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Segment Information - Summary of Segment Information (Parenthetical) (Detail) ₩ in Millions	Dec. 31, 2020 KRW (₩)
ICT [member]
Disclosure of operating segments [line items]
Property and equipment and intangible assets	₩ 13,583,173

X

- 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

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

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- Definition

Total Property and Equipment and Intangible assets.

+ References

No definition available.

+ Details

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

X

- Details

Name:	ifrs-full_SegmentsAxis=kt_IctMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: