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Restricted Deposits - Summary of Restricted Deposits (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Restricted Deposits [Line Items] |  |
Total Restricted Deposits | ₩ 1,400,071 | ₩ 1,302,733
Cash and cash equivalents |  |
Restricted Deposits [Line Items] |  |
Escrow accounts | 3,280 | 3,010
Deposits for government project | 30,812 | 26,969
Collateral provided for borrowings | 211,522 | 190,525
Collateral provided for lawsuit | 54 | 54
Deposits for transmission regional support program | 8,959 | 9,481
Deposits for other business purposes | 4,187 | 5,550
Short-term financial instruments |  |
Restricted Deposits [Line Items] |  |
Collateral provided for borrowings | 85,569 | 24,728
Restriction on withdrawal related to 'win-win growth program' for small and medium enterprises | 83,520 | 80,500
Non-Current financial assets at fair value through profit or loss |  |
Restricted Deposits [Line Items] |  |
Decommissioning costs of nuclear power plants | 296,496 | 271,047
Long-term financial instruments |  |
Restricted Deposits [Line Items] |  |
Collateral provided for borrowings | 6,500 | 28,245
Decommissioning costs of nuclear power plants | 660,000 | 655,030
Guarantee deposits for banking accounts at overseas branches | 22 | 36
Other Non-current assets |  |
Restricted Deposits [Line Items] |  |
Deposits for other business purposes | ₩ 9,150 | ₩ 7,558

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- 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 deposits. + References No definition available. + Details
Name: | kep_EscrowDeposits
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 deposits. + References No definition available. + Details
Name: | kep_RestrictedDeposits
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_CashAndCashEquivalentMember
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_OtherNoncurrentAssetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |