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Property, Plant and Equipment, Net - Assets Under Construction (Details) - CAD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Disclosure of detailed information about property, plant and equipment [line items]    
Property Plant and Equipment Temporarily Idle $ 2,279 $ 3,358
Development and Production    
Disclosure of detailed information about property, plant and equipment [line items]    
Property Plant and Equipment Temporarily Idle 2,142 2,415
Refining equipment    
Disclosure of detailed information about property, plant and equipment [line items]    
Property Plant and Equipment Temporarily Idle $ 137 $ 943