XML 99 R86.htm IDEA: XBRL DOCUMENT
v3.24.1.u1

General Information - Summary of Consolidated Subsidiaries (Detail) - KRW (₩) ₩ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of subsidiaries [line items] |  |  |
Total assets | ₩ 42,791,647 | ₩ 40,989,810 |
Total liabilities | 24,249,073 | 22,577,114 |
Operating revenues | 26,287,201 | 25,638,855 | ₩ 24,898,005
Profit (loss) for the year | ₩ 972,182 | ₩ 1,385,635 | ₩ 1,459,395
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 | ₩ 64,178 | ₩ 47,734 | ₩ 54,219
Total liabilities | 63,452 | 47,498 | 53,316
Operating revenues | 81,645 | 76,135 | 81,434
Profit (loss) for the year | ₩ 821 | ₩ (614) | ₩ (3,095)
KT Submarine Co., Ltd. [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary |  | KT Submarine Co., Ltd. | KT Submarine Co., Ltd.
Total assets |  | ₩ 120,255 | ₩ 110,390
Total liabilities |  | 7,884 | 10,736
Operating revenues |  | 42,848 | 31,374
Profit (loss) for the year |  | ₩ (12,126) | ₩ (3,183)
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 | ₩ 375,596 | ₩ 370,004 | ₩ 363,224
Total liabilities | 235,947 | 230,965 | 233,797
Operating revenues | 527,015 | 517,406 | 515,456
Profit (loss) for the year | ₩ 5,728 | ₩ 4,267 | ₩ 3,985
KT Alpha Co Ltd [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT Alpha Co., Ltd. |  |
Type of Business | Data communication |  |
Location | Korea |  |
Controlling percentage ownership | 73.00% | 73.00% |
Closing month | December |  |
Total assets | ₩ 443,639 |  |
Total liabilities | 191,254 |  |
Operating revenues | 437,308 |  |
Profit (loss) for the year | ₩ 19,352 |  |
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.)
Total assets |  | ₩ 406,236 | ₩ 390,671
Total liabilities |  | 172,211 | 172,767
Operating revenues |  | 516,737 | 471,870
Profit (loss) for the year |  | ₩ 13,115 | ₩ (8,692)
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 Inc.
Type of Business | Opening services of fixed line |  |
Location | Korea |  |
Controlling percentage ownership | 67.30% | 67.30% |
Closing month | December |  |
Total assets | ₩ 63,760 | ₩ 74,673 | ₩ 59,341
Total liabilities | 55,360 | 65,820 | 54,070
Operating revenues | 242,119 | 252,304 | 231,602
Profit (loss) for the year | ₩ 1,212 | ₩ 3,227 | ₩ 1,128
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 Inc.
Type of Business | Opening services of fixed line |  |
Location | Korea |  |
Controlling percentage ownership | 77.30% | 77.30% |
Closing month | December |  |
Total assets | ₩ 71,576 | ₩ 80,450 | ₩ 62,513
Total liabilities | 58,745 | 66,479 | 52,695
Operating revenues | 291,170 | 301,720 | 271,174
Profit (loss) for the year | ₩ 1,354 | ₩ 3,067 | ₩ 1,430
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 | ₩ 6,352,878 | ₩ 5,666,075 | ₩ 3,933,427
Total liabilities | 4,722,432 | 4,109,200 | 2,481,004
Operating revenues | 4,027,450 | 3,897,090 | 3,580,970
Profit (loss) for the year | ₩ 76,545 | ₩ 148,341 | ₩ 120,308
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% | 69.70% |
Closing month | December |  |
H&C Network [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | H&C Network | H&C Network | H&C Network Co., Ltd.
Type of Business | Call center for financial sectors |  |
Location | Korea |  |
Controlling percentage ownership | 100.00% | 100.00% |
Closing month | December |  |
Total assets | ₩ 81,107 | ₩ 82,737 | ₩ 88,616
Total liabilities | 4,863 | 6,640 | 4,993
Operating revenues | 27,205 | 27,392 | 227,604
Profit (loss) for the year | ₩ 1,814 | ₩ 992 | ₩ 11,995
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 | 63.90% | 61.30% |
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% | 95.60% |
Closing month | December |  |
Total assets | ₩ 393,667 | ₩ 401,932 | ₩ 341,358
Total liabilities | 202,067 | 228,474 | 199,831
Operating revenues | 727,477 | 723,161 | 632,899
Profit (loss) for the year | ₩ 33,971 | ₩ 30,941 | ₩ 21,464
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 | ₩ 258,477 | ₩ 255,310 | ₩ 241,377
Total liabilities | 209,075 | 204,336 | 203,051
Operating revenues | 695,856 | 730,802 | 710,634
Profit (loss) for the year | ₩ 3,783 | ₩ 8,105 | ₩ 3,496
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 | ₩ 50,750 | ₩ 38,684 | ₩ 32,511
Total liabilities | 28,431 | 22,553 | 25,402
Operating revenues | 101,428 | 83,085 | 70,212
Profit (loss) for the year | ₩ 8,457 | ₩ 4,607 | ₩ 1,637
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 | ₩ 46,839 | ₩ 42,011 | ₩ 36,741
Total liabilities | 26,012 | 25,416 | 26,053
Operating revenues | 101,422 | 83,330 | 71,940
Profit (loss) for the year | ₩ 5,749 | ₩ 5,035 | ₩ 2,016
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 | ₩ 1,220,842 | ₩ 1,359,166 | ₩ 1,275,645
Total liabilities | 479,369 | 503,679 | 469,694
Operating revenues | 1,034,342 | 1,038,468 | 772,950
Profit (loss) for the year | ₩ (109,407) | ₩ 20,941 | ₩ 62,309
KT Skylife [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT Skylife |  |
Type of Business | Satellite TV |  |
Location | Korea |  |
Controlling percentage ownership | 50.60% | 50.20% |
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 | ₩ 2,746,546 | ₩ 2,480,333 | ₩ 2,370,940
Total liabilities | 1,121,970 | 833,842 | 791,884
Operating revenues | 511,018 | 478,188 | 577,578
Profit (loss) for the year | ₩ 871 | ₩ 58,780 | ₩ 213,203
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 |  |
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. | 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 | ₩ 7,760 | ₩ 12,059 | ₩ 11,464
Total liabilities | 1,501 | 1,596 | 1,560
Operating revenues | 4,346 | 4,323 | 4,423
Profit (loss) for the year | ₩ 648 | ₩ 451 | ₩ 553
KT Sat Co., Ltd. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | 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 | ₩ 699,607 | ₩ 677,980 |
Total liabilities | 88,524 | 89,644 |
Operating revenues | 182,274 | 185,313 |
Profit (loss) for the year | ₩ 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% | 44.00% |
Closing month | December |  |
Total assets | ₩ 513,311 | ₩ 516,945 | ₩ 490,394
Total liabilities | 262,336 | 275,730 | 268,618
Operating revenues | 147,934 | 153,210 | 125,876
Profit (loss) for the year | ₩ 17,703 | ₩ 27,691 | ₩ 27,120
KT Sports Co., Ltd. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | 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 | ₩ 26,615 | ₩ 28,220 |
Total liabilities | 11,299 | 15,461 |
Operating revenues | 66,309 | 65,350 |
Profit (loss) for the year | ₩ (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 | ₩ 5,558 | ₩ 15,718 | ₩ 14,985
Total liabilities | 1,772 | 277 | 278
Operating revenues | 534 | 1,040 | 253
Profit (loss) for the year | ₩ (992) | ₩ 735 | ₩ (30)
KT-Michigan global contents fund [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary |  | KT-Michigan Global Content Fund | KT-Michigan Global Contents Fund
Total assets |  | ₩ 2,371 | ₩ 3,552
Total liabilities |  | 27 | 112
Operating revenues |  | 33 | 13,592
Profit (loss) for the year |  | ₩ (1,095) | ₩ 10,032
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 | ₩ 434,900 | ₩ 419,726 | ₩ 416,750
Total liabilities | 234,850 | 228,618 | 234,172
Operating revenues | 1,035,911 | 1,031,010 | 968,499
Profit (loss) for the year | ₩ 15,804 | ₩ 17,634 | ₩ 19,034
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 | ₩ 447,609 | ₩ 396,208 | ₩ 369,361
Total liabilities | 243,519 | 199,204 | 177,619
Operating revenues | 593,162 | 536,229 | 487,801
Profit (loss) for the year | ₩ 13,922 | ₩ 15,917 | ₩ 24,944
KT M Mobile Co., Ltd. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | 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 | ₩ 176,838 | ₩ 152,114 |
Total liabilities | 69,317 | 49,816 |
Operating revenues | 301,049 | 262,918 |
Profit (loss) for the year | ₩ 5,605 | ₩ 4,731 |
Next Connect PFV Inc. [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | Next Connect PFV |  | Next Connect PFV Inc.
Total assets | ₩ 946,687 |  | ₩ 518,441
Total liabilities | 629,809 |  | 167,963
Operating revenues | 0 |  | 0
Profit (loss) for the year | ₩ (29,889) |  | ₩ (6,519)
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 | ₩ 83,638 | ₩ 103,354 | ₩ 87,366
Total liabilities | 57,420 | 79,182 | 66,108
Operating revenues | 24,976 | 15,136 | 21,040
Profit (loss) for the year | ₩ 2,180 | ₩ 2,840 | ₩ (697)
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 |  |
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 | ₩ 134,847 | ₩ 126,721 | ₩ 125,860
Total liabilities | 313,787 | 267,369 | 236,389
Operating revenues | 26,788 | 30,834 | 23,328
Profit (loss) for the year | ₩ (57,628) | ₩ (27,467) | ₩ (28,770)
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 | ₩ 10,763 | ₩ 10,972 | ₩ 11,539
Total liabilities | 1,983 | 905 | 2,812
Operating revenues | 8,287 | 8,049 | 6,942
Profit (loss) for the year | ₩ 128 | ₩ 1,274 | ₩ 823
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 | ₩ 2,015 | ₩ 1,888 | ₩ 1,474
Total liabilities | 3,341 | 3,141 | 2,633
Operating revenues | 2,793 | 3,263 | 1,298
Profit (loss) for the year | ₩ (110) | ₩ 226 | ₩ (142)
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 | ₩ 48,483 | ₩ 42,691 | ₩ 35,904
Total liabilities | 22,632 | 21,645 | 22,088
Operating revenues | 30,350 | 27,030 | 11,960
Profit (loss) for the year | ₩ 7,723 | ₩ 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 | ₩ 6,013 | ₩ 5,945 | ₩ 4,884
Total liabilities | 701 | 843 | 101
Operating revenues | 8,928 | 8,070 | 6,508
Profit (loss) for the year | ₩ 133 | ₩ 37 | ₩ 201
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 | ₩ 11,142 | ₩ 10,505 | ₩ 6,613
Total liabilities | 5,121 | 4,768 | 1,346
Operating revenues | 19,373 | 20,413 | 18,825
Profit (loss) for the year | ₩ 143 | ₩ 51 | ₩ 1,313
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 |
Type of Business | Manufacturing |  |
Location | Korea |  |
Controlling percentage ownership | 100.00% | 100.00% |
Closing month | December |  |
Total assets | ₩ 8,073 | ₩ 6,984 |
Total liabilities | 2,715 | 2,582 |
Operating revenues | 17,687 | 22,860 |
Profit (loss) for the year | ₩ 1,012 | ₩ 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. |  |
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. |  |
Type of Business | Telecommunication facility construction andmaintenance |  |
Location | Korea |  |
Controlling percentage ownership | 100.00% | 100.00% |
Closing month | December |  |
Total assets | ₩ 160,243 |  |
Total liabilities | 104,005 |  |
Operating revenues | 262,063 |  |
Profit (loss) for the year | ₩ 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 datacommunication construction business |  |
Location | Korea |  |
Controlling percentage ownership | 90.90% | 90.90% |
Closing month | December |  |
Total assets | ₩ 989,187 | ₩ 987,270 | ₩ 648,534
Total liabilities | 259,413 | 268,911 | 276,933
Operating revenues | 542,955 | 723,580 | 90,047
Profit (loss) for the year | ₩ 13,507 | ₩ 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. | Lolab Co., Ltd.
Type of Business | Truck transportation and truckingarrangement business |  |
Location | Korea |  |
Controlling percentage ownership | 79.80% | 79.80% |
Closing month | December |  |
Total assets | ₩ 42,744 | ₩ 35,091 | ₩ 26,726
Total liabilities | 37,838 | 17,247 | 897
Operating revenues | 173,035 | 74,881 | 2,107
Profit (loss) for the year | ₩ (12,938) | ₩ (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 | 30.20% | 38.60% |
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 | 57.60% | 57.60% |
Closing month | December |  |
Total assets | ₩ 117,009 | ₩ 240,721 | ₩ 240,331
Total liabilities | 90,392 | 88,640 | 80,597
Operating revenues | 87,865 | 78,815 | 15,157
Profit (loss) for the year | ₩ (124,850) | ₩ (23,957) | ₩ (6,355)
Epsilon Global Communications Pte. Ltd [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | Epsilon Global CommunicationsPTE. 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 |  |
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 |  |
Nasmedia KT Alpha Future Growth Strategic Investment Fund [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | Nasmedia-KT Alpha Future GrowthStrategic Investment Fund |  |
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 | ₩ 48,381 | ₩ 44,861 | ₩ 32,338
Total liabilities | 12,374 | 15,777 | 9,742
Operating revenues | 45,035 | 47,203 | 6,968
Profit (loss) for the year | ₩ 7,352 | ₩ 6,035 | ₩ 1,037
Altimidia B.V. (formerly Alticast B.V.) [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | Altimidia B.V.(formerly 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 |  |
Altimidia Vietnam (formerly Alticast Company Limited) [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | Altimidia Vietnam(formerly Alticast Company Limited) |  |
Type of Business | Software development and delivery |  |
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 |
Type of Business | Foreign investment business |  |
Location | Russia |  |
Controlling percentage ownership | 100.00% | 100.00% |
Closing month | December |  |
Total assets | ₩ 501 | ₩ 967 |
Total liabilities | 10 | 16 |
Operating revenues | 1 | 5 |
Profit (loss) for the year | ₩ (378) | ₩ (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% | 75.00% |
Closing month | December |  |
KTP SERVICES INC. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | 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 | ₩ 2,967 | ₩ 3,832 |
Total liabilities | 919 | 2,044 |
Operating revenues | 671 | 776 |
Profit (loss) for the year | ₩ 235 | ₩ (255) |
KT Cloud Co., Ltd. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT Cloud Co., Ltd. | kt cloud Co., Ltd. |
Type of Business | Information and communications development |  |
Location | Korea |  |
Controlling percentage ownership | 92.70% | 100.00% |
Closing month | December |  |
Total assets | ₩ 1,983,972 | ₩ 1,348,684 |
Total liabilities | 503,241 | 245,872 |
Operating revenues | 679,825 | 432,118 |
Profit (loss) for the year | ₩ 63,956 | ₩ 14,712 |
KT DX Vietnam Company Limited [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | 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 | ₩ 1,694 | ₩ 1,815 |
Total liabilities | 102 | 6 |
Operating revenues | 82 | 0 |
Profit (loss) for the year | ₩ (207) | ₩ 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% | 80.90% |
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% | 67.00% |
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 | 42.60% | 41.20% |
Closing month | December |  |
open cloud lab Co., Ltd (formerly SPARK AND ASSOCIATES INC.) [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | open cloud lab Co., Ltd(formerly SPARK AND ASSOCIATES INC.) |  |
Type of Business | IT consulting service and Telecommunication equipment sales |  |
Location | Korea |  |
Controlling percentage ownership | 100.00% | 100.00% |
Closing month | December |  |
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)
KT Sat Inc. [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary |  |  | KT Sat Inc.
Total assets |  |  | ₩ 593,616
Total liabilities |  |  | 34,169
Operating revenues |  |  | 174,750
Profit (loss) for the year |  |  | ₩ 20,830
KT Hopemate [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary |  |  | KT Hopemate
Total assets |  |  | ₩ 6,311
Total liabilities |  |  | 2,978
Operating revenues |  |  | 12,538
Profit (loss) for the year |  |  | ₩ 116
KT M mobile Inc. [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary |  |  | KT M Mobile Inc.
Total assets |  |  | ₩ 144,175
Total liabilities |  |  | 40,749
Operating revenues |  |  | 204,641
Profit (loss) for the year |  |  | ₩ 5,918
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 |  | ₩ 141,463 | ₩ 185,850
Total liabilities |  | 89,853 | 144,832
Operating revenues |  | 258,435 | 284,998
Profit (loss) for the year |  | ₩ 10,302 | ₩ 366
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
Next Connect PFV [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | 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 |  | ₩ 624,734 |
Total liabilities |  | 277,967 |
Operating revenues |  | 3 |
Profit (loss) for the year |  | ₩ (3,712) |
KD Living, Inc. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KD Living, Inc |  |
Type of Business | Residential building management |  |
Location | Korea |  |
Controlling percentage ownership | 100.00% |  |
Closing month | December |  |
KT Healthcare Vina Co., Ltd. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | KT Healthcare Vina Co., Ltd. |  |
Type of Business | Medical service |  |
Location | Vietnam |  |
Controlling percentage ownership | 100.00% |  |
Closing month | December |  |
Total assets | ₩ 12,730 |  |
Total liabilities | 439 |  |
Operating revenues | 0 |  |
Profit (loss) for the year | ₩ (721) |  |
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 |  |
Type of Business | Real estate management |  |
Location | Korea |  |
Controlling percentage ownership | 6.50% |  |
Closing month | December |  |
Total assets | ₩ 80,266 |  |
Total liabilities | 50,693 |  |
Operating revenues | 4,682 |  |
Profit (loss) for the year | ₩ (1,037) |  |
AQUA RETAIL VIETNAM COMPANY LIMITED [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Subsidiary | AQUA RETAIL VIETNAM COMPANY LIMITED |  |
Type of Business | E-voucher issuance and trading business |  |
Location | Vietnam |  |
Controlling percentage ownership | 100.00% |  |
Closing month | December |  |
Total assets | ₩ 1,202 |  |
Total liabilities | 62 |  |
Operating revenues | 16 |  |
Profit (loss) for the year | ₩ (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% |  |
Closing month | December |  |

X
- Definition The amount of a present economic resource controlled by the entity as a result of past events. Economic resource is a right that has the potential to produce economic benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2023-01-01 -Paragraph 93 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2023-en-r&anchor=para_93_a&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2023-01-01 -Paragraph 28 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2023-en-r&anchor=para_28_c&doctype=Standard -URIDate 2023-03-23 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2023-01-01 -Paragraph 93 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2023-en-r&anchor=para_93_b&doctype=Standard -URIDate 2023-03-23 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2023-01-01 -Paragraph 93 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2023-en-r&anchor=para_93_e&doctype=Standard -URIDate 2023-03-23 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2023-01-01 -Paragraph 23 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2023-en-r&anchor=para_23&doctype=Standard -URIDate 2023-03-23 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_55&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_Assets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The country in which a subsidiary of the entity is incorporated. [Refer: Subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2023-01-01 -Paragraph 16 -Subparagraph b -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2023-en-r&anchor=para_16_b_ii&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2023-01-01 -Paragraph 17 -Subparagraph b -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2023-en-r&anchor=para_17_b_ii&doctype=Standard -URIDate 2023-03-23 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2023-01-01 -Paragraph 12 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2023-en-r&anchor=para_12_b&doctype=Standard -URIDate 2023-03-23 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2023-01-01 -Paragraph 19B -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2023-en-r&anchor=para_19B_b&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_CountryOfIncorporationOrResidenceOfSubsidiary
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The description of the nature of the entity's operations and principal activities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 138 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_138_b&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_DescriptionOfNatureOfEntitysOperationsAndPrincipalActivities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of a present obligation of the entity to transfer an economic resource as a result of past events. Economic resource is a right that has the potential to produce economic benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2023-01-01 -Paragraph 93 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2023-en-r&anchor=para_93_a&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2023-01-01 -Paragraph 93 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2023-en-r&anchor=para_93_b&doctype=Standard -URIDate 2023-03-23 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2023-01-01 -Paragraph 93 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2023-en-r&anchor=para_93_e&doctype=Standard -URIDate 2023-03-23 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2023-01-01 -Paragraph 28 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2023-en-r&anchor=para_28_d&doctype=Standard -URIDate 2023-03-23 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2023-01-01 -Paragraph 23 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2023-en-r&anchor=para_23&doctype=Standard -URIDate 2023-03-23 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_55&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_Liabilities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The name of a subsidiary. [Refer: Subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2023-01-01 -Paragraph 17 -Subparagraph b -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2023-en-r&anchor=para_17_b_i&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2023-01-01 -Paragraph 16 -Subparagraph b -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2023-en-r&anchor=para_16_b_i&doctype=Standard -URIDate 2023-03-23 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2023-01-01 -Paragraph 12 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2023-en-r&anchor=para_12_a&doctype=Standard -URIDate 2023-03-23 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2023-01-01 -Paragraph 19B -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2023-en-r&anchor=para_19B_a&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_NameOfSubsidiary
