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Interest and Other Financing Expense (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Borrowing costs [abstract]      
Long-term debt $ 627 $ 610 $ 681
Lease liabilities 64 60 62
Total interest and other financing expense 691 670 743
Total interest income and other (55) (121) (32)
Net interest and other financing expense $ 636 $ 549 $ 711