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Intangible Assets - Summary of Intangible Assets (Parenthetical) (Detail) - KRW (₩) ₩ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022
Statement [Line Items] |  |
Changed effect of useful life | ₩ 52,179 |
Goodwill not subject to amortization | ₩ 212,910 | ₩ 210,114

X
- Definition Change effect of useful life from media contents asset. + References No definition available. + Details
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Namespace Prefix: | kt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Goodwill not subject to amortization. + References No definition available. + Details
Name: | kt_GoodwillNotSubjectToAmortization
Namespace Prefix: | kt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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