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Fair Value Measurements (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Financial Assets:    
Financial Assets: Crude Oil Swaps $ 121,000,000us-gaap_DerivativeAssets  
Financial Assets: Crude Oil Options/Swaptions 244,000,000eog_FinancialAssetsCrudeOilOptions  
Financial Assets: Natural Gas Options/Swaptions 100,000,000eog_FinancialAssetsNaturalGasOptionsSwaptions 8,000,000eog_FinancialAssetsNaturalGasOptionsSwaptions
Financial Liabilities:    
Financial Liabilities: Crude Oil Swaps   17,000,000us-gaap_DerivativeLiabilities
Financial Liabilities: Crude Oil Options/Swaptions   110,000,000eog_FinancialLiabilitiesCrudeOilOptionsSwaptions
Financial Liabilities: Foreign Currency Rate Swap   40,000,000us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure
Financial Liabilities: Interest Rate Swap   1,000,000us-gaap_InterestRateDerivativeLiabilitiesAtFairValue
Proved and unproved oil and gas properties and other assets, carrying amount 968,000,000eog_ProvedOilAndGasPropertyCarryingAmount 400,000,000eog_ProvedOilAndGasPropertyCarryingAmount
Proved and unproved oil and gas properties and other assets written down during the period - fair value at end of period 393,000,000eog_ProvedOilAndGasPropertyFairValue 228,000,000eog_ProvedOilAndGasPropertyFairValue
Pretax impairment charges for proved oil and gas properties and other assets 575,000,000eog_ImpairmentChargeForProvedOilAndGasPropertiesAndOtherPropertyPlantAndEquipment 172,000,000eog_ImpairmentChargeForProvedOilAndGasPropertiesAndOtherPropertyPlantAndEquipment
Pretax impairment charges for proved oil and gas properties and other assets, in which EOG utilized an accepted offer from a third-party purchasers 58,000,000eog_ImpairmentChargeForShallowNaturalGasAssetsSoldInCanada 58,000,000eog_ImpairmentChargeForShallowNaturalGasAssetsSoldInCanada
Aggregate Principal Amount of Current and Long-Term Debt 5,890,000,000us-gaap_DebtInstrumentCarryingAmount 5,890,000,000us-gaap_DebtInstrumentCarryingAmount
Fair Value of Debt 6,242,000,000us-gaap_DebtInstrumentFairValue 6,222,000,000us-gaap_DebtInstrumentFairValue
Fair Value, Inputs, Level 1 [Member]    
Financial Assets:    
Financial Assets: Natural Gas Options/Swaptions 0eog_FinancialAssetsNaturalGasOptionsSwaptions
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
0eog_FinancialAssetsNaturalGasOptionsSwaptions
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Financial Liabilities:    
Financial Liabilities: Crude Oil Swaps 0us-gaap_DerivativeLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
0us-gaap_DerivativeLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Financial Liabilities: Crude Oil Options/Swaptions 0eog_FinancialLiabilitiesCrudeOilOptionsSwaptions
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
0eog_FinancialLiabilitiesCrudeOilOptionsSwaptions
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Financial Liabilities: Foreign Currency Rate Swap   0us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Financial Liabilities: Interest Rate Swap   0us-gaap_InterestRateDerivativeLiabilitiesAtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Fair Value, Inputs, Level 2 [Member]    
Financial Assets:    
Financial Assets: Crude Oil Swaps 121,000,000us-gaap_DerivativeAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
 
Financial Assets: Crude Oil Options/Swaptions 244,000,000eog_FinancialAssetsCrudeOilOptions
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
 
Financial Assets: Natural Gas Options/Swaptions 100,000,000eog_FinancialAssetsNaturalGasOptionsSwaptions
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
8,000,000eog_FinancialAssetsNaturalGasOptionsSwaptions
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Financial Liabilities:    
Financial Liabilities: Crude Oil Swaps   17,000,000us-gaap_DerivativeLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Financial Liabilities: Crude Oil Options/Swaptions   110,000,000eog_FinancialLiabilitiesCrudeOilOptionsSwaptions
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Financial Liabilities: Foreign Currency Rate Swap   40,000,000us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Financial Liabilities: Interest Rate Swap   1,000,000us-gaap_InterestRateDerivativeLiabilitiesAtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Fair Value, Inputs, Level 3 [Member]    
Financial Assets:    
Financial Assets: Natural Gas Options/Swaptions 0eog_FinancialAssetsNaturalGasOptionsSwaptions
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
0eog_FinancialAssetsNaturalGasOptionsSwaptions
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Financial Liabilities:    
Financial Liabilities: Crude Oil Swaps 0us-gaap_DerivativeLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
0us-gaap_DerivativeLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Financial Liabilities: Crude Oil Options/Swaptions 0eog_FinancialLiabilitiesCrudeOilOptionsSwaptions
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
0eog_FinancialLiabilitiesCrudeOilOptionsSwaptions
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Financial Liabilities: Foreign Currency Rate Swap   0us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Financial Liabilities: Interest Rate Swap   $ 0us-gaap_InterestRateDerivativeLiabilitiesAtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member