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Segments Disclosures - Selected Consolidated Statements of Financial Position Information (Details) - CAD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Disclosure of operating segments [line items] |  |  |
PP&E | $ 5,714 | $ 5,556 | $ 5,320
Right-of-use assets | 117 | 126 | 95
Intangible assets | 223 | 252 | $ 256
Goodwill | 464 | 464 |
Wind and Solar |  |  |
Disclosure of operating segments [line items] |  |  |
Goodwill | 176 | 176 |
Energy Marketing |  |  |
Disclosure of operating segments [line items] |  |  |
Goodwill | 30 | 30 |
Corporate |  |  |
Disclosure of operating segments [line items] |  |  |
PP&E | 98 | 111 |
Right-of-use assets | 11 | 14 |
Intangible assets | 31 | 31 |
Goodwill | 0 | 0 |
Operating segments | Hydro |  |  |
Disclosure of operating segments [line items] |  |  |
PP&E | 462 | 437 |
Right-of-use assets | 7 | 6 |
Intangible assets | 2 | 2 |
Goodwill | 258 | 258 |
Operating segments | Wind and Solar |  |  |
Disclosure of operating segments [line items] |  |  |
PP&E | 3,360 | 2,837 |
Right-of-use assets | 94 | 98 |
Intangible assets | 141 | 157 |
Goodwill | 176 | 176 |
Operating segments | Gas |  |  |
Disclosure of operating segments [line items] |  |  |
PP&E | 1,543 | 1,858 |
Right-of-use assets | 5 | 6 |
Intangible assets | 40 | 49 |
Goodwill | 0 | 0 |
Operating segments | Energy Transition |  |  |
Disclosure of operating segments [line items] |  |  |
PP&E | 251 | 313 |
Right-of-use assets | 0 | 2 |
Intangible assets | 4 | 5 |
Goodwill | 0 | 0 |
Operating segments | Energy Marketing |  |  |
Disclosure of operating segments [line items] |  |  |
PP&E | 0 | 0 |
Right-of-use assets | 0 | 0 |
Intangible assets | 5 | 8 |
Goodwill | $ 30 | $ 30 |

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