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Description of Business and Segmented Disclosures - Schedule of Revenues by Product (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
U.S. Manufacturing      
Consolidated $ 66,897 $ 46,357 [1] $ 13,543 [1]
Corporate and Eliminations      
U.S. Manufacturing      
Corporate and Eliminations (7,464) (5,291) (609)
Consolidated (7,464) (5,291) (609)
Upstream      
Upstream      
Crude Oil (1) 29,834 19,877 8,017
NGLs (1) 2,346 1,983 727
Natural Gas 3,690 3,032 535
Other 389 498 58
Downstream | Canadian Manufacturing      
Canadian Manufacturing      
Asphalt 620 477 0
Other Products 4,812 3,787 82
U.S. Manufacturing      
Other Products 4,812 3,787 82
Downstream | Canadian Manufacturing | Synthetic Oil      
Canadian Manufacturing      
Synthetic Crude Oil and Diesel and Distillate 2,360 1,951 0
U.S. Manufacturing      
Diesel and Distillate 2,360 1,951 0
Downstream | U.S. Manufacturing      
Canadian Manufacturing      
Synthetic Crude Oil and Diesel and Distillate 11,453 6,429 1,569
Other Products 4,741 3,503 812
U.S. Manufacturing      
Gasoline 14,116 10,111 2,352
Diesel and Distillate 11,453 6,429 1,569
Other Products $ 4,741 $ 3,503 $ 812
[1] See Note 3X for revisions to prior period results.