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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, 2022
Dec. 31, 2021
Disclosure of detailed information about hedging instruments [line items]    
Total payments on debt derivatives $ (12,379) $ (5,236)
Net proceeds (payments) on settlement of debt derivatives (11) (8)
Debt derivatives    
Disclosure of detailed information about hedging instruments [line items]    
Total proceeds on debt derivatives 11,016 3,914
Total payments on debt derivatives (10,975) (3,931)
Net proceeds (payments) on settlement of debt derivatives 41 (17)
Net payments on settlement of debt derivatives and forward contracts 11 8
Debt derivatives | US commercial paper program    
Disclosure of detailed information about hedging instruments [line items]    
Total proceeds on debt derivatives 9,522 2,911
Total payments on debt derivatives (9,458) (2,926)
Proceeds on Canadian dollar-denominated interest rate derivatives 113 9
Payments on US dollar-denominated Interest rate derivatives (165) 0
Debt derivatives | Credit facilities    
Disclosure of detailed information about hedging instruments [line items]    
Total proceeds on debt derivatives 507 1,003
Total payments on debt derivatives (498) (1,005)
Debt derivatives | Senior notes    
Disclosure of detailed information about hedging instruments [line items]    
Total proceeds on debt derivatives 987 0
Total payments on debt derivatives $ (1,019) $ 0