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Long-term debt - Summary of Long-Term Debt (Details)
$ in Millions, $ in Millions
Dec. 31, 2023
CAD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
CAD ($)
Dec. 31, 2022
USD ($)
Disclosure of detailed information about borrowings [line items]        
Total long-term debt due within one year $ (3,247)   $ (1,680)  
Total long-term debt $ 31,135   27,783  
1997 trust indenture | Weighted Average        
Disclosure of detailed information about borrowings [line items]        
WEIGHTED AVERAGE INTEREST RATE AT DECEMBER 31, 2023 4.02% 4.02%    
1976 trust indenture | Weighted Average        
Disclosure of detailed information about borrowings [line items]        
WEIGHTED AVERAGE INTEREST RATE AT DECEMBER 31, 2023 9.38% 9.38%    
2011 trust indenture | Weighted Average        
Disclosure of detailed information about borrowings [line items]        
WEIGHTED AVERAGE INTEREST RATE AT DECEMBER 31, 2023 4.00% 4.00%    
2016 U.S. trust indenture        
Disclosure of detailed information about borrowings [line items]        
Notional amount $ 5,700     $ 4,850
2016 U.S. trust indenture | Weighted Average        
Disclosure of detailed information about borrowings [line items]        
WEIGHTED AVERAGE INTEREST RATE AT DECEMBER 31, 2023 3.58% 3.58%    
1996 trust indenture (subordinated) | Weighted Average        
Disclosure of detailed information about borrowings [line items]        
WEIGHTED AVERAGE INTEREST RATE AT DECEMBER 31, 2023 8.21% 8.21%    
Lease liabilities | Weighted Average        
Disclosure of detailed information about borrowings [line items]        
WEIGHTED AVERAGE INTEREST RATE AT DECEMBER 31, 2023 5.82% 5.82%    
Bell Mobility trade loan | Weighted Average        
Disclosure of detailed information about borrowings [line items]        
WEIGHTED AVERAGE INTEREST RATE AT DECEMBER 31, 2023 6.98% 6.98%    
Trade receivables        
Disclosure of detailed information about borrowings [line items]        
Total debt $ 34,527   29,598  
Trade receivables | 1997 trust indenture        
Disclosure of detailed information about borrowings [line items]        
Total debt 19,768   16,747  
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 225   225  
Trade receivables | 2016 U.S. trust indenture        
Disclosure of detailed information about borrowings [line items]        
Total debt 7,529   6,525  
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 4,857   4,402  
Trade receivables | Bell Mobility trade loan        
Disclosure of detailed information about borrowings [line items]        
Total debt 476 $ 360 0  
Trade receivables | Other        
Disclosure of detailed information about borrowings [line items]        
Total debt 422   449  
Trade receivables | Series M-53 MTN debentures | Interest rate swap contract        
Disclosure of detailed information about borrowings [line items]        
Notional amount 1,625   500  
Trade receivables | Series M-53 MTN debentures | Forward Starting Interest Rate Swap | 2024        
Disclosure of detailed information about borrowings [line items]        
Notional amount 700      
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 33   34  
Unamortized debt issuance costs        
Disclosure of detailed information about borrowings [line items]        
Total debt $ 112   $ 101