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Investments in Associates and Joint Ventures - Summary of Financial Information of Associates and Joint Ventures (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Associates And Joint Ventures [Line Items]      
Current assets ₩ 11,154,180 ₩ 11,975,659  
Non-current assets 22,508,365 22,656,555  
Current liabilities 9,192,472 10,148,054  
Non-current liabilities 8,918,640 9,343,476  
Operating revenue 24,440,647 24,899,189 ₩ 23,436,050
Profit (loss) for the year 746,256 695,868 719,412
Other comprehensive income(loss) 23,255 172,338 (54,628)
Total comprehensive income(loss) 769,511 868,206 ₩ 664,784
Korea Information & Technology Fund [member]      
Disclosure Of Associates And Joint Ventures [Line Items]      
Current assets 107,652 113,233  
Non-current assets 402,812 378,691  
Operating revenue 54,473 70,577  
Profit (loss) for the year 36,615 53,867  
Other comprehensive income(loss) 9,647 6,132  
Total comprehensive income(loss) 46,262 59,999  
Dividends received from associates 9,241 4,280  
KT-IBKC future investment fund [member]      
Disclosure Of Associates And Joint Ventures [Line Items]      
Current assets 32,379 28,200  
Operating revenue 6,551 1,694  
Profit (loss) for the year 4,179 779  
Total comprehensive income(loss) 4,179 779  
KT-CKP New Media Investment Fund [member]      
Disclosure Of Associates And Joint Ventures [Line Items]      
Current assets   3  
Non-current assets   267  
Operating revenue   56  
Profit (loss) for the year   55  
Total comprehensive income(loss)   55  
K Bank Inc. [member]      
Disclosure Of Associates And Joint Ventures [Line Items]      
Current assets 4,255,620 2,480,065  
Non-current assets 74,193 78,566  
Current liabilities 3,752,838 2,350,375  
Non-current liabilities 88,155 3,784  
Operating revenue 80,301 92,720  
Profit (loss) for the year (105,374) (100,773)  
Other comprehensive income(loss) (1,126) (23)  
Total comprehensive income(loss) (106,500) ₩ (100,796)  
Hyundai Robotics Co., Ltd. [member]      
Disclosure Of Associates And Joint Ventures [Line Items]      
Current assets 315,886    
Non-current assets 125,619    
Current liabilities 80,615    
Non-current liabilities 59,324    
Operating revenue 195,311    
Profit (loss) for the year (642)    
Other comprehensive income(loss) 11,573    
Total comprehensive income(loss) ₩ 10,931