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Leases - Summary of Lease Liabilities (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Feb. 28, 2023
Dec. 31, 2022
Disclosure of detailed information about business combination [line items]        
Lease liabilities $ 2,927 $ 2,658   $ 2,836
Acquisitions 0 33    
Additions 363 57    
Interest Expense – Lease Liabilities (Note 17) 162 161    
Lease Payments (461) (449)    
Divestitures 0 (11)    
Increase Decrease Of Lease Liabilities Through Foreign Currency Translation And Other 205 31    
Lease Liabilities 359 299    
Lease Liabilities $ 2,568 $ 2,359    
BP-Husky Refining LLC        
Disclosure of detailed information about business combination [line items]        
Lease liabilities     $ 11