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PROPERTY, PLANT AND EQUIPMENT - Narrative (Details) - CAD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
May 31, 2017
Disclosure of detailed information about property, plant and equipment [line items]          
Revaluation pre-tax gain   $ 19,000,000 $ 114,000,000    
Return of asset retirement obligations upon disposal of property $ 69,000,000 69,000,000      
Disposals of property, plant and equipment pre-tax gain 20,000,000        
Disposals of property, plant and equipment after-tax gain 14,000,000        
Interest costs capitalized   $ 69,000,000 $ 82,000,000 $ 233,000,000  
Weighted average capitalization rate   3.90% 3.80% 3.90%  
North America          
Disclosure of detailed information about property, plant and equipment [line items]          
Net cash paid for consideration for acquisition of exploration and evaluation assets   $ 170,000,000      
Asset retirement obligations 13,000,000 13,000,000      
Deferred tax liabilities 0 0      
Gains on acquisitions of property, plant and equipment, pre-tax   47,000,000      
Acquired exploration and evaluation assets     $ 27,000,000 $ 0  
North Sea          
Disclosure of detailed information about property, plant and equipment [line items]          
Asset retirement obligations 41,000,000 41,000,000      
Deferred tax liabilities 27,000,000 27,000,000      
Gains on acquisitions of property, plant and equipment, pre-tax   120,000,000      
Property, plant and equipment acquisition   108,000,000      
Net proceeds received for acquisition of property, plant and equipment   73,000,000      
Net working capital assets recognised, property, plant and equipment acquisition $ 7,000,000 7,000,000      
Revaluation pre-tax gain   19,000,000      
North America, Exploration and Production segment and Midstream segment          
Disclosure of detailed information about property, plant and equipment [line items]          
Net cash paid for consideration for acquisition of exploration and evaluation assets     1,013,000,000 159,000,000  
Asset retirement obligations     63,000,000 30,000,000  
Deferred tax liabilities     0 $ 0  
Midstream          
Disclosure of detailed information about property, plant and equipment [line items]          
Revaluation pre-tax gain   114,000,000 114,000,000    
Revaluation after-tax gain   $ 83,000,000 $ 83,000,000    
AOSP          
Disclosure of detailed information about property, plant and equipment [line items]          
Asset retirement obligations         $ 721,000,000
Deferred tax liabilities         $ 1,287,000,000