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OTHER LONG-TERM LIABILITIES - Segmented Asset Retirement Obligations (Details) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of operating segments [line items]        
Asset retirement obligations $ 3,886 $ 4,327 $ 3,243 $ 2,950
North America        
Disclosure of operating segments [line items]        
Asset retirement obligations 1,665 1,840    
North Sea        
Disclosure of operating segments [line items]        
Asset retirement obligations 707 755    
Offshore Africa        
Disclosure of operating segments [line items]        
Asset retirement obligations 134 245    
Oil Sands Mining and Upgrading        
Disclosure of operating segments [line items]        
Asset retirement obligations 1,379 1,486    
Midstream        
Disclosure of operating segments [line items]        
Asset retirement obligations $ 1 $ 1