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Deferred Revenues (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Disclosure of deferred revenue [abstract] |  |
Deferred Revenue, Beginning Balance | ₩ 11,548,855 | ₩ 10,974,845
Increase | 2,924,341 | 1,317,061
Recognized as revenue | (820,631) | (743,051)
Deferred Revenue, Ending Balance | ₩ 13,652,565 | ₩ 11,548,855

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- Definition Deferred revenues. + References No definition available. + Details
Name: | kep_DeferredRevenues
Namespace Prefix: | kep_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | kep_DisclosureOfDeferredRevenueAbstract
Namespace Prefix: | kep_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Increase deferred revenue. + References No definition available. + Details
Name: | kep_IncreaseDeferredRevenue
Namespace Prefix: | kep_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Recognized as revenue deferred revenue. + References No definition available. + Details
Name: | kep_RecognizedAsRevenueDeferredRevenue
Namespace Prefix: | kep_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration