KT (KT) 20-F 30 Apr 24 2023 FY Annual report (foreign) Financial data

Cover Page

Cover Page	12 Months Ended
	Dec. 31, 2023 shares
Document Information [Line Items]
Document Type	20-F
Amendment Flag	false
Document Fiscal Year Focus	2023
Document Period End Date	Dec. 31, 2023
Document Fiscal Period Focus	FY
Entity Registrant Name	KT Corporation
Entity Central Index Key	0000892450
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding	246,413,422
Entity Voluntary Filers	No
Entity Address, Country	KR
ICFR Auditor Attestation Flag	true
Entity Interactive Data Current	Yes
Document Registration Statement	false
Document Annual Report	true
Document Transition Report	false
Document Shell Company Report	false
Document Accounting Standard	International Financial Reporting Standards
Entity File Number	1-14926
Entity Incorporation, State or Country Code	M5
Entity Address, Address Line One	KT Gwanghwamun Building East 33
Entity Address, Address Line Two	Jong-ro 3-Gil
Entity Address, City or Town	Jongno-gu
Entity Address, Postal Zip Code	03155
Auditor Name	Deloitte Anjin LLC
Auditor Firm ID	1098
Auditor Location	Seoul, Korea
Document Financial Statement Error Correction [Flag]	false
Samil PricewaterhouseCoopers [Member]
Document Information [Line Items]
Auditor Name	Samil PricewaterhouseCoopers
Auditor Firm ID	1103
Auditor Location	Seoul, Korea
Business Contact [Member]
Document Information [Line Items]
Entity Address, Country	KR
City Area Code	82
Local Phone Number	2-3495-3557
Entity Address, Address Line One	KT Gwanghwamun Building East 33
Entity Address, Address Line Two	Jong-ro 3-Gil
Entity Address, City or Town	Jongno-gu
Entity Address, Postal Zip Code	03155
Contact Personnel Name	Min Jang
Contact Personnel Email Address	ktir@kt.com
ADS [Member]
Document Information [Line Items]
Trading Symbol	KT
Title of 12(b) Security	American Depositary Shares
Security Exchange Name	NYSE
Ordinary shares [member]
Document Information [Line Items]
Trading Symbol	KT
Title of 12(b) Security	Ordinary share
Security Exchange Name	NYSE

Consolidated Statements of Fina

Consolidated Statements of Financial Position - KRW (₩) ₩ in Millions	Dec. 31, 2023	Dec. 31, 2022
Current assets
Cash and cash equivalents	₩ 2,879,554	₩ 2,449,062
Trade and other receivables, net	7,170,289	6,098,072
Other financial assets	1,440,200	1,322,452
Current income tax assets	3,299	1,543
Inventories, net	988,351	717,673
Other current assets	2,112,553	2,101,212
Total current assets	14,594,246	12,690,014
Non-current assets
Trade and other receivables, net	1,404,168	1,491,046
Other financial assets	2,724,761	2,501,484
Property and equipment, net	14,872,079	14,772,179
Right-of-use assets	1,304,963	1,280,334
Investment properties, net	2,198,135	1,933,358
Intangible assets, net	2,533,861	3,129,833
Investments in associates and joint ventures	1,556,889	1,480,722
Deferred income tax assets	614,500	579,090
Net defined benefit assets	160,748	311,142
Other non-current assets	827,297	820,608
Total non-current assets	28,197,401	28,299,796
Total assets	42,791,647	40,989,810
Current liabilities
Trade and other payables	8,054,922	7,333,165
Borrowings	3,058,564	1,827,042
Other financial liabilities	322,099	8,791
Current income tax liabilities	236,463	232,382
Provisions	115,209	109,133
Deferred revenue	51,537	55,737
Other current liabilities	1,408,843	1,133,018
Total current liabilities	13,247,637	10,699,268
Non-current liabilities
Trade and other payables	819,558	1,064,099
Borrowings	7,159,601	8,179,643
Other financial liabilities	753,739	412,650
Defined benefit liabilities, net	63,616	51,654
Provisions	107,014	91,233
Deferred revenue	153,563	165,186
Deferred income tax liabilities	994,330	967,650
Other non-current liabilities	950,015	945,731
Total non-current liabilities	11,001,436	11,877,846
Total liabilities	24,249,073	22,577,114
Equity
Share capital	1,564,499	1,564,499
Share premium	1,440,258	1,440,258
Retained earnings	14,475,867	14,255,316
Accumulated other comprehensive income(loss)	52,407	(77,776)
Other components of equity	(802,418)	(572,152)
Equity attributable to owners of the Controlling Company	16,730,614	16,610,145
Non-controlling interest	1,811,961	1,802,551
Total equity	18,542,575	18,412,696
Total liabilities and equity	₩ 42,791,647	₩ 40,989,810

Consolidated Statements of Prof

Consolidated Statements of Profit or Loss - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Profit or loss [abstract]
Operating revenue and other Income	₩ 26,595,245	₩ 26,234,206	₩ 25,205,659
Revenue	26,287,201	25,638,855	24,898,005
Other income	308,044	595,351	307,654
Operating expenses	25,166,796	24,266,049	23,506,262
Operating profit	1,428,449	1,968,157	1,699,397
Finance income	486,277	690,428	726,283
Finance costs	(568,682)	(749,908)	(563,330)
Share of net profits of associates and joint ventures	(43,424)	(17,285)	116,061
Profit before income tax	1,302,620	1,891,392	1,978,411
Income tax expense	330,438	505,757	519,016
Profit for the year	972,182	1,385,635	1,459,395
Profit for the year attributable to:
Profit (loss) for the year attributable to Owners of the Controlling Company	993,325	1,260,470	1,356,878
Profit (loss) for the year attributable to Non-controlling interest	₩ (21,143)	₩ 125,165	₩ 102,517
Earnings per share attributable to the equity holders of the Controlling Company during the year (in Korean won):
Basic earnings per share	₩ 3,982	₩ 5,200	₩ 5,759
Diluted earnings per share	₩ 3,977	₩ 5,196	₩ 5,747

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of comprehensive income [abstract]
Profit for the year	₩ 972,182	₩ 1,385,635	₩ 1,459,395
Other comprehensive income Items that will not be reclassified to profit or loss:
Remeasurements of the net defined benefit liability	(137,465)	181,429	55,822
Shares of remeasurement gain (loss) of associates and joint ventures	(105)	(332)	(1,596)
Gain (loss) on valuation of equity instruments at fair value through other comprehensive income	121,271	(141,944)	144,890
Other comprehensive income, Items that may be subsequently reclassified to profit or loss:
Gain(loss) on valuation of debt instruments at fair value through other comprehensive income	534	(16,630)	(15,110)
Valuation gain (loss) on cash flow hedge	15,329	64,091	141,855
Other comprehensive income (loss) from cash flow hedges reclassified to profit (loss)	(37,942)	(95,421)	(136,583)
Share of other comprehensive income (loss) from associates and joint ventures	21,595	(10,851)	(24,216)
Exchange differences on translation of foreign operations	24,230	17,464	505
Total other comprehensive income	7,447	(2,194)	165,567
Total comprehensive income for the year	979,629	1,383,441	1,624,962
Total comprehensive income for the year attributable to:
Owners of the Controlling Company	996,999	1,234,651	1,510,373
Non-controlling interest	₩ (17,370)	₩ 148,790	₩ 114,589

Consolidated Statements of Chan

Consolidated Statements of Changes in Equity - KRW (₩) ₩ in Millions	Total	Share capital [member]	Share premium [member]	Retained earnings [member]	Accumulated other comprehensive income [member]	Other components of equity [member]	Total attributable to owners of the Controlling Company [member]	Non-controlling interest [member]
Beginning balance at Dec. 31, 2020	₩ 15,551,433	₩ 1,564,499	₩ 1,440,258	₩ 12,155,420	₩ 86,051	₩ (1,234,784)	₩ 14,011,444	₩ 1,539,989
Comprehensive income
Profit for the year	1,459,395			1,356,878			1,356,878	102,517
Remeasurements of net defined benefit liabilities	55,822			47,348			47,348	8,474
Share of gain(loss) on remeasurements of associates and joint ventures	(1,596)			(1,559)			(1,559)	(37)
Share of other comprehensive income (loss) of associates and joint ventures	(24,216)				(19,718)		(19,718)	(4,498)
Valuation gain (loss) on cash flow hedge	5,272				5,222		5,222	50
Gain (Loss) on valuation of financial instruments at fair value through other comprehensive income	129,780			76,288	47,247		123,535	6,245
Exchange differences on translation of foreign operations	505				(1,333)		(1,333)	1,838
Total comprehensive income for the year	1,624,962			1,478,955	31,418		1,510,373	114,589
Transactions with owners
Dividends paid by the Controlling Company	(326,487)			(326,487)			(326,487)
Dividends paid to non-controlling interest of subsidiaries	(23,762)							(23,762)
Acquisition and disposition of businesses	(17,566)							(17,566)
Changes in ownership interest in subsidiaries	(6,823)					15,797	15,797	(22,620)
Appropriations of loss on disposal of treasury stock				(20,498)		20,498
Acquisition of treasury stock	(190,105)					(190,105)	(190,105)
Disposal of treasury stock	50,954					50,954	50,954
Recognition of the obligation to purchase its own equity	(101,829)					(101,829)	(101,829)
Others	6,384					6,389	6,389	(5)
Subtotal	(609,234)			(346,985)		(198,296)	(545,281)	(63,953)
Ending balance at Dec. 31, 2021	16,567,161	1,564,499	1,440,258	13,287,390	117,469	(1,433,080)	14,976,536	1,590,625
Comprehensive income
Profit for the year	1,385,635			1,260,470			1,260,470	125,165
Remeasurements of net defined benefit liabilities	181,429			165,524			165,524	15,905
Share of gain(loss) on remeasurements of associates and joint ventures	(332)			(189)			(189)	(143)
Share of other comprehensive income (loss) of associates and joint ventures	(10,851)				(8,291)		(8,291)	(2,560)
Valuation gain (loss) on cash flow hedge	(31,330)				(32,140)		(32,140)	810
Gain (Loss) on valuation of financial instruments at fair value through other comprehensive income	(158,574)			4,091	(160,785)		(156,694)	(1,880)
Exchange differences on translation of foreign operations	17,464				5,971		5,971	11,493
Total comprehensive income for the year	1,383,441			1,429,896	(195,245)		1,234,651	148,790
Transactions with owners
Dividends paid by the Controlling Company	(450,393)			(450,393)			(450,393)
Dividends paid to non-controlling interest of subsidiaries	(26,407)							(26,407)
Acquisition and disposition of businesses	3,152							3,152
Changes in ownership interest in subsidiaries	121,619					88,924	88,924	32,695
Appropriations of loss on disposal of treasury stock				(11,577)		11,577
Disposal of treasury stock	763,081					763,081	763,081
Conversion of redeemable convertible preferred shares of subsidiaries to common shares	51,476						0	51,476
Others	(434)					(2,654)	(2,654)	2,220
Subtotal	462,094			(461,970)		860,928	398,958	63,136
Ending balance at Dec. 31, 2022	18,412,696	1,564,499	1,440,258	14,255,316	(77,776)	(572,152)	16,610,145	1,802,551
Comprehensive income
Profit for the year	972,182			993,325			993,325	(21,143)
Remeasurements of net defined benefit liabilities	(137,465)			(126,613)			(126,613)	(10,852)
Share of gain(loss) on remeasurements of associates and joint ventures	(105)			(118)			(118)	13
Share of other comprehensive income (loss) of associates and joint ventures	21,595				15,775		15,775	5,820
Valuation gain (loss) on cash flow hedge	(22,613)				(22,252)		(22,252)	(361)
Gain (Loss) on valuation of financial instruments at fair value through other comprehensive income	121,805			222	126,028		126,250	(4,445)
Exchange differences on translation of foreign operations	24,230				10,632		10,632	13,598
Total comprehensive income for the year	979,629			866,816	130,183		996,999	(17,370)
Transactions with owners
Dividends paid by the Controlling Company	(501,844)			(501,844)			(501,844)	0
Dividends paid to non-controlling interest of subsidiaries	(24,964)							(24,964)
Acquisition and disposition of businesses	(79,134)							(79,134)
Changes in ownership interest in subsidiaries	345,367					216,841	216,841	128,526
Appropriations of loss on disposal of treasury stock				(44,421)		44,421
Acquisition of treasury stock	(300,243)					(300,243)	(300,243)
Disposal of treasury stock	4,463					4,463	4,463
Recognition of the obligation to purchase its own equity	(298,196)					(298,196)	(298,196)
Retirement of treasury stock				(100,000)		100,000
Others	4,800					2,448	2,448	2,352
Subtotal	(849,751)			(646,265)		(230,266)	(876,531)	26,780
Ending balance at Dec. 31, 2023	₩ 18,542,575	₩ 1,564,499	₩ 1,440,258	₩ 14,475,867	₩ 52,407	₩ (802,418)	₩ 16,730,614	₩ 1,811,961

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities
Cash generated from operations	₩ 5,747,195	₩ 3,835,879	₩ 5,829,607
Interest paid	(361,741)	(263,520)	(257,809)
Interest received	360,614	307,091	272,061
Dividends received	60,987	68,827	74,441
Income tax paid	(303,766)	(351,212)	(356,466)
Net cash inflow from operating activities	5,503,289	3,597,065	5,561,834
Cash flows from investing activities
Collection of loans	53,885	44,287	54,934
Loans granted	(37,771)	(43,694)	(54,128)
Disposal of financial assets at fair value through profit or loss	90,487	1,298,621	609,849
Disposal of financial assets at amortized cost	1,543,663	1,046,115	690,457
Disposal of financial assets at fair value through other comprehensive income	306	97,932	244,994
Disposal of assets held-for-sale	0	4,600	0
Disposal of investments in associates and joint ventures	6,890	34,828	10,880
Acquisition of investments in associates and joint ventures	(106,389)	(280,988)	(487,828)
Disposal of property and equipment, and investment properties	100,348	178,063	174,413
Acquisition of property and equipment, and investment properties	(3,692,972)	(3,439,857)	(3,495,021)
Acquisition of financial assets at fair value through profit or loss	(220,989)	(1,317,175)	(753,907)
Acquisition of financial assets at amortized cost	(1,875,525)	(1,450,442)	(623,924)
Acquisition of financial assets at fair value through other comprehensive income	(10,267)	(449,504)	(131,674)
Disposal of intangible assets	7,078	20,088	11,624
Disposal of right-of-use assets	529	97	318
Settlement of derivative assets and liabilities	4,888	0	0
Acquisition of intangible assets	(478,685)	(545,190)	(752,181)
Acquisition of right-of-use assets	(1,065)	(2,090)	(4,261)
Acquisition of businesses	(51,561)	(41,088)	(671,359)
Disposal of businesses	46,642	6,754	39,340
Net cash outflow from investing activities	(4,620,508)	(4,838,643)	(5,137,474)
Cash flows from financing activities
Proceeds from borrowings and debentures	5,381,231	4,234,570	2,899,567
Repayments of borrowings and debentures	(5,275,113)	(2,843,249)	(1,999,173)
Settlement of derivative assets and liabilities, net	48,183	35,083	(1,496)
Cash inflow from issuance of shares to NCI	632,776	125,066	67,693
Cash outflow from issuance of shares to NCI	(7,988)	(28,848)	(11,001)
Cash inflow from other financing activities	2,082	2,193	2,556
Dividends paid to shareholders	(526,826)	(476,800)	(350,334)
Acquisition of treasury stock	(300,086)	0	(193,626)
Cash outflow from other financing activities	0	0	(60,901)
Repayment of leases liabilities	(407,051)	(378,684)	(394,567)
Net cash outflow from financing activities	(452,792)	669,331	(41,282)
Effect of exchange rate change on cash and cash equivalents	503	1,717	1,890
Net increase (decrease) in cash and cash equivalents	430,492	(570,530)	384,968
Cash and cash equivalents at beginning of year	2,449,062	3,019,592	2,634,624
Cash and cash equivalents at end of year	₩ 2,879,554	₩ 2,449,062	₩ 3,019,592

General Information

General Information	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
General Information	1. General Information The consolidated financial statements have been prepared by KT Corporation, the “Controlling company” as defined under IFRS 10 Consolidated Financial Statements 1.1 The Controlling Company KT Corporation (the “Controlling Company”) commenced operations on January 1, 1982, when it spun off from the Korea Communications Commission (formerly the Korean Ministry of Information and Communications) to provide telecommunication services and to engage in the development of advanced communications services under the Act of Telecommunications of Korea. The headquarters are located in Seongnam City, Gyeonggi Province, Republic of Korea, and the address of its registered head office is 90, Buljeong-ro, Bundang-gu, Seongnam City, Gyeonggi Province. On October 1, 1997, upon the announcement of the Government-Investment Enterprises Management Basic Act and the Privatization Law, the Controlling Company became a government-funded institution under the Commercial Code of Korea. On December 23, 1998, the Controlling Company’s shares were listed on the Korea Exchange. On May 29, 1999, the Controlling Company issued 24,282,195 additional shares and issued American Depository Shares (ADS), which represents new shares and 20,813,311 government-owned shares, on the New York Stock Exchange. On July 2, 2001, additional ADS representing 55,502,161 government-owned shares were issued on the New York Stock Exchange. In 2002, the Controlling Company acquired the entire government-owned shares in accordance with the Korean government’s privatization plan. As of December 31, 2023, the Korean government does not own any shares in the Controlling Company. 1.2 Consolidated Subsidiaries (1) The consolidated subsidiaries as of December 31, 2022 and 2023, are as follows Controlling percentage 1 Subsidiary Type of business Location December 31, December 31, Closing KT Linkus Co., Ltd. Public telephone maintenance Korea 92.4% 92.4% December KT Telecop Co., Ltd. Security service Korea 86.8% 86.8% December KT Alpha Co., Ltd. 5 Data communication Korea 73.0% 73.0% December KT Service Bukbu Co., Ltd Opening services of fixed line Korea 67.3% 67.3% December KT Service Nambu Co., Ltd. Opening services of fixed line Korea 77.3% 77.3% December KT Commerce Inc. B2C, B2B service Korea 100.0% 100.0% December KT Strategic Investment Fund No.3 Investment fund Korea 100.0% 100.0% December KT Strategic Investment Fund No.4 Investment fund Korea 100.0% 100.0% December KT Strategic Investment Fund No.5 Investment fund Korea 100.0% 100.0% December BC-VP Strategic Investment Fund No.1 Investment fund Korea 100.0% 100.0% December BC Card Co., Ltd. Credit card business Korea 69.5% 69.5% December Controlling percentage 1 Subsidiary Type of business Location December 31, December 31, Closing VP Inc. 5 Payment security service for credit card, others Korea 69.7% 72.2% December H&C Network Call center for financial sectors Korea 100.0% 100.0% December BC Card China Co., Ltd. Software development and data processing China 100.0% 100.0% December INITECH Co., Ltd. 5 Internet banking ASP and security solutions Korea 61.3% 63.9% December Smartro Co., Ltd. VAN (Value Added Network) business Korea 64.5% 64.5% December KTDS Co., Ltd. 5 System integration and maintenance Korea 95.6% 91.6% December KT M&S Co., Ltd. PCS distribution Korea 100.0% 100.0% December GENIE Music Corporation 2 Online music production and distribution Korea 36.0% 36.0% December KT MOS Bukbu Co., Ltd. 5 Telecommunication facility maintenance Korea 100.0% 100.0% December KT MOS Nambu Co., Ltd. 5 Telecommunication facility maintenance Korea 98.4% 98.4% December KT Skylife 5 Satellite TV Korea 50.2% 50.6% December Skylife TV Co., Ltd. TV contents provider Korea 100.0% 100.0% December KT Estate Inc. Residential building development and supply Korea 100.0% 100.0% December KT Investment Management Inc. Asset management, real estate and consulting services Korea 100.0% 100.0% December NEXR Co., Ltd. Cloud system implementation Korea 100.0% 100.0% December KTGDH Co., Ltd. Data center development and related service Korea 100.0% 100.0% December KT Sat Co., Ltd. Satellite communication business Korea 100.0% 100.0% December Nasmedia Co., Ltd. 2,5 Solution provider and IPTV advertisement sales business Korea 44.0% 44.1% December KT Sports Co., Ltd. Management of sports teams Korea 100.0% 100.0% December KT Music Contents Fund No.2 Music and contents investment business Korea 100.0% 100.0% December KTCS Corporation 2,5 Database and online information provider Korea 34.1% 34.1% December KTIS Corporation 2,5 Database and online information provider Korea 33.3% 33.3% December KT M Mobile Co., Ltd. Special category telecommunications operator and sales of communication device Korea 100.0% 100.0% December KT Investment Co., Ltd. Financing business for new technology Korea 100.0% 100.0% December PlayD Co., Ltd. Advertising agency Korea 70.4% 70.4% December Next Connect PFV Residential building development and supply Korea 100.0% 100.0% December KT Rwanda Networks Ltd. Network installation and management Rwanda 51.0% 51.0% December AOS Ltd. System integration and maintenance Rwanda 51.0% 51.0% December KT Japan Co., Ltd. Foreign investment business and local counter work Japan 100.0% 100.0% December Controlling percentage 1 Subsidiary Type of business Location December 31, December 31, Closing East Telecom LLC Wireless/fixed line internet business Uzbekistan 91.6% 91.6% December KT America, Inc. Foreign investment business and local counter work USA 100.0% 100.0% December PT. BC Card Asia Pacific Software development and supply Indonesia 99.9% 99.9% December KT Hongkong Telecommunications Co., Ltd. Fixed line telecommunication business Hong Kong 100.0% 100.0% December Korea Telecom Singapore Pte. Ltd. Foreign investment business and local counter work Singapore 100.0% 100.0% December Texnoprosistem LLC Fixed line internet business Uzbekistan 100.0% 100.0% December Nasmedia Thailand Co., Ltd. Internet advertising solution Thailand 99.9% 99.9% December KT Huimangjieum Manufacturing Korea 100.0% 100.0% December K-REALTY RENTAL HOUSING REIT 3 Residential building Korea 88.6% 88.6% December Storywiz Co., Ltd. Contents and software development and supply Korea 100.0% 100.0% December KT Engineering Co., Ltd. Telecommunication facility construction and maintenance Korea 100.0% 100.0% December KT Studio Genie Co., Ltd. Data communication service and data communication construction business Korea 90.9% 90.9% December KHS Corporation Operation and maintenance of facilities Korea 100.0% 100.0% December Lolab Co., Ltd. Truck transportation and trucking arrangement business Korea 79.8% 79.8% December HCN Co., Ltd. Cable television service Korea 100.0% 100.0% December Millie Seojae 2 Book contents service Korea 38.6% 30.2% December KT ES Pte. Ltd. Foreign investment business Singapore 57.6% 57.6% December Epsilon Global Communications PTE. Ltd. Network service industry Singapore 100.0% 100.0% December Epsilon Telecommunications (SP) PTE. Ltd. Fixed line telecommunication business Singapore 100.0% 100.0% December Epsilon Telecommunications (US) PTE. Ltd. Fixed line telecommunication business Singapore 100.0% 100.0% December Epsilon Telecommunications Limited Fixed line telecommunication business UK 100.0% 100.0% December Epsilon Telecommunications (HK) Limited Fixed line telecommunication business Hong Kong 100.0% 100.0% December Epsilon US Inc. Fixed line telecommunication business USA 100.0% 100.0% December Epsilon Telecommunications (BG) EOOD Employee support service Bulgaria 100.0% 100.0% December Nasmedia-KT Alpha Future Growth Strategic Investment Fund Investment fund Korea 100.0% 100.0% December KT Strategic Investment Fund 6 Investment fund Korea 100.0% 100.0% December Altimedia Corporation Software development and delivery Korea 100.0% 100.0% December Altimidia B.V. (formerly Alticast B.V.) Software development and delivery Netherlands 100.0% 100.0% December Controlling percentage 1 Subsidiary Type of business Location December 31, December 31, Closing Altimidia Vietnam (formerly Alticast Company Limited) Software development and delivery Vietnam 100.0% 100.0 December BCCARD VIETNAM LTD. Software sales business Vietnam 100.0% 100.0% December KTP SERVICES INC. Fixed line telecommunication business Philippines 100.0% 100.0% December KT RUS LLC Foreign investment business Russia 100.0% 100.0% December Hangang Real Estate Investment Trust No. 24 Investment fund Korea 75.0% 75.0% December KT DX Vietnam Company Limited Software development Vietnam 100.0% 100.0% December KT Cloud Co., Ltd. Information and communications development Korea 100.0% 92.7% December Pocheon Jeonggyori Development Co., Ltd. Residential building development Korea 80.9% 80.9% December PT CRANIUM ROYAL ADITAMA Software development Indonesia 67.0% 67.0% December Juice Inc. 3,5 Online information provider/Software development and delivery Korea 41.2% 42.6% December open cloud lab Co., Ltd (formerly SPARK AND ASSOCIATES INC.) IT consulting service and Telecommunication equipment sales Korea 100.0% 100.0% December KD Living, Inc. Residential building management Korea —  100.0% December KT HEALTHCARE VINA COMPANY LIMITED Medical service Vietnam —  100.0% December K-Realty Qualified Private Real Estate Investment Trust No. 1 4 Real estate management Korea —  6.5% December AQUA RETAIL VIETNAM COMPANY LIMITED E-voucher issuance and trading business Vietnam —  100.0% December K-Realty Qualified Private Real Estate Investment Trust No. 4 Real estate management Korea —  93.9% December 1 Sum of the interests owned by the Controlling Company and subsidiaries. 2 Although the Controlling Company owns less than 50% interest in Nasmedia, Co., Ltd., KTCS Corporation and KTIS Corporation, Millie Seojae, and GENIE Music Corporation these entities are consolidated as the Controlling Company can exercise the majority of the voting rights in its decision-making process at all times considering voting patterns at previous shareholders’ meetings. 3 Although the Controlling Company owns less than 50 4 Although the Controlling Company owns less than 50% interest in K-Realty Qualified Private Real Estate Investment Trust No. 1, these entities are consolidated by comprehensively considering the criteria for determining control, such as ‘power’, ‘variable profit’, and ‘relationship between power and variable profit’, rather than simply judging by the interests owned by the company. 5 The number of treasury stocks held by subsidiaries are deducted from the total number of shares when calculating the controlling percentage interest. (2) Changes in Scope of Consolidation Subsidiaries newly included and excluded in the consolidation during the year ended December 31, 2023: Changes Location Name of subsidiary Reason Included Korea KD Living, Inc. Transferred 1 Included Vietnam KT HEALTHCARE VINA COMPANY LIMITED Newly established Included Korea K-Realty Qualified Private Real Estate Investment Trust No. 1 Transferred 2 Included Vietnam AQUA RETAIL VIETNAM COMPANY LIMITED Newly established Included Korea K-Realty Qualified Private Real Estate Investment Trust No. 4 Newly established Excluded United Arab Emirates Epsilon M E A General Trading LLC Liquidated Excluded Korea Alpha DX Solution Co., Ltd. Merged Excluded Korea KT Strategic Investment Fund No.2 Liquidated Excluded Korea LS Marine Solution Co., Ltd. (formerly KT Submarine Co., Ltd.) Excluded 3 Excluded Korea KT-Michigan Global Contents Fund Liquidated Excluded Russia KT Primorye IDC LLC Liquidated 1 The entity has been reclassified from a joint venture to a consolidated entity. 2 Although the Controlling Company owns less than 50% interest in K-Realty Qualified Private Real Estate Investment Trust No. 1, these entities are consolidated by comprehensively considering the criteria for determining control, such as ‘power’, ‘variable profit’, and ‘relationship between power and variable profit’, rather than simply judging by the interests owned by the company. 3 Due to the loss of control by the parent company, the entity has been reclassified from a subsidiary to an associate company. (3) Summarized information for consolidated subsidiaries as at and for the years ended December 31, 2021, 2022 and 2023 is as follows (In millions of Korean won) December 31, 2021 3 Total assets Total liabilities Operating 3 Profit (loss) for the year 3 KT Linkus Co., Ltd ￦ 54,219 ￦ 53,316 ￦ 81,434 ￦ (3,095 ) KT Submarine Co., Ltd. 110,390 10,736 31,374 (3,183 ) KT Telecop Co., Ltd. 363,224 233,797 515,456 3,985 KT Alpha Co., Ltd. (KT Hitel Co., Ltd.) 390,671 172,767 471,870 (8,692 ) KT Service Bukbu Inc. 59,341 54,070 231,602 1,128 KT Service Nambu Inc. 62,513 52,695 271,174 1,430 BC Card Co., Ltd. 1 3,933,427 2,481,004 3,580,970 120,308 H&C Network Co., Ltd. 1 88,616 4,993 227,604 11,995 Nasmedia Co., Ltd. 1 490,394 268,618 125,876 27,120 KTDS Co., Ltd. 1 341,358 199,831 632,899 21,464 KT M&S Co., Ltd. 241,377 203,051 710,634 3,496 KT MOS Bukbu Co., Ltd. 32,511 25,402 70,212 1,637 KT MOS Nambu Co., Ltd. 36,741 26,053 71,940 2,016 KT Skylife Co., Ltd. 1 1,275,645 469,694 772,950 62,309 KT Estate Inc. 1 2,370,940 791,884 577,578 213,203 KTGDH Co., Ltd. 11,464 1,560 4,423 553 KT Sat Inc. 593,616 34,169 174,750 20,830 KT Sports Inc. 29,524 19,740 67,612 (2,039 ) KT Music Contents Fund No.2 14,985 278 253 (30 ) KT-Michigan Global Contents Fund 3,552 112 13,592 10,032 KT M Mobile Inc. 144,175 40,749 204,641 5,918 KT Investment Co., Ltd. 1 87,366 66,108 21,040 (697 ) KTCS Corporation 1 416,750 234,172 968,499 19,034 KTIS Corporation 369,361 177,619 487,801 24,944 Next Connect PFV Inc. 518,441 167,963 —  (6,519 ) KT Japan Co., Ltd. 1 1,474 2,633 1,298 (142 ) KT America, Inc. 4,884 101 6,508 201 KT Rwanda Networks Ltd. 2 125,860 236,389 23,328 (28,770 ) AOS Ltd. 2 11,539 2,812 6,942 823 KT Hong Kong Telecommunications Co., Ltd. 6,613 1,346 18,825 1,313 KT Hopemate 1 6,311 2,978 12,538 116 KT Engineering Co., Ltd. (KT ENGCORE Co., Ltd.) 185,850 144,832 284,998 366 KT Studio Genie Co., Ltd. 1, 648,534 276,933 90,047 (16,443 ) Lolab Co., Ltd. 26,726 897 2,107 (134 ) East Telecom LLC 1 35,904 22,088 11,960 2,487 KT ES Pte. Ltd. 1 240,331 80,597 15,157 (6,355 ) KT Philippines 3,641 1,243 —  —  Altimedia Corporation 1 32,338 9,742 6,968 1,037 1 These companies are the intermediate controlling companies of other subsidiaries and the above financial information is from their consolidated financial statements. 2 Convertible preferred stock issued by subsidiaries as of the end of the reporting period is included in liabilities. 3 Profit or loss is included from the date of acquisition of control to the end of the reporting period. (in millions of Korean won) December 31, 2022 3 Total assets Total liabilities Operating 3 Profit (loss) for the year 3 KT Linkus Co., Ltd. ￦ 47,734 ￦ 47,498 ￦ 76,135 ￦ (614 ) KT Submarine Co., Ltd. 120,255 7,884 42,848 (12,126 ) KT Telecop Co., Ltd. 370,004 230,965 517,406 4,267 KT Alpha Co., Ltd 1 (KT Hitel Co., Ltd.) 406,236 172,211 516,737 13,115 KT Service Bukbu Co., Ltd. 74,673 65,820 252,304 3,227 KT Service Nambu Co., Ltd. 80,450 66,479 301,720 3,067 BC Card Co., Ltd. 1 5,666,075 4,109,200 3,897,090 148,341 H&C Network 82,737 6,640 27,392 992 Nasmedia Co., Ltd. 1 516,945 275,730 153,210 27,691 KTDS Co., Ltd. 1 401,932 228,474 723,161 30,941 KT M&S Co., Ltd. 255,310 204,336 730,802 8,105 KT MOS Bukbu Co., Ltd. 38,684 22,553 83,085 4,607 KT MOS Nambu Co., Ltd. 42,011 25,416 83,330 5,035 KT Skylife Co., Ltd. 1 1,359,166 503,679 1,038,468 20,941 KT Estate Inc. 1 2,480,333 833,842 478,188 58,780 KT GDH Co., Ltd. 12,059 1,596 4,323 451 KT Sat Co., Ltd. 677,980 89,644 185,313 28,073 KT Sports Co., Ltd. 28,220 15,461 65,350 (7,302 ) KT Music Contents Fund No.2 15,718 277 1,040 735 KT-Michigan Global Content Fund 2,371 27 33 (1,095 ) KT M Mobile Co., Ltd. 152,114 49,816 262,918 4,731 KT Investment Co., Ltd. 1 103,354 79,182 15,136 2,840 KTCS Corporation 1 419,726 228,618 1,031,010 17,634 KTIS Corporation 396,208 199,204 536,229 15,917 Next Connect PFV 624,734 277,967 3 (3,712 ) KT Japan Co., Ltd. 1 1,888 3,141 3,263 226 KT America, Inc. 5,945 843 8,070 37 KT Rwanda Networks Ltd. 2 126,721 267,369 30,834 (27,467 ) AOS Ltd. 2 10,972 905 8,049 1,274 KT Hong Kong Telecommunications Co., Ltd. 10,505 4,768 20,413 51 KT Huimangjieum 1 6,984 2,582 22,860 494 KT Engineering Co., Ltd. (KT ENGCORE Co., Ltd.) 141,463 89,853 258,435 10,302 KT Studio Genie Co., Ltd. 1 987,270 268,911 723,580 189,498 Lolab Co., Ltd. 35,091 17,247 74,881 (7,985 ) East Telecom LLC 1 42,691 21,645 27,030 6,419 KT ES Pte. Ltd. 1 240,721 88,640 78,815 (23,957 ) KTP SERVICES INC. 3,832 2,044 776 (255 ) Altimedia Corporation 1 44,861 15,777 47,203 6,035 KT RUS LLC 1 967 16 5 (871 ) KT DX Vietnam Company Limited 1,815 6 —  26 kt cloud Co., Ltd. 1 1,348,684 245,872 432,118 14,712 1 These companies are the intermediate controlling companies of other subsidiaries and the above financial information is from their consolidated financial statements. 2 Convertible preferred stock issued by subsidiaries as of the end of the reporting period is included in liabilities. 3 Profit or loss is included from the date of acquisition of control to the end of the reporting period. (in millions of Korean won) December 31, 2023 3 Total assets Total liabilities Operating Profit (loss) for the year KT Linkus Co., Ltd. ￦ 64,178 ￦ 63,452 ￦ 81,645 ￦ 821 KT Telecop Co., Ltd. 375,596        235,947 527,015 5,728 KT Alpha Co., Ltd. 443,639 191,254 437,308   19,352 KT Service Bukbu Co., Ltd. 63,760 55,360 242,119 1,212 KT Service Nambu Co., Ltd. 71,576 58,745 291,170 1,354 BC Card Co., Ltd. 1    6,352,878 4,722,432 4,027,450 76,545 H&C Network 81,107 4,863 27,205 1,814 Nasmedia Co., Ltd. 1 513,311 262,336 147,934 17,703 KTDS Co., Ltd. 1 393,667 202,067     727,477 33,971 KT M&S Co., Ltd. 258,477 209,075 695,856 3,783 KT MOS Bukbu Co., Ltd. 50,750 28,431 101,428 8,457 KT MOS Nambu Co., Ltd. 46,839 26,012 101,422 5,749 KT Skylife Co., Ltd. 1 1,220,842 479,369 1,034,342 (109,407 ) KT Estate Inc. 1 2,746,546 1,121,970 511,018 871 KT GDH Co., Ltd. 7,760 1,501 4,346 648 KT Sat Co., Ltd. 699,607 88,524 182,274    30,502 KT Sports Co., Ltd. 26,615 11,299 66,309 (12,386 ) KT Music Contents Fund No.2 5,558 1,772 534 (992 ) KT M Mobile Co., Ltd. 176,838 69,317 301,049 5,605 KT Investment Co., Ltd. 1 83,638 57,420 24,976 2,180 KTCS Corporation 1 434,900 234,850 1,035,911 15,804 KTIS Corporation 447,609 243,519 593,162 13,922 Next Connect PFV 946,687 629,809 —  (29,889 ) KT Japan Co., Ltd. 1 2,015 3,341 2,793 (110 ) KT America, Inc. 6,013 701 8,928 133 KT Rwanda Networks Ltd. 2 134,847 313,787 26,788 (57,628 ) AOS Ltd. 2 10,763 1,983 8,287 128 KT Hong Kong Telecommunications Co., Ltd. 11,142 5,121 19,373 143 KT Huimangjieum 1 8,073 2,715 17,687 1,012 KT Engineering Co., Ltd. 160,243    104,005   262,063 5,327 KT Studio Genie Co., Ltd. 1 989,187      259,413      542,955   13,507 Lolab Co., Ltd. 42,744 37,838 173,035 (12,938 ) East Telecom LLC 1 48,483 22,632 30,350 7,723 KT ES Pte. Ltd. 1 117,009 90,392 87,865 (124,850 ) KTP SERVICES INC. 2,967 919 671 235 Altimedia Corporation 1 48,381 12,374 45,035 7,352 KT RUS LLC 501 10 1 (378 ) KT DX Vietnam Company Limited 1,694 102 82 (207 ) KT Cloud Co., Ltd. 1    1,983,972    503,241   679,825    63,956 KT Healthcare Vina Co., Ltd. 12,730 439 —  (721 ) K-Realty Qualified Private Real Estate Investment Trust No. 1 80,266 50,693 4,682 (1,037 ) AQUA RETAIL VIETNAM COMPANY LIMITED 1,202 62 16 (248 ) 1 These companies are the intermediate controlling companies of other subsidiaries and the above financial information is from their consolidated financial statements. 2 Convertible preferred stock issued by subsidiaries as of the end of the reporting period is included in liabilities. 3 Profit or loss is included from the date of acquisition of control to the end of the reporting period.

Material Accounting Policies

Material Accounting Policies	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
Material Accounting Policies	2 Material Accounting Policies The principal accounting policies applied in the preparation of these consolidated financial statements are set out below. These 2.1 Basis of Preparation The consolidated financial statements of the Group have been prepared in accordance with International Financial Reporting Standards (“IFRS”) as issued by the International Accounting Standards Board (“IASB”). The financial statements have been prepared on a historical cost basis, except for the following: • Certain financial assets and liabilities (including derivative instruments) • Defined benefit pension plans – plan assets measured at fair value The preparation of the consolidated financial statements requires the use of critical accounting estimates. Management also needs to exercise judgement in applying the Group’s accounting policies. The areas involving a higher degree of judgment or complexity, or areas where assumptions and estimates are significant to the consolidated financial statements are disclosed in Note 3. 2.2 Changes in Accounting Policy and Disclosures (a) New and amended standards and interpretations adopted by the Group The Group has applied the following standards and interpretations for the first time for their annual reporting period commencing January 1, 2023. - IFRS 17 ‘Insurance Contract’ (Amendment) IFRS 17, which replaces IFRS 4 “Insurance Contracts,” establishes principles for recognition, measurement, and disclosure of insurance contracts, and is mainly characterized by measuring the current cost of insurance liabilities, recognizing insurance returns based on accrual accounting assumption, and marking the distinction between insurance gains and losses on investment. The Group does not have any contracts that meet the definition of an insurance contract under IFRS 17. - IAS 1 Presentation of Financial Statements IFRS Practice Statement 2 Making Materiality Judgements The amendments change the requirements in IAS 1 with regard to disclosure of accounting policies. The amendments replace all instances of the term ‘significant accounting policies’ with ‘material accounting policy information’. Accounting policy information is material if, when considered together with other information included in an entity’s financial statements, it can reasonably be expected to influence decisions that the primary users of general purpose financial statements make on the basis of those financial statements. The supporting paragraphs in IAS 1 are also amended to clarify that accounting policy information that relates to immaterial transactions, other events or conditions is immaterial and need not be disclosed. Accounting policy information may be material because of the nature of the related transactions, other events or conditions, even if the amounts are immaterial. However, not all accounting policy information relating to material transactions, other events or conditions is itself material. The IASB has also developed guidance and examples to explain and demonstrate the application of the ‘four-step materiality process’ described in IFRS Practice Statement 2. - IAS 1 Presentation of Financial Statements The amendments require disclosure of valuation gains or losses (limited to those recognized in the profit or loss) of the conversion options or warrants (or financial liabilities including them), if all or part of the financial instrument with exercise price that is adjusted depending on the issuer’s share price change is classified as financial liability as defined in paragraph of IAS 32 – Financial Instrument: Presentation. - IAS 8 Accounting Polices, Changes in Accounting Estimates and Errors The amendments replace the definition of a change in accounting estimates with a definition of accounting estimates. Under the new definition, accounting estimates are “monetary amounts in financial statements that are subject to measurement uncertainty”. The definition of a change in accounting estimates was deleted. - IAS 12 Income Taxes The amendments introduce a further exception from the initial recognition exemption. Under the amendments, an entity does not apply the initial recognition exemption for transactions that give rise to equal taxable and deductible temporary differences. Depending on the applicable tax law, equal taxable and deductible temporary differences may arise on initial recognition of an asset and liability in a transaction that is not a business combination and affects neither accounting nor taxable profit. For example, this may arise upon recognition of a lease liability and the corresponding right-of-use asset applying IFRS 16 at the commencement date of a lease. Following the amendments to IAS 12, an entity is required to recognise the related deferred tax asset and liability, with the recognition of any deferred tax asset being subject to the recoverability criteria in IAS 12. - IAS 12 Income Taxes The amendment clarifies that IAS 12 Income Taxes However, by introducing a temporary exception to the deferred tax accounting requirements of IAS 12 Income Taxes There is no significant impact of the amendments listed above on the consolidated financial statements. (b) New standards and interpretations not yet adopted by the Group The following new accounting standards and interpretations that have been published are not mandatory for December 31, 2023 reporting periods and have not been early adopted by the Group. - IAS 1 Presentation of Financial Statements The amendments clarify that the classification of liabilities as current and non-current is based on rights that are existing at the end of the reporting period, specify that classification is unaffected by expectations about whether an entity will exercise its right to defer settlement of a liability, explain that rights are in existence if covenants are complied with at the end of the reporting period, and introduce a definition of ‘settlement’ to make clear that settlement refers to the transfer to the counterparty of cash, equity instruments, other assets or services. - IAS 1 Presentation of Financial Statements The amendments regulate that only certain conditions in the borrowing arrangement (referred to as the “Agreement”) that must be observed before the end of the reporting period affect the right of the entity to defer repayment of the liability for at least 12 months after the reporting period. Even if compliance with the agreement is assessed only after the reporting period, these arrangements affect the existence of the right as of the end of the reporting period. It also regulates that arrangements that must be observed only after the reporting period do not affect the right to defer settlement. However, if the Group’s right to defer settlement of a liability depends on the agreement that complies with within 12 months of the reporting period, disclosing the information to help users of financial statements understand the risk that the liability could be repaid within 12 months of the reporting period. This information includes information about the agreements (including the nature of the agreements, when the Group is required to comply), the carrying amount of the relevant liabilities, and the facts and circumstances indicating that they may be difficult to satisfying with. The above amendments are applied retrospectively for annual reporting periods beginning on or after 1 January 2024, with early application permitted. - IAS 7 ‘Cash Flow Statement’ and ‘Financial Instruments Disclosure’- Supplier Financial Agreement(Amendment) The amendment adds the purpose of disclosure in IAS 7 ‘Cash Flow Statement’, users of financial statements should disclose information about supplier financial agreements so that they can assess the affect of them on the Group’s liabilities and cash flows. In addition, supplier financial agreements were added as an example of the requirement to amend IAS 7 to disclose information about exposure to liquidity risk concentration. The term ‘supplier financial agreements’ is not defined; instead, the amendment presents the nature of the arrangement that should be informed. For achieving the purpose of disclosure, the following information on supplier financial agreements must be disclosed in an integrated manner. • the terms and conditions of an agreement • The carrying amount of financial liabilities corresponding to the supplier’s financial agreement and the items displayed in the statement of financial position in relation to the financial liabilities • The carrying amount corresponding to the portion of the financial liabilities that the supplier has already received from the financial provider and the items displayed in the statement of financial position in relation to the financial liabilities • The scope of payment date for financial liabilities corresponding to supplier financial agreements and the scope of payment date for comparable purchase liabilities not corresponding to supplier financial agreements • Types of non-cash changes in the carrying amount of financial liabilities corresponding to supplier financial agreements and their impact • Liquidity risk information The above amendments are applied retrospectively for annual reporting periods beginning on or after 1 January 2024, with early application permitted. - IFRS 16 ‘Lease’ – Lease liabilities arising from leaseback (Amendment) The amendment adds a follow-up measurement requirement for leaseback that is accounted for as sales by applying IFRS 15 ‘revenue from contracts with customers’. The amendment requires the seller to calculate a ‘lease fee’ or an ‘modified lease fee’ in such a way that the seller-less user does not recognize any difference or gain for the right to use that the seller-less user continues to hold after the lease commencement date. The above amendments are applied retrospectively for annual reporting periods beginning on or after 1 January 2024, with early application permitted. - IAS 1 Presentation of Financial Statements (revised in 2023) – Disclosure of Virtual Assets The amendments, in addition to the disclosure requirements required by other Standards for transactions related to virtual assets, define the requirements for disclosure in each case: 1) holding virtual assets; 2) holding virtual assets on behalf of customers; and 3) issuing virtual assets. If a virtual asset is held, information on the general information of the virtual asset, the applied accounting policy, the acquisition path, acquisition cost, and fair value of each virtual asset should be disclosed. In addition, when a virtual asset is issued, the performance status related to the issued virtual asset, the moment and the exposure of revenue recognition of the sold virtual asset, the quantity of virtual assets held after issuance, and important contract details should be disclosed. The above amendments are applied retrospectively for annual reporting periods beginning on or after 1 January 2024, with early application permitted. - IFRS 18 Presentation and Disclosure in financial statements (Amendment) The purpose of the amendment is to set out requirements for the presentation and disclosure of information in general purpose financial statements (financial statements) to help ensure they provide relevant information that faithfully represents an entity’s assets, liabilities, equity, income and expenses. IFRS 18 applies to all financial statements that are prepared and presented in accordance with International Financial Reporting Standards and replaces IAS 1 Presentation of Financial Statements. The key changes included in the amendments include (1) an introduction of a defined structure for the statement of profit or loss including categories for classifying incomes and expenses, subtotals for operating profit and profit before financing and income taxes, (2) an introduction of specific disclosure requirements related to the statement of profit or loss which include but are not limited to management-defined performance measures, (3) enhanced guidance on the principles of aggregation and disaggregation which focus on grouping items based on their shared characteristics and (4) some other limited changes to presentation and disclosures in the financial statements. The above amendments are applied retrospectively for annual reporting periods beginning on or after 1 January 2027, with early application permitted. The Group is reviewing the impact of the above-listed amendments on the consolidated financial statements. 2.3 Consolidation The Group has prepared the consolidated financial statements in accordance with IFRS 10 Consolidated Financial Statements (a) Subsidiaries Subsidiaries are all entities (including special purpose entities (“SPEs”)) over which the Group has control. The Group controls an entity when the Group is exposed to, or has rights to, variable returns from its involvement with the entity and has the ability to affect those returns through its power to direct the activities of the entity. Subsidiaries are fully consolidated from the date on which control is transferred to the Group. They are deconsolidated from the date that control ceases. The acquisition method of accounting is used to account for business combinations by the Group. The consideration transferred is measured at the fair values of the assets transferred, and identifiable assets acquired, and liabilities and contingent liabilities assumed in a business combination are measured initially at their fair values at the acquisition date. The Group recognizes any non-controlling interest in the acquired entity on an acquisition-by-acquisition basis either at fair value or at the non-controlling interest’s proportionate share of the acquired entity’s net identifiable assets. All other non-controlling interests are measured at fair values, unless otherwise required by other standards. Acquisition-related costs are expensed as incurred. The excess of consideration transferred, amount of any non-controlling interest in the acquired entity and acquisition-date fair value of any previous equity interest in the acquired entity over the fair value of the net identifiable assets acquired is recoded as goodwill. If those amounts are less than the fair value of the net identifiable assets of the business acquired, the difference is recognized directly in the profit or loss as a bargain purchase. Intercompany transactions, balances and unrealized gains on transactions among group companies are eliminated. Unrealized losses are also eliminated unless the transaction provides evidence of an impairment of the transferred asset. Accounting policies of subsidiaries have been changed where necessary to ensure consistency with the policies adopted by the Group. (b) Changes in ownership interests in subsidiaries without loss of control Any differences between the amount of the adjustment to non-controlling interest that do not result in loss of control and any consideration paid or received is recognized in a separate reserve within equity attributable to owners of the Controlling Company. (c) Disposal of subsidiaries When the Group ceases to have control over a subsidiary, any retained interest in the subsidiary is remeasured to its fair value with the change in carrying amount recognized in profit or loss. (d) Associates Associates are entities over which the Group has significant influence but does not possess control or joint control. Investments in associates are accounted for using the equity method of accounting, after initially being recognized at cost. Unrealized gains on transactions between the Group and its associates are eliminated to the extent of the Group’s interest in the associates. If the Group’s share of losses of an associate equals or exceeds its interest in the associate (including long-term interests that, in substance, form part of the Group’s net investment in the associate), the Group discontinues recognizing its share of further losses. After the Group’s interest is reduced to zero, additional losses are provided for, and a liability is recognized, only to the extent that the Group has incurred legal or constructive obligations or made payments on behalf of the associate. If there is an objective evidence of impairment for the investment in the associate, the Group recognizes the difference between the recoverable amount of the associate and its book amount as impairment loss. If an associate uses accounting policies other than those of the Group for transactions and events in similar circumstances, if necessary, adjustments shall be made to make the associate’s accounting policies conform to those of the Group when the associate’s financial statements are used by the Group in applying the equity method. (e) Joint arrangements A joint arrangement, wherein two or more parties have joint control, is classified as either a joint operation or a joint venture. A joint operator recognizes its direct right to the assets, liabilities, revenues, and expenses of joint operations and its share of any jointly held or incurred assets, liabilities, revenues, and expenses. A joint venture has rights to the net assets relating to the joint venture and accounts for that investment using the equity method. 2.4 Segment Reporting Information of each operating segment is reported in a manner consistent with the business segment reporting provided to the chief operating decision-maker (Note 34). The chief operating decision-maker is responsible for allocating resources and assessing performance of the operating segments. 2.5 Foreign Currency Translation (a) Functional and presentation currency Items included in the financial statements of each of the Group’s entities are measured using the currency of the primary economic environment in which each entity operates (the “functional currency”). The consolidated financial statements are presented in Korean won, which is the Controlling Company’s functional and presentation currency. (b) Transactions and balances Foreign currency transactions are translated into the functional currency using the exchange rates at the dates of the transactions. Foreign exchange gains and losses resulting from the settlement of such transactions and from the translation of monetary assets and liabilities denominated in foreign currencies at year end exchange rates are generally recognized in profit or loss. They are deferred in other comprehensive income if they relate to qualifying cash flow hedges and qualifying effective portion of net investment hedges, or are attributable to monetary part of the net investment in a foreign operation. Foreign exchange gains and losses that relate to financial instruments are presented in the statement of profit or loss, within finance costs. All other foreign exchange gains and losses are presented in the statement of profit or loss within ‘other income’ or ‘other expense’. Non-monetary items that are measured at fair value in a foreign currency are translated using the exchange rates at the date when the fair value was determined. Translation differences on assets and liabilities carried at fair value are reported as part of the fair value gain or loss. For example, translation differences on non-monetary assets and liabilities, such as equities held at fair value through profit or loss, are recognized in profit or loss as part of the fair value gain or loss and translation differences on non-monetary assets, such as equities classified as available-for-sale financial assets, are recognized in other comprehensive income . 2.6 Financial Assets (a) Classification The Group classifies its financial assets in the following measurement categories: • those to be measured at fair value through profit or loss • those to be measured at fair value through other comprehensive income • those to be measured at amortized cost The classification depends on the Group’s business model for managing the financial assets and the contractual terms of the cash flows. For financial assets measured at fair value, gains and losses will either be recorded in profit or loss or other comprehensive income. For investments in debt instruments, this will depend on the business model in which the investment is held. The Group reclassifies debt investments when, and only when, its business model for managing those assets changes. For investments in equity instruments that are not held for trading, this will depend on whether the Group has made an irrevocable election at the time of initial recognition to account for the equity investment at fair value through other comprehensive income. Changes in fair value of the investments in equity instruments that are not accounted for as other comprehensive income are recognized in profit or loss. (b) Measurement At initial recognition, the Group measures a financial asset at its fair value plus, in the case of a financial asset not at fair value through profit or loss, transaction costs that are directly attributable to the acquisition of the financial asset. Transaction costs of financial assets carried at fair value through profit or loss are expensed in profit or loss. Financial assets with embedded derivatives are considered in their entirety when determining whether their cash flows are solely payment of principal and interest. A. Debt instruments Subsequent measurement of debt instruments depends on the Group’s business model for managing the asset and the cash flow characteristics of the asset. The Group classifies its debt instruments into one of the following three measurement categories: • Amortized cost: Assets that are held for collection of contractual cash flows where those cash flows represent solely payments of principal and interest are measured at amortized cost. A gain or loss on a debt investment that is subsequently measured at amortized cost and is not part of a hedging relationship is recognized in profit or loss when the asset is derecognized or impaired. Interest income from these financial assets is included in ‘finance income’ using the effective interest rate method. • Fair value through other comprehensive income: Assets that are held for collection of contractual cash flows and for selling the financial assets, where the assets’ cash flows represent solely payments of principal and interest, are measured at fair value through other comprehensive income. Movements in the carrying amount are taken through other comprehensive income, except for the recognition of impairment loss (and reversal of impairment loss), interest income and foreign exchange gains and losses which are recognized in profit or loss. When the financial asset is derecognized, the cumulative gain or loss previously recognized in other comprehensive income is reclassified from equity to profit or loss. Interest income from these financial assets is included in ‘finance income’ using the effective interest rate method. Foreign exchange gains and losses are presented in ‘finance income’ or ‘finance costs’ and impairment loss in ‘finance costs’ or ‘operating expenses’. • Fair value through profit or loss: Assets that do not meet the criteria for amortized cost or fair value through other comprehensive income are measured at fair value through profit or loss. A gain or loss on a debt investment that is subsequently measured at fair value through profit or loss and is not part of a hedging relationship is recognized in profit or loss and presented net in the statement of profit or loss within ‘finance income’ or ‘finance costs’ in the period in which it arises. B. Equity instruments The Group subsequently measures all equity investments at fair value. Where the Group’s management has elected to present fair value gains and losses on equity investments in other comprehensive income, there is no subsequent reclassification of fair value gains and losses to profit or loss following the derecognition of the investment. Dividend income from such investments continue to be recognized in profit or loss as ‘finance income’ when the Group’s right to receive payments is established. Changes in the fair value of financial assets at fair value through profit or loss are recognized in ‘finance income’ or ‘finance costs’ in the statement of profit or loss as applicable. Impairment loss (reversal of impairment loss) on equity investments, measured at fair value through other comprehensive income, are not reported separately from other changes in fair value. (c) Impairment The Group assesses on a forward-looking basis the expected credit losses associated with its debt instruments carried at amortized cost and fair value through other comprehensive income. The impairment methodology applied depends on whether there has been a significant increase in credit risk. For trade receivables and lease receivables, the Group applies the simplified approach, which requires expected lifetime credit losses to be recognized from initial recognition of the receivables. (d) Recognition and derecognition Regular way purchases and sales of financial assets are recognized or derecognized on trade-date, the date on which the Group commits to purchase or sell the asset. Financial assets are derecognized when the rights to receive cash flows from the financial assets have expired or have been transferred and the Group has transferred substantially all the risks and rewards of ownership. If a transfer does not result in derecognition because the Group has retained substantially all the risks and rewards of ownership of the transferred asset, the Group continues to recognize the transferred asset in its entirety and recognizes a financial liability for the consideration received. (e) Offsetting of financial instruments Financial assets and liabilities are offset and the net amount reported in the statements of financial position where there is a legally enforceable right to offset the recognized amounts and there is an intention to settle on a net basis or realize the assets and settle the liability simultaneously. The legally enforceable right must not be contingent on future events and must be enforceable in the normal course of business and in the event of default, insolvency or bankruptcy of the Group or the counterparty. 2.7 Derivative Instruments Derivatives are initially recognized at fair value on the date a derivative contract is entered into and are subsequently remeasured to their fair value at the end of each reporting period. The accounting treatment for subsequent changes in fair value depends on whether the derivative is designated as a hedging instrument, and if so, the nature of the item being hedged. The Group has hedge relationships and designates certain derivatives as: • hedges of a particular risk associated with the cash flows of recognized assets and liabilities and highly probable forecast transactions (cash flow hedges) At inception of the hedge relationship, the Group documents the economic relationship between hedging instruments and hedged items including whether changes in the cash flows of the hedging instruments are expected to offset changes in the cash flows of hedged items. The fair values of derivative financial instruments designated in hedge relationships are disclosed in Note 37. The full fair value of a hedging derivative is classified as a non-current asset or liability when the remaining maturity of the hedged item is more than 12 months; it is classified as a current asset or liability when the remaining maturity of the hedged item is less than 12 months. A non-derivative financial asset and a non-derivative financial liability is classified as a current or non-current based on its expected maturity and its settlement, respectively. The effective portion of changes in fair value of derivatives that are designated and qualify as cash flow hedges is recognized in the cash flow hedge reserve within equity to the limit of the cumulative change in fair value (present value) of the hedge item (the present value of the cumulative change in the future expected cash flows of the hedged item) from the inception of the hedge. The ineffective portion is recognized in ‘finance income (costs)’. Amounts of changes in fair value of effective hedging instruments accumulated in equity are recognized as ‘finance income (costs)’ for the periods when the corresponding transactions affect profit or loss. When a hedging instrument expires, or is sold, terminated, exercised, or when a hedge no longer meets the criteria for hedge accounting, any accumulated cash flow hedge reserve at that time remains in equity until the forecast transaction occurs, resulting in the recognition of a non-financial asset such as inventory. When the forecast transaction is no longer expected to occur, the cash flow hedge reserve and deferred costs of hedging that were reported in equity are immediately reclassified to profit or loss. 2.8 Trade Receivables Trade receivables are recognized initially at the amount of consideration that is unconditional, unless they contain significant financing components when they are recognized at fair value. Trade receivables are subsequently measured at amortized cost using the effective interest method, less loss allowance. See Note 6 for further information about the Group’s accounting treatment for trade receivables and Note 2.6 (c) for a description of the Group’s accounting policy on impairment. 2.9 Inventories Inventories are stated at the lower of cost and net realizable value. Cost is determined using the moving average method, except for inventories in-transit (specific identification method). 2.10 Property and Equipment Property and equipment are stated at historical cost less accumulated depreciation and accumulated impairment losses. Historical cost includes expenditures that is directly attributable to the acquisition of the items. Depreciation of all property and equipment, except for land, is calculated using the straight-line method to allocate their cost, net of their residual values, over their estimated useful lives as follows: Useful Life Buildings 5 – 40 years Structures 5 – 40 years Machinery and equipment (Telecommunications equipment and others) 2 – 40 years Vehicles 4 – 10 years Tools 2 – 6 years Office equipment 2 – 8 years The depreciation method, residual values, and useful lives of property and equipment are reviewed at the end of each reporting period and, if appropriate, accounted for as changes in accounting estimates. 2.11 Investment Property Real estate 2.12 Intangible Assets (a) Goodwill Goodwill is measured as explained in Note 2.3 (a) and goodwill arising from acquisition of subsidiaries and businesses is included in intangible assets. Goodwill is tested annually for impairment and carried at cost less accumulated impairment losses. Gains and losses on the disposal of subsidiaries and business include the carrying amount of goodwill relating to the subsidiaries and businesses sold. For the purpose of impairment testing, goodwill acquired in a business combination is allocated to each of the CGUs, or group of CGUs, that is expected to benefit from the synergies of the combination. Goodwill is monitored at the operating segment level. (b) Intangible assets excluding goodwill Intangible assets, except for goodwill, are initially recognized at its historical cost, and carried at cost less accumulated amortization and accumulated impairment losses. Membership rights (condominium membership and golf membership), subscription rights, broadcast license, facility-use rights, and transportation rights that have indefinite useful life are not subject to amortization because there is no foreseeable limit to the period over which the assets are expected to be utilized . The Group amortizes intangible assets with a limited useful life using the straight-line method over the following periods: Useful Life Development costs 3 – 10 years  Software 3 – 10 years  Frequency usage rights 5 – 10 years  Others 1 1 – 50 years  1 Membership rights (condominium membership and golf membership), subscription rights, broadcast license, facility usage rights and transportation license included in others are classified as intangible assets with indefinite useful life. 2.1 3 Borrowing Costs General and specific borrowing costs that are directly attributable to the acquisition, construction or production of a qualifying asset are capitalized during the period of time that is required to complete and prepare the asset for its intended use or sale. Investment income earned on the temporary investment of specific borrowings on qualifying assets is deducted from the borrowing costs eligible for capitalization. Other borrowing costs are expensed in

Critical Accounting Estimates a

Critical Accounting Estimates and Assumptions	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
Critical Accounting Estimates and Assumptions	3 Critical Accounting Estimates and Assumptions The preparation of financial statements requires the Group to make estimates and assumptions concerning the future. Management also needs to exercise judgement in applying the Group’s accounting policies. Estimates and assumptions are continually evaluated and are based on historical experience and other factors, including expectations of future events that are believed to be reasonable under the circumstances. As the resulting accounting estimates will, by definition, seldom equal the actual results, it poses significant risk of resulting in a material adjustment. Estimates and assumptions that have significant risks of causing a material adjustment to the carrying amounts of assets and liabilities within the next financial year are discussed below. Additional information of significant judgement and assumptions of certain items are included in relevant notes. 3.1 Impairment of Non-Financial Assets (including Goodwill) The Group determines the recoverable amount of a cash generating unit (CGU) based on fair value or value-in-use calculations to assess non-financial assets (including goodwill) for impairment (Note 12, 13). 3.2 Income Taxes The Group’s taxable income generated from these operations are subject to income taxes based on tax laws and interpretations of tax authorities in numerous jurisdictions. There are many transactions and calculations for which the ultimate tax determination is uncertain (Note 29). If certain portion of the taxable income is not used for investments or increase in wages or dividends in accordance with the Tax System for Recirculation of Corporate Income, 3.3 Fair Value of Financial Instruments The fair value of financial instruments that are not traded in an active market is determined by using valuation techniques. The Group uses its judgment to select a variety of methods and make assumptions that are mainly based on market conditions existing at the end of each reporting period (Note 37). 3.4 Net Defined Benefit Liability The present value of net defined benefit liability depends on a number of factors that are determined on an actuarial basis using a number of assumptions including the discount rate (Note 17). 3.5 Amortization of Contract Assets, Contract Liabilities and Contract Cost Assets Contract assets, contract liabilities and contract cost assets recognized under the application of IFRS 15 are amortized over the expected periods of customer relationships. The estimate of the expected terms of customer relationship is based on the historical data. If management’s estimate changes, it may cause significant differences in the timing of revenue recognition and amounts recognized. 3.6 Critical Judgments in Determining the Lease Term In determining the lease term, management considers all facts and circumstances that create an economic incentive to exercise an extension option, or not exercise a termination option. Extension options (or periods after termination options) are only included in the lease term if the lease is reasonably certain to be extended (or not terminated). For leases of property, machinery, and communication line facilities, the following factors are normally the most relevant: • If there are significant penalties to terminate (or not extend), the Group is typically reasonably certain to extend (or not terminate). • If any leasehold improvements are expected to have a significant remaining value, the Group is typically reasonably certain to extend (or not terminate). • Otherwise, the Group considers other factors including historical lease durations and the costs and business disruption required to replace the leased asset. Most extension options in offices, retail stores and vehicles leases have not been included in the lease liability, because the Group can replace the assets without significant cost or business disruption. The lease term is reassessed if an option is actually exercised (or not exercised) or the Group becomes obliged to exercise (or not exercise) it. The assessment of reasonable certainty is only revised if a significant event or a significant change in circumstances occurs, which affects this assessment, and that is within the control of the lessee.

Financial Instruments by Catego

Financial Instruments by Category	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
Financial Instruments by Category	4. Financial Instruments by Category (1) Financial instruments by category as o (in millions of Korean won) December 31, 2022 Financial assets Financial Financial Financial Derivatives used for Total Cash and cash equivalents ￦ 2,449,062 ￦ —  ￦ —  ￦ —  ￦ 2,449,062 Trade and other receivables 7,459,994 —  129,124 —  7,589,118 Other financial assets 1,060,058 1,064,856 1,508,192 190,830 3,823,936 (in millions of Korean won) December 31, 2022 Financial liabilities Financial cost Financial profit and Derivatives used for Others Total Trade and other payables 1 ￦ 8,397,264 ￦ —  ￦ —  ￦ —  ￦ 8,397,264 Borrowings 10,006,685 —  —  —  10,006,685 Other financial liabilities 246,606 141,280 33,555 —  421,441 Lease liabilities —  —  —  1,172,038 1,172,038 1 Amounts related to employee benefit plans are included in Trade and other payables. (in millions of Korean won) December 31, 2023 Financial assets Financial Financial Financial Derivatives used for Total Cash and cash equivalents ￦ 2,879,554 ￦ —  ￦ —  ￦ —  ￦ 2,879,554 Trade and other receivables 8,458,259 —  116,198 —  8,574,457 Other financial assets 1,385,921 939,661 1,680,168 159,211 4,164,961 (in millions of Korean won) December 31, 2023 Financial liabilities Financial cost Financial profit and Derivatives used for Others Total Trade and other payables ￦ 8,317,822 ￦ —  ￦ —  ￦ —  ￦ 8,317,822 Borrowings 10,218,165 —  —  —  10,218,165 Other financial liabilities 915,185 136,106 24,547 —  1,075,838 Lease liabilities —  —  —  1,179,909 1,179,909 (2) Gains or l o (in millions of Korean won) 2021 2022 2023 Financial assets at amortized cost Interest income 1 ￦ 74,937 ￦ 144,505 ￦ 360,134 Gain on foreign currency transactions 4 12,826 23,824 22,782 Gain (loss) on foreign currency translation 2,911 (2,151 ) 5,741 Gain (loss) on disposal 35 (81 ) (3,409 ) Loss on valuation (110,286 ) (132,102 ) (172,966 ) Financial assets at fair value through profit or loss Interest income 1 3,673 6,008 13,480 Dividend income 5 21,499 4,600 6,918 Gain (loss) on valuation 6 64,659 (29,282 ) (31,965 ) Gain on disposal 29,974 2,347 14,237 Gain on foreign currency transactions 4 —  1,100 —  Gain on foreign currency translation 17,794 13,711 3,396 Financial assets at fair value through other comprehensive income Interest income 1 222,290 190,281 18,966 Dividend income 5 1,365 9,522 52,813 Loss on valuation —  (61 ) —  Loss on disposal (22,712 ) (62,183 ) (11,193 ) Other comprehensive income (loss) for the year 2 129,780 (158,574 ) 121,805 Derivatives used for hedging Gain on transactions —  27,628 10,192 Gain on valuation 7 203,961 150,699 34,092 Other comprehensive income for the year 2 144,967 88,048 7,772 (in millions of Korean won) 2021 2022 2023 Reclassified to profit or loss from other comprehensive gain (loss) for the year 2,3 (143,305 ) (110,616 ) (29,178 ) Financial liabilities at amortized cost Interest expense 1 (232,197 ) (275,302 ) (358,486 ) Gain on valuation 8 —  —  3,411 Loss on foreign currency transactions 4 (3,580 ) (34,574 ) (24,054 ) Loss on foreign currency translation (201,623 ) (168,577 ) (93,004 ) Financial liabilities at fair value through profit or loss Gain (loss) on valuation 42,447 30,031 (7,394 ) Gain on disposal Interest expense 1 2,136 —  —  (4,046 ) 4,788 (44 ) Gain (loss) on foreign currency transactions 4 (2 ) 24 (5 ) Derivatives used for hedging Loss on transactions (6,208 ) (1,291 ) —  Gain (loss) on valuation (7,206 ) (17,237 ) 11,503 Other comprehensive income (loss) for the year 2 (3,112 ) (23,957 ) 7,557 Reclassified to profit or loss from other comprehensive income for the year 2,3 6,722 15,195 (8,764 ) Lease liabilities Interest expense 1 (36,650 ) (41,469 ) (52,035 ) Total ￦ 215,095 ￦ (353,980 ) ￦ (92,910 ) 1 BC Card Co., Ltd., etc., subsidiaries of the Group, recognized interest income and expenses as operating revenue and expenses, respectively. Related interest income recognized as operating revenue is ￦ ￦ ￦ ￦ ￦ ￦ 2 The amounts directly reflected in equity after adjustments of deferred income tax. 3 During the years ended December 31, 2022 and 2023, certain derivatives of the Group were settled and the related gain or loss on valuation of cash flow hedge in other comprehensive income was reclassified to profit or loss for the year. 4 BC Card Co., Ltd., a subsidiary of the Group, recognized foreign currency transaction gain and loss and as operating revenue and expense. In relation to this, foreign currency transaction gain and loss recognized as operating revenue and expense amount to foreign exchange gain ￦ ￦ ￦ 5 BC Card Co., Ltd., a subsidiary of the Group, recognized dividend income as operating revenue. Related dividend income recognized as operating revenue is ￦ ￦ ￦ 6 KT Investment Co., Ltd., etc., subsidiaries of the Group, recognized gain and loss on valuation of financial instruments measured at fair value through profit or loss as operating income and expenses. In relation to this, valuation gain and loss recognized as operating revenue and expense amount to valuation loss ￦ ￦ ￦ 7 BC Card Co., Ltd., a subsidiary of the Group, recognized gain and loss on valuation of derivatives as operating income and expenses. Related valuation gain recognized as operating revenue and expense is ￦ ￦ 8 KT Cloud Co., Ltd., a subsidiary of the Group, recognized gain on valuation as convertible preferred stock of ￦

Cash and Cash Equivalents

Cash and Cash Equivalents	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
Cash and Cash Equivalents	5 Cash and Cash Equivalents Restricted cash and cash equivalents as of December 31, 2022 and 2023, are as follows: (in millions of Korean won) December 31, December 31, Description Bank deposits ￦ ￦ Deposit restricted for government project and others

Trade and Other Receivables

Trade and Other Receivables	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
Trade and Other Receivables	6 Trade and Other Receivables (1) Trade and other receivables as of December 31, 2022 and 2023, are as follows: December 31, 2022 (in millions of Korean won) Total Provision Present value Carrying amount Current assets Trade receivables ￦ 3,439,542 ￦ (342,539 ) ￦ (6,926 ) ￦ 3,090,077 Other receivables 3,092,261 (82,243 ) (2,023 ) 3,007,995 Total ￦ 6,531,803 ￦ (424,782 ) ￦ (8,949 ) ￦ 6,098,072 Non-current assets Trade receivables ￦ 408,098 ￦ (1,199 ) ￦ (11,540 ) ￦ 395,359 Other receivables 1,249,096 (136,300 ) (17,109 ) 1,095,687 Total ￦ 1,657,194 ￦ (137,499 ) ￦ (28,649 ) ￦ 1,491,046 December 31, 2023 (in millions of Korean won) Total Provision Present value Carrying amount Current assets Trade receivables ￦ 3,596,899 ￦ (330,002 ) ￦ (9,165 ) ￦ 3,257,732 Other receivables 3,990,900 (76,089 ) (2,254 ) 3,912,557 Total ￦ 7,587,799 ￦ (406,091 ) ￦ (11,419 ) ￦ 7,170,289 Non-current assets Trade receivables ￦ 318,429 ￦ (1,288 ) ￦ (19,476 ) ￦ 297,665 Other receivables 1,227,929 (107,547 ) (13,879 ) 1,106,503 Total ￦ 1,546,358 ￦ (108,835 ) ￦ (33,355 ) ￦ 1,404,168 (2) The fair values of trade and other receivables with original maturities less than one year are equal to their carrying amounts because the discounting effect is immaterial. The fair value of trade and other receivables with original maturities longer than one year, which are mainly from sales of goods, is determined by discounting the expected future cash flow at the weighted average interest rate. (3) Details of changes in provision for impairment for the years ended December 31, 2022 and 2023, are as follows: 2022 2023 (in millions of Korean won) Trade Other Trade Other receivables Beginning balance ￦ 349,725 ￦ 201,387 ￦ 343,738 ￦ 218,543 Provision 64,522 65,941 69,972 114,501 Reversal —  (850 ) —  (14,941 ) Write-off/transfer (69,430 ) (49,904 ) (69,246 ) (129,108 ) Acquisition and disposition of businesses (43 ) —  (310 ) (17 ) Others (1,036 ) 1,969 (12,864 ) (5,342 ) Ending balance ￦ 343,738 ￦ 218,543 ￦ 331,290 ￦ 183,636 Provisions for impairment on trade and other receivables are recognized as operating expenses and finance costs. (4) Details of other receivables as of December 31, 2022 and 2023, are as follows: (in millions of Korean won) December 31, December 31, Loans ￦ 98,953 ￦ 51,854 Receivables 1 2,668,545 3,539,742 Accrued income 32,218 43,920 Refundable deposits 339,450 299,935 Loans receivable 1,013,428 1,067,005 Finance lease receivables 105,690 141,883 Others 63,941 58,357 Less: Provision for impairment (218,543 ) (183,636 ) ￦ 4,103,682 ￦ 5,019,060 1 As of December 31, 2023, credit sales asset of ￦ ￦ (5) The maximum exposure of trade and other receivables to credit risk is the carrying amount of each class of receivables mentioned above as of December 31, 2023. (6) For trade receivables that meet certain criteria, the Group sells those on a periodic basis to an Special Purpose Company(SPC) and records them at financial assets as fair value through other comprehensive income considering the trade receivables business model for managing the asset and the cash flow characteristics of the contract.

Other Financial Assets and Liab

Other Financial Assets and Liabilities	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
Other Financial Assets and Liabilities	7 Other Financial Assets and Liabilities (1) Details of other financial assets and liabilities as of December 31, 2022 and 2023, are as follows: (in millions of Korean won) December 31, 2022 December 31, 2023 Other financial assets Financial assets at amortized cost 1 ￦ 1,060,058 ￦ 1,385,921 Financial assets at fair value through profit or loss 1,2 1,064,856 939,661 Financial assets at fair value through other comprehensive income 1,508,192 1,680,168 Derivatives used for hedging 190,830 159,211 Less: Non-current (2,501,484 ) (2,724,761 ) Current ￦ 1,322,452 ￦ 1,440,200 Other financial liabilities Financial liabilities at amortized cost 3 ￦ 246,606 ￦ 915,185 Financial liabilities at fair value through profit or loss 141,280 136,106 Derivatives used for hedging 33,555 24,547 Less: Non-current (412,650 ) (753,739 ) Current ￦ 8,791 ￦ 322,099 1 As of December 31, 2023, the Group’s other financial assets amounting to ￦ ￦ 2 As of December 31, 2023, the Group provided investments in Korea Software Financial Cooperative amounting to ￦ 3 The amount includes liabilities related to the obligation to acquire additional shares in Epsilon Global Communications Pte. Ltd. and MILLIE Co., Ltd and KT Cloud Co., Ltd. (Note 19). (2) Financial Assets at fair value through profit or loss 1) Details of financial assets at fair value through profit or loss as of December 31, 2022 and 2023, are as follows: (in millions of Korean won) December 31, 2022 December 31, 2023 Equity Instruments (Listed) ￦ 26,647 ￦ 13,911 Equity Instruments (Unlisted) 72,517 42,185 Debt securities 942,274 880,549 Derivatives held for trading 1 23,418 3,016 Total 1,064,856 939,661 Less: non-current (609,887 ) (782,143 ) Current ￦ 454,969 ￦ 157,518 1 According to a derivative arrangement with LS Marine Solution Co., Ltd. (formerly KT Submarine Co., Ltd.), derivative assets amounting to ￦ 2) The maximum exposure of debt instruments of financial assets recognized at fair value through profit or loss to credit risk is the carrying amount as of December 31, 2023. (3) Financial Assets at fair value through other comprehensive income 1) Details of financial assets at fair value through other comprehensive income as of December 31, 2022 and 2023, are as follows: (in millions of Korean won) December 31, 2022 December 31, 2023 Equity Instruments (Listed) ￦ 1,006,476 ￦ 1,231,188 Equity Instruments (Unlisted) 496,284 443,067 Debt securities 5,432 5,913 Total 1,508,192 1,680,168 Less: non-current (1,508,192 ) (1,680,168 ) Current ￦ —  ￦ —  2) Upon disposal of these equity investments, any balance within the accumulated other comprehensive income for these equity investments is not classified to profit or loss, but to retained earnings. Upon disposal of these debt investments, the remaining balance of the accumulated other comprehensive income of debt investments is reclassified to profit or loss. (4) Derivatives used for hedging 1) Details of valu a December 31, 2022 December 31, 2023 (in millions of Korean won) Assets Liabilities Assets Liabilities Interest rate swap ￦ 4,236 ￦ — ￦ 1,530 ￦ 191 Currency swap 1 186,594 33,555 157,681 24,356 Total 190,830 33,555 159,211 24,547 Less: non-current (147,141 ) (33,555 ) (107,802 ) (23,696 ) Current ￦ 43,689 ￦ — ￦ 51,409 ￦ 851 1 The currency swap contract is to hedge the risk of variability in cash flow from the borrowings due to changes in interest rate and foreign exchange rate and the expected maximum period for the Group to be exposed to risks of cash flow fluctuation by hedged items is until September 7, 2034. The entire fair value of a hedging derivative is classified as a non-current asset or liability if the remaining maturity of the hedged item is more than 12 months and, as a current asset or liability, if the maturity of the hedged item is less than 12 months. 2) The valuation gains and losses on the derivatives contracts for the years ended December 31, 2021, 2022 and 2023, are as follows: (in millions of 2021 2022 2023 Type of Valuation gain Valuation loss Other comprehensive income 1 Valuation gain Valuation loss Other comprehensive income 1 Valuation gain Valuation Loss Other comprehensive income 1 Interest rate swap ￦ —  ￦ —  ￦ 1 ￦ 63 ￦ 490 ￦ 4,666 ￦ 48 ￦ —  ￦ (2,945 ) Currency swap 203,961 7,206 191,569 154,611 20,723 79,781 45,709 162 (27,273 ) Currency forwards —  —  —  —  —  754 — — — Total ￦ 203,961 ￦ 7,206 ￦ 191,570 ￦ 154,674 ￦ 21,213 ￦ 85,201 ￦ 45,757 ￦ 162 ￦ (30,218 ) 1 The amounts directly reflected in equity are before adjustments of deferred income tax and allocation to the non-controlling interest. 3) The ineffective portion recognized in profit or loss on the cash flow hedges are valuation loss of ￦ ￦ ￦ 4) The unsettled amount of derivative instruments for the years ended December 31, 2022 and 2023, are as follows: (i) Hedging instruments (in millions of Korean won and thousands of foreign currencies) 2022 Book value of hedging Changes in fair Currency Foreign Contract Assets Liabilities USD 2,111,509 ￦ 2,527,626 ￦ 160,243 ￦ 32,936 ￦ 170,856 JPY 400,000 4,357 —  409 (308 ) SGD 284,000 245,208 26,351 —  20,511 EUR 7,700 10,283 —  210 129 KRW —  170,000 4,236 —  4,717 Total     ￦ 2,957,474 ￦ 190,830 ￦ 33,555 ￦ 195,905 (in millions of Korean won 2023 Book value of hedging Changes in fair Currency Foreign Contract Assets Liabilities USD 2,011,509 ￦ 2,417,473 ￦ 157,681 ￦ 23,465 ￦ 44,413 JPY 400,000 4,357 —  660 (162 ) EUR 7,700 10,283 —  231 381 KRW —  240,000 1,530 191 707 Total —  ￦ 2,672,113 ￦ 159,211 ￦ 24,547 ￦ 45,339 (ii) Hedged item (in millions of Korean won) 2022 2023 Currency Book value Changes in fair Cash flow 1 Book value Changes in fair Cash flow 1 USD ￦ 2,675,885 ￦ (170,010 ) ￦ (13,947 ) ￦ 2,593,707 ￦ (44,365 ) ￦ (30,415 ) JPY 3,813 308 116 3,651 162 49 SGD 267,843 (18,720 ) 3,406 —  —  —  EUR 10,404 (121 ) 582 10,985 (581 ) 158 KRW 101,035 (4,655 ) 4,385 239,944 (596 ) 1,315 Total ￦ 3,058,980 ￦ (193,198 ) ￦ (5,458 ) ￦ 2,848,287 ￦ (45,380 ) ￦ (28,893 ) 1 The amount is after the deferred tax directly added or subtracted to the capital is reflected. (5) Financial Liabilities at fair value through profit or loss 1) Details of financial liabilities at fair value through profit or loss as of December 31, 2022 and 2023, are as follows: (in millions of Korean won) December 31, 2022 December 31, 2023 Derivatives held for trading 1,2 ￦ 141,280 ￦ 136,106 1 In relation to the additional acquisition of shares of the equity method investee K Bank Inc in 2021, the Group has entered into a shareholder agreement with the shareholders of K Bank Inc. According to the shareholder agreement, if K Bank Inc fails to be listed on the terms agreed in the shareholder agreement, the shareholders of K Bank Inc may exercise their Drag-Along right to the Group and require the Group to sell all the shares owned by such shareholders in K Bank to third parties based on the guaranteed return agreed in the shareholder agreement. The shareholder agreement also includes a call option where, if the shareholders exercise their Drag-Along rights, the Group has an option to purchase the shares held by those shareholders. As of December 31, 2023, the derivative financial liability in accordance with IFRS 9 associated with the rights prescribed in the shareholders agreement was ￦ ￦ 2 The amount includes derivatives separated from convertible bonds issued by the Group (Note 15). 2) The valuation gain and loss on financial liabilities at fair value through profit or loss for the years ended December 31, 2021, 2022 and 2023, are as follows: 2021 2022 2023 (in millions of Korean won) Valuation gain Valuation loss Valuation gain Valuation loss Valuation gain Valuation loss Derivatives liabilities held for trading ￦ 51,187 ￦ 8,741 ￦ 24,683 ￦ 1,800 ￦ 3,316 ￦ 10,710

Inventories

Inventories	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
Inventories	8. Inventories Inventories as at December 31, 2022 and 2023, are as follows: December 31, 2022 December 31, 2023 (in millions of Korean won) Acquisition Valuation Book amount Acquisition cost Valuation Allowance Book amount Merchandise ￦ 768,748 ￦ (96,010 ) ￦ 672,738 ￦ 981,127 ￦ (102,215 ) ￦ 878,912 Others 44,935 —  44,935 109,439 —  109,439 Total ￦ 813,683 ￦ (96,010 ) ￦ 717,673 ￦ 1,090,566 ￦ (102,215 ) ￦ 988,351 Cost of inventories recognized as expenses for the year ended December 31, 2023 amounts to ￦ ￦ ￦ ￦ million for the year ended December 31, 2023 (2021: reversal valuation loss on inventory amounts to ￦ million, 2022: reversal valuation loss on inventory amounts to ￦

Other Assets and Liabilities

Other Assets and Liabilities	12 Months Ended
	Dec. 31, 2023
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Other Assets and Liabilities	9. Other Assets and Liabilities Other assets and liabilities as at December 31, 2022 and 2023, are as follows: (in millions of Korean won) December 31, 2022 December 31, 2023 Other assets Advance payments ￦ 181,150 ￦ 217,997 Prepaid expenses 107,775 146,628 Contract cost 1,817,678 1,727,468 Contract assets 802,253 832,520 Others 12,964 15,237 Less: Non-current (820,608 ) (827,297 ) Current ￦ 2,101,212 ￦ 2,112,553 Other liabilities Advances received 1 ￦ 387,986 ￦ 682,880 Withholdings 155,017 159,080 Unearned revenue 1 46,493 27,392 Lease liabilities 1,172,038 1,179,909 Contract liabilities 284,107 278,749 Others 33,108 30,848 Less: Non-current (945,731 ) (950,015 ) Current ￦ 1,133,018 ￦ 1,408,843 1 The amounts include adjustments arising from adoption of IFRS 15 Revenue from Contracts with Customers

Property and Equipment

Property and Equipment	12 Months Ended
	Dec. 31, 2023
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Property and Equipment	10 Property and Equipment (1) Changes in property and equipment for the years ended December 31, 2022 and 2023, are as follows: 2022 (in millions of Korean won) Land Buildings Machinery Others Construction- Total Acquisition cost ￦ 1,315,929 ￦ 4,707,250 ￦ 40,270,005 ￦ 1,607,853 ￦ 1,094,479 ￦ 48,995,516 Less: Accumulated depreciation (including accumulated impairment loss and others) (132 ) (2,189,828 ) (30,953,434 ) (1,386,615 ) (621 ) (34,530,630 ) Beginning, net 1,315,797 2,517,422 9,316,571 221,238 1,093,858 14,464,886 Acquisition and capital expenditure 11,392 32,030 129,754 67,921 3,105,283 3,346,380 Disposal and termination (2,556 ) (4,338 ) (76,608 ) (4,695 ) (3,926 ) (92,123 ) Depreciation —  (147,620 ) (2,413,191 ) (79,376 ) —  (2,640,187 ) Impairment —  —  (6,084 ) (7,825 ) (2,247 ) (16,156 ) Transfer in (out) 1 24,647 230,955 2,660,753 31,036 (3,010,193 ) (62,802 ) Transfer from (to) investment properties (63,278 ) (140,229 ) —  —  (2,676 ) (206,183 ) Acquisition and disposition of businesses —  —  (4,386 ) (481 ) (3,720 ) (8,587 ) Others (13,194 ) 66,341 7,020 (4,382 ) (68,834 ) (13,049 ) Ending, net ￦ 1,272,808 ￦ 2,554,561 ￦ 9,613,829 ￦ 223,436 ￦ 1,107,545 ￦ 14,772,179 Acquisition cost ￦ 1,272,940 ￦ 4,830,853 ￦ 42,091,573 ￦ 1,276,779 ￦ 1,108,043 ￦ 50,580,188 Less: Accumulated depreciation (including accumulated impairment loss and others) (132 ) (2,276,292 ) (32,477,744 ) (1,053,343 ) (498 ) (35,808,009 ) 1 The amounts include the transferred amount to Intangible Assets account. 2023 (in millions of Korean won) Land Buildings and structures Machinery Others Construction- Total Acquisition cost ￦ 1,272,940 ￦ 4,830,853 ￦ 42,091,573 ￦ 1,276,779 ￦ 1,108,043 ￦ 50,580,188 Less: Accumulated depreciation (including accumulated impairment loss and others) (132 ) (2,276,292 ) (32,477,744 ) (1,053,343 ) (498 ) (35,808,009 ) Beginning, net 1,272,808 2,554,561 9,613,829 223,436 1,107,545 14,772,179 Acquisition and capital expenditure 844 5,072 75,412 78,400 3,029,380 3,189,108 Disposal and termination (3,651 ) (5,012 ) (70,418 ) (1,711 ) (327 ) (81,119 ) Depreciation —  (148,981 ) (2,495,402 ) (75,900 ) —  (2,720,283 ) Impairment —  —  (6,577 ) (1 ) (1,294 ) (7,872 ) Transfer in (out) 1 58,790 151,157 2,706,444 16,407 (3,092,670 ) (159,872 ) Transfer from (to) investment properties (37,725 ) (88,336 ) —  —  (189 ) (126,250 ) Acquisition and disposition of businesses 18,761 49,532 (14,981 ) (44,543 ) (3,205 ) 5,564 Others 14,549 137 (1,628 ) (7,742 ) (4,692 ) 624 Ending, net ￦ 1,324,376 ￦ 2,518,130 ￦ 9,806,679 ￦ 188,346 ￦ 1,034,548 ￦ 14,872,079 Acquisition cost ￦ 1,324,508 ￦ 4,903,073 ￦ 43,611,280 ￦ 1,182,144 ￦ 1,035,198 ￦ 52,056,203 Less: Accumulated depreciation (including accumulated impairment loss and others) (132 ) (2,384,943 ) (33,804,601 ) (993,798 ) (650 ) (37,184,124 ) 1 The amounts include the transferred amount to Intangible Assets account. (2) Details of property and equipment and investment properties provided as collateral as of December 31, 2022 and 2023, are as follows: (in millions of Korean won) December 31, 2022 Carrying Secured Related line Related Secured party Land and Buildings ￦ 13,899 ￦ 19,100 Borrowings ￦ 6,000 Industrial Land and Buildings ￦ 460,166 ￦ 61,733 Deposits ￦ 52,662 Lessee (in millions of Korean won) December 31, 2023 Carrying Secured Related line Related Secured party Land and Buildings ￦ 81,057 ￦ 64,680 Borrowings ￦ 54,900 Industrial Land and Buildings ￦ 555,921 ￦ 64,877 Deposits ￦ 55,965 Lessee (3) The borrowing costs capitalized for qualifying assets amount to ￦ ￦ ￦ for the year ended December 31, 2023. The range of interest rate applied to calculate the capitalized borrowing costs, for the year

Investment Properties

Investment Properties	12 Months Ended
	Dec. 31, 2023
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Investment Properties	11. Investment Properties (1) Changes in investment properties for the years ended December 31, 2022 and 2023, are as follows: 2022 (in millions of Korean won) Land Buildings Construction- in-progress Total Acquisition cost ￦ 815,331 ￦ 1,424,066 ￦ 66,801 ￦ 2,306,198 Less: Accumulated depreciation (1,568 ) (583,976 ) —  (585,544 ) Beginning, net 813,763 840,090 66,801 1,720,654 Acquisition 14,569 17,351 55,478 87,398 Disposal and termination (14,725 ) (5,858 ) (17 ) (20,600 ) Depreciation —  (47,004 ) —  (47,004 ) Transfer from(to) property and equipment 63,278 140,229 2,676 206,183 Transfer and others 2,907 (28,350 ) 12,170 (13,273 ) Ending, net ￦ 879,792 ￦ 916,458 ￦ 137,108 ￦ 1,933,358 Acquisition cost ￦ 881,360 ￦ 1,577,736 ￦ 137,108 ￦ 2,596,204 Less: Accumulated depreciation (1,568 ) (661,278 ) —  (662,846 ) 2023 (in millions of Korean won) Land Buildings Construction- Total Acquisition cost ￦ 881,360 ￦ 1,577,736 ￦ 137,108 ￦ 2,596,204 Less: Accumulated depreciation (1,568 ) (661,278 ) —  (662,846 ) Beginning, net 879,792 916,458 137,108 1,933,358 Acquisition —  57,529 153,279 210,808 Disposal and termination (8,167 ) (9,323 ) —  (17,490 ) Depreciation —  (52,869 ) —  (52,869 ) Transfer from(to) property and equipment 37,725 88,336 189 126,250 Transfer and others 1 27,544 (29,467 ) (1,922 ) Ending, net ￦ 909,351 ￦ 1,027,675 ￦ 261,109 ￦ 2,198,135 Acquisition cost ￦ 910,919 ￦ 1,750,677 ￦ 261,109 ￦ 2,922,705 Less: Accumulated depreciation (1,568 ) (723,002 ) —  (724,570 ) (2) The fair value of investment properties is ￦ ￦ (3) Rental income from investment properties is ￦ ￦ ￦ . Th e (4) As of December 31, 2023, the Group (Lessor) has entered into a non-cancellable operating lease contract relating to real estate lease. The future minimum lease fee under this contract is ￦ ￦ ￦ ￦

Intangible Assets

Intangible Assets	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
Intangible Assets	12. Intangible Assets (1) Changes in intangible assets for the years ended December 31, 2022 and 2023, are as follows: 2022 (in millions of Korean won) Goodwill Development Software Frequency usage rights Others Total Acquisition cost ￦ 1,002,530 ￦ 1,812,377 ￦ 1,083,426 ￦ 2,617,647 ￦ 1,426,576 ￦ 7,942,556 Less: Accumulated amortization (including accumulated impairment loss and others) (305,658 ) (1,584,004 ) (944,001 ) (778,516 ) (883,044 ) (4,495,223 ) Beginning, net ￦ 696,872 ￦ 228,373 ￦ 139,425 ￦ 1,839,131 ￦ 543,532 ￦ 3,447,333 Acquisition and capital expenditure 19,455 45,997 55,651 —  225,886 346,989 Disposal and termination —  (5,503 ) (48 ) —  (20,117 ) (25,668 ) Amortization —  (93,374 ) (54,748 ) (350,265 ) (128,874 ) (627,261 ) Impairment (24,006 ) (744 ) (508 ) —  (5,416 ) (30,674 ) Acquisition and disposition of businesses —  (2,320 ) (802 ) —  (7,144 ) (10,266 ) Others 15,902 (573 ) 16,106 (610 ) (1,445 ) 29,380 Ending, net ￦ 708,223 ￦ 171,856 ￦ 155,076 ￦ 1,488,256 ￦ 606,422 ￦ 3,129,833 Acquisition cost 1,037,887 1,803,687 1,156,951 2,617,707 1,532,061 8,148,293 Less: Accumulated amortization (including accumulated impairment loss and others) (329,664 ) (1,631,831 ) (1,001,875 ) (1,129,451 ) (925,639 ) (5,018,460 ) 2023 (in millions of Korean won) Goodwill Development Software Frequency usage rights Others Total Acquisition cost ￦ 1,037,887 ￦ 1,803,687 ￦ 1,156,951 ￦ 2,617,707 ￦ 1,532,061 ￦ 8,148,293 Less: Accumulated amortization (including accumulated impairment loss and others) (329,664 ) (1,631,831 ) (1,001,875 ) (1,129,451 ) (925,639 ) (5,018,460 ) Beginning, net 708,223 171,856 155,076 1,488,256 606,422 3,129,833 Acquisition and capital expenditure 1 —  33,078 38,603 37 238,019 309,737 Disposal and termination —  (4,812 ) (397 ) —  (6,431 ) (11,640 ) Amortization 2 —  (63,052 ) (52,265 ) (350,276 ) (226,316 ) (691,909 ) Impairment (230,352 ) (128 ) (16 ) —  (5,711 ) (236,207 ) Acquisition and disposition of businesses 6,207 —  (108 ) —  (69 ) 6,030 Others 4,349 1,658 11,769 175 10,066 28,017 Ending, net ￦ 488,427 ￦ 138,600 ￦ 152,662 ￦ 1,138,192 ￦ 615,980 ￦ 2,533,861 Acquisition cost ￦ 1,036,354 ￦ 1,790,446 ￦ 1,196,329 ￦ 2,415,243 ￦ 1,725,087 ￦ 8,163,459 Less: Accumulated amortization (including accumulated impairment loss and others) (547,927 ) (1,651,846 ) (1,043,667 ) (1,277,051 ) (1,109,107 ) (5,629,598 ) 1 The amounts include the transferred amount from Property and Equipment account. 2 Amounts include ￦ (2) Goodwill, amounting to ￦ million, is not subject to amortization as of December 31, 2023 (December 31, 2022: ￦ million). (3) Goodwill is allocated to the Group’s cash-generating unit which is identified by operating segments. As of December 31, 2023, goodwill allocated to each cash-generating unit is as follows: (in millions of Korean won) Cash generating Unit Amount Mobile services 1,9 ￦ 65,057 BC Card Co., Ltd. 2 41,234 HCN Co., Ltd. 3 130,242 GENIE Music Corporation 4 50,214 MILLIE Co., Ltd. 5 54,725 PlayD Co., Ltd. 6 40,068 KT Telecop Co., Ltd. 7 15,418 Epsilon Global Communications Pte. Ltd. 8 45,670 KT MOS Bukbu Co., Ltd and others 45,799 Total ￦ 488,427 1 The recoverable amounts of mobile services business are calculated based on value-in use calculations. These calculations use discounted cash flow projections for the next five years based on financial budgets. A terminal growth rate of 0.0% was applied for the cash flows expected to be incurred after five years. This growth rate does not exceed the average growth rate of the industry which the cash-generating unit belongs in. The Group estimated its revenue growth rate 0.56% based on past performance and its expectation of future market changes. In addition, management estimated the cash flow based on past performance and its expectation of market growth, and the discount rates 6.68% used reflected specific risks relating to the relevant CGU. As a result of the impairment test, the Group concluded that the carrying amount of CGU does not exceed the recoverable amount. Accordingly, the Group did not recognize an impairment loss on goodwill on mobile business for the years ended December 31, 2021, 2022 and 2023. 2 The recoverable amounts of BC Card Co., Ltd. are calculated based on value-in use calculations. These calculations use discounted cash flow projections for the next five years based on financial budgets. A terminal growth rate of 0.0% was applied for the cash flows expected to be incurred after five years. This growth rate does not exceed the average growth rate of the industry which the cash-generating unit belongs in. The Group estimated its revenue growth rate 0.04% based on past performance and its expectation of future market changes. In addition, management estimated the cash flow based on past performance and its expectation of market growth, and the discount rates 5.22% used reflected specific risks relating to the relevant CGU. As a result of the impairment test, the Group concluded that the carrying amount of CGU does not exceed the recoverable amount. Accordingly, the Group did not recognize an impairment loss on goodwill on BC Card Co., Ltd. for the years ended December 31, 2021, 2022 and 2023. 3 The recoverable amounts of HCN Co., Ltd. are calculated based on value-in use calculations. These calculations use discounted cash flow projections for the next five years based on financial budgets. A terminal growth rate of 0.0% was applied for the cash flows expected to be incurred after five years. This growth rate does not exceed the average growth rate of the industry which the cash-generating unit belongs in. The Group estimated its revenue growth rate 2.21% based on past performance and its expectation of future market changes. In addition, management estimated the cash flow based on past performance and its expectation of market growth, and the discount rates 11.37% used reflected specific risks relating to the relevant CGU. As a result of the impairment test, HCN’s recoverable amount was KRW 130,242 million, which was less than the carrying amount, and KRW 98,432 million of the impairment loss was record operating 4 The recoverable amounts of GENIE Music Corporation are calculated based on value-in use calculations. These calculations use discounted cash flow projections for the next five years based on financial budgets. A terminal growth rate of 0.0% was applied for the cash flows expected to be incurred after five years. This growth rate does not exceed the average growth rate of the industry which the cash-generating unit belongs in. The Group estimated its revenue growth rate 4.51% based on past performance and its expectation of future market changes. In addition, management estimated the cash flow based on past performance and its expectation of market growth, and the discount rates 16.73% used reflected specific risks relating to the relevant CGU. As a result of the impairment test, the Group concluded that the carrying amount of CGU does not exceed the recoverable amount. Accordingly, the Group did not recognize an impairment loss on goodwill on GENIE Music Corporation for the years ended December 31, 2023. 5 The recoverable amounts of MILLIE Co., Ltd. are calculated based on value-in use calculations. These calculations use discounted cash flow projections for the next four years based on financial budgets. A terminal growth rate of 1.0% was applied for the cash flows expected to be incurred after four years. This growth rate does not exceed the average growth rate of the industry which the cash-generating unit belongs in. The Group estimated its revenue growth rate 9.96% based on past performance and its expectation of future market changes. In addition, management estimated the cash flow based on past performance and its expectation of market growth, and the discount rates 22.48% used reflected specific risks relating to the relevant CGU. As a result of the impairment test, the Group concluded that the carrying amount of CGU does not exceed the recoverable amount. Accordingly, the Group did not recognize an impairment loss on goodwill on MILLIE Co., Ltd. for the years ended December 31, 2023. 6 The recoverable amount of PlayD Co., Ltd is calculated based on fair value less cost to sell. 7 The recoverable amounts of KT Telecop Co., Ltd. are calculated based on value-in use calculations. These calculations use discounted cash flow projections for the next five years based on financial budgets. A terminal growth rate of 1.0% was applied for the cash flows expected to be incurred after five years. This growth rate does not exceed the average growth rate of the industry which the cash-generating unit belongs in. The Group estimated its revenue growth rate 3.54% based on past performance and its expectation of future market changes. In addition, management estimated the cash flow based on past performance and its expectation of market growth, and the discount rates 9.04% used reflected specific risks relating to the relevant CGUs. As a result of the impairment test, the Group concluded that the carrying amount of CGU does not exceed the recoverable amount. Accordingly, the Group did not recognize an impairment loss on goodwill on KT Telecop Co., Ltd. for the years ended December 31, 2021, 2022 and 2023. 8 The recoverable amounts of Epsilon Global Communications Pte. Ltd. are calculated based on value-in use calculations. These calculations use discounted cash flow projections for the next nine years based on financial budgets. A terminal growth rate of 1.0% was applied for the cash flows expected to be incurred after nine years. This growth rate does not exceed the average growth rate of the industry which the cash-generating unit belongs in. The Group estimated its revenue growth rate 10.57% based on past performance and its expectation of future market changes. In addition, management estimated the cash flow based on past performance and its expectation of market growth, and the discount rates 8.84% used reflected specific risks relating to the relevant CGU. As a result of the impairment test, Epsilon Global Communications’s recoverable amount was KRW 45,670 million, which was less than the carrying amount, and KRW 118,609 million of the impairment loss was record ope rating 9 The Group performed its impairment assessment for long-lived assets attributed to the Information and Communication Technology (“ICT”) reporting segment, which includes the Cash-Generating Units of Mobile, Fixed line, and Corporate Services (the “CGUs”). The Group compared the carrying value of each CGU to the estimated recoverable amount. The recoverable amounts of ICT reporting segment are calculated based on value-in use calculations. These calculations use discounted cash flow projections for the next five years based on financial budgets. A terminal growth rate of 0.0% was applied for the cash flows expected to be incurred after five years. This growth rate does not exceed the average growth rate of the industry which the cash-generating unit belongs in. The Group estimated its revenue growth rate 0.56% ~ 9.14% based on past performance and its expectation of future market changes. In addition, management estimated the cash flow based on past performance and its expectation of market growth, and the discount rate 6.68%. Accordingly, the Group did not recognize an impairment loss on ICT reporting segment for the years ended December 31, 2021, 2022 and 2023.

Investments in Associates and J

Investments in Associates and Joint Ventures	12 Months Ended
	Dec. 31, 2023
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Investments in Associates and Joint Ventures	13. Investments in Associates and Joint Ventures (1) Details of associates as of December 31, 2022 and 2023, are as follows:  Percentage of ownership (%)  Location Closing December 31, 2022 December 31, 2023 KIF Investment Fund 33.3 % 33.3 % Korea December K Bank Inc. 33.7 % 33.7 % Korea December HD Hyundai Robotics Co., Ltd. (formerly Hyundai Robotics Co., Ltd.) 1 10.0 % 10.0 % Korea December Megazone Cloud Corporation 1 6.8 % 6.8 % Korea December IGIS No. 468-1 General Private Real Estate Investment Company 44.6 % 44.6 % Korea December KT-DSC Creative Economy Youth Start-up Investment Fund 28.6 % 28.6 % Korea December IGIS Professional Investors Private Investment Real Estate Investment LLCNo 395 35.3 % 35.3 % Korea December LS Marine Solution Co., Ltd (formerly KT Submarine Co., Ltd.). 1, 2 32.9 % 7.3 % Korea December 1 As of December 31, 2023, although the Group has less than 20 2 As of December 31, 2023, due to the loss of control of an entity, it is now accounted as an associate. (2) Changes in investments in associates and joint ventures for the years ended December 31, 2022 and 2023, are as follows: 2022 (in millions of Korean won) Beginning Acquisition (Disposal) Share of net profit Others Ending KIF Investment Fund ￦ 178,935 ￦ —  ￦ 2,502 ￦ (10,458 ) ￦ 170,979 K Bank Inc. 831,737 —  29,010 (7,991 ) 852,756 HD Hyundai Robotics Co., Ltd. (formerly Hyundai Robotics Co., Ltd.) 48,725 —  798 (151 ) 49,372 Megazone Cloud Corporation —  130,001 (22,555 ) 28,753 136,199 IGIS No. 468-1 General Private Real Estate Investment Company —  25,000 (1,411 ) —  23,589 KT-DSC Creative Economy Youth Start-up Investment Fund 22,138 —  (13 ) (2 ) 22,123 IGIS Professional Investors Private Investment Real Estate Investment LLC No. 395 17,084 —  (464 ) —  16,620 Others 189,810 100,040 (24,688 ) (56,078 ) 209,084 ￦ 1,288,429 ￦ 255,041 ￦ (16,821 ) ￦ (45,927 ) ￦ 1,480,722 2023 (in millions of Korean won) Beginning Acquisition (Disposal) Share of net profit 1 Others Ending KIF Investment Fund ￦ 170,979 ￦ —  ￦ 5,443 ￦ 632 ￦ 177,054 K Bank Inc. 852,756 —  1,089 19,036 872,881 HD Hyundai Robotics Co., Ltd. (formerly Hyundai Robotics Co., Ltd.) 49,372 —  (1,637 ) (1 ) 47,734 Megazone Cloud Corporation 136,199 —  (4,583 ) 78 131,694 IGIS No. 468-1 General Private Real Estate Investment Company 23,589 —  (105 ) —  23,484 KT-DSC Creative Economy Youth Start-up Investment Fund 22,123 (500 ) 3,494 —  25,117 IGIS Professional Investors Private Investment Real Estate Investment LLC No 395 16,620 —  (4,678 ) —  11,942 LS Marine Solution Co., Ltd (formerly KT Submarine Co., Ltd.) —  —  255 23,237 1 23,492 Others 209,084 101,887 (34,912 ) (32,568 ) 243,491 ￦ 1,480,722 ￦ 101,387 ￦ (35,634 ) ￦ 10,414 ￦ 1,556,889 1 The amount represents the fair value of investment at the time the Company lost control (Refer to note above). (3) Summarized financial information of associates and joint ventures as at and for the years ended December 31, 2022 and 2023, is as follows: (in millions of Korean won) December 31, 2022 Current Non-current assets Current Non-current liabilities KIF Investment Fund ￦ 98,132 ￦ 414,804 ￦ —  ￦ —  K Bank Inc. 16,562,742 71,265 14,830,983 2,168 HD Hyundai Robotics Co., Ltd. (formerly Hyundai Robotics Co., Ltd.). 278,413 135,380 63,009 64,335 Megazone Cloud Corporation 857,089 202,767 330,619 94,202 IGIS No. 468-1 General Private Real Estate Investment Company 52,851 —  12 —  KT-DSC Creative Economy Youth Start-up Investment Fund 908 76,884 362 —  IGIS Professional Investors Private Investment Real Estate Investment LLC No. 395 9,344 127,321 90,545 —  (in millions of Korean won) December 31, 2023 Current Non-current assets Current Non-current liabilities KIF Investment Fund ￦ 128,344 ￦ 402,819 ￦ —  ￦ —  K Bank Inc. 21,320,790 89,812 19,541,076 4,516 HD Hyundai Robotics Co., Ltd. 251,868 134,424 106,557 9,775 Megazone Cloud Corporation 874,778 267,605 341,679 205,087 IGIS No. 468-1 General Private Real Estate Investment Company 2,985 49,631 11 —  KT-DSC Creative Economy Youth Start-up Investment Fund 482 87,528 101 —  IGIS Professional Investors Private Investment Real Estate Investment LLC No 395 5,690 145,769 107,553 —  LS Marine Solution Co., Ltd. (formerly KT Submarine Co., Ltd.) 66,767 80,307 23,906 207 (in millions of Korean won) 2022 Operating Profit (loss) Other Total Dividends KIF Investment Fund ￦ 19,916 ￦ 7,505 ￦ (11,779 ) ￦ (4,274 ) ￦ 6,531 K Bank Inc. 558,872 86,498 (24,888 ) 61,610 —  HD Hyundai Robotics Co., Ltd. (formerly Hyundai Robotics Co., Ltd.). 181,944 9,332 (49 ) 9,283 —  Megazone Cloud Corporation 1,261,228 (293,186 ) (6,609 ) (299,795 ) —  IGIS No. 468-1 General Private Real Estate Investment Company 9 (3,161 ) —  (3,161 ) —  KT-DSC Creative Economy Youth Start-up Investment Fund 19,931 (53 ) —  (53 ) —  IGIS Professional Investors Private Investment Real Estate Investment LLC No. 395 —  (474 ) —  (474 ) —  (in millions of Korean won) 2023 Operating Profit (loss) Other Total Dividends KIF Investment Fund ￦ 33,017 ￦ 16,330 ￦ —  ￦ 16,330 ￦ 1,139 K Bank Inc. 946,559 10,560 56,609 67,169 —  HD Hyundai Robotics Co., Ltd. (formerly Hyundai Robotics Co., Ltd.). 167,949 (17,513 ) (1,093 ) (18,606 ) —  Megazone Cloud Corporation 1,410,078 (34,760 ) (3,021 ) (37,781 ) —  IGIS No. 468-1 General Private 6 (234 ) —  (234 ) —  KT-DSC Creative Economy Youth Start-up Investment Fund 19,849 12,227 —  12,227 —  IGIS Professional Investors Private Investment Real Estate —  (406 ) —  (406 ) —  LS Marine Solution Co., Ltd 70,779 11,618 (289 ) 11,329 —  (4) Details of a reconciliation of the summarized financial information to the carrying amount of interests in the associates and joint ventures as at and for the years ended December 31, 2022 and 2023, are as follows: (in millions of Korean won) 2022 Net assets (a) Percentage of (b) Share in net (c)=(a)x(b) Intercompany Book amount (c)+(d) KIF Investment Fund ￦   512,936 33.33 % ￦ 170,979 ￦ —  ￦ 170,979 K Bank Inc. 1,800,856 33.72 % 607,276 245,480 852,756 HD Hyundai Robotics Co., Ltd. (formerly Hyundai Robotics Co., Ltd.) 286,449 10.00 % 28,645 20,727 49,372 Megazone Cloud Corporation 635,035 6.83 % 43,360 92,839 136,199 IGIS No. 468-1 General Private Real Estate Investment Company 52,839 44.64 % 23,589 —  23,589 KT-DSC Creative Economy Youth Start-up Investment Fund 77,430 28.57 % 22,123 —  22,123 IGIS Professional Investors Private Investment Real Estate Investment LLC No. 395 46,120 35.29 % 16,278 342 16,620 (in millions of Korean won) 2023 Net assets (a) Percentage of (b) Share in net (c)=(a)x(b) Intercompany Book amount (c)+(d) KIF Investment Fund ￦ 531,164 33.33 % ￦ 177,054 ￦ —  ￦ 177,054 K Bank Inc. 1,865,010 33.72 % 628,910 243,971 872,881 HD Hyundai Robotics Co., Ltd. (formerly Hyundai Robotics Co., Ltd.) 269,960 10.00 % 26,996 20,738 47,734 Megazone Cloud Corporation 547,786 6.83 % 37,404 94,290 131,694 IGIS No. 468-1 General Private Real Estate Investment Company 52,605 44.64 % 23,484 —  23,484 KT-DSC Creative Economy Youth Start-up Investment Fund 87,908 28.57 % 25,117 —  25,117 IGIS Professional Investors Private Investment Real Estate Investment LLC No 395 43,905 35.29 % 15,496 (3,554 ) 11,942 LS Marine Solution Co., Ltd (formerly KT Submarine Co., Ltd.) 122,961 7.30 % 8,972 14,520 23,492 (5) Due to discontinuance of equity method of accounting, the Group has not recognized loss from associates and joint ventures of ￦ ￦ ￦ , ￦ ￦

Trade and Other Payables

Trade and Other Payables	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
Trade and Other Payables	14. Trade and Other Payables (1) Details of trade and other payables as of December 31, 2022 and 2023, are as follows: (in millions of Korean won) December 31, December 31, Current liabilities Trade payables ￦ 1,150,515 ￦ 1,297,752 Other payables 6,182,650 6,757,170 Total ￦ 7,333,165 ￦ 8,054,922 Non-current liabilities Trade payables ￦ —  ￦ 3,202 Other payables 1,064,099 816,356 Total ￦ 1,064,099 ￦ 819,558 (2) Details of other payables as of December 31, 2022 and 2023 are as follows: (in millions of Korean won) December 31, December 31, Non-trade payables 1 ￦ 4,981,300 ￦ 5,207,165 Accrued expenses 1,234,023 1,267,700 Operating deposits 818,603 880,810 Others 212,823 217,851 Less: non-current (1,064,099 ) (816,356 ) Current ￦ 6,182,650 ￦ 6,757,170 1 As of December 31, 2023, credit sale liabilities amounting to ￦ ￦

Borrowings

Borrowings	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
Borrowings	15. Borrowings (1) Details of borrowings as of December 31, 2022 and 2023, are as follows: 1) Debentures (in millions of Korean won and foreign currencies in thousands) December 31, 2022 December 31, 2023 Type Maturity Annual interest Foreign Korean Foreign Korean MTNP notes 1 Sep. 7, 2034 6.500% USD 100,000 ￦ 126,730 USD 100,000 ￦ 128,940 MTNP notes Jul. 18, 2026 2.500% USD 400,000 506,920 USD 400,000 515,760 MTNP notes Aug. 23, 2023 —  USD 100,000 126,730 —  —  MTNP notes Jul. 19, 2024 0.330% JPY 400,000 3,813 JPY 400,000 3,651 MTNP notes Sep. 1. 2025 1.000% USD 400,000 506,920 USD 400,000 515,760 FR notes 2 Nov. 1, 2024 Compounded SOFR+1.210% USD 350,000 443,555 USD 350,000 451,290 FR notes Jun. 19, 2023 —  SGD 284,000 267,843 —  —  MTNP notes Jan. 21, 2027 1.375% USD 300,000 380,190 USD 300,000 386,820 MTNP notes Aug. 08, 2025 4.000% USD 500,000 633,650 USD 500,000 644,700 The 183-3rd Public bond Dec. 22, 2031 4.270% —  160,000 —  160,000 The 184-2nd Public bond Apr. 10, 2023 —  —  190,000 —  —  The 184-3rd Public bond Apr. 10, 2033 3.170% —  100,000 —  100,000 The 186-3rd Public bond Jun. 26, 2024 3.418% —  110,000 —  110,000 The 186-4th Public bond Jun. 26, 2034 3.695% —  100,000 —  100,000 The 187-3rd Public bond Sep. 2, 2024 3.314% —  170,000 —  170,000 The 187-4th Public bond Sep. 2, 2034 3.546% —  100,000 —  100,000 The 188-2nd Public bond Jan. 29, 2025 2.454% —  240,000 —  240,000 The 188-3rd Public bond Jan. 29, 2035 2.706% —  50,000 —  50,000 The 189-3rd Public bond Jan. 28, 2026 2.203% —  100,000 —  100,000 The 189-4th Public bond Jan. 28, 2036 2.351% —  70,000 —  70,000 The 190-2nd Public bond Jan. 30, 2023 —  —  150,000 —  —  The 190-3rd Public bond Jan. 30, 2028 2.947% —  170,000 —  170,000 The 190-4th Public bond Jan. 30, 2038 2.931% —  70,000 —  70,000 The 191-2nd Public bond Jan. 15, 2024 2.088% —  80,000 —  80,000 The 191-3rd Public bond Jan. 15, 2029 2.160% —  110,000 —  110,000 The 191-4th Public bond Jan. 14, 2039 2.213% —  90,000 —  90,000 The 192-2nd Public bond Oct. 11, 2024 1.578% —  100,000 —  100,000 The 192-3rd Public bond Oct. 11, 2029 1.622% —  50,000 —  50,000 The 192-4th Public bond Oct. 11, 2039 1.674% —  110,000 —  110,000 The 193-1st Public bond Jun. 16, 2023 —  —  150,000 —  —  The 193-2nd Public bond Jun. 17, 2025 1.434% —  70,000 —  70,000 The 193-3rd Public bond Jun. 17, 2030 1.608% —  20,000 —  20,000 The 193-4th Public bond Jun. 15, 2040 1.713% —  60,000 —  60,000 (in millions of Korean won and foreign currencies in thousands) December 31, 2022 December 31, 2023 Type Maturity Annual interest Foreign Korean Foreign Korean The 194-1st Public bond Jan. 26, 2024 1.127% —  130,000 —  130,000 The 194-2nd Public bond Jan. 27, 2026 1.452% —  140,000 —  140,000 The 194-3rd Public bond Jan. 27, 2031 1.849% —  50,000 —  50,000 The 194-4th Public bond Jan. 25, 2041 1.976% —  80,000 —  80,000 The 195-1st Public bond Jun. 10, 2024 1.387% —  180,000 —  180,000 The 195-2nd Public bond Jun. 10, 2026 1.806% —  80,000 —  80,000 The 195-3rd Public bond Jun. 10, 2031 2.168% —  40,000 —  40,000 The 196-1st Public bond Jan. 27, 2025 2.596% —  270,000 —  270,000 The 196-2nd Public bond Jan. 27, 2027 2.637% —  100,000 —  100,000 The 196-3rd Public bond Jan. 27, 2032 2.741% —  30,000 —  30,000 The 197-1st Public bond Jun. 27, 2025 4.191% —  280,000 —  280,000 The 197-2nd Public bond Jun. 29, 2027 4.188% —  120,000 —  120,000 The 198-1st Public bond Jan. 10, 2025 3.847% —  —  —  70,000 The 198-2nd Public bond Jan. 12, 2026 3.869% —  —  —  150,000 The 198-3rd Public bond Jan. 12, 2028 3.971% —  —  —  80,000 The 199-1st Public bond Jul. 11, 2025 4.028% —  —  —  85,000 The 199-2nd Public bond Jul. 10, 2026 4.146% —  —  —  160,000 The 199-3rd Public bond Jul. 12, 2028 4.221% —  —  —  155,000 The 18-1st unsecured bond Jul. 2, 2024 1.844% —  100,000 —  100,000 The 18-2nd unsecured bond Jul. 2, 2026 2.224% —  50,000 —  50,000 The 148th Won-denominated unsecured bond Jun. 23, 2023 —  —  100,000 —  —  The 149-1st Won-denominated unsecured bond Mar. 8, 2024 1.440% —  70,000 —  70,000 The 149-2nd Won-denominated unsecured bond Mar. 10, 2026 1.756% —  30,000 —  30,000 The 150-1st Won-denominated unsecured bond Apr. 7, 2023 —  —  20,000 —  —  The 150-2nd Won-denominated unsecured bond Apr. 8, 2024 1.462% —  30,000 —  30,000 The 151-1st Won-denominated unsecured bond May 12, 2023 —  —  10,000 —  —  The 151-2nd Won-denominated unsecured bond May 14, 2024 1.432% —  40,000 —  40,000 The 152-1st Won-denominated unsecured bond Aug. 30, 2024 1.813% —  80,000 —  80,000 The 152-2nd Won-denominated unsecured bond Aug. 28, 2026 1.982% —  20,000 —  20,000 The 153-1st Won denominated unsecured bond Nov. 10, 2023 —  —  30,000 —  —  The 153-2nd Won-denominated unsecured bond Nov. 11, 2024 2.425% —  70,000 —  70,000 The 154th Won-denominated unsecured bond Jan. 23, 2025 2.511% —  40,000 —  40,000 The 155-1st Won-denominated unsecured bond Feb. 29, 2024 2.615% —  50,000 —  50,000 The 155-2nd Won-denominated unsecured bond Sep. 2, 2024 2.745% —  20,000 —  20,000 The 155-3rd Won-denominated unsecured bond Feb. 28, 2025 2.880% —  20,000 —  20,000 The 156-1st Won-denominated unsecured bond 3 Mar. 25, 2025 5Y CMS+0.404% —  60,000 —  60,000 (in millions of Korean won and foreign currencies in thousands) December 31, 2022 December 31, 2023 Type Maturity Annual interest Foreign Korean Foreign Korean The 156-2nd Won-denominated unsecured bond 3 Mar. 25, 2032 10Y CMS+0.965% —  40,000 —  40,000 The 157-1st Won-denominated unsecured bond Apr. 28, 2023 —  —  30,000 —  —  The 157-2nd Won-denominated unsecured bond Oct. 27, 2023 —  —  30,000 —  —  The 158th Won-denominated unsecured bond Jan. 27, 2025 4.421% —  50,000 —  50,000 The 159-1st Won-denominated unsecured bond Aug. 09, 2024 4.267% —  30,000 —  30,000 The 159-2nd Won-denominated unsecured bond Aug. 11, 2027 4.505% —  30,000 —  30,000 The 160-1st Won-denominated unsecured bond Jun. 14, 2024 5.615% —  20,000 —  20,000 The 160-2nd Won-denominated unsecured bond Dec. 13, 2024 5.667% —  20,000 —  20,000 The 160-3rd Won-denominated unsecured bond Dec. 12, 2025 5.769% —  30,000 —  30,000 The 161-1st Won-denominated unsecured bond Jun. 21, 2024 5.527% —  10,000 —  10,000 The 161-2nd Won-denominated unsecured bond Dec. 20, 2024 5.557% —  20,000 —  20,000 The 161-3rd Won-denominated unsecured bond Jun. 20, 2025 5.594% —  30,000 —  30,000 The 161-4th Won-denominated unsecured bond Dec. 22, 2025 5.615% —  10,000 —  10,000 The 162-1st Won-denominated unsecured bond Dec. 27, 2023 —  —  50,000 —  —  The 162-2nd Won-denominated unsecured bond Jan. 26, 2024 5.069% —  40,000 —  40,000 The 162-3rd Won-denominated unsecured bond Apr. 26, 2024 5.080% —  10,000 —  10,000 The 163-1st Won-denominated unsecured bond Feb. 20, 2026 4.059% —  —  —  20,000 The 163-2nd Won-denominated unsecured bond Feb. 22, 2028 4.311% —  —  —  80,000 The 164-1st Won-denominated unsecured bond Apr. 12, 2024 3.778% —  —  —  10,000 The 164-2nd Won-denominated unsecured bond Oct. 24, 2024 3.821% —  —  —  30,000 The 164-3rd Won-denominated unsecured bond Apr. 14, 2028 4.220% —  —  —  30,000 The 165-1st Won-denominated unsecured bond May. 09, 2025 3.870% —  —  —  30,000 The 165-2nd Won-denominated unsecured bond Nov. 09, 2026 3.932% —  —  —  10,000 The 165-3rd Won-denominated unsecured bond May. 07, 2027 3.972% —  —  —  30,000 The 166-1st Won-denominated unsecured bond Nov. 22. 2024 4.205% —  —  —  20,000 The 166-2nd Won-denominated unsecured bond Apr. 22. 2025 4.310% —  —  —  40,000 The 166-3rd Won-denominated unsecured bond May. 21. 2025 4.332% —  —  —  10,000 The 166-4th Won-denominated unsecured bond May. 22. 2025 4.332% —  —  —  40,000 The 167-1st Won-denominated unsecured bond Dec. 20. 2024 3.865% —  —  —  30,000 The 167-2nd Won-denominated unsecured bond Jan. 22. 2025 3.864% —  —  —  50,000 The 167-3rd Won-denominated unsecured bond Feb. 21. 2025 3.864% —  —  —  10,000 The 167-4th Won-denominated unsecured bond Dec. 22. 2025 3.858% —  —  —  10,000 Subtotal 8,406,351 8,446,921 Less: Current portion (1,154,101 ) (1,924,523 ) Discount on bonds (23,728 ) (19,248 ) Total ￦ 7,228,522 ￦ 6,503,150 1 As of December 31, 2023, the Controlling Company has outstanding notes in the amount of USD 100 million with fixed interest rates under Medium Term Note Program (“MTNP”) registered in the Singapore Stock Exchange, which allowed issuance of notes of up to USD 2,000 million. However, the MTNP has been terminated since 2007. 2 The Daily SOFR is approximately 5.380% as of December 31, 2023. Due to the recent suspension of LIBOR calculation, the Group changed the alternative indicator interest rate to Compounded SOFR+ 1.210 3 The CMS (5Y) and CMS (10Y) is approximately 2.993% and 2.990%, respectively as of December 31, 2023. 2 Convertible bonds (in millions of Korean won) Type Issuance Date Maturity Annual December 31, December 31, The 1st CB (Private) 1 Jun. 5, 2020 Jun. 5, 2025 2 ￦ 8,000 ￦ 8,000 The 1st unsecured CB 3 Jul. 25, 2022 Jan. 25, 2025 —  30,000 —  Redemption premium 4,565 2,267 Bond discount issuance (7,206 ) (1,811 ) Subtotal 35,359 8,456 Current portion —  (8,456 ) Total ￦ 35,359 ￦ —  1 Common shares of Storywiz are subject to conversion (appraisal period: June 5, 2021~May 4, 2025). 2 Nominal interest rate and maturity yield is approximately 0% and 5%, respectively, and will be settled on maturity. 3 During the current period, bonds of kt cloud are converted to 73,800 of Common shares and 73,800 of preference shares. 3 Borrowings a. Short-term borrowings (in millions of Korean won) December 31, 2022 December 31, 2023 Type Financial institution Annual interest Foreign currency Korean won Foreign currency Korean won Operational Shinhan Bank 3.840%~6.430% —  ￦ 105,000 —  ￦ 151,500 —  —  30,000 —  —  Woori Bank 1, —  —  50,000 —  —  4.400% —  70,000 CD(91D)+1.960% —  —  —  20,000 Korea Development Bank 3.230%~4.950% —  27,201 —  34,900 Industrial Bank of Korea 4.862% —  6,000 —  6,000 Hana Bank 1 CD(91D)+0.126% —  5,000 —  4,800 KB SECURITIES 4.110%~4.910% —  94,822 —  69,635 NH INVESTMENT & SECURITIES —  —  20,000 —  —  HSBC 2 Compounded SOFR +2.100% USD 18,500 23,451 USD 23,600 30,450 NongHyup Bank 4.880% —  9,000 —  8,500 —  —  15,000 —  —  IBK Securities —  —  20,000 —  —  Hi Investment & Securities —  —  99,524 —  —  Korea Investment 4.910% —  —  30,000 Total ￦ 504,998 ￦ 425,785 1 CD (91D) is approximately 3.820% as of December 31, 2023. 2 The Daily SOFR is approximately 5.380% as of December 31, 2023. b. Long-term borrowings (in millions of Korean won and thousands of foreign currencies) December 31, 2022 December 31, 2023 Financial institution Type Annual interest rates Foreign currency Korean won Foreign currency Korean won Export-Import Bank of Korea Inter-Korean Cooperation Fund 1 1.00% —  ￦ 1,974 —  ￦ 1,480 CA-CIB General loans 3.380%~4.150% —  200,000 —  200,000 JPM General loans 2.700%~4.480% —  100,000 —  200,000 DBS General loans 4.079% —  100,000 —  100,000 Shinhan Bank General loans 2 Term SOFR(3M)+1.100% USD 8,910 11,292 USD 8,910 11,489 General loans —  USD 38,000 48,158 —  —  General loans 1.900%~3.200% USD 31,472 39,855 USD 40,655 General loans 3 4.490% —  62,398 —  62,398 General loans 2 Term SOFR(3M)+1.300% USD 21,127 26,774 USD 27,241 General loans 2 Term SOFR(3M)+1.940% —  —  USD 45,129 General loans 2 CD(91D)+1.800% —  —  —  16,900 General loans 2 EURIBOR(3M)+0.900% EUR 7,700 10,404 EUR 7,700 10,985 Woori Bank General loans 3.320%~5.800% —  15,000 —  41,526 PF loans —  —  40,682 —  —  Hi Investment & Securities CP 2.302% —  90,724 —  92,994 Bookook Investment CP 3.490%~3.603% —  18,806 —  19,525 Korea Investment CP 3.622% —  73,039 —  75,928 Korea Development Bank General loans 3.000%~4.870% —  38,000 —  137,000 NH Jayang PF loans 2 CD(91D)+1.150 —  59,066 —  53,033 Kyobo Life Insurance PF loans 2 CD(91D)+1.150%~ CD(91D) +3.450% —  66,390 —  84,586 Standard Chartered Bank Korea PF loans 2 CD(91D)+1.150%~ CD(91D) +3.450% —  44,260 —  56,390 General loans 2 CD(91D)+0.750% —  —  —  32,000 Samsung Life Insurance PF loans 1.860%~4.160% —  36,883 —  46,992 Subtotal 1,083,705 1,356,251 Less: Current portion (167,943 ) (699,800 ) ￦ 915,762 ￦ 656,451 1 The above Inter-Korean Cooperation Fund is repayable in installments over 13 years after a seven-year grace period. 2 EURIBOR (3M), Term SOFR (3M) and CD (91D) are approximately 3.909%, 5.331%, 3.820% respectively, as of December 31, 2023. 3 The general loans are repayable in installments over 4 years after a three-year grace period. (2) Repayment schedule of the Group’s debentures and borrowings including the portion of current liabilities as of December 31, 2023, is as follows: (in millions of Korean won) Bonds Borrowings Total In local In foreign Sub- total In local In foreign Sub- total Jan. 1, 2024 ~ Dec. 31, 2024 ￦ 1,478,000 ￦ 454,941 ￦ 1,932,941 ￦ 1,016,254 ￦ 109,331 ￦ 1,125,585 ￦ 3,058,526 Jan. 1, 2025 ~ Dec. 31, 2025 1,445,000 1,160,460 2,605,460 421,322 56,618 477,940 3,083,400 Jan. 1, 2026 ~ Dec. 31, 2026 760,000 515,760 1,275,760 109,087 —  109,087 1,384,847 Jan. 1, 2027 ~ Dec. 31, 2027 280,000 386,820 666,820 15,600 —  15,600 682,420 After Jan. 1, 2028 1,845,000 128,940 1,973,940 53,825 —  53,825 2,027,765 Total ￦ 5,808,000 ￦ 2,646,921 ￦ 8,454,921 ￦ 1,616,088 ￦ 165,949 ￦ 1,782,037 ￦ 10,236,958

Provisions

Provisions	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
Provisions	16. Provisions Changes in provisions for the years ended December 31, 2022 and 2023, are as follows: 2022 (in millions of Korean won) Litigation Restoration cost Others Total Beginning balance ￦ 80,165 ￦ 107,358 ￦ 69,874 ￦ 257,397 Increase (Transfer) 6,005 13,027 5,847 24,879 Usage (6,155 ) (8,143 ) (15,783 ) (30,081 ) Reversal (43,686 ) (3,685 ) (4,418 ) (51,789 ) Others —  405 (445 ) (40 ) Ending balance ￦ 36,329 ￦ 108,962 ￦ 55,075 ￦ 200,366 Current 34,730 19,918 54,485 109,133 Non-current ￦ 1,599 ￦ 89,044 ￦ 590 ￦ 91,233 2023 (in millions of Korean won) Litigation Restoration cost Others Total Beginning balance ￦ 36,329 ￦ 108,962 ￦ 55,075 ￦ 200,366 Increase (Transfer) 592 26,381 10,656 37,629 Usage (7,179 ) (1,138 ) (6,391 ) (14,708 ) Reversal (35 ) (653 ) (2,096 ) (2,784 ) Scope change —  —  (177 ) (177 ) Others —  (393 ) 2,290 1,897 Ending balance ￦ 29,707 ￦ 133,159 ￦ 59,357 ￦ 222,223 Current ￦ 29,130 ￦ 26,945 ￦ 59,134 ￦ 115,209 Non-current 577 106,214 223 107,014

Net Defined Benefit Liabilities

Net Defined Benefit Liabilities (Assets)	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
Net Defined Benefit Liabilities (Assets)	17. Net Defined Benefit Liabilities (Assets) (1) The amounts recognized in the statements of financial position as of December 31, 2022 and 2023, are determined as follows: (in millions of Korean won) December 31, 2022 December 31, 2023 Present value of defined benefit obligations ￦ 2,218,655 ￦ 2,365,793 Fair value of plan assets (2,478,143 ) (2,462,925 ) Liabilities ￦ 51,654 ￦ 63,616 Assets ￦ 311,142 ￦ 160,748 (2) Changes in the defined benefit obligations for the years ended December 31, 2022 and 2023, are as follows: (in millions of Korean won) 2022 2023 Beginning ￦ 2,494,930 ￦ 2,218,655 Current service cost    238,068     213,489  Interest expense 59,041 103,874 Benefit paid (316,047 ) (358,298 ) Changes due to settlements of plan & Past Service Cost (701 ) 1 Remeasurements: Actuarial gains ( ) (13,048 ) 1,903 Actuarial gains ( ) (323,501 ) 138,462 Actuarial gains arising from experience adjustments 80,845 48,174 Acquisition and disposition of businesses, etc. (932 ) (467 ) Ending ￦ 2,218,655 ￦ 2,365,793 (3) Changes in the fair value of plan assets for the years ended December 31, 2022 and 2023, are as follows: (in millions of Korean won) 2022 2023 Beginning ￦ 2,314,632 ￦ 2,478,143 Interest income 55,902  121,336  Remeasurements: Return on plan assets (excluding amounts included in interest income) (8,542 ) 9,410 Benefits paid (287,419 ) (307,762 ) Employer contributions    401,358    165,128 Acquisition and disposition of businesses, etc. 2,212 (3,330 ) Ending ￦ 2,478,143 ￦ 2,462,925 (4) Amounts recognized in the consolidated statements of profit or loss for the years ended December 31, 2021, 2022 and 2023, are as follows: (in millions of Korean won) 2021 2022 2023 Current service cost ￦ 249,125 ￦ 238,068 ￦ 213,922 Net Interest cost 5,047 3,139 (17,462 ) Changes due to settlements of plan & Past Service Cost (681 ) (701 ) 1 Transfer out (16,660 ) (15,102 ) (13,435 ) Total expenses ￦ 236,831 ￦ 225,404 ￦ 183,026 (5) Principal actuarial assumptions used are as follows: December 31, December 31, December 31, Discount rate 2.1%~3.70% 2.4%~6.29% 3.67%~5.51% Salary growth rate 1%~6.97% 1.82%~8.9% 1.7%~8.96% (6) The sensitivity of the defined benefit obligations as of December 31, 2023, to changes in the principal assumptions is: (In percentage, in millions of Korean won ) Effect on defined benefit obligation Changes in Increase in Decrease in Discount rate 0.5% point ￦ ￦ 150,568 Salary growth rate 0.5% point 145,687  (135,431 ) A decrease in corporate bond yields will increase plan liabilities, although this will be partially offset by an increase in the value of the plans’ bond holdings. The above sensitivity analysis is based on an assumption while holding all other assumptions constant. In practice, this is unlikely to occur, and changes in some of the assumptions may be correlated. The sensitivity of the defined benefit obligation to changes in principal actuarial assumptions is calculated using the projected unit credit method, the same method applied when calculating the defined benefit obligations recognized on the statement of financial position. (7) Effect of defined benefit plan on future cash flows The Group actively monitors how the duration and the expected yield of the investments match the expected cash outflows arising from the pension obligations. Expected contributions to post-employment benefit plans for the year ending December 31, 2023, are ￦ The expected maturity analysis of undiscounted pension benefits as o (in millions of Korean won) Less than 1 year Between 1- Between 2- Over 5 years Total Pension benefits ￦ 257,315 ￦ 376,352 ￦ 910,076 ￦ 2,013,167 ￦ 3,556,910 The weighted average duration of the defined benefit obligations is 6.2 years.

Defined Contribution Plan

Defined Contribution Plan	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
Defined Contribution Plan	18. Defined Contribution Plan Recognized expense related to the defined contribution plan for the year ended December 31, 2023, is ￦ ￦ ￦

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
Commitments and Contingencies	19. Commitments and Contingencies (1) As of December 31, 2023, major commitments with local financial institutions are as follows: (in millions of Korean won and foreign currencies in thousands) Financial institution Limit Used amount Bank overdraft Kookmin Bank and others 374,000 — Inter-Korean Cooperation Fund Export-Import 37,700 1,480 Economic Cooperation Business Insurance Export-Import Bank of Korea 3,240 1,732 Collateralized loan on electronic accounts receivable-trade Kookmin Bank and others 545,350 42,822 Plus electronic notes payable Industrial Bank of Korea 50,000 885 Working capital loan Korea Development Bank and others 1,562,800 142,700 Shinhan Bank USD 76,509 USD 76,509 Woori Bank EUR 7,700 EUR 7,700 Facility loans Shinhan Bank and others 924,000 429,924 Derivatives transaction limit Korea Development Bank and others USD 1,970,000 USD 1,970,000 Citi Bank JPY 400,000 JPY 400,000 Total KRW 3,497,090 619,543 USD 2,046,509 2,046,509 EUR 7,700 7,700 JPY 400,000 400,000 (2) As of December 31, 2023, guarantees received from financial institutions are as follows: (in millions of Korean won and foreign currencies in thousands) Financial institution Limit Hana Bank Guarantee for payment in Korean currency 4,000 Comprehensive credit line and others 3,100 Guarantee for payment in foreign currency USD 59 Comprehensive credit line and others USD 10,300 Kookmin Bank Guarantee for payment in foreign currency USD 3,186 Shinhan Bank Guarantee for payment in Korean currency and others USD 94,517 Guarantee for payment in foreign currency and others VND 211,262 Woori Bank Guarantee for payment in Korean currency 5,200 Guarantee for payment in foreign currency USD 7,000 Korea Development Bank Refund guarantee for advances received USD 6,811 HSBC Guarantees for depositions USD 816 Seoul Guarantee Insurance Company Performance guarantee and others 366,395 Korea Software Financial Cooperative Performance guarantee and others 1,556,979 Korea Specialty Contractor Financial Cooperative Performance guarantee and others 135 Korea Housing Finance Corporation Performance guarantee and others 44,000 (in millions of Korean won and foreign currencies in thousands) Financial institution Limit Korea Housing & Urban Guarantee Corporation 1 Performance guarantee and others 691,530 Information & Communication Financial Cooperative Performance guarantee and others 78,183 Total KRW 2,749,522 USD 122,689 VND 211,262 1 Inventory assets( ￦ 278,031 ￦ 283,688 (3) As of December 31, 2023, guarantees provided by the Group to a third party, are as follows: (in millions of Korean won) Subject to payment Creditor Limit Used Period KT Estate Inc Wonju Bando U-bora Mark Bridge Buyer Hana Bank 103,000 55,314 Aug. 5, 2022 KT Engineering Co., Ltd. 1 Gasan Solar Power Plant Inc. Shinhan Bank 4,700 364 Jan. 7, 2010 KT Engineering Co., Ltd. 1 Korea Cell Inc. Suhyup Bank 3,250 50 Feb. 17, 2014 KT Engineering Co., Ltd. 1 San-Ya Agricultural Association Corporation Suhyup Bank 3,250 51 Feb. 17, 2014 KT Alpha Co., Ltd. Cash payers T-commerce cash payers 821 — Apr. 14, 2023 Nasmedia Co., Ltd. Stockholders Association Members Korea 1,104 610 — 1 KT Engineering Co., Ltd., a subsidiary of the Group, is subject to payment, depending on the reimbursement of principal debtor. (4) The Controlling Company is jointly and severally obligated with KT Sat Co., Ltd., a subsidiary, to pay KT Sat Co., Ltd.’s liabilities incurred prior to spin-off. As of December 31, 2023, the Controlling Company and KT Sat Co., Ltd. are jointly and severally liable for reimbursement of ￦ (5) For the year ended December 31, 2023, the Group entered into agreements with the Securitization Specialty Companies (2023: First 5G 67 th th st th (6) As of December 31, 2023, the Group is a defendant in 177 lawsuits with the total claimed amount of ￦ ￦ ￦ (7) Under the agreement of bond issuance and borrowings, the Group is required to maintain certain financial ratios such as debt-to-equity ratio, use the funds for the designated purpose and report to the creditors periodically. The covenant also contains restriction on provision of additional collateral and disposal of certain assets. (8) As of December 31, 2023, the Group participates in Algerie Sidi Abdela new town development consortium (percentage of ownership: 2.5%) and has joint liability with other consortium participants. (9) As of December 31, 2023, contract amount of property and equipment acquisition agreement made but not yet recognized amounts to ￦ 2 ￦ (10) As of December 31, 2023, there are derivatives generated by the Group granting Drag-Along Right to financial investors participating in paid-in capital increase of K Bank (Note 7). (11) The Group has an agreement with a transferor participated in share transfer agreement of MILLE Co., Ltd. As per the conditions of the agreement, the transferor may exercise Put Option for the ordinary shares it owns (Note 7). (12) The Group entered into an agreement with financial investors of Epsilon Global Communications Pte. If certain conditions are not met in the future as disclosed in the terms and conditions of the agreement, financial investors may exercise Tag-Along Right, Drag-Along Right and the right to sell shares for the convertible preferred shares it owns (Note 7). (13) The Group has an obligation for additional contributions as per agreement to Future Innovation Private Equity Fund No.3 and others. As of December 31, 2023, remaining amount of ￦ (14) The Group has the amount of ￦ ￦ ￦ (15) During the prior period, the Group entered into a stock sale contract with HYUNDAI MOBIS and HYUNDAI MOTOR COMPANY. If a certain period of time has elapsed from the date of the contract and the acquired stocks are to be disposed to a third party, HYUNDAI MOBIS and HYUNDAI MOTOR COMPANY may exercise a preferential purchase right to designate a buyer with priority. (16) During the prior period, the Group entered into an agreement with LS Cable & System Ltd., which participated in the stock acquisition contract of KT Submarine Co., Ltd. (formerly KT Submarine Co., Ltd.). As per the agreement, the Group may exercise a put-option to LS Cable & System Ltd in the future (Note 7). (17) During the period, the Group entered into an agreement with equity investors which participated in the stock acquisition contract of KT cloud Co., Ltd., Under the agreement, in specific occasion, equity investors may exercise a Tag-along or put-option to the Group in the future. (18) The Group has the obligation of paying Minimum Guarantee as utilizing product bundling of Tving Co.,Ltd. and the right to be paid certain proportion of the excess as per agreement.

Leases

Leases	12 Months Ended
	Dec. 31, 2023
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Leases	20. Leases Information of leases in which the Group is a lessee is as follows. Information when the Group is a lessor is described in Note 11. (1) Amounts recognized in the consolidated statements of financial position The consolidated statement of financial position shows the following amounts relating to leases: (in millions of Korean won) December 31, December 31, Right-of-use assets Property and building ￦ 1,081,067 ￦ 1,019,537 Machinery and communication line facilities 50,794 89,150 Others 148,473 196,276 Total ￦ 1,280,334 ￦ 1,304,963 (in millions of Korean won) December 31, December 31, Lease liabilities 1 Current ￦ 315,892 ￦ 307,868 Non-Current 856,146 872,042 Total ￦ 1,172,038 ￦ 1,179,910 1 Included in the line items ‘Other current liabilities and other non-current liabilities’ in the consolidated statements of financial position (Notes 9). For the years ended December 31, 2022 and 2023, Right-of-use assets related to leases increased by ￦ ￦ (2) Amounts recognized in the consolidated statements of profit or loss The consolidated statement of profit or loss relating to leases for the year ended December 31, 2021,2022 and 2023 are as follows: (in millions of Korean won) December 31, December 31, December 31, Depreciation of Right-of-use assets Property and building ￦ 303,984 ￦ 305,120 ￦ 297,571 Machinery and communication line facilities 41,794 31,140 32,794 Others 52,938 59,954 72,372 Total ￦ 398,716 ￦ 396,214 ￦ 402,737 Depreciation of Investment Properties ￦ 1,794 ￦ 15 ￦ —  Interest expense relating to lease liabilities 36,651 41,469 52,035 Expense relating to short-term leases 7,984 12,876 8,804 Expense relating to leases of low-value assets that are not short-term leases 26,033 26,813 26,290 Expense relating to variable lease payments not included in lease liabilities 8,400 4,827 9,288 The total cash outflow for leases for the year ended December 31, 2023 amounts to ￦ ￦ ￦

Share Capital

Share Capital	12 Months Ended
	Dec. 31, 2023
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Share Capital	21. Share Capital As of December 31, 2022 and 2023, the Group has 1,000,000,000 shares authorized to issue and details are as follows: December 31, 2022 December 31, 2023 Number of issued shares Par value per share (Korean won) Ordinary (in millions of Korean won) Number of issued Par value per share (Korean won) Ordinary (in millions of Korean won) Ordinary shares 1 261,111,808 ￦ ￦ 257,860,760 ￦ ￦ 1 The Group retired 55,039,007 treasury shares against retained earnings. Based on the local regulations in Korea, upon retirement of shares, the Company has decreased the shares has decreased capital

Retained Earnings

Retained Earnings	12 Months Ended
	Dec. 31, 2023
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Retained Earnings	22. Retained Earnings Details of retained earnings as at December 31, 2022 and 2023, are as follows: (in millions of Korean won) December 31, December 31, Legal reserve 1 ￦ 782,249 ￦ 782,249 Voluntary reserves 2 4,651,362 4,651,362 Unappropriated retained earnings 8,821,705 9,042,256 Total ￦ 14,255,316 ￦ 14,475,867 1 The Commercial Code of the Republic of Korea requires the Controlling Company to appropriate, as a legal reserve, an amount equal to a minimum of 10% of cash dividends paid until such reserve equals 50% of its issued share capital. The reserve is not available for the payment of cash dividends but may be transferred to share capital with the approval of the Controlling Company’s Board of Directors or used to reduce accumulated deficit, if any, with the ratification of the Controlling Company’s majority shareholders. 2 The reserves of research and development of human resources in other surplus reserves are separately accumulated on disposal of retained earnings on tax filing adjustments when calculating income taxes in accordance with regulations of Tax Reduction and Exemption Control Act of Korea. Reversal of the reserves according to the relevant tax law can be paid out as dividends

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income and Other Components of Equity	12 Months Ended
	Dec. 31, 2023
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Accumulated Other Comprehensive Income and Other Components of Equity	23. Accumulated Other Comprehensive Income and Other Components of Equity (1) As of December 31, 2022 and 2023, the details of the Controlling Company’s accumulated other comprehensive income are as follows: (in millions of Korean won) December 31, December 31, Changes in investments in associates and joint ventures ￦ (11,752 ) ￦ 4,023 Gain (loss) on derivatives valuation (7,109 ) (29,361 ) Gain (loss) on valuation of financial assets at fair value through other comprehensive income (52,100 ) 73,928 Exchange differences on translation for foreign operations (6,815 ) 3,817 Total ￦     (77,776 ) ￦     52,407 (2) Changes in accumulated other comprehensive income for the years ended December 31, 2022 and 2023, are as follows: 2022 ( in millions of Korean won) Beginning Increase/ decrease Reclassification to gain or loss Ending Changes in investments in associates and joint ventures ￦ (3,461 ) ￦ (8,291 ) ￦ —  ￦ (11,752 ) Gain (loss) on derivatives valuation 25,031 63,281 (95,421 ) (7,109 ) Gain on valuation of financial assets at fair value through other comprehensive income 108,685 (160,785 ) —  (52,100 ) Exchange differences on translation for foreign operations (12,786 ) 5,971 —  (6,815 ) Total ￦ 117,469 ￦ (99,824 ) ￦ (95,421 ) ￦ (77,776 ) 2023 (in millions of Korean won) Beginning Increase Reclassification to gain or loss Ending Changes in investments in associates and joint ventures ￦ (11,752 ) ￦ 15,775 ￦ —  ￦ 4,023 Gain (loss) on derivatives valuation (7,109 ) 15,690 (37,942 ) (29,361 ) Gain (loss) on valuation of financial assets at fair value through other comprehensive income (52,100 ) 126,028 —  73,928 Exchange differences on translation for foreign operations (6,815 ) 10,632 —  3,817 Total ￦ (77,776 ) ￦ 168,125 ￦ (37,942 ) ￦ 52,407 (3) The Group’s other components of equity as at December 31, 2022 and 2023, are as follows: (in millions of Korean won) December 31, December 31, Treasury stock ￦ (202,295 ) ￦ (398,075 ) Gain or loss on disposal of treasury stock 1 (41,503 ) 3,220 Share-based payments 6,222 8,773 Equity transactions within consolidated entities 2 (334,576 ) (416,336 ) Total ￦ (572,152 ) ￦ (802,418 ) 1 The amount directly reflected in equity is ￦ ￦ 2 Profit or loss incurred from transactions with non-controlling interest and investment difference incurred from changes in ownership of subsidiaries are included. (4) As of December 31, 2022 and 2023, the details of treasury stock are as follows: December 31, December 31, Number of shares (in shares) 5,069,130 11,447,338 Amounts (in millions of Korean won) ￦ 202,295 ￦ 398,075   Treasury stocks held as of December 31, 2023, are expected to be used for stock compensation for the Group’s directors, employees, and other purposes.

