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Basis of Preparation - Additional Information (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Unbilled Revenue [Member] |  |
Disclosure Of Basis Of Preparation Of Financial Statements [Line Items] |  |
Unbilled revenue recognized | ₩ 1,725,444 | ₩ 1,691,294

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- Definition Contract assets from unmetered electricity supply. + References No definition available. + Details
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Namespace Prefix: | kep_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Disclosure of basis of preparation of financial statements. + 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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- Details
Name: | kep_BillingStatusTypeAxis=kep_UnbilledRevenueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |