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General Information - Summary of Consolidated Subsidiaries (Detail) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of subsidiaries [line items] |  |  |
Total assets | ₩ 42,002,758 | ₩ 42,791,647 |
Total liabilities | 24,035,197 | 24,249,073 |
Operating revenues | 26,379,644 | 26,287,201 | ₩ 25,638,855
Profit (loss) for the year | ₩ 406,669 | ₩ 972,182 | ₩ 1,385,635
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 | ₩ 54,247 | ₩ 64,178 | ₩ 47,734
Total liabilities | 55,750 | 63,452 | 47,498
Operating revenues | 79,171 | 81,645 | 76,135
Profit (loss) for the year | ₩ (1,726) | ₩ 821 | ₩ (614)
KT Submarine Co., Ltd. [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary |  |  | KT Submarine Co., Ltd.
Total assets |  |  | ₩ 120,255
Total liabilities |  |  | 7,884
Operating revenues |  |  | 42,848
Profit (loss) for the year |  |  | ₩ (12,126)
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 | 92.70% | 86.80% |
Closing month | December |  |
Total assets | ₩ 400,437 | ₩ 375,596 | ₩ 370,004
Total liabilities | 253,509 | 235,947 | 230,965
Operating revenues | 532,687 | 527,015 | 517,406
Profit (loss) for the year | ₩ 8,793 | ₩ 5,728 | ₩ 4,267
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 |  |  | ₩ 406,236
Total liabilities |  |  | 172,211
Operating revenues |  |  | 516,737
Profit (loss) for the year |  |  | ₩ 13,115
KT Alpha Co., Ltd. [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT Alpha Co., Ltd. | KT Alpha Co., Ltd. |
Type of Business | Data communication |  |
Location | Korea |  |
Controlling percentage ownership | 73.00% | 73.00% |
Closing month | December |  |
Total assets | ₩ 464,180 | ₩ 443,639 |
Total liabilities | 201,902 | 191,254 |
Operating revenues | 421,191 | 437,308 |
Profit (loss) for the year | ₩ 20,682 | ₩ 19,352 |
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.
Type of Business | Opening services of fixed line |  |
Location | Korea |  |
Controlling percentage ownership | 67.30% | 67.30% |
Closing month | December |  |
Total assets | ₩ 56,706 | ₩ 63,760 | ₩ 74,673
Total liabilities | 56,846 | 55,360 | 65,820
Operating revenues | 228,816 | 242,119 | 252,304
Profit (loss) for the year | ₩ (6,665) | ₩ 1,212 | ₩ 3,227
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.
Type of Business | Opening services of fixed line |  |
Location | Korea |  |
Controlling percentage ownership | 77.30% | 77.30% |
Closing month | December |  |
Total assets | ₩ 57,827 | ₩ 71,576 | ₩ 80,450
Total liabilities | 51,826 | 58,745 | 66,479
Operating revenues | 285,634 | 291,170 | 301,720
Profit (loss) for the year | ₩ (5,881) | ₩ 1,354 | ₩ 3,067
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.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 | ₩ 5,961,047 | ₩ 6,352,878 | ₩ 5,666,075
Total liabilities | 4,196,724 | 4,722,432 | 4,109,200
Operating revenues | 3,806,858 | 4,027,450 | 3,897,090
Profit (loss) for the year | ₩ 141,149 | ₩ 76,545 | ₩ 148,341
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 | 72.20% | 72.20% |
Closing month | December |  |
H&C Network [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | H&C Network | H&C Network | 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 | ₩ 59,808 | ₩ 81,107 | ₩ 82,737
Total liabilities | 5,039 | 4,863 | 6,640
Operating revenues | 26,188 | 27,205 | 27,392
Profit (loss) for the year | ₩ 1,868 | ₩ 1,814 | ₩ 992
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 | 67.30% | 63.90% |
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 | 91.60% | 91.60% |
Closing month | December |  |
Total assets | ₩ 388,812 | ₩ 393,667 | ₩ 401,932
Total liabilities | 179,630 | 202,067 | 228,474
Operating revenues | 721,962 | 727,477 | 723,161
Profit (loss) for the year | ₩ 34,883 | ₩ 33,971 | ₩ 30,941
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 | ₩ 261,539 | ₩ 258,477 | ₩ 255,310
Total liabilities | 193,526 | 209,075 | 204,336
Operating revenues | 807,735 | 695,856 | 730,802
Profit (loss) for the year | ₩ 19,681 | ₩ 3,783 | ₩ 8,105
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 | 36.00% | 36.00% |
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. | 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 | ₩ 50,262 | ₩ 50,750 | ₩ 38,684
Total liabilities | 32,012 | 28,431 | 22,553
Operating revenues | 103,410 | 101,428 | 83,085
