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Trade and other receivables - Schedule of Wireless Device Financing Plan Receivables (Details) - CAD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Current Assets | Wireless Equipment Installment Plan    
Disclosure Of Trade And Other Receivables [Line Items]    
Allowance for doubtful accounts $ 45 $ 46
Non-Current Assets | Wireless Equipment Installment Plan    
Disclosure Of Trade And Other Receivables [Line Items]    
Allowance for doubtful accounts 15 15
Wireless Equipment Installment Plan    
Disclosure Of Trade And Other Receivables [Line Items]    
Current 1,052 1,021
Non-current 401 386
Total wireless equipment installment plan receivables $ 1,453 $ 1,407