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Goodwill (Details) | 12 Months Ended
--- | ---
Dec. 31, 2024 CAD ($) $ / MWh | Dec. 31, 2023 CAD ($) $ / MWh
Disclosure of detailed information about intangible assets [line items] |  |
Total goodwill | $ 517,000,000 | $ 464,000,000
Impairment of goodwill | $ 0 |
Wind and Solar | Merchant Discount Rate |  |
Disclosure of detailed information about intangible assets [line items] |  |
Discount rate | 0.50% |
Minimum |  |
Disclosure of detailed information about intangible assets [line items] |  |
Electricity prices (in CAD per Mwh) | $ / MWh | 40 | 35
Discount rate | 6.40% | 6.40%
Maximum |  |
Disclosure of detailed information about intangible assets [line items] |  |
Electricity prices (in CAD per Mwh) | $ / MWh | 225 | 238
Discount rate | 7.30% | 7.50%
Hydro generation |  |
Disclosure of detailed information about intangible assets [line items] |  |
Total goodwill | $ 258,000,000 | $ 258,000,000
Wind and Solar |  |
Disclosure of detailed information about intangible assets [line items] |  |
Total goodwill | 178,000,000 | 176,000,000
Gas |  |
Disclosure of detailed information about intangible assets [line items] |  |
Total goodwill | 51,000,000 | 0
Energy Marketing |  |
Disclosure of detailed information about intangible assets [line items] |  |
Total goodwill | $ 30,000,000 | $ 30,000,000

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