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Related Parties - Summary of Guarantees Provided To Related Parties (Parentheticals) (Details) $ in Thousands, ₩ in Millions	12 Months Ended
	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

X

- 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
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-URIDate 2024-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-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
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-URIDate 2024-03-27

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_35I&doctype=Standard
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X

- 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
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-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

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X

- References

No definition available.

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X

- Definition

Guaran teed Letter of Credit.

+ References

No definition available.

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X

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X

- Details

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