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The fair value of investment property (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Disclosure - The fair value of investment property [Line Items]
Fair value of Investment property	₩ 344,598	₩ 240,088
Carrying amount of Investment property	225,195	158,580
Land
Disclosure - The fair value of investment property [Line Items]
Fair value of Investment property	300,001	202,042
Carrying amount of Investment property	200,391	129,897
Buildings
Disclosure - The fair value of investment property [Line Items]
Fair value of Investment property	44,597	38,046
Carrying amount of Investment property	₩ 24,804	₩ 28,683

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- Definition

The amount of property (land or a building - or part of a building - or both) held (by the owner or by the lessee as a right-of-use asset) to earn rentals or for capital appreciation or both, rather than for: (a) use in the production or supply of goods or services or for administrative purposes; or (b) sale in the ordinary course of business.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 40
-IssueDate 2020-01-01
-Paragraph 76
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=40&code=ifrs-tx-2020-en-r&anchor=para_76&doctype=Standard
-URIDate 2020-01-01

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 40
-IssueDate 2020-01-01
-Paragraph 79
-Subparagraph d
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=40&code=ifrs-tx-2020-en-r&anchor=para_79_d&doctype=Standard
-URIDate 2020-01-01

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 54
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_b&doctype=Standard
-URIDate 2020-01-01

+ Details

Name:	ifrs-full_InvestmentProperty
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

Name:	kep_FairValueOfInvestmentProperty
Namespace Prefix:	kep_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

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

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- Details

Name:	ifrs-full_TypesOfInvestmentPropertyAxis=kep_InvestmentPropertyLandMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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- Details

Name:	ifrs-full_TypesOfInvestmentPropertyAxis=kep_InvestmentPropertyBuildingsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: