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Consolidated Statements of Cash Flows (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Statement of Cash Flows [Abstract]      
Net income $ 3,046us-gaap_NetIncomeLoss $ 1,753us-gaap_NetIncomeLoss $ 1,582us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:      
Discontinued operations (2,077)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax (822)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax (726)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Deferred income taxes 88us-gaap_DeferredIncomeTaxExpenseBenefit (34)us-gaap_DeferredIncomeTaxExpenseBenefit (34)us-gaap_DeferredIncomeTaxExpenseBenefit
Depreciation, depletion and amortization 2,861us-gaap_DepreciationDepletionAndAmortization 2,500us-gaap_DepreciationDepletionAndAmortization 2,008us-gaap_DepreciationDepletionAndAmortization
Impairments 132us-gaap_ImpairmentOfOilAndGasProperties 96us-gaap_ImpairmentOfOilAndGasProperties 371us-gaap_ImpairmentOfOilAndGasProperties
Pension and other postretirement benefits, net (34)us-gaap_IncreaseDecreaseInPensionAndPostretirementObligations 45us-gaap_IncreaseDecreaseInPensionAndPostretirementObligations (32)us-gaap_IncreaseDecreaseInPensionAndPostretirementObligations
Exploratory dry well costs and unproved property impairments 623us-gaap_ExplorationAbandonmentAndImpairmentExpense 720us-gaap_ExplorationAbandonmentAndImpairmentExpense 457us-gaap_ExplorationAbandonmentAndImpairmentExpense
Net (gain) loss on disposal of assets 90mro_GainLossOnDisposalOfAssets 29mro_GainLossOnDisposalOfAssets (127)mro_GainLossOnDisposalOfAssets
Equity method investments, net 27us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions 12us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions 11us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions
Changes in:      
Current receivables 119us-gaap_IncreaseDecreaseInReceivables 217us-gaap_IncreaseDecreaseInReceivables (481)us-gaap_IncreaseDecreaseInReceivables
Inventories (11)us-gaap_IncreaseDecreaseInInventories (19)us-gaap_IncreaseDecreaseInInventories (24)us-gaap_IncreaseDecreaseInInventories
Current accounts payable and accrued liabilities (33)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities (208)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities (102)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
All other operating, net (95)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet 99us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet (29)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
Net cash provided by continuing operations 4,736us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 4,388us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 2,874us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Net cash provided by discontinued operations 751us-gaap_NetCashProvidedByUsedInDiscontinuedOperations 882us-gaap_NetCashProvidedByUsedInDiscontinuedOperations 1,143us-gaap_NetCashProvidedByUsedInDiscontinuedOperations
Net cash provided by operating activities 5,487us-gaap_NetCashProvidedByUsedInOperatingActivities 5,270us-gaap_NetCashProvidedByUsedInOperatingActivities 4,017us-gaap_NetCashProvidedByUsedInOperatingActivities
Investing activities:      
Acquisitions, net of cash acquired (21)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired (74)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired (1,033)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Additions to property, plant and equipment (5,160)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (4,443)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (4,361)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Disposal of assets, net of cash transferred to buyer 3,760us-gaap_ProceedsFromSaleOfOilAndGasPropertyAndEquipment 450us-gaap_ProceedsFromSaleOfOilAndGasPropertyAndEquipment 467us-gaap_ProceedsFromSaleOfOilAndGasPropertyAndEquipment
Investments - return of capital 61mro_InvestmentsRepaymentsOfLoansAndReturnOfCapital 61mro_InvestmentsRepaymentsOfLoansAndReturnOfCapital 57mro_InvestmentsRepaymentsOfLoansAndReturnOfCapital
Investing activities of discontinued operations (376)us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations (550)us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations (579)us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations
All other investing, net (10)us-gaap_PaymentsForProceedsFromOtherInvestingActivities 35us-gaap_PaymentsForProceedsFromOtherInvestingActivities 10us-gaap_PaymentsForProceedsFromOtherInvestingActivities
Net cash used in investing activities (1,746)us-gaap_NetCashProvidedByUsedInInvestingActivities (4,521)us-gaap_NetCashProvidedByUsedInInvestingActivities (5,439)us-gaap_NetCashProvidedByUsedInInvestingActivities
Financing activities:      
Commercial paper, net (135)us-gaap_ProceedsFromRepaymentsOfCommercialPaper (65)us-gaap_ProceedsFromRepaymentsOfCommercialPaper 200us-gaap_ProceedsFromRepaymentsOfCommercialPaper
Borrowings 0us-gaap_ProceedsFromIssuanceOfLongTermDebt 0us-gaap_ProceedsFromIssuanceOfLongTermDebt 1,997us-gaap_ProceedsFromIssuanceOfLongTermDebt
Debt issuance costs 0us-gaap_PaymentsOfDebtIssuanceCosts 0us-gaap_PaymentsOfDebtIssuanceCosts (21)us-gaap_PaymentsOfDebtIssuanceCosts
Debt repayments (68)us-gaap_RepaymentsOfLongTermDebt (182)us-gaap_RepaymentsOfLongTermDebt (145)us-gaap_RepaymentsOfLongTermDebt
Purchases of common stock (1,000)us-gaap_PaymentsForRepurchaseOfCommonStock (500)us-gaap_PaymentsForRepurchaseOfCommonStock 0us-gaap_PaymentsForRepurchaseOfCommonStock
Dividends paid (543)us-gaap_PaymentsOfDividends (508)us-gaap_PaymentsOfDividends (480)us-gaap_PaymentsOfDividends
All other financing, net 153us-gaap_ProceedsFromPaymentsForOtherFinancingActivities 93us-gaap_ProceedsFromPaymentsForOtherFinancingActivities 49us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
Net cash provided by (used in) financing activities (1,593)us-gaap_NetCashProvidedByUsedInFinancingActivities (1,162)us-gaap_NetCashProvidedByUsedInFinancingActivities 1,600us-gaap_NetCashProvidedByUsedInFinancingActivities
Effect of Exchange Rate on Cash and Cash Equivalents, Continuing Operations (2)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations (3)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations 7us-gaap_EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations
Effect of Exchange Rate on Cash and Cash Equivalents, Discontinued Operations (12)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalentsDiscontinuedOperations (4)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalentsDiscontinuedOperations 6us-gaap_EffectOfExchangeRateOnCashAndCashEquivalentsDiscontinuedOperations
Net increase (decrease) in cash and cash equivalents 2,134us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (420)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 191us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of period 264us-gaap_CashAndCashEquivalentsAtCarryingValue 684us-gaap_CashAndCashEquivalentsAtCarryingValue 493us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of period $ 2,398us-gaap_CashAndCashEquivalentsAtCarryingValue $ 264us-gaap_CashAndCashEquivalentsAtCarryingValue $ 684us-gaap_CashAndCashEquivalentsAtCarryingValue