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Related Party Transactions - Disclosure of Interests in Subsidiaries (Details) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
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% | 60.10%
US | Skookumchuck |  |
Disclosure of subsidiaries [line items] |  |
Proportion of ownership interest in joint venture | 49.00% |
US | TransAlta Centralia Generation, LLC |  |
Disclosure of subsidiaries [line items] |  |
Ownership interest (as a percent) | 100.00% |
US | 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% |

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- Definition The proportion of ownership interest in a joint venture attributable to the entity. [Refer: Joint ventures [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2023-01-01 -Paragraph 17 -Subparagraph b -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2023-en-r&anchor=para_17_b_iii&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2023-01-01 -Paragraph 16 -Subparagraph b -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2023-en-r&anchor=para_16_b_iii&doctype=Standard -URIDate 2023-03-23 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2023-01-01 -Paragraph 21 -Subparagraph a -Clause iv -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2023-en-r&anchor=para_21_a_iv&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The proportion of ownership interest in a subsidiary attributable to the entity. [Refer: Subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2023-01-01 -Paragraph 17 -Subparagraph b -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2023-en-r&anchor=para_17_b_iii&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2023-01-01 -Paragraph 16 -Subparagraph b -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2023-en-r&anchor=para_16_b_iii&doctype=Standard -URIDate 2023-03-23 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2023-01-01 -Paragraph 19B -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2023-en-r&anchor=para_19B_c&doctype=Standard -URIDate 2023-03-23 + Details
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