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Non-Controlling Interests - Share of Ownership and Equity Participation in TransAlta Renewables (Details)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
TransAlta Cogeneration, L.P.
Disclosure of subsidiaries [line items]
Proportion of ownership interests held by non-controlling interests	49.99%	49.99%
TransAlta Cogeneration, L.P. | TransAlta Cogeneration, L.P.
Disclosure of subsidiaries [line items]
Proportion of ownership interests held by non-controlling interests	49.99%
Kent Hills wind farm | TransAlta Renewables Inc.
Disclosure of subsidiaries [line items]
Proportion of ownership interests held by non-controlling interests	17.00%
TransAlta Renewables Inc.
Disclosure of subsidiaries [line items]
Proportion of ownership interests held by non-controlling interests	39.90%	39.90%

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- Definition

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The proportion of ownership interests in a subsidiary held by non-controlling interests. [Refer: Subsidiaries [member]; Non-controlling interests]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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