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financial instruments - Activity related to allowance for doubtful accounts (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Summary of activity related to allowance for doubtful accounts    
Accounts written off during the period that were still subject to enforcement activity $ 254 $ 180
Customer accounts receivable    
Summary of activity related to allowance for doubtful accounts    
Balance, beginning of period (3,472)  
Balance, end of period (3,355) (3,472)
Customer accounts receivable | Allowance for doubtful accounts    
Summary of activity related to allowance for doubtful accounts    
Balance, beginning of period 117 109
Additions (doubtful accounts expense) 173 110
Accounts written off less than recoveries (160) (109)
Other 4 7
Balance, end of period $ 134 $ 117