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Trade and other receivables - Schedule of Trade and Other Receivables (Details) - CAD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure Of Trade And Other Receivables [Line Items]    
Current tax receivable $ 12 $ 48
Other accounts receivable 311 266
Total trade and other receivables 4,031 4,138
Trade receivables    
Disclosure Of Trade And Other Receivables [Line Items]    
Current 3,959 4,102
Allowance for revenue adjustments    
Disclosure Of Trade And Other Receivables [Line Items]    
Current (145) (160)
Allowance for doubtful accounts    
Disclosure Of Trade And Other Receivables [Line Items]    
Current (118) (129)
Commodity taxes receivable    
Disclosure Of Trade And Other Receivables [Line Items]    
Current $ 12 $ 11