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Income Taxes (Composition of Income Before Provision for Income Taxes) (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Composition of taxes on income from continuing operations [Line items]
Income before provision for income taxes	$ 409	$ 1,173
Canada
Composition of taxes on income from continuing operations [Line items]
Income before provision for income taxes	156	171
United States
Composition of taxes on income from continuing operations [Line items]
Income before provision for income taxes	203	964
Other
Composition of taxes on income from continuing operations [Line items]
Income before provision for income taxes	$ 50	$ 38

X

- Definition

Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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