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Suspended Wells and Exploration Expenses (Tables)
 12 Months Ended
Dec. 31, 2024
Extractive Industries [Abstract]  
Net Changes in Suspended Exploratory Well Costs
The following table reflects the net changes in suspended exploratory well costs during 2024, 2023 and 2022:

Millions of Dollars
202420232022
Beginning balance$184 527 660 
Additions pending the determination of proved reserves32 — 5 
Reclassifications to proved properties(2)(285)(7)
Charged to dry hole expense(18)(58)(131)
Ending balance$196 184 527 
Aging of Suspended Well Cost
The following table provides an aging of suspended well balances at December 31:
Millions of Dollars
202420232022
Exploratory well costs capitalized for a period of one year or less$33 — 15 
Exploratory well costs capitalized for a period greater than one year163 184 512 
Ending balance$196 184 527 
Number of projects with exploratory well costs capitalized for a period greater than one year13 14 17 
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, 2024:
Millions of Dollars
Suspended Since
Total2021-20232018-20202017 and Prior
WL4-00—Malaysia(1)
36 12 24 — 
West Willow—Alaska(2)
30 — 30 — 
PL891—Norway(2)
28 — 28 — 
Narwhal Trend—Alaska(1)
25 — 25 — 
Montney—Canada(2)
14 7 7 — 
Other of $10 million or less each(1)(2)
30 — — 30 
Total$163 19 114 30 
(1)Appraisal drilling complete; costs being incurred to assess development.
(2)Additional appraisal wells planned.