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Exploratory Well Costs | 9 Months Ended
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Sep. 30, 2021
Capitalized Exploratory Well Costs [Abstract] |
Exploratory Well Costs | Exploratory Well Costs EOG's net changes in capitalized exploratory well costs for the nine-month period ended September 30, 2021, are presented below (in millions):
| Nine Months Ended September 30, 2021
Balance at January 1 | $ | 29 |
Additions Pending the Determination of Proved Reserves | 48 |
Reclassifications to Proved Properties | (4) |
Costs Charged to Expense (1) | (12) |
Balance at September 30 | $ | 61 |
(1)Includes capitalized exploratory well costs charged to either dry hole costs or impairments.
| Nine Months Ended September 30, 2021
Capitalized exploratory well costs that have been capitalized for a period of one year or less | $ | 46 |
Capitalized exploratory well costs that have been capitalized for a period greater than one year (1) | 15 |
Balance at September 30 | $ | 61 |
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 September 30, 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=123377692&loc=SL6806780-109447 + Details
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