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Segmented information - Revenues by Services and Products (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Operating revenues $ 24,409 $ 24,673
External service revenues    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Operating revenues 24,409 24,673
Wireless voice and data    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Operating revenues 7,136 7,120
Wireline data    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Operating revenues 8,117 8,084
Wireline voice    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Operating revenues 2,672 2,862
Media    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Operating revenues 2,830 2,776
Other wireline services    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Operating revenues 318 312
Total services    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Operating revenues 21,073 21,154
Total services | External service revenues    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Operating revenues 21,073 21,154
Wireless    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Operating revenues 2,715 2,885
Wireline    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Operating revenues 621 634
Total products    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Operating revenues $ 3,336 $ 3,519