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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 (₩)
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LOTTE Engineering Construction [Member] |
Disclosure Of Real Estate Collateral Trust And Beneficiary Certificates Of The Group [Line Items] |
Construction contract amount | ₩ 614,101

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- Definition Construction contract amount. + References No definition available. + Details
Name: | kt_ConstructionContractAmount
Namespace Prefix: | kt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- 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: |