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Suspended Wells and Exploration Expenses (Tables) | 12 Months Ended
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Dec. 31, 2023
Extractive Industries [Abstract] |
Net Changes in Suspended Exploratory Well Costs | The following table reflects the net changes in suspended exploratory well costs during 2023, 2022 and 2021:
| Millions of Dollars |
| 2023 | 2022 | 2021 |
Beginning balance | $ | 527 |  | 660 |  | 682 |  |
Additions pending the determination of proved reserves | — |  | 5 |  | 10 |  |
Reclassifications to proved properties | (285) |  | (7) |  | — |  |
Charged to dry hole expense | (58) |  | (131) |  | (32) |  |
Ending balance | $ | 184 |  | 527 |  | 660 |  |
Aging of Suspended Well Cost | The following table provides an aging of suspended well balances at December 31:
| Millions of Dollars
| 2023 | 2022 | 2021 |
Exploratory well costs capitalized for a period of one year or less | $ | — |  | 15 |  | 4 |  |
Exploratory well costs capitalized for a period greater than one year | 184 |  | 512 |  | 656 |  |
Ending balance | $ | 184 |  | 527 |  | 660 |  |
Number of projects with exploratory well costs capitalized for a period greater than one year | 14 |  | 17 |  | 22 |  |
Aging of Exploratory Well Cost, Capitalized for More than One Year | The following table provides a further aging of those exploratory well costs that have been capitalized for more than one year since the completion of drilling as of December 31, 2023:
| Millions of Dollars
|  | Suspended Since
| Total | 2020-2022 | 2017-2019 | 2006-2016
WL4-00—Malaysia(2) | 36 |  | 19 |  | 17 |  | — |
PL891—Norway(1) | 30 |  | 30 |  | — |  | — |
West Willow—Alaska(1) | 29 |  | — |  | 29 |  | — |
Narwhal Trend—Alaska(1) | 25 |  | — |  | 25 |  | — |
PL782S—Norway(1) | 19 |  | — |  | 19 |  | — |
Montney—Canada(1) | 16 |  | 8 |  | 8 |  | — |
Other of $10 million or less each(1)(2) | 29 |  | — |  | 4 |  | 25 |
Total | $ | 184 |  | 57 |  | 102 |  | 25 |
(1)Additional appraisal wells planned. (2)Appraisal drilling complete; costs being incurred to assess development.

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- Definition Tabular disclosure of the change in capitalized exploratory costs during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 1B -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482274/932-235-50-1B + Details
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- Definition Tabular disclosure of the amount of exploratory well costs that have been capitalized after the completion of drilling and the number of projects for which those costs relate. Additionally, for exploratory well costs that have been capitalized for periods greater than one year at the most recent balance sheet date, this block of text may be used to disclose an aging of those amounts by year, or by using a range of years, and the number of projects to which those costs relate. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 1B -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482274/932-235-50-1B + Details
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- Definition Tabular disclosure of exploratory well costs that continue to be capitalized for more than one year after the completion of drilling. Information may include a description of the projects and the activities that the enterprise has undertaken to date in order to evaluate the reserves and the projects, and the remaining activities required to classify the associated reserves as proved. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 1B -Subparagraph b -Publisher FASB -URI https://asc.fasb.org//1943274/2147482274/932-235-50-1B + Details
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