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Long-term debt - Summary of Long-Term Debt (Details)
$ in Millions, $ in Millions
Dec. 31, 2024
CAD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
CAD ($)
Dec. 31, 2023
USD ($)
Disclosure of detailed information about borrowings [line items]        
Total long-term debt $ 32,835   $ 31,135  
Forward Starting Interest Rate Swap        
Disclosure of detailed information about borrowings [line items]        
Notional amount $ 1,080 $ 800    
1997 trust indenture | Weighted Average        
Disclosure of detailed information about borrowings [line items]        
Weighted average interest rate at December 31, 2024 4.18% 4.18%    
1976 trust indenture | Weighted Average        
Disclosure of detailed information about borrowings [line items]        
Weighted average interest rate at December 31, 2024 9.38% 9.38%    
2011 trust indenture | Weighted Average        
Disclosure of detailed information about borrowings [line items]        
Weighted average interest rate at December 31, 2024    
2016 U.S. trust indenture        
Disclosure of detailed information about borrowings [line items]        
Notional amount $ 6,550     $ 5,700
2016 U.S. trust indenture | Weighted Average        
Disclosure of detailed information about borrowings [line items]        
Weighted average interest rate at December 31, 2024 4.24% 4.24%    
1996 trust indenture (subordinated) | Weighted Average        
Disclosure of detailed information about borrowings [line items]        
Weighted average interest rate at December 31, 2024 8.21% 8.21%    
Lease liabilities | Weighted Average        
Disclosure of detailed information about borrowings [line items]        
Weighted average interest rate at December 31, 2024 4.35% 4.35%    
Bell Mobility trade loan | Weighted Average        
Disclosure of detailed information about borrowings [line items]        
Weighted average interest rate at December 31, 2024 4.87% 4.87%    
Supplier finance arrangements | Weighted Average        
Disclosure of detailed information about borrowings [line items]        
Weighted average interest rate at December 31, 2024 6.42% 6.42%    
Trade receivables        
Disclosure of detailed information about borrowings [line items]        
Total debt $ 36,862   34,527  
Trade receivables | 1997 trust indenture        
Disclosure of detailed information about borrowings [line items]        
Total debt 20,273   19,768  
Trade receivables | 1976 trust indenture        
Disclosure of detailed information about borrowings [line items]        
Total debt 975   975  
Trade receivables | 2011 trust indenture        
Disclosure of detailed information about borrowings [line items]        
Total debt 0   225  
Trade receivables | 2016 U.S. trust indenture        
Disclosure of detailed information about borrowings [line items]        
Total debt 9,445   7,529  
Notional amount       600
Trade receivables | 1996 trust indenture (subordinated)        
Disclosure of detailed information about borrowings [line items]        
Total debt 275   275  
Trade receivables | Lease liabilities        
Disclosure of detailed information about borrowings [line items]        
Total debt 4,591   4,857  
Trade receivables | Bell Mobility trade loan        
Disclosure of detailed information about borrowings [line items]        
Total debt 863 $ 600 476 $ 360
Trade receivables | Supplier finance arrangements        
Disclosure of detailed information about borrowings [line items]        
Total debt 197   218  
Trade receivables | Other        
Disclosure of detailed information about borrowings [line items]        
Total debt 243   204  
Trade receivables | Series M-53 MTN debentures | Interest rate swap contract        
Disclosure of detailed information about borrowings [line items]        
Notional amount 1,300   1,625  
Trade receivables | Series M-53 MTN debentures | Forward Starting Interest Rate Swap | 2028        
Disclosure of detailed information about borrowings [line items]        
Notional amount 525      
Net unamortized discount        
Disclosure of detailed information about borrowings [line items]        
Total debt 29   33  
Unamortized debt issuance costs        
Disclosure of detailed information about borrowings [line items]        
Total debt 132   112  
Supplier finance arrangements due within one year        
Disclosure of detailed information about borrowings [line items]        
Total debt 73   74  
Long-term debt        
Disclosure of detailed information about borrowings [line items]        
Total debt $ 3,793   $ 3,173