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Exploratory Well Costs
3 Months Ended
Mar. 31, 2021
Capitalized Exploratory Well Costs [Abstract]  
Exploratory Well Costs Exploratory Well Costs
EOG's net changes in capitalized exploratory well costs for the three-month period ended March 31, 2021, are presented below (in millions):
 Three Months Ended
March 31, 2021
Balance at January 1$29 
Additions Pending the Determination of Proved Reserves12 
Reclassifications to Proved Properties(3)
Costs Charged to Expense (1)
(5)
Balance at March 31$33 
(1)Includes capitalized exploratory well costs charged to either dry hole costs or impairments.

 Three Months Ended
March 31, 2021
Capitalized exploratory well costs that have been capitalized for a period of one year or less$18 
Capitalized exploratory well costs that have been capitalized for a period greater than one year (1)
15 
Balance at March 31$33 
Number of exploratory wells that have been capitalized for a period greater than one year
(1)Consists of costs related to a project in Trinidad at March 31, 2021.