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Commitments and Contingencies - Summary of the issuance of real estate collateral trust and beneficiary certificates of the Group (Parenthetical) (Detail) ₩ in Millions	Dec. 31, 2022 KRW (₩)
LOTTE Engineering Construction [Member]
Disclosure Of Real Estate Collateral Trust And Beneficiary Certificates Of The Group [Line Items]
Construction contract amount	₩ 614,101

X

- Definition

Construction contract amount.

+ References

No definition available.

+ Details

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Namespace Prefix:	kt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Disclosure of real estate collateral trust and beneficiary certificates of the Group [Lineitems].

+ References

No definition available.

+ Details

Name:	kt_DisclosureOfRealEstateCollateralTrustAndBeneficiaryCertificatesOfTheGroupLineItems
Namespace Prefix:	kt_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	kt_TrustCollateralBeneficiaryAxis=kt_LotteEngineeringConstructionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: