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Basis of Preparation - Additional Information (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2021	Dec. 31, 2020
Unbilled Revenue [Member]
Disclosure Of Basis Of Preparation Of Financial Statements [Line Items]
Unbilled revenue recognized	₩ 1,725,444	₩ 1,691,294

X

- Definition

Contract assets from unmetered electricity supply.

+ References

No definition available.

+ Details

Name:	kep_ContractAssetsFromUnmeteredElectricitySupply
Namespace Prefix:	kep_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Disclosure of basis of preparation of financial statements.

+ References

No definition available.

+ Details

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

X

- Details

Name:	kep_BillingStatusTypeAxis=kep_UnbilledRevenueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: