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Related Party Transactions - Narrative (Details) $ in Millions, $ in Millions, $ in Millions | Apr. 01, 2022 CAD ($) | Nov. 05, 2021 USD ($) MW | Feb. 26, 2021 CAD ($) MW | Aug. 01, 2020 CAD ($) | Dec. 31, 2022 CAD ($) | Oct. 23, 2022 AUD ($) | Dec. 31, 2021 CAD ($) | Dec. 31, 2021 USD ($) | Apr. 01, 2021 MW
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Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Receivables due from associates |  |  |  |  |  |  | $ (18) | $ (14) |
Cash drawings |  |  |  |  | $ 3,653 |  | 3,267 |  |
TransAlta Renewables Inc. |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Cash drawings |  |  |  |  |  | $ 157 |  |  |
US Wind Projects |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Exchangeable debentures |  |  |  |  |  |  | $ 7 | $ 6 |
WindCharger Battery Storage Project |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Aggregate consideration |  |  |  | $ 12 |  |  |  |  |
TransAlta Renewables Inc. |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Aggregate consideration |  |  | $ 213 |  |  |  |  |  |
Solar Facilities In North Carolina | TransAlta Renewables Inc. |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Membership interest |  | 100.00% |  |  |  |  |  |  |
Capacity of facility (in megawatts) | MW |  | 122 |  |  |  |  |  |  |
Aggregate consideration |  | $ 102 |  |  |  |  |  |  |
Ada Cogeneration Facility |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Capacity of facility (in megawatts) | MW |  |  |  |  |  |  |  |  | 29
Ada Cogeneration Facility | TransAlta Renewables Inc. |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Membership interest |  |  |  |  |  |  |  |  | 100.00%
Aggregate consideration | $ 43 |  |  |  |  |  |  |  |
Skookumchuck |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Capacity of facility (in megawatts) | MW |  |  |  |  |  |  |  |  | 137
Skookumchuck | TransAlta Renewables Inc. |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Membership interest |  |  |  |  |  |  |  |  | 49.00%
Aggregate consideration | $ 103 |  |  |  |  |  |  |  |
Windrise Wind Facility |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Capacity of facility (in megawatts) | MW |  |  | 206 |  |  |  |  |  |
Windrise Wind Facility | TransAlta Renewables Inc. |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Membership interest |  |  | 100.00% |  |  |  |  |  |

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