XML 131 R118.htm IDEA: XBRL DOCUMENT
v3.25.1

Investment Properties - Summary of Investment Properties (Detail) - KRW (₩) ₩ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Disclosure of detailed information about investment property [line items] |  |
Beginning balance | ₩ 2,198,135 | ₩ 1,933,358
Acquisition | 244,922 | 210,808
Disposal | (33,976) | (17,490)
Depreciation | (51,581) | (52,869)
Transfer from property and equipment | (47,030) | 126,250
Transfer and others | (10,854) | (1,922)
Ending balance | 2,299,616 | 2,198,135
Gross carrying amount [member] |  |
Disclosure of detailed information about investment property [line items] |  |
Beginning balance | 2,922,705 | 2,596,204
Ending balance | 3,036,828 | 2,922,705
Accumulated depreciation and amortisation [member] |  |
Disclosure of detailed information about investment property [line items] |  |
Beginning balance | (724,570) | (662,846)
Ending balance | (737,212) | (724,570)
Land [member] |  |
Disclosure of detailed information about investment property [line items] |  |
Beginning balance | 909,351 | 879,792
Acquisition | 19,184 | 0
Disposal | (1,586) | (8,167)
Transfer from property and equipment | (24,429) | 37,725
Transfer and others | (5,939) | 1
Ending balance | 896,581 | 909,351
Land [member] | Gross carrying amount [member] |  |
Disclosure of detailed information about investment property [line items] |  |
Beginning balance | 910,919 | 881,360
Ending balance | 898,149 | 910,919
Land [member] | Accumulated depreciation and amortisation [member] |  |
Disclosure of detailed information about investment property [line items] |  |
Beginning balance | (1,568) | (1,568)
Ending balance | (1,568) | (1,568)
Buildings [member] |  |
Disclosure of detailed information about investment property [line items] |  |
Beginning balance | 1,027,675 | 916,458
Acquisition | 7,035 | 57,529
Disposal | (32,390) | (9,323)
Depreciation | (51,581) | (52,869)
Transfer from property and equipment | (21,442) | 88,336
Transfer and others | 856 | 27,544
Ending balance | 930,153 | 1,027,675
Buildings [member] | Gross carrying amount [member] |  |
Disclosure of detailed information about investment property [line items] |  |
Beginning balance | 1,750,677 | 1,577,736
Ending balance | 1,665,797 | 1,750,677
Buildings [member] | Accumulated depreciation and amortisation [member] |  |
Disclosure of detailed information about investment property [line items] |  |
Beginning balance | (723,002) | (661,278)
Ending balance | (735,644) | (723,002)
Investment property, construction-in-progress [Member] |  |
Disclosure of detailed information about investment property [line items] |  |
Beginning balance | 261,109 | 137,108
Acquisition | 218,703 | 153,279
Disposal | 0 | 0
Transfer from property and equipment | (1,159) | 189
Transfer and others | (5,771) | (29,467)
Ending balance | 472,882 | 261,109
Investment property, construction-in-progress [Member] | Gross carrying amount [member] |  |
Disclosure of detailed information about investment property [line items] |  |
Beginning balance | 261,109 | 137,108
Ending balance | ₩ 472,882 | ₩ 261,109

X
- Definition The amount of depreciation recognised on investment property. [Refer: Depreciation and amortisation expense; Investment property] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2024-01-01 -Paragraph 76 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=40&code=ifrs-tx-2024-en-r&anchor=para_76&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2024-01-01 -Paragraph 79 -Subparagraph d -Clause iv -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=40&code=ifrs-tx-2024-en-r&anchor=para_79_d_iv&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_DepreciationInvestmentProperty
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition The decrease in investment property resulting from disposals. [Refer: Investment property] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2024-01-01 -Paragraph 76 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=40&code=ifrs-tx-2024-en-r&anchor=para_76_c&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2024-01-01 -Paragraph 79 -Subparagraph d -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=40&code=ifrs-tx-2024-en-r&anchor=para_79_d_iii&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_DisposalsInvestmentProperty
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The increase (decrease) in property, plant and equipment resulting from transfers. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 16 -IssueDate 2024-01-01 -Paragraph 73 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2024-en-r&anchor=para_73_e&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_IncreaseDecreaseThroughTransfersPropertyPlantAndEquipment
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of property (land or a building - or part of a building - or both) held (by the owner or by the lessee as a right-of-use asset) to earn rentals or for capital appreciation or both, rather than for: (a) use in the production or supply of goods or services or for administrative purposes; or (b) sale in the ordinary course of business. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2024-01-01 -Paragraph 76 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=40&code=ifrs-tx-2024-en-r&anchor=para_76&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2024-01-01 -Paragraph 79 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=40&code=ifrs-tx-2024-en-r&anchor=para_79_d&doctype=Standard -URIDate 2024-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 54 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_54_b&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_InvestmentProperty
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The cash outflow for the purchase of investment property. [Refer: Investment property] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 16 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_16&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_PurchaseOfInvestmentProperty
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Transfer from investment property under construction or development, investment property and other. + References No definition available. + Details
Name: | kt_TransferFromInvestmentPropertyUnderConstructionOrDevelopmentInvestmentPropertyAndOther
Namespace Prefix: | kt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis=ifrs-full_GrossCarryingAmountMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis=ifrs-full_AccumulatedDepreciationAndAmortisationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfInvestmentPropertyAxis=ifrs-full_LandMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfInvestmentPropertyAxis=ifrs-full_BuildingsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfInvestmentPropertyAxis=ifrs-full_InvestmentPropertyUnderConstructionOrDevelopmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |