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Property, Plant and Equipment, Net - Assets Under Construction (Details) - CAD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about property, plant and equipment [line items]    
Property plant and equipment temporarily idle $ 3,759 $ 2,750
Crude Oil and Natural Gas Properties    
Disclosure of detailed information about property, plant and equipment [line items]    
Property plant and equipment temporarily idle 3,359 2,507
Refining Assets    
Disclosure of detailed information about property, plant and equipment [line items]    
Property plant and equipment temporarily idle $ 400 $ 243