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Information About Non-controlling Interests - Summary of Changes in Accumulated Non-controlling Interests (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of subsidiaries [line items]      
Accumulated non-controlling interests at the beginning of the year ₩ 1,802,551    
Profit or loss allocated to non-controlling interests (21,143) ₩ 125,165 ₩ 102,517
Accumulated non-controlling interests at the end of the year ₩ 1,811,961 ₩ 1,802,551  
KT Skylife Co., Ltd. [member]      
Disclosure of subsidiaries [line items]      
Non-controlling Interests rate(%) 49.40% 49.80% 49.70%
Accumulated non-controlling interests at the beginning of the year ₩ 423,189 ₩ 410,695 ₩ 388,900
Profit or loss allocated to non-controlling interests (47,355) 7,127 24,795
Dividends paid to non-controlling interests (8,287) (8,284) (8,279)
Others (6,192) 13,651 5,279
Accumulated non-controlling interests at the end of the year ₩ 361,355 ₩ 423,189 ₩ 410,695
BC Card Co., Ltd. [member]      
Disclosure of subsidiaries [line items]      
Non-controlling Interests rate(%) 30.50% 30.50% 30.50%
Accumulated non-controlling interests at the beginning of the year ₩ 524,657 ₩ 498,928 ₩ 411,826
Profit or loss allocated to non-controlling interests 25,355 47,909 34,496
Dividends paid to non-controlling interests (4,960) (7,641) (6,434)
Others 3,023 (14,539) 59,040
Accumulated non-controlling interests at the end of the year ₩ 548,075 ₩ 524,657 ₩ 498,928
KTIS Corporation [Member]      
Disclosure of subsidiaries [line items]      
Non-controlling Interests rate(%) 66.70% 66.70% 68.60%
Accumulated non-controlling interests at the beginning of the year ₩ 141,402 ₩ 135,240 ₩ 120,071
Profit or loss allocated to non-controlling interests 5,947 14,965 17,715
Dividends paid to non-controlling interests (2,451) (2,226) (1,837)
Others (1,872) (6,577) (709)
Accumulated non-controlling interests at the end of the year ₩ 143,026 ₩ 141,402 ₩ 135,240
KTCS Corporation [Member]      
Disclosure of subsidiaries [line items]      
Non-controlling Interests rate(%) 78.30% 78.30% 79.70%
Accumulated non-controlling interests at the beginning of the year ₩ 153,881 ₩ 145,111 ₩ 129,502
Profit or loss allocated to non-controlling interests 14,228 18,888 21,394
Dividends paid to non-controlling interests (3,001) (2,721) (2,211)
Others (2,313) (7,397) (3,574)
Accumulated non-controlling interests at the end of the year ₩ 162,795 ₩ 153,881 ₩ 145,111
Nasmedia, Co., Ltd. [Member]      
Disclosure of subsidiaries [line items]      
Non-controlling Interests rate(%) 55.90% 56.00% 56.00%
Accumulated non-controlling interests at the beginning of the year ₩ 135,425 ₩ 124,181 ₩ 112,549
Profit or loss allocated to non-controlling interests 10,679 15,610 15,185
Dividends paid to non-controlling interests (4,028) (4,187) (3,808)
Others (467) (179) 255
Accumulated non-controlling interests at the end of the year ₩ 141,609 ₩ 135,425 ₩ 124,181