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Asset Impairment Charges (Reversals) - Narrative (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2022 CAD ($) | Mar. 31, 2021 CAD ($) | Dec. 31, 2023 CAD ($) facility asset MW | Dec. 31, 2022 CAD ($) facility asset | Dec. 31, 2021 CAD ($) MW
Disclosure of impairment loss recognised or reversed [line items] |  |  |  |  |
Asset impairment charges (reversals) |  |  | $ (48) | $ 9 | $ 648
Recoverable amounts | $ 10,741 |  | 8,659 | 10,741 |
Estimated salvage value |  |  |  |  | 33
Reversal of impairment loss |  |  | $ 21 | $ 102 |
Energy Transition |  |  |  |  |
Disclosure of impairment loss recognised or reversed [line items] |  |  |  |  |
Asset impairment charges (reversals) |  |  |  |  | 191
Discount rate, measurement input |  |  |  |  |
Disclosure of impairment loss recognised or reversed [line items] |  |  |  |  |
Discount rates | 5.0 |  |  | 5.0 |
Wind Facilities |  |  |  |  |
Disclosure of impairment loss recognised or reversed [line items] |  |  |  |  |
Impairment charges |  |  |  | $ 13 | 10
Number of assets | asset |  |  | 2 |  |
Wind Facilities | Level III | Non-recurring fair value measurement | Investment property |  |  |  |  |
Disclosure of impairment loss recognised or reversed [line items] |  |  |  |  |
Recoverable amounts |  |  |  |  | 65
Kent Hills Wind L.P. |  |  |  |  |
Disclosure of impairment loss recognised or reversed [line items] |  |  |  |  |
Impairment charges |  |  |  |  | $ 2
Capacity of facility (in megawatts) | MW |  |  | 167 |  | 167
Keephills Unit 1 | Energy Transition |  |  |  |  |
Disclosure of impairment loss recognised or reversed [line items] |  |  |  |  |
Asset impairment charges (reversals) |  |  |  |  | $ 94
Sundance Unit 4 | Energy Transition |  |  |  |  |
Disclosure of impairment loss recognised or reversed [line items] |  |  |  |  |
Asset impairment charges (reversals) |  |  |  |  | 56
Kaybob Cogeneration Project | Corporate |  |  |  |  |
Disclosure of impairment loss recognised or reversed [line items] |  |  |  |  |
Asset impairment charges (reversals) |  |  | $ 0 | (2) | 27
Impairment charges |  | $ 27 |  |  |
Reversal of impairment loss | $ 2 |  |  |  |
Hydro |  |  |  |  |
Disclosure of impairment loss recognised or reversed [line items] |  |  |  |  |
Asset impairment charges (reversals) |  |  | $ (10) | $ 21 | 5
Number of facilities | facility |  |  | 2 | 4 |
Hydro | Hydro Facilities |  |  |  |  |
Disclosure of impairment loss recognised or reversed [line items] |  |  |  |  |
Number of assets | asset |  |  |  | 4 |
Hydro | Hydro Facilities | Level III | Non-recurring fair value measurement |  |  |  |  |
Disclosure of impairment loss recognised or reversed [line items] |  |  |  |  |
Recoverable amounts | 89 |  | $ 70 | $ 89 |
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 |
Wind and Solar |  |  |  |  |
Disclosure of impairment loss recognised or reversed [line items] |  |  |  |  |
Asset impairment charges (reversals) |  |  | $ (4) | $ 43 | 12
Wind and Solar | Wind and Solar Facilities |  |  |  |  |
Disclosure of impairment loss recognised or reversed [line items] |  |  |  |  |
Number of assets | asset |  |  | 3 | 6 |
Wind and Solar | Wind and Solar Facilities | Level III | Non-recurring fair value measurement |  |  |  |  |
Disclosure of impairment loss recognised or reversed [line items] |  |  |  |  |
Recoverable amounts | $ 754 |  | $ 540 | $ 754 |
Reversal of impairment loss |  |  | 17 |  |
Wind and Solar | Wind Facilities | Level III | Non-recurring fair value measurement |  |  |  |  |
Disclosure of impairment loss recognised or reversed [line items] |  |  |  |  |
Recoverable amounts |  |  | $ 130 |  |
Mining assets | Highvale Mine |  |  |  |  |
Disclosure of impairment loss recognised or reversed [line items] |  |  |  |  |
Impairment charges |  |  |  |  | $ 195

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