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Exploratory Well Costs (Notes)
 12 Months Ended
Dec. 31, 2021
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, 2021, 2020 and 2019 are presented below (in millions):
 202120202019
Balance at January 1$29 $26 $4 
Additions Pending the Determination of Proved Reserves73 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.

 202120202019
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.