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Trade and Other Payables - Summary of Other Payables (Parenthetical) (Detail) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Trade and other payables [abstract] |  |
Credit Sale Liabilities Settlement Payable | ₩ 1,612,495 | ₩ 2,314,077

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- References No definition available. + Details
Name: | ifrs-full_TradeAndOtherPayablesAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Credit sale liabilities settlement payable. + References No definition available. + Details
Name: | kt_CreditSaleLiabilitiesSettlementPayable
Namespace Prefix: | kt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration