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Interest Expense, Net (Components of Interest Expense, Net) (Details) - CAD ($) $ in Millions	12 Months Ended
	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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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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Amount of interest expense classified as other.

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Amount of interest income (expense) classified as operating.

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Amount capitalized of allowance for funds used during construction.

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