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Restricted Deposits - Summary of Restricted Deposits (Parentheticals) (Details) ₩ in Millions	12 Months Ended
	Dec. 31, 2021 KRW (₩)
Restricted Deposits [Abstract]
Restricted Funds For Developing Small And Medium Enterprises Returned During Period	₩ 200,000

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- References

No definition available.

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

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- Definition

Restricted funds for developing small and medium enterprises returned during period.

+ References

No definition available.

+ Details

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