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Property, Plant and Equipment - Narrative (Details) - CAD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Mar. 24, 2021
Oct. 06, 2020
Jun. 27, 2019
Disclosure of detailed information about property, plant and equipment [line items]            
Interest costs capitalized $ 24,000,000 $ 53,000,000 $ 69,000,000      
Weighted average capitalization rate 3.50% 4.00% 3.90%      
Revenue $ 16,893,000,000 $ 22,871,000,000 $ 21,027,000,000      
Revenue net of blending, production, transportation, and feedstock expense   11,895,000,000        
Return of asset retirement obligations upon disposal of property     69,000,000      
Disposals of property, plant and equipment pre-tax gain     20,000,000      
Disposals of property, plant and equipment after-tax gain     14,000,000      
North America            
Disclosure of detailed information about property, plant and equipment [line items]            
Net cash paid for consideration for acquisition of exploration and evaluation assets   80,000,000 170,000,000      
Asset retirement obligations   20,000,000 13,000,000      
Deferred tax liabilities   0 0      
Gains on acquisitions of property, plant and equipment, pre-tax   0 47,000,000      
North Sea            
Disclosure of detailed information about property, plant and equipment [line items]            
Asset retirement obligations     41,000,000      
Deferred tax liabilities     27,000,000      
Gains on acquisitions of property, plant and equipment, pre-tax     120,000,000      
Property, plant and equipment acquisition     108,000,000      
Net proceeds received for acquisition of property, plant and equipment     73,000,000      
Net working capital assets recognised, property, plant and equipment acquisition     7,000,000      
Revaluation pre-tax gain     $ 19,000,000      
Oil Sands Mining and Upgrading            
Disclosure of detailed information about property, plant and equipment [line items]            
Project costs not subject to depletion and depreciation 117,000,000 115,000,000        
Devon            
Disclosure of detailed information about property, plant and equipment [line items]            
Total purchase consideration   3,412,000,000       $ 3,412,000,000
Revenue of acquiree since acquisition date   1,540,000,000        
Revenue net of blending, production, transportation, and feedstock expense   590,000,000        
Asset retirement obligations           178,000,000
Painted Pony Energy Ltd            
Disclosure of detailed information about property, plant and equipment [line items]            
Less: cash consideration         $ 111,000,000  
Total purchase consideration         111,000,000  
Asset retirement obligations         $ 13,000,000  
Non-revolving term credit facility maturing June 2022            
Disclosure of detailed information about property, plant and equipment [line items]            
Maximum credit facility $ 3,088,000,000 $ 3,250,000,000   $ 2,725,000,000   $ 3,250,000,000