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General Information - Summary of Consolidated Subsidiaries (Detail) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disclosure of subsidiaries [line items] |  |  |
Total assets | ₩ 40,989,810 | ₩ 37,159,341 |
Total liabilities | 22,577,114 | 20,592,180 |
Operating revenues | 25,638,855 | 24,898,005 | ₩ 24,099,394
Profit (loss) for the year | ₩ 1,385,635 | ₩ 1,459,395 | ₩ 746,256
KT Linkus Co., Ltd [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT Linkus Co., Ltd. | KT Linkus Co., Ltd | KT Linkus Co., Ltd.
Type of Business | Public telephone maintenance |  |
Location | Korea |  |
Controlling percentage ownership | 92.40% | 92.40% |
Closing month | December |  |
Total assets | ₩ 47,734 |  |
Total liabilities | 47,498 |  |
Operating revenues | 76,135 |  |
Profit (loss) for the year | ₩ (614) |  |
KT Submarine Co., Ltd. [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT Submarine Co., Ltd. | KT Submarine Co., Ltd. | KT Submarine Co., Ltd.
Type of Business | Submarine cable construction and maintenance |  |
Location | Korea |  |
Controlling percentage ownership | 32.90% | 39.30% |
Closing month | December |  |
Total assets | ₩ 120,255 | ₩ 110,390 | ₩ 116,813
Total liabilities | 7,884 | 10,736 | 14,032
Operating revenues | 42,848 | 31,374 | 110,201
Profit (loss) for the year | ₩ (12,126) | ₩ (3,183) | ₩ 1,197
KT Telecop Co., Ltd. [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT Telecop Co., Ltd. | KT Telecop Co., Ltd. | KT Telecop Co., Ltd.
Type of Business | Security service |  |
Location | Korea |  |
Controlling percentage ownership | 86.80% | 86.80% |
Closing month | December |  |
Total assets | ₩ 370,004 | ₩ 363,224 | ₩ 318,456
Total liabilities | 230,965 | 233,797 | 193,737
Operating revenues | 517,406 | 515,456 | 392,489
Profit (loss) for the year | ₩ 4,267 | ₩ 3,985 | ₩ 212
KT Alpha Co., Ltd. (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.) | KT Alpha Co., Ltd. (KT Hitel Co., Ltd.)
Type of Business | Data communication |  |
Location | Korea |  |
Controlling percentage ownership | 73.00% | 73.00% |
Closing month | December |  |
Total assets | ₩ 406,236 | ₩ 390,671 | ₩ 288,949
Total liabilities | 172,211 | 172,767 | 92,599
Operating revenues | 516,737 | 471,870 | 350,231
Profit (loss) for the year | ₩ 13,115 | ₩ (8,692) | ₩ 2,080
KT Service Bukbu Co., Ltd. [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT Service Bukbu Co., Ltd. | KT Service Bukbu Inc. | KT Service Bukbu Inc.
Type of Business | Opening services of fixed line |  |
Location | Korea |  |
Controlling percentage ownership | 67.30% | 67.30% |
Closing month | December |  |
Total assets | ₩ 74,673 | ₩ 59,341 | ₩ 60,825
Total liabilities | 65,820 | 54,070 | 56,554
Operating revenues | 252,304 | 231,602 | 217,451
Profit (loss) for the year | ₩ 3,227 | ₩ 1,128 | ₩ (871)
KT Service Nambu Co., Ltd. [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT Service Nambu Co., Ltd. | KT Service Nambu Inc. | KT Service Nambu Inc.
Type of Business | Opening services of fixed line |  |
Location | Korea |  |
Controlling percentage ownership | 77.30% | 77.30% |
Closing month | December |  |
Total assets | ₩ 80,450 | ₩ 62,513 | ₩ 58,182
Total liabilities | 66,479 | 52,695 | 51,460
Operating revenues | 301,720 | 271,174 | 264,776
Profit (loss) for the year | ₩ 3,067 | ₩ 1,430 | ₩ (456)
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 |  |
BC-VP 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.
Type of Business | Credit card business |  |
Location | Korea |  |
Controlling percentage ownership | 69.50% | 69.50% |
Closing month | December |  |
Total assets | ₩ 5,666,075 | ₩ 3,933,427 | ₩ 3,084,398
Total liabilities | 4,109,200 | 2,481,004 | 1,778,751
Operating revenues | 3,897,090 | 3,580,970 | 3,387,640
Profit (loss) for the year | ₩ 148,341 | ₩ 120,308 | ₩ 39,455
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 | 69.70% | 50.90% |
Closing month | December |  |
H&C Network [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | H&C Network | H&C Network Co., Ltd. | H&C Network
Type of Business | Call center for financial sectors |  |
Location | Korea |  |
Controlling percentage ownership | 100.00% | 100.00% |
Closing month | December |  |
Total assets | ₩ 82,737 | ₩ 88,616 | ₩ 269,651
Total liabilities | 6,640 | 4,993 | 61,365
Operating revenues | 27,392 | 227,604 | 322,690
Profit (loss) for the year | ₩ 992 | ₩ 11,995 | ₩ 2,413
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 | 61.30% | 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.
Type of Business | System integration and maintenance |  |
Location | Korea |  |
Controlling percentage ownership | 95.60% | 95.50% |
Closing month | December |  |
Total assets | ₩ 401,932 | ₩ 341,358 | ₩ 183,297
Total liabilities | 228,474 | 199,831 | 133,129
Operating revenues | 723,161 | 632,899 | 499,990
Profit (loss) for the year | ₩ 30,941 | ₩ 21,464 | ₩ 10,635
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.
Type of Business | PCS distribution |  |
Location | Korea |  |
Controlling percentage ownership | 100.00% | 100.00% |
Closing month | December |  |
Total assets | ₩ 255,310 | ₩ 241,377 | ₩ 231,260
Total liabilities | 204,336 | 203,051 | 197,306
Operating revenues | 730,802 | 710,634 | 661,533
Profit (loss) for the year | ₩ 8,105 | ₩ 3,496 | ₩ (485)
GENIE Music Corporation [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | GENIE Music Corporation |  | GENIE Music Corporation
Type of Business | Online music production and distribution |  |
Location | Korea |  |
Controlling percentage ownership | 36.00% | 36.20% |
Closing month | December |  |
Total assets |  |  | ₩ 250,538
Total liabilities |  |  | 88,488
Operating revenues |  |  | 247,237
Profit (loss) for the year |  |  | ₩ 9,472
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 Co., Ltd.
Type of Business | Telecommunication facility maintenance |  |
Location | Korea |  |
Controlling percentage ownership | 100.00% | 100.00% |
Closing month | December |  |
Total assets | ₩ 38,684 | ₩ 32,511 | ₩ 32,167
Total liabilities | 22,553 | 25,402 | 26,070
Operating revenues | 83,085 | 70,212 | 67,975
Profit (loss) for the year | ₩ 4,607 | ₩ 1,637 | ₩ 1,473
KT MOS Nambu Co., Ltd [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT MOS Nambu Co., Ltd. | KT MOS Nambu Co., Ltd. | KT MOS Nambu Co., Ltd.
Type of Business | Telecommunication facility maintenance |  |
Location | Korea |  |
Controlling percentage ownership | 98.40% | 98.40% |
Closing month | December |  |
Total assets | ₩ 42,011 | ₩ 36,741 | ₩ 33,765
Total liabilities | 25,416 | 26,053 | 24,947
Operating revenues | 83,330 | 71,940 | 71,259
Profit (loss) for the year | ₩ 5,035 | ₩ 2,016 | ₩ 1,639
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 | ₩ 1,359,166 | ₩ 1,275,645 | ₩ 919,476
Total liabilities | 503,679 | 469,694 | 175,039
Operating revenues | 1,038,468 | 772,950 | 706,631
Profit (loss) for the year | ₩ 20,941 | ₩ 62,309 | ₩ 58,190
KT Skylife [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT Skylife |  |
Type of Business | Satellite TV |  |
Location | Korea |  |
Controlling percentage ownership | 50.20% | 50.30% |
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 | 100.00% | 100.00% |
Closing month | December |  |
KT Estate Inc. [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT Estate Inc. | KT Estate Inc. | KT Estate Inc.
