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Litigation Case (Details) ₩ in Millions | Dec. 31, 2018 KRW (₩) ₩ / shares | Dec. 31, 2017 KRW (₩) ₩ / shares
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As the defendant |  |
Litigation Case [Line Items] |  |
Number of cases | ₩ / shares | 570 | 565
Claim amount | ₩ | ₩ 673,882 | ₩ 477,719
As the plaintiff |  |
Litigation Case [Line Items] |  |
Number of cases | ₩ / shares | 174 | 185
Claim amount | ₩ | ₩ 793,491 | ₩ 690,934

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

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Namespace Prefix: | kep_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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: |