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FINANCIAL RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Balance Sheet Classification (Details) - CAD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about financial instruments [line items]      
Current derivative financial assets $ 689 $ 120  
Non-current derivative financial assets 861 1,431  
Derivative financial assets 1,136 895 $ 1,011
Non-current derivative financial liabilities (398) (189)  
Before Offset Amount      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets 1,550 1,551  
Derivative financial liabilities $ (414) $ (656)