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Trade and other receivables (Details) - CAD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Disclosure Of Trade And Other Receivables [Line Items]    
Current tax receivable $ 48 $ 121
Other accounts receivable 266 188
Total trade and other receivables 4,138 3,949
Wireless Equipment Installment Plan    
Disclosure Of Trade And Other Receivables [Line Items]    
Current trade receivables 1,021 1,040
Non-current 386 387
Total wireless equipment installment plan receivables 1,407 1,427
Current Assets | Wireless Equipment Installment Plan    
Disclosure Of Trade And Other Receivables [Line Items]    
Allowance for doubtful accounts 46 44
Non-Current Assets | Wireless Equipment Installment Plan    
Disclosure Of Trade And Other Receivables [Line Items]    
Allowance for doubtful accounts 15 15
Trade receivables    
Disclosure Of Trade And Other Receivables [Line Items]    
Current trade receivables 4,102 3,843
Allowance for revenue adjustments    
Disclosure Of Trade And Other Receivables [Line Items]    
Current trade receivables (160) (169)
Allowance for doubtful accounts    
Disclosure Of Trade And Other Receivables [Line Items]    
Current trade receivables (129) (136)
Commodity taxes receivable    
Disclosure Of Trade And Other Receivables [Line Items]    
Current trade receivables $ 11 $ 102