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Description of Business and Segmented Disclosures - Schedule of Revenues by Product (Detail) - CAD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Upstream        
Revenue $ 14,577 $ 17,471 $ 39,070 $ 52,834
U.S. Manufacturing        
Consolidated 14,577 17,471 39,070 52,834
Corporate and Eliminations        
Upstream        
Revenue (2,729) (2,426) (6,069) (5,772)
U.S. Manufacturing        
Corporate and Eliminations (2) (2,729) (2,426) (6,069) (5,772)
Consolidated (2,729) (2,426) (6,069) (5,772)
Upstream        
Upstream        
Crude Oil 6,666 7,384 17,671 24,143
Natural Gas (2) 563 973 1,975 2,740
NGLs 382 571 1,088 1,684
Other 37 96 183 331
Revenue 7,648 9,024 20,917 28,898
Canadian Manufacturing        
Synthetic Crude Oil 6,666 7,384 17,671 24,143
U.S. Manufacturing        
Consolidated 7,648 9,024 20,917 28,898
Downstream        
Upstream        
Revenue 9,658 10,873 24,222 29,708
U.S. Manufacturing        
Consolidated 9,658 10,873 24,222 29,708
Downstream | Canadian Manufacturing        
Upstream        
Crude Oil 657 657 1,607 1,786
Canadian Manufacturing        
Synthetic Crude Oil 657 657 1,607 1,786
Diesel 460 567 1,286 1,544
Gasoline 162 298 410 837
Asphalt 200 248 431 482
Other Products and Services 326 398 942 1,371
U.S. Manufacturing        
Gasoline 162 298 410 837
Distillates 460 567 1,286 1,544
Asphalt 200 248 431 482
Other Products (2) 326 398 942 1,371
Downstream | U.S. Manufacturing        
Canadian Manufacturing        
Diesel 2,871 3,384 7,169 8,535
Gasoline 3,822 3,919 9,336 11,180
Asphalt 326 196 610 402
Other Products and Services 834 1,206 2,431 3,571
U.S. Manufacturing        
Gasoline 3,822 3,919 9,336 11,180
Distillates 2,871 3,384 7,169 8,535
Asphalt 326 196 610 402
Other Products (2) $ 834 $ 1,206 $ 2,431 $ 3,571