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Credit Facilities, Long-Term Debt and Lease Liabilities - Credit facilities summarized (Details) - CAD ($) $ in Millions | Dec. 31, 2024 | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | --- | ---
Disclosure of detailed information about borrowings [line items] |  |  |
Cash drawings | $ 3,808 |  | $ 3,466
Cash collateral | 9 |  | 9
Committed |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Facility size | 2,916 |  |
Outstanding letters of credit | 645 |  |
Cash drawings | 769 |  |
Available capacity | 1,502 |  |
Non-committed |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Facility size | 400 |  |
Outstanding letters of credit | 220 |  |
Cash drawings | 0 |  |
Available capacity | 180 |  |
TransAlta Renewables Inc. |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Cash collateral | 124 |  |
Syndicated credit facility | Committed |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Facility size | 1,950 |  |
Outstanding letters of credit | 456 |  |
Cash drawings | 145 |  |
Available capacity | 1,349 |  |
Bilateral credit facilities | Committed |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Facility size | 240 |  |
Outstanding letters of credit | 161 |  |
Cash drawings | 0 |  |
Available capacity | 79 |  |
Term Facility |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Cash drawings | 400 |  | $ 397
Term Facility | Committed |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Facility size | 400 |  |
Outstanding letters of credit | 0 |  |
Cash drawings | 400 |  |
Available capacity | 0 |  |
Heartland Credit Facilities | Committed |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Facility size | 276 |  |
Outstanding letters of credit | 14 |  |
Cash drawings | 224 |  |
Available capacity | 38 |  |
Heartland EDC letter of credit facility | Committed |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Facility size | 50 |  |
Outstanding letters of credit | 14 |  |
Cash drawings | 0 |  |
Available capacity | 36 |  |
Demand facilities | TransAlta Renewables Inc. | Non-committed |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Facility size |  | $ 400 |
Outstanding letters of credit | 220 |  |
Cash drawings | 0 |  |
Available capacity | $ 180 |  |

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