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Information About Non-controlling Interests - Summary of Financial Information on Subsidiaries (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of subsidiaries [line items]        
Current assets ₩ 12,690,014 ₩ 11,858,350    
Non-current assets 28,299,796 25,300,991    
Current liabilities 10,699,268 10,072,432    
Non-current liabilities 11,877,846 10,519,748    
Equity 18,412,696 16,567,161 ₩ 15,551,433 ₩ 15,140,684
Operating revenue 25,638,855 24,898,005 24,099,394  
Profit or loss for the year 1,385,635 1,459,395 746,256  
Total comprehensive income 1,383,441 1,624,962 769,511  
Cash flows from operating activities 3,597,065 5,561,834 4,739,827  
Cash flows from investing activities (4,838,643) (5,137,474) (3,761,470)  
Cash flows from financing activities 669,331 (41,282) (647,585)  
Net increase (decrease) in cash and cash equivalents (570,530) 384,968 328,730  
Cash and cash equivalents at beginning of year 3,019,592 2,634,624 2,305,894  
Exchange differences 1,717 1,890 (2,042)  
Cash and cash equivalents at end of year ₩ 2,449,062 ₩ 3,019,592 ₩ 2,634,624  
KT Skylife Co., Ltd. [member]        
Disclosure of subsidiaries [line items]        
Non-controlling Interests rate (%) 49.80% 49.70% 49.70%  
Current assets ₩ 420,701 ₩ 408,484 ₩ 480,450  
Non-current assets 938,465 867,161 439,026  
Current liabilities 274,637 249,676 153,236  
Non-current liabilities 229,042 220,018 21,803  
Equity 855,487 805,951 744,437  
Operating revenue 1,038,468 772,950 706,631  
Profit or loss for the year 20,941 62,309 58,190  
Total comprehensive income 34,485 74,995 55,647  
Cash flows from operating activities 176,407 102,947 160,934  
Cash flows from investing activities (78,928) (352,116) (105,293)  
Cash flows from financing activities (79,455) 230,010 (19,650)  
Net increase (decrease) in cash and cash equivalents 18,024 (19,159) 35,991  
Cash and cash equivalents at beginning of year 80,672 99,834 63,850  
Exchange differences (1) (3) (7)  
Cash and cash equivalents at end of year ₩ 98,695 ₩ 80,672 ₩ 99,834  
BC Card Co., Ltd. [member]        
Disclosure of subsidiaries [line items]        
Non-controlling Interests rate (%) 30.50% 30.50% 30.50%  
Current assets ₩ 3,152,622 ₩ 1,991,152 ₩ 1,785,914  
Non-current assets 2,513,453 1,942,275 1,298,484  
Current liabilities 2,879,551 1,658,476 1,602,667  
Non-current liabilities 1,229,649 822,528 176,083  
Equity 1,556,875 1,452,423 1,305,648  
Operating revenue 3,897,090 3,580,970 3,387,640  
Profit or loss for the year 148,341 120,308 39,455  
Total comprehensive income 143,055 122,578 61,796  
Cash flows from operating activities (798,043) (157,645) (119,163)  
Cash flows from investing activities (7,733) (283,313) 58,042  
Cash flows from financing activities 914,441 526,563 22,790  
Net increase (decrease) in cash and cash equivalents 108,665 85,605 (38,331)  
Cash and cash equivalents at beginning of year 326,482 240,584 279,162  
Exchange differences (100) 293 (247)  
Cash and cash equivalents at end of year ₩ 435,047 326,482 ₩ 240,584  
KT Powertel Co., Ltd. [member]        
Disclosure of subsidiaries [line items]        
Non-controlling Interests rate (%)     55.20%  
Current assets     ₩ 90,056  
Non-current assets     29,638  
Current liabilities     17,045  
Non-current liabilities     1,788  
Equity     100,861  
Operating revenue     65,897  
Profit or loss for the year     3,809  
Total comprehensive income     3,442  
Cash flows from operating activities     6,011  
Cash flows from investing activities     (3,353)  
Cash flows from financing activities     (1,515)  
Net increase (decrease) in cash and cash equivalents     1,143  
Cash and cash equivalents at beginning of year   7,360 6,217  
Exchange differences     0  
Cash and cash equivalents at end of year     ₩ 7,360  
KT Alpha Co., Ltd. (KT Hitel Co., Ltd.)        
Disclosure of subsidiaries [line items]        
Non-controlling Interests rate (%)     32.90%  
Current assets     ₩ 140,948  
Non-current assets     148,001  
Current liabilities     74,045  
Non-current liabilities     18,554  
Equity     196,350  
Operating revenue     350,231  
Profit or loss for the year     2,080  
Total comprehensive income     (8,700)  
Cash flows from operating activities     62,521  
Cash flows from investing activities     (58,186)  
Cash flows from financing activities     (1,856)  
Net increase (decrease) in cash and cash equivalents     2,479  
Cash and cash equivalents at beginning of year   ₩ 39,439 37,043  
Exchange differences     (83)  
Cash and cash equivalents at end of year     39,439  
KTIS Corporation [Member]        
Disclosure of subsidiaries [line items]        
Non-controlling Interests rate (%) 66.70% 68.60%    
Current assets ₩ 102,121 ₩ 124,420    
Non-current assets 294,087 244,941    
Current liabilities 103,698 103,927    
Non-current liabilities 95,506 73,691    
Equity 197,004 191,743    
Operating revenue 536,229 487,801 454,172  
Profit or loss for the year 15,917 24,944 7,387  
Total comprehensive income 13,502 28,669    
Cash flows from operating activities 13,809 49,011    
Cash flows from investing activities 9,813 (27,143)    
Cash flows from financing activities (29,199) (23,126)    
Net increase (decrease) in cash and cash equivalents (5,577) (1,258)    
Cash and cash equivalents at beginning of year 30,521 31,779    
Exchange differences 0 0    
Cash and cash equivalents at end of year ₩ 24,944 ₩ 30,521 31,779  
KTCS Corporation [Member]        
Disclosure of subsidiaries [line items]        
Non-controlling Interests rate (%) 78.30% 79.70%    
Current assets ₩ 296,209 ₩ 302,953    
Non-current assets 123,517 113,797    
Current liabilities 188,379 189,641    
Non-current liabilities 40,240 44,530    
Equity 191,107 182,579    
Operating revenue 1,031,010 968,499 933,006  
Profit or loss for the year 17,634 19,034 11,323  
Total comprehensive income 17,500 16,914    
Cash flows from operating activities 19,423 6,945    
Cash flows from investing activities 13,245 (1,039)    
Cash flows from financing activities (35,578) (16,622)    
Net increase (decrease) in cash and cash equivalents (2,910) (10,716)    
Cash and cash equivalents at beginning of year 63,884 75,440    
Exchange differences 840 (840)    
Cash and cash equivalents at end of year ₩ 61,814 ₩ 63,884 75,440  
Nasmedia Co., Ltd [Member]        
Disclosure of subsidiaries [line items]        
Non-controlling Interests rate (%) 56.00% 56.00%    
Current assets ₩ 435,359 ₩ 409,345    
Non-current assets 81,586 81,049    
Current liabilities 261,381 248,648    
Non-current liabilities 14,349 19,970    
Equity 241,215 221,776    
Operating revenue 153,210 125,876    
Profit or loss for the year 27,691 27,120    
Total comprehensive income 26,996 27,991    
Cash flows from operating activities 22,015 44,500    
Cash flows from investing activities 3,845 (16,966)    
Cash flows from financing activities (11,136) (9,843)    
Net increase (decrease) in cash and cash equivalents 14,724 17,691    
Cash and cash equivalents at beginning of year 71,396 53,720    
Exchange differences 13 (15)    
Cash and cash equivalents at end of year ₩ 86,133 ₩ 71,396 ₩ 53,720