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SHORT-TERM BORROWINGS - Non-Revolving Credit Facility (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2023
CAD ($)
borrowing
Dec. 31, 2022
CAD ($)
Nov. 30, 2023
CAD ($)
borrowing
Mar. 31, 2023
USD ($)
Credit facilities        
Disclosure of detailed information about borrowings [line items]        
Maximum borrowing capacity $ 500,000,000 $ 1,000,000,000 $ 2,000,000,000  
Repayments of short-term borrowings 3,628,000,000 1,002,000,000    
Proceeds received from short-term borrowings $ 3,241,000,000 865,000,000    
Borrowings, Number Of Borrowings Entered Into | borrowing     3  
Borrowings, Number Of Borrowings Terminated | borrowing 2      
Non-Revolving Credit Facility, Maturing In 2023        
Disclosure of detailed information about borrowings [line items]        
Maximum borrowing capacity   375,000,000    
Borrowings   375,000,000   $ 459
Non-Revolving Credit Facility, Maturing In 2024        
Disclosure of detailed information about borrowings [line items]        
Maximum borrowing capacity   375,000,000    
Non-Revolving Credit Facility, Maturing One Year When Drawn        
Disclosure of detailed information about borrowings [line items]        
Maximum borrowing capacity   $ 250,000,000