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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disclosure of subsidiaries [line items] |  |  |
Accumulated non-controlling interests at the beginning of the year | ₩ 1,590,625 |  |
Profit or loss allocated to non-controlling interests | 125,165 | ₩ 102,517 | ₩ 45,367
Accumulated non-controlling interests at the end of the year | ₩ 1,802,551 | ₩ 1,590,625 |
KT Skylife Co., Ltd. [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Non-controlling Interests rate(%) | 49.80% | 49.70% | 49.70%
Accumulated non-controlling interests at the beginning of the year | ₩ 410,695 | ₩ 388,900 | ₩ 375,906
Profit or loss allocated to non-controlling interests | 7,127 | 24,795 | 22,171
Dividends paid to non-controlling interests | (8,284) | (8,279) | (8,279)
Others | 13,651 | 5,279 | (898)
Accumulated non-controlling interests at the end of the year | ₩ 423,189 | ₩ 410,695 | ₩ 388,900
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 | ₩ 498,928 | ₩ 411,826 | ₩ 417,475
Profit or loss allocated to non-controlling interests | 47,909 | 34,496 | 9,899
Dividends paid to non-controlling interests | (7,641) | (6,434) | (22,787)
Others | (14,539) | 59,040 | 7,239
Accumulated non-controlling interests at the end of the year | ₩ 524,657 | 498,928 | ₩ 411,826
KT Powertel Co., Ltd. [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Non-controlling Interests rate(%) |  |  | 55.20%
Accumulated non-controlling interests at the beginning of the year |  | 55,747 | ₩ 54,276
Profit or loss allocated to non-controlling interests |  |  | 2,151
Dividends paid to non-controlling interests |  |  | (478)
Others |  |  | (202)
Accumulated non-controlling interests at the end of the year |  |  | ₩ 55,747
KT Alpha Co., Ltd. (KT Hitel Co., Ltd.) |  |  |
Disclosure of subsidiaries [line items] |  |  |
Non-controlling Interests rate(%) |  |  | 32.90%
Accumulated non-controlling interests at the beginning of the year |  | 50,306 | ₩ 54,709
Profit or loss allocated to non-controlling interests |  |  | (1,840)
Others |  |  | (2,563)
Accumulated non-controlling interests at the end of the year |  |  | ₩ 50,306
KT Telecop Co., Ltd. [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Non-controlling Interests rate(%) |  |  | 13.20%
Accumulated non-controlling interests at the beginning of the year |  | ₩ 3,594 | ₩ 3,650
Profit or loss allocated to non-controlling interests |  |  | 152
Others |  |  | (208)
Accumulated non-controlling interests at the end of the year |  |  | 3,594
KTIS Corporation [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Non-controlling Interests rate(%) | 66.70% | 68.60% |
Accumulated non-controlling interests at the beginning of the year | ₩ 135,240 | ₩ 120,071 |
Profit or loss allocated to non-controlling interests | 14,965 | 17,715 |
Dividends paid to non-controlling interests | (2,226) | (1,837) |
Others | (6,577) | (709) |
Accumulated non-controlling interests at the end of the year | ₩ 141,402 | ₩ 135,240 | 120,071
KTCS Corporation [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Non-controlling Interests rate(%) | 78.30% | 79.70% |
Accumulated non-controlling interests at the beginning of the year | ₩ 145,111 | ₩ 129,502 |
Profit or loss allocated to non-controlling interests | 18,888 | 21,394 |
Dividends paid to non-controlling interests | (2,721) | (2,211) |
Others | (7,397) | (3,574) |
Accumulated non-controlling interests at the end of the year | ₩ 153,881 | ₩ 145,111 | 129,502
Nasmedia Co., Ltd [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Non-controlling Interests rate(%) | 56.00% | 56.00% |
Accumulated non-controlling interests at the beginning of the year | ₩ 124,181 | ₩ 112,549 |
Profit or loss allocated to non-controlling interests | 15,610 | 15,185 |
Dividends paid to non-controlling interests | (4,187) | (3,808) |
Others | (179) | 255 |
Accumulated non-controlling interests at the end of the year | ₩ 135,425 | ₩ 124,181 | ₩ 112,549

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