v3.26.1
financial instruments - Activity related to allowance for doubtful accounts (Details) - CAD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Summary of activity related to allowance for doubtful accounts        
Accounts written off during the period that were still subject to enforcement activity $ 60 $ 66 $ 118 $ 131
Customer accounts receivable        
Summary of activity related to allowance for doubtful accounts        
Balance, beginning of period     (3,265)  
Balance, end of period (3,095)   (3,095)  
Customer accounts receivable | Allowance for doubtful accounts        
Summary of activity related to allowance for doubtful accounts        
Balance, beginning of period 145 139 143 134
Additions (doubtful accounts expense) 35 38 63 87
Accounts written off less than recoveries (43) (37) (72) (85)
Other 2 (1) 5 3
Balance, end of period $ 139 $ 139 $ 139 $ 139