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Credit Facilities, Long-Term Debt and Lease Liabilities - Restricted Cash and Letters of Credit (Details) - CAD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Letter of credit |  |
Disclosure of detailed information about borrowings [line items] |  |
Bonds issued | $ 782 | $ 1,175
Exercised amount | 0 | 0
Uncommitted demand letter facility |  |
Disclosure of detailed information about borrowings [line items] |  |
Outstanding letters of credit | 187 |
Committed |  |
Disclosure of detailed information about borrowings [line items] |  |
Facility size | 2,590 |
Outstanding letters of credit | 595 |
Committed | TransAlta syndicated credit facility |  |
Disclosure of detailed information about borrowings [line items] |  |
Facility size | 1,950 |
Outstanding letters of credit | 417 |
Committed | TransAlta bilateral credit facilities |  |
Disclosure of detailed information about borrowings [line items] |  |
Facility size | 240 |
Outstanding letters of credit | 178 |
Non-Committed |  |
Disclosure of detailed information about borrowings [line items] |  |
Facility size | 400 |
Outstanding letters of credit | 187 |
Non-Committed | TransAlta demand facilities |  |
Disclosure of detailed information about borrowings [line items] |  |
Facility size | 400 |
Outstanding letters of credit | 187 |
TransAlta OCP |  |
Disclosure of detailed information about borrowings [line items] |  |
Restricted cash | 17 | 17
TEC |  |
Disclosure of detailed information about borrowings [line items] |  |
Restricted cash | $ 52 | $ 53

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