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ACQUISITION OF INTERESTS IN THE ATHABASCA OIL SANDS PROJECT AND OTHER ASSETS - Narrative (Details)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2017
CAD ($)
Dec. 31, 2016
CAD ($)
Dec. 31, 2015
CAD ($)
May 31, 2017
USD ($)
shares
May 31, 2017
CAD ($)
shares
Disclosure of detailed information about business combination [line items]          
Borrowings $ 22,458,000,000 $ 16,805,000,000      
Revenue 16,651,000,000 $ 10,523,000,000 $ 12,363,000,000    
Non-revolving term credit facility maturing May 2020          
Disclosure of detailed information about business combination [line items]          
Borrowings 3,000,000,000        
Non-revolving term loan facility 3,000,000,000        
AOSP          
Disclosure of detailed information about business combination [line items]          
Interest acquired       70.00% 70.00%
Total purchase consideration         $ 12,541,000,000
Cash transferred         $ 8,217,000,000
Common shares issued (in shares) | shares       97.6 97.6
Fair value of share considerations issued 3,818,000,000       $ 3,818,000,000
Deferred purchase consideration payable       $ 375 506,000,000
Gain on acquisition, net of transaction costs 230,000,000        
Acquisition related transaction costs 3,000,000        
Revenue attributable to acquisition 2,872,000,000        
Revenue 16,651,000,000        
Net operating income attributable to acquisition 1,166,000,000        
Net operating income 8,138,000,000        
Pro forma revenue attributable to acquiree 2,181,000,000        
Pro forma revenue as if combination occurred at beginning of period 18,832,000,000        
Pro forma net operating income attributable to acquiree 735,000,000        
Pro forma net operating income as if combination occurred at beginning of period $ 8,873,000,000        
AOSP | Medium-term notes          
Disclosure of detailed information about business combination [line items]          
Borrowings         1,800,000,000
AOSP | Long-term debt          
Disclosure of detailed information about business combination [line items]          
Borrowings       $ 3,000  
AOSP | Non-revolving term credit facility maturing May 2020          
Disclosure of detailed information about business combination [line items]          
Non-revolving term loan facility         $ 3,000,000,000
AOSP, Mining And Extraction Operations          
Disclosure of detailed information about business combination [line items]          
Interest acquired       70.00% 70.00%
AOSP, Scotford Upgrader And Quest Carbon Capture And Storage Project          
Disclosure of detailed information about business combination [line items]          
Interest acquired       70.00% 70.00%
AOSP, Peace River Thermal In Situ Operations And Cliffdale Heavy Oil Field          
Disclosure of detailed information about business combination [line items]          
Interest acquired       100.00% 100.00%