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Intangible Assets - Schedule of Intangible Assets (Details) - CAD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Finite-Lived and Indefinite Lived Intangible Assets [Line Items] |  |
Cost | $ 2,459 | $ 2,301
Accumulated Amortization | (798) | (791)
Net Book Value | 1,661 | 1,510
Land, transmission and water rights |  |
Finite-Lived and Indefinite Lived Intangible Assets [Line Items] |  |
Cost | 1,188 | 1,071
Accumulated Amortization | (210) | (182)
Net Book Value | 978 | 889
Assets under construction |  |
Finite-Lived and Indefinite Lived Intangible Assets [Line Items] |  |
Cost | 93 | 58
Accumulated Amortization | 0 | 0
Net Book Value | 93 | 58
Computer software |  |
Finite-Lived and Indefinite Lived Intangible Assets [Line Items] |  |
Cost | 1,035 | 1,040
Accumulated Amortization | (493) | (528)
Net Book Value | 542 | 512
Other |  |
Finite-Lived and Indefinite Lived Intangible Assets [Line Items] |  |
Cost | 143 | 132
Accumulated Amortization | (95) | (81)
Net Book Value | $ 48 | $ 51

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