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Segmented information - Revenues by Services and Products (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Operating revenues $ 24,673 $ 24,174
External Service Revenue    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Operating revenues 24,673 24,174
Wireless    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Operating revenues 7,120 6,821
Wireline data    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Operating revenues 8,084 7,920
Wireline voice    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Operating revenues 2,862 3,002
Media    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Operating revenues 2,776 2,904
Other wireline services    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Operating revenues 312 309
Total services    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Operating revenues 21,154 20,956
Total services | External Service Revenue    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Operating revenues 21,154 20,956
Wireless    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Operating revenues 2,885 2,714
Wireline    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Operating revenues 634 504
Total products    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Operating revenues $ 3,519 $ 3,218