XML 202 R189.htm IDEA: XBRL DOCUMENT
v3.24.1.u1

Deferred Income Tax and Income Tax Expense - Summary of expected period of expiry for unused tax losses not recognized in deferred tax assets (Detail) - KRW (₩) ₩ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax losses for which no deferred tax asset recognised | ₩ 203,200 | ₩ 103,326
2023 [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax losses for which no deferred tax asset recognised | 4,484 | 72,512
2024 [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax losses for which no deferred tax asset recognised | 2,836 | 5,011
2025 [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax losses for which no deferred tax asset recognised | 2,086 | 3,701
2026 [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax losses for which no deferred tax asset recognised | 4,541 | 2,112
2027 [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax losses for which no deferred tax asset recognised | 2,473 | 2,534
2028 [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax losses for which no deferred tax asset recognised | 6,533 | 396
2029 [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax losses for which no deferred tax asset recognised | 743 | 617
2030 [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax losses for which no deferred tax asset recognised | 713 | 2,198
2031 [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax losses for which no deferred tax asset recognised | 756 | 1,360
2032 [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax losses for which no deferred tax asset recognised | 0 | 7,450
After 2033 [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax losses for which no deferred tax asset recognised | ₩ 178,035 | ₩ 5,435

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

X
- Definition The amount of unused tax losses for which no deferred tax asset is recognised in the statement of financial position. [Refer: Unused tax losses [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2023-01-01 -Paragraph 81 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2023-en-r&anchor=para_81_e&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_UnusedTaxLossesForWhichNoDeferredTaxAssetRecognised
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | kt_TaxExpirationPeriodAxis=kt_TaxPeriodTwoThousandAndTwentyThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | kt_TaxExpirationPeriodAxis=kt_TaxPeriodTwoThousandAndTwentyFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | kt_TaxExpirationPeriodAxis=kt_TaxPeriodTwoThousandAndTwentyFiveMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | kt_TaxExpirationPeriodAxis=kt_TaxPeriodTwoThousandAndTwentySixMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | kt_TaxExpirationPeriodAxis=kt_TaxPeriodTwoThousandAndTwentySevenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | kt_TaxExpirationPeriodAxis=kt_TaxPeriodTwoThousandAndTwentyEightMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | kt_TaxExpirationPeriodAxis=kt_TaxPeriodTwoThousandAndTwentyNineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | kt_TaxExpirationPeriodAxis=kt_TaxPeriodTwoThousandAndThirtyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | kt_TaxExpirationPeriodAxis=kt_TaxPeriodTwoThousandAndThirtyOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | kt_TaxExpirationPeriodAxis=kt_TaxPeriodTwoThousandAndThirtyTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | kt_TaxExpirationPeriodAxis=kt_AfterTaxPeriodTwoThousandAndThirtyThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |