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Business Combination - Schedule of Fair Value of Assets and Liabilities Recognized as a Result of Acquisition at Acquisition Date (Detail) ₩ in Millions | Dec. 31, 2021 KRW (₩)
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HCN Co.,Ltd [Member] |
Disclosure of detailed information about business combination [Line Items] |
Fair value of identifiable assets | ₩ 347,971
Cash and cash equivalents | 57,322
Trade and other receivables | 34,820
Other financial assets | 8,847
Finance lease receivables | 4,119
Property and equipment | 90,895
Investment properties | 7,178
Right-of-use assets | 2,601
Intangible assets | 1,819
Customer relationship (Intangible assets) | 125,893
Long-term finance lease receivables | 3,108
Other non-current assets | 6,644
Investments in associates and joint ventures | 2,760
Other non-current financial assets | 1,965
Fair value of identifiable liabilities | 85,560
Trade and other payables | 32,075
Lease liabilities | 2,620
Current provisions | 345
Current income tax liabilities | 2,401
Other current liabilities | 2,940
Net defined benefit liabilities | 4,535
Deferred income tax liabilities | 40,376
Other non-current liabilities | 268
Fair value of identifiable net assets | 262,411
Epsilon Global Communications Pte. Ltd [Member] |
Disclosure of detailed information about business combination [Line Items] |
Fair value of identifiable assets | 92,813
Cash and cash equivalents | 7,470
Trade and other receivables | 11,533
Property and equipment | 21,457
Right-of-use assets | 34,254
Intangible assets | 3,311
Customer relationship (Intangible assets) | 12,964
Deferred income tax assets | 1,824
Fair value of identifiable liabilities | 82,781
Trade and other payables | 22,648
Lease liabilities | 40,021
Other current liabilities | 680
Deferred income tax liabilities | 2,204
Other non-current liabilities | 631
Borrowings | 16,597
Fair value of identifiable net assets | ₩ 10,032

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- Definition The amount recognised as of the acquisition date for borrowings assumed in a business combination. [Refer: Borrowings; Business combinations [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 3 -IssueDate 2021-01-01 -Paragraph B64 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2021-en-r&anchor=para_B64_i&doctype=Appendix&subtype=B -URIDate 2021-03-24 + Details
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- Definition The amount recognised as of the acquisition date for cash and cash equivalents acquired in a business combination. [Refer: Cash and cash equivalents; Business combinations [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 3 -IssueDate 2021-01-01 -Paragraph B64 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2021-en-r&anchor=para_B64_i&doctype=Appendix&subtype=B -URIDate 2021-03-24 + Details
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- Definition The amount recognised as of the acquisition date for customer-related intangible assets acquired in a business combination. [Refer: Customer-related intangible assets [member]; Business combinations [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 3 -IssueDate 2021-01-01 -Paragraph B64 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2021-en-r&anchor=para_B64_i&doctype=Appendix&subtype=B -URIDate 2021-03-24 + Details
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- Definition The amount recognised as of the acquisition date for deferred tax assets acquired in a business combination. [Refer: Deferred tax assets; Business combinations [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 3 -IssueDate 2021-01-01 -Paragraph B64 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2021-en-r&anchor=para_B64_i&doctype=Appendix&subtype=B -URIDate 2021-03-24 + Details
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- Definition The amount recognised as of the acquisition date for deferred tax liabilities assumed in a business combination. [Refer: Deferred tax liabilities; Business combinations [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 3 -IssueDate 2021-01-01 -Paragraph B64 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2021-en-r&anchor=para_B64_i&doctype=Appendix&subtype=B -URIDate 2021-03-24 + Details
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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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- Definition The amount recognised as of the acquisition date for net identifiable assets acquired or liabilities assumed in a business combination. [Refer: Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 3 -IssueDate 2021-01-01 -Paragraph B64 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2021-en-r&anchor=para_B64_i&doctype=Appendix&subtype=B -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 3 -IssueDate 2021-01-01 -Paragraph IE72 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2021-en-r&anchor=para_IE72&doctype=Illustrative%20Examples -URIDate 2021-03-24 + Details
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- Definition The amount recognised as of the acquisition date for identifiable intangible assets acquired in a business combination. [Refer: Intangible assets other than goodwill; Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 3 -IssueDate 2021-01-01 -Paragraph B64 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2021-en-r&anchor=para_B64_i&doctype=Appendix&subtype=B -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 3 -IssueDate 2021-01-01 -Paragraph IE72 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2021-en-r&anchor=para_IE72&doctype=Illustrative%20Examples -URIDate 2021-03-24 + Details
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- Definition The amount recognised as of the acquisition date for plant, property and equipment acquired in a business combination. [Refer: Property, plant and equipment; Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 3 -IssueDate 2021-01-01 -Paragraph B64 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2021-en-r&anchor=para_B64_i&doctype=Appendix&subtype=B -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 3 -IssueDate 2021-01-01 -Paragraph IE72 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2021-en-r&anchor=para_IE72&doctype=Illustrative%20Examples -URIDate 2021-03-24 + Details
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- Definition The amount recognised as of the acquisition date for trade and other payables assumed in a business combination. [Refer: Trade and other payables; Business combinations [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 3 -IssueDate 2021-01-01 -Paragraph B64 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2021-en-r&anchor=para_B64_i&doctype=Appendix&subtype=B -URIDate 2021-03-24 + Details
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- Definition Current provisions recognised as of acquisition date. + References No definition available. + Details
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- Definition Current tax liabilities recognized as of acquisition date. + References No definition available. + Details
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- Definition Finance lease receivables recognised as of acquisition date. + References No definition available. + Details
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- Definition Identifiable assets acquired as of acquistion date. + References No definition available. + Details
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- Definition Identifiable liabilities assumed as of acquistion date. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Investment properties recognised as of acquisition date. + References No definition available. + Details
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Balance Type: | debit
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- Definition Investments in associates and joint ventures recognised as of acquisition date. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Lease liabilities recognised as of acquisition date. + References No definition available. + Details
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Namespace Prefix: | kt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Longterm finance lease receivables recognised as of acquisition date. + References No definition available. + Details
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- Definition Net defined benefit liabilities recognised as of acquisition date. + References No definition available. + Details
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- Definition Noncurrent other assets recognised as of acquisition date. + References No definition available. + Details
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- Definition Other current tax liabilities recognised as of acquisition date. + References No definition available. + Details
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- Definition Other financial assets recognised as of acquisition date. + References No definition available. + Details
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- Definition Other non current financial assets recognised as of acquisition date. + References No definition available. + Details
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- Definition Other non-current tax liabilities recognised as of acquisition date. + References No definition available. + Details
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- Definition Right of use assets recognised as of acquisition date. + References No definition available. + Details
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- Definition Trade and other receivables recognised as of acquisition date. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Details
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