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Restricted Deposits - Summary of Restricted Deposits (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Restricted Deposits [Line Items] |  |  |
Total Restricted Deposits |  | ₩ 1,288,589 | ₩ 1,295,758
Cash and Cash Equivalents |  |  |
Restricted Deposits [Line Items] |  |  |
Escrow accounts |  | 0 | 544
Deposits for government project |  | 22,286 | 5,066
Collateral provided for borrowings |  | 264,813 | 117,747
Collateral provided for lawsuit |  | 42 | 42
Deposits for transmission regional support program |  | 5,921 | 5,469
Deposits for Other Business Purposes |  | 3,050 |
Short-term financial instruments |  |  |
Restricted Deposits [Line Items] |  |  |
Collateral provided for borrowings |  | 11,745 |
Restriction on withdrawal related to 'win-win growth program' for small and medium enterprises |  | 114,000 | 109,000
Non-Current financial assets at fair value through profit or loss |  |  |
Restricted Deposits [Line Items] |  |  |
Decommissioning costs of nuclear power plants |  | 531,720 | 577,481
Long-term financial instruments |  |  |
Restricted Deposits [Line Items] |  |  |
Escrow accounts |  | 70 | 76
Collateral provided for borrowings |  | 0 | 11,745
Decommissioning costs of nuclear power plants |  | 324,609 | 258,282
Guarantee deposits for banking accounts at oversea branches |  | 333 | 306
Funds for developing small and medium enterprises | [1] | ₩ 10,000 | ₩ 210,000
[1] | As of December 31, 2020, it consisted of the deposits for small and medium enterprises at the Industrial Bank of Korea (IBK) and others for construction of Bitgaram Energy Valley and support for high potential businesses amounting to ￦200,000 million and the deposits were returned during the year ended December 31, 2021.

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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

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

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- 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

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

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- 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

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- 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

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- 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

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- 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

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- 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

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- 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

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- 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

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- 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

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

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

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

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