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Leases - Additional Information (Detail) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure Of Arrangement Involving Legal Form Of Lease [Abstract] |  |  |
Cash outflow for leases | ₩ 500,392 | ₩ 464,337 | ₩ 468,360
Increase decrease in right of use assets | ₩ 440,552 | ₩ 405,453 |

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- Definition The cash outflow for leases. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2023-01-01 -Paragraph 53 -Subparagraph g -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2023-en-r&anchor=para_53_g&doctype=Standard -URIDate 2023-03-23 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Disclosure Of arrangement involving legal form of lease. + References No definition available. + Details
Name: | kt_DisclosureOfArrangementInvolvingLegalFormOfLeaseAbstract
Namespace Prefix: | kt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Increase Decrease In Right Of Use Assets + References No definition available. + Details
Name: | kt_IncreaseDecreaseInRightOfUseAssets
Namespace Prefix: | kt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration