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FINANCIAL RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Net Cash Proceeds (Payments) on Debt Derivatives (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about hedging instruments [line items]    
Total payments on debt derivatives $ (8,047) $ (18,865)
Net proceeds (payments) on settlement of debt derivatives 80 (121)
Debt derivatives    
Disclosure of detailed information about hedging instruments [line items]    
Total proceeds on debt derivatives 6,906 17,620
Total payments on debt derivatives (6,826) (17,630)
Net proceeds (payments) on settlement of debt derivatives 80 (10)
Debt derivatives | Commercial paper program    
Disclosure of detailed information about hedging instruments [line items]    
Total proceeds on debt derivatives 5,542 17,056
Total payments on debt derivatives (5,441) (17,069)
Debt derivatives | Credit facilities    
Disclosure of detailed information about hedging instruments [line items]    
Total proceeds on debt derivatives 1,364 564
Total payments on debt derivatives (1,385) (561)
Debt derivatives | Senior notes    
Disclosure of detailed information about hedging instruments [line items]    
Total proceeds on debt derivatives 0 0
Total payments on debt derivatives $ 0 $ 0