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v3.25.1

Share Capital - Summary of Share Capital (Parenthetical) (Detail) - shares | Dec. 31, 2024 | Dec. 31, 2023
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Disclosure of classes of share capital [abstract] |  |
Treasury shares | 60,878,082 | 60,878,082

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- 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 Number of treasury shares retired against retained earnings. + References No definition available. + Details
Name: | kt_NumberOfTreasurySharesRetiredAgainstRetainedEarnings
Namespace Prefix: | kt_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant