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Interest and Other Financing Expense (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Borrowing costs [abstract]      
Interest expense on long-term debt $ 604 $ 627 $ 610
Interest expense on lease liabilities 69 64 60
Interest expense on long-term debt and lease liabilities 673 691 670
Interest (income) and other expense (81) (55) (121)
Interest and other financing expense $ 592 $ 636 $ 549