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Prior Period Revisions (Details) - CAD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Disclosure of changes in accounting estimates [line items]        
Revenues [1] $ 13,195 $ 13,819 $ 38,813 $ 41,464
Purchased Product   7,126   19,806
Transportation and Blending   2,489   7,929
Purchased Product, Transportation and Blending [1] $ 8,545 9,615 $ 25,956 27,735
Net Earnings (Loss)   4,204   13,729
U.S. Refining        
Disclosure of changes in accounting estimates [line items]        
Revenues   7,218   21,734
Purchased Product   6,854   19,473
Transportation and Blending   0   0
Purchased Product, Transportation and Blending   6,854   19,473
Net Earnings (Loss)   364   2,261
Previously Reported        
Disclosure of changes in accounting estimates [line items]        
Revenues   14,249   42,531
Purchased Product   7,556   20,873
Transportation and Blending   2,489   7,929
Purchased Product, Transportation and Blending   10,045   28,802
Net Earnings (Loss)   4,204   13,729
Previously Reported | U.S. Refining        
Disclosure of changes in accounting estimates [line items]        
Revenues   7,648   22,801
Purchased Product   7,284   20,540
Transportation and Blending   0   0
Purchased Product, Transportation and Blending   7,284   20,540
Net Earnings (Loss)   364   2,261
Revisions        
Disclosure of changes in accounting estimates [line items]        
Revenues   (430)   (1,067)
Purchased Product   (430)   (1,067)
Transportation and Blending   0   0
Purchased Product, Transportation and Blending   (430)   (1,067)
Net Earnings (Loss)   0   0
Revisions | U.S. Refining        
Disclosure of changes in accounting estimates [line items]        
Revenues   (430)   (1,067)
Purchased Product   (430)   (1,067)
Transportation and Blending   0   0
Purchased Product, Transportation and Blending   (430)   (1,067)
Net Earnings (Loss)   $ 0   $ 0
[1] Comparative periods reflect certain revisions. See Note 23.