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RELATED PARTY TRANSACTIONS - Key Management Personnel Compensation (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Related Party [Abstract]    
Salaries and other short-term employee benefits $ 15 $ 13
Post-employment benefits 2 2
Stock-based compensation 20 18
Total compensation $ 37 $ 33