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Information About Non-controlling Interests (Tables) | 12 Months Ended
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Dec. 31, 2023
Text block [abstract] |
Summary of changes in accumulated non-controlling interests | Profit or loss allocated to non-controlling interests and accumulated non-controlling interests of subsidiaries that are material to the Group for the years ended December 31, 2021, 2022 and 2023 are as follows:
(In millions of Korean won) |  | December 31, 2021 |
| Non- controlling Interests rate (%) |  |  | Accumulated non-controlling interests at the beginning of the year |  |  | Profit or loss allocated to non-controlling interests |  |  | Dividends paid to non- controlling interests |  |  | Others |  |  | Accumulated non-controlling interests at the end of the year |
KT Skylife Co., Ltd. |  |  | 49.7 | % |  | ￦ | 388,900 |  |  | ￦ | 24,795 |  |  | ￦ | (8,279 | ) |  | ￦ | 5,279 |  |  | ￦ | 410,695 |
BC Card Co., Ltd. |  |  | 30.5 | % |  |  | 411,826 |  |  |  | 34,496 |  |  |  | (6,434 | ) |  |  | 59,040 |  |  |  | 498,928 |
KTIS Corporation |  |  | 68.6 | % |  |  | 120,071 |  |  |  | 17,715 |  |  |  | (1,837 | ) |  |  | (709 | ) |  |  | 135,240 |
KTCS Corporation |  |  | 79.7 | % |  |  | 129,502 |  |  |  | 21,394 |  |  |  | (2,211 | ) |  |  | (3,574 | ) |  |  | 145,111 |
Nasmedia, Co., Ltd. |  |  | 56.0 | % |  |  | 112,549 |  |  |  | 15,185 |  |  |  | (3,808 | ) |  |  | 255 |  |  |  | 124,181 |
(In millions of Korean won) |  | December 31, 2022 |
| Non- controlling Interests rate (%) |  |  | Accumulated non-controlling interests at the beginning of the year |  |  | Profit or loss allocated to non-controlling interests |  |  | Dividends paid to non- controlling interests |  |  | Others |  |  | Accumulated non-controlling interests at the end of the year |
KT Skylife Co., Ltd. |  |  | 49.8 | % |  | ￦ | 410,695 |  |  | ￦ | 7,127 |  |  | ￦ | (8,284 | ) |  | ￦ | 13,651 |  |  | ￦ | 423,189 |
BC Card Co., Ltd. |  |  | 30.5 | % |  |  | 498,928 |  |  |  | 47,909 |  |  |  | (7,641 | ) |  |  | (14,539 | ) |  |  | 524,657 |
KTIS Corporation |  |  | 66.7 | % |  |  | 135,240 |  |  |  | 14,965 |  |  |  | (2,226 | ) |  |  | (6,577 | ) |  |  | 141,402 |
KTCS Corporation |  |  | 78.3 | % |  |  | 145,111 |  |  |  | 18,888 |  |  |  | (2,721 | ) |  |  | (7,397 | ) |  |  | 153,881 |
Nasmedia, Co., Ltd. |  |  | 56.0 | % |  |  | 124,181 |  |  |  | 15,610 |  |  |  | (4,187 | ) |  |  | (179 | ) |  |  | 135,425 |
(In millions of Korean won) |  | December 31, 2023 |
| Non- controlling Interests rate (%) |  |  | Accumulated non-controlling interests at the beginning of the year |  |  | Profit or loss allocated to non-controlling interests |  |  | Dividends paid to non- controlling interests |  |  | Others |  |  | Accumulated non-controlling interests at the end of the year |
KT Skylife Co., Ltd. |  |  | 49.4 | % |  | ￦ | 423,189 |  |  | ￦ | (47,355 | ) |  | ￦ | (8,287 | ) |  | ￦ | (6,192 | ) |  | ￦ | 361,355 |
BC Card Co., Ltd. |  |  | 30.5 | % |  |  | 524,657 |  |  |  | 25,355 |  |  |  | (4,960 | ) |  |  | 3,023 |  |  |  | 548,075 |
KTIS Corporation |  |  | 66.7 | % |  |  | 141,402 |  |  |  | 5,947 |  |  |  | (2,451 | ) |  |  | (1,872 | ) |  |  | 143,026 |
KTCS Corporation |  |  | 78.3 | % |  |  | 153,881 |  |  |  | 14,228 |  |  |  | (3,001 | ) |  |  | (2,313 | ) |  |  | 162,795 |
Nasmedia Co., Ltd |  |  | 55.9 | % |  |  | 135,425 |  |  |  | 10,679 |  |  |  | (4,028 | ) |  |  | (467 | ) |  |  | 141,609 |
Summary of financial information on subsidiaries |
|  | December 31, 2022 |
(in millions of Korean won) |  | KT Skylife Co., Ltd. |  |  | BC Card Co., Ltd. |  |  | KTIS Corporation |  |  | KTCS Corporation |  |  | Nasmedia, Co., Ltd. |
Current assets |  | ￦ | 420,701 |  |  | ￦ | 3,152,622 |  |  | ￦ | 102,121 |  |  | ￦ | 296,209 |  |  | ￦ | 435,359 |
Non-current assets |  |  | 938,465 |  |  |  | 2,513,453 |  |  |  | 294,087 |  |  |  | 123,517 |  |  |  | 81,586 |
Current liabilities |  |  | 274,637 |  |  |  | 2,879,551 |  |  |  | 103,698 |  |  |  | 188,379 |  |  |  | 261,381 |
Non-current liabilities |  |  | 229,042 |  |  |  | 1,229,649 |  |  |  | 95,506 |  |  |  | 40,240 |  |  |  | 14,349 |
Equity |  |  | 855,487 |  |  |  | 1,556,875 |  |  |  | 197,004 |  |  |  | 191,107 |  |  |  | 241,215 |
|  | December 31, 2023 |
(in millions of Korean won) |  | KT Skylife Co., Ltd. |  |  | BC Card Co., Ltd. |  |  | KTIS Corporation |  |  | KTCS Corporation |  |  | Nasmedia, Co., Ltd. |
Current assets |  | ￦ | 425,661 |  |  | ￦ | 3,739,847 |  |  | ￦ | 111,313 |  |  | ￦ | 304,508 |  |  | ￦ | 411,774 |
Non-current assets |  |  | 795,182 |  |  |  | 2,613,031 |  |  |  | 336,296 |  |  |  | 130,391 |  |  |  | 101,537 |
Current liabilities |  |  | 353,839 |  |  |  | 3,661,263 |  |  |  | 116,271 |  |  |  | 187,621 |  |  |  | 251,207 |
Non-current liabilities |  |  | 125,531 |  |  |  | 1,061,169 |  |  |  | 127,248 |  |  |  | 47,228 |  |  |  | 11,129 |
Equity |  |  | 741,473 |  |  |  | 1,630,446 |  |  |  | 204,090 |  |  |  | 200,050 |  |  |  | 250,975 |
Summary of consolidated statements of comprehensive income | Summarized consolidated statements of comprehensive income for the years ended December 31, 2021,2022 and 2023 are as follows:
|  | 2021 |
(in millions of Korean won) |  | KT Skylife Co., Ltd. |  |  | BC Card Co., Ltd. |  |  | KTIS Corporation |  |  | KTCS Corporation |  |  | Nasmedia, Co., Ltd. |
Operating revenue |  | ￦ | 772,950 |  |  | ￦ | 3,580,970 |  |  | ￦ | 487,801 |  |  | ￦ | 968,499 |  |  | ￦ | 125,876 |
Profit for the year |  |  | 62,309 |  |  |  | 120,308 |  |  |  | 24,944 |  |  |  | 19,034 |  |  |  | 27,120 |
Other comprehensive income (loss) |  |  | 12,686 |  |  |  | 2,270 |  |  |  | 3,725 |  |  |  | (2,120 | ) |  |  | 871 |
Total comprehensive income |  |  | 74,995 |  |  |  | 122,578 |  |  |  | 28,669 |  |  |  | 16,914 |  |  |  | 27,991 |
|  | 2022 |
(in millions of Korean won) |  | KT Skylife Co., Ltd. |  |  | BC Card Co., Ltd. |  |  | KTIS Corporation |  |  | KTCS Corporation |  |  | Nasmedia, Co., Ltd. |
Operating revenue |  | ￦ | 1,038,468 |  |  | ￦ | 3,897,090 |  |  | ￦ | 536,229 |  |  | ￦ | 1,031,010 |  |  | ￦ | 153,210 |
Profit for the year |  |  | 20,941 |  |  |  | 148,341 |  |  |  | 15,917 |  |  |  | 17,634 |  |  |  | 27,691 |
Other comprehensive income (loss) |  |  | 13,544 |  |  |  | (5,286 | ) |  |  | (2,415 | ) |  |  | (134 | ) |  |  | (695 | )
Total comprehensive income |  |  | 34,485 |  |  |  | 143,055 |  |  |  | 13,502 |  |  |  | 17,500 |  |  |  | 26,996 |
|  | 2023 |
(in millions of Korean won) |  | KT Skylife Co., Ltd. |  |  | BC Card Co., Ltd. |  |  | KTIS Corporation |  |  | KTCS Corporation |  |  | Nasmedia, Co., Ltd. |
Operating revenue |  | ￦ | 1,034,342 |  |  | ￦ | 4,027,450 |  |  | ￦ | 593,162 |  |  | ￦ | 1,035,911 |  |  | ￦ | 147,934 |
Profit for the year |  |  | (109,407 | ) |  |  | 76,545 |  |  |  | 13,922 |  |  |  | 15,804 |  |  |  | 17,703 |
Other comprehensive income (loss) |  |  | (6,625 | ) |  |  | 13,832 |  |  |  | (3,162 | ) |  |  | (2,550 | ) |  |  | (1,890 | )
Total comprehensive income |  |  | (116,032 | ) |  |  | 90,377 |  |  |  | 10,760 |  |  |  | 13,254 |  |  |  | 15,813 |
Summary of consolidated statements of cash flows | Summarized consolidated statements of cash flows for the years ended December 31, 2021,2022 and 2023 are as follows:
|  | 2021 |
(in millions of Korean won) |  | KT Skylife Co., Ltd. |  |  | BC Card Co., Ltd. |  |  | KTIS Corporation |  |  | KTCS Corporation |  |  | Nasmedia, Co., Ltd. |
Cash flows from operating activities |  | ￦ | 102,947 |  |  | ￦ | (157,645 | ) |  | ￦ | 49,011 |  |  | ￦ | 6,945 |  |  | ￦ | 44,500 |
Cash flows from investing activities |  |  | (352,116 | ) |  |  | (283,313 | ) |  |  | (27,143 | ) |  |  | (1,039 | ) |  |  | (16,966 | )
Cash flows from financing activities |  |  | 230,010 |  |  |  | 526,563 |  |  |  | (23,126 | ) |  |  | (16,622 | ) |  |  | (9,843 | )
Net increase (decrease) in cash and cash equivalents |  |  | (19,159 | ) |  |  | 85,605 |  |  |  | (1,258 | ) |  |  | (10,716 | ) |  |  | 17,691 |
Cash and cash equivalents at beginning of year |  |  | 99,834 |  |  |  | 240,584 |  |  |  | 31,779 |  |  |  | 75,440 |  |  |  | 53,720 |
Exchange differences |  |  | (3 | ) |  |  | 293 |  |  |  | — |  |  |  | (840 | ) |  |  | (15 | )
