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Information About Non-controlling Interests - Summary of Financial Information on Subsidiaries (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2018
Jan. 01, 2017
Dec. 31, 2015
Disclosure of subsidiaries [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  
Equity 14,658,490 13,183,354 ₩ 12,916,942 ₩ 14,190,193 ₩ 12,916,942 ₩ 12,253,627
Operating revenue 23,436,050 23,546,929 23,164,202      
Profit or loss for the year 719,412 546,341 831,845      
Total comprehensive income 664,784 478,053 826,175      
Cash flows from operating activities 4,010,464 3,877,749 4,770,750      
Cash flows from investing activities (2,704,130) (3,483,245) (3,484,958)      
Cash flows from financing activities (531,675) (1,363,499) (943,271)      
Net (decrease)/increase in cash and cash equivalents 775,240 (972,129) 340,847      
Cash and cash equivalents at beginning of year 1,928,182 2,900,311 2,559,464      
Exchange differences 581 (3,134) (1,674)      
Cash and cash equivalents at end of year ₩ 2,703,422 ₩ 1,928,182 ₩ 2,900,311      
KT Skylife Co., Ltd. [member]            
Disclosure of subsidiaries [line items]            
Non-controlling Interests rate (%) 49.73% 49.73% 49.73%      
Current assets ₩ 301,739 ₩ 324,632 ₩ 352,980      
Non-current assets 514,263 468,261 424,968      
Current liabilities 112,411 185,995 151,329      
Non-current liabilities 37,430 24,555 80,123      
Equity 666,161 582,343 546,496      
Operating revenue 694,059 687,752 668,945      
Profit or loss for the year 52,010 57,314 68,863      
Total comprehensive income 47,787 55,586 68,785      
Cash flows from operating activities 183,474 99,269 155,399      
Cash flows from investing activities (139,846) (81,758) (210,480)      
Cash flows from financing activities (77,647)          
Cash flows from financing activities before dividend paid to non-controlling interests   (19,739) (16,647)      
Dividend paid to non-controlling interests (8,279) (9,817) (8,279)      
Net (decrease)/increase in cash and cash equivalents (34,019) (2,228) ₩ (71,728)      
Cash and cash equivalents at beginning of year 65,747          
Cash and cash equivalents at end of year ₩ 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 ₩ 2,997,429 ₩ 3,225,262 ₩ 2,945,584      
Non-current assets 724,950 823,001 705,480      
Current liabilities 2,520,050 2,868,669 2,530,832      
Non-current liabilities 110,486 86,369 71,571      
Equity 1,091,843 1,093,225 1,048,661      
Operating revenue 3,551,715 3,628,995 3,567,512      
Profit or loss for the year 70,889 156,109 163,131      
Total comprehensive income 116,604 141,719 178,744      
Cash flows from operating activities 86,299 108,203 92,818      
Cash flows from investing activities 128,538 (568,518) (37,313)      
Cash flows from financing activities (117,561)          
Cash flows from financing activities before dividend paid to non-controlling interests   (97,221) (147,306)      
Dividend paid to non-controlling interests (35,924) (29,490) (44,637)      
Gain or loss foreign currency translation   (184) (178)      
Net (decrease)/increase in cash and cash equivalents 97,276 (557,536) ₩ (91,801)      
Cash and cash equivalents at beginning of year 177,826          
Exchange differences (13)          
Cash and cash equivalents at end of year ₩ 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 ₩ 84,785 ₩ 73,527 ₩ 69,046      
Non-current assets 39,279 41,598 44,679      
Current liabilities 27,187 18,450 17,910      
Non-current liabilities 1,030 487 1,989      
Equity 95,847 96,188 93,826      
Operating revenue 65,620 69,234 81,390      
Profit or loss for the year (5,545) 2,112 202      
Total comprehensive income (5,792) 2,362 202      
Cash flows from operating activities 11,603 13,895 7,271      
Cash flows from investing activities (2,580) (17,354) (8,191)      
Net (decrease)/increase in cash and cash equivalents 9,023 (3,459) ₩ (920)      
Cash and cash equivalents at beginning of year 6,626          
Cash and cash equivalents at end of year ₩ 15,649 ₩ 6,626        
KT Hitel Co., Ltd. [member]            
Disclosure of subsidiaries [line items]            
Non-controlling Interests rate (%) 32.87% 32.87% 35.27%      
Current assets ₩ 161,162 ₩ 150,368 ₩ 158,210      
Non-current assets 111,546 107,872 90,992      
Current liabilities 63,231 49,922 45,277      
Non-current liabilities 2,812 3,021 1,664      
Equity 206,665 205,297 202,261      
Operating revenue 279,117 227,884 198,994      
Profit or loss for the year 657 3,225 4,298      
Total comprehensive income 738 3,036 1,399      
Cash flows from operating activities 43,855 28,320 28,987      
Cash flows from investing activities (26,335) (36,086) (33,238)      
Gain or loss foreign currency translation   (47) 3      
Net (decrease)/increase in cash and cash equivalents 17,520 (7,766) ₩ (4,251)      
Cash and cash equivalents at beginning of year 21,647          
Exchange differences 19          
Cash and cash equivalents at end of year ₩ 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 ₩ 52,367 ₩ 73,023 ₩ 63,802      
Non-current assets 220,125 191,330 201,751      
Current liabilities 85,648 90,569 53,903      
Non-current liabilities 54,666 41,064 78,441      
Equity 132,178 132,720 133,209      
Operating revenue 328,262 317,591 315,948      
Profit or loss for the year 166 2,885 143      
Total comprehensive income (1,517) (490) 143      
Cash flows from operating activities 40,351 57,262 60,461      
Cash flows from investing activities (76,969) (43,483) (45,243)      
Cash flows from financing activities 10,000          
Net (decrease)/increase in cash and cash equivalents (26,618) 13,779 ₩ 15,218      
Cash and cash equivalents at beginning of year 32,326          
Cash and cash equivalents at end of year ₩ 5,708 ₩ 32,326