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Construction Contracts - Additional Information (Details) ₩ in Millions | 12 Months Ended
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Dec. 31, 2024 KRW (₩)
Construction contracts |
Accumulated Earned Revenue Expense And Others [Line Items] |
Revenue that was included in contract liability balance at beginning of period | ₩ 247,819

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- Definition The amount of revenue that was included in the contract liability balance at the beginning of the period. [Refer: Contract liabilities; Revenue from contracts with customers] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2024-01-01 -Paragraph 116 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2024-en-r&anchor=para_116_b&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_RevenueThatWasIncludedInContractLiabilityBalanceAtBeginningOfPeriod
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Accumulated earned revenue expense and others. + References No definition available. + Details
Name: | kep_AccumulatedEarnedRevenueExpenseAndOthersLineItems
Namespace Prefix: | kep_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_TypesOfContractsAxis=kep_ConstructionContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |