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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of subsidiaries [line items]      
Accumulated non-controlling interests at the beginning of the year ₩ 1,528,589    
Profit or loss allocated to non-controlling interests 50,165 ₩ 73,841 ₩ 84,782
Accumulated non-controlling interests at the end of the year ₩ 1,520,160 ₩ 1,528,589  
KT Skylife Co., Ltd. [member]      
Disclosure of subsidiaries [line items]      
Non-controlling Interests rate(%) 49.73% 49.73% 49.73%
Accumulated non-controlling interests at the beginning of the year ₩ 374,150 ₩ 328,302 ₩ 329,676
Profit or loss allocated to non-controlling interests 10,029 23,405 9,395
Dividend paid to non-controlling interests (8,279) (8,279) (9,817)
Others 6 30,722 (952)
Accumulated non-controlling interests at the end of the year ₩ 375,906 ₩ 374,150 ₩ 328,302
BC Card Co., Ltd. [member]      
Disclosure of subsidiaries [line items]      
Non-controlling Interests rate(%) 30.46% 30.46% 30.46%
Accumulated non-controlling interests at the beginning of the year ₩ 345,547 ₩ 339,067 ₩ 329,338
Profit or loss allocated to non-controlling interests 37,795 28,418 43,961
Dividend paid to non-controlling interests (18,900) (35,924) (29,490)
Others 53,033 13,986 (4,742)
Accumulated non-controlling interests at the end of the year ₩ 417,475 ₩ 345,547 ₩ 339,067
KT Powertel Co., Ltd. [member]      
Disclosure of subsidiaries [line items]      
Non-controlling Interests rate(%) 55.15% 55.15% 55.15%
Accumulated non-controlling interests at the beginning of the year ₩ 52,865 ₩ 53,053 ₩ 51,751
Profit or loss allocated to non-controlling interests 1,751 (3,058) 1,165
Others (340) 2,870 137
Accumulated non-controlling interests at the end of the year ₩ 54,276 ₩ 52,865 ₩ 53,053
KT Hitel Co., Ltd. [member]      
Disclosure of subsidiaries [line items]      
Non-controlling Interests rate(%) 32.87% 32.87% 32.87%
Accumulated non-controlling interests at the beginning of the year ₩ 52,336 ₩ 53,146 ₩ 51,798
Profit or loss allocated to non-controlling interests 1,720 454 870
Others 653 (1,264) 478
Accumulated non-controlling interests at the end of the year ₩ 54,709 ₩ 52,336 ₩ 53,146
KT Telecop Co., Ltd. [member]      
Disclosure of subsidiaries [line items]      
Non-controlling Interests rate(%) 13.18% 13.18% 13.18%
Accumulated non-controlling interests at the beginning of the year ₩ 103,357 ₩ 103,468 ₩ 103,532
Profit or loss allocated to non-controlling interests (588) 59 381
Others (99,119) (170) (445)
Accumulated non-controlling interests at the end of the year ₩ 3,650 ₩ 103,357 ₩ 103,468