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Information About Non-controlling Interests - Summary of Financial Information on Subsidiaries (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Disclosure of subsidiaries [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    
Equity 13,049,130 12,782,718 ₩ 12,156,131 ₩ 11,787,557
Accumulated non-controlling interests 1,391,764 1,352,844    
Operating revenue 23,546,929 23,120,878 22,699,856  
Profit or loss for the year 546,341 795,117 624,685  
Total comprehensive income 478,053 789,447 555,850  
The profit or loss allocated to non-controlling interests 84,782 86,755 78,324  
Cash flows from operating activities 3,877,749 4,770,750 4,229,965  
Cash flows from investing activities (3,483,245) (3,484,958) (2,401,868)  
Net (decrease)/increase in cash and cash equivalents ₩ (972,129) ₩ 340,847 ₩ 670,801  
KT Skylife Co., Ltd. [member]        
Disclosure of subsidiaries [Line Items]        
Non-controlling Interests rate(%) 49.73% 49.73% 49.73%  
Current assets ₩ 324,632 ₩ 352,980 ₩ 279,480  
Non-current assets 468,261 424,968 431,814  
Current liabilities 185,995 151,329 143,511  
Non-current liabilities 24,555 80,123 74,339  
Equity 582,343 546,496 493,444  
Accumulated non-controlling interests 328,302 329,676 316,880 297,300
Operating revenue 687,752 668,945 668,521  
Profit or loss for the year 57,314 68,863 72,987  
Total comprehensive income 55,586 68,785 73,147  
The profit or loss allocated to non-controlling interests 9,395 22,445 27,032  
Cash flows from operating activities 99,269 155,399 157,762  
Cash flows from investing activities (81,758) (210,480) (92,350)  
Cash flows from financing activities before dividend paid to non-controlling interests (19,739) (16,647) (35,984)  
Dividend paid to non-controlling interests (9,817) (8,279) (8,325)  
Net (decrease)/increase in cash and cash equivalents ₩ (2,228) ₩ (71,728) ₩ 29,428  
BC Card Co., Ltd. [member]        
Disclosure of subsidiaries [Line Items]        
Non-controlling Interests rate(%) 30.46% 30.46% 30.46%  
Current assets ₩ 3,225,262 ₩ 2,945,584 ₩ 2,291,047  
Non-current assets 823,001 705,480 672,905  
Current liabilities 2,868,669 2,530,832 1,882,363  
Non-current liabilities 86,369 71,571 63,271  
Equity 1,093,225 1,048,661 1,018,318  
Accumulated non-controlling interests 339,067 329,338 322,921 292,931
Operating revenue 3,628,995 3,567,512 3,504,946  
Profit or loss for the year 156,109 163,131 218,969  
Total comprehensive income 141,719 178,744 188,360  
The profit or loss allocated to non-controlling interests 43,961 47,068 62,943  
Cash flows from operating activities 108,203 92,818 128,927  
Cash flows from investing activities (568,518) (37,313) 73,118  
Cash flows from financing activities before dividend paid to non-controlling interests (97,221) (147,306) (75,121)  
Dividend paid to non-controlling interests (29,490) (44,637) (22,650)  
Gain or loss foreign currency translation (184) (178)    
Net (decrease)/increase in cash and cash equivalents ₩ (557,536) ₩ (91,801) ₩ 126,924  
KT Powertel Co., Ltd. [member]        
Disclosure of subsidiaries [Line Items]        
Non-controlling Interests rate(%) 55.15% 55.15% 55.15%  
Current assets ₩ 73,527 ₩ 69,046 ₩ 65,739  
Non-current assets 41,598 44,679 47,776  
Current liabilities 18,450 17,910 16,016  
Non-current liabilities 487 1,989 5,166  
Equity 96,188 93,826 92,333  
Accumulated non-controlling interests 53,053 51,751 50,926 70,231
Operating revenue 69,234 81,390 104,527  
Profit or loss for the year 2,112 202 (32,417)  
Total comprehensive income 2,362 202 (32,417)  
The profit or loss allocated to non-controlling interests 1,165 112 (17,880)  
Cash flows from operating activities 13,895 7,271 (12,016)  
Cash flows from investing activities (17,354) (8,191) 10,691  
Cash flows from financing activities before dividend paid to non-controlling interests     (2,015)  
Dividend paid to non-controlling interests     (1,118)  
Net (decrease)/increase in cash and cash equivalents ₩ (3,459) ₩ (920) ₩ (3,340)  
KT Hitel Co., Ltd. [member]        
Disclosure of subsidiaries [Line Items]        
Non-controlling Interests rate(%) 32.87% 35.27% 36.30%  
Current assets ₩ 150,368 ₩ 158,210 ₩ 157,355  
Non-current assets 107,872 90,992 78,402  
Current liabilities 49,922 45,277 33,656  
Non-current liabilities 3,021 1,664 282  
Equity 205,297 202,261 201,819  
Accumulated non-controlling interests 53,146 51,798 50,689 51,136
Operating revenue 227,884 198,994 162,155  
Profit or loss for the year 3,225 4,298 7,258  
Total comprehensive income 3,036 1,399 6,769  
The profit or loss allocated to non-controlling interests 870 1,274 (608)  
Cash flows from operating activities 28,320 28,987 22,556  
Cash flows from investing activities (36,086) (33,238) (19,949)  
Gain or loss foreign currency translation (47) 3    
Net (decrease)/increase in cash and cash equivalents ₩ (7,766) ₩ (4,251) ₩ 2,607  
KT Telecop Co., Ltd. [member]        
Disclosure of subsidiaries [Line Items]        
Non-controlling Interests rate(%) 13.18% 13.18% 13.18%  
Current assets ₩ 73,023 ₩ 63,802 ₩ 58,457  
Non-current assets 191,330 201,751 210,734  
Current liabilities 90,569 53,903 82,353  
Non-current liabilities 41,064 78,441 52,613  
Equity 132,720 133,209 134,225  
Accumulated non-controlling interests 103,468 103,532 103,428 ₩ 104,821
Operating revenue 317,591 315,948 302,844  
Profit or loss for the year 2,885 143 (7,593)  
Total comprehensive income (490) 143 (7,593)  
The profit or loss allocated to non-controlling interests 381 19 (1,000)  
Cash flows from operating activities 57,262 60,461 36,216  
Cash flows from investing activities (43,483) (45,243) (91,846)  
Cash flows from financing activities before dividend paid to non-controlling interests     (32,491)  
Net (decrease)/increase in cash and cash equivalents ₩ 13,779 ₩ 15,218 ₩ (88,121)