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Trade and Other Receivables - Summary of Other Receivables (Parenthetical) (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017
BC Card Co., Ltd. [member]
Disclosure of financial assets [line items]
Settlement receivable included in other receivables	₩ 1,895,575	₩ 2,262,829

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain 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

Settlement receivable included in other eceivables.

+ References

No definition available.

+ Details

Name:	kt_SettlementReceivableIncludedInOtherReceivables
Namespace Prefix:	kt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_BCCardCoLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: