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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, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of subsidiaries [line items] |  |  |
Accumulated non-controlling interests at the beginning of the year | ₩ 1,811,961 |  |
Profit or loss allocated to non-controlling interests | (53,192) | ₩ (21,143) | ₩ 125,165
Accumulated non-controlling interests at the end of the year | ₩ 1,785,847 | ₩ 1,811,961 |
KT Skylife Co., Ltd. [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Non-controlling Interests rate(%) | 49.50% | 49.40% | 49.80%
Accumulated non-controlling interests at the beginning of the year | ₩ 361,355 | ₩ 423,189 | ₩ 410,695
Profit or loss allocated to non-controlling interests | (71,590) | (47,355) | 7,127
Dividends paid to non-controlling interests | (8,184) | (8,287) | (8,284)
Others | 680 | (6,192) | 13,651
Accumulated non-controlling interests at the end of the year | ₩ 282,261 | ₩ 361,355 | ₩ 423,189
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 | ₩ 548,075 | ₩ 524,657 | ₩ 498,928
Profit or loss allocated to non-controlling interests | 45,135 | 25,355 | 47,909
Dividends paid to non-controlling interests | (2,010) | (4,960) | (7,641)
Others | 7,222 | 3,023 | (14,539)
Accumulated non-controlling interests at the end of the year | ₩ 598,422 | ₩ 548,075 | ₩ 524,657
KTIS Corporation [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Non-controlling Interests rate(%) | 66.70% | 66.70% | 66.70%
Accumulated non-controlling interests at the beginning of the year | ₩ 143,026 | ₩ 141,402 | ₩ 135,240
Profit or loss allocated to non-controlling interests | 6,305 | 5,947 | 14,965
Dividends paid to non-controlling interests | (2,451) | (2,451) | (2,226)
Others | (861) | (1,872) | (6,577)
Accumulated non-controlling interests at the end of the year | ₩ 146,019 | ₩ 143,026 | ₩ 141,402
KTCS Corporation [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Non-controlling Interests rate(%) | 78.30% | 78.30% | 78.30%
Accumulated non-controlling interests at the beginning of the year | ₩ 162,795 | ₩ 153,881 | ₩ 145,111
Profit or loss allocated to non-controlling interests | 5,221 | 14,228 | 18,888
Dividends paid to non-controlling interests | (2,501) | (3,001) | (2,721)
Others | (566) | (2,313) | (7,397)
Accumulated non-controlling interests at the end of the year | ₩ 164,949 | ₩ 162,795 | ₩ 153,881
Nasmedia, Co., Ltd. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Non-controlling Interests rate(%) | 55.90% | 55.90% | 56.00%
Accumulated non-controlling interests at the beginning of the year | ₩ 141,609 | ₩ 135,425 | ₩ 124,181
Profit or loss allocated to non-controlling interests | (2,071) | 10,679 | 15,610
Dividends paid to non-controlling interests | (4,428) | (4,028) | (4,187)
Others | 419 | (467) | (179)
Accumulated non-controlling interests at the end of the year | ₩ 135,529 | ₩ 141,609 | ₩ 135,425

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