XML 130 R119.htm IDEA: XBRL DOCUMENT
v3.22.1

Property and Equipment - Summary of Changes in Property and Equipment (Detail) - KRW (₩) ₩ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Beginning, net | ₩ 14,206,119 | ₩ 13,785,299 |
Acquisition and capital expenditure | 3,128,093 | 3,151,849 |
Disposal and termination | (140,753) | (78,936) |
Depreciation | (2,596,140) | (2,570,775) |
Impairment | (2,115) | (79,775) | ₩ (43,260)
Transfer in (out) | (83,879) | (44,860) |
Transfer from (to) investment properties | (132,944) | (2,056) |
Changes in scope of consolidation | 111,271 | 818 |
Others | (24,766) | 44,555 |
Ending, net | 14,464,886 | 14,206,119 | 13,785,299
Gross carrying amount [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Beginning, net | 47,586,332 | 45,655,456 |
Ending, net | 48,995,516 | 47,586,332 | 45,655,456
Accumulated depreciation, amortisation and impairment [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Beginning, net | (33,380,213) | (31,870,157) |
Ending, net | (34,530,630) | (33,380,213) | (31,870,157)
Land [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Beginning, net | 1,334,627 | 1,262,181 |
Acquisition and capital expenditure | 60,817 | 25,156 |
Disposal and termination | (45,318) | (1,756) |
Transfer in (out) | 4,608 | 53,238 |
Transfer from (to) investment properties | (59,848) | 6,792 |
Changes in scope of consolidation | 20,911 | 56 |
Others | 0 | (11,040) |
Ending, net | 1,315,797 | 1,334,627 | 1,262,181
Land [member] | Gross carrying amount [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Beginning, net | 1,334,759 | 1,262,313 |
Ending, net | 1,315,929 | 1,334,759 | 1,262,313
Land [member] | Accumulated depreciation, amortisation and impairment [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Beginning, net | (132) | (132) |
Ending, net | (132) | (132) | (132)
Buildings and structures [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Beginning, net | 2,308,022 | 2,162,064 |
Acquisition and capital expenditure | 36,446 | 7,249 |
Disposal and termination | (11,827) | (3,367) |
Depreciation | (145,954) | (135,646) |
Impairment | 0 | (36) |
Transfer in (out) | 415,771 | 283,937 |
Transfer from (to) investment properties | (73,096) | (8,848) |
Changes in scope of consolidation | 6,355 | 494 |
Others | (18,295) | 2,175 |
Ending, net | 2,517,422 | 2,308,022 | 2,162,064
Buildings and structures [member] | Gross carrying amount [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Beginning, net | 4,402,691 | 4,125,229 |
Ending, net | 4,707,250 | 4,402,691 | 4,125,229
Buildings and structures [member] | Accumulated depreciation, amortisation and impairment [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Beginning, net | (2,094,669) | (1,963,165) |
Ending, net | (2,189,828) | (2,094,669) | (1,963,165)
Machinery and equipment1 [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Beginning, net | 9,314,983 | 9,093,251 |
Acquisition and capital expenditure | 28,159 | 112,085 |
Disposal and termination | (76,676) | (69,401) |
Depreciation | (2,368,679) | (2,343,965) |
Impairment | (2,075) | (35,271) |
Transfer in (out) | 2,340,948 | 2,489,138 |
Changes in scope of consolidation | 67,925 | 225 |
Others | 11,986 | 68,921 |
Ending, net | 9,316,571 | 9,314,983 | 9,093,251
Machinery and equipment1 [member] | Gross carrying amount [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Beginning, net | 39,182,265 | 37,654,635 |
Ending, net | 40,270,005 | 39,182,265 | 37,654,635
Machinery and equipment1 [member] | Accumulated depreciation, amortisation and impairment [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Beginning, net | (29,867,282) | (28,561,384) |
Ending, net | (30,953,434) | (29,867,282) | (28,561,384)
Others [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Beginning, net | 205,652 | 267,535 |
Acquisition and capital expenditure | 55,336 | 47,669 |
Disposal and termination | (6,868) | (3,385) |
Depreciation | (81,507) | (91,164) |
Impairment | (40) | (44,468) |
Transfer in (out) | 27,051 | 28,024 |
Changes in scope of consolidation | 15,583 | 43 |
Others | 6,031 | 1,398 |
Ending, net | 221,238 | 205,652 | 267,535
Others [member] | Gross carrying amount [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Beginning, net | 1,619,822 | 1,612,108 |
Ending, net | 1,607,853 | 1,619,822 | 1,612,108
Others [member] | Accumulated depreciation, amortisation and impairment [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Beginning, net | (1,414,170) | (1,344,573) |
Ending, net | (1,386,615) | (1,414,170) | (1,344,573)
Construction-in-progress [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Beginning, net | 1,042,835 | 1,000,268 |
Acquisition and capital expenditure | 2,947,335 | 2,959,690 |
Disposal and termination | (64) | (1,027) |
Impairment | 0 | 0 |
Transfer in (out) | (2,872,257) | (2,899,197) |
Changes in scope of consolidation | 497 |  |
Others | (24,488) | (16,899) |
Ending, net | 1,093,858 | 1,042,835 | 1,000,268
Construction-in-progress [member] | Gross carrying amount [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Beginning, net | 1,046,795 | 1,001,171 |
Ending, net | 1,094,479 | 1,046,795 | 1,001,171
Construction-in-progress [member] | Accumulated depreciation, amortisation and impairment [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Beginning, net | (3,960) | (903) |
Ending, net | ₩ (621) | ₩ (3,960) | ₩ (903)

X
- Definition The amount of additions to property, plant and equipment other than those acquired through business combinations. [Refer: Business combinations [member]; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2021-01-01 -Paragraph 73 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2021-en-r&anchor=para_73_e_i&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipment
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of depreciation of property, plant and equipment. [Refer: Depreciation and amortisation expense; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2021-01-01 -Paragraph 73 -Subparagraph e -Clause vii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2021-en-r&anchor=para_73_e_vii&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2021-01-01 -Paragraph 75 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2021-en-r&anchor=para_75_a&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_DepreciationPropertyPlantAndEquipment
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_DisclosureOfPropertyPlantAndEquipmentLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The decrease in property, plant and equipment resulting from disposals and retirements. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 16 -IssueDate 2021-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2021-en-r&anchor=para_73_e&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_DisposalsAndRetirementsPropertyPlantAndEquipment
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of impairment loss recognised in profit or loss for property, plant and equipment. [Refer: Impairment loss recognised in profit or loss; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2021-01-01 -Paragraph 73 -Subparagraph e -Clause v -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2021-en-r&anchor=para_73_e_v&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 98 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_98_a&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_ImpairmentLossRecognisedInProfitOrLossPropertyPlantAndEquipment
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition The increase (decrease) in property, plant and equipment resulting from changes that the entity does not separately disclose in the same statement or note. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2021-01-01 -Paragraph 73 -Subparagraph e -Clause ix -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2021-en-r&anchor=para_73_e_ix&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_IncreaseDecreaseThroughOtherChangesPropertyPlantAndEquipment
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The increase (decrease) in property, plant and equipment resulting from transfers and changes that the entity does not separately disclose in the same statement or note. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 16 -IssueDate 2021-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2021-en-r&anchor=para_73_e&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_IncreaseDecreaseThroughTransfersAndOtherChangesPropertyPlantAndEquipment
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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 2021-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2021-en-r&anchor=para_73_e&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_IncreaseDecreaseThroughTransfersPropertyPlantAndEquipment
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of tangible assets that: (a) are held for use in the production or supply of goods or services, for rental to others, or for administrative purposes; and (b) are expected to be used during more than one period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2021-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2021-en-r&anchor=para_73_e&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 54 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_54_a&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_PropertyPlantAndEquipment
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Change in scope of consolidation. + References No definition available. + Details
Name: | kt_ChangeInScopeOfConsolidation
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_AccumulatedDepreciationAmortisationAndImpairmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=kt_MachineryAndEquipment1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ifrs-full_OtherPropertyPlantAndEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ifrs-full_ConstructionInProgressMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |