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Information About Non-controlling Interests - Summary of Financial Information on Subsidiaries (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of subsidiaries [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    
Equity 15,144,090 14,658,490 ₩ 13,183,354 ₩ 12,916,942
Operating revenue 24,899,189 23,436,050 23,546,929  
Profit or loss for the year 699,274 719,412 546,341  
Total comprehensive income (loss) 871,612 664,784 478,053  
Cash flows from operating activities 3,745,173 4,010,464 3,877,749  
Cash flows from investing activities (3,887,472) (2,704,130) (3,483,245)  
Cash flows from financing activities (249,748) (531,675) (1,363,499)  
Net (decrease)/increase in cash and cash equivalents (397,528) 775,240 (972,129)  
Cash and cash equivalents at beginning of year 2,703,422 1,928,182 2,900,311  
Exchange differences (5,481) 581 (3,134)  
Cash and cash equivalents at end of year ₩ 2,305,894 ₩ 2,703,422 ₩ 1,928,182  
KT Skylife Co., Ltd. [member]        
Disclosure of subsidiaries [line items]        
Non-controlling Interests rate (%) 49.73% 49.73% 49.73%  
Current assets ₩ 459,077 ₩ 301,739 ₩ 324,632  
Non-current assets 389,199 514,263 468,261  
Current liabilities 123,506 112,411 185,995  
Non-current liabilities 19,333 37,430 24,555  
Equity 705,437 666,161 582,343  
Operating revenue 704,996 694,059 687,752  
Profit or loss for the year 56,008 52,010 57,314  
Total comprehensive income (loss) 55,936 47,787 55,586  
Cash flows from operating activities 152,549 183,474 99,269  
Cash flows from investing activities (101,594) (139,846) (81,758)  
Cash flows from financing activities (18,833) (77,647)    
Cash flows from financing activities before dividend paid to non-controlling interests     (19,739)  
Dividend paid to non-controlling interests (8,279) (8,279) (9,817)  
Net (decrease)/increase in cash and cash equivalents 32,122 (34,019) (2,228)  
Cash and cash equivalents at beginning of year 31,728 65,747    
Cash and cash equivalents at end of year ₩ 63,850 ₩ 31,728 ₩ 65,747  
BC Card Co., Ltd. [member]        
Disclosure of subsidiaries [line items]        
Non-controlling Interests rate (%) 30.46% 30.46% 30.46%  
Current assets ₩ 2,580,634 ₩ 2,997,429 ₩ 3,225,262  
Non-current assets 1,332,348 724,950 823,001  
Current liabilities 2,452,219 2,520,050 2,868,669  
Non-current liabilities 142,013 110,486 86,369  
Equity 1,318,750 1,091,843 1,093,225  
Operating revenue 3,553,008 3,551,715 3,628,995  
Profit or loss for the year 115,885 70,889 156,109  
Total comprehensive income (loss) 289,122 116,604 141,719  
Cash flows from operating activities 429,331 86,299 108,203  
Cash flows from investing activities (419,894) 128,538 (568,518)  
Cash flows from financing activities (5,744) (117,561)    
Cash flows from financing activities before dividend paid to non-controlling interests     (97,221)  
Dividend paid to non-controlling interests (18,900) (35,924) (29,490)  
Gain or loss foreign currency translation     (184)  
Net (decrease)/increase in cash and cash equivalents 3,693 97,276 (557,536)  
Cash and cash equivalents at beginning of year 275,089 177,826    
Exchange differences 380 (13)    
Cash and cash equivalents at end of year ₩ 279,162 ₩ 275,089 ₩ 177,826  
KT Powertel Co., Ltd. [member]        
Disclosure of subsidiaries [line items]        
Non-controlling Interests rate (%) 55.15% 55.15% 55.15%  
Current assets ₩ 86,465 ₩ 84,785 ₩ 73,527  
Non-current assets 31,587 39,279 41,598  
Current liabilities 17,757 27,187 18,450  
Non-current liabilities 2,009 1,030 487  
Equity 98,286 95,847 96,188  
Operating revenue 62,846 65,620 69,234  
Profit or loss for the year 3,085 (5,545) 2,112  
Total comprehensive income (loss) 2,469 (5,792) 2,362  
Cash flows from operating activities 780 11,603 13,895  
Cash flows from investing activities (9,525) (2,580) (17,354)  
Cash flows from financing activities (687)      
Net (decrease)/increase in cash and cash equivalents (9,432) 9,023 (3,459)  
Cash and cash equivalents at beginning of year 15,649 6,626    
Cash and cash equivalents at end of year ₩ 6,217 ₩ 15,649 ₩ 6,626  
KT Hitel Co., Ltd. [member]        
Disclosure of subsidiaries [line items]        
Non-controlling Interests rate (%) 32.87% 32.87% 32.87%  
Current assets ₩ 115,694 ₩ 161,162 ₩ 150,368  
Non-current assets 164,124 111,546 107,872  
Current liabilities 62,378 63,231 49,922  
Non-current liabilities 12,391 2,812 3,021  
Equity 205,049 206,665 205,297  
Operating revenue 323,065 279,117 227,884  
Profit or loss for the year 1,426 657 3,225  
Total comprehensive income (loss) (1,840) 738 3,036  
Cash flows from operating activities 49,870 43,855 28,320  
Cash flows from investing activities (50,138) (26,335) (36,086)  
Cash flows from financing activities (1,860)      
Gain or loss foreign currency translation     (47)  
Net (decrease)/increase in cash and cash equivalents (2,128) 17,520 (7,766)  
Cash and cash equivalents at beginning of year 39,186 21,647    
Exchange differences (15) 19    
Cash and cash equivalents at end of year ₩ 37,043 ₩ 39,186 ₩ 21,647  
KT Telecop Co., Ltd. [member]        
Disclosure of subsidiaries [line items]        
Non-controlling Interests rate (%) 13.18% 13.18% 13.18%  
Current assets ₩ 55,908 ₩ 52,367 ₩ 73,023  
Non-current assets 223,969 220,125 191,330  
Current liabilities 64,218 85,648 90,569  
Non-current liabilities 89,622 54,666 41,064  
Equity 126,037 132,178 132,720  
Operating revenue 332,063 328,262 317,591  
Profit or loss for the year (4,875) 166 2,885  
Total comprehensive income (loss) (6,558) (1,517) (490)  
Cash flows from operating activities 52,693 40,351 57,262  
Cash flows from investing activities (44,393) (76,969) (43,483)  
Cash flows from financing activities (5,227) 10,000    
Net (decrease)/increase in cash and cash equivalents 3,073 (26,618) 13,779  
Cash and cash equivalents at beginning of year 5,708 32,326    
Cash and cash equivalents at end of year ₩ 8,781 ₩ 5,708 ₩ 32,326