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Exploratory Well Costs | 12 Months Ended
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Dec. 31, 2022
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, 2022, 2021 and 2020 are presented below (in millions):
| 2022 |  | 2021 |  | 2020
Balance at January 1 | $ | 7 |  |  | $ | 29 |  |  | $ | 26 |
Additions Pending the Determination of Proved Reserves | 135 |  |  | 73 |  |  | 108 |
Reclassifications to Proved Properties | (88) |  |  | (41) |  |  | (81) |
Costs Charged to Expense (1) | (39) |  |  | (54) |  |  | (24) |
Balance at December 31 | $ | 15 |  |  | $ | 7 |  |  | $ | 29 |
(1) Includes capitalized exploratory well costs charged to either dry hole costs or impairments.
| 2022 |  | 2021 |  | 2020
Capitalized exploratory well costs that have been capitalized for a period of one year or less | $ | 15 |  |  | $ | 7 |  |  | $ | 26 |
Capitalized exploratory well costs that have been capitalized for a period greater than one year (1) | — |  |  | — |  |  | 3 |
Balance at December 31 | $ | 15 |  |  | $ | 7 |  |  | $ | 29 |
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.

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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 https://asc.fasb.org/extlink&oid=126939881&loc=SL6806780-109447 + Details
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