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Non-Controlling Interests - Financial Position of 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] |  |  |  |
Current assets |  | $ 1,580 | $ 3,714 |
Current liabilities |  | (1,742) | (2,888) |
Total equity |  | 1,664 | 1,989 | $ 2,593
Equity attributable to non-controlling interests |  | 127 | 879 |
TransAlta Cogeneration, L.P. |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Current assets |  | 43 | 127 |
Long-term assets |  | 193 | 253 |
Current liabilities |  | (41) | (62) |
Long-term liabilities |  | (34) | (27) |
Total equity |  | (161) | (291) |
Equity attributable to non-controlling interests |  | $ (79) | $ (147) |
Non-controlling interests’ share (per cent) |  | 49.99% | 49.99% |
Kent Hills Wind L.P. |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Current assets |  | $ 35 |  |
Long-term assets |  | 481 |  |
Current liabilities |  | (42) |  |
Long-term liabilities |  | (188) |  |
Total equity |  | (285) |  |
Equity attributable to non-controlling interests |  | $ (48) |  |
Non-controlling interests’ share (per cent) |  | 17.00% |  |
TransAlta Renewables Inc. |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Current assets |  |  | $ 240 |
Long-term assets |  |  | 2,989 |
Current liabilities |  |  | (306) |
Long-term liabilities |  |  | (1,118) |
Total equity |  |  | (1,805) |
Equity attributable to non-controlling interests |  |  | $ (732) |
Non-controlling interests’ share (per cent) | 39.90% |  | 39.90% |

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