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General Information - Summary of Consolidated Subsidiaries (Detail) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of subsidiaries [line items] |  |  |
Total assets | ₩ 37,159,341 | ₩ 33,662,545 |
Total liabilities | 20,592,180 | 18,111,112 |
Operating revenues | 25,205,659 | 24,440,647 | ₩ 24,899,189
Profit (loss) for the year | ₩ 1,459,395 | ₩ 746,256 | ₩ 695,868
KT Powertel Co., Ltd. [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary |  | KT Powertel Co., Ltd. | KT Powertel Co., Ltd.
Total assets |  | ₩ 119,694 | ₩ 118,052
Total liabilities |  | 18,833 | 19,766
Operating revenues |  | 65,897 | 62,846
Profit (loss) for the year |  | ₩ 3,809 | ₩ 3,085
KT Linkus Inc. [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT Linkus Inc. | KT Linkus Inc. | KT Linkus Inc.
Total assets | ₩ 54,219 | ₩ 58,372 | ₩ 70,494
Type of Business | Public telephone maintenance |  |
Total liabilities | ₩ 53,316 | 54,022 | 62,088
Location | Korea |  |
Operating revenues | ₩ 81,434 | ₩ 84,519 | 97,892
Controlling percentage ownership | 92.40% | 92.40% |
Profit (loss) for the year | ₩ (3,095) | ₩ (3,212) | ₩ (2,258)
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 | ₩ 110,390 | ₩ 116,813 | ₩ 120,947
Type of Business | Submarine cable construction and maintenance |  |
Total liabilities | ₩ 10,736 | 14,032 | 18,452
Location | Korea |  |
Operating revenues | ₩ 31,374 | ₩ 110,201 | 55,244
Controlling percentage ownership | 39.30% | 39.30% |
Profit (loss) for the year | ₩ (3,183) | ₩ 1,197 | ₩ 486
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 | ₩ 363,224 | ₩ 318,456 | ₩ 279,878
Type of Business | Security service |  |
Total liabilities | ₩ 233,797 | 193,737 | 153,841
Location | Korea |  |
Operating revenues | ₩ 515,456 | ₩ 392,489 | 332,063
Controlling percentage ownership | 86.80% | 86.80% |
Profit (loss) for the year | ₩ 3,985 | ₩ 212 | ₩ (4,875)
Closing month | December |  |
KT Hitel Co., Ltd. [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary |  | KT Alpha Co., Ltd. (KT Hitel Co., Ltd.) | KT Alpha Co., Ltd. (KT Hitel Co., Ltd.)
Total assets |  | ₩ 288,949 | ₩ 279,818
Total liabilities |  | 92,599 | 74,769
Operating revenues |  | 350,231 | 323,065
Profit (loss) for the year |  | ₩ 2,080 | ₩ 1,426
KT service bukbu Inc. [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT Service Bukbu Inc. | KT Service Bukbu Inc. | KT Service Bukbu Inc.
Total assets | ₩ 59,341 | ₩ 60,825 | ₩ 64,802
Type of Business | Opening services of fixed line |  |
Total liabilities | ₩ 54,070 | 56,554 | 58,984
Location | Korea |  |
Operating revenues | ₩ 231,602 | ₩ 217,451 | 219,427
Controlling percentage ownership | 67.30% | 67.30% |
Profit (loss) for the year | ₩ 1,128 | ₩ (871) | ₩ (445)
Closing month | December |  |
KT service nambu Inc. [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT Service Nambu Inc. | KT Service Nambu Inc. | KT Service Nambu Inc.
Total assets | ₩ 62,513 | ₩ 58,182 | ₩ 63,917
Type of Business | Opening services of fixed line |  |
Total liabilities | ₩ 52,695 | 51,460 | 55,548
Location | Korea |  |
Operating revenues | ₩ 271,174 | ₩ 264,776 | 266,148
Controlling percentage ownership | 77.30% | 77.30% |
Profit (loss) for the year | ₩ 1,430 | ₩ (456) | ₩ 280
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% | 100.00% |
Closing month | December |  |
BCVP Strategic Investment Fund No. 1 [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 | ₩ 3,933,427 | ₩ 3,084,398 | ₩ 3,912,982
Type of Business | Credit card business |  |
Total liabilities | ₩ 2,481,004 | 1,778,751 | 2,594,232
Location | Korea |  |
Operating revenues | ₩ 3,580,970 | ₩ 3,387,640 | 3,553,008
Controlling percentage ownership | 69.50% | 69.50% |
Profit (loss) for the year | ₩ 120,308 | ₩ 39,455 | ₩ 115,885
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 Co.,Ltd. [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | H&C Network Co., Ltd. | H&C Network | H&C Network Co. Ltd.
Total assets | ₩ 88,616 | ₩ 269,651 | ₩ 282,016
Type of Business | Call center for financial sectors |  |
Total liabilities | ₩ 4,993 | 61,365 | 68,401
Location | Korea |  |
Operating revenues | ₩ 227,604 | ₩ 322,690 | 320,701
Controlling percentage ownership | 100.00% | 100.00% |
Profit (loss) for the year | ₩ 11,995 | ₩ 2,413 | ₩ (1,593)
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% | 64.50% |
Closing month | December |  |
KTDS Co., Ltd. [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KTDS Co., Ltd. | KTDS Co., Ltd. | KTDS Co., Ltd.
Total assets | ₩ 341,358 | ₩ 183,297 | ₩ 158,153
Type of Business | System integration and maintenance |  |
Total liabilities | ₩ 199,831 | 133,129 | 105,462
Location | Korea |  |
Operating revenues | ₩ 632,899 | ₩ 499,990 | 428,758
Controlling percentage ownership | 95.50% | 95.50% |
Profit (loss) for the year | ₩ 21,464 | ₩ 10,635 | ₩ 9,027
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.
Total assets |  | ₩ 104,704 | ₩ 74,326
Total liabilities |  | 76,315 | 50,638
Operating revenues |  | 44,860 | 33,443
Profit (loss) for the year |  | ₩ 6,935 | ₩ 6,771
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 | ₩ 241,377 | ₩ 231,260 | ₩ 248,142
Type of Business | PCS distribution |  |
Total liabilities | ₩ 203,051 | 197,306 | 215,777
Location | Korea |  |
Operating revenues | ₩ 710,634 | ₩ 661,533 | 813,498
Controlling percentage ownership | 100.00% | 100.00% |
Profit (loss) for the year | ₩ 3,496 | ₩ (485) | ₩ 12,732
Closing month | December |  |
GENIE Music Corporation K T Music Corporation [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary |  |  | GENIE Music Corporation
Total assets |  | 250,538 | ₩ 234,131
Total liabilities |  | 88,488 | 80,952
Operating revenues |  | 247,237 | 230,480
Profit (loss) for the year |  | ₩ 9,472 | ₩ 7,658
KT MOS Bukbu Co.,Ltd. [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT MOS Bukbu Co., Ltd. | KT MOS Bukbu Co., Ltd. | KT MOS Bukbu Inc.
Total assets | ₩ 32,511 | ₩ 32,167 | ₩ 33,376
Type of Business | Telecommunication facility maintenance |  |
Total liabilities | ₩ 25,402 | 26,070 | 28,841
Location | Korea |  |
Operating revenues | ₩ 70,212 | ₩ 67,975 | 63,761
Controlling percentage ownership | 100.00% | 100.00% |
Profit (loss) for the year | ₩ 1,637 | ₩ 1,473 | ₩ 353
Closing month | December |  |
KTMOS Nambu Co.,Ltd. [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT MOS Nambu Co., Ltd. | KT MOS Nambu Co., Ltd. | KT MOS Nambu Inc.
Total assets | ₩ 36,741 | ₩ 33,765 | ₩ 34,258
Type of Business | Telecommunication facility maintenance |  |
Total liabilities | ₩ 26,053 | 24,947 | 26,722
Location | Korea |  |
Operating revenues | ₩ 71,940 | ₩ 71,259 | 67,300
Controlling percentage ownership | 98.40% | 98.40% |
Profit (loss) for the year | ₩ 2,016 | ₩ 1,639 | ₩ 3,099
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 | ₩ 1,275,645 | ₩ 919,476 | ₩ 848,276
Total liabilities | 469,694 | 175,039 | 142,839
Operating revenues | 772,950 | 706,631 | 704,996
Profit (loss) for the year | ₩ 62,309 | ₩ 58,190 | ₩ 56,008
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 | 100.00% | 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 | ₩ 2,370,940 | ₩ 1,689,601 | ₩ 1,686,000
Type of Business | Residential building development and supply |  |
Total liabilities | ₩ 791,884 | 325,429 | 295,706
Location | Korea |  |
Operating revenues | ₩ 577,578 | ₩ 365,335 | 485,686
Controlling percentage ownership | 100.00% | 100.00% |
Profit (loss) for the year | ₩ 213,203 | ₩ 14,370 | ₩ 48,552
Closing month | December |  |
KT AMC Inc. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT AMC Inc. |  |
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 | KT 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)
Total assets |  | ₩ 11,003 | ₩ 10,437
Total liabilities |  | 1,669 | 1,628
Operating revenues |  | 4,282 | 3,977
Profit (loss) for the year |  | ₩ 538 | ₩ 344
KT Sat Inc. [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT Sat Inc. | KT Sat Inc. | KT Sat Inc.
Total assets | ₩ 593,616 | ₩ 630,740 | ₩ 651,195
Type of Business | Satellite communication business |  |
Total liabilities | ₩ 34,169 | 92,791 | 127,523
Location | Korea |  |
Operating revenues | ₩ 174,750 | ₩ 173,693 | 168,376
Controlling percentage ownership | 100.00% | 100.00% |
Profit (loss) for the year | ₩ 20,830 | ₩ 14,753 | ₩ 16,497
Closing month | December |  |
Nasmedia Co Ltd [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | Nasmedia Co., Ltd. | Nasmedia Co., Ltd. | Nasmedia Co., Ltd.
Total assets | ₩ 490,394 | ₩ 422,039 | ₩ 356,236
Total liabilities | 268,618 | 221,371 | 203,105
Operating revenues | 125,876 | 113,136 | 117,550
Profit (loss) for the year | ₩ 27,120 | ₩ 23,134 | ₩ 22,484
KT Sports Inc [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT Sports Inc. | KT Sports Inc. | KT Sports Inc.
Total assets | ₩ 29,524 | ₩ 26,572 | ₩ 15,603
Type of Business | Management of sports group |  |
Total liabilities | ₩ 19,740 | 14,940 | 8,333
Location | Korea |  |
Operating revenues | ₩ 67,612 | ₩ 46,608 | 55,241
Controlling percentage ownership | 100.00% | 100.00% |
Profit (loss) for the year | ₩ (2,039) | ₩ (2,516) | ₩ (464)
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
Total assets |  | ₩ 4,844 | ₩ 10,579
Total liabilities |  | 1,525 | 1,677
Operating revenues |  | 243 | 521
Profit (loss) for the year |  | ₩ 84 | ₩ 345
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 | ₩ 14,985 | ₩ 15,021 | ₩ 7,675
Type of Business | Music contents investment business |  |
Total liabilities | ₩ 278 | 285 | 279
Location | Korea |  |
Operating revenues | ₩ 253 | ₩ 169 | 331
Controlling percentage ownership | 100.00% | 100.00% |
Profit (loss) for the year | ₩ (30) | ₩ (116) | ₩ 48
Closing month | December |  |
KT-Michigan global contents fund [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT-Michigan Global Contents Fund | KT-Michigan Global Contents Fund | KT-Michigan Global Content Fund
Total assets | ₩ 3,552 | ₩ 10,382 | ₩ 11,688
Type of Business | Content investment business |  |
Total liabilities | ₩ 112 | 175 | 61
Location | Korea |  |
Operating revenues | ₩ 13,592 | ₩ 111 | 248
Controlling percentage ownership | 88.60% | 88.60% |
Profit (loss) for the year | ₩ 10,032 | ₩ (1,420) | ₩ (1,113)
Closing month | December |  |
Autopion Co., Ltd. [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary |  | Autopion Co., Ltd. | Autopion Co., Ltd.
Total assets |  | ₩ 4,903 | ₩ 7,460
Total liabilities |  | 4,961 | 4,894
Operating revenues |  | 6,174 | 5,604
Profit (loss) for the year |  | ₩ (2,459) | ₩ (302)
KTCS Corporation [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KTCS Corporation | KTCS Corporation | KTCS Corporation
Total assets | ₩ 416,750 | ₩ 384,919 | ₩ 378,171
Type of Business | Database and online information provider |  |
Total liabilities | ₩ 234,172 | 215,175 | 213,983
Location | Korea |  |
Operating revenues | ₩ 968,499 | ₩ 933,006 | 944,778
Controlling percentage ownership | 32.20% | 31.90% |
Profit (loss) for the year | ₩ 19,034 | ₩ 11,323 | ₩ 7,597
Closing month | December |  |
KTIS Corporation [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KTIS Corporation | KTIS Corporation | KTIS Corporation
Total assets | ₩ 369,361 | ₩ 294,289 | ₩ 305,798
Type of Business | Database and online information provider |  |
Total liabilities | ₩ 177,619 | 126,894 | 137,524
Location | Korea |  |
Operating revenues | ₩ 487,801 | ₩ 454,172 | 454,561
Controlling percentage ownership | 31.40% | 30.80% |
Profit (loss) for the year | ₩ 24,944 | ₩ 7,387 | ₩ 9,205
Closing month | December |  |
KT M mobile Inc. [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT M Mobile Inc. | KT M Mobile Inc. | KT M mobile Inc.
Total assets | ₩ 144,175 | ₩ 129,011 | ₩ 135,917
Type of Business | Special category telecommunications operator and sales of communication device |  |
Total liabilities | ₩ 40,749 | 27,281 | 30,603
Location | Korea |  |
Operating revenues | ₩ 204,641 | ₩ 163,472 | 161,720
Controlling percentage ownership | 100.00% | 100.00% |
Profit (loss) for the year | ₩ 5,918 | ₩ (3,617) | ₩ (5,580)
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 | ₩ 87,366 | ₩ 115,627 | ₩ 73,463
Type of Business | Technology business finance |  |
Total liabilities | ₩ 66,108 | 93,695 | 56,212
Location | Korea |  |
Operating revenues | ₩ 21,040 | ₩ 47,801 | 13,375
Controlling percentage ownership | 100.00% | 100.00% |
Profit (loss) for the year | ₩ (697) | ₩ 4,680 | ₩ 847
Closing month | December |  |
Whowho&Company Ltd. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | Whowho&Company., Ltd. |  |
Type of Business | Software development and supply |  |
Location | Korea |  |
Controlling percentage ownership | 100.00% | 100.00% |
Closing month | December |  |
Next Connect PFV Inc[member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | Next Connect PFV Inc. | Next Connect PFV Inc. | Next connect PFV Inc.
Total assets | ₩ 518,441 | ₩ 394,268 | ₩ 385,412
Type of Business | Residential building development and supply |  |
Total liabilities | ₩ 167,963 | 37,271 | 24,275
Location | Korea |  |
Operating revenues | ₩ 0 | ₩ 26 | 1,590
Controlling percentage ownership | 100.00% | 100.00% |
Profit (loss) for the year | ₩ (6,519) | ₩ (7,101) | ₩ (5,898)
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 | ₩ 125,860 | ₩ 114,768 | ₩ 132,461
Type of Business | Network installation and management |  |
Total liabilities | ₩ 236,389 | 191,781 | 183,164
Location | Rwanda |  |
Operating revenues | ₩ 23,328 | ₩ 17,870 | 18,013
Controlling percentage ownership | 51.00% | 51.00% |
Profit (loss) for the year | ₩ (28,770) | ₩ (34,610) | ₩ (31,662)
Closing month | December |  |
AOS Ltd. [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | AOS Ltd. | AOS Ltd. | AOS Ltd.
Total assets | ₩ 11,539 | ₩ 11,812 | ₩ 12,337
Type of Business | System integration and maintenance |  |
Total liabilities | ₩ 2,812 | 3,875 | 3,993
Location | Rwanda |  |
Operating revenues | ₩ 6,942 | ₩ 5,719 | 6,982
Controlling percentage ownership | 51.00% | 51.00% |
Profit (loss) for the year | ₩ 823 | ₩ 296 | ₩ (591)
Closing month | December |  |
KT Belgium [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary |  | KT Belgium | KT Belgium
Total assets |  | ₩ 87,608 | ₩ 93,321
Total liabilities |  | 0 | 11
Operating revenues |  | (81) |
Profit (loss) for the year |  | ₩ (81) | ₩ (64)
KT ORS Belgium [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary |  |  | KT ORS Belgium
Total assets |  |  | ₩ 6,913
Total liabilities |  |  | 14
Profit (loss) for the year |  |  | ₩ (43)
Korea Telecom China Co., Ltd. [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary |  | Korea Telecom China Co., Ltd. | Korea Telecom China Co., Ltd.
Total assets |  | ₩ 381 | ₩ 879
Total liabilities |  | 21 | 39
Operating revenues |  | 618 | 844
Profit (loss) for the year |  | ₩ (492) | ₩ 192
KT Japan Co., Ltd. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT Japan Co., Ltd. | KT Japan Co., Ltd. | KT Japan Co., Ltd.
Total assets | ₩ 1,474 | ₩ 2,694 | ₩ 1,851
Type of Business | Foreign telecommunication business |  |
Total liabilities | ₩ 2,633 | 2,622 | 2,858
Location | Japan |  |
Operating revenues | ₩ 1,298 | ₩ 1,853 | 2,891
Controlling percentage ownership | 100.00% | 100.00% |
Profit (loss) for the year | ₩ (142) | ₩ 1 | ₩ 651
Closing month | December |  |
KBTO sp.zo.o. [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary |  | KBTO sp.z o.o. | KBTO sp.zo.o.
Total assets |  | ₩ 438 | ₩ 1,767
Total liabilities |  | 117 | 245
Operating revenues |  | 490 | 519
Profit (loss) for the year |  | ₩ (2,823) | ₩ (3,457)
KT America, Inc. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT America, Inc. | KT AMERICA, INC | KT AMERICA, INC
Total assets | ₩ 4,884 | ₩ 4,498 | ₩ 4,611
Type of Business | Foreign investment business |  |
Total liabilities | ₩ 101 | 125 | 537
Location | USA |  |
Operating revenues | ₩ 6,508 | ₩ 6,808 | 6,808
Controlling percentage ownership | 100.00% | 100.00% |
Profit (loss) for the year | ₩ 201 | ₩ 712 | ₩ 572
Closing month | December |  |
KT Dutch B.V. [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary |  | KT Dutch B.V. | KT Dutch B.V.
Total assets |  | ₩ 29,585 | ₩ 31,003
Total liabilities |  | 10,109 | 50
Operating revenues |  | 26,782 |
Profit (loss) for the year |  | ₩ 6,061 | ₩ (242)
Super iMax LLC [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary |  |  | Super iMax LLC
Total assets |  |  | ₩ 3,568
Total liabilities |  |  | 5,304
Operating revenues |  |  | 4,604
Profit (loss) for the year |  |  | ₩ (631)
East Telecom LLC [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | East Telecom LLC |  | East Telecom LLC
Total assets | ₩ 35,904 |  | ₩ 20,857
Type of Business | Fixed line internet business |  |
Total liabilities | ₩ 22,088 |  | 16,302
Location | Uzbekistan |  |
Operating revenues | ₩ 11,960 |  | 17,186
Controlling percentage ownership | 91.60% | 91.60% |
Profit (loss) for the year | ₩ 2,487 |  | ₩ 2,140
Closing month | December |  |
PT. KT Indonesia [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary |  |  | PT. KT Indonesia
Total assets |  |  | ₩ 8
Total liabilities |  |  | ₩ 0
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 Hong Kong Telecommunications Co., Ltd. | KT Hong Kong Telecommunications Co., Ltd. | KT Hongkong Telecommunications Co., Ltd.
Total assets | ₩ 6,613 | ₩ 6,159 | ₩ 5,126
Type of Business | Fixed line telecommunication business |  |
Total liabilities | ₩ 1,346 | 2,800 | 2,923
Location | Hong Kong |  |
Operating revenues | ₩ 18,825 | ₩ 16,386 | 13,321
Controlling percentage ownership | 100.00% | 100.00% |
Profit (loss) for the year | ₩ 1,313 | ₩ 1,308 | ₩ 586
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 LLC |  |
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 Hopemate [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT Hopemate | KT Hopemate | KT Hopemate
Total assets | ₩ 6,311 | ₩ 3,720 | ₩ 2,129
Type of Business | Manufacturing |  |
Total liabilities | ₩ 2,978 | 2,787 | 1,019
Location | Korea |  |
Operating revenues | ₩ 12,538 | ₩ 5,239 | 1,027
Controlling percentage ownership | 100.00% | 100.00% |
Profit (loss) for the year | ₩ 116 | ₩ (13) | ₩ (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. | GE Premier 1st Corporate Restructuring Real Estate Investment Trust Co.
Total assets |  | ₩ 5,703 | ₩ 6,285
Total liabilities |  | 1,165 | 1,139
Operating revenues |  | 333 | 176
Profit (loss) for the year |  | ₩ 83 | ₩ 70
K-REALTY RENTAL HOUSING REIT 3 [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | K-REALTY RENTAL HOUSING REIT 3 |  | K-REALTY RENTAL HOUSING REIT 3
Total assets |  |  | ₩ 300
Type of Business | Residential building |  |
Location | Korea |  |
Controlling percentage ownership | 88.60% | 88.60% |
Closing month | December |  |
GENIE Music Corporation(KT Music Corporation) [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary |  | GENIE Music Corporation |
Storywiz Co Ltd [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary |  | Storywiz Co., Ltd |
Total assets |  | ₩ 21,594 |
Total liabilities |  | 10,065 |
Operating revenues |  | 19,209 |
Profit (loss) for the year |  | ₩ (1,954) |
KT Engineering Co Ltd KT ENGCORE Co Ltd [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT Engineering Co., Ltd. (KT ENGCORE Co., Ltd.) | KT Engineering Co., Ltd. (KT ENGCORE Co., Ltd.) |
Total assets | ₩ 185,850 | ₩ 138,220 |
Type of Business | Telecommunication facility construction and maintenance |  |
Total liabilities | ₩ 144,832 | 102,963 |
Location | Korea |  |
Operating revenues | ₩ 284,998 | ₩ 346,040 |
Controlling percentage ownership | 100.00% | 100.00% |
Profit (loss) for the year | ₩ 366 | ₩ (8,461) |
Closing month | December |  |
KT Alpha Co., Ltd. (KT Hitel Co., Ltd.) [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT Alpha Co., Ltd. (KT Hitel Co., Ltd.) |  |
Total assets | ₩ 390,671 |  |
Type of Business | Data communication |  |
Total liabilities | ₩ 172,767 |  |
Location | Korea |  |
Operating revenues | ₩ 471,870 |  |
Controlling percentage ownership | 73.00% | 67.10% |
Profit (loss) for the year | ₩ (8,692) |  |
Closing month | December |  |
GENIE Music Corporation [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | GENIE Music Corporation |  |
Type of Business | Online music production and distribution |  |
Location | Korea |  |
Controlling percentage ownership | 36.20% | 36.20% |
Closing month | December |  |
KT Skylife [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT Skylife Co., Ltd. |  |
Type of Business | Satellite TV |  |
Location | Korea |  |
Controlling percentage ownership | 50.30% | 50.30% |
Closing month | December |  |
KTGDH Co., Ltd. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KTGDH Co., Ltd. |  |
Total assets | ₩ 11,464 |  |
Type of Business | Data center development and related service |  |
Total liabilities | ₩ 1,560 |  |
Location | Korea |  |
Operating revenues | ₩ 4,423 |  |
Controlling percentage ownership | 100.00% | 100.00% |
Profit (loss) for the year | ₩ 553 |  |
Closing month | December |  |
Nasmedia, Co., Ltd. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | Nasmedia, Co., Ltd. |  |
Type of Business | Solution provider and IPTV advertisement sales business |  |
Location | Korea |  |
Controlling percentage ownership | 44.00% | 44.00% |
Closing month | December |  |
PlayD Co., Ltd. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | PlayD Co., Ltd. |  |
Type of Business | Advertising agency |  |
Location | Korea |  |
Controlling percentage ownership | 70.40% | 70.40% |
Closing month | December |  |
Storywiz [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | Storywiz Co., Ltd. |  |
Type of Business | Contents and software development and supply |  |
Location | Korea |  |
Controlling percentage ownership | 100.00% | 100.00% |
Closing month | December |  |
KT Studio Genie Co Ltd [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT Studio Genie Co., Ltd. |  |
Total assets | ₩ 648,534 |  |
Type of Business | Data communication service and data communication construction business |  |
Total liabilities | ₩ 276,933 |  |
Location | Korea |  |
Operating revenues | ₩ 90,047 |  |
Controlling percentage ownership | 100.00% |  |
Profit (loss) for the year | ₩ (16,443) |  |
Closing month | December |  |
KHS Corporation [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KHS Corporation |  |
Type of Business | Operation and maintenance of facilities |  |
Location | Korea |  |
Controlling percentage ownership | 100.00% |  |
Closing month | December |  |
Lolab Co Ltd [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | Lolab Co., Ltd. |  |
Total assets | ₩ 26,726 |  |
Type of Business | Truck transportation and trucking arrangement business |  |
Total liabilities | ₩ 897 |  |
Location | Korea |  |
Operating revenues | ₩ 2,107 |  |
Controlling percentage ownership | 80.00% |  |
Profit (loss) for the year | ₩ (134) |  |
Closing month | December |  |
HCN Co Ltd [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | HCN Co., Ltd. |  |
Type of Business | Cable television service |  |
Location | Korea |  |
Controlling percentage ownership | 100.00% |  |
Closing month | December |  |
MEDIA GENIE Co Ltd [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | MEDIA GENIE Co., Ltd. |  |
Type of Business | TV contents provider |  |
Location | Korea |  |
Controlling percentage ownership | 100.00% |  |
Closing month | December |  |
KT Seezn Co Ltd [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT Seezn Co., Ltd. |  |
Type of Business | Movies, videos and TV contents production and distribution |  |
Location | Korea |  |
Controlling percentage ownership | 100.00% |  |
Closing month | December |  |
BOOK CLUB MILLIE [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | BOOK CLUB MILLIE |  |
Type of Business | Book contents service |  |
Location | Korea |  |
Controlling percentage ownership | 38.60% |  |
Closing month | December |  |
KT ES Pte Ltd [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT ES Pte. Ltd. |  |
Total assets | ₩ 240,331 |  |
Type of Business | Foreign investment business |  |
Total liabilities | ₩ 80,597 |  |
Location | Singapore |  |
Operating revenues | ₩ 15,157 |  |
Controlling percentage ownership | 57.60% |  |
Profit (loss) for the year | ₩ (6,355) |  |
Closing month | December |  |
Epsilon Global Communications [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | Epsilon Global Communications Pte. Ltd. |  |
Type of Business | Network service industry |  |
Location | Singapore |  |
Controlling percentage ownership | 100.00% |  |
Closing month | December |  |
Epsilon Telecommunications [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | Epsilon Telecommunications (SP) Pte. Ltd. |  |
Type of Business | Fixed line telecommunication business |  |
Location | Singapore |  |
Controlling percentage ownership | 100.00% |  |
Closing month | December |  |
Epsilon Telecommunications US Pte Ltd [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | Epsilon Telecommunications (US) Pte. Ltd. |  |
Type of Business | Fixed line telecommunication business |  |
Location | Singapore |  |
