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Credit Facilities, Long-Term Debt and Lease Liabilities - Restricted Cash and Letters of Credit (Details) - CAD ($) | Dec. 31, 2021 | Dec. 31, 2020
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US Wind Projects - Big Level |  |
Disclosure of detailed information about borrowings [line items] |  |
Restricted cash (Note 22) | $ 0 | $ 9,000,000
Letter of credit |  |
Disclosure of detailed information about borrowings [line items] |  |
Exposure to credit risk on loan commitments and financial guarantee contracts | 902,000,000 | 621,000,000
Amount exercised under letters of credit | 0 | 0
TransAlta OCP |  |
Disclosure of detailed information about borrowings [line items] |  |
Restricted cash (Note 22) | 17,000,000 | 17,000,000
TEC |  |
Disclosure of detailed information about borrowings [line items] |  |
Restricted cash (Note 22) | 53,000,000 | $ 45,000,000
Uncommitted demand letter facility |  |
Disclosure of detailed information about borrowings [line items] |  |
Maximum borrowing capacity under line of credit | 150,000,000 |
Uncommitted demand letter facility | TransAlta Renewables Inc. |  |
Disclosure of detailed information about borrowings [line items] |  |
Maximum borrowing capacity under line of credit | 150,000,000 |
Uncommitted Demand Letter Facility 2 |  |
Disclosure of detailed information about borrowings [line items] |  |
Maximum borrowing capacity under line of credit | 100,000,000 |
Bilateral Committed Credit Facilities |  |
Disclosure of detailed information about borrowings [line items] |  |
Maximum borrowing capacity under line of credit | $ 240,000,000 |

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