Type of Business | Residential building development and supply |  |
Location | Korea |  |
Controlling percentage ownership | 100.00% | 100.00% |
Closing month | December |  |
Total assets | ₩ 2,480,333 | ₩ 2,370,940 | ₩ 1,689,601
Total liabilities | 833,842 | 791,884 | 325,429
Operating revenues | 478,188 | 577,578 | 365,335
Profit (loss) for the year | ₩ 58,780 | ₩ 213,203 | ₩ 14,370
KT Investment Management Inc. (KT AMC Co., Ltd.) [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT Investment Management Inc. (KT AMC Co., Ltd.) |  |
Type of Business | Asset management, real estate 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. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KTGDH Co., Ltd. | KTGDH Co., Ltd. |
Type of Business | Data center development and related service |  |
Location | Korea |  |
Controlling percentage ownership | 100.00% | 100.00% |
Closing month | December |  |
Total assets | ₩ 12,059 | ₩ 11,464 |
Total liabilities | 1,596 | 1,560 |
Operating revenues | 4,323 | 4,423 |
Profit (loss) for the year | ₩ 451 | ₩ 553 |
KT Sat Co., Ltd. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT Sat Co., Ltd. |  |
Type of Business | Satellite communication business |  |
Location | Korea |  |
Controlling percentage ownership | 100.00% | 100.00% |
Closing month | December |  |
Total assets | ₩ 677,980 |  |
Total liabilities | 89,644 |  |
Operating revenues | 185,313 |  |
Profit (loss) for the year | ₩ 28,073 |  |
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 |  |
KT Sports Co., Ltd. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT Sports Co., Ltd. |  |
Type of Business | Management of sports teams |  |
Location | Korea |  |
Controlling percentage ownership | 100.00% | 100.00% |
Closing month | December |  |
Total assets | ₩ 28,220 |  |
Total liabilities | 15,461 |  |
Operating revenues | 65,350 |  |
Profit (loss) for the year | ₩ (7,302) |  |
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
Type of Business | Music and contents investment business |  |
Location | Korea |  |
Controlling percentage ownership | 100.00% | 100.00% |
Closing month | December |  |
Total assets | ₩ 15,718 | ₩ 14,985 | ₩ 15,021
Total liabilities | 277 | 278 | 285
Operating revenues | 1,040 | 253 | 169
Profit (loss) for the year | ₩ 735 | ₩ (30) | ₩ (116)
KT-Michigan global contents fund [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT-Michigan Global Content Fund | KT-Michigan Global Contents Fund | KT-Michigan Global Contents Fund
Type of Business | Content investment business |  |
Location | Korea |  |
Controlling percentage ownership | 88.60% | 88.60% |
Closing month | December |  |
Total assets | ₩ 2,371 | ₩ 3,552 | ₩ 10,382
Total liabilities | 27 | 112 | 175
Operating revenues | 33 | 13,592 | 111
Profit (loss) for the year | ₩ (1,095) | ₩ 10,032 | ₩ (1,420)
KTCS Corporation [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KTCS Corporation | KTCS Corporation | KTCS Corporation
Type of Business | Database and online information provider |  |
Location | Korea |  |
Controlling percentage ownership | 34.10% | 32.20% |
Closing month | December |  |
Total assets | ₩ 419,726 | ₩ 416,750 | ₩ 384,919
Total liabilities | 228,618 | 234,172 | 215,175
Operating revenues | 1,031,010 | 968,499 | 933,006
Profit (loss) for the year | ₩ 17,634 | ₩ 19,034 | ₩ 11,323
KTIS Corporation [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KTIS Corporation | KTIS Corporation | KTIS Corporation
Type of Business | Database and online information provider |  |
Location | Korea |  |
Controlling percentage ownership | 33.30% | 31.40% |
Closing month | December |  |
Total assets | ₩ 396,208 | ₩ 369,361 | ₩ 294,289
Total liabilities | 199,204 | 177,619 | 126,894
Operating revenues | 536,229 | 487,801 | 454,172
Profit (loss) for the year | ₩ 15,917 | ₩ 24,944 | ₩ 7,387
KT M Mobile Co., Ltd. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT M Mobile Co., Ltd. |  |
Type of Business | Special category telecommunications operator and sales of communication device |  |
Location | Korea |  |
Controlling percentage ownership | 100.00% | 100.00% |
Closing month | December |  |
Total assets | ₩ 152,114 |  |
Total liabilities | 49,816 |  |
Operating revenues | 262,918 |  |
Profit (loss) for the year | ₩ 4,731 |  |
KT Investment Co., Ltd. [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT Investment Co., Ltd. | KT Investment Co., Ltd. | KT Investment Co., Ltd.
Type of Business | Financing business for new technology |  |
Location | Korea |  |
Controlling percentage ownership | 100.00% | 100.00% |
Closing month | December |  |
Total assets | ₩ 103,354 | ₩ 87,366 | ₩ 115,627
Total liabilities | 79,182 | 66,108 | 93,695
Operating revenues | 15,136 | 21,040 | 47,801
Profit (loss) for the year | ₩ 2,840 | ₩ (697) | ₩ 4,680
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 |  |
Next Connect PFV Inc. [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | Next Connect PFV | Next Connect PFV Inc. | Next Connect PFV Inc.
Type of Business | Residential building development and supply |  |
Location | Korea |  |
Controlling percentage ownership | 100.00% | 100.00% |
Closing month | December |  |
Total assets |  | ₩ 518,441 | ₩ 394,268
Total liabilities |  | 167,963 | 37,271
Operating revenues |  | 0 | 26
Profit (loss) for the year |  | ₩ (6,519) | ₩ (7,101)
KT Rwanda Networks Ltd. [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT Rwanda Networks Ltd. | KT Rwanda Networks Ltd. | KT Rwanda Networks Ltd.
Type of Business | Network installation and management |  |
Location | Rwanda |  |
Controlling percentage ownership | 51.00% | 51.00% |
Closing month | December |  |
Total assets | ₩ 126,721 | ₩ 125,860 | ₩ 114,768
Total liabilities | 267,369 | 236,389 | 191,781
Operating revenues | 30,834 | 23,328 | 17,870
Profit (loss) for the year | ₩ (27,467) | ₩ (28,770) | ₩ (34,610)
AOS Ltd. [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | AOS Ltd. | AOS Ltd. | AOS Ltd.
Type of Business | System integration and maintenance |  |
Location | Rwanda |  |
Controlling percentage ownership | 51.00% | 51.00% |
Closing month | December |  |
Total assets | ₩ 10,972 | ₩ 11,539 | ₩ 11,812
Total liabilities | 905 | 2,812 | 3,875
Operating revenues | 8,049 | 6,942 | 5,719
Profit (loss) for the year | ₩ 1,274 | ₩ 823 | ₩ 296
KT Japan Co., Ltd. [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT Japan Co., Ltd. | KT Japan Co., Ltd. | KT Japan Co., Ltd.
Type of Business | Foreign investment business and local counter work |  |
Location | Japan |  |
Controlling percentage ownership | 100.00% | 100.00% |
Closing month | December |  |
Total assets | ₩ 1,888 | ₩ 1,474 | ₩ 2,694
Total liabilities | 3,141 | 2,633 | 2,622
Operating revenues | 3,263 | 1,298 | 1,853
Profit (loss) for the year | ₩ 226 | ₩ (142) | ₩ 1
East Telecom LLC [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | East Telecom LLC | East Telecom LLC |
Type of Business | Wireless/fixed line internet business |  |
Location | Uzbekistan |  |
Controlling percentage ownership | 91.60% | 91.60% |
Closing month | December |  |
Total assets | ₩ 42,691 | ₩ 35,904 |
Total liabilities | 21,645 | 22,088 |
Operating revenues | 27,030 | 11,960 |
Profit (loss) for the year | ₩ 6,419 | ₩ 2,487 |
KT America, Inc. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT America, Inc. | KT America, Inc. | KT AMERICA, INC
Type of Business | Foreign investment business and local counter work |  |
Location | USA |  |
Controlling percentage ownership | 100.00% | 100.00% |
Closing month | December |  |
Total assets | ₩ 5,945 | ₩ 4,884 | ₩ 4,498
Total liabilities | 843 | 101 | 125
Operating revenues | 8,070 | 6,508 | 6,808
Profit (loss) for the year | ₩ 37 | ₩ 201 | ₩ 712
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 Hong Kong Telecommunications Co., Ltd. [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT Hong Kong Telecommunications Co., Ltd. | KT Hong Kong Telecommunications Co., Ltd. | KT Hong Kong Telecommunications Co., Ltd.
Type of Business | Fixed line telecommunication business |  |
Location | Hong Kong |  |
Controlling percentage ownership | 100.00% | 100.00% |
Closing month | December |  |
Total assets | ₩ 10,505 | ₩ 6,613 | ₩ 6,159
Total liabilities | 4,768 | 1,346 | 2,800
Operating revenues | 20,413 | 18,825 | 16,386
Profit (loss) for the year | ₩ 51 | ₩ 1,313 | ₩ 1,308
Korea Telecom Singapore Pte.Ltd. [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | Korea Telecom Singapore Pte. Ltd. |  |
Type of Business | Foreign investment business and local counter work |  |
Location | Singapore |  |
Controlling percentage ownership | 100.00% | 100.00% |
Closing month | December |  |
Texnoprosistem LLC [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 Huimangjieum [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT Huimangjieum |  |
Type of Business | Manufacturing |  |
Location | Korea |  |
Controlling percentage ownership | 100.00% | 100.00% |
Closing month | December |  |
Total assets | ₩ 6,984 |  |
Total liabilities | 2,582 |  |
Operating revenues | 22,860 |  |
Profit (loss) for the year | ₩ 494 |  |
K-REALTY RENTAL HOUSING REIT 3 [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | K-REALTY RENTAL HOUSING REIT 3 |  |
Type of Business | Residential building |  |
Location | Korea |  |
Controlling percentage ownership | 88.60% | 88.60% |
Closing month | December |  |
Storywiz Co Ltd [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | Storywiz Co., Ltd. |  | Storywiz Co., Ltd
Type of Business | Contents and software development and supply |  |
Location | Korea |  |
Controlling percentage ownership | 100.00% | 100.00% |
Closing month | December |  |
Total assets |  |  | ₩ 21,594
Total liabilities |  |  | 10,065
Operating revenues |  |  | 19,209
Profit (loss) for the year |  |  | ₩ (1,954)
KT Engineering Co., Ltd. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT Engineering Co., Ltd. |  |
Type of Business | Telecommunication facility construction and maintenance |  |
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. | KT Studio Genie Co., Ltd. |
Type of Business | Data communication service and data communication construction business |  |
Location | Korea |  |
Controlling percentage ownership | 90.90% | 100.00% |
Closing month | December |  |
Total assets | ₩ 987,270 | ₩ 648,534 |
Total liabilities | 268,911 | 276,933 |
Operating revenues | 723,580 | 90,047 |
Profit (loss) for the year | ₩ 189,498 | ₩ (16,443) |
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% | 100.00% |
Closing month | December |  |
Lolab Co Ltd [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | Lolab Co., Ltd. | Lolab Co., Ltd. |
Type of Business | Truck transportation and trucking arrangement business |  |
Location | Korea |  |
Controlling percentage ownership | 79.80% | 80.00% |
Closing month | December |  |
Total assets | ₩ 35,091 | ₩ 26,726 |
Total liabilities | 17,247 | 897 |
Operating revenues | 74,881 | 2,107 |
Profit (loss) for the year | ₩ (7,985) | ₩ (134) |
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% | 100.00% |
Closing month | December |  |
Millie Seojae [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | Millie Seojae |  |
Type of Business | Book contents service |  |
Location | Korea |  |
Controlling percentage ownership | 38.60% | 38.60% |
Closing month | December |  |
KT ES Pte Ltd [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT ES Pte. Ltd. | KT ES Pte. Ltd. |
Type of Business | Foreign investment business |  |
Location | Singapore |  |
Controlling percentage ownership | 57.60% | 57.60% |
Closing month | December |  |
Total assets | ₩ 240,721 | ₩ 240,331 |
Total liabilities | 88,640 | 80,597 |
Operating revenues | 78,815 | 15,157 |
Profit (loss) for the year | ₩ (23,957) | ₩ (6,355) |
Epsilon Global Communications Pte. Ltd [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% | 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% | 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% | 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% | 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% | 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% | 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% | 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 | United Arab Emirates |  |
Controlling percentage ownership | 49.00% | 49.00% |
Closing month | December |  |
Nasmedia KT Alpha 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% | 100.00% |
Closing month | December |  |
KT Strategic Investment Fund 6 [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT Strategic Investment Fund 6 |  |
Type of Business | Investment fund |  |
Location | Korea |  |
Controlling percentage ownership | 100.00% | 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% | 100.00% |
Closing month | December |  |
Altimedia Corporation [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | Altimedia Corporation | Altimedia Corporation |
Type of Business | Software development and delivery |  |
Location | Korea |  |
Controlling percentage ownership | 100.00% | 100.00% |
Closing month | December |  |
Total assets | ₩ 44,861 | ₩ 32,338 |
Total liabilities | 15,777 | 9,742 |
Operating revenues | 47,203 | 6,968 |
Profit (loss) for the year | ₩ 6,035 | ₩ 1,037 |
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% | 100.00% |
Closing month | December |  |
BCCARD VIETNAM LTD. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | BCCARD VIETNAM LTD. |  |
Type of Business | Software sales business |  |
Location | Vietnam |  |
Controlling percentage ownership | 100.00% | 100.00% |
Closing month | December |  |
KTP SERVICES INC. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KTP SERVICES INC. |  |
Type of Business | Fixed line telecommunication business |  |
Location | Philippines |  |
Controlling percentage ownership | 100.00% | 100.00% |
Closing month | December |  |
Total assets | ₩ 3,832 |  |
Total liabilities | 2,044 |  |
Operating revenues | 776 |  |
Profit (loss) for the year | ₩ (255) |  |
KT RUS LLC [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT RUS LLC |  |
Type of Business | Foreign investment business |  |
Location | Russia |  |
Controlling percentage ownership | 100.00% |  |
Closing month | December |  |
Total assets | ₩ 967 |  |
Total liabilities | 16 |  |
Operating revenues | 5 |  |
Profit (loss) for the year | ₩ (871) |  |
Hangang Real Estate Investment Trust No. 24 [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | Hangang Real Estate Investment Trust No. 24 |  |
Type of Business | Investment fund |  |
Location | Korea |  |
Controlling percentage ownership | 75.00% |  |
Closing month | December |  |
kt cloud Co., Ltd. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | kt cloud Co., Ltd. |  |
Type of Business | Information telecommunication business |  |
Location | Korea |  |
Controlling percentage ownership | 100.00% |  |
Closing month | December |  |
Total assets | ₩ 1,348,684 |  |
Total liabilities | 245,872 |  |
Operating revenues | 432,118 |  |
Profit (loss) for the year | ₩ 14,712 |  |
KT DX Vietnam Company Limited [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT DX Vietnam Company Limited |  |
Type of Business | Software development |  |
Location | Vietnam |  |
Controlling percentage ownership | 100.00% |  |
Closing month | December |  |
Total assets | ₩ 1,815 |  |
Total liabilities | 6 |  |
Operating revenues | 0 |  |
Profit (loss) for the year | ₩ 26 |  |
Pocheon Jeonggyori Development Co., Ltd. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | Pocheon Jeonggyori Development Co., Ltd. |  |
Type of Business | Residential building development |  |
Location | Korea |  |
Controlling percentage ownership | 80.90% |  |
Closing month | December |  |
Alpha DX Solution Co., Ltd. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | Alpha DX Solution Co., Ltd. |  |
Type of Business | Data communication service |  |
Location | Korea |  |
Controlling percentage ownership | 100.00% |  |
Closing month | December |  |
PT CRANIUM ROYAL ADITAMA [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | PT CRANIUM ROYAL ADITAMA |  |
Type of Business | Software development |  |
Location | Indonesia |  |
Controlling percentage ownership | 67.00% |  |
Closing month | December |  |
KT Primorye IDC LLC [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT Primorye IDC LLC |  |
Type of Business | Data processing and associated service delivery |  |
Location | Russia |  |
Controlling percentage ownership | 99.00% |  |
Closing month | December |  |
Juice Inc. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | Juice Inc. |  |
Type of Business | Online information provider/Software development and delivery |  |
Location | Korea |  |
Controlling percentage ownership | 41.20% |  |
Closing month | December |  |
Spark and Associates Inc. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | SPARK AND ASSOCIATES INC. |  |
Type of Business | Network service industry |  |
Location | Korea |  |
Controlling percentage ownership | 100.00% |  |
Closing month | December |  |
KT Powertel Co., Ltd. [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary |  |  | KT Powertel Co., Ltd.
Total assets |  |  | ₩ 119,694
Total liabilities |  |  | 18,833
Operating revenues |  |  | 65,897
Profit (loss) for the year |  |  | 3,809
KT Linkus Co Ltd [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Total assets |  | ₩ 54,219 | 58,372
Total liabilities |  | 53,316 | 54,022
Operating revenues |  | 81,434 | 84,519
Profit (loss) for the year |  | ₩ (3,095) | ₩ (3,212)
KT Sports Inc [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary |  |  | KT Sports Inc.
Total assets |  |  | ₩ 26,572
Total liabilities |  |  | 14,940
Operating revenues |  |  | 46,608
Profit (loss) for the year |  |  | ₩ (2,516)
KT music contents fund no.1 [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary |  |  | KT Music Contents Fund No.1
Total assets |  |  | ₩ 4,844
Total liabilities |  |  | 1,525
Operating revenues |  |  | 243
Profit (loss) for the year |  |  | ₩ 84
KT Sat Inc. [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary |  | KT Sat Inc. | KT Sat Inc.
Total assets |  | ₩ 593,616 | ₩ 630,740
Total liabilities |  | 34,169 | 92,791
Operating revenues |  | 174,750 | 173,693
Profit (loss) for the year |  | ₩ 20,830 | ₩ 14,753
KBTO sp.zo.o. [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary |  |  | KBTO sp.z o.o.
Total assets |  |  | ₩ 438
Total liabilities |  |  | 117
Operating revenues |  |  | 490
Profit (loss) for the year |  |  | ₩ (2,823)
Autopion Co., Ltd. [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary |  |  | Autopion Co., Ltd.
Total assets |  |  | ₩ 4,903
Total liabilities |  |  | 4,961
Operating revenues |  |  | 6,174
Profit (loss) for the year |  |  | ₩ (2,459)
Korea Telecom China Co., Ltd. [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary |  |  | Korea Telecom China Co., Ltd.
Total assets |  |  | ₩ 381
Total liabilities |  |  | 21
Operating revenues |  |  | 618
Profit (loss) for the year |  |  | ₩ (492)
KT Hopemate [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary |  | KT Hopemate | KT Hopemate
Total assets |  | ₩ 6,311 | ₩ 3,720
Total liabilities |  | 2,978 | 2,787
Operating revenues |  | 12,538 | 5,239
Profit (loss) for the year |  | ₩ 116 | ₩ (13)
KT M mobile Inc. [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary |  | KT M Mobile Inc. | KT M Mobile Inc.
Total assets |  | ₩ 144,175 | ₩ 129,011
Total liabilities |  | 40,749 | 27,281
Operating revenues |  | 204,641 | 163,472
Profit (loss) for the year |  | ₩ 5,918 | ₩ (3,617)
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 |  |  | ₩ 5,703
Total liabilities |  |  | 1,165
Operating revenues |  |  | 333
Profit (loss) for the year |  |  | ₩ 83
KT Dutch B.V. [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary |  |  | KT Dutch B.V.
Total assets |  |  | ₩ 29,585
Total liabilities |  |  | 10,109
Operating revenues |  |  | 26,782
Profit (loss) for the year |  |  | ₩ 6,061
KT Belgium [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary |  |  | KT Belgium
Total assets |  |  | ₩ 87,608
Total liabilities |  |  | 0
Operating revenues |  |  | (81)
Profit (loss) for the year |  |  | ₩ (81)
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.) | KT Engineering Co., Ltd. (KT ENGCORE Co., Ltd.)
Total assets | ₩ 141,463 | ₩ 185,850 | ₩ 138,220
Total liabilities | 89,853 | 144,832 | 102,963
Operating revenues | 258,435 | 284,998 | 346,040
Profit (loss) for the year | ₩ 10,302 | ₩ 366 | ₩ (8,461)
Nasmedia Co Ltd [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | Nasmedia Co., Ltd. | Nasmedia Co., Ltd. | Nasmedia Co., Ltd.
Total assets | ₩ 516,945 | ₩ 490,394 | ₩ 422,039
Total liabilities | 275,730 | 268,618 | 221,371
Operating revenues | 153,211 | 125,876 | 113,136
Profit (loss) for the year | 27,691 | ₩ 27,120 | ₩ 23,134
KT M Hows Co., Ltd. [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary |  |  | KT M Hows Co., Ltd.
Total assets |  |  | ₩ 104,704
Total liabilities |  |  | 76,315
Operating revenues |  |  | 44,860
Profit (loss) for the year |  |  | ₩ 6,935
KTGDH Co., Ltd. (KTSB Data service) [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary |  |  | KTGDH Co., Ltd. (KTSB Data Service)
Total assets |  |  | ₩ 11,003
Total liabilities |  |  | 1,669
Operating revenues |  |  | 4,282
Profit (loss) for the year |  |  | ₩ 538
KT Philippines [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary |  | KT Philippines |
Total assets |  | ₩ 3,641 |
Total liabilities |  | 1,243 |
Operating revenues |  | 0 |
Profit (loss) for the year |  | ₩ 0 |
KT Sports Inc.[member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary |  | KT Sports Inc. |
Total assets |  | ₩ 29,524 |
Total liabilities |  | 19,740 |
Operating revenues |  | 67,612 |
Profit (loss) for the year |  | ₩ (2,039) |
Next Connect PFV [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary |  | Next Connect PFV |
Total assets | 624,734 |  |
Total liabilities | 277,967 |  |
Operating revenues | 3 |  |
Profit (loss) for the year | ₩ (3,712) |  |

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