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The total of income less expenses from continuing and discontinued operations, excluding the components of other comprehensive income. [Refer: Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2023-01-01 -Paragraph 18 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2023-en-r&anchor=para_18_b&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 1 -IssueDate 2023-01-01 -Paragraph 32 -Subparagraph a -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=1&code=ifrs-tx-2023-en-r&anchor=para_32_a_ii&doctype=Standard -URIDate 2023-03-23 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 1 -IssueDate 2023-01-01 -Paragraph 24 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=1&code=ifrs-tx-2023-en-r&anchor=para_24_b&doctype=Standard -URIDate 2023-03-23 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2023-01-01 -Paragraph 28 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2023-en-r&anchor=para_28_b&doctype=Standard -URIDate 2023-03-23 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2023-01-01 -Paragraph 23 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2023-en-r&anchor=para_23&doctype=Standard -URIDate 2023-03-23 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 12 -IssueDate 2023-01-01 -Paragraph B10 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2023-en-r&anchor=para_B10_b&doctype=Appendix&subtype=B -URIDate 2023-03-23 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 17 -IssueDate 2023-01-01 -Paragraph 113 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2023-en-r&anchor=para_113_b&doctype=Standard -URIDate 2023-03-23 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 81A -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_81A_a&doctype=Standard -URIDate 2023-03-23 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 106 -Subparagraph d -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_106_d_i&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_ProfitLoss
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The proportion of ownership interest in a subsidiary attributable to the entity. [Refer: Subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2023-01-01 -Paragraph 17 -Subparagraph b -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2023-en-r&anchor=para_17_b_iii&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2023-01-01 -Paragraph 16 -Subparagraph b -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2023-en-r&anchor=para_16_b_iii&doctype=Standard -URIDate 2023-03-23 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2023-01-01 -Paragraph 19B -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2023-en-r&anchor=para_19B_c&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_ProportionOfOwnershipInterestInSubsidiary
Namespace Prefix: | ifrs-full_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The income arising in the course of an entity's ordinary activities. Income is increases in assets, or decreases in liabilities, that result in increases in equity, other than those relating to contributions from holders of equity claims. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2023-01-01 -Paragraph 28 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2023-en-r&anchor=para_28_a&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2023-01-01 -Paragraph 23 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2023-en-r&anchor=para_23_a&doctype=Standard -URIDate 2023-03-23 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2023-01-01 -Paragraph 32 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2023-en-r&anchor=para_32&doctype=Standard -URIDate 2023-03-23 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 5 -IssueDate 2023-01-01 -Paragraph 33 -Subparagraph b -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=5&code=ifrs-tx-2023-en-r&anchor=para_33_b_i&doctype=Standard -URIDate 2023-03-23 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2023-01-01 -Paragraph 33 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2023-en-r&anchor=para_33_a&doctype=Standard -URIDate 2023-03-23 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2023-01-01 -Paragraph 34 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2023-en-r&anchor=para_34&doctype=Standard -URIDate 2023-03-23 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2023-01-01 -Paragraph B12 -Subparagraph b -Clause v -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2023-en-r&anchor=para_B12_b_v&doctype=Appendix&subtype=B -URIDate 2023-03-23 Reference 8: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 12 -IssueDate 2023-01-01 -Paragraph B10 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2023-en-r&anchor=para_B10_b&doctype=Appendix&subtype=B -URIDate 2023-03-23 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 82 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_82_a&doctype=Standard -URIDate 2023-03-23 Reference 10: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 103 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_103&doctype=Standard -URIDate 2023-03-23 Reference 11: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 102 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_102&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_Revenue
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Closing month of subsidiary. + References No definition available. + Details
Name: | kt_ClosingMonthOfSubsidiary
