XML 172 R159.htm IDEA: XBRL DOCUMENT
v3.25.1

Leases - Additional Information (Detail) - KRW (₩) ₩ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure Of Arrangement Involving Legal Form Of Lease [Abstract] |  |  |
Cash outflow for leases | ₩ 508,230 | ₩ 500,392 | ₩ 464,337
Increase decrease in right of use assets | ₩ 337,779 | ₩ 440,552 |

X
- Definition The cash outflow for leases. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2024-01-01 -Paragraph 53 -Subparagraph g -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2024-en-r&anchor=para_53_g&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_CashOutflowForLeases
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- 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

X
- 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