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Goodwill - Key assumptions used to estimate the recoverable amounts (Details)
Dec. 31, 2023
BELL CTS  
Disclosure of information for cash-generating units [line items]  
Perpetuity growth rate 1.50%
Discount rate 7.00%
Bell Media Inc.  
Disclosure of information for cash-generating units [line items]  
Perpetuity growth rate 0.70%
Discount rate 10.20%