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Details of share premium (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Share premium [Abstract]
Share premium	₩ 843,758	₩ 843,758

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- Definition

The amount received or receivable from the issuance of the entity's shares in excess of nominal value.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 78
-Subparagraph e
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_78_e&doctype=Standard
-URIDate 2020-01-01

+ Details

Name:	ifrs-full_SharePremium
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_SharePremiumAbstract
Namespace Prefix:	kep_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration