XML 124 R177.htm IDEA: XBRL DOCUMENT
v3.20.1

Revenue from Contracts with Customers and Relevant Contract Assets and Liabilities - Detail of Revenue Arising from Carried-Forward Contract Liabilities (Detail) - KRW (₩) ₩ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Disclosure of disaggregation of revenue from contracts with customers [abstract] |  |
Allocation of the transaction price | ₩ 258,548 | ₩ 183,905
Deferred revenue of joining/installment fee | 44,032 | 39,975
Others |  | 1,536
Total | ₩ 302,580 | ₩ 225,416

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 The amount of the transaction price allocated to the performance obligations that are unsatisfied (or partially unsatisfied) as of the end of the reporting period. The transaction price is the amount of consideration to which an entity expects to be entitled in exchange for transferring promised goods or services to a customer, excluding amounts collected on behalf of third parties (for example, some sales taxes). [Refer: Performance obligations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2019-01-01 -Paragraph 120 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2019-en-r&anchor=para_120_a&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_TransactionPriceAllocatedToRemainingPerformanceObligations
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Deferred revenue related to contract liabilities. + References No definition available. + Details
Name: | kt_DeferredRevenueRelatedToContractLiabilities
Namespace Prefix: | kt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Revenue recognized related to contract liabilities. + References No definition available. + Details
Name: | kt_RevenueRecognizedRelatedToContractLiabilities
Namespace Prefix: | kt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Revenue recognized related to contract liabilities others. + References No definition available. + Details
Name: | kt_RevenueRecognizedRelatedToContractLiabilitiesOthers
Namespace Prefix: | kt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration