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Lease Liabilities - Summary of Lease Liabilities (Details) - CAD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Feb. 28, 2023
Dec. 31, 2022
Disclosure of quantitative information about right-of-use assets [line items]            
Beginning balance, lease liabilities     $ 2,836      
Acquisition     33      
Additions     45      
Interest Expense (Note 4) $ 41 $ 40 121 $ 123    
Lease Payments     (337)      
Modifications     34      
Re-measurements     (6)      
Divestitures     11      
Terminations     (8)      
Exchange Rate Movements and Other     26      
Ending Balance, lease liabilities 2,733   2,733      
Less: Current Portion 315   315     $ 308
Long-Term Portion 2,418   2,418     2,528
Lease liabilities $ 2,733   $ 2,733     $ 2,836
BP-Husky Refining LLC            
Disclosure of quantitative information about right-of-use assets [line items]            
Lease liabilities         $ 11