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SHAREHOLDERS' EQUITY - Normal Course Issuer Bid (Details) - CAD ($)
 12 Months Ended
Dec. 31, 2019
Apr. 30, 2020
Apr. 30, 2019
Disclosure of classes of share capital [line items]      
Shares repurchased $ 655,000,000    
Class B Non-Voting Shares      
Disclosure of classes of share capital [line items]      
Number of shares purchased (in shares) 9,900,000    
Shares repurchased $ 655,000,000    
2020 NCIB | Class B Non-Voting Shares      
Disclosure of classes of share capital [line items]      
Authorized amount (in shares)   34,900,000  
Authorized amount   $ 500,000,000  
2019 NCIB | Class B Non-Voting Shares      
Disclosure of classes of share capital [line items]      
Authorized amount (in shares)     35,700,000
Authorized amount     $ 500,000,000
Number of shares purchased (in shares) 7,700,000    
Shares repurchased $ 500,000,000    
2018 NCIB | Class B Non-Voting Shares      
Disclosure of classes of share capital [line items]      
Number of shares purchased (in shares) 2,200,000    
Shares repurchased $ 155,000,000