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Non-Controlling Interests - Subsidiaries and Operations with Non-Controlling Interests (Details) - CAD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 04, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of subsidiaries [line items] |  |  |  |
Total comprehensive income (loss) |  | $ 893 | $ (263) | $ (610)
TransAlta Cogeneration, L.P. |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Ownership interests |  | 49.99% | 49.99% |
Total comprehensive income (loss) |  | $ 121 | $ 143 | 103
Dividends paid to non-controlling interests |  | $ 148 | $ 87 | $ 56
Kent Hills wind farm |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Ownership interests | 17.00% | 17.00% | 17.00% |
Kent Hills wind farm | TransAlta Renewables Inc. |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Ownership interests | 17.00% |  |  |
TransAlta Renewables Inc. |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Ownership interests | 39.90% |  | 39.90% |
Coal facility | TransAlta Cogeneration, L.P. |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Ownership interests |  | 50.00% |  |

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