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Assets Held-for-Sale (Parenthetical) (Details) ₩ in Millions	Apr. 13, 2022 KRW (₩)
Non-current assets held for sale
Assets Held for Sale [Line Items]
Long term advance received	₩ 52,666

X

- Definition

Assets held for sale.

+ References

No definition available.

+ Details

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

X

- Definition

Long term advance received.

+ References

No definition available.

+ Details

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

X

- Details

Name:	ifrs-full_AssetsAndLiabilitiesClassifiedAsHeldForSaleAxis=ifrs-full_NoncurrentAssetsHeldForSaleMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: