Exploratory Well Costs (Tables)

12 Months Ended

Dec. 31, 2021

Capitalized Exploratory Well Costs [Abstract]

Net Changes in Capitalized Exploratory Well Costs

EOG's net changes in capitalized exploratory well costs for the years ended December 31, 2021, 2020 and 2019 are presented below (in millions):

	2021		2020		2019
Balance at January 1	$	29	$	26	$	4
Additions Pending the Determination of Proved Reserves	73		108		83
Reclassifications to Proved Properties	(41)		(81)		(39)
Costs Charged to Expense (1)	(54)		(24)		(22)
Balance at December 31	$	7	$	29	$	26

(1)    Includes capitalized exploratory well costs charged to either dry hole costs or impairments.

Schedule of Aging of Capitalized Exploratory Well Costs

	2021		2020		2019
Capitalized exploratory well costs that have been capitalized for a period of one year or less	$	7	$	26	$	26
Capitalized exploratory well costs that have been capitalized for a period greater than one year (1)	—		3		—
Balance at December 31	$	7	$	29	$	26
Number of exploratory wells that have been capitalized for a period greater than one year	—		1		—

(1)    Consists of costs related to a project in the United States at December 31, 2020.