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

X

- 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

X

- Definition

Research and development expense.

+ References

No definition available.

+ Details

Name:	kep_ResearchAndDevelopmentExpenseAbstract
Namespace Prefix:	kep_
Data Type:	xbrli:stringItemType
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Period Type:	duration