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Other Items (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Net Interest and Other Financing [Abstract]      
Interest income $ 7us-gaap_InvestmentIncomeInterest $ 5us-gaap_InvestmentIncomeInterest $ 12us-gaap_InvestmentIncomeInterest
Interest expense(a) (297)us-gaap_InterestExpenseDebt (299)us-gaap_InterestExpenseDebt (241)us-gaap_InterestExpenseDebt
Income on interest rate swaps 12mro_IncomeLossOnInterestRateSwaps 9mro_IncomeLossOnInterestRateSwaps 7mro_IncomeLossOnInterestRateSwaps
Interest capitalized 20us-gaap_InterestCostsCapitalizedAdjustment 12us-gaap_InterestCostsCapitalizedAdjustment 9us-gaap_InterestCostsCapitalizedAdjustment
Total interest (258)us-gaap_InterestIncomeExpenseNet (273)us-gaap_InterestIncomeExpenseNet (213)us-gaap_InterestIncomeExpenseNet
Net foreign currency gains (losses) 21us-gaap_ForeignCurrencyTransactionGainLossBeforeTax 14us-gaap_ForeignCurrencyTransactionGainLossBeforeTax 2us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
Write off of contingent proceeds 0us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationAsset1 (4)us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationAsset1 0us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationAsset1
Other (1)us-gaap_OtherNonoperatingExpense (15)us-gaap_OtherNonoperatingExpense (11)us-gaap_OtherNonoperatingExpense
Total other 20us-gaap_OtherNonoperatingIncomeExpense (5)us-gaap_OtherNonoperatingIncomeExpense (9)us-gaap_OtherNonoperatingIncomeExpense
Net interest and other (238)mro_NetInterestAndOther (278)mro_NetInterestAndOther (222)mro_NetInterestAndOther
Aggregate foreign currency gains losses [Abstract]      
Net interest and other 21us-gaap_ForeignCurrencyTransactionGainLossBeforeTax 14us-gaap_ForeignCurrencyTransactionGainLossBeforeTax 2us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
Provision for income taxes (12)mro_ProvisionForIncomeTaxesForeignCurrencyTransactionGainLoss (2)mro_ProvisionForIncomeTaxesForeignCurrencyTransactionGainLoss 2mro_ProvisionForIncomeTaxesForeignCurrencyTransactionGainLoss
Aggregate foreign currency gains (losses) $ 9mro_AggregateForeignCurrencyGainsLosses $ 12mro_AggregateForeignCurrencyGainsLosses $ 4mro_AggregateForeignCurrencyGainsLosses