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RELATED PARTY TRANSACTIONS - Key Management Personnel Transactions (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of transactions between related parties [line items]    
Printing and legal services, outstanding balance $ 617  
Key management personnel of entity or parent    
Disclosure of transactions between related parties [line items]    
Printing and legal services $ 3 $ 4
Printing and legal services, outstanding balance   $ 1