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Interest Expense, Net (Components of Interest Expense, Net) (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Interest Expense, Net [Abstract] |  |
Interest on debt | $ 1,004 | $ 954
Allowance for borrowed funds used during construction | (23) | (16)
Other | (8) | (13)
Interest expense, net | $ 973 | $ 925

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