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Risk Management Activities (Tables)
 12 Months Ended
Dec. 31, 2020
Price Risk Derivative [Member]  
Derivatives, Fair Value [Line Items]  
Schedule of Derivative Instruments In Statement Of Financial Position, Fair Value The following table sets forth the amounts and classification of EOG's outstanding derivative financial instruments at December 31, 2020 and 2019, respectively.  Certain amounts may be presented on a net basis on the consolidated financial statements when such amounts are with the same counterparty and subject to a master netting arrangement (in thousands):
   Fair Value at December 31,
DescriptionLocation on Balance Sheet20202019
Asset Derivatives 
Crude oil, NGLs and natural gas derivative contracts -
 
Current portion
Assets from Price Risk Management Activities (1)
$64,559 $1,299 
Noncurrent portionOther Assets1,063 — 
Liability Derivatives   
Crude oil, NGLs and natural gas derivative contracts -
   
Current portion
Liabilities from Price Risk Management Activities (2)
$— $20,194 
Noncurrent PortionOther Liabilities455 — 
(1)    The current portion of Assets from Price Risk Management Activities consists of gross assets of $3 million, partially offset by gross liabilities of $2 million, at December 31, 2019.
(2)    The current portion of Liabilities from Price Risk Management Activities consists of gross liabilities of $23 million, partially offset by gross assets of $3 million at December 31, 2019.
Crude Oil | Roll Differential Swap  
Derivatives, Fair Value [Line Items]  
Schedule of Derivative Instruments
EOG has also entered into crude oil swaps in order to fix the differential in pricing between the NYMEX calendar month average and the physical crude oil delivery month (Roll Differential). Presented below is a comprehensive summary of EOG's Roll Differential basis swap contracts as of December 31, 2020. The weighted average price differential expressed in $/Bbl represents the amount of net addition (reduction) to delivery month prices for the notional volumes expressed in Bbld covered by the swap contracts.

Roll Differential Basis Swap Contracts
 Volume (Bbld)Weighted Average Price Differential
($/Bbl)
2020
February 1, 2020 through June 30, 2020 (closed)10,000 $0.70 
July 1, 2020 through September 30, 2020 (closed)88,000 (1.16)
October 1, 2020 through December 31, 2020 (closed)66,000 (1.16)
2021
February 1, 2021 through December 31, 202125,000 $0.10 
2022
January 1, 2022 through December 31, 202250,000 $0.11 

In May 2020, EOG entered into crude oil Roll Differential basis swap contracts for the period from July 1, 2020 through September 30, 2020, with notional volumes of 22,000 Bbld at a weighted average price differential of $(0.43) per Bbl, and for the period from October 1, 2020 through December 31, 2020, with notional volumes of 44,000 Bbld at a weighted average price differential of $(0.73) per Bbl. These contracts partially offset certain outstanding Roll Differential basis swap contracts for the same time periods and volumes at a weighted average price differential of $(1.16) per Bbl. EOG paid net cash of $3.2 million for the settlement of these contracts. The offsetting contracts were excluded from the above table.
Crude Oil | Houston Differential Basis Swap  
Derivatives, Fair Value [Line Items]  
Schedule of Derivative Instruments
EOG has also entered into crude oil basis swap contracts in order to fix the differential between pricing in Houston, Texas, and Cushing, Oklahoma (Houston Differential). Presented below is a comprehensive summary of EOG's Houston Differential basis swap contracts as of December 31, 2020. The weighted average price differential expressed in $/Bbl represents the amount of addition to Cushing, Oklahoma, prices for the notional volumes expressed in Bbld covered by the basis swap contracts.
Houston Differential Basis Swap Contracts
 Volume (Bbld)Weighted Average Price Differential
($/Bbl)
2020
May 2020 (closed)10,000 $1.55 
Crude Oil | ICE Brent Differential Basis Swap  
Derivatives, Fair Value [Line Items]  
Schedule of Derivative Instruments EOG has entered into crude oil basis swap contracts in order to fix the differential between Intercontinental Exchange (ICE) Brent pricing and pricing in Cushing, Oklahoma (ICE Brent Differential). Presented below is a comprehensive summary of EOG's ICE Brent Differential basis swap contracts as of December 31, 2020. The weighted average price differential expressed in dollars per barrel ($/Bbl) represents the amount of addition to Cushing, Oklahoma, prices for the notional volumes expressed in barrels per day (Bbld) covered by the basis swap contracts.
ICE Brent Differential Basis Swap Contracts
 Volume (Bbld)Weighted Average Price Differential
($/Bbl)
2020
May 2020 (closed)10,000 $4.92 
Crude Oil | Price Swaps  
Derivatives, Fair Value [Line Items]  
Schedule of Derivative Instruments
Presented below is a comprehensive summary of EOG's crude oil NYMEX WTI price swap contracts as of December 31, 2020, with notional volumes expressed in Bbld and prices expressed in $/Bbl.
Crude Oil NYMEX WTI Price Swap Contracts
 Volume (Bbld)Weighted Average Price ($/Bbl)
2020
January 1, 2020 through March 31, 2020 (closed)200,000 $59.33 
April 1, 2020 through May 31, 2020 (closed)265,000 51.36 

In April and May 2020, EOG entered into crude oil NYMEX WTI price swap contracts for the period from June 1, 2020 through June 30, 2020, with notional volumes of 265,000 Bbld at a weighted average price of $33.80 per Bbl, for the period from July 1, 2020 through July 31, 2020, with notional volumes of 254,000 Bbld at a weighted average price of $33.75 per Bbl, for the period from August 1, 2020 through September 30, 2020, with notional volumes of 154,000 Bbld at a weighted average price of $34.18 per Bbl and for the period from October 1, 2020 through December 31, 2020, with notional volumes of 47,000 Bbld at a weighted average price of $30.04 per Bbl. These contracts offset the remaining crude oil NYMEX WTI price swap contracts for the same time periods and volumes at a weighted average price of $51.36 per Bbl for the period from June 1, 2020 through June 30, 2020, $42.36 per Bbl for the period from July 1, 2020 through July 31, 2020, $50.42 per Bbl for the period from August 1, 2020 through September 30, 2020 and $31.00 per Bbl for the period from October 1, 2020 through December 31, 2020. EOG received net cash of $362.6 million through December 31, 2020, for the settlement of certain of these contracts, and expects to receive net cash of $1.4 million during January 2021 for the settlement of the remaining contracts. The offsetting contracts were excluded from the above table.
Crude Oil | ICE Brent Price Swap  
Derivatives, Fair Value [Line Items]  
Schedule of Derivative Instruments
Presented below is a comprehensive summary of EOG's crude oil ICE Brent price swap contracts as of December 31, 2020, with notional volumes expressed in Bbld and prices expressed in $/Bbl.

Crude Oil ICE Brent Price Swap Contracts
 Volume (Bbld)Weighted Average Price ($/Bbl)
2020
April 2020 (closed)75,000 $25.66 
May 2020 (closed)35,000 26.53 
Natural Gas Liquids | Mont Belvieu Propane Price Swap  
Derivatives, Fair Value [Line Items]  
Schedule of Derivative Instruments Presented below is a comprehensive summary of EOG's Mont Belvieu propane (non-TET) price swap contracts as of December 31, 2020, with notional volumes expressed in Bbld and prices expressed in $/Bbl.
Mont Belvieu Propane Price Swap Contracts
 Volume (Bbld)Weighted Average Price ($/Bbl)
2020
January 1, 2020 through February 29, 2020 (closed)4,000 $21.34 
March 1, 2020 through April 30, 2020 (closed)25,000 17.92

In April and May 2020, EOG entered into Mont Belvieu propane price swap contracts for the period from May 1, 2020 through December 31, 2020, with notional volumes of 25,000 Bbld at a weighted average price of $16.41 per Bbl. These contracts offset the remaining Mont Belvieu propane price swap contracts for the same time period with notional volumes of 25,000 Bbld at a weighted average price of $17.92 per Bbl. EOG received net cash of $8.0 million through December 31, 2020, for the settlement of certain of these contracts, and expects to receive net cash of $1.2 million during January 2021 for the settlement of the remaining contracts. The offsetting contracts were excluded from the above table.
Natural Gas | Price Swaps  
Derivatives, Fair Value [Line Items]  
Schedule of Derivative Instruments Presented below is a comprehensive summary of EOG's natural gas NYMEX Henry Hub price swap contracts as of December 31, 2020, with notional volumes sold (purchased) expressed in million British thermal units (MMBtu) per day (MMBtud) and prices expressed in dollars per MMBtu ($/MMBtu).
Natural Gas NYMEX Henry Hub Price Swap Contracts
 Volume (MMBtud)Weighted Average Price ($/MMBtu)
2021
April 1, 2021 through December 31, 2021500,000 $2.99 
2022
January 1, 2022 through December 31, 202220,000 $2.75 

In December 2020, EOG entered into natural gas NYMEX Henry Hub price swap contracts for the period from January 1, 2021 through March 31, 2021, with notional volumes of 500,000 MMBtud at a weighted average price of $2.43 per MMBtu. These contracts offset the remaining natural gas NYMEX Henry Hub price swap contracts for the same time period with notional volumes of 500,000 MMBtud at a weighted average price of $2.99 per MMBtu. EOG expects to receive net cash of $25.2 million during 2021 for the settlement of these contracts. The offsetting contracts were excluded from the above table.
Natural Gas | Collars  
Derivatives, Fair Value [Line Items]  
Schedule of Derivative Instruments
EOG has entered into natural gas collar contracts, which establish ceiling and floor prices for the sale of notional volumes of natural gas as specified in the collar contracts. The collars require that EOG pay the difference between the ceiling price and the NYMEX Henry Hub natural gas price for the contract month (Henry Hub Index Price) in the event the Henry Hub Index Price is above the ceiling price. The collars grant EOG the right to receive the difference between the floor price and the Henry Hub Index Price in the event the Henry Hub Index Price is below the floor price. In March 2020, EOG executed the early termination provision granting EOG the right to terminate certain 2020 natural gas collar contracts with notional volumes of 250,000 MMBtud at a weighted average ceiling price of $2.50 per MMBtu and a weighted average floor price of $2.00 per MMBtu for the period from April 1, 2020 through July 31, 2020. EOG received net cash of $7.8 million for the settlement of these contracts. Presented below is a comprehensive summary of EOG's natural gas collar contracts as of December 31, 2020, with notional volumes expressed in MMBtud and prices expressed in $/MMBtu.

Natural Gas Collar Contracts
Weighted Average Price ($/MMBtu)
 Volume (MMBtud)Ceiling PriceFloor Price
2020
April 1, 2020 through July 31, 2020 (closed)250,000 $2.50 $2.00 

In April 2020, EOG entered into natural gas collar contracts for the period from August 1, 2020 through October 31, 2020, with notional volumes of 250,000 MMBtud at a ceiling price of $2.50 per MMBtu and a floor price of $2.00 per MMBtu. These contracts offset the remaining natural gas collar contracts for the same time period with notional volumes of 250,000 MMBtud at a ceiling price of $2.50 per MMBtu and a floor price of $2.00 per MMBtu. EOG received net cash of $1.1 million for the settlement of these contracts. The offsetting contracts were excluded from the above table.
Natural Gas | Rockies Differential Basis Swaps  
Derivatives, Fair Value [Line Items]  
Schedule of Derivative Instruments EOG has entered into natural gas basis swap contracts in order to fix the differential between pricing in the Rocky Mountain area and NYMEX Henry Hub prices (Rockies Differential). Presented below is a comprehensive summary of EOG's Rockies Differential basis swap contracts as of December 31, 2020. The weighted average price differential expressed in $/MMBtu represents the amount of reduction to NYMEX Henry Hub prices for the notional volumes expressed in MMBtud covered by the basis swap contracts.
Rockies Differential Basis Swap Contracts
 Volume (MMBtud)Weighted Average Price Differential
($/MMBtu)
2020
January 1, 2020 through December 31, 2020 (closed)30,000 $0.55 
Natural Gas | HSC Differential Basis Swaps [Member]  
Derivatives, Fair Value [Line Items]  
Schedule of Derivative Instruments
EOG has also entered into natural gas basis swap contracts in order to fix the differential between pricing at the Houston Ship Channel (HSC) and NYMEX Henry Hub prices (HSC Differential). In March 2020, EOG executed the early termination provision granting EOG the right to terminate certain 2020 HSC Differential basis swaps with notional volumes of 60,000 MMBtud at a weighted average price differential of $0.05 per MMBtu for the period from April 1, 2020 through December 31, 2020. EOG paid net cash of $0.4 million for the settlement of these contracts. Presented below is a comprehensive summary of EOG's HSC Differential basis swap contracts as of December 31, 2020. The weighted average price differential expressed in $/MMBtu represents the amount of reduction to NYMEX Henry Hub prices for the notional volumes expressed in MMBtud covered by the basis swap contracts.
HSC Differential Basis Swap Contracts
 Volume (MMBtud)Weighted Average Price Differential
($/MMBtu)
2020
January 1, 2020 through December 31, 2020 (closed)60,000 $0.05 
Natural Gas | Waha Differential Basis Swaps [Member]  
Derivatives, Fair Value [Line Items]  
Schedule of Derivative Instruments
EOG has also entered into natural gas basis swap contracts in order to fix the differential between pricing at the Waha Hub in West Texas and NYMEX Henry Hub prices (Waha Differential). Presented below is a comprehensive summary of EOG's Waha Differential basis swap contracts as of December 31, 2020. The weighted average price differential expressed in $/MMBtu represents the amount of reduction to NYMEX Henry Hub prices for the notional volumes expressed in MMBtud covered by the basis swap contracts.
Waha Differential Basis Swap Contracts
 Volume (MMBtud)Weighted Average Price Differential
($/MMBtu)
2020
January 1, 2020 through April 30, 2020 (closed)50,000 $1.40 

In April 2020, EOG entered into Waha Differential basis swap contracts for the period from May 1, 2020 through December 31, 2020, with notional volumes of 50,000 MMBtud at a weighted average price differential of $0.43 per MMBtu. These contracts offset the remaining Waha Differential basis swap contracts for the same time period with notional volumes of 50,000 MMBtud at a weighted average price differential of $1.40 per MMBtu. EOG paid net cash of $11.9 million for the settlement of these contracts. The offsetting contracts were excluded from the above table.