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Acquisitions - Narrative (Details)
$ in Millions, $ in Millions
 3 Months Ended 7 Months Ended 9 Months Ended
Feb. 28, 2023
CAD ($)
Aug. 31, 2022
Feb. 28, 2022
CAD ($)
Sep. 30, 2023
CAD ($)
Sep. 30, 2022
CAD ($)
Sep. 30, 2023
CAD ($)
Sep. 30, 2023
CAD ($)
Sep. 30, 2022
CAD ($)
Feb. 28, 2023
USD ($)
BP-Husky Refining LLC                  
Disclosure of detailed information about business combination [line items]                  
Agreement to purchase remaining ownership 50.00%                
Total Purchase Consideration $ 502               $ 369
Accounts Receivable and Accrued Revenues 3                
Fair Value of Pre-Existing 50 Percent Ownership Interest in Toledo 494                
Carrying value of investment in joint ventures recognised​ as of​ acquisition​ date 539                
Non-cash revaluation loss, before tax 33                
Non-cash revaluation loss, after tax     $ 22            
Non-cash revaluation loss, cumulative foreign exchange $ 12                
Integration costs       $ 10 $ 0   $ 38 $ 0  
Transaction Costs       $ 2 $ 2   11 $ 2  
Revenue of acquiree since acquisition date           $ 2,400      
Profit (loss) of acquiree since acquisition date           $ (84)      
Revenue of combined entity as if combination occurred at beginning of period             39,100    
Profit (loss) of combined entity as if combination occurred at beginning of period             $ 3,300    
Sunrise Oil Sands Partnership                  
Disclosure of detailed information about business combination [line items]                  
Agreement to purchase remaining ownership   50.00%