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RELATED PARTY TRANSACTIONS - Key Management Personnel Compensation (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Related Party [Abstract]    
Salaries and other short-term employee benefits $ 13 $ 19
Post-employment benefits 11 4
Stock-based compensation 23 21
Total compensation $ 47 $ 44