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STOCK-BASED COMPENSATION - Summary of Stock-based Compensation Expense (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Total stock-based compensation expense $ 60 $ 70
Stock options    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Total stock-based compensation expense (1) 1
Restricted share units    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Total stock-based compensation expense 49 47
Deferred share units    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Total stock-based compensation expense (3) 4
Equity derivative effect, net of interest receipt    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Total stock-based compensation expense $ 15 $ 18