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Goodwill (Details) | 12 Months Ended
--- | ---
Dec. 31, 2023 CAD ($) $ / MWh | Dec. 31, 2022 CAD ($) $ / MWh
Disclosure of detailed information about intangible assets [line items] |  |
Goodwill | $ 464,000,000 | $ 464,000,000
Impairment of goodwill | 0 |
Hydro |  |
Disclosure of detailed information about intangible assets [line items] |  |
Goodwill | 258,000,000 | 258,000,000
Wind and Solar |  |
Disclosure of detailed information about intangible assets [line items] |  |
Goodwill | 176,000,000 | 176,000,000
Energy Marketing |  |
Disclosure of detailed information about intangible assets [line items] |  |
Goodwill | $ 30,000,000 | $ 30,000,000
Minimum |  |
Disclosure of detailed information about intangible assets [line items] |  |
Discount rate used to calculate goodwill impairment | 5.90% | 5.90%
Electricity prices | $ / MWh | 20 | 28
Maximum |  |
Disclosure of detailed information about intangible assets [line items] |  |
Discount rate used to calculate goodwill impairment | 8.20% | 8.20%
Electricity prices | $ / MWh | 238 | 233

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