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Restricted Deposits - Summary of Restricted Deposits (Parentheticals) (Details) ₩ in Millions | 12 Months Ended
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Dec. 31, 2021 KRW (₩)
Restricted Deposits [Abstract] |
Restricted Funds For Developing Small And Medium Enterprises Returned During Period | ₩ 200,000

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

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- Definition Restricted funds for developing small and medium enterprises returned during period. + References No definition available. + Details
Name: | kep_RestrictedFundsForDevelopingSmallAndMediumEnterprisesReturnedDuringPeriod
Namespace Prefix: | kep_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration