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Stock-Based Compensation (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Stock based compensation by job function [Line Items]    
Compensation expense related to the company's stock-based compensation plans $ 33.1us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue $ 35.6us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
Stock Options/SARs and Employee Stock Purchase Plan (ESPP) Disclosures [Line Items]    
Stock-based compensation expense related to stock options, SAR and ESPP grants 11.6us-gaap_AllocatedShareBasedCompensationExpense 12.0us-gaap_AllocatedShareBasedCompensationExpense
Share-Based Compensation Arrangement By Share Based Payment Award Stock Option/SARs, ESPP, Restricted Stock/Units and Performance Units/Stock [Abstract]    
Unrecognized compensation expense 98.4us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized  
Weighted average period over which unrecognized compensation expense will be recognized (in years) 2 years 6 months  
Performance Units and Performance Stock [Abstract]    
Common Shares Available for Grant 27,900,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant  
Stock Options and SARs [Member]    
Weighted Average Fair Values And Valuation Assumptions Used To Value Stock Option/SARs, ESPP, and Performance Units/Stock Stock-Based Compensation [Abstract]    
Weighted Average Fair Value of Grants (price per share) $ 30.35us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= eog_StockOptionsAndSarsMember		 $ 26.11us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= eog_StockOptionsAndSarsMember
Expected Volatility (in hundredths) 40.01%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= eog_StockOptionsAndSarsMember		 35.89%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= eog_StockOptionsAndSarsMember
Risk-Free Interest Rate (in hundredths) 0.82%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= eog_StockOptionsAndSarsMember		 0.84%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= eog_StockOptionsAndSarsMember
Dividend Yield (in hundredths) 0.73%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= eog_StockOptionsAndSarsMember		 0.48%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= eog_StockOptionsAndSarsMember
Expected Life (in years) 5 years 3 months 18 days 5 years 3 months 18 days
Stock Options and SARs Rollforward [Abstract]    
Outstanding at January 1 (in shares) 10,493,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= eog_StockOptionsAndSarsMember		 10,452,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= eog_StockOptionsAndSarsMember
Granted (in shares) 30,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= eog_StockOptionsAndSarsMember		 40,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= eog_StockOptionsAndSarsMember
Exercised (1) (in shares) (459,000)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_AwardTypeAxis
= eog_StockOptionsAndSarsMember		 [1] (353,000)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_AwardTypeAxis
= eog_StockOptionsAndSarsMember		 [1]
Forfeited (in shares) (96,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
/ us-gaap_AwardTypeAxis
= eog_StockOptionsAndSarsMember		 (66,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
/ us-gaap_AwardTypeAxis
= eog_StockOptionsAndSarsMember
Outstanding at March 31 (2) (in shares) 9,968,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= eog_StockOptionsAndSarsMember		 [2] 10,073,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= eog_StockOptionsAndSarsMember		 [2]
Share-Based Compensation Arrangement By Share Based Payment Award Stock Option/SARs, ESPP, Restricted Stock/Units and Performance Units/Stock [Abstract]    
Outstanding at January 1 (price per share) $ 64.96us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= eog_StockOptionsAndSarsMember		 $ 54.43us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= eog_StockOptionsAndSarsMember
Granted (price per share) $ 91.85us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= eog_StockOptionsAndSarsMember		 $ 84.74us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= eog_StockOptionsAndSarsMember
Exercised (1) (price per share) $ 47.25us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= eog_StockOptionsAndSarsMember		 [1] $ 44.40us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= eog_StockOptionsAndSarsMember		 [1]
Forfeited (price per share) $ 77.96us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= eog_StockOptionsAndSarsMember		 $ 61.56us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= eog_StockOptionsAndSarsMember
Outstanding at March 31 (2) (price per share) $ 65.73us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= eog_StockOptionsAndSarsMember		 [2] $ 54.85us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= eog_StockOptionsAndSarsMember		 [2]
Stock Options and SARs Vested or Expected to Vest (in shares) 9,586,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber
/ us-gaap_AwardTypeAxis
= eog_StockOptionsAndSarsMember		 [3] 9,619,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber
/ us-gaap_AwardTypeAxis
= eog_StockOptionsAndSarsMember		 [3]
Weighted average grant price for stock options/SARs vested or expected to vest (price per share) $ 65.09us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= eog_StockOptionsAndSarsMember		 [3] $ 54.44us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= eog_StockOptionsAndSarsMember		 [3]
Stock Options and SARs Exercisable at March 31 (in shares) 4,882,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_AwardTypeAxis
= eog_StockOptionsAndSarsMember		 [4] 4,314,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_AwardTypeAxis
= eog_StockOptionsAndSarsMember		 [4]
Stock Options and SARs Exercisable at March 31 (price per share) $ 49.85us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= eog_StockOptionsAndSarsMember		 [4] $ 44.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= eog_StockOptionsAndSarsMember		 [4]
Intrinsic value of stock options/SARs exercised during the period 20.1us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
/ us-gaap_AwardTypeAxis
= eog_StockOptionsAndSarsMember		 16.2us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
/ us-gaap_AwardTypeAxis
= eog_StockOptionsAndSarsMember
Aggregate intrinsic value for outstanding stock options and SARs 279.5us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_AwardTypeAxis
= eog_StockOptionsAndSarsMember		 435.5us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_AwardTypeAxis
= eog_StockOptionsAndSarsMember
Weighted average remaining contractual life for stock options/SARs outstanding (in years) 4 years 2 months 12 days 4 years 4 months 24 days
Aggregate intrinsic value of stock options/SARs vested or expected to vest 274.1us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue
/ us-gaap_AwardTypeAxis
= eog_StockOptionsAndSarsMember		 419.8us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue
/ us-gaap_AwardTypeAxis
= eog_StockOptionsAndSarsMember
Weighted average remaining contractual life for stock options/SARs vested or expected to vest (in years) 4 years 1 month 6 days 4 years 3 months 18 days
Aggregate intrinsic value for exercisable units 204.5us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
/ us-gaap_AwardTypeAxis
= eog_StockOptionsAndSarsMember		 233.3us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
/ us-gaap_AwardTypeAxis
= eog_StockOptionsAndSarsMember
Weighted average remaining contractual life for exercisable options/SARs (in years) 2 years 9 months 18 days 3 years
Weighted average period over which unrecognized compensation expense will be recognized (in years) 2 years 7 months 6 days  
ESPP [Member]    
Weighted Average Fair Values And Valuation Assumptions Used To Value Stock Option/SARs, ESPP, and Performance Units/Stock Stock-Based Compensation [Abstract]    
Weighted Average Fair Value of Grants (price per share) $ 23.39us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= eog_EsppMember		 $ 18.30us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= eog_EsppMember
Expected Volatility (in hundredths) 37.47%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= eog_EsppMember		 25.83%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= eog_EsppMember
Risk-Free Interest Rate (in hundredths) 0.11%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= eog_EsppMember		 0.09%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= eog_EsppMember
Dividend Yield (in hundredths) 0.72%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= eog_EsppMember		 0.44%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= eog_EsppMember
Expected Life (in years) 6 months 6 months
Restricted Stock and Restricted Stock Units [Member]    
Share-Based Compensation Arrangement By Share Based Payment Award Stock Option/SARs, ESPP, Restricted Stock/Units and Performance Units/Stock [Abstract]    
Unrecognized compensation expense 190.7us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= eog_RestrictedStockAndRestrictedStockUnitsMember		  
Weighted average period over which unrecognized compensation expense will be recognized (in years) 3 years 7 months 6 days  
Share-Based Compensation Arrangement By Restricted Stock And Restricted Stock Units Compensation Cost 21.2us-gaap_RestrictedStockExpense
/ us-gaap_AwardTypeAxis
= eog_RestrictedStockAndRestrictedStockUnitsMember		 22.7us-gaap_RestrictedStockExpense
/ us-gaap_AwardTypeAxis
= eog_RestrictedStockAndRestrictedStockUnitsMember
Restricted Stock/Restricted Stock Units and Performance Units/Performance Stock [Roll Forward]    
Outstanding at January 1 (in shares) 5,394,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= eog_RestrictedStockAndRestrictedStockUnitsMember		 7,358,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= eog_RestrictedStockAndRestrictedStockUnitsMember
Granted (in shares) 438,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= eog_RestrictedStockAndRestrictedStockUnitsMember		 384,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= eog_RestrictedStockAndRestrictedStockUnitsMember
Released (in shares) (365,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= eog_RestrictedStockAndRestrictedStockUnitsMember		 [5] (838,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= eog_RestrictedStockAndRestrictedStockUnitsMember		 [5]
Forfeited (in shares) (44,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= eog_RestrictedStockAndRestrictedStockUnitsMember		 (55,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= eog_RestrictedStockAndRestrictedStockUnitsMember
Outstanding at March 31 (1) (in shares) 5,423,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= eog_RestrictedStockAndRestrictedStockUnitsMember		 [6] 6,849,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= eog_RestrictedStockAndRestrictedStockUnitsMember		 [6]
Weighted Average Grant Price Restricted Stock and Restricted Stock Units/Performance Units and Performance Stock [Roll Forward]    
Outstanding at January 1 (price per share) $ 64.39us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= eog_RestrictedStockAndRestrictedStockUnitsMember		 $ 49.54us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= eog_RestrictedStockAndRestrictedStockUnitsMember
Granted (price per share) $ 87.93us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= eog_RestrictedStockAndRestrictedStockUnitsMember		 $ 94.01us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= eog_RestrictedStockAndRestrictedStockUnitsMember
Released (price per share) $ 51.22us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= eog_RestrictedStockAndRestrictedStockUnitsMember		 [5] $ 24.47us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= eog_RestrictedStockAndRestrictedStockUnitsMember		 [5]
Forfeited (price per share) $ 76.19us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= eog_RestrictedStockAndRestrictedStockUnitsMember		 $ 57.73us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= eog_RestrictedStockAndRestrictedStockUnitsMember
Outstanding at March 31 (1) (price per share) $ 67.08us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= eog_RestrictedStockAndRestrictedStockUnitsMember		 [6] $ 55.04us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= eog_RestrictedStockAndRestrictedStockUnitsMember		 [6]
Intrinsic value of restricted stock and restricted stock units released during the year 32.8us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested
/ us-gaap_AwardTypeAxis
= eog_RestrictedStockAndRestrictedStockUnitsMember		 79.0us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested
/ us-gaap_AwardTypeAxis
= eog_RestrictedStockAndRestrictedStockUnitsMember
Aggregate intrinsic value of stock and units outstanding 497.3us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested
/ us-gaap_AwardTypeAxis
= eog_RestrictedStockAndRestrictedStockUnitsMember		 671.8us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested
/ us-gaap_AwardTypeAxis
= eog_RestrictedStockAndRestrictedStockUnitsMember
Performance Units and Performance Stock [Member]    
Share-Based Compensation Arrangement By Share Based Payment Award Stock Option/SARs, ESPP, Restricted Stock/Units and Performance Units/Stock [Abstract]    
Unrecognized compensation expense 5.1us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		  
Restricted Stock/Restricted Stock Units and Performance Units/Performance Stock [Roll Forward]    
Outstanding at January 1 (in shares) 333,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		 261,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
Granted (in shares) 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
Released (in shares) 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
Forfeited (in shares) 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
Outstanding at March 31 (1) (in shares) 333,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		 [7] 261,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		 [7]
Weighted Average Grant Price Restricted Stock and Restricted Stock Units/Performance Units and Performance Stock [Roll Forward]    
Outstanding at January 1 (price per share) $ 90.17us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		 $ 82.18us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
Granted (price per share) $ 0.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		 $ 0.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
Released (price per share) $ 0.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		 $ 0.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
Forfeited (price per share) $ 0.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		 $ 0.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
Outstanding at March 31 (1) (price per share) $ 90.17us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		 [7] $ 82.18us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		 [7]
Aggregate intrinsic value of stock and units outstanding 30.6us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		 21.9us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
Performance Units and Performance Stock [Abstract]    
Share-Based Compensation Arrangement By Performance Units and Performance Stock Compensation Cost 0.3eog_ShareBasedCompensationArrangementByPerformanceUnitsAndStockCompensationCost
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		 0.9eog_ShareBasedCompensationArrangementByPerformanceUnitsAndStockCompensationCost
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
Lease And Well [Member]    
Stock based compensation by job function [Line Items]    
Compensation expense related to the company's stock-based compensation plans 12.1us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_IncomeStatementLocationAxis
= eog_LeaseAndWellMember		 11.6us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_IncomeStatementLocationAxis
= eog_LeaseAndWellMember
Gathering And Processing Costs [Member]    
Stock based compensation by job function [Line Items]    
Compensation expense related to the company's stock-based compensation plans 0.3us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_IncomeStatementLocationAxis
= eog_GatheringAndProcessingCostsMember		 0.3us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_IncomeStatementLocationAxis
= eog_GatheringAndProcessingCostsMember
Exploration Costs [Member]    
Stock based compensation by job function [Line Items]    
Compensation expense related to the company's stock-based compensation plans 7.4us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_IncomeStatementLocationAxis
= eog_ExplorationCostsMember		 7.9us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_IncomeStatementLocationAxis
= eog_ExplorationCostsMember
General And Administrative [Member]    
Stock based compensation by job function [Line Items]    
Compensation expense related to the company's stock-based compensation plans $ 13.3us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_IncomeStatementLocationAxis
= eog_GeneralAndAdministrativeMember		 $ 15.8us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_IncomeStatementLocationAxis
= eog_GeneralAndAdministrativeMember
[1] The total intrinsic value of stock options/SARs exercised for the three months ended March 31, 2015 and 2014 was $20.1 million and $16.2 million, respectively. The intrinsic value is based upon the difference between the market price of EOG's common stock on the date of exercise and the grant price of the stock options/SARs.
[2] The total intrinsic value of stock options/SARs outstanding at March 31, 2015 and 2014 was $279.5 million and $435.5 million, respectively. At March 31, 2015 and 2014, the weighted average remaining contractual life was 4.2 years and 4.4 years, respectively.
[3] The total intrinsic value of stock options/SARs vested or expected to vest at March 31, 2015 and 2014 was $274.1 million and $419.8 million, respectively. At March 31, 2015 and 2014, the weighted average remaining contractual life was 4.1 years and 4.3 years, respectively.
[4] The total intrinsic value of stock options/SARs exercisable at March 31, 2015 and 2014 was $204.5 million and $233.3 million, respectively. At March 31, 2015 and 2014, the weighted average remaining contractual life was 2.8 years and 3.0 years, respectively.
[5] The total intrinsic value of restricted stock and restricted stock units released for the three months ended March 31, 2015 and 2014 was $32.8 million and $79.0 million, respectively. The intrinsic value is based upon the closing price of EOG's common stock on the date the restricted stock and restricted stock units are released.
[6] The total intrinsic value of restricted stock and restricted stock units outstanding at March 31, 2015 and 2014 was $497.3 million and $671.8 million, respectively.
[7] The total intrinsic value of performance units and performance stock outstanding at March 31, 2015 and 2014 was $30.6 million and $21.9 million, respectively.