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Asset Impairment Charges (Reversals) - Narrative (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 CAD ($) | Dec. 31, 2023 CAD ($) asset facility | Dec. 31, 2022 CAD ($) facility asset
Disclosure of impairment loss recognised or reversed [line items] |  |  |
Asset impairment charges (reversals) | $ 46 | $ (48) | $ 9
Assets | 9,499 | 8,659 |
Reversal of impairment loss | 17 | $ 21 |
Wind Facilities |  |  |
Disclosure of impairment loss recognised or reversed [line items] |  |  |
Number of assets | asset |  | 2 |
Impairment charges |  | $ 13 |
Hydro |  |  |
Disclosure of impairment loss recognised or reversed [line items] |  |  |
Number of facilities | facility |  | 2 | 4
Asset impairment charges (reversals) | 0 | $ (10) | $ 21
Hydro | Hydro Facilities |  |  |
Disclosure of impairment loss recognised or reversed [line items] |  |  |
Number of assets | asset |  |  | 4
Hydro | Level III | Non-recurring fair value measurement | Hydro Facilities |  |  |
Disclosure of impairment loss recognised or reversed [line items] |  |  |
Assets |  | 70 | $ 89
Wind and Solar |  |  |
Disclosure of impairment loss recognised or reversed [line items] |  |  |
Asset impairment charges (reversals) | $ 0 | $ (4) | $ 43
Wind and Solar | Wind and Solar Facilities |  |  |
Disclosure of impairment loss recognised or reversed [line items] |  |  |
Number of assets | asset |  |  | 6
Wind and Solar | Wind Facilities |  |  |
Disclosure of impairment loss recognised or reversed [line items] |  |  |
Number of facilities | facility |  | 3 |
Wind and Solar | Level III | Non-recurring fair value measurement | Wind and Solar Facilities |  |  |
Disclosure of impairment loss recognised or reversed [line items] |  |  |
Assets |  | $ 540 | $ 754
Reversal of impairment loss |  | 17 |
Wind and Solar | Level III | Non-recurring fair value measurement | Wind Facilities |  |  |
Disclosure of impairment loss recognised or reversed [line items] |  |  |
Assets |  | $ 130 |
Wind |  |  |
Disclosure of impairment loss recognised or reversed [line items] |  |  |
Number of facilities | facility |  |  | 5
Solar |  |  |
Disclosure of impairment loss recognised or reversed [line items] |  |  |
Number of facilities | facility |  |  | 1

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