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Related Party Transactions - Additional Information (Detail) - KRW (₩) ₩ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Kiamco Data Center Blind Fund [Member] |  |
Disclosure of transactions between related parties [line items] |  |
Investment in related party | ₩ 99,633 |
K Bank Inc. [Member] |  |
Disclosure of transactions between related parties [line items] |  |
Credit card contract threshold limit | ₩ 1,447 | ₩ 1,050

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Credit card contract threshold limit. + References No definition available. + Details
Name: | kt_CreditCardContractThresholdLimit
Namespace Prefix: | kt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Investment in related party. + References No definition available. + Details
Name: | kt_InvestmentInRelatedParty
Namespace Prefix: | kt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=kt_KiamcoDataCenterBlindFundMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=kt_KBankInc.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |