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Segmented Information - Capital Expenditures (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Oct. 06, 2020
Jun. 27, 2019
Exploration and evaluation assets        
Net  expenditures $ 5 $ 164    
Non-cash and fair value changes (147) (221)    
Capitalized  costs (142) (57)    
Property, plant and    equipment        
Net expenditures 2,555 6,661    
Non-cash and fair value changes (271) (64)    
Capitalized  costs 2,284 6,597    
Head office        
Property, plant and    equipment        
Net expenditures 19 34    
Non-cash and fair value changes 0 (3)    
Capitalized  costs 19 31    
North America | Operating segments        
Exploration and evaluation assets        
Net  expenditures (7) 129    
Non-cash and fair value changes (150) (219)    
Capitalized  costs (157) (90)    
Property, plant and    equipment        
Net expenditures 999 4,702    
Non-cash and fair value changes 371 918    
Capitalized  costs 1,370 5,620    
North Sea | Operating segments        
Property, plant and    equipment        
Net expenditures 122 196    
Non-cash and fair value changes (21) 153    
Capitalized  costs 101 349    
Offshore Africa | Operating segments        
Exploration and evaluation assets        
Net  expenditures 12 35    
Non-cash and fair value changes 3 (2)    
Capitalized  costs 15 33    
Property, plant and    equipment        
Net expenditures 87 194    
Non-cash and fair value changes 7 (1,476)    
Capitalized  costs 94 (1,282)    
Exploration and    Production | Operating segments        
Property, plant and    equipment        
Net expenditures 1,208 5,092    
Non-cash and fair value changes 357 (405)    
Capitalized  costs 1,565 4,687    
Oil Sands Mining and Upgrading | Operating segments        
Property, plant and    equipment        
Net expenditures 1,323 1,525    
Non-cash and fair value changes (629) 344    
Capitalized  costs 694 1,869    
Midstream and Refining | Operating segments        
Property, plant and    equipment        
Net expenditures 5 10    
Non-cash and fair value changes 1 0    
Capitalized  costs $ 6 10    
Devon        
Property, plant and    equipment        
Total purchase consideration   3,412   $ 3,412
Devon | North America | Operating segments        
Exploration and evaluation assets        
Net  expenditures   3,126    
Painted Pony Energy Ltd        
Property, plant and    equipment        
Total purchase consideration     $ 111  
Exploration and evaluation assets | Devon | North America | Operating segments        
Exploration and evaluation assets        
Net  expenditures   91    
GABON | Offshore Africa | Operating segments        
Property, plant and    equipment        
Disposals, property, plant and equipment   $ 1,515