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Risk Management Activities (Details)
MMBTU in Thousands
9 Months Ended
Sep. 30, 2021
USD ($)
MMBTU
$ / bbl
MBbls
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Derivatives, Fair Value [Line Items]      
Assets from Price Risk Management Activities | $ $ 18,000,000   $ 65,000,000
Liabilities from Price Risk Management Activities | $ 238,000,000   0
Net Cash Received from (Payments for) Settlements of Commodity Derivative Contracts | $ (516,000,000) $ 999,000,000  
Derivative Collateral [Abstract]      
Collateral Already Posted On Derivative | $ 308,000,000   0
Collateral Held on Derivative | $ 0   0
Assets From Price Risk Management Activities      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Fair Value, Gross Asset | $ 21,000,000    
Derivative Liability, Fair Value, Gross Liability | $ 3,000,000    
Liabilities From Price Risk Management Activities      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Fair Value, Gross Liability | $ 474,000,000    
Derivative Collateral [Abstract]      
Collateral Posted On Derivative | $ 236,000,000    
Other Liabilities      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Fair Value, Gross Liability | $ 153,000,000    
Derivative Collateral [Abstract]      
Collateral Posted On Derivative | $ 72,000,000    
Derivative Contracts - Year Two      
Derivatives, Fair Value [Line Items]      
Net Cash Received from (Payments for) Settlements of Commodity Derivative Contracts | $ 600,000    
Price Risk Derivative | Assets From Price Risk Management Activities      
Derivatives, Fair Value [Line Items]      
Assets from Price Risk Management Activities | $ 18,000,000 [1]   65,000,000
Price Risk Derivative | Other Assets      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Noncurrent | $ 0   1,000,000
Price Risk Derivative | Liabilities From Price Risk Management Activities      
Derivatives, Fair Value [Line Items]      
Liabilities from Price Risk Management Activities | $ 238,000,000 [2]   0
Price Risk Derivative | Other Liabilities      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Noncurrent | $ $ 81,000,000 [3]   $ 1,000,000
Crude Oil | Derivative Contracts - January (closed) | Price Swaps      
Derivatives, Fair Value [Line Items]      
Volume (Bbld) | MBbls 151,000    
Weighted Average Price 50.06    
Crude Oil | Derivative Contracts - February through March (closed) | Price Swaps      
Derivatives, Fair Value [Line Items]      
Volume (Bbld) | MBbls 201,000    
Weighted Average Price 51.29    
Crude Oil | Derivative Contracts - April through June (closed) [Member] | Price Swaps      
Derivatives, Fair Value [Line Items]      
Volume (Bbld) | MBbls 150,000    
Weighted Average Price 51.68    
Crude Oil | Derivative Contracts - July through September | Price Swaps      
Derivatives, Fair Value [Line Items]      
Volume (Bbld) | MBbls 150,000    
Weighted Average Price 52.71    
Crude Oil | Derivative Contracts - January through March - Year Two | Price Swaps      
Derivatives, Fair Value [Line Items]      
Volume (Bbld) | MBbls 140,000    
Weighted Average Price 65.58    
Crude Oil | Derivative Contracts - April through June - Year Two [Member] | Price Swaps      
Derivatives, Fair Value [Line Items]      
Volume (Bbld) | MBbls 140,000    
Weighted Average Price 65.62    
Crude Oil | Derivative Contracts - July through September - Year Two [Member] | Price Swaps      
Derivatives, Fair Value [Line Items]      
Volume (Bbld) | MBbls 140,000    
Weighted Average Price 65.59    
Crude Oil | Derivative Contracts - October through December - Year Two [Member] | Price Swaps      
Derivatives, Fair Value [Line Items]      
Volume (Bbld) | MBbls 140,000    
Weighted Average Price 65.68    
Crude Oil | Derivative Contracts - February (closed) | Roll Differential Swap      
Derivatives, Fair Value [Line Items]      
Volume (Bbld) | MBbls [4] 30,000    
Weighted Average Price [4] 0.11    
Crude Oil | Derivative Contracts - March through October (closed) | Roll Differential Swap      
Derivatives, Fair Value [Line Items]      
Volume (Bbld) | MBbls [4] 125,000    
Weighted Average Price [4] 0.17    
Crude Oil | Derivative Contracts - Year Two | Roll Differential Swap      
Derivatives, Fair Value [Line Items]      
Volume (Bbld) | MBbls [4] 125,000    
Weighted Average Price [4] 0.15    
Crude Oil | Derivative Contracts - November through December | Roll Differential Swap      
Derivatives, Fair Value [Line Items]      
Volume (Bbld) | MBbls [4] 125,000    
Weighted Average Price [4] 0.17    
Crude Oil | Derivative Contracts - January through March - Year Three | Price Swaps      
Derivatives, Fair Value [Line Items]      
Volume (Bbld) | MBbls 60,000    
Weighted Average Price 66.21    
Natural Gas Liquids | Derivative Contracts - January through September (closed) | Mont Belvieu Propane Price Swap      
Derivatives, Fair Value [Line Items]      
Volume (Bbld) | MBbls 15,000    
Weighted Average Price 29.44    
Natural Gas Liquids | Derivative Contracts - October through December | Mont Belvieu Propane Price Swap      
Derivatives, Fair Value [Line Items]      
Volume (Bbld) | MBbls 15,000    
Weighted Average Price 29.44    
Natural Gas | Derivative Contracts - Year Two | Price Swaps      
Derivatives, Fair Value [Line Items]      
Volume (MMBtud) | MMBTU 725    
Weighted Average Price 3.57    
Natural Gas | Derivative Contracts - Year Two | Basis Swaps      
Derivatives, Fair Value [Line Items]      
Volume (MMBtud) | MMBTU [5] 10    
Weighted Average Price [5] 0.00    
Natural Gas | Derivative Contracts - January through March (closed) | Price Swaps      
Derivatives, Fair Value [Line Items]      
Volume (MMBtud) | MMBTU 500    
Weighted Average Price 2.99    
Natural Gas | Derivative Contracts - April through September (closed) | Price Swaps      
Derivatives, Fair Value [Line Items]      
Volume (MMBtud) | MMBTU 500    
Weighted Average Price 2.99    
Natural Gas | Derivative Contracts - April through September (closed) | Japan Korea Marker Price Swap      
Derivatives, Fair Value [Line Items]      
Volume (MMBtud) | MMBTU 70    
Weighted Average Price 6.65    
Natural Gas | Derivative Contracts - October (closed) | Price Swaps      
Derivatives, Fair Value [Line Items]      
Volume (MMBtud) | MMBTU 500    
Weighted Average Price 2.99    
Natural Gas | Derivative Contracts - November through December | Price Swaps      
Derivatives, Fair Value [Line Items]      
Volume (MMBtud) | MMBTU 500    
Weighted Average Price 2.99    
Natural Gas | Derivative Contracts - Year Three | Price Swaps      
Derivatives, Fair Value [Line Items]      
Volume (MMBtud) | MMBTU 725    
Weighted Average Price 3.18    
Natural Gas | Derivative Contracts - Year Three | Basis Swaps      
Derivatives, Fair Value [Line Items]      
Volume (MMBtud) | MMBTU [5] 10    
Weighted Average Price [5] 0.00    
Natural Gas | Derivative Contracts - Year Four | Price Swaps      
Derivatives, Fair Value [Line Items]      
Volume (MMBtud) | MMBTU 625    
Weighted Average Price 3.06    
Natural Gas | Derivative Contracts - Year Four | Basis Swaps      
Derivatives, Fair Value [Line Items]      
Volume (MMBtud) | MMBTU [5] 10    
Weighted Average Price [5] 0.00    
