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Information About Non-controlling Interests - Summary of consolidated statements of comprehensive income (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
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