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Goodwill (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 CAD ($) cADPerMegawattHour | Dec. 31, 2020 CAD ($) cADPerMegawattHour
Disclosure of detailed information about intangible assets [line items] |  |
Goodwill | $ 463 | $ 463
Hydro generation |  |
Disclosure of detailed information about intangible assets [line items] |  |
Goodwill | 258 | 258
Wind and Solar |  |
Disclosure of detailed information about intangible assets [line items] |  |
Goodwill | 175 | 175
Energy Marketing |  |
Disclosure of detailed information about intangible assets [line items] |  |
Goodwill | $ 30 | $ 30
Minimum |  |
Disclosure of detailed information about intangible assets [line items] |  |
Electricity prices | cADPerMegawattHour | 17 | 6
Discount rate used to calculate goodwill impairment | 5.00% | 4.80%
Maximum |  |
Disclosure of detailed information about intangible assets [line items] |  |
Electricity prices | cADPerMegawattHour | 136 | 160
Discount rate used to calculate goodwill impairment | 6.40% | 6.30%

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