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Borrowings and Debt Securities - Local Debt Securities and Foreign Debt Securities (Parenthetical) (Details) - Hee mang sunlight Power Co., Ltd [Member] ₩ in Millions	12 Months Ended
	Dec. 31, 2022 KRW (₩)
Debt Instrument [Line Items]
Value of bonds entitled to premature redemption	₩ 1,619
Premature redemption due date	Mar. 31, 2021

X

- Definition

Debt instrument.

+ References

No definition available.

+ Details

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

X

- Definition

Premature redemption due date.

+ References

No definition available.

+ Details

Name:	kep_PrematureRedemptionDueDate
Namespace Prefix:	kep_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Value of bonds entitled to premature redemption.

+ References

No definition available.

+ Details

Name:	kep_ValueOfBondsEntitledToPrematureRedemption
Namespace Prefix:	kep_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	kep_RelatedPartyTransactionsByRelatedPartyAxis=kep_HeeMangSunlightPowerCo.LtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: