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Exploratory Well Costs
 12 Months Ended
Dec. 31, 2023
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, 2023, 2022 and 2021 are presented below (in millions):
 202320222021
Balance at January 1$15 $7 $29 
Additions Pending the Determination of Proved Reserves195 135 73 
Reclassifications to Proved Properties(133)(88)(41)
Costs Charged to Expense (1)
(1)(39)(54)
Balance at December 31$76 $15 $7 
(1)    Includes capitalized exploratory well costs charged to either dry hole costs or impairments.

 202320222021
Capitalized exploratory well costs that have been capitalized for a period of one year or less$73 $15 $7 
Capitalized exploratory well costs that have been capitalized for a period greater than one year (1)
3 — — 
Balance at December 31$76 $15 $7 
Number of exploratory wells that have been capitalized for a period greater than one year2 — — 
(1)    Consists of costs related to two projects in the United States at December 31, 2023.