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PROPERTY, PLANT AND EQUIPMENT - Segment breakup - (Details) - CAD ($)
$ in Millions
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about property, plant and equipment [line items]        
Property, plant and equipment.. $ 72,640 $ 72,978 $ 74,245  
Assets under construction and not subject to depreciation 5,600   4,700  
Oil Sands        
Disclosure of detailed information about property, plant and equipment [line items]        
Property, plant and equipment.. 54,665   57,641  
Exploration and Production        
Disclosure of detailed information about property, plant and equipment [line items]        
Property, plant and equipment.. 7,578   7,792  
Refining and Marketing        
Disclosure of detailed information about property, plant and equipment [line items]        
Property, plant and equipment.. 9,574   8,535  
Cost        
Disclosure of detailed information about property, plant and equipment [line items]        
Property, plant and equipment.. 125,164   116,874 $ 114,848
Cost | Oil Sands        
Disclosure of detailed information about property, plant and equipment [line items]        
Property, plant and equipment.. 85,246   80,295  
Cost | Exploration and Production        
Disclosure of detailed information about property, plant and equipment [line items]        
Property, plant and equipment.. 22,876   21,867  
Cost | Refining and Marketing        
Disclosure of detailed information about property, plant and equipment [line items]        
Property, plant and equipment.. 15,342   13,627  
Accumulated provision        
Disclosure of detailed information about property, plant and equipment [line items]        
Property, plant and equipment.. (52,524)   (42,629) (41,355)
Accumulated provision | Oil Sands        
Disclosure of detailed information about property, plant and equipment [line items]        
Property, plant and equipment.. (30,581)   (22,654)  
Accumulated provision | Exploration and Production        
Disclosure of detailed information about property, plant and equipment [line items]        
Property, plant and equipment.. (15,298)   (14,075)  
Accumulated provision | Refining and Marketing        
Disclosure of detailed information about property, plant and equipment [line items]        
Property, plant and equipment.. (5,768)   (5,092)  
Oil and Gas properties        
Disclosure of detailed information about property, plant and equipment [line items]        
Property, plant and equipment.. 18,207   18,062  
Oil and Gas properties | Cost        
Disclosure of detailed information about property, plant and equipment [line items]        
Property, plant and equipment.. 40,596   37,845 36,209
Oil and Gas properties | Accumulated provision        
Disclosure of detailed information about property, plant and equipment [line items]        
Property, plant and equipment.. (22,389)   (19,783) (17,975)
Plant and Equipment        
Disclosure of detailed information about property, plant and equipment [line items]        
Property, plant and equipment.. 54,433   56,183  
Plant and Equipment | Cost        
Disclosure of detailed information about property, plant and equipment [line items]        
Property, plant and equipment.. 84,568   79,029 78,639
Plant and Equipment | Accumulated provision        
Disclosure of detailed information about property, plant and equipment [line items]        
Property, plant and equipment.. (30,135)   (22,846) $ (23,380)
Corporate Energy Trading And Eliminations        
Disclosure of detailed information about property, plant and equipment [line items]        
Property, plant and equipment.. 823   277  
Corporate Energy Trading And Eliminations | Cost        
Disclosure of detailed information about property, plant and equipment [line items]        
Property, plant and equipment.. 1,700   1,085  
Corporate Energy Trading And Eliminations | Accumulated provision        
Disclosure of detailed information about property, plant and equipment [line items]        
Property, plant and equipment.. $ (877)   $ (808)