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Cashflows From Disposaled subsidiaries (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of Cashflows From Disposaled subsidiaries [Abstract]
Consideration received in cash	₩ 389	₩ 4	₩ 160
Less: cash and cash equivalents held by disposed subsidiaries	(1,656)	(97)	(175)
Net cash flow	₩ (1,267)	₩ (93)	₩ (15)

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- Definition

The aggregate cash flows arising from losing control of subsidiaries or other businesses, classified as investing activities. [Refer: Subsidiaries [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 7
-IssueDate 2020-01-01
-Paragraph 39
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2020-en-r&anchor=para_39&doctype=Standard
-URIDate 2020-01-01

+ Details

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Period Type:	duration

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- References

No definition available.

+ Details

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Namespace Prefix:	kep_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

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- References

No definition available.

+ Details

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Balance Type:	credit
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