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Accumulated Other Comprehensive Income and Other Components of Equity - Summary of Other Components of Equity (Parenthetical) (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Miscellaneous equity [abstract]
Treasury shares, Amount directly reflected in equity	₩ 101	₩ 14,886

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- References

No definition available.

+ Details

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Namespace Prefix:	ifrs-full_
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- Definition

The value of treasury shares directly reflected in equity.

+ References

No definition available.

+ Details

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