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Information About Non-controlling Interests - Summary of Financial Information on Subsidiaries (Detail) - KRW (₩) ₩ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Disclosure of subsidiaries [line items] |  |  |  |
Current assets | ₩ 14,366,399 | ₩ 14,594,246 |  |
Non-current assets | 27,636,359 | 28,197,401 |  |
Current liabilities | 14,026,523 | 13,247,637 |  |
Non-current liabilities | 10,008,674 | 11,001,436 |  |
Equity | 17,967,561 | 18,542,575 | ₩ 18,412,696 | ₩ 16,567,161
KT Skylife Co., Ltd. [member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Current assets | 434,876 | 425,661 |  |
Non-current assets | 605,312 | 795,182 |  |
Current liabilities | 242,754 | 353,839 |  |
Non-current liabilities | 220,840 | 125,531 |  |
Equity | 576,594 | 741,473 |  |
BC Card Co., Ltd. [member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Current assets | 3,130,823 | 3,739,847 |  |
Non-current assets | 2,830,224 | 2,613,031 |  |
Current liabilities | 3,147,202 | 3,661,263 |  |
Non-current liabilities | 1,049,521 | 1,061,169 |  |
Equity | 1,764,324 | 1,630,446 |  |
KTIS Corporation [Member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Current assets | 129,015 | 111,313 |  |
Non-current assets | 340,917 | 336,296 |  |
Current liabilities | 122,879 | 116,271 |  |
Non-current liabilities | 138,947 | 127,248 |  |
Equity | 208,106 | 204,090 |  |
KTCS Corporation [Member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Current assets | 293,408 | 304,508 |  |
Non-current assets | 141,659 | 130,391 |  |
Current liabilities | 189,900 | 187,621 |  |
Non-current liabilities | 42,229 | 47,228 |  |
Equity | 202,938 | 200,050 |  |
Nasmedia, Co., Ltd. [Member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Current assets | 427,146 | 411,774 |  |
Non-current assets | 65,636 | 101,537 |  |
Current liabilities | 244,498 | 251,207 |  |
Non-current liabilities | 8,209 | 11,129 |  |
Equity | ₩ 240,075 | ₩ 250,975 |  |

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