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Lease - Summary of Changes in Allowance For Doubtful Accounts of Finance Lease Receivables (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Changes in the allowance for doubtful accounts of finance lease receivables [Abstract] |  |
Beginning balance | ₩ 990 | ₩ 862
Bad debt expense | 0 | 128
Reversal of allowance for doubtful accounts | (222) | 0
Ending balance | ₩ 768 | ₩ 990

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- Definition Allowance for doubtful accounts finance lease receivables. + References No definition available. + Details
Name: | kep_AllowanceForDoubtfulAccountsFinanceLeaseReceivables
Namespace Prefix: | kep_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Allowance for doubtful accounts other financial assets bad debt expense. + References No definition available. + Details
Name: | kep_AllowanceForDoubtfulAccountsFinanceLeaseReceivablesBadDebtExpense
Namespace Prefix: | kep_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Reversal of allowance for doubtful accounts. + References No definition available. + Details
Name: | kep_AllowanceForDoubtfulAccountsFinanceLeaseReceivablesReversalOfAllowanceForDoubtful
Namespace Prefix: | kep_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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