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Share-based Payments - Summary of Details of Share-based Payments (Detail) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
15th grant |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Fair value per option |  | ₩ 32,397
Total compensation costs |  | 5,005
Employee wage negotiation [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Fair value per option |  | 30,950
Total compensation costs |  | ₩ 40,083
16th grant |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Fair value per option | ₩ 36,941 |
Total compensation costs | ₩ 6,222 |

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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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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The weighted average fair value of share options granted during the period at the measurement date. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2022-03-24 -Paragraph 47 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2022-en-r&anchor=para_47_a&doctype=Standard -URIDate 2022-03-24 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Total compensation costs. + References No definition available. + Details
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Namespace Prefix: | kt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=kt_FifteenthGrantMember
Namespace Prefix: |
Data Type: | na
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Period Type: |

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- Details
Name: | ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=kt_EmployeeWageNegotiationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |