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PROPERTY, PLANT AND EQUIPMENT - Narrative (Details) - CAD ($)
$ / shares in Units, shares in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
May 31, 2017
Disclosure of detailed information about property, plant and equipment [line items]        
Interest costs capitalized $ 82,000,000 $ 233,000,000 $ 244,000,000  
Weighted average capitalization rate 3.80% 3.90% 3.90%  
North America, Exploration and Production segment and Midstream segment        
Disclosure of detailed information about property, plant and equipment [line items]        
Net cash consideration for acquisition of exploration and evaluation assets $ 1,013,000,000 $ 159,000,000 $ 406,000,000  
Asset retirement obligations 63,000,000 30,000,000 133,000,000  
Deferred tax liabilities 0 0 0  
North America        
Disclosure of detailed information about property, plant and equipment [line items]        
Acquired exploration and evaluation assets 27,000,000 0 $ 37,000,000  
Midstream        
Disclosure of detailed information about property, plant and equipment [line items]        
Revaluation pre-tax gain 114,000,000      
Revaluation after-tax gain $ 83,000,000      
Pre-tax and after-tax gain on disposal of property, plant and equipment   218,000,000    
AOSP        
Disclosure of detailed information about property, plant and equipment [line items]        
Property, plant and equipment       $ 14,181,000,000
Asset retirement obligations       721,000,000
Deferred tax liabilities       1,287,000,000
AOSP | Oil Sands Mining and Upgrading segment and North America Exploration and Production segment        
Disclosure of detailed information about property, plant and equipment [line items]        
Property, plant and equipment       $ 14,181,000,000
Disposal of Cold Lake Pipeline        
Disclosure of detailed information about property, plant and equipment [line items]        
Net proceeds on sale of property, plant and equipment   349,000,000    
Disposal of Cold Lake Pipeline | Inter Pipeline        
Disclosure of detailed information about property, plant and equipment [line items]        
Non-cash share consideration received   $ 190,000,000    
Non-cash share consideration received (in shares)   6.4    
Non-cash share consideration received, price per share (in CAD per share)   $ 29.57    
Disposal of Cold Lake Pipeline | Midstream        
Disclosure of detailed information about property, plant and equipment [line items]        
Disposals of property, plant and equipment   $ 321,000,000    
Net consideration received, property, plant and equipment   539,000,000    
Pre-tax and after-tax gain on disposal of property, plant and equipment   $ 218,000,000