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financing costs (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Interest expense    
Long-term debt, excluding lease liabilities and other - gross $ 1,168 $ 1,095
Long-term debt, excluding lease liabilities and other - capitalized (21) (6)
Long-term debt, excluding lease liabilities and other - net 1,147 1,089
Short-term borrowings and other 41 25
Interest expense From transactions that only involve the raising of finance Total 1,188 1,114
Long-term debt - lease liabilities 166 133
Long-term debt - other 22 9
Employee defined benefit plans net interest 9 7
Accretion on provisions 29 30
Interest expense From transactions that do not only involve the raising of finance Total 226 179
Interest expense other than foreign exchange and unrealized changes 1,414 1,293
Foreign exchange (36) 3
Unrealized changes in virtual power purchase agreements forward element 231  
Total 1,609 1,296
Interest income (33) (23)
Net 1,576 1,273
Net interest cost 1,357 1,272
Interest expense on long-term debt, excluding lease liabilities and other - capitalized (21) (6)
Employee defined benefit plans net interest 9 $ 7
Unrealized changes in virtual power purchase agreements forward element $ 231  
Composite interest rate on long-term debt, excluding lease liabilities (as a percent) 5.30% 3.10%