Profit (loss) for the year | ₩ 1,287 | ₩ 8,457 | ₩ 4,607
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 | ₩ 51,458 | ₩ 46,839 | ₩ 42,011
Total liabilities | 28,427 | 26,012 | 25,416
Operating revenues | 103,765 | 101,422 | 83,330
Profit (loss) for the year | ₩ 3,719 | ₩ 5,749 | ₩ 5,035
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 | ₩ 1,040,188 | ₩ 1,220,842 | ₩ 1,359,166
Total liabilities | 463,594 | 479,369 | 503,679
Operating revenues | 1,026,644 | 1,034,342 | 1,038,468
Profit (loss) for the year | ₩ (156,033) | ₩ (109,407) | ₩ 20,941
KT Skylife [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT Skylife |  |
Type of Business | Satellite TV |  |
Location | Korea |  |
Controlling percentage ownership | 50.50% | 50.60% |
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 | ₩ 2,740,463 | ₩ 2,746,546 | ₩ 2,480,333
Total liabilities | 1,099,622 | 1,121,970 | 833,842
Operating revenues | 555,984 | 511,018 | 478,188
Profit (loss) for the year | ₩ 24,290 | ₩ 871 | ₩ 58,780
KT Investment Management Inc. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT Investment Management Inc. |  |
Type of Business | Asset management, real estate, and consulting services |  |
Location | Korea |  |
Controlling percentage ownership | 100.00% | 100.00% |
Closing month | December |  |
KT GDH Co., Ltd. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT GDH Co., Ltd. | KT GDH Co., Ltd. | KT GDH 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 | ₩ 7,998 | ₩ 7,760 | ₩ 12,059
Total liabilities | 1,462 | 1,501 | 1,596
Operating revenues | 3,977 | 4,346 | 4,323
Profit (loss) for the year | ₩ 303 | ₩ 648 | ₩ 451
KT Sat Co., Ltd. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT Sat Co., Ltd. | KT Sat Co., Ltd. | KT Sat Co., Ltd.
Type of Business | Satellite communication business |  |
Location | Korea |  |
Controlling percentage ownership | 100.00% | 100.00% |
Closing month | December |  |
Total assets | ₩ 733,574 | ₩ 699,607 | ₩ 677,980
Total liabilities | 92,877 | 88,524 | 89,644
Operating revenues | 188,412 | 182,274 | 185,313
Profit (loss) for the year | ₩ 30,741 | ₩ 30,502 | ₩ 28,073
Nasmedia, Co., Ltd. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | Nasmedia Co., Ltd. | Nasmedia Co., Ltd. | Nasmedia Co., Ltd.
Type of Business | Solution provider and IPTV advertisement sales business |  |
Location | Korea |  |
Controlling percentage ownership | 44.10% | 44.10% |
Closing month | December |  |
Total assets | ₩ 492,782 | ₩ 513,311 | ₩ 516,945
Total liabilities | 252,707 | 262,336 | 275,730
Operating revenues | 143,639 | 147,934 | 153,211
Profit (loss) for the year | ₩ (3,884) | ₩ 17,703 | ₩ 27,691
KT Sports Co., Ltd. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT Sports Co., Ltd. | KT Sports Co., Ltd. | 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 | ₩ 23,299 | ₩ 26,615 | ₩ 28,220
Total liabilities | 7,435 | 11,299 | 15,461
Operating revenues | 83,888 | 66,309 | 65,350
Profit (loss) for the year | ₩ 859 | ₩ (12,386) | ₩ (7,302)
KT 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 | ₩ 5,508 | ₩ 5,558 | ₩ 15,718
Total liabilities | 1,589 | 1,772 | 277
Operating revenues | 199 | 534 | 1,040
Profit (loss) for the year | ₩ 134 | ₩ (992) | ₩ 735
KT-Michigan Global Content Fund [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary |  |  | KT-Michigan Global Content Fund
Total assets |  |  | ₩ 2,371
Total liabilities |  |  | 27
Operating revenues |  |  | 33
Profit (loss) for the year |  |  | ₩ (1,095)
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% | 34.10% |
Closing month | December |  |
Total assets | ₩ 435,066 | ₩ 434,900 | ₩ 419,726
Total liabilities | 232,129 | 234,850 | 228,618
Operating revenues | 1,122,264 | 1,035,911 | 1,031,010
Profit (loss) for the year | ₩ 6,814 | ₩ 15,804 | ₩ 17,634
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% | 33.30% |
Closing month | December |  |
Total assets | ₩ 469,932 | ₩ 447,609 | ₩ 396,208
Total liabilities | 261,826 | 243,519 | 199,204
Operating revenues | 604,479 | 593,162 | 536,229
Profit (loss) for the year | ₩ 11,862 | ₩ 13,922 | ₩ 15,917
KT M Mobile Co., Ltd. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT M Mobile Co., Ltd. | KT M Mobile Co., Ltd. | 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 | ₩ 195,196 | ₩ 176,838 | ₩ 152,114
Total liabilities | 74,570 | 69,317 | 49,816
Operating revenues | 347,933 | 301,049 | 262,918
Profit (loss) for the year | ₩ 13,142 | ₩ 5,605 | ₩ 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 | ₩ 84,369 | ₩ 83,638 | ₩ 103,354
Total liabilities | 56,721 | 57,420 | 79,182
Operating revenues | 19,355 | 24,976 | 15,136
Profit (loss) for the year | ₩ 1,621 | ₩ 2,180 | ₩ 2,840
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 [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | Next Connect PFV | Next Connect PFV | Next Connect PFV
Type of Business | Residential building development and supply |  |
Location | Korea |  |
Controlling percentage ownership | 100.00% | 100.00% |
Closing month | December |  |
Total assets | ₩ 1,429,260 | ₩ 946,687 | ₩ 624,734
Total liabilities | 1,133,891 | 629,809 | 277,967
Operating revenues | 137 | 0 | 3
Profit (loss) for the year | ₩ (21,508) | ₩ (29,889) | ₩ (3,712)
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 install management |  |
Location | Rwanda |  |
Controlling percentage ownership | 51.00% | 51.00% |
Closing month | December |  |
Total assets | ₩ 131,362 | ₩ 134,847 | ₩ 126,721
Total liabilities | 341,313 | 313,787 | 267,369
Operating revenues | 21,624 | 26,788 | 30,834
Profit (loss) for the year | ₩ (21,025) | ₩ (57,628) | ₩ (27,467)
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 | ₩ 14,305 | ₩ 10,763 | ₩ 10,972
Total liabilities | 19,422 | 1,983 | 905
Operating revenues | 10,768 | 8,287 | 8,049
Profit (loss) for the year | ₩ 643 | ₩ 128 | ₩ 1,274
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 | ₩ 1,750 | ₩ 2,015 | ₩ 1,888
Total liabilities | 3,289 | 3,341 | 3,141
Operating revenues | 2,897 | 2,793 | 3,263
Profit (loss) for the year | ₩ (180) | ₩ (110) | ₩ 226
East Telecom LLC [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | East Telecom LLC | 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 | ₩ 75,828 | ₩ 48,483 | ₩ 42,691
Total liabilities | 40,371 | 22,632 | 21,645
Operating revenues | 38,100 | 30,350 | 27,030
Profit (loss) for the year | ₩ 6,938 | ₩ 7,723 | ₩ 6,419
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 | ₩ 6,843 | ₩ 6,013 | ₩ 5,945
Total liabilities | 614 | 701 | 843
Operating revenues | 7,445 | 8,928 | 8,070
Profit (loss) for the year | ₩ 192 | ₩ 133 | ₩ 37
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 | ₩ 9,105 | ₩ 11,142 | ₩ 10,505
Total liabilities | 1,680 | 5,121 | 4,768
Operating revenues | 16,917 | 19,373 | 20,413
Profit (loss) for the year | ₩ 423 | ₩ 143 | ₩ 51
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 | KT Huimangjieum | KT Huimangjieum
Type of Business | Manufacturing |  |
Location | Korea |  |
Controlling percentage ownership | 100.00% | 100.00% |
Closing month | December |  |
Total assets | ₩ 8,854 | ₩ 8,073 | ₩ 6,984
Total liabilities | 2,275 | 2,715 | 2,582
Operating revenues | 19,285 | 17,687 | 22,860
Profit (loss) for the year | ₩ 1,338 | ₩ 1,012 | 494
KT Engineering Co., Ltd. (KT ENGCORE Co., Ltd) [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT Engineering Co., Ltd. (KT ENGCORE Co., Ltd.) |  |
Total assets |  |  | 141,463
Total liabilities |  |  | 89,853
Operating revenues |  |  | 258,435
Profit (loss) for the year |  |  | ₩ 10,302
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. |  |
Type of Business | Contents and software development and supply |  |
Location | Korea |  |
Controlling percentage ownership | 100.00% | 100.00% |
Closing month | December |  |
KT Engineering Co., Ltd. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT Engineering Co., Ltd. | KT Engineering Co., Ltd. |
Type of Business | Telecommunication facility construction and maintenance |  |
Location | Korea |  |
Controlling percentage ownership | 100.00% | 100.00% |
Closing month | December |  |
Total assets | ₩ 183,753 | ₩ 160,243 |
Total liabilities | 123,132 | 104,005 |
Operating revenues | 333,874 | 262,063 |
Profit (loss) for the year | ₩ 2,634 | ₩ 5,327 |
KT Studio Genie Co., Ltd. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT Studio Genie Co., Ltd. | 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% | 90.90% |
Closing month | December |  |
Total assets | ₩ 880,509 | ₩ 989,187 | ₩ 987,270
Total liabilities | 212,683 | 259,413 | 268,911
Operating revenues | 452,685 | 542,955 | 723,580
Profit (loss) for the year | ₩ (29,364) | ₩ 13,507 | ₩ 189,498
Lolab Co., Ltd. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary |  | Lolab Co., Ltd. | Lolab Co., Ltd.
