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Fair Value Measurements | 12 Months Ended
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Dec. 31, 2012
Fair Value Measurements [Abstract] |
Fair Value Measurements [Text Block] | 12. Fair Value Measurements Certain of EOG's financial and nonfinancial assets and liabilities are reported at fair value on the Consolidated Balance Sheets. An established fair value hierarchy prioritizes the relative reliability of inputs used in fair value measurements. The hierarchy gives highest priority to Level 1 inputs that represent unadjusted quoted market prices in active markets for identical assets and liabilities that the reporting entity has the ability to access at the measurement date. Level 2 inputs are directly or indirectly observable inputs other than quoted prices included within Level 1. Level 3 inputs are unobservable inputs and have the lowest priority in the hierarchy. EOG gives consideration to the credit risk of its counterparties, as well as its own credit risk, when measuring financial assets and liabilities at fair value. The following table provides fair value measurement information within the fair value hierarchy for certain of EOG's financial assets and liabilities carried at fair value on a recurring basis at December 31, 2012 and 2011 (in millions):
|  |  | Fair Value Measurements Using:
|  |  | Quoted |  |  | Significant |  |  |  |  |  |
|  |  | Prices in |  |  | Other |  |  | Significant |  |  |
|  |  | Active |  |  | Observable |  |  | Unobservable |  |  |
|  |  | Markets |  |  | Inputs |  |  | Inputs |  |  |
|  |  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |  |  | Total
At December 31, 2012 |  |  |  |  |  |  |  |  |  |  |  |
Financial Assets: |  |  |  |  |  |  |  |  |  |  |  |
| Crude Oil Swaps |  | $ | - |  | $ | 65 |  | $ | - |  | $ | 65
| Crude Oil Options/Swaptions |  |  | - |  |  | 36 |  |  | - |  |  | 36
| Natural Gas Options/Swaptions |  |  | - |  |  | 65 |  |  | - |  |  | 65
Financial Liabilities: |  |  |  |  |  |  |  |  |  |  |  |
| Crude Oil Options/Swaptions |  | $ | - |  | $ | 8 |  | $ | - |  | $ | 8
| Natural Gas Options/Swaptions |  |  | - |  |  | 13 |  |  | - |  |  | 13
| Foreign Currency Rate Swap |  |  | - |  |  | 55 |  |  | - |  |  | 55
| Interest Rate Swap |  |  | - |  |  | 4 |  |  | - |  |  | 4
At December 31, 2011 |  |  |  |  |  |  |  |  |  |  |  |
Financial Assets: |  |  |  |  |  |  |  |  |  |  |  |
| Crude Oil Swaps |  | $ | - |  | $ | 29 |  | $ | - |  | $ | 29
| Crude Oil Options/Swaptions |  |  | - |  |  | 4 |  |  | - |  |  | 4
| Natural Gas Swaps |  |  | - |  |  | 81 |  |  | - |  |  | 81
| Natural Gas Options/Swaptions |  |  | - |  |  | 372 |  |  | - |  |  | 372
Financial Liabilities: |  |  |  |  |  |  |  |  |  |  |  |
| Foreign Currency Rate Swap |  | $ | - |  | $ | 52 |  | $ | - |  | $ | 52
| Interest Rate Swap |  |  | - |  |  | 3 |  |  | - |  |  | 3
The estimated fair value of crude oil and natural gas derivative contracts (including options/swaptions) and the interest rate swap contract (see Note 11) was based upon forward commodity price and interest rate curves based on quoted market prices. The estimated fair value of the foreign currency rate swap was based upon forward currency rates. Swaps were valued using market prices and discount rates from an independent third-party provider of financial market data. The Black 76 Model is utilized in valuing options. The initial measurement of asset retirement obligations at fair value is calculated using discounted cash flow techniques and based on internal estimates of future retirement costs associated with property, plant and equipment. Significant Level 3 inputs used in the calculation of asset retirement obligations include plugging costs and reserve lives. A reconciliation of EOG's asset retirement obligations is presented in Note 14. During 2012, proved and unproved oil and gas properties and other assets with a carrying amount of $1,524 million were written down to their fair value of $391 million, resulting in pretax impairment charges of $1,133 million. Included in the $1,133 million pretax impairment charges are $60 million of impairments of proved oil and gas properties and other property, plant and equipment for which EOG utilized accepted offers from third-party purchasers as the basis for determining fair value. During 2011, proved oil and gas properties with a carrying amount of $1,450 million were written down to their fair value of $616 million, resulting in pretax impairment charges of $834 million. In connection with $278 million of impairments of certain natural gas assets in the United States during 2011, EOG utilized accepted bids as the basis for determining fair value. Significant Level 3 assumptions associated with the calculation of discounted cash flows used in the impairment analysis include EOG's estimate of future crude oil and natural gas prices, production costs, development expenditures, anticipated production of proved reserves, appropriate risk-adjusted discount rates and other relevant data. Fair Value of Debt. At December 31, 2012 and 2011, EOG had outstanding $6,290 million and $5,040 million, respectively, aggregate principal amount of debt, which had estimated fair values of approximately $7,032 million and $5,657 million, respectively. The estimated fair value of debt was based upon quoted market prices and, where such prices were not available, other observable (Level 2) inputs regarding interest rates available to EOG at year-end.

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- Definition The entire disclosure of the fair value measurement of assets and liabilities, which includes financial instruments measured at fair value that are classified in shareholders' equity, which may be measured on a recurring or nonrecurring basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19279-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19190-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 33 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 6 -Footnote 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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