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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

Name:	kt_ChangeEffectOfUsefulLifeFromMediaContentsAsset
Namespace Prefix:	kt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- 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

X

- References

No definition available.

+ Details

Name:	kt_StatementLineItems
Namespace Prefix:	kt_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration