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General Information - Summary of Consolidated Subsidiaries (Detail) - KRW (₩) ₩ in Millions | 12 Months Ended
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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 |  |

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