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Non-Controlling Interests - Financial Position of Non-Controlling Interests (Details) - CAD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of subsidiaries [line items] |  |  |
Current assets | $ 2,197 | $ 1,902 |
Current liabilities | (1,931) | (935) |
Total equity | 2,593 | 3,436 | $ 4,062
Non-controlling interests | 1,011 | 1,084 |
TransAlta Renewables Inc. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current assets | 430 | 743 |
Long-term assets | 3,319 | 2,913 |
Current liabilities | (593) | (364) |
Long-term liabilities | (1,033) | (987) |
Total equity | (2,123) | (2,305) |
Non-controlling interests | $ (869) | $ (948) |
Ownership and voting rights percentage | 39.90% | 39.90% |
TransAlta Cogeneration, L.P. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current assets | $ 66 | $ 69 |
Long-term assets | 312 | 323 |
Current liabilities | (52) | (78) |
Long-term liabilities | (36) | (37) |
Total equity | (290) | (277) |
Non-controlling interests | $ (142) | $ (136) |
Ownership and voting rights percentage | 49.99% | 49.99% |
TransAlta Cogeneration, L.P. | TransAlta Cogeneration, L.P. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Ownership and voting rights percentage | 49.99% |  |

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