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Suspended Wells and Exploration Expenses (Tables) | 12 Months Ended
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Dec. 31, 2025
Extractive Industries [Abstract] |
Net Changes in Suspended Exploratory Well Costs | The following table reflects the net changes in suspended exploratory well costs during 2025, 2024 and 2023:
| Millions of Dollars |
| 2025 | 2024 | 2023 |
Beginning balance | $ | 196 |  | 184 |  | 527 |  |
Additions pending the determination of proved reserves | 113 |  | 32 |  | — |  |
Reclassifications to proved properties | — |  | (2) |  | (285) |  |
Sales of suspended wells | (30) |  | — |  | — |  |
Charged to dry hole expense | (36) |  | (18) |  | (58) |  |
Ending balance | $ | 243 |  | 196 |  | 184 |  |
Aging of Suspended Well Cost | The following table provides an aging of suspended well balances at December 31:
| Millions of Dollars
| 2025 | 2024 | 2023 |
Exploratory well costs capitalized for a period of one year or less | $ | 110 |  | 33 |  | — |  |
Exploratory well costs capitalized for a period greater than one year | 133 |  | 163 |  | 184 |  |
Ending balance | $ | 243 |  | 196 |  | 184 |  |
Number of projects with exploratory well costs capitalized for a period greater than one year | 13 |  | 13 |  | 14 |  |
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, 2025:
| Millions of Dollars
|  | Suspended Since
| Total | 2021-2024 | 2018-2020 | 2017 and Prior
PL891—Norway(1) | 31 |  | — |  | 31 |  | — |
West Willow—Alaska(2) | 30 |  | — |  | 30 |  | — |
Narwhal Trend—Alaska(1) | 25 |  | — |  | 25 |  | — |
Montney—Canada(2) | 15 |  | 7 |  | 8 |  | — |
Other of $10 million or less each(1)(2) | 32 |  | 4 |  | — |  | 28 |
Total | $ | 133 |  | 11 |  | 94 |  | 28 |
(1)Appraisal drilling complete; costs being incurred to assess development. (2)Additional appraisal wells planned.

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- Definition Tabular disclosure of the change in capitalized exploratory costs during the period. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 932 -SubTopic 235 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477215/932-235-50-1B + Details
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- Definition Tabular disclosure of aging for exploratory well cost capitalized for period of greater than one year after completion of drilling and number of related projects in oil- and gas-producing activities. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 932 -SubTopic 235 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477215/932-235-50-1B + Details
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- Definition Tabular disclosure of exploratory well cost capitalized for period of greater than one year after completion of drilling in oil- and gas-producing activities. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 932 -SubTopic 235 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477215/932-235-50-1B + Details
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