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Revenue from Contracts with Customers and Relevant Contract Assets and Liabilities - Additional Information (Detail) ₩ in Millions | 12 Months Ended
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Dec. 31, 2018 KRW (₩)
Disclosure of disaggregation of revenue from contracts with customers [abstract] |
Operating expenses | ₩ 1,397,318

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- References No definition available. + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Operating expenses related to contract cost assets + References No definition available. + Details
Name: | kt_OperatingExpensesRelatedToContractCostAssets
Namespace Prefix: | kt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration