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Investments in Associates and Joint Ventures - Summary of Changes in Investments in Associates and Joint Ventures (Detail) - KRW (₩)
₩ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of information about unconsolidated structured entities controlled by investment entity [line items]    
Beginning ₩ 279,431 ₩ 284,075
Acquisition (Disposal) 26,912 (19,018)
Share of net profit from associates and joint ventures 5,912 (15,480)
Impairment   (3,662)
Others (39,848) 33,516
Ending 272,407 279,431
Korea Information & Technology Fund [member]    
Disclosure of information about unconsolidated structured entities controlled by investment entity [line items]    
Beginning 139,534 134,969
Share of net profit from associates and joint ventures 15,037 4,275
Others (6,316) 290
Ending 148,255 139,534
KT-SB Venture Investment Fund [member]    
Disclosure of information about unconsolidated structured entities controlled by investment entity [line items]    
Beginning 2,942 4,736
Acquisition (Disposal)   (1,069)
Share of net profit from associates and joint ventures 1,528 (725)
Ending 4,470 2,942
Mongolian Telecommunications [member]    
Disclosure of information about unconsolidated structured entities controlled by investment entity [line items]    
Beginning   6,244
Share of net profit from associates and joint ventures   (348)
Others   (5,896)
KT Wibro Infra Co., Ltd. [member]    
Disclosure of information about unconsolidated structured entities controlled by investment entity [line items]    
Beginning   52,200
Acquisition (Disposal)   (52,200)
KT-CKP New Media Investment Fund [member]    
Disclosure of information about unconsolidated structured entities controlled by investment entity [line items]    
Beginning 2,294 4,454
Acquisition (Disposal) (1,229) (2,970)
Share of net profit from associates and joint ventures (784) 810
Ending 281 2,294
Others [Member]    
Disclosure of information about unconsolidated structured entities controlled by investment entity [line items]    
Beginning 81,728 77,851
Acquisition (Disposal) 2,466 3,178
Share of net profit from associates and joint ventures 8,607 (1,952)
Impairment   (3,662)
Others (36,016) 6,313
Ending 56,785 81,728
KT-IBKC future investment fund [member]    
Disclosure of information about unconsolidated structured entities controlled by investment entity [line items]    
Beginning 10,825 3,621
Acquisition (Disposal) (1,050) 7,500
Share of net profit from associates and joint ventures 1,028 (296)
Others (842)  
Ending 9,961 10,825
K Bank Inc. [member]    
Disclosure of information about unconsolidated structured entities controlled by investment entity [line items]    
Beginning 42,108  
Acquisition (Disposal) 26,725 26,543
Share of net profit from associates and joint ventures (19,504) (17,244)
Others 3,326 32,809
Ending ₩ 52,655 ₩ 42,108