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Other Assets (Details) - CAD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |  |
Employee future benefits (Note 24) | $ 551 | $ 355
Equity investments | 259 | 237
Other investments | 225 | 180
RECs (Note 8) | 176 | 155
Supplemental Executive Retirement Plan ("SERP") | 127 | 117
Operating leases (Note 15) | 64 | 51
Derivatives | 48 | 43
Deferred compensation plan | 29 | 22
Other | 174 | 138
Other assets | $ 1,653 | $ 1,298

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