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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Associates And Joint Ventures [Line Items]      
Current assets ₩ 11,976,685 ₩ 12,157,814  
Non-current assets 22,176,723 20,316,306  
Current liabilities 10,111,455 9,394,123  
Non-current liabilities 8,897,863 8,421,507  
Operating revenue 24,899,189 23,436,050 ₩ 23,546,929
Profit (loss) for the year 699,274 719,412 546,341
Other comprehensive income(loss) 172,338 (54,628) (68,288)
Total comprehensive income(loss) 871,612 664,784 ₩ 478,053
Korea Information & Technology Fund [member]      
Disclosure Of Associates And Joint Ventures [Line Items]      
Current assets 113,233 118,024  
Non-current assets 378,691 326,740  
Operating revenue 70,565 59,524  
Profit (loss) for the year 53,867 45,110  
Other comprehensive income(loss) 6,132 (13,422)  
Total comprehensive income(loss) 59,999 31,688  
Dividends received from associates 4,280 1,842  
KT-SB Venture Investment Fund [member]      
Disclosure Of Associates And Joint Ventures [Line Items]      
Current assets   4,322  
Non-current assets   4,624  
Current liabilities   6  
Profit (loss) for the year   3,056  
Total comprehensive income(loss)   3,056  
KT-IBKC future investment fund [member]      
Disclosure Of Associates And Joint Ventures [Line Items]      
Current assets 28,200 19,922  
Operating revenue 1,694 2,665  
Profit (loss) for the year 779 2,057  
Total comprehensive income(loss) 779 2,057  
KT-CKP New Media Investment Fund [member]      
Disclosure Of Associates And Joint Ventures [Line Items]      
Current assets 3 25  
Non-current assets 267 540  
Operating revenue 56 371  
Profit (loss) for the year 55 (629)  
Total comprehensive income(loss) 55 (629)  
K Bank Inc. [member]      
Disclosure Of Associates And Joint Ventures [Line Items]      
Current assets 2,480,065 2,094,152  
Non-current assets 78,566 90,505  
Current liabilities 2,350,375 1,901,389  
Non-current liabilities 3,784 3,185  
Operating revenue 92,712 66,787  
Profit (loss) for the year (100,773) (79,671)  
Other comprehensive income(loss) (23) 1,432  
Total comprehensive income(loss) ₩ (100,796) ₩ (78,440)