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Trade and other receivables - Schedule of Wireless Device Financing Plan Receivables (Details) - CAD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Allowance for doubtful accounts    
Disclosure Of Trade And Other Receivables [Line Items]    
Current $ (120) $ (118)
Wireless Equipment Installment Plan    
Disclosure Of Trade And Other Receivables [Line Items]    
Current 1,063 1,052
Non-current 410 401
Total wireless equipment installment plan receivables 1,473 1,453
Current Assets | Wireless Equipment Installment Plan | Allowance for doubtful accounts    
Disclosure Of Trade And Other Receivables [Line Items]    
Financial assets 45 45
Non-Current Assets | Wireless Equipment Installment Plan | Allowance for doubtful accounts    
Disclosure Of Trade And Other Receivables [Line Items]    
Financial assets $ 12 $ 15