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Non-Controlling Interests - Earnings of Subsidiaries with Non-Controlling Interests (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of subsidiaries [line items] |  |  |
Revenues | $ 2,347 | $ 2,249 | $ 2,307
Net earnings (loss) | 176 | (90) | (118)
Total comprehensive income (loss) | 131 | (86) | (43)
Amounts attributable to the non-controlling interests: |  |  |
Net earnings | 94 | 108 | 42
Total comprehensive income | 77 | 124 | 31
TransAlta Renewables |  |  |
Disclosure of subsidiaries [line items] |  |  |
Revenues | 446 | 462 | 459
Net earnings (loss) | 183 | 241 | 13
Total comprehensive income (loss) | 138 | 281 | (24)
Amounts attributable to the non-controlling interests: |  |  |
Net earnings | 73 | 94 | 11
Total comprehensive income | 56 | 110 | 0
Distributions paid to non-controlling interests | 69 | 79 | 85
TransAlta Cogeneration L.P. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Revenues | 181 | 185 | 175
Net earnings (loss) | 43 | 29 | 61
Total comprehensive income (loss) | 43 | 29 | 61
Amounts attributable to the non-controlling interests: |  |  |
Net earnings | 21 | 14 | 31
Total comprehensive income | 21 | 14 | 31
Distributions paid to non-controlling interests | $ 37 | $ 86 | $ 87

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