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Non-Controlling Interests - Financial Position of Non-Controlling Interests (Details) - CAD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of subsidiaries [line items] |  |  |
Current assets | $ 1,773 | $ 1,580 |
Current liabilities | (2,569) | (1,742) |
Total equity | 1,843 | 1,664 | $ 1,989
Equity attributable to non-controlling interests | 97 | 127 |
TransAlta Cogeneration, L.P. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current assets | 47 | 43 |
Long-term assets | 130 | 193 |
Current liabilities | (48) | (41) |
Long-term liabilities | (32) | (34) |
Total equity | (97) | (161) |
Equity attributable to non-controlling interests | $ (46) | $ (79) |
Non-controlling interest share (per cent) | 49.99% | 49.99% |
Kent Hills Wind L.P. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current assets | $ 33 | $ 35 |
Long-term assets | 463 | 481 |
Current liabilities | (26) | (42) |
Long-term liabilities | (174) | (188) |
Total equity | (296) | (285) |
Equity attributable to non-controlling interests | $ (51) | $ (48) |
Non-controlling interest share (per cent) | 17.00% | 17.00% |

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