesOutstanding0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0100.0100.0100.0

us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber

mro:PerformanceUnit



Period End2020-03-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value11111000
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber100.0100.0100.0100.0100.0100.0100.0100.0

mro:RestrictedStockAwardsAndRestrictedStockUnits



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value97788887
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber572.7559.50.00.00.0711.00.0501.2

us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue

mro:RestrictedStockAwardsAndRestrictedStockUnits



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value11.7715.8816.016.016.0114.0414.0114.24
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:TreasuryStockShares



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-312009-12-312008-12-31
Value146141136133117118998384878787879090898993939395959597897374616263646565666656586060616161
Percentage of TreasuryStockShares100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Line plots across dimensions of each concept

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


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


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


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


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


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


us-gaap:StockholdersEquity us-gaap:StatementEquityComponents


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


us-gaap:StockholdersEquity us-gaap:StatementEquityComponents


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


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