Namespace Prefix: | kt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_KtLinkusCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_KtSubmarineCo.LtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_KtTelecopCo.LtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_KtAlphaCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_KtAlphaCoLtdKtHitelCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_KtServiceBukbuCo.Ltd.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_KtServiceNambuCo.LtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_KtCommerceInc.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_KtStrategicInvestmentFundNumberThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_KtStrategicInvestmentFundNumberFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_KtStrategicInvestmentFundNumberFiveMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_BcVpStrategicInvestmentFundNumberOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_BcCardCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_VpIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_HAndCNetworkMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_BcCardChinaCo.Ltd.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_InitechCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_SmartroCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_KtdsCo.LtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_KtMAndSCo.LtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_GenieMusicCorporationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_KtMosBukbuCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_KtMosNambuCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_KTSkylifeCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_KtSkylifeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_SkylifeTvCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_KtEstateIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_KtInvestmentManagementInc.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_NEXRCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_KtGdhCo.Ltd.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_KtSatCo.Ltd.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_NasmediaCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_KtSportsCo.Ltd.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_KtMusicContentsFundNoTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_KtMichiganGlobalContentsFundMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_KtcsCorporationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_KTISCorporationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_KtMMobileCo.Ltd.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_NextConnectPfvIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_KtInvestmentCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_PlaydCo.Ltd.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_KtRwandaNetworksLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_AosLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_KtJapanCo.Ltd.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_EastTelecomLlcMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_KtAmericaInc.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_Pt.BcCardAsiaPacificMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_KtHongKongTelecommunicationsCo.LtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_KoreaTelecomSingaporePteLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_TexnoprosistemLlcMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_NasmediaThailandCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_KtHuimangjieumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_KrealtyRentalHousingReit3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_StorywizCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_KtEngineeringCo.Ltd.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_KtStudioGenieCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_KhsCorporationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_LolabCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_HcnCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_MillieSeojaeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_KtEsPteLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_EpsilonGlobalCommunicationsPte.LtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_EpsilonTelecommunicationsSpPteLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_EpsilonTelecommunicationsUsPteLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_EpsilonTelecommunicationsLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_EpsilonTelecommunicationsHkLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_EpsilonUsIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_EpsilonTelecommunicationsBgEoodMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_KtStrategicInvestmentFundMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_NasmediaKtAlphaFutureGrowthStrategicInvestmentFundMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_AltimediaCorporationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_AlticastBVMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_BccardVietnamLtd.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_AltimidiaVietnamFormerlyAlticastCompanyLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_KtRusLlcMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_HangangRealEstateInvestmentTrustNo.24Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_KtpServicesInc.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_KtCloudCo.Ltd.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_KtDxVietnamCompanyLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_PocheonJeonggyoriDevelopmentCo.Ltd.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_PtCraniumRoyalAditamaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_JuiceInc.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_SparkAndAssociatesInc.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_KtSportsIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_KtSatIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_KtHopemateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_KtMMobileIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_KtEngineeringCoLtdktEngcoreCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_KtPhilippinesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_NextConnectPfvMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_KdLivingInc.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_KtHealthcareVinaCompanyLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_KrealtyQualifiedPrivateRealEstateInvestmentTrustNumberOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_AquaRetailVietnamCompanyLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=kt_KRealtyQualifiedPrivateRealEstateInvestmentTrustNumberFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |