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Related party transactions - Summary of Significant Subsidiaries (Details) - Subsidiary
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Bell Canada    
Disclosure of transactions between related parties [line items]    
Ownership percentage 100.00% 100.00%
Bell Mobility Inc.    
Disclosure of transactions between related parties [line items]    
Ownership percentage 100.00% 100.00%
Bell Media Inc.    
Disclosure of transactions between related parties [line items]    
Ownership percentage 100.00% 100.00%