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ACCOUNTS RECEIVABLE - Accounts Receivable (Details) - CAD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Disclosure of detailed information about financial instruments [line items]    
Total accounts receivable $ 5,070 $ 4,701
Current 4,184 3,847
Long-term 886 854
Gross carrying amount    
Disclosure of detailed information about financial instruments [line items]    
Customer accounts receivable 4,417 4,150
Other accounts receivable 835 791
Allowance for doubtful accounts    
Disclosure of detailed information about financial instruments [line items]    
Total accounts receivable $ 182 $ 240