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Segmented information - Revenues by Services and Products (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Operating revenues $ 24,174 $ 23,449
BELL WIRELESS    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Operating revenues 9,535 8,948
Wireless    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Operating revenues 20,956 20,350
Wireless | BELL WIRELESS    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Operating revenues 6,821 6,355
Wireline data    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Operating revenues 7,920 7,871
Wireline voice    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Operating revenues 3,002 3,154
Media    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Operating revenues 2,904 2,681
Other wireline services    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Operating revenues 309 289
Total products    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Operating revenues 3,218 3,099
Wireless | BELL WIRELESS    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Operating revenues 2,714 2,593
Wireline data    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Operating revenues 459 463
Wireline equipment and other    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Operating revenues $ 45 $ 43