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FINANCIAL INSTRUMENTS - Estimated fair values of derivative financial instruments included in risk management asset (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Reconciliation Of Changes In Derivative Financial Assets (Liabilities), Net [Roll Forward]      
Derivative financial asset (liability), net $ 101 $ 489  
Net change in fair value of outstanding derivatives financial instruments recognized in: Risk management activities 35 (37) $ (25)
Net change in fair value of outstanding derivatives financial instruments recognized in: Foreign exchange 260 (375)  
Net change in fair value of outstanding derivatives financial instruments recognized in: Other comprehensive income (loss) (40) 24  
Derivative financial asset (liability), net 356 101 $ 489
Asset (liability), included in current portion of other long-term (liabilities) assets 75 (103)  
Asset (liability), included in other long-term assets $ 281 $ 204