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Information About Non-controlling Interests - Summary of Financial Information on Subsidiaries (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of subsidiaries [line items]        
Current assets ₩ 11,154,180 ₩ 11,975,659    
Non-current assets 22,508,365 22,656,555    
Current liabilities 9,192,472 10,148,054    
Non-current liabilities 8,918,640 9,343,476    
Equity 15,551,433 15,140,684 ₩ 14,658,490 ₩ 13,183,354
Operating revenue 24,440,647 24,899,189 23,436,050  
Profit or loss for the year 746,256 695,868 719,412  
Total comprehensive income (loss) 769,511 868,206 664,784  
Cash flows from operating activities 4,739,827 3,745,173 4,010,464  
Cash flows from investing activities (3,761,470) (3,887,472) (2,704,130)  
Cash flows from financing activities (647,585) (249,748) (531,675)  
Net (decrease)/increase in cash and cash equivalents 328,730 (397,528) 775,240  
Cash and cash equivalents at beginning of year 2,305,894 2,703,422 1,928,182  
Exchange differences (2,042) (5,481) 581  
Cash and cash equivalents at end of year ₩ 2,634,624 ₩ 2,305,894 ₩ 2,703,422  
KT Skylife Co., Ltd. [member]        
Disclosure of subsidiaries [line items]        
Non-controlling Interests rate (%) 49.70% 49.70% 49.70%  
Current assets ₩ 480,450 ₩ 459,077 ₩ 301,739  
Non-current assets 439,026 389,199 514,263  
Current liabilities 153,236 123,506 112,411  
Non-current liabilities 21,803 19,333 37,430  
Equity 744,437 705,437 666,161  
Operating revenue 706,631 704,996 694,059  
Profit or loss for the year 58,190 56,008 52,010  
Total comprehensive income (loss) 55,647 55,936 47,787  
Cash flows from operating activities 160,934 152,549 183,474  
Cash flows from investing activities (105,293) (101,594) (139,846)  
Cash flows from financing activities (19,650) (18,833) (77,647)  
Net (decrease)/increase in cash and cash equivalents 35,991 32,122 (34,019)  
Cash and cash equivalents at beginning of year 63,850 31,728 65,747  
Exchange differences (7) 0    
Cash and cash equivalents at end of year ₩ 99,834 ₩ 63,850 ₩ 31,728  
BC Card Co., Ltd. [member]        
Disclosure of subsidiaries [line items]        
Non-controlling Interests rate (%) 30.50% 30.50% 30.50%  
Current assets ₩ 1,785,914 ₩ 2,580,634 ₩ 2,997,429  
Non-current assets 1,298,484 1,332,348 724,950  
Current liabilities 1,602,667 2,452,219 2,520,050  
Non-current liabilities 176,083 142,013 110,486  
Equity 1,305,648 1,318,750 1,091,843  
Operating revenue 3,387,640 3,553,008 3,551,715  
Profit or loss for the year 39,455 115,885 70,889  
Total comprehensive income (loss) 61,796 289,122 116,604  
Cash flows from operating activities (119,163) 429,331 86,299  
Cash flows from investing activities 58,042 (419,894) 128,538  
Cash flows from financing activities 22,790 (5,744) (117,561)  
Net (decrease)/increase in cash and cash equivalents (38,331) 3,693 97,276  
Cash and cash equivalents at beginning of year 279,162 275,089 177,826  
Exchange differences (247) 380 (13)  
Cash and cash equivalents at end of year ₩ 240,584 ₩ 279,162 ₩ 275,089  
KT Powertel Co., Ltd. [member]        
Disclosure of subsidiaries [line items]        
Non-controlling Interests rate (%) 55.20% 55.20% 55.20%  
Current assets ₩ 90,056 ₩ 86,465 ₩ 84,785  
Non-current assets 29,638 31,587 39,279  
Current liabilities 17,045 17,757 27,187  
Non-current liabilities 1,788 2,009 1,030  
Equity 100,861 98,286 95,847  
Operating revenue 65,897 62,846 65,620  
Profit or loss for the year 3,809 3,085 (5,545)  
Total comprehensive income (loss) 3,442 2,469 (5,792)  
Cash flows from operating activities 6,011 780 11,603  
Cash flows from investing activities (3,353) (9,525) (2,580)  
Cash flows from financing activities (1,515) (687)    
Net (decrease)/increase in cash and cash equivalents 1,143 (9,432) 9,023  
Cash and cash equivalents at beginning of year 6,217 15,649 6,626  
Exchange differences 0 0    
Cash and cash equivalents at end of year ₩ 7,360 ₩ 6,217 ₩ 15,649  
KT Hitel Co., Ltd. [member]        
Disclosure of subsidiaries [line items]        
Non-controlling Interests rate (%) 32.90% 32.90% 32.90%  
Current assets ₩ 140,948 ₩ 115,694 ₩ 161,162  
Non-current assets 148,001 164,124 111,546  
Current liabilities 74,045 62,378 63,231  
Non-current liabilities 18,554 12,391 2,812  
Equity 196,350 205,049 206,665  
Operating revenue 350,231 323,065 279,117  
Profit or loss for the year 2,080 1,426 657  
Total comprehensive income (loss) (8,700) (1,840) 738  
Cash flows from operating activities 62,521 49,870 43,855  
Cash flows from investing activities (58,186) (50,138) (26,335)  
Cash flows from financing activities (1,856) (1,860)    
Net (decrease)/increase in cash and cash equivalents 2,479 (2,128) 17,520  
Cash and cash equivalents at beginning of year 37,043 39,186 21,647  
Exchange differences (83) (15) 19  
Cash and cash equivalents at end of year ₩ 39,439 ₩ 37,043 ₩ 39,186  
KT Telecop Co., Ltd. [member]        
Disclosure of subsidiaries [line items]        
Non-controlling Interests rate (%) 13.20% 13.20% 13.20%  
Current assets ₩ 79,076 ₩ 55,908 ₩ 52,367  
Non-current assets 239,380 223,969 220,125  
Current liabilities 136,565 64,218 85,648  
Non-current liabilities 57,172 89,622 54,666  
Equity 124,719 126,037 132,178  
Operating revenue 392,489 332,063 328,262  
Profit or loss for the year 212 (4,875) 166  
Total comprehensive income (loss) (1,319) (6,558) (1,517)  
Cash flows from operating activities 35,834 52,693 40,351  
Cash flows from investing activities (57,976) (44,393) (76,969)  
Cash flows from financing activities 14,652 (5,227) 10,000  
Net (decrease)/increase in cash and cash equivalents (7,490) 3,073 (26,618)  
Cash and cash equivalents at beginning of year 8,781 5,708 32,326  
Exchange differences 0 0    
Cash and cash equivalents at end of year ₩ 1,291 ₩ 8,781 ₩ 5,708