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Common Shares - Issued and Outstanding (Details) - CAD ($) shares in Millions, $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2023 | Oct. 05, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Common shares |  |  |  |
Provision for repurchase of common shares under ASPP | $ (19) |  |  |
TransAlta Renewables Inc. |  |  |  |
Common shares |  |  |  |
Transaction costs |  | $ 11 |  |
TransAlta Renewables Inc. | Issued capital |  |  |  |
Common shares |  |  |  |
Transaction costs |  | $ 4 | $ 4 |
Common shares |  |  |  |
Common shares |  |  |  |
Issued and outstanding, beginning of period |  |  | 268.1 | 271.0
Purchased and cancelled under the NCIB |  |  | (7.5) | (4.3)
Share-based payment plans |  |  | 0.8 | 0.9
Stock options exercised |  |  | 0.7 | 0.5
Issued for acquisition of TransAlta Renewables |  |  | 46.5 | 0.0
Provision for repurchase of common shares under ASPP |  |  | (1.7) |
Issued and outstanding, end of year | 306.9 |  | 306.9 | 268.1
Issued and outstanding, end of year |  |  | $ 2,863 | $ 2,901
Purchased and cancelled under the NCIB |  |  | (80) | (46)
Share-based payment plans |  |  | 6 | 5
Stock options exercised |  |  | 5 | 3
Issued for acquisition of TransAlta Renewables |  |  | 510 | 0
Provision for repurchase of common shares under ASPP |  |  | (19) |
Issued and outstanding, end of year | $ 3,285 |  | $ 3,285 | $ 2,863
Common shares | Prior To Automatic Share Purchase Plan |  |  |  |
Common shares |  |  |  |
Issued and outstanding, end of year | 308.6 |  | 308.6 |
Issued and outstanding, end of year | $ 3,304 |  | $ 3,304 |

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