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Segmented information - Revenues by Services and Products (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Operating revenues $ 22,883 $ 23,793
Total services    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Operating revenues 19,832 20,566
Wireless    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Operating revenues 6,122 6,323
Data    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Operating revenues 7,691 7,617
Voice    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Operating revenues 3,402 3,564
Media    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Operating revenues 2,369 2,811
Other services    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Operating revenues 248 251
Total products    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Operating revenues 3,051 3,227
Wireless    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Operating revenues 2,508 2,623
Data    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Operating revenues 494 556
Equipment and other    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Operating revenues $ 49 $ 48