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INVESTMENTS - Narrative (Details) - CAD ($)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Interests in Other Entities [Abstract]    
Realized losses $ 0 $ 0
Unrealized gains (losses) $ (381,000,000) $ 17,000,000
Maple Leaf Sports and Entertainment Limited (MLSE)    
Disclosure of joint ventures [line items]    
Proportion of ownership interest 37.50%  
Maple Leaf Sports and Entertainment Limited (MLSE) | Parent Company and BCE, Inc.    
Disclosure of joint ventures [line items]    
Proportion of ownership interest 75.00%  
Glentel    
Disclosure of joint ventures [line items]    
Proportion of ownership interest 50.00%  
Glentel | BCE Inc.    
Disclosure of joint ventures [line items]    
Proportion of ownership interest 50.00%