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Information About Non-controlling Interests - Summary of Financial Information on Subsidiaries (Detail) - KRW (₩) ₩ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Disclosure of subsidiaries [line items] |  |  |  |
Current assets | ₩ 14,594,246 | ₩ 12,690,014 |  |
Non-current assets | 28,197,401 | 28,299,796 |  |
Current liabilities | 13,247,637 | 10,699,268 |  |
Non-current liabilities | 11,001,436 | 11,877,846 |  |
Equity | 18,542,575 | 18,412,696 | ₩ 16,567,161 | ₩ 15,551,433
KT Skylife Co., Ltd. [member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Current assets | 425,661 | 420,701 |  |
Non-current assets | 795,182 | 938,465 |  |
Current liabilities | 353,839 | 274,637 |  |
Non-current liabilities | 125,531 | 229,042 |  |
Equity | 741,473 | 855,487 |  |
BC Card Co., Ltd. [member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Current assets | 3,739,847 | 3,152,622 |  |
Non-current assets | 2,613,031 | 2,513,453 |  |
Current liabilities | 3,661,263 | 2,879,551 |  |
Non-current liabilities | 1,061,169 | 1,229,649 |  |
Equity | 1,630,446 | 1,556,875 |  |
KTIS Corporation [Member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Current assets | 111,313 | 102,121 |  |
Non-current assets | 336,296 | 294,087 |  |
Current liabilities | 116,271 | 103,698 |  |
Non-current liabilities | 127,248 | 95,506 |  |
Equity | 204,090 | 197,004 |  |
KTCS Corporation [Member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Current assets | 304,508 | 296,209 |  |
Non-current assets | 130,391 | 123,517 |  |
Current liabilities | 187,621 | 188,379 |  |
Non-current liabilities | 47,228 | 40,240 |  |
Equity | 200,050 | 191,107 |  |
Nasmedia, Co., Ltd. [Member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Current assets | 411,774 | 435,359 |  |
Non-current assets | 101,537 | 81,586 |  |
Current liabilities | 251,207 | 261,381 |  |
Non-current liabilities | 11,129 | 14,349 |  |
Equity | ₩ 250,975 | ₩ 241,215 |  |

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