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Financial Risk Management - Summary of Impairment of Trade Receivable (Detail) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Trade receivables [member] |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Impairment loss Bad debt expenses | ₩ 95,060 | ₩ 69,972

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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
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Impairment Loss Bad Debt Expenses. + References No definition available. + Details
Name: | kt_ImpairmentLossBadDebtExpenses
Namespace Prefix: | kt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | ifrs-full_ClassesOfFinancialAssetsAxis=ifrs-full_TradeReceivablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |