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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, 2023
Dec. 31, 2022
Disclosure Of Associates And Joint Ventures [Line Items]    
Beginning ₩ 1,480,722 ₩ 1,288,429
Acquisition (Disposal) 101,387 255,041
Share of net profit (loss) from associates and joint ventures (35,634) (16,821)
Others 10,414 (45,927)
Ending 1,556,889 1,480,722
KIF Investment Fund [Member]    
Disclosure Of Associates And Joint Ventures [Line Items]    
Beginning 170,979 178,935
Share of net profit (loss) from associates and joint ventures 5,443 2,502
Others 632 (10,458)
Ending 177,054 170,979
K Bank [member]    
Disclosure Of Associates And Joint Ventures [Line Items]    
Beginning 852,756 831,737
Acquisition (Disposal) 0  
Share of net profit (loss) from associates and joint ventures 1,089 29,010
Others 19,036 (7,991)
Ending 872,881 852,756
Hyundai Robotics Co., Ltd. [member]    
Disclosure Of Associates And Joint Ventures [Line Items]    
Beginning 49,372 48,725
Acquisition (Disposal) 0  
Share of net profit (loss) from associates and joint ventures (1,637) 798
Others (1) (151)
Ending 47,734 49,372
Megazone Cloud Corporation [Member]    
Disclosure Of Associates And Joint Ventures [Line Items]    
Beginning 136,199  
Acquisition (Disposal)   130,001
Share of net profit (loss) from associates and joint ventures (4,583) (22,555)
Others 78 28,753
Ending 131,694 136,199
IGIS No. 4681 General Private Real Estate Investment Company [Member]    
Disclosure Of Associates And Joint Ventures [Line Items]    
Beginning 23,589  
Acquisition (Disposal)   25,000
Share of net profit (loss) from associates and joint ventures (105) (1,411)
Ending 23,484 23,589
KT-DSC creative economy youth start-up investment fund [member]    
Disclosure Of Associates And Joint Ventures [Line Items]    
Beginning 22,123 22,138
Acquisition (Disposal) (500)  
Share of net profit (loss) from associates and joint ventures 3,494 (13)
Others   (2)
Ending 25,117 22,123
IGIS Professional Investors Private Investment Real Estate Investment LLC No.395 [Member]    
Disclosure Of Associates And Joint Ventures [Line Items]    
Beginning 16,620 17,084
Share of net profit (loss) from associates and joint ventures (4,678) (464)
Ending 11,942 16,620
Others [member]    
Disclosure Of Associates And Joint Ventures [Line Items]    
Beginning 209,084  
Acquisition (Disposal) 101,887  
Share of net profit (loss) from associates and joint ventures (34,912)  
Others (32,568)  
Ending 243,491 209,084
Other associates and joint ventures [member]    
Disclosure Of Associates And Joint Ventures [Line Items]    
Beginning 209,084 189,810
Acquisition (Disposal)   100,040
Share of net profit (loss) from associates and joint ventures   (24,688)
Others   (56,078)
Ending   209,084
LS Marine Solution Co Ltd Formerly KT Submarine Co Ltd [Member]    
Disclosure Of Associates And Joint Ventures [Line Items]    
Beginning 0  
Share of net profit (loss) from associates and joint ventures 255  
Others 23,237  
Ending ₩ 23,492 ₩ 0