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Segments Disclosures - Additions to non-current assets (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of operating segments [line items] |  |  |
PP&E | $ 311 | $ 875 | $ 918
Intangible assets | 10 | 13 | 31
Operating segments | Hydro |  |  |
Disclosure of operating segments [line items] |  |  |
PP&E | 64 | 42 | 36
Intangible assets | 0 | 0 | 0
Operating segments | Wind and Solar |  |  |
Disclosure of operating segments [line items] |  |  |
PP&E | 97 | 674 | 745
Intangible assets | 0 | 0 | 19
Operating segments | Gas |  |  |
Disclosure of operating segments [line items] |  |  |
PP&E | 100 | 89 | 43
Intangible assets | 0 | 0 | 0
Operating segments | Energy Transition |  |  |
Disclosure of operating segments [line items] |  |  |
PP&E | 13 | 16 | 19
Intangible assets | 0 | 0 | 0
Operating segments | Energy Marketing |  |  |
Disclosure of operating segments [line items] |  |  |
PP&E | 0 | 0 | 0
Intangible assets | 0 | 0 | 3
Operating segments | Corporate |  |  |
Disclosure of operating segments [line items] |  |  |
PP&E | 37 | 54 | 75
Intangible assets | $ 10 | $ 13 | $ 9

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