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Non-Controlling Interests - Earnings of Subsidiaries with Non-Controlling Interests (Details) - CAD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2023 | Oct. 04, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of subsidiaries [line items] |  |  |  |  |
Revenue |  |  | $ 2,845 | $ 3,355 | $ 2,976
Net earnings |  |  | 239 | 796 | 161
Total comprehensive income (loss) |  |  | 444 | 893 | (263)
Amounts attributable to the non-controlling interests: |  |  |  |  |
Net earnings (loss) |  |  | 10 | 101 | 111
Total comprehensive income (loss) |  |  | 10 | 76 | 55
Dividend declared |  |  |  |  | 25
TransAlta Cogeneration, L.P. |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |
Revenue |  |  | 167 | 290 | 347
Net earnings |  |  | 9 | 121 | 143
Total comprehensive income (loss) |  |  | 9 | 121 | 143
Amounts attributable to the non-controlling interests: |  |  |  |  |
Net earnings (loss) |  |  | 9 | 80 | 91
Total comprehensive income (loss) |  |  | 9 | 80 | 91
Dividends paid to non-controlling interests |  |  | 40 | $ 148 | 87
Kent Hills Wind L.P. |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |
Revenue | $ 7 |  | 34 |  |
Net earnings | 2 |  | 7 |  |
Total comprehensive income (loss) | 2 |  | 7 |  |
Amounts attributable to the non-controlling interests: |  |  |  |  |
Net earnings (loss) | 0 |  | 1 |  |
Total comprehensive income (loss) | $ 0 |  | $ 1 |  |
TransAlta Renewables, Inc. Including Kent Hills Wind LP |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |
Revenue |  | $ 303 |  |  | 560
Net earnings |  | 56 |  |  | 74
Total comprehensive income (loss) |  | (7) |  |  | (67)
Amounts attributable to the non-controlling interests: |  |  |  |  |
Net earnings (loss) |  | 21 |  |  | 20
Total comprehensive income (loss) |  | (4) |  |  | (36)
Dividends paid to non-controlling interests |  | $ 75 |  |  | $ 100

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