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Non-Controlling Interests - Subsidiaries and Operations with Non-Controlling Interests (Details)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
TransAlta Cogeneration, L.P.
Disclosure of subsidiaries [line items]
Ownership interests	49.99%	49.99%
TransAlta Cogeneration, L.P. | TransAlta Cogeneration, L.P.
Disclosure of subsidiaries [line items]
Ownership interests	49.99%
TransAlta Renewables Inc.
Disclosure of subsidiaries [line items]
Ownership interests	39.90%	39.90%
Kent Hills wind farm | TransAlta Renewables Inc.
Disclosure of subsidiaries [line items]
Ownership interests	17.00%

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2022-03-24
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