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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of associates and joint ventures [line items]      
Current assets ₩ 9,678,243 ₩ 9,716,020  
Non-current assets 20,067,196 20,948,278  
Current liabilities 9,458,104 9,523,137  
Non-current liabilities 7,238,205 8,358,443  
Operating revenue 23,546,929 23,120,878 ₩ 22,699,856
Profit (loss) for the year 546,341 795,117 624,685
Other comprehensive income (68,288) (5,670) (68,835)
Total comprehensive income 478,053 789,447 ₩ 555,850
Korea Information & Technology Fund [member]      
Disclosure of associates and joint ventures [line items]      
Current assets 144,874 154,651  
Non-current assets 273,727 250,257  
Operating revenue 36,462 26,942  
Profit (loss) for the year 12,825 22,338  
Other comprehensive income 1,868 (9,425)  
Total comprehensive income 14,693 12,913  
Dividend received from associates 739 3,201  
KT-SB Venture Investment [member]      
Disclosure of associates and joint ventures [line items]      
Current assets 120 1,009  
Non-current assets 5,770 8,704  
Current liabilities 6 242  
Operating revenue 3 2  
Profit (loss) for the year (1,449) (251)  
Total comprehensive income (1,449) (251)  
Mongolian Telecommunications [Member]      
Disclosure of associates and joint ventures [line items]      
Current assets   9,852  
Non-current assets   9,055  
Current liabilities   3,296  
Operating revenue   10,336  
Profit (loss) for the year   81  
Other comprehensive income   3,178  
Total comprehensive income   3,259  
KT Wibro Infra Co., Ltd. [member]      
Disclosure of associates and joint ventures [line items]      
Current assets   274,811  
Non-current assets   6  
Current liabilities   4,996  
Non-current liabilities   52  
Operating revenue   391  
Profit (loss) for the year   5,025  
Total comprehensive income   5,025  
KT-CKP New Media Investment Fund [member]      
Disclosure of associates and joint ventures [line items]      
Current assets 287 1,801  
Non-current assets 4,333 7,170  
Current liabilities   4  
Operating revenue 1,593 1,684  
Profit (loss) for the year 1,632 1,195  
Total comprehensive income 1,632 ₩ 1,195  
KT-IBKC future investment fund [member]      
Disclosure of associates and joint ventures [line items]      
Current assets 5,499    
Non-current assets 16,302    
Current liabilities 152    
Operating revenue 15    
Profit (loss) for the year (593)    
Total comprehensive income (593)    
K Bank Inc. [member]      
Disclosure of associates and joint ventures [line items]      
Current assets 1,258,969    
Non-current assets 92,137    
Current liabilities 1,116,154    
Non-current liabilities 1,177    
Operating revenue 20,926    
Profit (loss) for the year (83,787)    
Other comprehensive income (746)    
Total comprehensive income ₩ (84,533)