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Employment benefit obligations (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Employment Benefits [Abstract] |  |
Net defined benefit asset | ₩ (7,231) | ₩ (1,047)
Net defined benefit obligations | 1,907,013 | 1,925,134
Other long-term employee benefit obligations | 3,847 | 4,720
Employee benefits liabilities, net | ₩ 1,903,629 | ₩ 1,928,807

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- Definition The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 140 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_140_a&doctype=Standard -URIDate 2020-01-01 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition The amount of non-current net defined benefit asset. [Refer: Net defined benefit asset] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard -URIDate 2020-01-01 + Details
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Namespace Prefix: | ifrs-full_
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Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | kep_
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- References No definition available. + Details
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- References No definition available. + Details
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Namespace Prefix: | kep_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant