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Exploratory Well Costs | 12 Months Ended
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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):
| 2023 |  | 2022 |  | 2021
Balance at January 1 | $ | 15 |  |  | $ | 7 |  |  | $ | 29 |
Additions Pending the Determination of Proved Reserves | 195 |  |  | 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.
| 2023 |  | 2022 |  | 2021
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 year | 2 |  |  | — |  |  | — |
(1) Consists of costs related to two projects in the United States at December 31, 2023.

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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 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -SubTopic 235 -Topic 932 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482274/932-235-50-1B + Details
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