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Debt due within one year - Narrative (Details) - CAD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of detailed information about borrowings [line items]      
Securitized trade receivables, maximum amount available   $ 2,300,000,000 $ 1,300,000,000
Commercial paper      
Disclosure of detailed information about borrowings [line items]      
Maximum borrowing capacity $ 3,000,000,000    
Unsecured revolving credit facility and expansion facility      
Disclosure of detailed information about borrowings [line items]      
Maximum borrowing capacity 3,500,000,000    
Total non-committed credit facilities      
Disclosure of detailed information about borrowings [line items]      
Maximum borrowing capacity 2,953,000,000    
Total non-committed credit facilities | Bell Mobility Inc.      
Disclosure of detailed information about borrowings [line items]      
Maximum borrowing capacity 794,000,000    
Borrowings, uncommitted trade loan agreement $ 600,000,000    
Borrowings maturity, term 24 months