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Related Parties - Summary of Transactions Between Related Parties (Parentheticals) (Details) ₩ in Millions | 12 Months Ended
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Dec. 31, 2022 KRW (₩)
Disclosure of transactions between related parties [line items] |
Loans transactions between related parties | ₩ 302,106
Korea Gas Corporation [Member] | Korea Midland Power [Member] | Fuel Swap [Member] |
Disclosure of transactions between related parties [line items] |
Loans transactions between related parties | 514,405
Borrowings transactions with related parties | 460,903
GS Donghae Electric Power Co., Ltd. [Member] | Korean Western Power Co Limited And Korean Eastern Power Co Ltd [Member] | Fuel Swap [Member] |
Disclosure of transactions between related parties [line items] |
Loans transactions between related parties | 5,590
Borrowings transactions with related parties | ₩ 20,113

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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- Definition Borrowings transactions between related parties. + References No definition available. + Details
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- Definition Loans transactions between related parties. + References No definition available. + Details
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Namespace Prefix: | kep_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=kep_KoreaMidlandPowerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | kep_TransactionDetailsAxis=kep_FuelSwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_SignificantInvestmentsInAssociatesAxis=kep_GSDonghaeElectricPowerMember
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |