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Exploratory Well Costs (Notes) | 12 Months Ended
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Dec. 31, 2021
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, 2021, 2020 and 2019 are presented below (in millions):
| 2021 |  | 2020 |  | 2019
Balance at January 1 | $ | 29 |  |  | $ | 26 |  |  | $ | 4 |
Additions Pending the Determination of Proved Reserves | 73 |  |  | 108 |  |  | 83 |
Reclassifications to Proved Properties | (41) |  |  | (81) |  |  | (39) |
Costs Charged to Expense (1) | (54) |  |  | (24) |  |  | (22) |
Balance at December 31 | $ | 7 |  |  | $ | 29 |  |  | $ | 26 |
(1) Includes capitalized exploratory well costs charged to either dry hole costs or impairments.
| 2021 |  | 2020 |  | 2019
Capitalized exploratory well costs that have been capitalized for a period of one year or less | $ | 7 |  |  | $ | 26 |  |  | $ | 26 |
Capitalized exploratory well costs that have been capitalized for a period greater than one year (1) | — |  |  | 3 |  |  | — |
Balance at December 31 | $ | 7 |  |  | $ | 29 |  |  | $ | 26 |
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 http://asc.fasb.org/extlink&oid=123377692&loc=SL6806780-109447 + Details
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