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Suspended Wells and Exploration Expenses | 12 Months Ended
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Dec. 31, 2023
Extractive Industries [Abstract] |
Suspended Wells and Exploration Expenses | Note 6—Suspended Wells and Exploration Expenses 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 |  |
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 |  |
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. Exploration Expenses The charges discussed below are included in the “Exploration expenses” line on our consolidated income statement. 2023 In our Europe, Middle East and North Africa segment, after further evaluation we recognized a before-tax expense of $37 million for dry hole costs associated with the suspended Warka discovery well, drilled in 2020, on license PL1009 in the Norwegian Sea. In our Alaska segment, we recorded a before-tax expense of approximately $31 million for dry hole costs associated with the Bear-1 exploration well. 2022 In the fourth quarter, we recorded a before-tax expense of $129 million for impairment of certain aged, suspended wells associated with Surmont in our Canada segment. In our Europe, Middle East and North Africa segment, we recorded a before-tax expense of $102 million for dry hole costs associated with four operated exploration and appraisal wells and one partner-operated well that were drilled in Norway in 2022.

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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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