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Business Acquisitions (Details) $ / shares in Units, shares in Millions, $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Nov. 02, 2023 CAD ($) | Oct. 05, 2023 CAD ($) shares $ / shares | Dec. 31, 2023 CAD ($)
Disclosure of detailed information about business combination [line items] |  |  |
Changes in non-controlling interests in TransAlta Renewables (Note 4) |  |  | $ (809)
Committed |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Facility size |  |  | 2,590
Committed | TransAlta syndicated credit facility |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Facility size |  |  | 1,950
Deficit |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Changes in non-controlling interests in TransAlta Renewables (Note 4) |  |  | (625)
Attributable to non-controlling interests |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Changes in non-controlling interests in TransAlta Renewables (Note 4) |  |  | (630)
Other |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Change in ownership of TransAlta Renewables |  |  | (64)
Heartland Generation |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Purchase price | $ 390 |  |
Debt assumed | 268 |  |
Aggregate consideration | $ 658 |  |
TransAlta Renewables Inc. |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Aggregate consideration |  | $ 1,300 |
Cash consideration |  | $ 800 |
Common shares issued (in shares) | shares |  | 46 |
Value of common shares issued |  | $ 514 |
Price per share of shares issued | $ / shares |  | $ 11.06 |
Transaction costs |  | $ 11 |
TransAlta Renewables Inc. | Committed | TransAlta syndicated credit facility |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Additional borrowings |  | 700 |
Facility size |  | 2,000 |
TransAlta Renewables Inc. | Issued capital |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Transaction costs |  | 4 | $ 4
TransAlta Renewables Inc. | Deficit |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Transaction costs |  | $ 7 |

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