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Investments in associates and joint ventures (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of associates [line items]    
Assets $ 73,485 $ 71,940
Liabilities (56,125) (51,383)
BCE's share of net assets 341 323
BCE’s share of net liabilities 0 (252)
Revenues 24,409 24,673
Net earnings 375 2,327
BCE’s share of net losses (247) (581)
Total for all joint ventures | Total for all associates    
Disclosure of associates [line items]    
BCE's share of net assets 341 323
BCE’s share of net liabilities 0 (252)
BCE’s share of net losses (237) (553)
Associates and Joint Ventures    
Disclosure of associates [line items]    
Assets 1,531 4,050
Liabilities (796) (3,875)
Total net assets 735 175
Revenues 2,426 2,722
Expenses (2,906) (3,832)
Net earnings $ (480) $ (1,110)