XML 169 R157.htm IDEA: XBRL DOCUMENT
v3.19.1

Commitments and Contingencies - Additional Information (Detail) ₩ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 KRW (₩) Lawsuits | Dec. 31, 2017 KRW (₩)
Commitments and contingencies [abstract] |  |
Severally liable for reimbursement | ₩ 3,480 |
Number of lawsuits | Lawsuits | 172 |
Litigation settlement claim amount | ₩ 169,246 | ₩ 112,639
Litigation provision | 58,776 |
Collaterally guarantees the debt | ₩ 6,000 |
New town development consortium percentage of ownership interest | 2.50% |
Contract amount not yet recognized as liabilities | ₩ 1,474,009 | ₩ 622,059

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 2018-01-01 -Paragraph 85 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2018-03-01&anchor=para_85_c&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_ExpectedReimbursementOtherProvisions
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 2018-01-01 -Section Example 10 A court case -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2018-03-01&anchor=sect_Example10Acourtcase&doctype=Illustrative%20Examples -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 37 -IssueDate 2018-01-01 -Paragraph 87 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2018-03-01&anchor=para_87&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_LegalProceedingsProvision
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of guarantees or collateral provided by the entity in related party transactions. [Refer: Guarantees [member]; Related parties [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 24 -IssueDate 2018-01-01 -Paragraph 21 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=24&date=2018-03-01&anchor=para_21_h&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_ProvisionOfGuaranteesOrCollateralByEntityRelatedPartyTransactions
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

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 Commitments and contingencies [abstract] + References No definition available. + Details
Name: | kt_CommitmentsAndContingenciesAbstract
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: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Litigation settlements claim amount. + References No definition available. + Details
Name: | kt_LitigationSettlementsClaimAmount
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