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Non-Controlling Interests - Earnings of Subsidiaries with Non-Controlling Interests (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disclosure of subsidiaries [line items] |  |  |
Revenues | $ 2,976 | $ 2,721 | $ 2,101
Net earnings (loss) | 161 | (425) | (253)
Total comprehensive income (loss) | (263) | (610) | (355)
Amounts attributable to the non-controlling interests: |  |  |
Net earnings (loss) | 111 | 112 | 34
Total comprehensive income (loss) | 55 | 83 | 84
TransAlta Renewables Inc. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Revenues | 560 | 470 | 436
Net earnings (loss) | 74 | 139 | 97
Total comprehensive income (loss) | (67) | 66 | 223
Amounts attributable to the non-controlling interests: |  |  |
Net earnings (loss) | 20 | 50 | 40
Total comprehensive income (loss) | (36) | 21 | 90
Dividends paid to non-controlling interests | 100 | 100 | 80
TransAlta Cogeneration, L.P. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Revenues | 347 | 265 | 146
Net earnings (loss) | 143 | 103 | (13)
Total comprehensive income (loss) | 143 | 103 | (13)
Amounts attributable to the non-controlling interests: |  |  |
Net earnings (loss) | 91 | 62 | (6)
Total comprehensive income (loss) | 91 | 62 | (6)
Dividends paid to non-controlling interests | $ 87 | $ 56 | $ 17

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