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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
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

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
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X

- 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:
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Balance Type:
Period Type: