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Credit Facilities, Long-Term Debt and Lease Liabilities - Restricted Cash and Letters of Credit (Details) - CAD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Letter of credit |  |
Disclosure of detailed information about borrowings [line items] |  |
Outstanding letters of credit | $ 1,175 | $ 902
Exercised amount | 0 | 0
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 | 53 | $ 53
TransAlta Corporation bilateral credit facilities |  |
Disclosure of detailed information about borrowings [line items] |  |
Facility size | 240 |
Uncommitted demand letter facility |  |
Disclosure of detailed information about borrowings [line items] |  |
Outstanding letters of credit | 120 |
Uncommitted demand letter facility | TransAlta Renewables Inc. |  |
Disclosure of detailed information about borrowings [line items] |  |
Facility size | 150 |
Outstanding letters of credit | $ 98 |

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