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Information About Non-controlling Interests - Summary of consolidated statements of comprehensive income (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 Comprehensive Income of Subsidiaries [Line Items] |  |  |
Operating revenue | ₩ 26,287,201 | ₩ 25,638,855 | ₩ 24,898,005
Profit (loss) for the year | 972,182 | 1,385,635 | 1,459,395
Other comprehensive income(loss) | 7,447 | (2,194) | 165,567
Total comprehensive income | 979,629 | 1,383,441 | 1,624,962
KT Skylife Co., Ltd. [member] |  |  |
Disclosure of Summarized Consolidated Statements of Comprehensive Income of Subsidiaries [Line Items] |  |  |
Operating revenue | 1,034,342 | 1,038,468 | 772,950
Profit (loss) for the year | (109,407) | 20,941 | 62,309
Other comprehensive income(loss) | (6,625) | 13,544 | 12,686
Total comprehensive income | (116,032) | 34,485 | 74,995
BC Card Co., Ltd. [member] |  |  |
Disclosure of Summarized Consolidated Statements of Comprehensive Income of Subsidiaries [Line Items] |  |  |
Operating revenue | 4,027,450 | 3,897,090 | 3,580,970
Profit (loss) for the year | 76,545 | 148,341 | 120,308
Other comprehensive income(loss) | 13,832 | (5,286) | 2,270
Total comprehensive income | 90,377 | 143,055 | 122,578
KTIS Corporation [Member] |  |  |
Disclosure of Summarized Consolidated Statements of Comprehensive Income of Subsidiaries [Line Items] |  |  |
Operating revenue | 593,162 | 536,229 | 487,801
Profit (loss) for the year | 13,922 | 15,917 | 24,944
Other comprehensive income(loss) | (3,162) | (2,415) | 3,725
Total comprehensive income | 10,760 | 13,502 | 28,669
KTCS Corporation [Member] |  |  |
Disclosure of Summarized Consolidated Statements of Comprehensive Income of Subsidiaries [Line Items] |  |  |
Operating revenue | 1,035,911 | 1,031,010 | 968,499
Profit (loss) for the year | 15,804 | 17,634 | 19,034
Other comprehensive income(loss) | (2,550) | (134) | (2,120)
Total comprehensive income | 13,254 | 17,500 | 16,914
Nasmedia, Co., Ltd. [Member] |  |  |
Disclosure of Summarized Consolidated Statements of Comprehensive Income of Subsidiaries [Line Items] |  |  |
Operating revenue | 147,934 | 153,210 | 125,876
Profit (loss) for the year | 17,703 | 27,691 | 27,120
Other comprehensive income(loss) | (1,890) | (695) | 871
Total comprehensive income | ₩ 15,813 | ₩ 26,996 | ₩ 27,991

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