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Related Party Transactions - Disclosure of Interests in Subsidiaries (Details)	12 Months Ended
	Dec. 31, 2024
Canada | TransAlta Generation Partnership
Disclosure of subsidiaries [line items]
Ownership interest (as a percent)	100.00%
Canada | TransAlta Cogeneration, L.P.
Disclosure of subsidiaries [line items]
Ownership interest (as a percent)	50.01%
Canada | TransAlta Energy Marketing Corp.
Disclosure of subsidiaries [line items]
Ownership interest (as a percent)	100.00%
Canada | TransAlta Renewables Inc.
Disclosure of subsidiaries [line items]
Ownership interest (as a percent)	100.00%
Canada | Heartland Generation Ltd.
Disclosure of subsidiaries [line items]
Ownership interest (as a percent)	100.00%
Canada | Alberta Power (2000) Ltd.
Disclosure of subsidiaries [line items]
Ownership interest (as a percent)	100.00%
U.S. | Skookumchuck
Disclosure of subsidiaries [line items]
Proportion of ownership interest in joint venture	49.00%
U.S. | TransAlta Centralia Generation, LLC
Disclosure of subsidiaries [line items]
Ownership interest (as a percent)	100.00%
U.S. | TransAlta Energy Marketing (U.S.), Inc.
Disclosure of subsidiaries [line items]
Ownership interest (as a percent)	100.00%
Australia | TransAlta Energy (Australia), Pty Ltd.
Disclosure of subsidiaries [line items]
Ownership interest (as a percent)	100.00%

X

- 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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The proportion of ownership interest in a joint venture attributable to the entity. [Refer: Total for all joint ventures [member]]

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