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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of subsidiaries [line items] |  |  |  |  |
Revenue |  |  | $ 3,355 | $ 2,976 | $ 2,721
Net earnings (loss) |  |  | 796 | 161 | (425)
Total comprehensive income (loss) |  |  | 893 | (263) | (610)
Amounts attributable to the non-controlling interests: |  |  |  |  |
Net earnings (loss) |  |  | 101 | 111 | 112
Total comprehensive income (loss) |  |  | 76 | 55 | 83
TransAlta Cogeneration, L.P. |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |
Revenue |  |  | 290 | 347 | 265
Net earnings (loss) |  |  | 121 | 143 | 103
Total comprehensive income (loss) |  |  | 121 | 143 | 103
Amounts attributable to the non-controlling interests: |  |  |  |  |
Net earnings (loss) |  |  | 80 | 91 | 62
Total comprehensive income (loss) |  |  | 80 | 91 | 62
Dividends paid to non-controlling interests |  |  | $ 148 | 87 | 56
Kent Hills Wind L.P. |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |
Revenue | $ 7 |  |  |  |
Net earnings (loss) | 2 |  |  |  |
Total comprehensive income (loss) | 2 |  |  |  |
Amounts attributable to the non-controlling interests: |  |  |  |  |
Net earnings (loss) | 0 |  |  |  |
Total comprehensive income (loss) | $ 0 |  |  |  |
TransAlta Renewables, Inc. Including Kent Hills Wind LP |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |
Revenue |  | $ 303 |  | 560 | 470
Net earnings (loss) |  | 56 |  | 74 | 139
Total comprehensive income (loss) |  | (7) |  | (67) | 66
Amounts attributable to the non-controlling interests: |  |  |  |  |
Net earnings (loss) |  | 21 |  | 20 | 50
Total comprehensive income (loss) |  | (4) |  | (36) | 21
Dividends paid to non-controlling interests |  | $ 75 |  | $ 100 | $ 100

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