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Exploratory Well Costs | 3 Months Ended
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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 Reserves | 12 |
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 |
(1)Consists of costs related to a project in Trinidad at March 31, 2021.

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- Definition The entire disclosure for parts or all of the information related to suspended well costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=68064819&loc=SL6806780-109447 + Details
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