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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, 2023 CAD ($) | Dec. 31, 2023 AUD ($) | Dec. 31, 2022 CAD ($) | Dec. 31, 2021 CAD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |
Exchangeable securities | $ 744 |  | $ 739 |
Property, plant and equipment | 5,714 |  | 5,556 | $ 5,320
Intangible assets other than goodwill | 223 |  | 252 | 256
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 | 1,500 |  | 1,500 |
Intangible assets other than goodwill | 61 |  | 70 |
Non-recourse |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Exchangeable securities | 1,700 |  | 1,800 |
Restricted cash | 79 |  | 50 |
Non-recourse | Secured by first rate ranking charge over subsidiaries |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Notional amount | 1,400 |  | 1,400 |
Non-recourse | Secured by equity interests of the issuer |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Notional amount | 85 |  | 94 |
Restricted Use Debt |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Proceeds received | 3 | $ 3 |  |
Secured Debt | TransAlta OCP |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Notional amount | $ 217 |  | $ 241 |

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