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Accumulated Other Comprehensive Loss (Tables) | 12 Months Ended
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Dec. 31, 2024
Disclosure of analysis of other comprehensive income by item [abstract] |
Disclosure of changes in accumulated other comprehensive loss | The components of and changes in, accumulated other comprehensive loss are as follows:
| 2024 |  | 2023
Currency translation adjustment |  |  |
Opening balance, Jan. 1 | (36) |  |  | (39) |
Gains (losses) on translating net assets of foreign operations, net of reclassifications to net earnings, net of tax | 30 |  |  | (6) |
(Losses) gains on financial instruments designated as hedges of foreign operations, net of reclassifications to net earnings, net of tax(1) | (28) |  |  | 9 |
Balance, Dec. 31 | (34) |  |  | (36) |
Cash flow hedges |  |  |
Opening balance, Jan. 1 | (129) |  |  | (228) |
Gains on derivatives designated as cash flow hedges, net of reclassifications to net earnings and to non-financial assets, net of tax(2) | 194 |  |  | 99 |
Balance, Dec. 31 | 65 |  |  | (129) |
Employee future benefits |  |  |
Opening balance, Jan. 1 | 3 |  |  | 8 |
Net actuarial gains (losses) on defined benefit plans, net of tax(3) | 9 |  |  | (5) |
Balance, Dec. 31 | 12 |  |  | 3 |
Other |  |  |
Opening balance, Jan. 1 | (2) |  |  | 37 |
Change in ownership of TransAlta Renewables | — |  |  | (64) |
Intercompany and third-party investments at FVTOCI | — |  |  | 25 |
Balance, Dec. 31 | (2) |  |  | (2) |
Accumulated other comprehensive income (loss) | 41 |  |  | (164) |
(1)Net of income tax recovery of $4 million for the year ended Dec. 31, 2024 (Dec. 31, 2023 – $1 million expense). (2)Net of income tax expense of $53 million for the year ended Dec. 31, 2024 (Dec. 31, 2023 – $27 million). (3)Net of income tax expense of $3 million for the year ended Dec. 31, 2024 (Dec. 31, 2023 – $1 million recovery).

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- Definition The entire disclosure of the analysis of other comprehensive income by item. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 106A -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_106A&doctype=Standard -URIDate 2024-03-27 + Details
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