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RELATED PARTY TRANSACTIONS - Subsidiary Transactions (Details) - Subsidiaries - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of transactions between related parties [line items]    
Revenue $ 69 $ 86
Purchases 212 197
Accounts receivable 86 99
Accounts payable and accrued liabilities $ 24 $ 20