Total assets |  | ₩ 42,744 | ₩ 35,091
Total liabilities |  | 37,838 | 17,247
Operating revenues |  | 173,035 | 74,881
Profit (loss) for the year |  | ₩ (12,938) | ₩ (7,985)
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 |  |
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 | 38.70% | 30.20% |
Closing month | December |  |
KT ES Pte. Ltd. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT ES Pte. Ltd. | KT ES Pte. Ltd. | KT ES Pte. Ltd.
Type of Business | Foreign investment business |  |
Location | Singapore |  |
Controlling percentage ownership | 68.80% | 57.60% |
Closing month | December |  |
Total assets | ₩ 78,800 | ₩ 117,009 | ₩ 240,721
Total liabilities | 59,114 | 90,392 | 88,640
Operating revenues | 93,358 | 87,865 | 78,815
Profit (loss) for the year | ₩ (79,014) | ₩ (124,850) | ₩ (23,957)
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 (SP) PTE. Ltd. [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 (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 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 |  |
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 |  |
Altimedia Corporation [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | Altimedia Corporation | 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 | ₩ 45,287 | ₩ 48,381 | ₩ 44,861
Total liabilities | 11,919 | 12,374 | 15,777
Operating revenues | 36,774 | 45,035 | 47,203
Profit (loss) for the year | ₩ 290 | ₩ 7,352 | ₩ 6,035
Altimidia B.V. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | Altimidia B.V. |  |
Type of Business | Software development and delivery |  |
Location | Netherlands |  |
Controlling percentage ownership | 100.00% | 100.00% |
Closing month | December |  |
Altimidia Vietnam [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | Altimidia Vietnam |  |
Type of Business | Software development and delivery |  |
Location | Vietnam |  |
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 |  |
KT RUS LLC [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT RUS LLC | KT RUS LLC | KT RUS LLC
Type of Business | Foreign investment business |  |
Location | Russia |  |
Controlling percentage ownership | 100.00% | 100.00% |
Closing month | December |  |
Total assets | ₩ 420 | ₩ 501 | ₩ 967
Total liabilities | 0 | 10 | 16
Operating revenues | 1 | 1 | 5
Profit (loss) for the year | ₩ (31) | ₩ (378) | ₩ (871)
KTP SERVICES INC. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KTP SERVICES INC. | KTP SERVICES INC. | KTP SERVICES INC.
Type of Business | Fixed line telecommunication business |  |
Location | Philippines |  |
Controlling percentage ownership | 100.00% | 100.00% |
Closing month | December |  |
Total assets | ₩ 3,257 | ₩ 2,967 | ₩ 3,832
Total liabilities | 750 | 919 | 2,044
Operating revenues | 718 | 671 | 776
Profit (loss) for the year | ₩ 272 | ₩ 235 | ₩ (255)
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% | 67.00% |
Closing month | December |  |
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% | 75.00% |
Closing month | December |  |
KT DX Vietnam Company Limited [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT DX VIETNAM COMPANY LIMITED | KT DX VIETNAM COMPANY LIMITED | KT DX Vietnam Company Limited
Type of Business | Software development |  |
Location | Vietnam |  |
Controlling percentage ownership | 100.00% | 100.00% |
Closing month | December |  |
Total assets | ₩ 1,568 | ₩ 1,694 | ₩ 1,815
Total liabilities | 120 | 102 | 6
Operating revenues | 469 | 82 | 0
Profit (loss) for the year | ₩ (262) | ₩ (207) | ₩ 26
kt cloud Co., Ltd. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | kt Cloud Co., Ltd. | kt cloud Co., Ltd. | kt cloud Co., Ltd.
Type of Business | Information and communications development |  |
Location | Korea |  |
Controlling percentage ownership | 92.70% | 92.70% |
Closing month | December |  |
Total assets | ₩ 2,061,020 | ₩ 1,983,972 | ₩ 1,348,684
Total liabilities | 542,569 | 503,241 | 245,872
Operating revenues | 784,284 | 679,825 | 432,118
Profit (loss) for the year | ₩ 35,676 | ₩ 63,956 | ₩ 14,712
KT HEALTHCARE VINA COMPANY LIMITED [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary |  | KT HEALTHCARE VINA COMPANY LIMITED |
Total assets |  | ₩ 12,730 |
Total liabilities |  | 439 |
Operating revenues |  | 0 |
Profit (loss) for the year |  | ₩ (721) |
Open cloud lab Co., Ltd [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | Open cloud lab Co., Ltd. |  |
Type of Business | IT consulting service and Telecommunication equipment sales |  |
Location | Korea |  |
Controlling percentage ownership | 100.00% | 100.00% |
Closing month | December |  |
KT Living, Inc. (formerly KD Living, Inc.) [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT Living, Inc. (formerly KD Living, Inc.) |  |
Type of Business | Residential building management |  |
Location | Korea |  |
Controlling percentage ownership | 100.00% | 100.00% |
Closing month | December |  |
K-Realty Qualified Private Real Estate Investment Trust No. 1 [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | K-Realty Qualified Private Real Estate Investment Trust No. 1 | K-Realty Qualified Private Real Estate InvestmentTrust No. 1 |
Type of Business | Real estate management |  |
Location | Korea |  |
Controlling percentage ownership | 6.50% | 6.50% |
Closing month | December |  |
Total assets | ₩ 79,220 | ₩ 80,266 |
Total liabilities | 50,681 | 50,693 |
Operating revenues | 4,358 | 4,682 |
Profit (loss) for the year | ₩ (1,034) | ₩ (1,037) |
AQUA RETAIL VIETNAM COMPANY LIMITED [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | AQUA RETAIL VIETNAM COMPANY LIMITED | AQUA RETAIL VIETNAM COMPANY LIMITED |
Type of Business | E-voucher issuance and trading business |  |
Location | Vietnam |  |
Controlling percentage ownership | 100.00% | 100.00% |
Closing month | December |  |
Total assets | ₩ 1,903 | ₩ 1,202 |
Total liabilities | 497 | 62 |
Operating revenues | 531 | 16 |
Profit (loss) for the year | ₩ (827) | ₩ (248) |
K-Realty Qualified Private Real Estate Investment Trust No. 4 [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | K-Realty Qualified Private Real Estate Investment Trust No. 4 |  |
Type of Business | Real estate management |  |
Location | Korea |  |
Controlling percentage ownership | 93.90% | 93.90% |
Closing month | December |  |
BC Strategic Investment Fund 2 [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | BC Strategic Investment Fund 2 |  |
Type of Business | Investment fund |  |
Location | Korea |  |
Controlling percentage ownership | 100.00% |  |
Closing month | December |  |
K-Logis Hwaseong Inc. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | K-Logis Hwaseong Inc. |  |
Type of Business | Residential building development and supply |  |
Location | Korea |  |
Controlling percentage ownership | 80.00% |  |
Closing month | December |  |
kt netcore. Co. Ltd. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | kt netcore. Co. Ltd. |  |
Type of Business | Telecommunication facility maintenance and service business |  |
Location | Korea |  |
Controlling percentage ownership | 100.00% |  |
Closing month | December |  |
Total assets | ₩ 61,213 |  |
Total liabilities | 79 |  |
Operating revenues | 0 |  |
Profit (loss) for the year | ₩ 134 |  |
kt p&m [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | kt p&m |  |
Type of Business | Information and communications development and Electrical design corporation |  |
Location | Korea |  |
Controlling percentage ownership | 100.00% |  |
Closing month | December |  |
Total assets | ₩ 10,029 |  |
Total liabilities | 96 |  |
Operating revenues | 0 |  |
Profit (loss) for the year | ₩ (67) |  |

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