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Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 31, 2021
Property, Plant and Equipment [Abstract]  
Schedule of Property, Plant and Equipment
December 31, 2021December 31, 2020
(Thousands of dollars)CostNetCostNet
Exploration and production ¹$20,440,568 8,098,396 
2
19,583,682 8,232,191 
2
Corporate and other145,135 29,456 140,661 36,847 
Property, plant and equipment$20,585,703 8,127,852 19,724,343 8,269,038 
¹  Includes unproved mineral rights as follows:$615,724 131,107 649,704 530,194 
2  Includes $22,543 in 2021 and $22,940 in 2020 related to administrative assets and support equipment.
Schedule of Recognized Impairments The following table reflects the recognized before tax impairments for the three years ended December 31, 2021.
December 31,
(Thousands of dollars)202120202019
Canada$171,296 — — 
Other Foreign18,000 39,709 — 
Corporate7,000 14,060 — 
U.S.— 1,152,515 — 
$196,296 1,206,284 — 
Net Changes in Capitalized Exploratory Well Costs The following table reflects the net changes in capitalized exploratory well costs during the three-year period ended December 31, 2021.
(Thousands of dollars)
202120202019
Beginning balance at January 1$181,616 217,326 207,855 
Additions pending the determination of proved reserves16,725 3,999 83,712 
Reclassifications to proved properties based on the determination of proved reserves— — (61,096)
Capitalized exploration well costs charged to expense(18,860)(39,709)(13,145)
Ending balance at December 31$179,481 181,616 217,326 
Aging of Capitalized Exploratory Well Costs
The following table provides an aging of capitalized exploratory well costs based on the date the drilling was completed for each individual well and the number of projects for which exploratory well costs has been capitalized.  The projects are aged based on the last well drilled in the project.
202120202019
(Thousands of dollars)
AmountNo. of
Wells		No. of
Projects		AmountNo. of
Wells		No. of
Projects		AmountNo. of
Wells		No. of
Projects
Aging of capitalized well costs:
Zero to one year$13,273 33$— ——$63,409 55
One to two years— ——54,220 55— ——
Two to three years53,070 55— ——27,396 1—
Three years or more113,138 6—127,396 6—126,521 5—
$179,481 148$181,616 115$217,326 115