Fair Value Measurements

3 Months Ended

Mar. 31, 2016

Fair Value Measurements

As more fully discussed in Note 13 to the Consolidated Financial Statements included in EOG's 2015 Annual Report, certain of EOG's financial and nonfinancial assets and liabilities are reported at fair value on the 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 March 31, 2016. There were no such amounts outstanding at December 31, 2015. Amounts shown in millions.



	Fair Value Measurements Using:
	Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
At March 31, 2016
Financial Assets
Natural Gas Price Swaps	$	—	$	4	$	—	$	4

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.

Fair Value of Debt. At March 31, 2016 and December 31, 2015, EOG had outstanding $6,990 million and $6,390 million, respectively, aggregate principal amount of senior notes, which had estimated fair values of approximately $7,163 million and $6,524 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.