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Commitments and Contingencies - Summary of Guarantees Provided by the Group for Third Parties (Detail) - KRW (₩) ₩ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022
Disclosure of detailed information about borrowings [line items] |  |
Used amount | ₩ 10,218,165 | ₩ 10,006,685
KT Estate Inc. [member] | Hana Bank [Member] | Guarantees [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Subject to payment guarantees | Wonju Bando U-bora Mark Bridge Buyer |
Limit | ₩ 103,000 |
Used amount | ₩ 55,314 |
KT Engineering Co Ltd [Member] | Shinhan Bank [member] | Guarantees [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Subject to payment guarantees | Gasan Solar Power Plant Inc. |
Limit | ₩ 4,700 |
Used amount | ₩ 364 |
KT Engineering Co Ltd [Member] | Suhyup Bank [Member] | Guarantees [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Subject to payment guarantees | Korea Cell Inc. |
Limit | ₩ 3,250 |
Used amount | ₩ 50 |
KT Engineering Co Ltd [Member] | Suhyup Bank One [Member] | Guarantees [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Subject to payment guarantees | San-Ya Agricultural Association Corporation |
Limit | ₩ 3,250 |
Used amount | ₩ 51 |
KT Alpha Co Ltd [Member] | T-commerce cash payers [Member] | Guarantees [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Subject to payment guarantees | Cash payers |
Limit | ₩ 821 |
Used amount | ₩ 0 |
Nasmedia, Co., Ltd. [Member] | Korea Securities Finance Corp [Member] | Guarantees [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Subject to payment guarantees | Stockholders Association Members |
Limit | ₩ 1,104 |
Used amount | ₩ 610 |
Bottom of range [member] | KT Estate Inc. [member] | Hana Bank [Member] | Guarantees [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Maturity | Aug. 5, 2022 |
Bottom of range [member] | KT Engineering Co Ltd [Member] | Shinhan Bank [member] | Guarantees [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Maturity | Jan. 7, 2010 |
Bottom of range [member] | KT Engineering Co Ltd [Member] | Suhyup Bank [Member] | Guarantees [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Maturity | Feb. 17, 2014 |
Bottom of range [member] | KT Engineering Co Ltd [Member] | Suhyup Bank One [Member] | Guarantees [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Maturity | Feb. 17, 2014 |
Bottom of range [member] | KT Alpha Co Ltd [Member] | T-commerce cash payers [Member] | Guarantees [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Maturity | Apr. 14, 2023 |
Top of range [member] | KT Estate Inc. [member] | Hana Bank [Member] | Guarantees [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Maturity | Feb. 28, 2025 |
Top of range [member] | KT Engineering Co Ltd [Member] | Shinhan Bank [member] | Guarantees [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Maturity | Jan. 8, 2025 |
Top of range [member] | KT Engineering Co Ltd [Member] | Suhyup Bank [Member] | Guarantees [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Maturity | Feb. 16, 2024 |
Top of range [member] | KT Engineering Co Ltd [Member] | Suhyup Bank One [Member] | Guarantees [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Maturity | Feb. 16, 2024 |
Top of range [member] | KT Alpha Co Ltd [Member] | T-commerce cash payers [Member] | Guarantees [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Maturity | Apr. 12, 2024 |

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