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Restricted Deposits - Summary of Restricted Deposits (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Restricted Deposits [Line Items] |  |
Total Restricted Deposits | ₩ 1,302,733 | ₩ 1,310,402
Cash and cash equivalents |  |
Restricted Deposits [Line Items] |  |
Escrow accounts | 3,010 | 2,912
Deposits for government project | 26,969 | 30,586
Collateral provided for borrowings | 190,525 | 250,346
Collateral provided for lawsuit | 54 | 57
Deposits for transmission regional support program | 9,481 | 8,626
Deposits for other business purposes | 5,550 | 3,825
Short-term financial instruments |  |
Restricted Deposits [Line Items] |  |
Collateral provided for borrowings | 24,728 | 1,000
Restriction on withdrawal related to 'win-win growth program' for small and medium enterprises | 80,500 | 101,500
Non-Current financial assets at fair value through profit or loss |  |
Restricted Deposits [Line Items] |  |
Decommissioning costs of nuclear power plants | 271,047 | 386,220
Long-term financial instruments |  |
Restricted Deposits [Line Items] |  |
Escrow accounts | 0 | 1,603
Collateral provided for borrowings | 28,245 | 21,745
Decommissioning costs of nuclear power plants | 655,030 | 497,609
Guarantee deposits for banking accounts at oversea branches | 36 | 18
Other Non-current assets |  |
Restricted Deposits [Line Items] |  |
Deposits for other business purposes | ₩ 7,558 | ₩ 4,355

X
- Definition Deposits for other business purposes. + References No definition available. + Details
Name: | kep_DepositsForOtherBusinessPurposes
Namespace Prefix: | kep_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Escrow deposit. + References No definition available. + Details
Name: | kep_EscrowDeposit
Namespace Prefix: | kep_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Restricted cash and investments. + References No definition available. + Details
Name: | kep_RestrictedCashAndInvestments
Namespace Prefix: | kep_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Definition Restricted cash collateral provided for borrowings. + References No definition available. + Details
Name: | kep_RestrictedCashCollateralProvidedForBorrowings
Namespace Prefix: | kep_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Restricted cash collateral provided for lawsuit. + References No definition available. + Details
Name: | kep_RestrictedCashCollateralProvidedForLawsuit
Namespace Prefix: | kep_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Restricted cash deposits for government project. + References No definition available. + Details
Name: | kep_RestrictedCashDepositsForGovernmentProject
Namespace Prefix: | kep_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Restricted cash deposits for transmission regional support program. + References No definition available. + Details
Name: | kep_RestrictedCashDepositsForTransmissionRegionalSupportProgram
Namespace Prefix: | kep_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Restricted guarantee deposits for banking accounts at oversea branches. + References No definition available. + Details
Name: | kep_RestrictedGuaranteeDepositsForBankingAccountsAtOverseaBranches
Namespace Prefix: | kep_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Restricted noncurrent available for sale financial asset decommissioning costs of nuclear power plants. + References No definition available. + Details
Name: | kep_RestrictedNoncurrentAvailableForSaleFinancialAssetDecommissioningCostsOfNuclearPowerPlants
Namespace Prefix: | kep_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Restriction on withdrawal related to winwin growth program for small and medium enterprises. + References No definition available. + Details
Name: | kep_RestrictionOnWithdrawalRelatedToWinwinGrowthProgramForSmallAndMediumEnterprises
Namespace Prefix: | kep_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | ifrs-full_CategoriesOfFinancialAssetsAxis=kep_CashAndCashEquivalentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CategoriesOfFinancialAssetsAxis=kep_ShortTermFinancialInstrumentsCategoryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CategoriesOfFinancialAssetsAxis=kep_NonCurrentFinancialAssetsAtFairValueThroughProfitOrLossCategoryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CategoriesOfFinancialAssetsAxis=kep_LongTermFinancialInstrumentsCategoryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CategoriesOfFinancialAssetsAxis=kep_OtherNoncurrentAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |