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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, 2019
Dec. 31, 2018
Disclosure of detailed information about hedging instruments [line items]      
Total payments on debt derivatives   $ (18,865) $ (21,834)
Net (payments) proceeds on settlement of debt derivatives   (121) 388
Debt derivatives      
Disclosure of detailed information about hedging instruments [line items]      
Total proceeds on debt derivatives $ 326 17,620 21,129
Total payments on debt derivatives   (17,630) (20,741)
Net (payments) proceeds on settlement of debt derivatives   (10) 388
Debt derivatives | US commercial paper      
Disclosure of detailed information about hedging instruments [line items]      
Total proceeds on debt derivatives   17,056 19,211
Total payments on debt derivatives   (17,069) (19,148)
Debt derivatives | Credit facilities      
Disclosure of detailed information about hedging instruments [line items]      
Total proceeds on debt derivatives   564 157
Total payments on debt derivatives   (561) (157)
Debt derivatives | Senior notes      
Disclosure of detailed information about hedging instruments [line items]      
Total proceeds on debt derivatives   0 1,761
Total payments on debt derivatives   $ 0 $ (1,436)