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INVESTMENTS - Narrative (Details) - CAD
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Interests in Other Entities [Abstract]    
Losses on available-for-sale financial assets CAD 0 CAD 0
Gains on available-for-sale financial assets CAD (418,000,000) CAD (81,000,000)
Maple Leaf Sports and Entertainment Limited (MLSE)    
Disclosure of joint ventures [line items]    
Proportion of ownership interest 37.50%  
Glentel    
Disclosure of joint ventures [line items]    
Proportion of ownership interest 50.00%  
Parent Company and BCE, Inc. | Maple Leaf Sports and Entertainment Limited (MLSE)    
Disclosure of joint ventures [line items]    
Proportion of ownership interest 75.00%  
BCE Inc. | Glentel    
Disclosure of joint ventures [line items]    
Proportion of ownership interest 50.00%