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Non-Controlling Interests - Earnings of Subsidiaries with Non-Controlling Interests (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of subsidiaries [line items] |  |  |
Revenues | $ 2,721 | $ 2,101 | $ 2,347
Net earnings (loss) | (425) | (253) | 176
Total comprehensive earnings (loss) | (610) | (355) | 131
Amounts attributable to the non-controlling interests: |  |  |
Net earnings (loss) | 112 | 34 | 94
Total comprehensive earnings (loss) | 83 | 84 | 77
TransAlta Renewables Inc. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Revenues | 470 | 436 | 446
Net earnings (loss) | 139 | 97 | 183
Total comprehensive earnings (loss) | 66 | 223 | 138
Amounts attributable to the non-controlling interests: |  |  |
Net earnings (loss) | 50 | 40 | 73
Total comprehensive earnings (loss) | 21 | 90 | 56
Distributions paid to Canadian Power Holdings Inc. | 100 | 80 | 69
TransAlta Cogeneration, L.P. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Revenues | 265 | 146 | 181
Net earnings (loss) | 103 | (13) | 43
Total comprehensive earnings (loss) | 103 | (13) | 43
Amounts attributable to the non-controlling interests: |  |  |
Net earnings (loss) | 62 | (6) | 21
Total comprehensive earnings (loss) | 62 | (6) | 21
Distributions paid to Canadian Power Holdings Inc. | $ 56 | $ 17 | $ 37

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