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Property, Plant and Equipment - by segment (Details) - CAD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Property, Plant and Equipment      
Property, plant and equipment $ 62,654 $ 65,546  
Assets under construction and not subject to depreciation 6,300 4,600  
Oil Sands      
Property, Plant and Equipment      
Property, plant and equipment 47,313 49,878  
Exploration and Production      
Property, Plant and Equipment      
Property, plant and equipment 5,181 5,496  
Refining and Marketing      
Property, Plant and Equipment      
Property, plant and equipment 9,666 9,393  
Corporate and Eliminations      
Property, Plant and Equipment      
Property, plant and equipment 494 779  
Cost      
Property, Plant and Equipment      
Property, plant and equipment 127,209 126,559 $ 127,658
Cost | Oil Sands      
Property, Plant and Equipment      
Property, plant and equipment 92,601 87,849  
Cost | Exploration and Production      
Property, Plant and Equipment      
Property, plant and equipment 16,541 21,495  
Cost | Refining and Marketing      
Property, Plant and Equipment      
Property, plant and equipment 17,101 15,989  
Cost | Corporate and Eliminations      
Property, Plant and Equipment      
Property, plant and equipment 966 1,226  
Accumulated provision      
Property, Plant and Equipment      
Property, plant and equipment (64,555) (61,013) $ (59,528)
Accumulated provision | Oil Sands      
Property, Plant and Equipment      
Property, plant and equipment (45,288) (37,971)  
Accumulated provision | Exploration and Production      
Property, Plant and Equipment      
Property, plant and equipment (11,360) (15,999)  
Accumulated provision | Refining and Marketing      
Property, Plant and Equipment      
Property, plant and equipment (7,435) (6,596)  
Accumulated provision | Corporate and Eliminations      
Property, Plant and Equipment      
Property, plant and equipment $ (472) $ (447)