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Information About Non-controlling Interests - Summary of consolidated statements of cash flows (Detail) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of Summarized Consolidated Statements of Cash Flows of Subsidiaries [Line Items] |  |  |
Cash flows from operating activities | ₩ 5,503,289 | ₩ 3,597,065 | ₩ 5,561,834
Cash flows from investing activities | (4,620,508) | (4,838,643) | (5,137,474)
Cash flows from financing activities | (452,792) | 669,331 | (41,282)
Net increase (decrease) in cash and cash equivalents | 430,492 | (570,530) | 384,968
Cash and cash equivalents at beginning of year | 2,449,062 | 3,019,592 | 2,634,624
Exchange differences | 503 | 1,717 | 1,890
Cash and cash equivalents at end of year | 2,879,554 | 2,449,062 | 3,019,592
KT Skylife Co., Ltd. [member] |  |  |
Disclosure of Summarized Consolidated Statements of Cash Flows of Subsidiaries [Line Items] |  |  |
Cash flows from operating activities | 207,207 | 176,407 | 102,947
Cash flows from investing activities | (125,343) | (78,928) | (352,116)
Cash flows from financing activities | (50,811) | (79,455) | 230,010
Net increase (decrease) in cash and cash equivalents | 31,053 | 18,024 | (19,159)
Cash and cash equivalents at beginning of year | 98,695 | 80,672 | 99,834
Exchange differences |  | (1) | (3)
Cash and cash equivalents at end of year | 129,748 | 98,695 | 80,672
BC Card Co., Ltd. [member] |  |  |
Disclosure of Summarized Consolidated Statements of Cash Flows of Subsidiaries [Line Items] |  |  |
Cash flows from operating activities | 82,883 | (798,043) | (157,645)
Cash flows from investing activities | (74,430) | (7,733) | (283,313)
Cash flows from financing activities | (67,609) | 914,441 | 526,563
Net increase (decrease) in cash and cash equivalents | (59,156) | 108,665 | 85,605
Cash and cash equivalents at beginning of year | 435,047 | 326,482 | 240,584
Exchange differences | (95) | (100) | 293
Cash and cash equivalents at end of year | 375,796 | 435,047 | 326,482
KTIS Corporation [Member] |  |  |
Disclosure of Summarized Consolidated Statements of Cash Flows of Subsidiaries [Line Items] |  |  |
Cash flows from operating activities | 50,892 | 13,809 | 49,011
Cash flows from investing activities | (17,636) | 9,813 | (27,143)
Cash flows from financing activities | (32,872) | (29,199) | (23,126)
Net increase (decrease) in cash and cash equivalents | 384 | (5,577) | (1,258)
Cash and cash equivalents at beginning of year | 24,944 | 30,521 | 31,779
Cash and cash equivalents at end of year | 25,328 | 24,944 | 30,521
KTCS Corporation [Member] |  |  |
Disclosure of Summarized Consolidated Statements of Cash Flows of Subsidiaries [Line Items] |  |  |
Cash flows from operating activities | 55,146 | 19,423 | 6,945
Cash flows from investing activities | (5,901) | 13,245 | (1,039)
Cash flows from financing activities | (26,948) | (35,578) | (16,622)
Net increase (decrease) in cash and cash equivalents | 22,297 | (2,910) | (10,716)
Cash and cash equivalents at beginning of year | 61,814 | 63,884 | 75,440
Exchange differences |  | 840 | (840)
Cash and cash equivalents at end of year | 84,111 | 61,814 | 63,884
Nasmedia Co Ltd [Member] |  |  |
Disclosure of Summarized Consolidated Statements of Cash Flows of Subsidiaries [Line Items] |  |  |
Cash flows from operating activities | 8,116 | 22,015 | 44,500
Cash flows from investing activities | (30,910) | 3,845 | (16,966)
Cash flows from financing activities | (11,077) | (11,136) | (9,843)
Net increase (decrease) in cash and cash equivalents | (33,871) | 14,724 | 17,691
Cash and cash equivalents at beginning of year | 86,133 | 71,396 | 53,720
Exchange differences | 15 | 13 | (15)
Cash and cash equivalents at end of year | ₩ 52,277 | ₩ 86,133 | ₩ 71,396

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