Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2021

Fair Value Disclosures [Abstract]

Fair Value Assets and Liabilities Measured On Recurring Basis

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, 2021 and December 31, 2020 (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 September 30, 2021
Financial Assets:
Natural Gas Swaps	$	—	$	21	$	—	$	21
Financial Liabilities:
Natural Gas Swaps	—		329		—		329
Crude Oil Swaps	—		226		—		226
Crude Oil Roll Differential Swaps	—		32		—		32
Natural Gas Liquids Swaps	—		43		—		43
At December 31, 2020
Financial Assets:
Natural Gas Swaps	$	—	$	66	$	—	$	66
Financial Liabilities:
Crude Oil Roll Differential Swaps	—		1		—		1