INCOME TAXES - Narrative (Details) - CAD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023
Income Taxes
Foreign subsidiaries' undistributed earnings on which deferred income taxes has not been provided	$ 9,500	$ 6,600
Interest and penalties (recovery) expense related to unrecognized tax benefits	(8)	1
Accrued interest and penalties related to unrecognized tax benefits	6	14
Canada
Income Taxes
Benefit of unused tax loss carryforwards recognized	1,300	1,300
US
Income Taxes
Benefit of unused tax loss carryforwards recognized	$ 4,200	$ 6,400

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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Amount of undistributed earnings of foreign subsidiaries intended to be permanently reinvested outside the country of domicile.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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Amount of expense for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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