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Commitments and Contingencies - Additional Information (Detail) $ in Thousands, ₩ in Millions	12 Months Ended
	Dec. 31, 2022 KRW (₩) EUR (€)	Dec. 31, 2022 USD ($) EUR (€)	Dec. 31, 2021 KRW (₩)
Commitments and contingencies [abstract]
Severally liable for reimbursement	₩ 653
Number of lawsuits | €	189	189
Litigation settlement claim amount	₩ 80,279		₩ 101,597
Litigation provision	₩ 36,329
New town development consortium percentage of ownership interest	2.50%	2.50%
Contract amount not yet recognized as liabilities	₩ 1,294,823		₩ 1,336,758
Additional cumulative investment amount	₩ 5,473	$ 34,050

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 2022-03-24
-Paragraph 85
-Subparagraph c
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-URIDate 2022-03-24

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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 2022-03-24
-Section Example 10 A court case
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2022-en-r&doctype=Illustrative%20Examples&dita_xref=IAS37_IE_C_ex10__IAS37_IE_C_ex10_TI
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Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
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-IssueDate 2022-03-24
-Paragraph 87
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2022-en-r&anchor=para_87&doctype=Standard
-URIDate 2022-03-24

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Balance Type:	credit
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X

- Definition

Acquisition contract agreement not yet recognized as liabilities.

+ References

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

Additional cumulative investment amount.

+ References

No definition available.

+ Details

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Balance Type:	credit
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- Definition

Commitments and contingencies [abstract]

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- Definition

Guarantee interest percentage.

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No definition available.

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

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- 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.

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