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RELATED PARTY TRANSACTIONS - Subsidiary Transactions (Details) - Subsidiaries - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of transactions between related parties [line items]    
Revenue $ 74 $ 31
Purchases 194 180
Accounts receivable 87 112
Accounts payable and accrued liabilities $ 138 $ 95