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income taxes - Other (Details) - Investment Tax Credits - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Other |  |
Tax benefits recognized | $ 51 | $ 25
Property, plant, and equipment and/or intangible assets |  |
Other |  |
Tax benefits recognized | $ 48 | $ 19

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