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RELATED PARTY TRANSACTIONS - Key Management Personnel Transactions (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of transactions between related parties [line items]    
Printing and legal services, outstanding balance $ 575  
Key management personnel of entity or parent    
Disclosure of transactions between related parties [line items]    
Printing and legal services 6 $ 13
Printing and legal services, outstanding balance $ 0 $ 0