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RELATED PARTY TRANSACTIONS - Subsidiary Transactions (Details) - Subsidiaries - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of transactions between related parties [line items]    
Revenue $ 86 $ 74
Purchases 197 198
Accounts receivable 99 80
Accounts payable and accrued liabilities $ 20 $ 26