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General Information - Summary of Consolidated Subsidiaries (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of subsidiaries [line items]      
Total assets ₩ 34,153,408 ₩ 32,474,120  
Total liabilities 19,009,318 17,815,630  
Operating revenues ₩ 24,899,189 23,436,050 ₩ 23,546,929
Controlling percentage ownership 100.00%    
Profit (loss) for the year ₩ 699,274 ₩ 719,412 ₩ 546,341
KT Powertel Co., Ltd. [member]      
Disclosure of subsidiaries [line items]      
Subsidiary KT Powertel Co., Ltd. KT Powertel Co., Ltd. KT Powertel Co., Ltd.
Total assets ₩ 118,052 ₩ 124,064 ₩ 115,125
Type of Business Trunk radio system business    
Total liabilities ₩ 19,766 28,217 18,937
Location Korea    
Operating revenues ₩ 62,846 ₩ 65,620 69,234
Controlling percentage ownership 44.80% 44.80%  
Profit (loss) for the year ₩ 3,085 ₩ (5,545) ₩ 2,112
Closing month December    
KT Linkus Co., Ltd. [member]      
Disclosure of subsidiaries [line items]      
Subsidiary KT Linkus Co., Ltd. KT Linkus Co., Ltd. KT Linkus Co., Ltd.
Total assets ₩ 70,494 ₩ 54,147 ₩ 59,344
Type of Business Public telephone maintenance    
Total liabilities ₩ 62,088 44,895 51,516
Location Korea    
Operating revenues ₩ 97,892 ₩ 106,337 112,043
Controlling percentage ownership 92.40% 92.40%  
Profit (loss) for the year ₩ (2,258) ₩ 1,216 ₩ 725
Closing month December    
KT Submarine Co., Ltd. [member]      
Disclosure of subsidiaries [line items]      
Subsidiary KT Submarine Co., Ltd. KT Submarine Co., Ltd. KT Submarine Co., Ltd.
Total assets ₩ 120,947 ₩ 130,715 ₩ 142,797
Type of Business Submarine cable construction and maintenance    
Total liabilities ₩ 18,452 27,530 34,056
Location Korea    
Operating revenues ₩ 55,244 ₩ 61,652 73,985
Controlling percentage ownership 39.30% 39.30%  
Profit (loss) for the year ₩ 486 ₩ (4,286) ₩ 8,243
Closing month December    
KT Telecop Co., Ltd. [member]      
Disclosure of subsidiaries [line items]      
Subsidiary KT Telecop Co., Ltd. KT Telecop Co., Ltd. KT Telecop Co., Ltd.
Total assets ₩ 279,878 ₩ 272,492 ₩ 264,353
Type of Business Security service    
Total liabilities ₩ 153,841 140,314 131,633
Location Korea    
Operating revenues ₩ 332,063 ₩ 328,262 317,591
Controlling percentage ownership 86.80% 86.80%  
Profit (loss) for the year ₩ (4,875) ₩ 166 ₩ 2,885
Closing month December    
KT Hitel Co., Ltd. [member]      
Disclosure of subsidiaries [line items]      
Subsidiary KT Hitel Co., Ltd. KT Hitel Co., Ltd. KT Hitel Co., Ltd.
Total assets ₩ 279,818 ₩ 272,708 ₩ 258,240
Type of Business Data communication    
Total liabilities ₩ 74,769 66,043 52,943
Location Korea    
Operating revenues ₩ 323,065 ₩ 279,117 227,884
Controlling percentage ownership 67.10% 67.10%  
Profit (loss) for the year ₩ 1,426 ₩ 657 ₩ 3,225
Closing month December    
KT service bukbu Co., Ltd. [member]      
Disclosure of subsidiaries [line items]      
Subsidiary KT Service Bukbu Co., Ltd. KT Service Bukbu Co., Ltd. KT Service Bukbu Co., Ltd.
Total assets ₩ 64,802 ₩ 30,599 ₩ 29,281
Type of Business Opening services of fixed line    
Total liabilities ₩ 58,984 23,964 22,096
Location Korea    
Operating revenues ₩ 219,427 ₩ 195,961 194,837
Controlling percentage ownership 67.30% 67.30%  
Profit (loss) for the year ₩ (445) ₩ (31) ₩ 688
Closing month December    
KT service nambu Co., Ltd. [member]      
Disclosure of subsidiaries [line items]      
Subsidiary KT Service Nambu Co., Ltd. KT Service Nambu Co., Ltd. KT Service Nambu Co., Ltd.
Total assets ₩ 63,917 ₩ 37,452 ₩ 36,076
Type of Business Opening services of fixed line    
Total liabilities ₩ 55,548 27,939 26,412
Location Korea    
Operating revenues ₩ 266,148 ₩ 230,088 232,996
Controlling percentage ownership 77.30% 77.30%  
Profit (loss) for the year ₩ 280 ₩ 160 ₩ 875
Closing month December    
KT Commerce Inc. [Member]      
Disclosure of subsidiaries [line items]      
Subsidiary KT Commerce Inc.    
Type of Business B2C, B2B service    
Location Korea    
Controlling percentage ownership 100.00% 100.00%  
Closing month December    
KT Strategic Investment Fund No.2 [Member]      
Disclosure of subsidiaries [line items]      
Subsidiary KT Strategic Investment Fund No.2    
Type of Business Investment fund    
Location Korea    
Controlling percentage ownership 100.00% 100.00%  
Closing month December    
KT Strategic Investment Fund No.3 [Member]      
Disclosure of subsidiaries [line items]      
Subsidiary KT Strategic Investment Fund No.3    
Type of Business Investment fund    
Location Korea    
Controlling percentage ownership 100.00% 100.00%  
Closing month December    
KT Strategic Investment Fund No.4 [Member]      
Disclosure of subsidiaries [line items]      
Subsidiary KT Strategic Investment Fund No.4    
Type of Business Investment fund    
Location Korea    
Controlling percentage ownership 100.00% 100.00%  
Closing month December    
KT Strategic Investment Fund No.5 [Member]      
Disclosure of subsidiaries [line items]      
Subsidiary KT Strategic Investment Fund No.5    
Type of Business Investment fund    
Location Korea    
Controlling percentage ownership 100.00%    
Closing month December    
BCVP Strategic Investment Fund Number One [member]      
Disclosure of subsidiaries [line items]      
Subsidiary BC-VP Strategic Investment Fund No.1    
Type of Business Investment fund    
Location Korea    
Controlling percentage ownership 100.00% 100.00%  
Closing month December    
BC Card Co., Ltd. [member]      
Disclosure of subsidiaries [line items]      
Subsidiary BC Card Co., Ltd. BC Card Co., Ltd. BC Card Co., Ltd.
Total assets ₩ 3,912,982 ₩ 3,722,379 ₩ 4,048,263
Type of Business Credit card business    
Total liabilities ₩ 2,594,232 2,630,536 2,955,038
Location Korea    
Operating revenues ₩ 3,553,008 ₩ 3,551,715 3,628,995
Controlling percentage ownership 69.50% 69.50%  
Profit (loss) for the year ₩ 115,885 ₩ 70,889 ₩ 156,109
Closing month December    
VP Inc. [Member]      
Disclosure of subsidiaries [line items]      
Subsidiary VP Inc.    
Type of Business Payment security service for credit card, others    
Location Korea    
Controlling percentage ownership 50.90% 50.90%  
Closing month December    
H&C Network [member]      
Disclosure of subsidiaries [line items]      
Subsidiary H&C Network H&C Network H&C Network
Total assets ₩ 282,016 ₩ 245,841 ₩ 273,856
Type of Business Call centre for financial sectors    
Total liabilities ₩ 68,401 63,188 65,446
Location Korea    
Operating revenues ₩ 320,701 ₩ 297,470 277,622
Controlling percentage ownership 100.00% 100.00%  
Profit (loss) for the year ₩ (1,593) ₩ (15,944) ₩ 16,104
Closing month December    
BC Card China Co., Ltd. [Member]      
Disclosure of subsidiaries [line items]      
Subsidiary BC Card China Co., Ltd.    
Type of Business Software development and data processing    
Location China    
Controlling percentage ownership 100.00% 100.00%  
Closing month December    
INITECH Co., Ltd. [Member]      
Disclosure of subsidiaries [line items]      
Subsidiary INITECH Co., Ltd.    
Type of Business Internet banking ASP and security solutions    
Location Korea    
Controlling percentage ownership 58.20% 58.20%  
Closing month December    
Smartro Co., Ltd. [Member]      
Disclosure of subsidiaries [line items]      
Subsidiary Smartro Co., Ltd.    
Type of Business VAN (Value Added Network) business    
Location Korea    
Controlling percentage ownership 64.50% 81.10%  
Closing month December    
KTDS Co., Ltd. [member]      
Disclosure of subsidiaries [line items]      
Subsidiary KTDS Co., Ltd. KTDS Co., Ltd. KTDS Co., Ltd.
Total assets ₩ 158,153 ₩ 148,675 ₩ 144,922
Type of Business System integration and maintenance    
Total liabilities ₩ 105,462 95,834 93,343
Location Korea    
Operating revenues ₩ 428,758 ₩ 434,302 459,266
Controlling percentage ownership 95.50% 95.50%  
Profit (loss) for the year ₩ 9,027 ₩ 8,586 ₩ 11,584
Closing month December    
KT M Hows Co., Ltd. [member]      
Disclosure of subsidiaries [line items]      
Subsidiary KT M Hows Co., Ltd. KT M Hows Co., Ltd. KT M Hows Co., Ltd.
Total assets ₩ 74,326 ₩ 60,197 ₩ 42,738
Type of Business Mobile marketing    
Total liabilities ₩ 50,638 42,386 28,489
Location Korea    
Operating revenues ₩ 33,443 ₩ 26,673 24,610
Controlling percentage ownership 90.00% 90.00%  
Profit (loss) for the year ₩ 6,771 ₩ 3,691 ₩ 4,097
Closing month December    
KT M&S Co., Ltd. [member]      
Disclosure of subsidiaries [line items]      
Subsidiary KT M&S Co., Ltd. KT M&S Co., Ltd. KT M&S Co., Ltd.
Total assets ₩ 248,142 ₩ 228,073 ₩ 242,388
Type of Business PCS distribution    
Total liabilities ₩ 215,777 207,740 231,151
Location Korea    
Operating revenues ₩ 813,498 ₩ 791,652 734,420
Controlling percentage ownership 100.00% 100.00%  
Profit (loss) for the year ₩ 12,732 ₩ 11,408 ₩ (9,707)
Closing month December    
GENIE Music Corporation K T Music Corporation [member]      
Disclosure of subsidiaries [line items]      
Subsidiary GENIE Music Corporation (KT Music Corporation) GENIE Music Corporation (KT Music Corporation) GENIE Music Corporation (KT Music Corporation)
Total assets ₩ 234,131 ₩ 221,559 ₩ 139,686
Type of Business Online music production and distribution    
Total liabilities ₩ 80,952 75,827 48,512
Location Korea    
Operating revenues ₩ 230,480 ₩ 171,314 156,163
Controlling percentage ownership 36.00% 36.00%  
Profit (loss) for the year ₩ 7,658 ₩ 6,374 ₩ (3,401)
Closing month December    
KT MOS Bukbu Co.,Ltd. [member]      
Disclosure of subsidiaries [line items]      
Subsidiary KT MOS Bukbu Co., Ltd. KT MOS Bukbu Co., Ltd.  
Total assets ₩ 33,376 ₩ 14,121  
Type of Business Telecommunication facility maintenance    
Total liabilities ₩ 28,841 10,571  
Location Korea    
Operating revenues ₩ 63,761 ₩ 16,543  
Controlling percentage ownership 100.00% 100.00%  
Profit (loss) for the year ₩ 353 ₩ (782)  
Closing month December    
KTMOS Nambu Co.,Ltd. [member]      
Disclosure of subsidiaries [line items]      
Subsidiary KT MOS Nambu Co., Ltd. KT MOS Nambu Co., Ltd.  
Total assets ₩ 34,258 ₩ 14,313  
Type of Business Telecommunication facility maintenance    
Total liabilities ₩ 26,722 8,927  
Location Korea    
Operating revenues ₩ 67,300 ₩ 14,941  
Controlling percentage ownership 98.40% 98.40%  
Profit (loss) for the year ₩ 3,099 ₩ (2,418)  
Closing month December    
KT Skylife Co., Ltd. [member]      
Disclosure of subsidiaries [line items]      
Subsidiary KT Skylife Co., Ltd. KT Skylife Co., Ltd. KT Skylife Co., Ltd.
Total assets ₩ 848,276 ₩ 816,001 ₩ 792,893
Type of Business Satellite broadcasting business    
Total liabilities ₩ 142,839 149,841 210,550
Location Korea    
Operating revenues ₩ 704,996 ₩ 694,059 687,752
Controlling percentage ownership 50.30% 50.30%  
Profit (loss) for the year ₩ 56,008 ₩ 52,010 ₩ 57,314
Closing month December    
Skylife TV Co., Ltd. [Member]      
Disclosure of subsidiaries [line items]      
Subsidiary Skylife TV Co., Ltd.    
Type of Business TV contents provider    
Location Korea    
Controlling percentage ownership 92.60% 92.60%  
Closing month December    
KT Estate Inc. [member]      
Disclosure of subsidiaries [line items]      
Subsidiary KT Estate Inc. KT Estate Inc. KT Estate Inc.
Total assets ₩ 1,686,000 ₩ 1,695,995 ₩ 1,869,194
Type of Business Residential building development and supply    
Total liabilities ₩ 295,706 304,712 502,915
Location Korea    
Operating revenues ₩ 485,686 ₩ 569,269 428,446
Controlling percentage ownership 100.00% 100.00%  
Profit (loss) for the year ₩ 48,552 ₩ 51,854 ₩ 52,416
Closing month December    
KT AMC Co., Ltd. [Member]      
Disclosure of subsidiaries [line items]      
Subsidiary KT AMC Co., Ltd.    
Type of Business Asset management and consulting services    
Location Korea    
Controlling percentage ownership 100.00% 100.00%  
Closing month December    
NEXR Co., Ltd. [Member]      
Disclosure of subsidiaries [line items]      
Subsidiary NEXR Co., Ltd.    
Type of Business Cloud system implementation    
Location Korea    
Controlling percentage ownership 100.00% 100.00%  
Closing month December    
KTGDH Co., Ltd. (KTSB Data service) [member]      
Disclosure of subsidiaries [line items]      
Subsidiary KTGDH Co., Ltd.(KTSB Data service) KTGDH Co., Ltd. (KTSB Data service) KTGDH Co., Ltd. (KTSB Data service)
Total assets ₩ 10,437 ₩ 8,632 ₩ 18,306
Type of Business Data centre development and related service    
Total liabilities ₩ 1,628 523 605
Location Korea    
Operating revenues ₩ 3,977 ₩ 4,627 4,950
Controlling percentage ownership 100.00% 51.00%  
Profit (loss) for the year ₩ 344 ₩ (9,576) ₩ (1,651)
Closing month December    
KT Sat Co., Ltd. [member]      
Disclosure of subsidiaries [line items]      
Subsidiary KT Sat Co., Ltd. KT Sat Co., Ltd. KT Sat Co., Ltd.
Total assets ₩ 651,195 ₩ 685,926 ₩ 742,391
Type of Business Satellite communication business    
Total liabilities ₩ 127,523 173,513 220,804
Location Korea    
Operating revenues ₩ 168,376 ₩ 137,186 147,649
Controlling percentage ownership 100.00% 100.00%  
Profit (loss) for the year ₩ 16,497 ₩ 4,921 ₩ 29,601
Closing month December    
Nasmedia Co Ltd [member]      
Disclosure of subsidiaries [line items]      
Subsidiary Nasmedia Co., Ltd. Nasmedia Co., Ltd. Nasmedia Co., Ltd.
Total assets ₩ 356,236 ₩ 303,112 ₩ 315,967
Type of Business Solution provider and IPTV advertisement sales business    
Total liabilities ₩ 203,105 161,164 188,197
Location Korea    
Operating revenues ₩ 117,550 ₩ 106,805 120,667
Controlling percentage ownership 44.00% 42.80%  
Profit (loss) for the year ₩ 22,484 ₩ 20,596 ₩ 26,676
Closing month December    
KT sports [member]      
Disclosure of subsidiaries [line items]      
Subsidiary     KT Sports
Total assets     ₩ 11,131
Total liabilities     7,805
Operating revenues     53,357
Profit (loss) for the year     ₩ (199)
KT Sports Co Ltd [member]      
Disclosure of subsidiaries [line items]      
Subsidiary KT Sports Co., Ltd. KT Sports Co., Ltd.  
Total assets ₩ 15,603 ₩ 9,560  
Type of Business Management of sports group    
Total liabilities ₩ 8,333 6,376  
Location Korea    
Operating revenues ₩ 55,241 ₩ 55,565  
Controlling percentage ownership 100.00% 100.00%  
Profit (loss) for the year ₩ (464) ₩ (154)  
Closing month December    
KT music contents fund no.1 [member]      
Disclosure of subsidiaries [line items]      
Subsidiary KT Music Contents Fund No.1 KT Music Contents Fund No.1 KT Music Contents Fund No.1
Total assets ₩ 10,579 ₩ 14,092 ₩ 13,804
Type of Business Music contents investment business    
Total liabilities ₩ 1,677 1,035 1,041
Location Korea    
Operating revenues ₩ 521 ₩ 559 370
Controlling percentage ownership 80.00% 80.00%  
Profit (loss) for the year ₩ 345 ₩ 294 ₩ (499)
Closing month December    
K T Music Contents Fund No.2 [member]      
Disclosure of subsidiaries [line items]      
Subsidiary KT Music Contents Fund No.2 KT Music Contents Fund No.2 KT Music Contents Fund No.2
Total assets ₩ 7,675 ₩ 7,629 ₩ 7,500
Type of Business Music contents investment business    
Total liabilities ₩ 279 281 11
Location Korea    
Operating revenues ₩ 331 ₩ 150  
Controlling percentage ownership 100.00% 100.00%  
Profit (loss) for the year ₩ 48 ₩ (142) ₩ (11)
Closing month December    
KT-Michigan global content fund [member]      
Disclosure of subsidiaries [line items]      
Subsidiary KT-Michigan Global Content Fund KT-Michigan Global Content Fund KT-Michigan Global Content Fund
Total assets ₩ 11,688 ₩ 12,741 ₩ 14,575
Type of Business Content investment business    
Total liabilities ₩ 61   147
Location Korea    
Operating revenues ₩ 248 ₩ 869 159
Controlling percentage ownership 88.60% 88.60%  
Profit (loss) for the year ₩ (1,113) ₩ (670) ₩ (426)
Closing month December    
Autopion Co., Ltd. [member]      
Disclosure of subsidiaries [line items]      
Subsidiary Autopion Co., Ltd. Autopion Co., Ltd. Autopion Co., Ltd.
Total assets ₩ 7,460 ₩ 8,838 ₩ 6,306
Type of Business Information and communication service    
Total liabilities ₩ 4,894 5,801 3,530
Location Korea    
Operating revenues ₩ 5,604 ₩ 12,035 6,679
Controlling percentage ownership 100.00% 100.00%  
Profit (loss) for the year ₩ (302) ₩ 453 ₩ (618)
Closing month December    
KTCS Corporation [member]      
Disclosure of subsidiaries [line items]      
Subsidiary KTCS Corporation KTCS Corporation KTCS Corporation
Total assets ₩ 378,171 ₩ 350,280 ₩ 348,334
Type of Business Database and online information provider    
Total liabilities ₩ 213,983 188,561 188,764
Location Korea    
Operating revenues ₩ 944,778 ₩ 1,019,787 968,186
Controlling percentage ownership 30.90% 30.90%  
Profit (loss) for the year ₩ 7,597 ₩ 11,401 ₩ 7,385
Closing month December    
KTIS Corporation [member]      
Disclosure of subsidiaries [line items]      
Subsidiary KTIS Corporation KTIS Corporation KTIS Corporation
Total assets ₩ 305,798 ₩ 229,246 ₩ 223,818
Type of Business Database and online information provider    
Total liabilities ₩ 137,524 68,997 62,569
Location Korea    
Operating revenues ₩ 454,561 ₩ 451,532 438,597
Controlling percentage ownership 30.10% 30.10%  
Profit (loss) for the year ₩ 9,205 ₩ 7,900 ₩ 8,337
Closing month December    
KT M mobile Co., Ltd. [member]      
Disclosure of subsidiaries [line items]      
Subsidiary KT M mobile KT M mobile Co., Ltd. KT M mobile Co., Ltd.
Total assets ₩ 135,917 ₩ 146,334 ₩ 93,601
Type of Business Special category telecommunications operator and sales of communication device    
Total liabilities ₩ 30,603 35,335 21,453
Location Korea    
Operating revenues ₩ 161,720 ₩ 172,674 159,684
Controlling percentage ownership 100.00% 100.00%  
Profit (loss) for the year ₩ (5,580) ₩ (10,085) ₩ (38,883)
Closing month December    
KT Investment Co., Ltd. [member]      
Disclosure of subsidiaries [line items]      
Subsidiary KT Investment Co., Ltd. KT Investment Co., Ltd. KT Investment Co., Ltd.
Total assets ₩ 73,463 ₩ 74,580 ₩ 54,673
Type of Business Technology business finance    
Total liabilities ₩ 56,212 58,040 38,313
Location Korea    
Operating revenues ₩ 13,375 ₩ 8,095 8,794
Controlling percentage ownership 100.00% 100.00%  
Profit (loss) for the year ₩ 847 ₩ 247 ₩ (619)
Closing month December    
Whowho&Company Co., Ltd. [Member]      
Disclosure of subsidiaries [line items]      
Subsidiary Whowho&Company Co., Ltd.    
Type of Business Software development and supply    
Location Korea    
Controlling percentage ownership 100.00% 100.00%  
Closing month December    
PlayD Co., Ltd. (N Search Marketing Co., Ltd.) [member]      
Disclosure of subsidiaries [line items]      
Subsidiary PlayD Co., Ltd. (N Search Marketing Co., Ltd.)    
Type of Business Advertising agency    
Location Korea    
Controlling percentage ownership 100.00% 100.00%  
Closing month December    
Next Connect PFV [member]      
Disclosure of subsidiaries [line items]      
Subsidiary Next connect PFV Next connect PFV  
Total assets ₩ 385,412 ₩ 385,769  
Type of Business Residential building development and supply    
Total liabilities ₩ 24,275 34,370  
Location Korea    
Operating revenues ₩ 1,590 ₩ 143  
Controlling percentage ownership 100.00% 100.00%  
Profit (loss) for the year ₩ (5,898) ₩ (12,449)  
Closing month December    
KT Rwanda Networks Ltd. [member]      
Disclosure of subsidiaries [line items]      
Subsidiary KT Rwanda Networks Ltd. KT Rwanda Networks Ltd. KT Rwanda Networks Ltd.
Total assets ₩ 132,461 ₩ 144,129 ₩ 151,359
Type of Business Network installation and management    
Total liabilities ₩ 183,164 162,801 139,561
Location Rwanda    
Operating revenues ₩ 18,013 ₩ 15,150 15,931
Controlling percentage ownership 51.00% 51.00%  
Profit (loss) for the year ₩ (31,662) ₩ (29,238) ₩ (22,762)
Closing month December    
AOS Ltd. [member]      
Disclosure of subsidiaries [line items]      
Subsidiary AOS Ltd. AOS Ltd. AOS Ltd.
Total assets ₩ 12,337 ₩ 14,018 ₩ 9,437
Type of Business System integration and maintenance    
Total liabilities ₩ 3,993 4,952 4,519
Location Rwanda    
Operating revenues ₩ 6,982 ₩ 6,300 8,952
Controlling percentage ownership 51.00% 51.00%  
Profit (loss) for the year ₩ (591) ₩ (680) ₩ (682)
Closing month December    
KT Belgium [member]      
Disclosure of subsidiaries [line items]      
Subsidiary KT Belgium KT Belgium KT Belgium
Total assets ₩ 93,321 ₩ 90,172 ₩ 86,455
Type of Business Foreign investment business    
Total liabilities ₩ 11 1 8
Location Belgium    
Operating revenues   ₩ 29 49
Controlling percentage ownership 100.00% 100.00%  
Profit (loss) for the year ₩ (64) ₩ (43) ₩ (2)
Closing month December    
KT ORS Belgium [member]      
Disclosure of subsidiaries [line items]      
Subsidiary KT ORS Belgium KT ORS Belgium KT ORS Belgium
Total assets ₩ 6,913 ₩ 6,709 ₩ 1,769
Type of Business Foreign investment business    
Total liabilities ₩ 14 ₩ 5 14
Location Belgium    
Operating revenues     10
Controlling percentage ownership 100.00% 100.00%  
Profit (loss) for the year ₩ (43) ₩ (46) ₩ (10)
Closing month December    
Korea Telecom Japan Co., Ltd. [member]      
Disclosure of subsidiaries [line items]      
Subsidiary Korea Telecom Japan Co., Ltd. Korea Telecom Japan Co., Ltd. Korea Telecom Japan Co., Ltd.
Total assets ₩ 1,851 ₩ 1,326 ₩ 1,554
Type of Business Foreign telecommunication business    
Total liabilities ₩ 2,858 2,910 2,788
Location Japan    
Operating revenues ₩ 2,891 ₩ 1,965 2,772
Controlling percentage ownership 100.00% 100.00%  
Profit (loss) for the year ₩ 651 ₩ (126) ₩ 536
Closing month December    
KBTO sp.zo.o. [member]      
Disclosure of subsidiaries [line items]      
Subsidiary KBTO sp.zo.o. KBTO sp.zo.o. KBTO sp.zo.o.
Total assets ₩ 1,767 ₩ 1,364 ₩ 3,311
Type of Business Electronic communication business    
Total liabilities ₩ 245 217 2,268
Location Poland    
Operating revenues ₩ 519 ₩ 202 67
Controlling percentage ownership 97.20% 96.20%  
Profit (loss) for the year ₩ (3,457) ₩ (3,771) ₩ (3,456)
Closing month December    
Korea Telecom China Co., Ltd. [member]      
Disclosure of subsidiaries [line items]      
Subsidiary Korea Telecom China Co., Ltd. Korea Telecom China Co., Ltd. Korea Telecom China Co., Ltd.
Total assets ₩ 879 ₩ 661 ₩ 665
Type of Business Foreign telecommunication business    
Total liabilities ₩ 39 22 32
Location China    
Operating revenues ₩ 844 ₩ 681 1,030
Controlling percentage ownership 100.00% 100.00%  
Profit (loss) for the year ₩ 192 ₩ 10 ₩ 348
Closing month December    
KT Dutch B.V. [member]      
Disclosure of subsidiaries [line items]      
Subsidiary KT Dutch B.V. KT Dutch B.V. KT Dutch B.V.
Total assets ₩ 31,003 ₩ 31,693 ₩ 30,312
Type of Business Super iMax and East Telecom management    
Total liabilities ₩ 50 41 50
Location Netherlands    
Operating revenues   ₩ 191 206
Controlling percentage ownership 100.00% 100.00%  
Profit (loss) for the year ₩ (242) ₩ 105 ₩ 169
Closing month December    
Super iMax LLC [member]      
Disclosure of subsidiaries [line items]      
Subsidiary Super iMax LLC Super iMax LLC Super iMax LLC
Total assets ₩ 3,568 ₩ 4,150 ₩ 3,449
Type of Business Wireless high speed internet business    
Total liabilities ₩ 5,304 4,528 4,886
Location Uzbekistan    
Operating revenues ₩ 4,604 ₩ 4,845 7,314
Controlling percentage ownership 100.00% 100.00%  
Profit (loss) for the year ₩ (631) ₩ (424) ₩ (4,584)
Closing month December    
East Telecom LLC [member]      
Disclosure of subsidiaries [line items]      
Subsidiary East Telecom LLC East Telecom LLC East Telecom LLC
Total assets ₩ 20,857 ₩ 16,590 ₩ 11,672
Type of Business Fixed line telecommunication business    
Total liabilities ₩ 16,302 14,263 11,748
Location Uzbekistan    
Operating revenues ₩ 17,186 ₩ 15,087 19,663
Controlling percentage ownership 91.00% 91.00%  
Profit (loss) for the year ₩ 2,140 ₩ 2,639 ₩ (9,118)
Closing month December    
Korea Telecom America, Inc. [member]      
Disclosure of subsidiaries [line items]      
Subsidiary Korea Telecom America, Inc. Korea Telecom America, Inc. Korea Telecom America, Inc.
Total assets ₩ 4,611 ₩ 4,218 ₩ 3,694
Type of Business Foreign telecommunication business    
Total liabilities ₩ 537 832 791
Location USA    
Operating revenues ₩ 6,808 ₩ 7,554 6,783
Controlling percentage ownership 100.00% 100.00%  
Profit (loss) for the year ₩ 572 ₩ 350 ₩ 109
Closing month December    
PT. KT Indonesia [member]      
Disclosure of subsidiaries [line items]      
Subsidiary PT. KT Indonesia PT. KT Indonesia PT. KT Indonesia
Total assets ₩ 8 ₩ 8 ₩ 8
Type of Business Foreign telecommunication business    
Location Indonesia    
Controlling percentage ownership 99.00% 99.00%  
Profit (loss) for the year     ₩ (6)
Closing month December    
PT BC card Asia Pacific [member]      
Disclosure of subsidiaries [line items]      
Subsidiary PT. BC Card Asia Pacific    
Type of Business Software development and supply    
Location Indonesia    
Controlling percentage ownership 99.90% 99.90%  
Closing month December    
KT Hongkong Telecommunications Co., Ltd. [member]      
Disclosure of subsidiaries [line items]      
Subsidiary KT Hongkong Telecommunications Co., Ltd. KT Hongkong Telecommunications Co., Ltd. KT Hongkong Telecommunications Co., Ltd.
Total assets ₩ 5,126 ₩ 3,616 ₩ 2,578
Type of Business Fixed line communication business    
Total liabilities ₩ 2,923 2,143 1,497
Location Hong Kong    
Operating revenues ₩ 13,321 ₩ 9,990 7,304
Controlling percentage ownership 100.00% 100.00%  
Profit (loss) for the year ₩ 586 ₩ 351 ₩ 494
Closing month December    
Korea Telecom Singapore Pte.Ltd. [member]      
Disclosure of subsidiaries [line items]      
Subsidiary Korea Telecom Singapore Pte. Ltd.    
Type of Business Foreign investment business    
Location Singapore    
Controlling percentage ownership 100.00% 100.00%  
Closing month December    
Texnoprosistem LLP [member]      
Disclosure of subsidiaries [line items]      
Subsidiary Texnoprosistem LLP    
Type of Business Fixed line internet business    
Location Uzbekistan    
Controlling percentage ownership 100.00% 100.00%  
Closing month December    
Nasmedia Thailand Co Ltd [member]      
Disclosure of subsidiaries [line items]      
Subsidiary Nasmedia Thailand Co., Ltd.    
Type of Business Internet advertising solution    
Location Thailand    
Controlling percentage ownership 99.90% 99.90%  
Closing month December    
KT Huimangjieum [member]      
Disclosure of subsidiaries [line items]      
Subsidiary KT Huimangjieum    
Total assets ₩ 2,129    
Type of Business Manufacturing    
Total liabilities ₩ 1,019    
Location Korea    
Operating revenues ₩ 1,027    
Profit (loss) for the year ₩ (390)    
Closing month December    
GE Premier 1st Corporate Restructuring Real Estate Investment Trust Co. [member]      
Disclosure of subsidiaries [line items]      
Subsidiary GE Premier 1st Corporate Restructuring Real Estate Investment Trust Co.    
Total assets ₩ 6,285    
Type of Business Residential building investment and rent    
Total liabilities ₩ 1,139    
Location Korea    
Operating revenues ₩ 176    
Controlling percentage ownership 63.50%    
Profit (loss) for the year ₩ 70    
Closing month December    
K-REALTY RENTAL HOUSING REIT 3 [member]      
Disclosure of subsidiaries [line items]      
Subsidiary K-REALTY RENTAL HOUSING REIT 3    
Total assets ₩ 300    
Type of Business Residential building    
Location Korea    
Closing month December