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Segmented Information - Capital Expenditures (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Exploration and evaluation assets      
Net expenditures $ 164 $ 282  
Non-cash and fair value changes (221) (277)  
Capitalized costs (57) 5  
Property, plant and equipment      
Net expenditures 6,661 4,175  
Non-cash and fair value changes (64) (1,211)  
Capitalized costs 6,597 2,964  
Head office      
Property, plant and equipment      
Net expenditures 34 21  
Non-cash and fair value changes (3) 0  
Capitalized costs 31 21  
North America      
Property, plant and equipment      
Gain on sale of exploration and evaluation assets   16 $ 35
Construction in progress   1,424  
North America | Operating segments      
Exploration and evaluation assets      
Net expenditures 129 118  
Non-cash and fair value changes (219) (52)  
Capitalized costs (90) 66  
Property, plant and equipment      
Net expenditures 4,702 2,553  
Non-cash and fair value changes 918 (362)  
Capitalized costs 5,620 2,191  
North Sea | Operating segments      
Exploration and evaluation assets      
Net expenditures 0 0  
Non-cash and fair value changes 0 0  
Capitalized costs 0 0  
Property, plant and equipment      
Net expenditures 196 131  
Non-cash and fair value changes 153 (597)  
Capitalized costs 349 (466)  
Offshore Africa | Operating segments      
Exploration and evaluation assets      
Net expenditures 35 (54)  
Non-cash and fair value changes (2) 0  
Capitalized costs 33 (54)  
Property, plant and equipment      
Net expenditures 194 228  
Non-cash and fair value changes (1,476) (86)  
Capitalized costs (1,282) 142  
Oil Sands Mining and Upgrading      
Property, plant and equipment      
Construction in progress 115    
Oil Sands Mining and Upgrading | Operating segments      
Exploration and evaluation assets      
Net expenditures 0 218  
Non-cash and fair value changes 0 (225)  
Capitalized costs 0 (7)  
Property, plant and equipment      
Net expenditures 1,525 1,229  
Non-cash and fair value changes 344 (166)  
Capitalized costs 1,869 1,063  
Exploration and Production | Operating segments      
Property, plant and equipment      
Net expenditures 5,092 2,912  
Non-cash and fair value changes (405) (1,045)  
Capitalized costs 4,687 1,867  
Midstream and Refining | Operating segments      
Property, plant and equipment      
Net expenditures 10 13  
Non-cash and fair value changes 0 0  
Capitalized costs 10 13  
Devon | North America | Operating segments      
Exploration and evaluation assets      
Net expenditures 3,126    
Exploration and evaluation assets | Oil Sands Mining and Upgrading | Operating segments      
Exploration and evaluation assets      
Net expenditures   222  
Exploration and evaluation assets | Devon | North America | Operating segments      
Exploration and evaluation assets      
Net expenditures 91    
Contingent liability for decommissioning, restoration and rehabilitation costs | Oil Sands Mining and Upgrading | Operating segments      
Exploration and evaluation assets      
Net expenditures   $ 4  
GABON | Offshore Africa | Operating segments      
Property, plant and equipment      
Disposals, property, plant and equipment $ (1,515)