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Credit Facilities, Long-Term Debt and Lease Liabilities - Restrictions on Non-Recourse Debt and Security (Details) $ in Millions, $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 20, 2018 CAD ($) | Dec. 31, 2021 CAD ($) | Dec. 31, 2022 CAD ($) | Dec. 31, 2022 AUD ($) | Dec. 31, 2021 CAD ($) | Dec. 31, 2020 CAD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Other borrowings |  | $ 735 | $ 739 |  | $ 735 |
PP&E |  | 5,320 | 5,556 |  | 5,320 | $ 5,822
Intangible assets |  | 256 | 252 |  | 256 | 313
Annual cash payments | $ 40 |  | 40 |  | 40 | $ 40
Annual cash payments, net |  | 37 |  |  |  |
TransAlta OCP |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Restricted cash |  | 17 | 17 |  | 17 |
Renewable generation facilities |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
PP&E |  | 1,500 | 1,500 |  | 1,500 |
Intangible assets |  | 78 | 70 |  | 78 |
Non-recourse debt |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Other borrowings |  | 1,900 | 1,800 |  | 1,900 |
Restricted cash |  | 67 | 50 |  | 67 |
Non-recourse debt | Secured by first rate ranking charge over subsidiaries |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Notional amount |  | 1,500 | 1,400 |  | 1,500 |
Non-recourse debt | Secured by equity interests of the issuer |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Notional amount |  | 103 | 94 |  | 103 |
Restricted Use Debt |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Proceeds received |  |  | 8 | $ 9 |  |
Kent Hills Wind Bonds |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Reserve account balance |  | 0 | 65 |  | 0 |
Secured Debt | TransAlta OCP |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Notional amount |  | $ 263 | $ 241 |  | $ 263 |

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