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RELATED PARTY TRANSACTIONS - Key Management Personnel Transactions (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of transactions between related parties [line items]    
Printing and legal services, outstanding balance $ 810  
Key management personnel of entity or parent [member]    
Disclosure of transactions between related parties [line items]    
Printing and legal services 13 $ 17
Printing and legal services, outstanding balance $ 0 $ 0