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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure Of Associates And Joint Ventures [Line Items]      
Current assets ₩ 12,690,014 ₩ 11,858,350  
Non-current assets 28,299,796 25,300,991  
Current liabilities 10,699,268 10,072,432  
Non-current liabilities 11,877,846 10,519,748  
Operating revenue 25,638,855 24,898,005 ₩ 24,099,394
Profit (loss) for the year 1,385,635 1,459,395 746,256
Other comprehensive income(loss) (2,194) 165,567 23,255
Total comprehensive income(loss) 1,383,441 1,624,962 ₩ 769,511
KT-IBKC future investment fund [member]      
Disclosure Of Associates And Joint Ventures [Line Items]      
Current assets   24,163  
Operating revenue   5,912  
Profit (loss) for the year   3,184  
Total comprehensive income(loss)   3,184  
K Bank Inc.[Member]      
Disclosure Of Associates And Joint Ventures [Line Items]      
Current assets 16,562,742 13,263,658  
Non-current assets 71,265 70,362  
Current liabilities 14,830,983 11,594,316  
Non-current liabilities 2,168 2,467  
Operating revenue 558,872 287,775  
Profit (loss) for the year 86,498 21,728  
Other comprehensive income(loss) (24,888) (28,211)  
Total comprehensive income(loss) 61,610 (6,483)  
Hyundai Robotics Co., Ltd. [member]      
Disclosure Of Associates And Joint Ventures [Line Items]      
Current assets 278,413 308,776  
Non-current assets 135,380 120,221  
Current liabilities 63,009 91,637  
Non-current liabilities 64,335 57,899  
Operating revenue 181,944 189,255  
Profit (loss) for the year 9,332 (23,730)  
Other comprehensive income(loss) (49) 1,977  
Total comprehensive income(loss) 9,283 (21,753)  
K-Realty CR-REITs No.1 [member]      
Disclosure Of Associates And Joint Ventures [Line Items]      
Current assets   208,825  
Operating revenue   425,363  
Profit (loss) for the year   180,437  
Total comprehensive income(loss)   180,437  
Dividends received from associates   40,142  
KIF Investment Fund [Member]      
Disclosure Of Associates And Joint Ventures [Line Items]      
Current assets 98,132 117,172  
Non-current assets 414,804 419,632  
Operating revenue 19,916 58,791  
Profit (loss) for the year 7,505 50,107  
Other comprehensive income(loss) (11,779) (6,847)  
Total comprehensive income(loss) (4,274) 43,260  
Dividends received from associates 6,531 ₩ 5,640  
Megazone Cloud Corporation [Member]      
Disclosure Of Associates And Joint Ventures [Line Items]      
Current assets 857,089    
Non-current assets 202,767    
Current liabilities 330,619    
Non-current liabilities 94,202    
Operating revenue 1,261,228    
Profit (loss) for the year (293,186)    
Other comprehensive income(loss) (6,609)    
Total comprehensive income(loss) (299,795)    
IGIS No. 4681 General Private Real Estate Investment Company [Member]      
Disclosure Of Associates And Joint Ventures [Line Items]      
Current assets 52,851    
Current liabilities 12    
Operating revenue 9    
Profit (loss) for the year (3,161)    
Total comprehensive income(loss) (3,161)    
KT-DSC creative economy youth start-up investment fund [member]      
Disclosure Of Associates And Joint Ventures [Line Items]      
Current assets 908    
Non-current assets 76,884    
Current liabilities 362    
Operating revenue 19,931    
Profit (loss) for the year (53)    
Total comprehensive income(loss) (53)    
IGIS Professional Investors Private Investment Real Estate Investment LLC No.395 [Member]      
Disclosure Of Associates And Joint Ventures [Line Items]      
Current assets 9,344    
Non-current assets 127,321    
Current liabilities 90,545    
Profit (loss) for the year (474)    
Total comprehensive income(loss) ₩ (474)