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Restricted Deposits - Summary of Restricted Deposits (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Restricted Deposits [Line Items] |  |
Total Restricted Deposits | ₩ 1,310,402 | ₩ 1,288,589
Cash and cash equivalents |  |
Restricted Deposits [Line Items] |  |
Escrow accounts | 2,912 | 0
Deposits for government project | 30,586 | 22,286
Collateral provided for borrowings | 250,346 | 264,813
Collateral provided for lawsuit | 57 | 42
Deposits for transmission regional support program | 8,626 | 5,921
Deposits for other business purposes | 3,825 | 3,050
Short-term financial instruments |  |
Restricted Deposits [Line Items] |  |
Collateral provided for borrowings | 1,000 | 11,745
Restriction on withdrawal related to 'win-win growth program' for small and medium enterprises | 101,500 | 114,000
Non-Current financial assets at fair value through profit or loss |  |
Restricted Deposits [Line Items] |  |
Decommissioning costs of nuclear power plants | 386,220 | 531,720
Long-term financial instruments |  |
Restricted Deposits [Line Items] |  |
Escrow accounts | 1,603 | 70
Collateral provided for borrowings | 21,745 | 0
Decommissioning costs of nuclear power plants | 497,609 | 324,609
Guarantee deposits for banking accounts at oversea branches | 18 | 333
Funds for developing small and medium enterprises | 0 | 10,000
Other Non-current assets |  |
Restricted Deposits [Line Items] |  |
Deposits for other business purposes | ₩ 4,355 | ₩ 0

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 funds for developing small and medium enterprises. + References No definition available. + Details
Name: | kep_RestrictedFundsForDevelopingSmallAndMediumEnterprises
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: |