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Description of Business and Segmented Disclosures - Schedule of Revenues by Product (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
U.S. Manufacturing      
Retail $ 46,357 $ 13,543 [1] $ 20,542 [1]
Consolidated 46,357 13,543 [1] 20,542 [1]
Corporate and Eliminations      
U.S. Manufacturing      
Retail (5,706) (609) (689)
Corporate and Eliminations (5,706) (609) (689)
Consolidated (5,706) (609) (689)
Upstream      
Upstream (2)      
Crude Oil 19,051 8,557 12,091
Natural Gas 2,809 186 227
NGLs 3,032 535 480
Other 498 58 65
Canadian Manufacturing      
Synthetic Crude Oil 19,051 8,557 12,091
Downstream | Canadian Manufacturing      
Canadian Manufacturing      
Asphalt 477 0 0
Other Products and Services 1,637 82 77
U.S. Manufacturing      
Other Products 1,637 82 77
Downstream | Canadian Manufacturing | Synthetic Oil      
Canadian Manufacturing      
Diesel and Distillate 1,951 0 0
U.S. Manufacturing      
Diesel and Distillate 1,951 0 0
Downstream | Canadian Manufacturing | Diesel and Distillate      
Canadian Manufacturing      
Diesel and Distillate 407 0 0
U.S. Manufacturing      
Diesel and Distillate 407 0 0
Downstream | U.S. Manufacturing      
Canadian Manufacturing      
Diesel and Distillate 6,429 1,569 3,127
Other Products and Services 3,503 813 1,284
U.S. Manufacturing      
Gasoline 10,111 2,352 3,880
Diesel and Distillate 6,429 1,569 3,127
Other Products 3,503 813 1,284
Downstream | Retail      
U.S. Manufacturing      
Retail 2,158 0 0
Consolidated $ 2,158 $ 0 $ 0
[1] See Note 3(w) for revisions to comparative results.