XML 234 R221.htm IDEA: XBRL DOCUMENT
v3.25.1

Fair Value - Summary of Fair Value Non of Financial Instruments (Detail) - KRW (₩) ₩ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Disclosure of detailed information about financial instruments [line items] |  |
Non financial assets | ₩ 10,154,644 | ₩ 8,171,407
Non financial liabilities | 10,555,633 | 10,140,198
Level 1 [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non financial assets | 1,322,740 | 1,244,847
Level 2 [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non financial assets | 747,357 | 437,533
Non financial liabilities | 10,423,622 | 10,005,637
Level 3 [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non financial assets | 8,084,547 | 6,489,027
Non financial liabilities | 132,011 | 134,561
Financial assets at fair value through other comprehensive income [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non financial assets | 114,774 | 116,198
Financial assets at fair value through other comprehensive income [member] | Level 1 [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non financial assets | 0 | 0
Financial assets at fair value through other comprehensive income [member] | Level 2 [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non financial assets | 114,774 | 116,198
Financial assets at fair value through other comprehensive income [member] | Level 3 [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non financial assets | 0 | 0
Financial assets at fair value through profit or loss [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non financial assets | 1,029,926 | 939,661
Financial assets at fair value through profit or loss [member] | Level 1 [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non financial assets | 5,620 | 13,911
Financial assets at fair value through profit or loss [member] | Level 2 [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non financial assets | 181,694 | 156,918
Financial assets at fair value through profit or loss [member] | Level 3 [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non financial assets | 842,612 | 768,832
Other financial assets at fair value through other comprehensive income [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non financial assets | 1,665,368 | 1,680,168
Other financial assets at fair value through other comprehensive income [member] | Level 1 [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non financial assets | 1,317,120 | 1,230,936
Other financial assets at fair value through other comprehensive income [member] | Level 2 [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non financial assets | 5,418 | 5,206
Other financial assets at fair value through other comprehensive income [member] | Level 3 [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non financial assets | 342,830 | 444,026
Derivative financial assets for hedging [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non financial assets | 445,471 | 159,211
Derivative financial assets for hedging [member] | Level 2 [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non financial assets | 445,471 | 159,211
Derivative financial assets for hedging [member] | Level 3 [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non financial assets | 0 | 0
Investment Properties [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non financial assets | 6,899,105 | 5,276,169
Investment Properties [member] | Level 3 [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non financial assets | 6,899,105 | 5,276,169
Borrowing [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non financial liabilities | 10,423,619 | 9,979,545
Borrowing [Member] | Level 2 [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non financial liabilities | 10,423,619 | 9,979,545
Other financial liabilities at fair value through profit or loss [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non financial liabilities | 132,011 | 136,106
Other financial liabilities at fair value through profit or loss [member] | Level 2 [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non financial liabilities | 0 | 1,545
Other financial liabilities at fair value through profit or loss [member] | Level 3 [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non financial liabilities | 132,011 | 134,561
Derivative financial liabilities for hedging purpose [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non financial liabilities | 3 | 24,547
Derivative financial liabilities for hedging purpose [member] | Level 2 [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non financial liabilities | ₩ 3 | ₩ 24,547

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

X
- Definition The amount of non-current financial assets. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 25 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_25&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_NoncurrentFinancialAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of non-current financial liabilities. [Refer: Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 25 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_25&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_NoncurrentFinancialLiabilities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | ifrs-full_LevelsOfFairValueHierarchyAxis=ifrs-full_Level1OfFairValueHierarchyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_LevelsOfFairValueHierarchyAxis=ifrs-full_Level2OfFairValueHierarchyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_LevelsOfFairValueHierarchyAxis=ifrs-full_Level3OfFairValueHierarchyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=kt_FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=kt_OtherFinancialAssetsAtFairValueThroughProfitOrLossMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=kt_OtherFinancialAssetsAtFairValueThroughOtherComprehensiveIncomeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=kt_OtherDerivativeFinancialAssetsForHedgingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=kt_InvestmentPropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=kt_BorrowingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=kt_OtherFinancialLiabilitiesAtFairValueThroughProfitOrLossMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=kt_OtherDerivativeFinancialLiabilitiesForHedgingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |