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v3.21.1

Litigation Case (Details) ₩ in Millions | Dec. 31, 2020 KRW (₩) ₩ / shares | Dec. 31, 2019 KRW (₩) ₩ / shares
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As the defendant |  |
Litigation Case [Line Items] |  |
Number of cases | ₩ / shares | 663 | 586
Claim amount | ₩ | ₩ 550,535 | ₩ 697,835
As the plaintiff |  |
Litigation Case [Line Items] |  |
Number of cases | ₩ / shares | 200 | 199
Claim amount | ₩ | ₩ 729,798 | ₩ 707,287

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Namespace Prefix: | kep_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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Name: | kep_NumberOfCases
Namespace Prefix: | kep_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | srt_LitigationCaseAxis=kep_LitigationAsTheDefendantMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_LitigationCaseAxis=kep_LitigationAsThePlaintiffMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |