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Intangible Assets other than Goodwill - Summary of Recognized Research and Development Expenses (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Research And Development Expense [Abstract] |  |  |
Research and development expense | ₩ 689,397 | ₩ 700,642 | ₩ 735,715

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- Definition The amount of expenditure directly attributable to research or development activities, recognised in profit or loss. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2021-01-01 -Paragraph 126 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2021-en-r&anchor=para_126&doctype=Standard -URIDate 2021-03-24 + Details
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Balance Type: | debit
Period Type: | duration

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- Definition Research and development expense. + References No definition available. + Details
Name: | kep_ResearchAndDevelopmentExpenseAbstract
Namespace Prefix: | kep_
Data Type: | xbrli:stringItemType
Balance Type: | na
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