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Changes in Accounting Policies - Summary of quantitative information about lease liabilities (Detail) - KRW (₩) ₩ in Millions | Dec. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018
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Disclosure Of Quantitative Information About Lease Liabilities [Abstract] |  |  |
Operating lease commitments | ₩ 675,658 |  |
Discounted using the lessee's incremental borrowing rate of at the date of initial application | 643,375 |  |
Add: finance lease liabilities recognized | 163,858 |  |
Lease liability recognized | 807,233 | ₩ 807,233 | ₩ 163,858
Current lease liabilities | 336,530 | 336,530 |
Non-current lease liabilities | 470,703 | 470,703 |
Lease liabilities | ₩ 807,233 | ₩ 807,233 | ₩ 163,858

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- Definition The amount of current lease liabilities. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_47_b&doctype=Standard -URIDate 2019-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_47_b&doctype=Standard -URIDate 2019-03-27 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of non-current lease liabilities. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_47_b&doctype=Standard -URIDate 2019-03-27 + Details
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Balance Type: | credit
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- Definition Disclosure Of Quantitative Information About Lease Liabilities [Abstract]. + References No definition available. + Details
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- Definition Discounted operating lease commitments. + References No definition available. + Details
Name: | kt_DiscountedOperatingLeaseCommitments
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Finance lease liability. + References No definition available. + Details
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Namespace Prefix: | kt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Operating Lease Commitments. + References No definition available. + Details
Name: | kt_OperatingLeaseCommitments
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Data Type: | xbrli:monetaryItemType
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