Natural Gas | Derivative Contracts - Year Five | Price Swaps      
Derivatives, Fair Value [Line Items]      
Volume (MMBtud) | MMBTU 425    
Weighted Average Price 3.05    
Natural Gas | Derivative Contracts - Year Five | Basis Swaps      
Derivatives, Fair Value [Line Items]      
Volume (MMBtud) | MMBTU [5] 10    
Weighted Average Price [5] 0.00    
Natural Gas | Offsetting Derivative Contracts - January through March (closed) | Price Swaps      
Derivatives, Fair Value [Line Items]      
Volume (MMBtud) | MMBTU 500    
Weighted Average Price 2.43    
Natural Gas | OffSetting Derivative Contracts - November through December | Price Swaps      
Derivatives, Fair Value [Line Items]      
Volume (MMBtud) | MMBTU 500    
Weighted Average Price 2.83    
Natural Gas | OffSetting Derivative Contracts - Year Two | Price Swaps      
Derivatives, Fair Value [Line Items]      
Volume (MMBtud) | MMBTU 0    
Weighted Average Price 0    
Natural Gas | OffSetting Derivative Contracts - Year Three | Price Swaps      
Derivatives, Fair Value [Line Items]      
Volume (MMBtud) | MMBTU 0    
Weighted Average Price 0    
Natural Gas | OffSetting Derivative Contracts - Year Four | Price Swaps      
Derivatives, Fair Value [Line Items]      
Volume (MMBtud) | MMBTU 0    
Weighted Average Price 0    
Natural Gas | OffSetting Derivative Contracts - Year Five | Price Swaps      
Derivatives, Fair Value [Line Items]      
Volume (MMBtud) | MMBTU 0    
Weighted Average Price 0    
Natural Gas | Offsetting Derivative Contracts - April through September (closed) | Price Swaps      
Derivatives, Fair Value [Line Items]      
Volume (MMBtud) | MMBTU 570    
Weighted Average Price 2.81    
Natural Gas | Offsetting Derivative Contracts - April through September (closed) | Japan Korea Marker Price Swap      
Derivatives, Fair Value [Line Items]      
Volume (MMBtud) | MMBTU 0    
Weighted Average Price 0    
Natural Gas | OffSetting Derivative Contracts - October (closed) | Price Swaps      
Derivatives, Fair Value [Line Items]      
Volume (MMBtud) | MMBTU 500    
Weighted Average Price 2.83    
Natural Gas | Derivative Contracts Terminated - Year Two | Price Swaps      
Derivatives, Fair Value [Line Items]      
Volume (MMBtud) | MMBTU [6] 20    
Weighted Average Price [6] 2.75    
Natural Gas | OffSetting Derivative Contracts Terminated - Year Two | Price Swaps      
Derivatives, Fair Value [Line Items]      
Volume (MMBtud) | MMBTU [6] 0    
Weighted Average Price [6] 0    
[1] The current portion of Assets from Price Risk Management Activities consists of gross assets of $21 million, partially offset by gross liabilities of $3 million, at September 30, 2021.
[2] The current portion of Liabilities from Price Risk Management Activities consists of gross liabilities of $474 million, partially offset by collateral posted with counterparties of $236 million, at September 30, 2021.
[3] The noncurrent portion of Liabilities from Price Risk Management Activities consists of gross liabilities of $153 million, partially offset by collateral posted with counterparties of $72 million, at September 30, 2021.
[4] This settlement index is used to fix the differential in pricing between the NYMEX calendar month average and the physical crude oil delivery month.
[5] This settlement index is used to fix the differential between pricing at the Houston Ship Channel and NYMEX Henry Hub prices.
[6] In January 2021, EOG executed the early termination provision granting EOG the right to terminate all of its open 2022 natural gas price swap contracts which were open at that time. EOG received net cash of $0.6 million for the settlement of these contracts.