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Credit Facilities, Long-Term Debt and Lease Liabilities - Credit Facilities (Details) - CAD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of detailed information about borrowings [line items] |  |  |  |
Cash and cash equivalents | $ 1,134 | $ 947 | $ 703 | $ 411
Revolving Term Facility [Member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Floating rate term | 2 years |  |  |
Letter of credit |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Debt instruments issued | $ 218 |  |  |
Committed syndicated bank facility | Committed credit facilities |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Undrawn borrowing capacity | 1,000 | 1,300 |  |
TransAlta OCP |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Restricted cash | 17 | $ 17 |  |
Restricted cash principal amount | $ 17 |  |  |

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