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RELATED PARTY TRANSACTIONS - Key Management Personnel Compensation (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Related Party [Abstract]    
Salaries and other short-term employee benefits $ 11 $ 15
Post-employment benefits 2 2
Stock-based compensation 19 20
Total compensation $ 32 $ 37