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Investments in Associates and Joint Ventures - Summary of Details of Associates (Detail) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
KIF Investment Fund [Member] |  |
Disclosure of associates [line items] |  |
Percentage of ownership | 33.33% | 33.33%
Location | Korea | Korea
Date of financial statements | December | December
K Bank [member] |  |
Disclosure of associates [line items] |  |
Percentage of ownership | 33.72% | 33.72%
Location | Korea | Korea
Date of financial statements | December | December
Hyundai Robotics Co., Ltd. [member] |  |
Disclosure of associates [line items] |  |
Percentage of ownership | 10.00% | 10.00%
Location | Korea | Korea
Date of financial statements | December | December
Megazone Cloud Corporation [Member] |  |
Disclosure of associates [line items] |  |
Percentage of ownership | 6.83% | 6.83%
Location | Korea | Korea
Date of financial statements | December | December
IGIS No. 4681 General Private Real Estate Investment Company [Member] |  |
Disclosure of associates [line items] |  |
Percentage of ownership | 44.64% | 44.64%
Location | Korea | Korea
Date of financial statements | December | December
KT-DSC creative economy youth start-up investment fund [member] |  |
Disclosure of associates [line items] |  |
Percentage of ownership | 28.57% | 28.57%
Location | Korea | Korea
Date of financial statements | December | December
IGIS Professional Investors Private Investment Real Estate Investment LLC No.395 [Member] |  |
Disclosure of associates [line items] |  |
Percentage of ownership | 35.29% | 35.29%
Location | Korea | Korea
Date of financial statements | December | December
LS Marine Solution Co Ltd Formerly KT Submarine Co Ltd [Member] |  |
Disclosure of associates [line items] |  |
Percentage of ownership | 7.30% | 32.90%
Location | Korea | Korea
Date of financial statements | December | December

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- Definition The country in which an associate of the entity is incorporated. [Refer: Associates [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2023-01-01 -Paragraph 16 -Subparagraph b -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2023-en-r&anchor=para_16_b_ii&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2023-01-01 -Paragraph 17 -Subparagraph b -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2023-en-r&anchor=para_17_b_ii&doctype=Standard -URIDate 2023-03-23 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2023-01-01 -Paragraph 21 -Subparagraph a -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2023-en-r&anchor=para_21_a_iii&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The proportion of ownership interest in an associate attributable to the entity. [Refer: Associates [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2023-01-01 -Paragraph 17 -Subparagraph b -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2023-en-r&anchor=para_17_b_iii&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2023-01-01 -Paragraph 16 -Subparagraph b -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2023-en-r&anchor=para_16_b_iii&doctype=Standard -URIDate 2023-03-23 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2023-01-01 -Paragraph 21 -Subparagraph a -Clause iv -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2023-en-r&anchor=para_21_a_iv&doctype=Standard -URIDate 2023-03-23 + Details
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