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Lease - Summary of Changes in Lease Liabilities (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021
Disclosure - Changes in lease liabilities [Abstract]
Beginning balance		₩ 4,410,503	₩ 4,621,096
Increase		109,019	73,090
Decrease		(654,236)	(665,687)
Interest expenses		91,590	93,651
Others	[1]	206,267	288,353
Ending balance		₩ 4,163,143	₩ 4,410,503
[1] Including translation effect of foreign currency lease liabilities and others.

X

- Definition

The amount of interest expense on lease liabilities. [Refer: Lease liabilities]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2022-03-24
-Paragraph 53
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2022-en-r&anchor=para_53_b&doctype=Standard
-URIDate 2022-03-24

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2022-03-24
-Paragraph 47
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2022-en-r&anchor=para_47_b&doctype=Standard
-URIDate 2022-03-24

+ Details

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

X

- Definition

Decrease through leases liabilities except interest expense on lease liabilities.

+ References

No definition available.

+ Details

Name:	kep_DecreaseThroughLeasesLiabilitiesExceptInterestExpenseOnLeaseLiabilities
Namespace Prefix:	kep_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	kep_DisclosureOfChangesInLeaseLiabilitiesAbstract
Namespace Prefix:	kep_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Increase decrease through effect of other changes lease liabilities.

+ References

No definition available.

+ Details

Name:	kep_IncreaseDecreaseThroughEffectOfOtherChangesLeaseLiabilities
Namespace Prefix:	kep_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Increase leases liabilities.

+ References

No definition available.

+ Details

Name:	kep_IncreaseLeasesLiabilities
Namespace Prefix:	kep_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration