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Debt due within one year - Summary of Total Bank Credit Facilities (Details) - Dec. 31, 2024
$ in Millions, $ in Millions
CAD ($)
USD ($)
Unsecured revolving and expansion credit facilities    
Disclosure of detailed information about borrowings [line items]    
Total available $ 4,000  
Drawn 0  
Letters of credit 0  
Commercial paper outstanding 2,190 $ 1,522
Net available 1,810  
Unsecured term loan facility    
Disclosure of detailed information about borrowings [line items]    
Total available 5,324  
Drawn 0  
Letters of credit 0  
Commercial paper outstanding 0  
Net available 5,324  
Unsecured non-revolving credit facilities    
Disclosure of detailed information about borrowings [line items]    
Total available 641  
Drawn 52  
Letters of credit 0  
Commercial paper outstanding 0  
Net available 589  
Other    
Disclosure of detailed information about borrowings [line items]    
Total available 106  
Drawn 0  
Letters of credit 71  
Commercial paper outstanding 0  
Net available 35  
Total committed credit facilities    
Disclosure of detailed information about borrowings [line items]    
Total available 10,071  
Drawn 52  
Letters of credit 71  
Commercial paper outstanding 2,190  
Net available 7,758  
Total non-committed credit facilities    
Disclosure of detailed information about borrowings [line items]    
Total available 2,673  
Drawn 863  
Letters of credit 512  
Commercial paper outstanding 0  
Net available 1,298  
Total non-committed credit facilities | Bell Canada    
Disclosure of detailed information about borrowings [line items]    
Total available 1,810  
Drawn 0  
Letters of credit 512  
Commercial paper outstanding 0  
Net available 1,298  
Total non-committed credit facilities | Bell Mobility Inc.    
Disclosure of detailed information about borrowings [line items]    
Total available 863  
Drawn 863  
Letters of credit 0  
Commercial paper outstanding 0  
Net available 0  
Total committed and non-committed credit facilities    
Disclosure of detailed information about borrowings [line items]    
Total available 12,744  
Drawn 915  
Letters of credit 583  
Commercial paper outstanding 2,190  
Net available 9,056  
Unsecured revolving credit facility    
Disclosure of detailed information about borrowings [line items]    
Total available 2,700  
Unsecured expansion facility    
Disclosure of detailed information about borrowings [line items]    
Total available $ 1,300