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Risk Management Activities (Details) (USD $)
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3 Months Ended | 9 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 6 Months Ended | 9 Months Ended | 6 Months Ended | 9 Months Ended | ||||||||||||||||||||
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Sep. 30, 2012
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Sep. 30, 2011
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Sep. 30, 2012
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Sep. 30, 2011
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Dec. 31, 2011
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Sep. 30, 2012
Crude Oil and Natural Gas Derivative Contracts [Member]
Liabilities From Price Risk Management Activities [Member]
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Dec. 31, 2011
Crude Oil and Natural Gas Derivative Contracts [Member]
Liabilities From Price Risk Management Activities [Member]
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Sep. 30, 2012
Crude Oil and Natural Gas Derivative Contracts [Member]
Assets From Price Risk Management Activities [Member]
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Dec. 31, 2011
Crude Oil and Natural Gas Derivative Contracts [Member]
Assets From Price Risk Management Activities [Member]
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Sep. 30, 2012
Crude Oil and Natural Gas Derivative Contracts [Member]
Other Assets [Member]
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Dec. 31, 2011
Crude Oil and Natural Gas Derivative Contracts [Member]
Other Assets [Member]
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Sep. 30, 2012
Crude Oil and Natural Gas Derivative Contracts [Member]
Other Liabilities [Member]
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Dec. 31, 2011
Crude Oil and Natural Gas Derivative Contracts [Member]
Other Liabilities [Member]
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Sep. 30, 2012
Interest Rate Swap [Member]
Other Liabilities [Member]
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Dec. 31, 2011
Interest Rate Swap [Member]
Other Liabilities [Member]
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Sep. 30, 2012
Foreign Currency Swap [Member]
Other Liabilities [Member]
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Dec. 31, 2011
Foreign Currency Swap [Member]
Other Liabilities [Member]
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Sep. 30, 2012
Crude Oil Derivative Contracts January - February [Member]
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Sep. 30, 2012
Natural Gas Derivative Contracts January - October [Member]
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Dec. 31, 2013
Natural Gas Derivative Contracts Year Two January - December [Member]
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Dec. 31, 2014
Natural Gas Derivative Contracts Year Three January - December [Member]
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Sep. 30, 2012
Natural Gas Derivative Contracts - November - December [Member]
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Jun. 30, 2014
Crude Oil Derivative Contracts January - June Year Three [Member]
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Jun. 30, 2013
Crude Oil Derivative Contracts January - June Year Two [Member]
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Sep. 30, 2012
Crude Oil Derivative Contracts March - June [Member]
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Sep. 30, 2012
Crude Oil Derivative Contracts July - August [Member]
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Sep. 30, 2012
Crude Oil Derivative Contracts September [Member]
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Dec. 31, 2013
Crude Oil Derivative Contracts July - December Year Two [Member]
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Sep. 30, 2012
Crude Oil Derivative Contracts October - December [Member]
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| Derivative [Line Items] | |||||||||||||||||||||||||||||
| Volume (MMBtu) | 525,000 | 150,000 | 525,000 | ||||||||||||||||||||||||||
| Volume (Bbld) | 34,000 | 98,000 | 52,000 | 50,000 | 32,000 | 54,000 | 42,000 | ||||||||||||||||||||||
| Volumes (MMBtud) - Derivative Option Contracts | 150,000 | 150,000 | 425,000 | ||||||||||||||||||||||||||
| Average Price ($/MMBtu) - Derivative Option Contracts | 4.79 | 4.79 | 5.44 | ||||||||||||||||||||||||||
| Derivative Weighted Average Price Crude Oil ($/Bbl) | 104.95 | 99.39 | 105.80 | 106.90 | 106.61 | 99.38 | 105.19 | ||||||||||||||||||||||
| Derivative Weighted Average Price Natural Gas ($/MMBtu) | 5.44 | 4.79 | 5.44 | ||||||||||||||||||||||||||
| Volumes (Bbld) - Derivative Option Contracts | 15,000 | 25,000 | 59,000 | ||||||||||||||||||||||||||
| Average Price ($/Bbl) - Derivative Option Contracts | 103.54 | 106.27 | 100.45 | ||||||||||||||||||||||||||
| Proceeds from financial derivative contracts settled during the period | $ 36,600,000 | ||||||||||||||||||||||||||||
| Derivatives, Fair Value [Line Items] | |||||||||||||||||||||||||||||
| Derivatives Assets, Current | 248,698,000 | 248,698,000 | 450,730,000 | 238,000,000 | 451,000,000 | ||||||||||||||||||||||||
| Other Assets | 14,000,000 | 35,000,000 | |||||||||||||||||||||||||||
| Derivative Liabilities, Current | 1,000,000 | 0 | |||||||||||||||||||||||||||
| Other Liabilities | 6,000,000 | 0 | 4,000,000 | 3,000,000 | 57,000,000 | 52,000,000 | |||||||||||||||||||||||
| Foreign Currency Exchange Rate Derivative [Abstract] | |||||||||||||||||||||||||||||
| Debt Instrument Issued by EOG's Canadian Subsidiary | 150,000,000 | 150,000,000 | |||||||||||||||||||||||||||
| After-Tax Net Impact Other Comprehensive Income Increase (Decrease) From The Foreign Currency Swap | 1,100,000 | 500,000 | 1,700,000 | 300,000 | |||||||||||||||||||||||||
| Interest Rate Cash Flow Hedges [Abstract] | |||||||||||||||||||||||||||||
| Interest Rate Swap, Notional Amount | 350,000,000 | 350,000,000 | |||||||||||||||||||||||||||
| After-Tax Net Impact From Interest Rate Swap | (200,000) | (1,600,000) | (400,000) | (4,200,000) | |||||||||||||||||||||||||
| Derivative Collateral [Abstract] | |||||||||||||||||||||||||||||
| Collateral Held on Derivative | $ 67,000,000 | ||||||||||||||||||||||||||||