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SEGMENTED INFORMATION - Capital Expenditures (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
May 31, 2017
Exploration and evaluation assets      
Net expenditures (proceeds) $ 317 $ 26  
Non-cash and fair value changes (67) (229)  
Capitalized costs 250 (203)  
Property, plant and equipment      
Net expenditures (proceeds) 12,755 3,831  
Non-cash and fair value changes 6,029 (53)  
Capitalized costs 18,784 3,778  
Non-segmented      
Property, plant and equipment      
Net expenditures (proceeds) 19 17  
Non-cash and fair value changes 0 0  
Capitalized costs 19 17  
North America      
Property, plant and equipment      
Gain on sale of exploration and evaluation assets 35 32  
North America | Operating segments      
Exploration and evaluation assets      
Net expenditures (proceeds) 160 17  
Non-cash and fair value changes (184) (211)  
Capitalized costs (24) (194)  
Property, plant and equipment      
Net expenditures (proceeds) 2,815 1,143  
Non-cash and fair value changes 354 (36)  
Capitalized costs 3,169 1,107  
North Sea | Operating segments      
Exploration and evaluation assets      
Net expenditures (proceeds) 0 0  
Non-cash and fair value changes 0 0  
Capitalized costs 0 0  
Property, plant and equipment      
Net expenditures (proceeds) 160 126  
Non-cash and fair value changes 95 60  
Capitalized costs 255 186  
Offshore Africa | Operating segments      
Exploration and evaluation assets      
Net expenditures (proceeds) 15 9  
Non-cash and fair value changes 0 (18)  
Capitalized costs 15 (9)  
Property, plant and equipment      
Net expenditures (proceeds) 89 142  
Non-cash and fair value changes 12 (26)  
Capitalized costs 101 116  
Exploration and Production | Operating segments      
Property, plant and equipment      
Net expenditures (proceeds) 3,064 1,411  
Non-cash and fair value changes 461 (2)  
Capitalized costs 3,525 1,409  
Oil Sands Mining and Upgrading | Operating segments      
Exploration and evaluation assets      
Net expenditures (proceeds) 142 0  
Non-cash and fair value changes 117 0  
Capitalized costs 259 0  
Property, plant and equipment      
Net expenditures (proceeds) 9,592 2,718  
Non-cash and fair value changes 5,454 (23)  
Capitalized costs 15,046 2,695  
Midstream      
Property, plant and equipment      
Pre-tax gain on sale of properties   218  
Pre-tax non-cash revaluation gain 114    
After-tax non-cash revaluation gain 83    
Midstream | Operating segments      
Property, plant and equipment      
Net expenditures (proceeds) 80 (315)  
Non-cash and fair value changes 114 (28)  
Capitalized costs 194 $ (343)  
AOSP      
Property, plant and equipment      
Non-cash share considerations issued on the acquisition of AOSP and other assets $ 3,818   $ 3,818