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v3.23.1

Property and Equipment - Summary of the Details of Property and Equipment Provided (Detail) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Disclosure of detailed information about property, plant and equipment [line items] |  |
Related amount | ₩ 10,006,685 | ₩ 8,437,703
Land and buildings [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Carrying amount | 11,353 | 11,320
Secured amount | ₩ 15,774 | ₩ 15,412
Related line item | Borrowings | Borrowings
Related amount | ₩ 3,228 | ₩ 3,272
Secured party | Industrial Bank of Korea, Korea Development Bank | Industrial Bank of Korea, Korea Development Bank

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- Definition The amount of outstanding funds that the entity is obligated to repay. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_55&doctype=Standard -URIDate 2022-03-24 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of property, plant and equipment pledged as security for liabilities. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2022-03-24 -Paragraph 74 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2022-en-r&anchor=para_74_a&doctype=Standard -URIDate 2022-03-24 + Details
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Balance Type: | debit
Period Type: | instant

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- Definition Related amount description in property plant and equipment + References No definition available. + Details
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- Definition Secured amount in property plan and equipment. + References No definition available. + Details
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Namespace Prefix: | kt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Secured party. + References No definition available. + Details
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Namespace Prefix: | kt_
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Balance Type: | na
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |