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Trade and Other Receivables - Trade and Other Receivables (Parenthetical) (Details) - Finance lease receivables - KRW (₩) ₩ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Current assets |  |
Trade and Other Receivables [Line Items] |  |
Unearned finance income relating to finance lease payments receivable | ₩ 111,915 | ₩ 105,127
Non-current assets |  |
Trade and Other Receivables [Line Items] |  |
Unearned finance income relating to finance lease payments receivable | ₩ 1,082,712 | ₩ 1,087,559

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- Definition The amount of unearned finance income relating to the finance lease payments receivable. Finance lease is a lease that transfers substantially all the risks and rewards incidental to ownership of an underlying asset. [Refer: Finance income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2021-01-01 -Paragraph 94 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2021-en-r&anchor=para_94&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_UnearnedFinanceIncomeRelatingToFinanceLeasePaymentsReceivable
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Details
Name: | ifrs-full_ClassesOfAssetsAxis=kep_CurrentTradeAndOtherReceivablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | kep_TradeOtherReceivablesAxis=kep_FinanceLeaseReceivablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfAssetsAxis=kep_NoncurrentTradeAndOtherReceivablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |