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Non-Controlling Interests - Subsidiaries and Operations with Non-Controlling Interests (Details) shares in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 MW shares | Dec. 31, 2020 | Dec. 31, 2019
TransAlta Cogeneration, L.P. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interests held by non-controlling interests | 49.99% | 49.99% |
TransAlta Renewables Inc. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interests held by non-controlling interests | 39.90% | 39.90% |
Proportion of ownership interest in subsidiary | 60.10% |  | 60.40%
Number of shares issued | shares | 1 |  |
Kent Hills wind farm | TransAlta Renewables Inc. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interests held by non-controlling interests | 17.00% |  |
Capacity of facility (in megawatts) | MW | 167 |  |

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