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Related Party Transactions - Additional Information (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2023	Dec. 31, 2022
Kiamco Data Center Blind Fund [Member]
Disclosure of transactions between related parties [line items]
Investment in related party	₩ 107,774
K Bank Inc. [Member]
Disclosure of transactions between related parties [line items]
Credit card contract threshold limit	₩ 1,050	₩ 1,000

X

- Definition

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

X

- Definition

Credit card contract threshold limit.

+ References

No definition available.

+ Details

Name:	kt_CreditCardContractThresholdLimit
Namespace Prefix:	kt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Investment in related party.

+ References

No definition available.

+ Details

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

X

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=kt_KiamcoDataCenterBlindFundMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=kt_KBankInc.Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: