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SHORT-TERM BORROWINGS - Accounts Receivable Securitization (Details) - CAD ($)
$ in Millions
Dec. 31, 2022
Oct. 31, 2022
May 31, 2022
Mar. 31, 2022
Mar. 01, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about borrowings [line items]              
Short-term borrowings from buyer $ (2,985)         $ (2,200)  
Receivables securitization program              
Disclosure of detailed information about borrowings [line items]              
Trade receivables, maximum commitment 2,400 $ 2,400 $ 2,000 $ 1,800 $ 1,200 1,200  
Receivables sold to buyer as security 2,914         2,679  
Short-term borrowings from buyer (2,400)         (800) $ (650)
Overcollateralization $ 514         $ 1,879