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RELATED PARTY TRANSACTIONS - Key Management Personnel Transactions (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of transactions between related parties [line items]    
Printing and legal services, outstanding balance $ 779  
Key management personnel of entity or parent    
Disclosure of transactions between related parties [line items]    
Printing and legal services 4 $ 6
Printing and legal services, outstanding balance $ 1 $ 0