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Credit Facilities, Long-Term Debt and Lease Liabilities - Restrictions on Non-Recourse Debt and Security (Details) $ in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 CAD ($) | Dec. 31, 2024 AUD ($) | Dec. 31, 2023 CAD ($) | Dec. 31, 2022 CAD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |
Exchangeable securities | $ 750 |  |  |
Property, plant and equipment | 6,020 |  | $ 5,714 | $ 5,556
Intangible assets other than goodwill | 281 |  | 223 | 252
Annual cash payments | (40) |  | (40) | $ (40)
Annual cash payments, net | 37 |  |  |
TransAlta OCP |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Restricted cash | 17 |  | 17 |
Renewable generation facilities |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Property, plant and equipment | 1,750 |  | 1,500 |
Intangible assets other than goodwill | 84 |  | 61 |
Non-recourse |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Exchangeable securities | 1,800 |  | 1,700 |
Restricted cash | 117 |  | 79 |
Non-recourse | Secured by first rate ranking charge over subsidiaries |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Notional amount | 1,500 |  | 1,400 |
Non-recourse | Secured by equity interests of the issuer |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Notional amount | 75 |  | 85 |
Restricted Use Debt |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Proceeds received | 5 | $ 6 |  |
Secured Debt | TransAlta OCP |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Notional amount | $ 192 |  | $ 217 |

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