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Commitments for Expenditure - Additional Information (Details)	12 Months Ended
	Dec. 31, 2022 t
Disclosure of Commitments for Expenditure [Line Items]
Contracted quantity of uranium	1,418

X

- Definition

Contracted quantity of uranium.

+ References

No definition available.

+ Details

Name:	kep_ContractedQuantityOfUranium
Namespace Prefix:	kep_
Data Type:	dtr-types:massItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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