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Credit Facilities, Long-Term Debt and Lease Liabilities - Credit Facilities (Details) - CAD ($) $ in Millions | Dec. 31, 2024 | Dec. 04, 2024 | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | --- | --- | ---
Disclosure of detailed information about borrowings [line items] |  |  |  |
Cash drawings | $ 3,808 |  |  | $ 3,466
Heartland Generation |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Credit facilities, long-term debt and lease liabilities (Note 25) |  | $ 204 |  |
Heartland Generation, Post Adjustments |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Credit facilities, long-term debt and lease liabilities (Note 25) |  | 232 |  |
Non-committed |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Facility size | 400 |  |  |
Cash drawings | 0 |  |  |
Outstanding letters of credit | 220 |  |  |
Non-committed | Demand facilities | TransAlta Renewables Inc. |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Facility size |  |  | $ 400 |
Cash drawings | 0 |  |  |
Outstanding letters of credit | 220 |  |  |
Committed |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Facility size | 2,916 |  |  |
Cash drawings | 769 |  |  |
Outstanding letters of credit | 645 |  |  |
Committed | Heartland Credit Facilities |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Facility size | 276 |  |  |
Cash drawings | 224 |  |  |
Outstanding letters of credit | 14 |  |  |
Committed | Heartland Credit Facilities, Revolving Facility |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Facility size |  | $ 25 |  |
Committed | Heartland Credit Facilities, Letter Of Credit |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Facility size | 27 |  |  |
Outstanding letters of credit | 14 |  |  |
Committed | Heartland EDC letter of credit facility |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Facility size | 50 |  |  |
Cash drawings | 0 |  |  |
Outstanding letters of credit | $ 14 |  |  |

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- Definition The amount of outstanding funds that the entity is obligated to repay. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_55&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount recognised as of the acquisition date for borrowings assumed in a business combination. [Refer: Borrowings; Total for all business combinations [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 3 -IssueDate 2024-01-01 -Paragraph B64 -Subparagraph i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2024-en-r&anchor=para_B64_i&doctype=Appendix&subtype=B -URIDate 2024-03-27 + Details
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