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Fair Value Measurements (Notes) | 9 Months Ended
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Sep. 30, 2019
Fair Value Disclosures [Abstract] |
Fair Value Measurements | Fair Value Measurements As more fully discussed in Note 13 to the Consolidated Financial Statements included in EOG's 2018 Annual Report, certain of EOG's financial and nonfinancial assets and liabilities are reported at fair value on the Condensed Consolidated Balance Sheets. 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 September 30, 2019 and December 31, 2018 (in thousands):
| Fair Value Measurements Using:
| Quoted Prices in Active Markets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Total
At September 30, 2019 |  |  |  |  |  |  |  |  |  |  |
Financial Assets: |  |  |  |  |  |  |  |  |  |  |
Natural Gas Swaps | $ | — |  |  | $ | 3,629 |  |  | $ | — |  |  | $ | 3,629 |
Crude Oil Swaps | — |  |  | 119,088 |  |  | — |  |  | 119,088 |
Crude Oil Basis Swaps | — |  |  | 1,162 |  |  | — |  |  | 1,162 |
Natural Gas Basis Swaps | — |  |  | 230 |  |  | — |  |  | 230 |
Financial Liabilities: |  |  |  |  |  |  |
Crude Oil Basis Swaps | $ | — |  |  | $ | 1,482 |  |  | $ | — |  |  | $ | 1,482 |
Natural Gas Basis Swaps | — |  |  | 21 |  |  | — |  |  | 21 |
At December 31, 2018 |  |  |  |  |  |  |
Financial Assets: |  |  |  |  |  |  |
Crude Oil Basis Swaps | $ | — |  |  | $ | 23,806 |  |  | $ | — |  |  | $ | 23,806 |
The estimated fair value of commodity derivative contracts was based upon forward commodity price curves based on quoted market prices. Commodity derivative contracts were valued by utilizing an independent third-party derivative valuation provider who uses various types of valuation models, as applicable. 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 6. Proved oil and gas properties and other assets with a carrying amount of $472 million were written down to their fair value of $340 million, resulting in pretax impairment charges of $132 million for the nine months ended September 30, 2019. Included in the $132 million pretax impairment charges are $89 million for a commodity price-related write-down of other assets. EOG utilized average prices per acre from comparable market transactions and estimated discounted cash flows as the basis for determining the fair value of unproved and proved properties, respectively, received in non-cash property exchanges. See Note 4. Fair Value of Debt. At September 30, 2019 and December 31, 2018, respectively, EOG had outstanding $5,140 million and $6,040 million aggregate principal amount of senior notes, which had estimated fair values at such dates of approximately $5,453 million and $6,027 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 the end of each respective period.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -URI http://asc.fasb.org/topic&trid=2155941 + Details
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