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Related Party Transactions (Details) $ in Millions, $ in Millions, $ in Millions | Nov. 05, 2021 USD ($) MW | Apr. 01, 2021 CAD ($) MW | Feb. 26, 2021 CAD ($) MW | Oct. 22, 2020 CAD ($) | Oct. 22, 2020 AUD ($) | Aug. 01, 2020 CAD ($) | Dec. 31, 2021 CAD ($) | Dec. 31, 2021 USD ($) | Dec. 23, 2020 MW
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Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Receivables due from associates |  |  |  |  |  |  | $ (18) | $ (14) |
US Wind Projects |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Notes and debentures issued |  |  |  |  |  |  | $ 7 | $ 6 |
WindCharger Battery Storage Project |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Consideration received |  |  |  |  |  | $ 12 |  |  |
TransAlta Renewables Inc. |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Proceeds from redemption of intercompany securities |  |  |  | $ 480 | $ 515 |  |  |  |
Amount receivable from employees |  |  |  |  | $ 200 |  |  |  |
Interest rate |  |  |  |  | 4.32% |  |  |  |
Windrise Wind Facility |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Capacity of facility (in megawatts) | MW |  |  | 206 |  |  |  |  |  | 206
Skookumchuck |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Capacity of facility (in megawatts) | MW |  | 137 |  |  |  |  |  |  |
Ada Cogeneration Facility |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Capacity of facility (in megawatts) | MW |  | 29 |  |  |  |  |  |  |
TransAlta Renewables Inc. |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Consideration received |  |  | $ 213 |  |  |  |  |  |
TransAlta Renewables Inc. | Windrise Wind Facility |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired |  |  |  |  |  |  |  |  | 100.00%
TransAlta Renewables Inc. | Skookumchuck |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired |  | 49.00% |  |  |  |  |  |  |
Consideration received |  | $ 103 |  |  |  |  |  |  |
TransAlta Renewables Inc. | Ada Cogeneration Facility |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired |  | 100.00% |  |  |  |  |  |  |
Consideration received |  | $ 43 |  |  |  |  |  |  |
TransAlta Renewables Inc. | Solar Facilities In North Carolina |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired | 100.00% |  |  |  |  |  |  |  |
Capacity of facility (in megawatts) | MW | 122 |  |  |  |  |  |  |  |
Consideration received | $ 102 |  |  |  |  |  |  |  |

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