Controlling percentage ownership | 100.00% |  |
Closing month | December |  |
Epsilon Telecommunications Limited [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | Epsilon Telecommunications Limited |  |
Type of Business | Fixed line telecommunication business |  |
Location | UK |  |
Controlling percentage ownership | 100.00% |  |
Closing month | December |  |
7 D Digital Limited [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | 7D Digital Limited |  |
Type of Business | Software development |  |
Location | UK |  |
Controlling percentage ownership | 100.00% |  |
Closing month | December |  |
Epsilon Telecommunications HK Limited [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | Epsilon Telecommunications (HK) Limited |  |
Type of Business | Fixed line telecommunication business |  |
Location | Hong kong |  |
Controlling percentage ownership | 100.00% |  |
Closing month | December |  |
Epsilon US Inc [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | Epsilon US Inc. |  |
Type of Business | Fixed line telecommunication business |  |
Location | USA |  |
Controlling percentage ownership | 100.00% |  |
Closing month | December |  |
Epsilon Telecommunications BG EOOD [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | Epsilon Telecommunications (BG) EOOD |  |
Type of Business | Employee support service |  |
Location | Bulgaria |  |
Controlling percentage ownership | 100.00% |  |
Closing month | December |  |
Epsilon M E A General Trading LLC [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | Epsilon M E A General Trading LLC |  |
Type of Business | Local counter work |  |
Location | Dubai |  |
Controlling percentage ownership | 49.00% |  |
Closing month | December |  |
Nasmedia KTAlpha Future Growth Strategic Investment Fund [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | Nasmedia-KT Alpha Future Growth Strategic Investment Fund |  |
Type of Business | Investment fund |  |
Location | Korea |  |
Controlling percentage ownership | 100.00% |  |
Closing month | December |  |
KT Strategic Investment Fund [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT Strategic Investment Fund 6 |  |
Type of Business | Investment fund |  |
Location | Korea |  |
Controlling percentage ownership | 100.00% |  |
Closing month | December |  |
Altimedia Corporation [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | Altimedia Corporation |  |
Total assets | ₩ 32,338 |  |
Type of Business | Software development and delivery |  |
Total liabilities | ₩ 9,742 |  |
Location | Korea |  |
Operating revenues | ₩ 6,968 |  |
Controlling percentage ownership | 100.00% |  |
Profit (loss) for the year | ₩ 1,037 |  |
Closing month | December |  |
Alticast B V [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | Alticast B.V. |  |
Type of Business | Software development and delivery |  |
Location | Netherlands |  |
Controlling percentage ownership | 100.00% |  |
Closing month | December |  |
Alticast Company Limited [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | Alticast Company Limited |  |
Type of Business | Software development and delivery |  |
Location | Vietnam |  |
Controlling percentage ownership | 100.00% |  |
Closing month | December |  |
Wirecard Vietnam Company Limited [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | Wirecard (Vietnam) Company Limited |  |
Type of Business | Software sales business |  |
Location | Vietnam |  |
Controlling percentage ownership | 100.00% |  |
Closing month | December |  |
KT Philippines [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT Philippines |  |
Total assets | ₩ 3,641 |  |
Type of Business | Fixed line telecommunication business |  |
Total liabilities | ₩ 1,243 |  |
Location | Philippines |  |
Operating revenues | ₩ 0 |  |
Controlling percentage ownership | 100.00% | 40.00% |
Profit (loss) for the year | ₩ 0 |  |
Closing month | December |  |

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