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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, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of Summarized Consolidated Statements of Comprehensive Income of Subsidiaries [Line Items] |  |  |
Operating revenue | ₩ 26,379,644 | ₩ 26,287,201 | ₩ 25,638,855
Profit (loss) for the year | 406,669 | 972,182 | 1,385,635
Other comprehensive income(loss) | (90,195) | 7,447 | (2,194)
Total comprehensive income | 316,474 | 979,629 | 1,383,441
KT Skylife Co., Ltd. [member] |  |  |
Disclosure of Summarized Consolidated Statements of Comprehensive Income of Subsidiaries [Line Items] |  |  |
Operating revenue | 1,026,644 | 1,034,342 | 1,038,468
Profit (loss) for the year | (156,033) | (109,407) | 20,941
Other comprehensive income(loss) | (3,019) | (6,625) | 13,544
Total comprehensive income | (159,052) | (116,032) | 34,485
BC Card Co., Ltd. [member] |  |  |
Disclosure of Summarized Consolidated Statements of Comprehensive Income of Subsidiaries [Line Items] |  |  |
Operating revenue | 3,806,858 | 4,027,450 | 3,897,090
Profit (loss) for the year | 141,149 | 76,545 | 148,341
Other comprehensive income(loss) | 636 | 13,832 | (5,286)
Total comprehensive income | 141,785 | 90,377 | 143,055
KTIS Corporation [Member] |  |  |
Disclosure of Summarized Consolidated Statements of Comprehensive Income of Subsidiaries [Line Items] |  |  |
Operating revenue | 604,479 | 593,162 | 536,229
Profit (loss) for the year | 11,862 | 13,922 | 15,917
Other comprehensive income(loss) | (4,172) | (3,162) | (2,415)
Total comprehensive income | 7,690 | 10,760 | 13,502
KTCS Corporation [Member] |  |  |
Disclosure of Summarized Consolidated Statements of Comprehensive Income of Subsidiaries [Line Items] |  |  |
Operating revenue | 1,122,264 | 1,035,911 | 1,031,010
Profit (loss) for the year | 6,814 | 15,804 | 17,634
Other comprehensive income(loss) | (133) | (2,550) | (134)
Total comprehensive income | 6,681 | 13,254 | 17,500
Nasmedia, Co., Ltd. [Member] |  |  |
Disclosure of Summarized Consolidated Statements of Comprehensive Income of Subsidiaries [Line Items] |  |  |
Operating revenue | 143,639 | 147,934 | 153,211
Profit (loss) for the year | (3,884) | 17,703 | 27,691
Other comprehensive income(loss) | 898 | (1,890) | (695)
Total comprehensive income | ₩ (2,986) | ₩ 15,813 | ₩ 26,996

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