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Property, Plant and Equipment, Net - Assets Under Construction (Details) - CAD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about property, plant and equipment [line items]    
Property Plant and Equipment Temporarily Idle $ 3,358 $ 2,033
Development & Production Upstream Assets [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Property Plant and Equipment Temporarily Idle 2,415 1,807
Refining equipment    
Disclosure of detailed information about property, plant and equipment [line items]    
Property Plant and Equipment Temporarily Idle $ 943 $ 226