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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of subsidiaries [line items] |  |  |
Accumulated non-controlling interests at the beginning of the year | ₩ 1,539,989 |  |
Profit or loss allocated to non-controlling interests | 102,517 | ₩ 45,367 | ₩ 50,165
Accumulated non-controlling interests at the end of the year | ₩ 1,590,625 | ₩ 1,539,989 |
KT Skylife Co., Ltd. [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Non-controlling Interests rate(%) | 49.70% | 49.70% | 49.70%
Accumulated non-controlling interests at the beginning of the year | ₩ 388,900 | ₩ 375,906 | ₩ 374,150
Profit or loss allocated to non-controlling interests | 24,795 | 22,171 | 10,029
Dividend paid to non-controlling interests | (8,279) | (8,279) | (8,279)
Others | 5,279 | (898) | 6
Accumulated non-controlling interests at the end of the year | ₩ 410,695 | ₩ 388,900 | ₩ 375,906
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 | ₩ 411,826 | ₩ 417,475 | ₩ 345,547
Profit or loss allocated to non-controlling interests | 34,496 | 9,899 | 37,795
Dividend paid to non-controlling interests | (6,434) | (22,787) | (18,900)
Others | 59,040 | 7,239 | 53,033
Accumulated non-controlling interests at the end of the year | 498,928 | ₩ 411,826 | ₩ 417,475
KT Powertel Co., Ltd. [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Non-controlling Interests rate(%) |  | 55.20% | 55.20%
Accumulated non-controlling interests at the beginning of the year | 55,747 | ₩ 54,276 | ₩ 52,865
Profit or loss allocated to non-controlling interests |  | 2,151 | 1,751
Dividend paid to non-controlling interests |  | (478) |
Others |  | (202) | (340)
Accumulated non-controlling interests at the end of the year |  | ₩ 55,747 | ₩ 54,276
KT Alpha Co., Ltd. (KT Hitel Co., Ltd.) |  |  |
Disclosure of subsidiaries [line items] |  |  |
Non-controlling Interests rate(%) |  | 32.90% | 32.90%
Accumulated non-controlling interests at the beginning of the year | 50,306 | ₩ 54,709 | ₩ 52,336
Profit or loss allocated to non-controlling interests |  | (1,840) | 1,720
Others |  | (2,563) | 653
Accumulated non-controlling interests at the end of the year |  | ₩ 50,306 | ₩ 54,709
KT Telecop Co., Ltd. [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Non-controlling Interests rate(%) |  | 13.20% | 13.20%
Accumulated non-controlling interests at the beginning of the year | ₩ 3,594 | ₩ 3,650 | ₩ 103,357
Profit or loss allocated to non-controlling interests |  | 152 | (588)
Others |  | (208) | (99,119)
Accumulated non-controlling interests at the end of the year |  | 3,594 | ₩ 3,650
KTIS Corporation [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Non-controlling Interests rate(%) | 68.60% |  |
Accumulated non-controlling interests at the beginning of the year | ₩ 120,071 |  |
Profit or loss allocated to non-controlling interests | 17,715 |  |
Dividend paid to non-controlling interests | (1,837) |  |
Others | (709) |  |
Accumulated non-controlling interests at the end of the year | ₩ 135,240 | 120,071 |
KTCS Corporation [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Non-controlling Interests rate(%) | 67.80% |  |
Accumulated non-controlling interests at the beginning of the year | ₩ 129,502 |  |
Profit or loss allocated to non-controlling interests | 21,394 |  |
Dividend paid to non-controlling interests | (2,211) |  |
Others | (3,574) |  |
Accumulated non-controlling interests at the end of the year | ₩ 145,111 | 129,502 |
Nasmedia Co., Ltd [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Non-controlling Interests rate(%) | 56.00% |  |
Accumulated non-controlling interests at the beginning of the year | ₩ 112,549 |  |
Profit or loss allocated to non-controlling interests | 15,185 |  |
Dividend paid to non-controlling interests | (3,808) |  |
Others | 255 |  |
Accumulated non-controlling interests at the end of the year | ₩ 124,181 | ₩ 112,549 |

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