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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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