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Trade and other receivables (Details) - CAD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Disclosure Of Trade And Other Receivables [Line Items]    
Current receivables from taxes other than income tax $ 121 $ 92
Other accounts receivable 188 234
Total trade and other receivables 3,949 3,528
Wireless Equipment Installment Plan    
Disclosure Of Trade And Other Receivables [Line Items]    
Current trade receivables 1,040 649
Non-current trade receivables 387 399
Total wireless equipment installment plan receivables 1,427 1,048
Current Assets | Wireless Equipment Installment Plan    
Disclosure Of Trade And Other Receivables [Line Items]    
Allowance for doubtful accounts 44 28
Non-Current Assets | Wireless Equipment Installment Plan    
Disclosure Of Trade And Other Receivables [Line Items]    
Allowance for doubtful accounts 15 17
Gross carrying amount    
Disclosure Of Trade And Other Receivables [Line Items]    
Current trade receivables 3,843 3,414
Allowance for revenue adjustments    
Disclosure Of Trade And Other Receivables [Line Items]    
Current trade receivables (169) (185)
Allowance for doubtful accounts    
Disclosure Of Trade And Other Receivables [Line Items]    
Current trade receivables (136) (149)
Commodity taxes receivable    
Disclosure Of Trade And Other Receivables [Line Items]    
Current trade receivables $ 102 $ 122