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Provisions - Summary of Provisions (Parenthetical) (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Transmission regional support program provisions [Member] |  |
Disclosure of other provisions [line items] |  |
Asset recognised for expected reimbursement, other provisions | ₩ 46,444 | ₩ 38,997

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- Definition The amount of assets that have been recognised for the expected reimbursement of other provisions. [Refer: Expected reimbursement, other provisions; Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2024-01-01 -Paragraph 85 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2024-en-r&anchor=para_85_c&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_AssetRecognisedForExpectedReimbursementOtherProvisions
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfOtherProvisionsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_ClassesOfProvisionsAxis=kep_TransmissionRegionalSupportProgramProvisionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |