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FINANCIAL RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Changes in Fair Value of Derivatives (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets, beginning of year $ 895 $ 1,011
Proceeds received from settlement of derivatives (12,376) (5,127)
Payment on derivatives settled 12,379 5,236
Increase (decrease) in fair value of derivatives 238 (225)
Derivative financial assets, end of year 1,136 895
Debt derivatives    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets, beginning of year 1,121  
Derivative financial liabilities, beginning of year 11  
Proceeds received from settlement of derivatives (10,029) (3,914)
Payment on derivatives settled 9,956 3,931
Increase (decrease) in fair value of derivatives 134 6
Derivative financial assets, end of year 988 1,121
Derivative financial liabilities, end of year 72 11
Interest rate derivatives    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial liabilities, beginning of year (243)  
Derivative financial liabilities, end of year 0 (243)
Equity derivatives    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets, beginning of year 36 34
Proceeds received from settlement of derivatives 0 (3)
Payment on derivatives settled 0 0
Increase (decrease) in fair value of derivatives 18 5
Derivative financial assets, end of year 54 36
Cash flow hedges | Debt derivatives    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets, beginning of year 1,110 1,098
Proceeds received from settlement of derivatives (987) 0
Payment on derivatives settled 1,019 0
Increase (decrease) in fair value of derivatives (226) 12
Derivative financial assets, end of year 916 1,110
Cash flow hedges | Interest rate derivatives    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial liabilities, beginning of year (243) 0
Proceeds received from settlement of derivatives (112) (9)
Payment on derivatives settled 165 0
Increase (decrease) in fair value of derivatives 190 (234)
Derivative financial liabilities, end of year 0 (243)
Cash flow hedges | Expenditure derivatives    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets, beginning of year (19) (109)
Derivative financial liabilities, beginning of year 19  
Proceeds received from settlement of derivatives (1,248) (1,201)
Payment on derivatives settled 1,239 1,305
Increase (decrease) in fair value of derivatives 122 (14)
Derivative financial assets, end of year   (19)
Derivative financial liabilities, end of year 94 19
Before Offset Amount    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets, beginning of year 1,551  
Derivative financial liabilities, beginning of year (656)  
Derivative financial assets, end of year 1,550 1,551
Derivative financial liabilities, end of year (414) (656)
Before Offset Amount | Debt derivatives    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets, beginning of year 11 (12)
Derivative financial liabilities, beginning of year 0  
Derivative financial assets, end of year (72) 11
Derivative financial liabilities, end of year 0 0
Before Offset Amount | Interest rate derivatives    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial liabilities, end of year 0  
Before Offset Amount | Equity derivatives    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets, beginning of year 36  
Derivative financial liabilities, beginning of year 0  
Derivative financial assets, end of year 54 36
Derivative financial liabilities, end of year 0 0
Before Offset Amount | Cash flow hedges | Debt derivatives    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets, beginning of year 1,453  
Derivative financial liabilities, beginning of year (343)  
Derivative financial assets, end of year 1,330 1,453
Derivative financial liabilities, end of year (414) (343)
Before Offset Amount | Cash flow hedges | Interest rate derivatives    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets, beginning of year 40  
Derivative financial liabilities, beginning of year (283)  
Derivative financial assets, end of year 0 40
Derivative financial liabilities, end of year   (283)
Before Offset Amount | Cash flow hedges | Expenditure derivatives    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets, beginning of year 11  
Derivative financial liabilities, beginning of year (30)  
Derivative financial assets, end of year 94 11
Derivative financial liabilities, end of year $ 0 $ (30)