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Inventories - Schedule of Inventories (Detail) - CAD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Disclosure of inventories [line items]    
Total Product $ 4,009 $ 3,651
Parts and supplies 303 268
Current inventories 4,312 3,919
Crude Oil    
Disclosure of inventories [line items]    
Total Product 2,424 2,060
Diluent    
Disclosure of inventories [line items]    
Total Product 366 515
Natural Gas and NGLs    
Disclosure of inventories [line items]    
Total Product 50 33
Refined Products    
Disclosure of inventories [line items]    
Total Product $ 1,169 $ 1,043