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FINANCIAL RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Net Cash Payments on Debt Derivatives (Details) - CAD ($)
$ in Millions
 1 Months Ended 12 Months Ended
Apr. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about hedging instruments [line items]      
Total payments on debt derivatives   $ (21,834) $ (13,321)
Net payments on settlement of debt derivatives and forward contracts   388 (79)
US commercial paper      
Disclosure of detailed information about hedging instruments [line items]      
Net payments on settlement of debt derivatives and forward contracts     (62)
Bank credit facilities      
Disclosure of detailed information about hedging instruments [line items]      
Net payments on settlement of debt derivatives and forward contracts     (17)
Debt derivatives and forward contracts      
Disclosure of detailed information about hedging instruments [line items]      
Total proceeds on debt derivatives   21,129 12,002
Total payments on debt derivatives   (20,741) (12,081)
Net payments on settlement of debt derivatives and forward contracts   388 (79)
Debt derivatives      
Disclosure of detailed information about hedging instruments [line items]      
Total proceeds on debt derivatives $ 326    
Debt derivatives | US commercial paper      
Disclosure of detailed information about hedging instruments [line items]      
Total proceeds on debt derivatives   19,211 9,692
Total payments on debt derivatives   (19,148) (9,754)
Debt derivatives | Bank credit facilities      
Disclosure of detailed information about hedging instruments [line items]      
Total proceeds on debt derivatives   157 2,310
Total payments on debt derivatives   (157) (2,327)
Debt derivatives | Senior notes      
Disclosure of detailed information about hedging instruments [line items]      
Total proceeds on debt derivatives   1,761 0
Total payments on debt derivatives   $ (1,436) $ 0