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Risk Management Activities (Details) (USD $)
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12 Months Ended | 12 Months Ended | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 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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Dec. 31, 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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Dec. 31, 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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Dec. 31, 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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Dec. 31, 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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Dec. 31, 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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Dec. 31, 2013
Crude Oil Derivative Contracts January - June [Member]
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Dec. 31, 2013
Natural Gas Derivative Contracts January [Member]
Btu
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Dec. 31, 2013
Natural Gas Derivative Contracts February - December [Member]
Btu
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Dec. 31, 2014
Natural Gas Derivative Contracts Year Two January - December [Member]
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Dec. 31, 2014
Crude Oil Derivative Contracts January - June Year Two [Member]
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Dec. 31, 2013
Crude Oil Derivative Contracts July - December [Member]
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| Notes To Financial Statements [Abstract] | |||||||||||||||||||||
| Net Gains on Mark-to-Market Commodity Derivative Contracts | $ 393,744,000 | $ 626,053,000 | $ 61,912,000 | ||||||||||||||||||
| Net Realized Gains | 711,479,000 | 180,701,000 | 7,033,000 | ||||||||||||||||||
| Derivative [Line Items] | |||||||||||||||||||||
| Volume (MMBtu) | 150,000 | 150,000 | |||||||||||||||||||
| Volume (Bbld) | 101,000 | 93,000 | |||||||||||||||||||
| Volumes (MMBtud) - Derivative Option Contracts | 150,000 | 150,000 | |||||||||||||||||||
| Average Price ($/MMBtu) - Derivative Option Contracts | 4.79 | 4.79 | |||||||||||||||||||
| Derivative Weighted Average Price Crude Oil ($/Bbl) | 99.29 | 98.44 | |||||||||||||||||||
| Derivative Weighted Average Price Natural Gas ($/MMBtu) | 4.79 | 4.79 | |||||||||||||||||||
| Volumes (Bbld) - Derivative Option Contracts | 54,000 | 62,000 | |||||||||||||||||||
| Average Price ($/Bbl) - Derivative Option Contracts | 98.91 | 100.24 | |||||||||||||||||||
| Proceeds from financial derivative contracts settled during the period | 36,600,000 | ||||||||||||||||||||
| Derivatives, Fair Value [Line Items] | |||||||||||||||||||||
| Receivable Major Customer Percentage | 26.00% | 10.00% | |||||||||||||||||||
| Derivatives Assets, Current | 166,135,000 | 450,730,000 | 166,000,000 | 451,000,000 | |||||||||||||||||
| Other Assets | 0 | 35,000,000 | |||||||||||||||||||
| Derivative Liabilities, Current | 7,617,000 | 0 | 8,000,000 | 0 | |||||||||||||||||
| Other Liabilities | 13,000,000 | 0 | 4,000,000 | 3,000,000 | 55,000,000 | 52,000,000 | |||||||||||||||
| Foreign Currency Exchange Rate Derivative [Abstract] | |||||||||||||||||||||
| Debt Instrument Issued by EOG's Canadian Subsidiary | 150,000,000 | ||||||||||||||||||||
| After-Tax Net Impact Other Comprehensive Income Increase (Decrease) From The Foreign Currency Swap | 1,000,000 | (1,000,000) | 3,000,000 | ||||||||||||||||||
| Interest Rate Derivative [Abstract] | |||||||||||||||||||||
| Interest Rate Swap, Notional Amount | 350,000,000 | ||||||||||||||||||||
| After-Tax Net Impact Other Comprehensive Income Increase (Decrease) From Interest Rate Swap | (100,000) | (3,000,000) | 1,000,000 | ||||||||||||||||||
| Derivative Collateral [Abstract] | |||||||||||||||||||||
| Collateral Held on Derivative | $ 6,000,000 | $ 67,000,000 | |||||||||||||||||||