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RELATED PARTY TRANSACTIONS - Subsidiary Transactions (Details) - Subsidiaries - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of transactions between related parties [line items]    
Revenue $ 26 $ 69
Purchases 121 212
Accounts receivable 92 86
Accounts payable and accrued liabilities $ 59 $ 24