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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2018
Jan. 01, 2017
Disclosure of information about unconsolidated structured entities controlled by investment entity [line items]          
Current assets ₩ 12,157,814 ₩ 9,828,525   ₩ 11,117,433 ₩ 9,866,302
Non-current assets 20,316,306 20,067,196   20,135,256 20,948,278
Current liabilities 9,394,123 9,474,162   9,744,055 9,539,195
Non-current liabilities 8,421,507 7,238,205   ₩ 7,318,441 ₩ 8,358,443
Operating revenue 23,436,050 23,546,929 ₩ 23,164,202    
Profit (loss) for the year 719,412 546,341 831,845    
Other comprehensive income (54,628) (68,288) (5,670)    
Total comprehensive income 664,784 478,053 ₩ 826,175    
Korea Information & Technology Fund [member]          
Disclosure of information about unconsolidated structured entities controlled by investment entity [line items]          
Current assets 118,024 144,874      
Non-current assets 326,740 273,727      
Operating revenue 59,524 36,462      
Profit (loss) for the year 45,110 12,825      
Other comprehensive income (13,422) 1,868      
Total comprehensive income 31,688 14,693      
Dividends received from associates 1,842 739      
KT-SB Venture Investment Fund [member]          
Disclosure of information about unconsolidated structured entities controlled by investment entity [line items]          
Current assets 4,322 120      
Non-current assets 4,624 5,770      
Current liabilities 6 6      
Operating revenue   3      
Profit (loss) for the year 3,056 (1,449)      
Total comprehensive income 3,056 (1,449)      
KT-IBKC future investment fund [member]          
Disclosure of information about unconsolidated structured entities controlled by investment entity [line items]          
Current assets 19,922 5,499      
Non-current assets   16,302      
Current liabilities   152      
Operating revenue 2,665 15      
Profit (loss) for the year 2,057 (593)      
Total comprehensive income 2,057 (593)      
KT-CKP New Media Investment Fund [member]          
Disclosure of information about unconsolidated structured entities controlled by investment entity [line items]          
Current assets 25 287      
Non-current assets 540 4,333      
Operating revenue 371 1,593      
Profit (loss) for the year (629) 1,632      
Total comprehensive income (629) 1,632      
K Bank Inc. [member]          
Disclosure of information about unconsolidated structured entities controlled by investment entity [line items]          
Current assets 2,094,152 1,258,969      
Non-current assets 90,505 92,137      
Current liabilities 1,901,389 1,116,154      
Non-current liabilities 3,185 1,177      
Operating revenue 66,787 20,926      
Profit (loss) for the year (79,671) (83,787)      
Other comprehensive income 1,432 (746)      
Total comprehensive income ₩ (78,440) ₩ (84,533)