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SEGMENTED INFORMATION - Capital Expenditures (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
May 31, 2017
Exploration and evaluation assets      
Net expenditures (2) $ 282 $ 317  
Non-cash and fair value changes (277) (67)  
Capitalized costs 5 250  
Property, plant and equipment      
Net expenditures (2) 4,175 12,755  
Non-cash and fair value changes (1,211) 6,029  
Capitalized costs 2,964 18,784  
Pre-tax non-cash revaluation gain 19 114  
Head office      
Property, plant and equipment      
Net expenditures (2) 21 19  
Non-cash and fair value changes 0 0  
Capitalized costs 21 19  
North America      
Property, plant and equipment      
Gain on sale of exploration and evaluation assets 16 35  
North America | Operating segments      
Exploration and evaluation assets      
Net expenditures (2) 118 160  
Non-cash and fair value changes (52) (184)  
Capitalized costs 66 (24)  
Property, plant and equipment      
Net expenditures (2) 2,553 2,815  
Non-cash and fair value changes (362) 354  
Capitalized costs 2,191 3,169  
North Sea      
Property, plant and equipment      
Pre-tax non-cash revaluation gain 19    
North Sea | Operating segments      
Exploration and evaluation assets      
Net expenditures (2) 0 0  
Non-cash and fair value changes 0 0  
Capitalized costs 0 0  
Property, plant and equipment      
Net expenditures (2) 131 160  
Non-cash and fair value changes (597) 95  
Capitalized costs (466) 255  
Offshore Africa | Operating segments      
Exploration and evaluation assets      
Net expenditures (2) (54) 15  
Non-cash and fair value changes 0 0  
Capitalized costs (54) 15  
Property, plant and equipment      
Net expenditures (2) 228 89  
Non-cash and fair value changes (86) 12  
Capitalized costs 142 101  
Oil Sands Mining and Upgrading | Operating segments      
Exploration and evaluation assets      
Net expenditures (2) 218 142  
Non-cash and fair value changes (225) 117  
Capitalized costs (7) 259  
Property, plant and equipment      
Net expenditures (2) 1,229 9,592  
Non-cash and fair value changes (166) 5,454  
Capitalized costs 1,063 15,046  
Exploration and Production | Operating segments      
Property, plant and equipment      
Net expenditures (2) 2,912 3,064  
Non-cash and fair value changes (1,045) 461  
Capitalized costs 1,867 3,525  
Midstream      
Property, plant and equipment      
Pre-tax non-cash revaluation gain 114 114  
After-tax non-cash revaluation gain 83 83  
Midstream | Operating segments      
Property, plant and equipment      
Net expenditures (2) 13 80  
Non-cash and fair value changes 0 114  
Capitalized costs $ 13 194  
AOSP      
Property, plant and equipment      
Non-cash share considerations issued on the acquisition of AOSP and other assets   $ 3,818 $ 3,818