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Trade and other receivables (Details) - CAD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Trade And Other Receivables [Line Items]    
Current tax receivable $ 92 $ 23
Other accounts receivable 234 188
Total trade and other receivables 3,528 3,038
Wireless Equipment Installment Plan    
Disclosure Of Trade And Other Receivables [Line Items]    
Current trade receivables 649 85
Non-current trade receivables 399 65
Total wireless equipment installment plan receivables 1,048 150
Current Assets | Wireless Equipment Installment Plan    
Disclosure Of Trade And Other Receivables [Line Items]    
Allowance for doubtful accounts 28 9
Non-Current Assets | Wireless Equipment Installment Plan    
Disclosure Of Trade And Other Receivables [Line Items]    
Allowance for doubtful accounts 17 5
Gross carrying amount    
Disclosure Of Trade And Other Receivables [Line Items]    
Current trade receivables 3,414 2,981
Allowance for revenue adjustments    
Disclosure Of Trade And Other Receivables [Line Items]    
Current trade receivables (185) (104)
Allowance for doubtful accounts    
Disclosure Of Trade And Other Receivables [Line Items]    
Current trade receivables (149) (62)
Commodity taxes receivable    
Disclosure Of Trade And Other Receivables [Line Items]    
Current trade receivables $ 122 $ 12