XML 40 R176.htm IDEA: XBRL DOCUMENT
v3.20.1

Revenue from Contracts with Customers and Relevant Contract Assets and Liabilities - Additional Information (Detail) - KRW (₩) ₩ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Disclosure of disaggregation of revenue from contracts with customers [abstract] |  |
Operating expenses | ₩ 1,681,039 | ₩ 1,397,318

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

X
- 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