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Non-Controlling Interests - Financial Position of Non-Controlling Interests (Details) - CAD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disclosure of subsidiaries [line items] |  |  |
Current assets | $ 3,714 | $ 2,197 |
Current liabilities | (2,888) | (1,931) |
Total equity | 1,989 | 2,593 | $ 3,436
Non-controlling interests | 879 | 1,011 |
TransAlta Renewables Inc. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current assets | 240 | 430 |
Long-term assets | 2,989 | 3,319 |
Current liabilities | (306) | (593) |
Long-term liabilities | (1,118) | (1,033) |
Total equity | (1,805) | (2,123) |
Non-controlling interests | $ (732) | $ (869) |
Non-controlling interests’ share (per cent) | 39.90% | 39.90% |
TransAlta Cogeneration, L.P. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current assets | $ 127 | $ 66 |
Long-term assets | 253 | 312 |
Current liabilities | (62) | (52) |
Long-term liabilities | (27) | (36) |
Total equity | (291) | (290) |
Non-controlling interests | $ (147) | $ (142) |
Non-controlling interests’ share (per cent) | 49.99% | 49.99% |

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