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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of subsidiaries [line items]      
Accumulated non-controlling interests at the beginning of the year ₩ 1,590,625    
Profit or loss allocated to non-controlling interests 125,165 ₩ 102,517 ₩ 45,367
Accumulated non-controlling interests at the end of the year ₩ 1,802,551 ₩ 1,590,625  
KT Skylife Co., Ltd. [member]      
Disclosure of subsidiaries [line items]      
Non-controlling Interests rate(%) 49.80% 49.70% 49.70%
Accumulated non-controlling interests at the beginning of the year ₩ 410,695 ₩ 388,900 ₩ 375,906
Profit or loss allocated to non-controlling interests 7,127 24,795 22,171
Dividends paid to non-controlling interests (8,284) (8,279) (8,279)
Others 13,651 5,279 (898)
Accumulated non-controlling interests at the end of the year ₩ 423,189 ₩ 410,695 ₩ 388,900
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 ₩ 498,928 ₩ 411,826 ₩ 417,475
Profit or loss allocated to non-controlling interests 47,909 34,496 9,899
Dividends paid to non-controlling interests (7,641) (6,434) (22,787)
Others (14,539) 59,040 7,239
Accumulated non-controlling interests at the end of the year ₩ 524,657 498,928 ₩ 411,826
KT Powertel Co., Ltd. [member]      
Disclosure of subsidiaries [line items]      
Non-controlling Interests rate(%)     55.20%
Accumulated non-controlling interests at the beginning of the year   55,747 ₩ 54,276
Profit or loss allocated to non-controlling interests     2,151
Dividends paid to non-controlling interests     (478)
Others     (202)
Accumulated non-controlling interests at the end of the year     ₩ 55,747
KT Alpha Co., Ltd. (KT Hitel Co., Ltd.)      
Disclosure of subsidiaries [line items]      
Non-controlling Interests rate(%)     32.90%
Accumulated non-controlling interests at the beginning of the year   50,306 ₩ 54,709
Profit or loss allocated to non-controlling interests     (1,840)
Others     (2,563)
Accumulated non-controlling interests at the end of the year     ₩ 50,306
KT Telecop Co., Ltd. [member]      
Disclosure of subsidiaries [line items]      
Non-controlling Interests rate(%)     13.20%
Accumulated non-controlling interests at the beginning of the year   ₩ 3,594 ₩ 3,650
Profit or loss allocated to non-controlling interests     152
Others     (208)
Accumulated non-controlling interests at the end of the year     3,594
KTIS Corporation [Member]      
Disclosure of subsidiaries [line items]      
Non-controlling Interests rate(%) 66.70% 68.60%  
Accumulated non-controlling interests at the beginning of the year ₩ 135,240 ₩ 120,071  
Profit or loss allocated to non-controlling interests 14,965 17,715  
Dividends paid to non-controlling interests (2,226) (1,837)  
Others (6,577) (709)  
Accumulated non-controlling interests at the end of the year ₩ 141,402 ₩ 135,240 120,071
KTCS Corporation [Member]      
Disclosure of subsidiaries [line items]      
Non-controlling Interests rate(%) 78.30% 79.70%  
Accumulated non-controlling interests at the beginning of the year ₩ 145,111 ₩ 129,502  
Profit or loss allocated to non-controlling interests 18,888 21,394  
Dividends paid to non-controlling interests (2,721) (2,211)  
Others (7,397) (3,574)  
Accumulated non-controlling interests at the end of the year ₩ 153,881 ₩ 145,111 129,502
Nasmedia Co., Ltd [Member]      
Disclosure of subsidiaries [line items]      
Non-controlling Interests rate(%) 56.00% 56.00%  
Accumulated non-controlling interests at the beginning of the year ₩ 124,181 ₩ 112,549  
Profit or loss allocated to non-controlling interests 15,610 15,185  
Dividends paid to non-controlling interests (4,187) (3,808)  
Others (179) 255  
Accumulated non-controlling interests at the end of the year ₩ 135,425 ₩ 124,181 ₩ 112,549