Cash and cash equivalents at end of the year |  |  | 80,672 |  |  |  | 326,482 |  |  |  | 30,521 |  |  |  | 63,884 |  |  |  | 71,396 |
|  | 2022 |
(in millions of Korean won) |  | KT Skylife Co., Ltd. |  |  | BC Card Co., Ltd. |  |  | KTIS Corporation |  |  | KTCS Corporation |  |  | Nasmedia, Co., Ltd. |
Cash flows from operating activities |  | ￦ | 176,407 |  |  | ￦ | (798,043 | ) |  | ￦ | 13,809 |  |  | ￦ | 19,423 |  |  | ￦ | 22,015 |
Cash flows from investing activities |  |  | (78,928 | ) |  |  | (7,733 | ) |  |  | 9,813 |  |  |  | 13,245 |  |  |  | 3,845 |
Cash flows from financing activities |  |  | (79,455 | ) |  |  | 914,441 |  |  |  | (29,199 | ) |  |  | (35,578 | ) |  |  | (11,136 | )
Net increase (decrease) in cash and cash equivalents |  |  | 18,024 |  |  |  | 108,665 |  |  |  | (5,577 | ) |  |  | (2,910 | ) |  |  | 14,724 |
Cash and cash equivalents at beginning of year |  |  | 80,672 |  |  |  | 326,482 |  |  |  | 30,521 |  |  |  | 63,884 |  |  |  | 71,396 |
Exchange differences |  |  | (1 | ) |  |  | (100 | ) |  |  | — |  |  |  | 840 |  |  |  | 13 |
Cash and cash equivalents at end of the year |  |  | 98,695 |  |  |  | 435,047 |  |  |  | 24,944 |  |  |  | 61,814 |  |  |  | 86,133 |
|  | 2023 |
(in millions of Korean won) |  | KT Skylife Co., Ltd. |  |  | BC Card Co., Ltd. |  |  | KTIS Corporation |  |  | KTCS Corporation |  |  | Nasmedia, Co., Ltd. |
Cash flows from operating activities |  | ￦ | 207,207 |  |  | ￦ | 82,883 |  |  | ￦ | 50,892 |  |  | ￦ | 55,146 |  |  | ￦ | 8,116 |
Cash flows from investing activities |  |  | (125,343 | ) |  |  | (74,430 | ) |  |  | (17,636 | ) |  |  | (5,901 | ) |  |  | (30,910 | )
Cash flows from financing activities |  |  | (50,811 | ) |  |  | (67,609 | ) |  |  | (32,872 | ) |  |  | (26,948 | ) |  |  | (11,077 | )
Net increase (decrease) in cash and cash equivalents |  |  | 31,053 |  |  |  | (59,156 | ) |  |  | 384 |  |  |  | 22,297 |  |  |  | (33,871 | )
Cash and cash equivalents at beginning of year |  |  | 98,695 |  |  |  | 435,047 |  |  |  | 24,944 |  |  |  | 61,814 |  |  |  | 86,133 |
Exchange differences |  |  | — |  |  |  | (95 | ) |  |  | — |  |  |  | — |  |  |  | 15 |
Cash and cash equivalents at end of the year |  |  | 129,748 |  |  |  | 375,796 |  |  |  | 25,328 |  |  |  | 84,111 |  |  |  | 52,277 |
Summary of changes in ownership interest on the equity attributable to owners |
(in millions of Korean won) |  | 2021 |  |  | 2022 |  |  | 2023 |
Carrying amount of non-controlling interests acquired |  | ￦ | 14,702 |  |  | ￦ | 19,272 |  |  | ￦ | 3,022 |
Consideration paid to non-controlling interests |  |  | 1,095 |  |  |  | 69,652 |  |  |  | 213,819 |
Effect of changes in equity (net amount) |  | ￦ | 15,797 |  |  | ￦ | 88,924 |  |  | ￦ | 216,841 |

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