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Related Parties - Summary of Guarantees Provided To Related Parties (Parentheticals) (Details) $ in Thousands, ₩ in Millions | 12 Months Ended |  |
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Dec. 31, 2024 KRW (₩) | Dec. 31, 2024 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 KRW (₩)
Disclosure of Guarantees provided between the related parties [Line Items] |  |  |  |
Financial assets | ₩ 26,197,311 |  |  | ₩ 25,175,820
Pulau indah power plant sdn shares |  |  |  |
Disclosure of Guarantees provided between the related parties [Line Items] |  |  |  |
Financial assets | 50,721 |  |  |
Interlender loan agreement |  |  |  |
Disclosure of Guarantees provided between the related parties [Line Items] |  |  |  |
Guaranteed letter of credit | $ |  |  | $ 8,000 |
KEPXe Pian Xe Namnoy Power [Member] |  |  |  |
Disclosure of Guarantees provided between the related parties [Line Items] |  |  |  |
Provision of guarantees or collateral by entity | $ |  | $ 5,000 |  |
Derivative liabilities [Member] |  |  |  |
Disclosure of Guarantees provided between the related parties [Line Items] |  |  |  |
Provision of guarantees or collateral by entity | 26,422 |  |  |
Acquisition cost of the securities [Member] |  |  |  |
Disclosure of Guarantees provided between the related parties [Line Items] |  |  |  |
Provision of guarantees or collateral by entity | 47,067 |  |  |
Other provisions |  |  |  |
Disclosure of Guarantees provided between the related parties [Line Items] |  |  |  |
Provision of guarantees or collateral by entity | ₩ 11,804 |  |  |

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- Definition The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Classes of financial instruments [domain]; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 25 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_25&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 35H -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_35H&doctype=Standard -URIDate 2024-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 35M -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_35M&doctype=Standard -URIDate 2024-03-27 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 35N -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_35N&doctype=Standard -URIDate 2024-03-27 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 35I -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_35I&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of guarantees or collateral provided by the entity in related party transactions. [Refer: Guarantees [member]; Total for all related parties [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 24 -IssueDate 2024-01-01 -Paragraph 21 -Subparagraph h -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=24&code=ifrs-tx-2024-en-r&anchor=para_21_h&doctype=Standard -URIDate 2024-03-27 + Details
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