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Information About Non-controlling Interests - Summary of Changes in Accumulated Non-controlling Interests (Detail) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of subsidiaries [line items] |  |  |
Accumulated non-controlling interests at the beginning of the year | ₩ 1,802,551 |  |
Profit or loss allocated to non-controlling interests | (21,143) | ₩ 125,165 | ₩ 102,517
Accumulated non-controlling interests at the end of the year | ₩ 1,811,961 | ₩ 1,802,551 |
KT Skylife Co., Ltd. [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Non-controlling Interests rate(%) | 49.40% | 49.80% | 49.70%
Accumulated non-controlling interests at the beginning of the year | ₩ 423,189 | ₩ 410,695 | ₩ 388,900
Profit or loss allocated to non-controlling interests | (47,355) | 7,127 | 24,795
Dividends paid to non-controlling interests | (8,287) | (8,284) | (8,279)
Others | (6,192) | 13,651 | 5,279
Accumulated non-controlling interests at the end of the year | ₩ 361,355 | ₩ 423,189 | ₩ 410,695
BC Card Co., Ltd. [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Non-controlling Interests rate(%) | 30.50% | 30.50% | 30.50%
Accumulated non-controlling interests at the beginning of the year | ₩ 524,657 | ₩ 498,928 | ₩ 411,826
Profit or loss allocated to non-controlling interests | 25,355 | 47,909 | 34,496
Dividends paid to non-controlling interests | (4,960) | (7,641) | (6,434)
Others | 3,023 | (14,539) | 59,040
Accumulated non-controlling interests at the end of the year | ₩ 548,075 | ₩ 524,657 | ₩ 498,928
KTIS Corporation [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Non-controlling Interests rate(%) | 66.70% | 66.70% | 68.60%
Accumulated non-controlling interests at the beginning of the year | ₩ 141,402 | ₩ 135,240 | ₩ 120,071
Profit or loss allocated to non-controlling interests | 5,947 | 14,965 | 17,715
Dividends paid to non-controlling interests | (2,451) | (2,226) | (1,837)
Others | (1,872) | (6,577) | (709)
Accumulated non-controlling interests at the end of the year | ₩ 143,026 | ₩ 141,402 | ₩ 135,240
KTCS Corporation [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Non-controlling Interests rate(%) | 78.30% | 78.30% | 79.70%
Accumulated non-controlling interests at the beginning of the year | ₩ 153,881 | ₩ 145,111 | ₩ 129,502
Profit or loss allocated to non-controlling interests | 14,228 | 18,888 | 21,394
Dividends paid to non-controlling interests | (3,001) | (2,721) | (2,211)
Others | (2,313) | (7,397) | (3,574)
Accumulated non-controlling interests at the end of the year | ₩ 162,795 | ₩ 153,881 | ₩ 145,111
Nasmedia, Co., Ltd. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Non-controlling Interests rate(%) | 55.90% | 56.00% | 56.00%
Accumulated non-controlling interests at the beginning of the year | ₩ 135,425 | ₩ 124,181 | ₩ 112,549
Profit or loss allocated to non-controlling interests | 10,679 | 15,610 | 15,185
Dividends paid to non-controlling interests | (4,028) | (4,187) | (3,808)
Others | (467) | (179) | 255
Accumulated non-controlling interests at the end of the year | ₩ 141,609 | ₩ 135,425 | ₩ 124,181

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