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Exploratory Well Costs
 12 Months Ended
Dec. 31, 2022
Capitalized Exploratory Well Costs [Abstract]  
Exploratory Well Costs Exploratory Well Costs
EOG's net changes in capitalized exploratory well costs for the years ended December 31, 2022, 2021 and 2020 are presented below (in millions):
 202220212020
Balance at January 1$7 $29 $26 
Additions Pending the Determination of Proved Reserves135 73 108 
Reclassifications to Proved Properties(88)(41)(81)
Costs Charged to Expense (1)
(39)(54)(24)
Balance at December 31$15 $7 $29 
(1)    Includes capitalized exploratory well costs charged to either dry hole costs or impairments.

 202220212020
Capitalized exploratory well costs that have been capitalized for a period of one year or less$15 $7 $26 
Capitalized exploratory well costs that have been capitalized for a period greater than one year (1)
— — 3 
Balance at December 31$15 $7 $29 
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.