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Credit Facilities, Long-Term Debt and Lease Liabilities - Credit Facilities (Details) - CAD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Disclosure of detailed information about borrowings [line items] |  |  |  |
Outstanding letters of credit | $ 902 |  |  |
Available capacity | 1,288 | $ 1,500 |  |
Cash and cash equivalents | 947 | 703 | $ 411 | $ 89
Canadian committed bilateral credit facilities |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Outstanding letters of credit | 186 |  |  |
Available capacity | 54 |  |  |
Sustainability Linked Loan |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Maximum borrowing capacity under line of credit | 1,300 |  |  |
Letter of credit |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Debt instruments issued | 157 |  |  |
Credit facilities | Committed credit facilities |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Undrawn borrowing capacity under line of credit | 1,300 | 1,500 |  |
Corporation and TransAlta Renewables | Syndicated Bank Credit Facility |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Maximum borrowing capacity under line of credit | 2,000 | 2,000 |  |
TransAlta OCP |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Restricted cash (Note 22) | 17 | $ 17 |  |
Restricted cash and cash equivalents, principal amount | $ 17 |  |  |

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