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Credit Facilities, Long-Term Debt and Lease Liabilities - Non-Recourse Debt and Other (Details) - CAD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Sep. 14, 2023 | May 08, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Cash and cash equivalents | $ 337 | $ 348 |  |  | $ 1,134 | $ 947
Non-committed |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Outstanding letters of credit | 220 |  |  |  |  |
Committed |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Outstanding letters of credit | 645 |  |  |  |  |
Non-recourse Pingston Power Inc Bond |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Notional amount |  |  | $ 39 | $ 46 |  |
Interest |  |  | 6.145% |  |  |
Committed credit facilities | Committed syndicated bank facility |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Undrawn borrowing capacity | 1,500 | $ 1,400 |  |  |  |
Syndicated credit facility | Committed |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Outstanding letters of credit | 456 |  |  |  |  |
Syndicated credit facility | Committed | TransAlta Renewables Inc. |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Cash and cash equivalents | $ 336 |  |  |  |  |

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