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Acquisitions - Husky Energy Inc. Narrative (Details) - CAD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Jan. 01, 2021
Dec. 31, 2020
Disclosure of detailed information about business combination [line items]        
Goodwill $ 2,923 $ 3,473   $ 2,272
Non-current assets held for sale        
Disclosure of detailed information about business combination [line items]        
Goodwill   88    
Oil Sands        
Disclosure of detailed information about business combination [line items]        
Goodwill 2,923 3,473    
Sunrise        
Disclosure of detailed information about business combination [line items]        
Goodwill $ 0 $ 550    
Husky Energy, Inc.        
Disclosure of detailed information about business combination [line items]        
Goodwill recognised as of acquisition date     $ 1,289  
Husky Energy, Inc. | Lloydminister Thermal | Oil Sands        
Disclosure of detailed information about business combination [line items]        
Goodwill     651  
Husky Energy, Inc. | Sunrise | Oil Sands        
Disclosure of detailed information about business combination [line items]        
Goodwill     550  
Husky Energy, Inc. | Tucker | Oil Sands        
Disclosure of detailed information about business combination [line items]        
Goodwill     $ 88