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Commitments and Contingencies - Additional Information (Detail) $ in Thousands, ₩ in Millions	12 Months Ended
	Dec. 31, 2023 KRW (₩) EUR (€)	Dec. 31, 2023 USD ($) EUR (€)	Dec. 31, 2022 KRW (₩)
Commitments and Contingencies [Line Items]
Severally liable for reimbursement	₩ 595
Number of lawsuits | €	177	177
Litigation settlement claim amount	₩ 167,834		₩ 80,279
Litigation provision	₩ 29,707
New town development consortium percentage of ownership interest	2.50%	2.50%
Contract amount not yet recognized as liabilities	₩ 489,231		₩ 1,294,823
Additional cumulative investment amount	4,132	$ 30,350
Estimated financial effect of contingent liabilities	₩ 438,312
Percentage of estimated financial effect of contingent liabilities	100.00%
K Defense Co.Ltd [member]
Commitments and Contingencies [Line Items]
Estimated financial effect of contingent liabilities	₩ 302,423
Percentage of estimated financial effect of contingent liabilities	60.00%
Joint operations [member]
Commitments and Contingencies [Line Items]
Estimated financial effect of contingent liabilities	₩ 201,615
Percentage of estimated financial effect of contingent liabilities	40.00%

X

- Definition

The amount of the estimated financial effect of contingent liabilities. [Refer: Contingent liabilities [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 37
-IssueDate 2023-01-01
-Paragraph 86
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2023-en-r&anchor=para_86_a&doctype=Standard
-URIDate 2023-03-23

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The amount expected to be reimbursed by another party on expenditures to settle other provisions. [Refer: Other provisions]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 37
-IssueDate 2023-01-01
-Paragraph 85
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2023-en-r&anchor=para_85_c&doctype=Standard
-URIDate 2023-03-23

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of provision for legal proceedings. [Refer: Other provisions]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 37
-IssueDate 2023-01-01
-Section Example 10 A court case
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2023-en-r&doctype=Illustrative%20Examples&dita_xref=IAS37_IE_C_ex10_TI
-URIDate 2023-03-23

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 37
-IssueDate 2023-01-01
-Paragraph 87
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2023-en-r&anchor=para_87&doctype=Standard
-URIDate 2023-03-23

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Acquisition contract agreement not yet recognized as liabilities.

+ References

No definition available.

+ Details

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

X

- Definition

Additional cumulative investment amount.

+ References

No definition available.

+ Details

Name:	kt_AdditionalCumulativeInvestmentAmount
Namespace Prefix:	kt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Commitments and contingencies.

+ References

No definition available.

+ Details

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

X

- Definition

Guarantee interest percentage.

+ References

No definition available.

+ Details

Name:	kt_GuaranteeInterestPercentage
Namespace Prefix:	kt_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Litigation settlements claim amount.

+ References

No definition available.

+ Details

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

X

- Definition

Number of law suits faced.

+ References

No definition available.

+ Details

Name:	kt_NumberOfLawsuitsFaced
Namespace Prefix:	kt_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of estimated financial effect of contingent liabilities.

+ References

No definition available.

+ Details

Name:	kt_PercentageOfEstimatedFinancialEffectOfContingentLiabilities
Namespace Prefix:	kt_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=kt_KDefenseCo.ltdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_JointOperationsAxis=ifrs-full_JointOperationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: