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Accumulated Other Comprehensive Income Accumulated Other Comprehensive Income (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other Comprehensive Income (Loss) $ (438,890,000)us-gaap_OtherComprehensiveIncomeLossNetOfTax $ (24,061,000)us-gaap_OtherComprehensiveIncomeLossNetOfTax $ 38,149,000us-gaap_OtherComprehensiveIncomeLossNetOfTax
Accumulated Other Comprehensive Income (Loss) (23,056,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 415,834,000us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax  
Significant amounts reclassified out of AOCI   0eog_SignificantamountsreclassifiedoutofAOCI 0eog_SignificantamountsreclassifiedoutofAOCI
Foreign Currency Translation Adjustment [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated Other Comprehensive Income (Loss), before Tax   417,707,000us-gaap_AccumulatedOtherComprehensiveIncomeLossBeforeTax1
/ us-gaap_StatementEquityComponentsAxis
= eog_ForeignCurrencyTranslationAdjustmentMember		  
Other Comprehensive Loss, before Reclassifications, before Tax (54,484,000)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax
/ us-gaap_StatementEquityComponentsAxis
= eog_ForeignCurrencyTranslationAdjustmentMember		    
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax (383,244,000)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax
/ us-gaap_StatementEquityComponentsAxis
= eog_ForeignCurrencyTranslationAdjustmentMember		 [1]    
Tax Effects 0eog_TaxEfffects
/ us-gaap_StatementEquityComponentsAxis
= eog_ForeignCurrencyTranslationAdjustmentMember		    
Other Comprehensive Income (Loss) (437,728,000)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= eog_ForeignCurrencyTranslationAdjustmentMember		    
Accumulated Other Comprehensive Income (Loss) (20,021,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= eog_ForeignCurrencyTranslationAdjustmentMember		    
Foreign Currency Swap [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated Other Comprehensive Income (Loss), before Tax   620,000us-gaap_AccumulatedOtherComprehensiveIncomeLossBeforeTax1
/ us-gaap_StatementEquityComponentsAxis
= eog_ForeignCurrencySwapMember		  
Other Comprehensive Loss, before Reclassifications, before Tax 0us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax
/ us-gaap_StatementEquityComponentsAxis
= eog_ForeignCurrencySwapMember		    
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax (670,000)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax
/ us-gaap_StatementEquityComponentsAxis
= eog_ForeignCurrencySwapMember		 [2]    
Tax Effects 50,000eog_TaxEfffects
/ us-gaap_StatementEquityComponentsAxis
= eog_ForeignCurrencySwapMember		    
Other Comprehensive Income (Loss) (620,000)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= eog_ForeignCurrencySwapMember		    
Accumulated Other Comprehensive Income (Loss) 0us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= eog_ForeignCurrencySwapMember		    
Interest Rate Swap [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated Other Comprehensive Income (Loss), before Tax   (496,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossBeforeTax1
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_InterestRateSwapMember		  
Other Comprehensive Loss, before Reclassifications, before Tax 0us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_InterestRateSwapMember		    
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 777,000us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_InterestRateSwapMember		    
Tax Effects (281,000)eog_TaxEfffects
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_InterestRateSwapMember		    
Other Comprehensive Income (Loss) 496,000us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_InterestRateSwapMember		    
Accumulated Other Comprehensive Income (Loss) 0us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_InterestRateSwapMember		    
Other [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated Other Comprehensive Income (Loss), before Tax   (1,997,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossBeforeTax1
/ us-gaap_StatementEquityComponentsAxis
= eog_OtherPensionandPostRetirementMember		  
Other Comprehensive Loss, before Reclassifications, before Tax (918,000)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax
/ us-gaap_StatementEquityComponentsAxis
= eog_OtherPensionandPostRetirementMember		    
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 139,000us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax
/ us-gaap_StatementEquityComponentsAxis
= eog_OtherPensionandPostRetirementMember		 [3]    
Tax Effects (259,000)eog_TaxEfffects
/ us-gaap_StatementEquityComponentsAxis
= eog_OtherPensionandPostRetirementMember		    
Other Comprehensive Income (Loss) (1,038,000)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= eog_OtherPensionandPostRetirementMember		    
Accumulated Other Comprehensive Income (Loss) (3,035,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= eog_OtherPensionandPostRetirementMember		    
Accumulated Other Comprehensive Income (Loss) [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated Other Comprehensive Income (Loss), before Tax   415,834,000us-gaap_AccumulatedOtherComprehensiveIncomeLossBeforeTax1
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		  
Other Comprehensive Loss, before Reclassifications, before Tax (55,402,000)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		    
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax (382,998,000)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		    
Tax Effects (490,000)eog_TaxEfffects
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		    
Other Comprehensive Income (Loss) (438,890,000)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		 (24,061,000)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		 38,149,000us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
Accumulated Other Comprehensive Income (Loss) $ (23,056,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		    
[1] Reclassified to Net Income - Gain on Asset Dispositions, Net. See Note 17.
[2] Reclassified to Net Income - Interest Expense Incurred. See Note 2.
[3] Related to certain EOG pension plans. See Note 7.