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EXPLORATION AND EVALUATION ASSETS - Narrative (Details)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2018
USD ($)
agreement
Dec. 31, 2018
CAD ($)
agreement
Dec. 31, 2017
CAD ($)
Dec. 31, 2016
CAD ($)
Dec. 31, 2018
CAD ($)
May 31, 2017
CAD ($)
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items]            
Disposals of exploration and evaluation assets   $ 100 $ 1      
Proceeds from disposal of exploration and evaluation assets   $ 16 35 $ 35    
Farm-out agreements, working interest retained 20.00% 20.00%        
Oil Sands Mining and Upgrading            
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items]            
Disposals of exploration and evaluation assets   $ 7 0      
North America            
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items]            
Asset retirement obligations         $ 13  
Disposals of exploration and evaluation assets   4 1      
Proceeds from disposal of exploration and evaluation assets     36      
Gain on sale of exploration and evaluation assets   $ 16 35      
Offshore Africa            
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items]            
Number of farm-out agreements | agreement 2 2        
Disposals of exploration and evaluation assets   $ 89 $ 0      
Joslyn Oil Sands Project | Oil Sands Mining and Upgrading            
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items]            
Exploration and evaluation assets recognized as of acquisition date         222  
Asset retirement obligations         4  
Total purchase consideration         218  
Cash transferred         100  
Laricina Energy Ltd | North America            
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items]            
Exploration and evaluation assets recognized as of acquisition date         118  
Asset retirement obligations         17  
Total purchase consideration         46  
Property, plant and equipment         44  
Cash         24  
Deferred tax assets recognised as of acquisition date         168  
Net working capital liabilities recognised as of acquisition date         18  
Notes payable recognised as of acquisition date         $ 48  
Gain recognised on acquisition, pre-tax   $ 225        
AOSP            
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items]            
Exploration and evaluation assets recognized as of acquisition date           $ 290
Asset retirement obligations           721
Total purchase consideration           12,541
Cash transferred           8,217
Property, plant and equipment           14,181
Cash           $ 93
Farm-Out Agreements, Offshore Africa [Member] | Offshore Africa            
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items]            
Farm-out agreements, working interest disposed 30.00% 30.00%        
Disposals of exploration and evaluation assets   $ 89        
Disposals of exploration and evaluation assets, costs incurred in past fiscal year recovered   14        
Proceeds from disposal of exploration and evaluation assets $ 79 105        
Gain recognised on farm-out, pre-tax   16        
Gain recognised on farm-out, after-tax   $ 12        
Bottom of range | Crude Oil and NGLs            
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items]            
Estimated financial effect of contingent assets 623          
Bottom of range | Natural Gas            
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items]            
Estimated financial effect of contingent assets 126          
Top of range | Crude Oil and NGLs            
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items]            
Estimated financial effect of contingent assets 645          
Top of range | Natural Gas            
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items]            
Estimated financial effect of contingent assets $ 132