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Accumulated Other Comprehensive Loss (Tables) | 12 Months Ended
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Dec. 31, 2023
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:
| 2023 |  | 2022
Currency translation adjustment |  |  |
Opening balance, Jan. 1 | (39) |  |  | (35) |
(Losses) gains on translating net assets of foreign operations, net of reclassifications to net earnings, net of tax | (6) |  |  | 21 |
Gains (losses) on financial instruments designated as hedges of foreign operations, net of reclassifications to net earnings, net of tax(1) | 9 |  |  | (25) |
Balance, Dec. 31 | (36) |  |  | (39) |
Cash flow hedges |  |  |
Opening balance, Jan. 1 | (228) |  |  | 228 |
Gains (losses) on derivatives designated as cash flow hedges, net of reclassifications to net earnings and to non-financial assets, net of tax(2) | 99 |  |  | (456) |
Balance, Dec. 31 | (129) |  |  | (228) |
Employee future benefits |  |  |
Opening balance, Jan. 1 | 8 |  |  | (29) |
Net actuarial gains on defined benefit plans, net of tax(3) | (5) |  |  | 37 |
Balance, Dec. 31 | 3 |  |  | 8 |
Other |  |  |
Opening balance, Jan. 1 | 37 |  |  | (18) |
Change in ownership of TransAlta Renewables | (64) |  |  | — |
Intercompany and third-party investments at FVTOCI | 25 |  |  | 55 |
Balance, Dec. 31 | (2) |  |  | 37 |
Accumulated other comprehensive loss | (164) |  |  | (222) |
(1)Net of income tax expense of $1 million for the year ended Dec. 31, 2023 (Dec. 31, 2022 – $3 million recovery). (2)Net of income tax expense of $27 million for the year ended Dec. 31, 2023 (Dec. 31, 2022 – $112 million recovery). (3)Net of income tax recovery of $1 million for the year ended Dec. 31, 2023 (Dec. 31, 2022 – $12 million).

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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 2023-01-01 -Paragraph 106A -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_106A&doctype=Standard -URIDate 2023-03-23 + Details
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