Share-based Payments

Share-based Payments	12 Months Ended
	Dec. 31, 2023
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Share-based Payments	24. Share-based Payments (1) Details of share-based payments granted by the Controlling to executives and employees, including the CEO, by the resolution of the Board of Directors for the years ended December 31, 2022 and 2023, are as follows: 2022 (in share) 16th grant Grant date June 9, 2022 Grantee CEO, internal directors, external directors, executives Vesting conditions Service condition: 1 year Non-market performance condition: achievement of performance Fair value per option (in Korean won) ￦ Total compensation costs (in Korean won) ￦ Exercise date July 17, Valuation method Fair value method 2023 (in share) 17th grant Grant date June 15, 2023, Oct 17, 2023 Grantee CEO, internal directors, external directors, executives Vesting conditions Service condition: 1 year Non-market performance condition: achievement of performance Fair value per option (in Korean won) ￦ Total compensation costs (in Korean won) ￦ Estimated exercise date (exercise date) During 2024 Valuation method Fair value method (2) Changes in the number of stock options and the weighted-average exercise price as at December 31, 2022 and 2023, are as follows: (In share) 2022 Beginning Grant Expired Exercised 1 Ending Number of 15th grant 284,209 —  (155,286 ) (128,923 ) —  —  16th grant —  258,509 —  —  258,509 —  Total 284,209 258,509 (155,286 ) (128,923 ) 258,509 —  (In share) 2023 Beginning Grant Expired Exercised 1 Ending Number of 16th grant 258,509 —  (105,859 ) (131,690 ) 20,960 —  17th grant —  307,182 —  —  307,182 —  Total 258,509 307,182 (105,859 ) (131,690 ) 328,142 —  1 The weighted average price of ordinary shares at the time of exercise, during the year ended December 31, 2023 is ￦ ￦

Revenue from Contracts with Cus

Revenue from Contracts with Customers, Other Income and Relevant Contract Assets and Liabilities	12 Months Ended
	Dec. 31, 2023
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Revenue from Contracts with Customers, Other Income and Relevant Contract Assets and Liabilities	25. Revenue from Contracts with Customers, Other Income and Relevant Contract Assets and Liabilities (1) The Group has recognized the following amounts relating to revenue and other income in the statement of profit or loss: (in millions of Korean won) 2021 2022 2023 Revenue from contracts with customers ￦ 24,712,128 ￦ 25,432,727 ￦ 26,063,185 Revenue from other sources 185,877 206,128 224,016 Other income (Note 26) 307,654 595,351 308,044 Total revenue and other income ￦ 25,205,659 ￦ 26,234,206 ￦ 26,595,245 (2) Operating revenues and other income for the years ended December 31, 2021, 2022 and 2023 are as follows: (in millions of Korean won) 2021 2022 2023 Mobile services ￦ 6,936,485 ￦ 7,013,889 ￦ 7,140,333 Fixed-line services 4,960,338 5,056,513 5,142,359 Fixed-line and VoIP telephone services 1,465,059 1,378,265 1,249,024 Broadband Internet access services 2,343,591 2,504,833 2,578,558 Data communication services 1,151,689 1,173,415 1,314,777 Media and content 2,800,630 3,099,776 3,206,521 Financial services 3,661,896 3,836,589 3,967,763 Sale of goods 3,532,973 3,393,646 3,292,514 Others 3,313,337 3,833,793 3,845,755 Total ￦ 25,205,659 ￦ 26,234,206 ￦ 26,595,245 Mobile and fixed-line service Telecommunication service revenues include mobile and fixed-line (e.g., fixed-line and VoIP telephone, broadband internet access services and data communication services). These services represent a series of distinct services that are considered a separate performance obligation. Service revenue is recognized when services are provided, based upon either usage (e.g., minutes of traffic/bytes of data processed) or period of time (e.g., monthly service fees). Media and content services Revenue from media and content services primarily consists of installation fees and basic monthly charges of IPTV and satellite TV services, as well as revenue from digital content distribution, digital music streaming and downloading. Media and contents services revenue are recognized when services are provided, based upon either usage or period of time. Financial services Financial services primarily include commissions for merchant fees paid by merchants to credit card companies for processing transactions. Revenue from the commission is recognized when the service obligation is performed. Sale of goods Revenue from sale of goods, primarily handsets related to our mobile services is recognized when a performance obligation is satisfied by transferring promised goods to customers. (3) Contract assets and liabilities recognized in relation to the revenues from contracts with customers, are as follows: (in millions of Korean won) December 31, December 31, Contract assets 1 ￦ 963,133 ￦  1,130,745 Contract liabilities 1   344,869 311,023 Deferred revenue 2 ￦ 81,653 ￦ 81,067 1 The Group recognized contract assets of ￦ ￦ ￦ ￦ 2 Deferred revenue recognized relating to government grant is excluded. (4) The contract costs recognized as assets are as follows: (in millions of Korean won) 2021 2022 2023 Incremental cost of contract establishment ￦ 1,726,401 ￦ 1,744,096 ￦ 1,656,711 Cost of Contract performance 74,843 73,582 70,757 As at December 31, 2023, the Group recognized ￦ ￦ ￦ (5) The recognized revenue arising from carried-forward contract liabilities from prior year is as follows: (in millions of Korean won) 2021 2022 2023 Revenue recognized that was included in the contract liabilities balance at the beginning of the year Allocation of the transaction price ￦ 275,965 ￦ 246,843 ￦ 213,609 Deferred revenue of joining/installment fee 42,100 44,204 41,824 Total ￦ 318,065 ￦ 291,047 ￦ 255,433

Other Income

Other Income	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
Other income	26. Other Income Other income for the years ended December 31, 2021, 2022 and 2023, are as follows: (in millions of Korean won) 2021 2022 2023 Gains on disposal of property and equipment and investment properties ￦ 54,007 ￦ 52,603 ￦ 22,447 Gains on disposal of intangible assets 1,726 622 1,727 Gain on disposal of right-of-use assets 3,138 3,326 3,580 Property and Equipment loss recovery income 148,927 159,849 152,712 Income from 43,822 44,473 40,725 Gain on disposal of investments in associates 5 38,319 6,982 Gain on disposal of investments in subsidiaries 244 216,591 28,825 Others 1 55,785 79,568 51,046 Total ￦ 307,654 ￦ 595,351 ￦ 308,044 1 Certain amounts that were previously reported in the table above have been grouped as Others.

Operating Expenses

Operating Expenses	12 Months Ended
	Dec. 31, 2023
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Operating Expenses	27. Operating Expenses (1) Operating expenses for the years ended December 31, 2021, 2022 and 2023, are as follows: (in millions of Korean won) 2021 2022 2023 Employee benefit cost ￦ 4,215,810 ￦ 4,495,885 ￦ 4,556,832 Depreciation 2,605,594 2,637,463 2,723,610 Depreciation of right-of-use assets 398,716 396,214 402,737 Amortization of intangible assets 603,327 622,202 683,784 Commissions 1,125,944 1,295,434 1,264,729 Interconnection charges 507,567 479,500 436,598 International interconnection fee 192,008 186,253 140,433 Purchase of inventories 3,753,792 3,656,040 3,595,345 Changes of inventories 20,491 (195,046 ) (203,071 ) Sales commission 2,343,375 2,353,909 2,353,318 Service cost 1 2,296,324 2,334,386 2,229,709 Utilities 364,373 368,348 544,675 Taxes and dues 268,651 276,962 250,651 Rent 123,246 160,848 167,576 Insurance premium 66,717 68,245 66,737 Installation fee 154,542 150,140 174,238 Advertising expenses 171,400 195,519 153,750 Allowance for bad debts 82,329 115,358 150,549 Card service cost 3,114,047 3,127,673 3,189,376 Loss on disposal of property and equipment 71,417 81,415 72,710 Loss on disposal of intangible assets 3,885 7,015 5,328 Loss on disposal of right-of-use assets 11,457 2,348 2,115 Loss on disposal of investments in subsidiaries 13,727 —  —  Impairment loss on property and equipment 2,115 16,094 7,871 Impairment loss on intangible assets 3,747 30,965 236,206 Donations 10,981 15,642 24,664 Other allowance for bad debts 28,066 17,551 34,112 Others 952,614 1,369,686 1,902,214 Total ￦ 23,506,262 ￦ 24,266,049 ￦ 25,166,796 1 Service cost is mainly recorded by purchase of service for system implementation and contents service. (2) Details of employee benefit cost for the years ended December 31, 2021, 2022 and 2023, are as follows: (in millions of Korean won) 2021 2022 2023 Salaries & Wages ￦  3,837,359 ￦  4,161,874 ￦  4,231,781 Post-employment benefits(Defined benefit plan) 236,831 225,404 183,026 Post-employment benefits(Defined contribution plan) 71,068 72,576 85,174 Share-based payment 47,415 16,799 15,450 Others 23,137 19,232 41,401 Total ￦ 4,215,810 ￦ 4,495,885 ￦ 4,556,832

Financial Income and Costs

Financial Income and Costs	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
Financial Income and Costs	28. Financial Income and Costs (1) Details of financial income for the years ended December 31, 2021, 2022 and 2023, are as follows: (in millions of Korean won) 2021 2022 2023 Interest income ￦ 273,460 ￦ 271,925 ￦ 279,607 Gain on foreign currency transactions 19,976 67,976 27,407 Gain on foreign currency translation 32,768 43,092 11,944 Gain on derivative transactions 2,215 50,668 12,304 Gain on valuation of derivatives 255,149 182,998 49,881 Gain on disposal of trade receivables —  —  3,441 Gain on valuation of financial instruments 90,653 31,032 32,477 Others 52,062 42,737 69,216 Total ￦ 726,283 ￦ 690,428 ￦ 486,277 (2) Details of financial costs for the years ended December 31, 2021, 2022 and 2023, are as follows: (in millions of Korean won) 2021 2022 2023 Interest expenses ￦ 263,389 ￦ 293,854 ￦ 356,345 Loss on foreign currency transactions 13,105 81,171 34,281 Loss on foreign currency translation 213,689 200,109 95,730 Loss on derivative transactions 6,287 24,331 417 Loss on valuation of derivatives 15,947 21,601 6,598 Loss on disposal of trade receivables 22,712 62,697 17,980 Loss on valuation of financial instruments 25,994 65,660 55,049 Others 2,207 485 2,282 Total ￦ 563,330 ￦ 749,908 ￦ 568,682

Deferred Income Tax and income

Deferred Income Tax and income Tax Expense	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
Deferred Income Tax and income Tax Expense	29. Deferred Income Tax and income Tax Expense (1) The analysis of deferred tax assets and deferred tax liabilities as at December 31, 2022 and 2023, is as follows: (in millions of Korean won) December 31, December 31, Deferred tax assets Deferred tax assets to be recovered within 12 months ￦ 398,710 ￦ 404,234 Deferred tax assets to be recovered after more than 12 months 1,907,690 1,824,099 Deferred tax assets before offsetting 2,306,400 2,228,333 Deferred tax liabilities Deferred tax liabilities to be recovered within 12 months (586,522 ) (491,817 ) Deferred tax liabilities to be recovered after more than 12 months (2,108,438 ) (2,116,346 ) Deferred tax liabilities before offsetting (2,694,960 ) (2,608,163 ) Deferred tax assets after offsetting ￦ 579,090 ￦ 614,500 Deferred tax liabilities after offsetting ￦ 967,650 ￦ 994,330 (2) The movement in deferred income tax assets and liabilities during the year, without taking into consideration the offsetting of balances within the same tax jurisdiction, is as follows: (in millions of Korean won) 2022 Beginning Statement of Other Ending Deferred tax liabilities Investments in subsidiaries, associates and joint ventures (240,633 ) (18,299 ) 3,748 (255,184 ) Depreciation and impairment loss (88,588 ) (62,845 ) —  (151,433 ) Plan assets (538,928 ) (5,294 ) 1,322 (542,900 ) Advanced depreciation provision (339,005 ) (182,934 ) —  (521,939 ) Contract assets (493,917 ) 69,615 —  (424,302 ) Financial assets at fair value through profit or loss (336 ) (73 ) (11 ) (420 ) Financial assets at fair value through other comprehensive income (47,521 ) (71,396 ) 58,288 (60,629 ) Others (623,744 ) (111,135 ) (3,274 ) (738,153 ) Total ￦ (2,372,672 ) ￦ (382,361 ) ￦ 60,073 ￦ (2,694,960 ) Deferred tax assets Depreciation and impairment loss 225,821 (36,989 ) —  188,832 Contract liabilities 148,454 (27,165 ) —  121,289 Defined benefit liabilities 571,336 (22,423 ) (67,055 ) 481,858 Provisions 172,871 (20,894 ) (22 ) 151,955 Others 899,543 351,317 8,635 1,259,495 Total ￦ 2,018,025 ￦ 243,846 ￦ (58,442 ) ￦ 2,203,429 Temporary difference, net (354,647 ) (138,515 ) 1,631 (491,531 ) Tax credit carryforwards 134,417 (31,446 ) —  102,971 Total net balance ￦ (220,230 ) ￦ (169,961 ) ￦ 1,631 ￦ (388,560 ) (in millions of Korean won) 2023 Beginning Statement of Other Ending Deferred tax liabilities Investments in subsidiaries, associates and joint ventures (255,184 ) (7,821 ) (7,225 ) (270,230 ) Depreciation and impairment loss (151,433 ) 39,309 —  (112,124 ) Plan assets (542,900 ) 8,367 826 (533,707 ) Advanced depreciation provision (521,939 ) 3,859 —  (518,080 ) Contract assets (424,302 ) 2,478 —  (421,824 ) Financial assets at fair value through profit or loss (420 ) 461 43 84 Financial assets at fair value through other comprehensive income (60,629 ) (53 ) (41,945 ) (102,627 ) Others (738,153 ) 90,876 (2,378 ) (649,655 ) Total ￦ (2,694,960 ) ￦ 137,476 ￦ (50,679 ) ￦ (2,608,163 ) Deferred tax assets Depreciation and impairment loss 188,832 (71,689 ) (397 ) 116,746 Contract liabilities 121,289 (9,311 ) —  111,978 Defined benefit liabilities 481,858 (6,705 ) 40,838 515,991 Provisions 151,955 (5,784 ) —  146,171 Others 1,259,495 (53,459 ) 2,141 1,208,177 Total ￦ 2,203,429 ￦ (146,948 ) ￦ 42,582 ￦ 2,099,063 Temporary difference, net (491,531 ) (9,472 ) (8,097 ) (509,100 ) Tax credit carryforwards 102,971 26,299 —  129,270 Total net balance ￦ (388,560 ) ￦ 16,827 ￦ (8,097 ) ￦ (379,830 ) (3) The tax impacts recognized directly to equity as of December 31, 2021, 2022, and 2023, are as follows: December 31, 2021 December 31, 2022 December 31, 2023 (in millions of Korean won) Before recognition Tax effect After Before recognition Tax effect After Before recognition Tax effect After Gain (loss) on valuation of financial assets at fair value through other comprehensive income ￦ 163,892 ￦ (34,112 ) ￦ 129,780 ￦ (216,862 ) ￦ 58,288 ￦ (158,574 ) ￦ 163,750 ￦ (41,945 ) ￦ 121,805 Gain (loss) on valuation of hedge instruments 6,916 (1,644 ) 5,272 (42,510 ) 11,180 (31,330 ) (30,168 ) 7,555 (22,613 ) Remeasurements of net defined benefit liabilities 74,518 (18,696 ) 55,822 247,162 (65,733 ) 181,429 (179,129 ) 41,664 (137,465 ) Share of gain (loss) of associates and joint ventures, and others (34,909 ) 9,097 (25,812 ) (14,931 ) 3,748 (11,183 ) 28,715 (7,225 ) 21,490 Exchange differences on translation for foreign operations 683 (178 ) 505 23,316 (5,852 ) 17,464 32,376 (8,146 ) 24,230 Gain or loss on disposal of treasury stock (15,657 ) 4,080 (11,577 ) (59,308 ) 14,886 (44,422 ) 402 (101 ) 301 Total ￦ 195,443 ￦ (41,453 ) ￦ 153,990 ￦ (63,133 ) ￦ 16,517 ￦ (46,616 ) ￦ 15,946 ￦ (8,198) ￦ 7,748 (4) Details of income tax expense for the years ended December 31, 2021, 2022 and 2023, are calculated as follows: (in millions of Korean won) 2021 2022 2023 Current income tax expense ￦ 289,471 ￦ 335,796 ￦ 347,265 Impact of change in deferred taxes 229,545 169,961 (16,827 ) Income tax expense ￦ 519,016 ￦ 505,757 ￦ 330,438 (5) The tax on the Group’s profit before tax differs from the theoretical amount that would arise using the weighted average tax rate applicable to profits of the entities as follows: (in millions of Korean won) 2021 2022 2023 Profit before income tax expense ￦ 1,978,411 ￦ 1,891,392 ￦ 1,302,620 Statutory income tax expense ￦ 533,701 ￦ 509,771 ￦ 333,530 Tax effect Income not taxable for taxation purposes (4,307 ) (47,550 ) (30,106 ) Non-deductible expenses 20,570 53,398 26,723 Tax credit (31,517 ) (54,895 ) (78,459 ) Additional payment of income taxes (221 ) 11,744 (4,991 ) Adjustments in deferred tax from changes in tax rate —  (41,545 ) 564 Tax effect and adjustment on consolidation Goodwill impairment —  5,809 106,010 Eliminated dividend income form subsidiaries 7,264 —  —  Changes of out-side tax effect 4,738 29,922 4,436 Intangible Asset impairment and amortization 796 5,276 5,892 Reversal expenses of contract cost assets (2,932 ) (4,800 ) 9,281 Acquisition and disposition of businesses (5,128 ) —  —  Others (3,948 ) 38,627 (42,442 ) Income tax expense ￦ 519,016 ￦ 505,757 ￦ 330,438 (6) Details of deferred tax assets and liabilities that are not recognized as at December 31, 2022 and 2023, are as follows: (in millions of Korean won) 2022 2023 Deductible temporary differences Investment in subsidiaries, associates, and joint ventures ￦ 3,384,295 ￦ 3,520,173 Unused tax loss 103,326 203,200 Unused Tax credit 1,988 2,338 Others 387,084 437,238 Total ￦ 3,876,693 ￦ 4,162,949 Taxable temporary differences Investment in subsidiaries, associates, and joint ventures ￦ 857,076 ￦ 903,394 Others 216,660 211,201 Total ￦ 1,073,736 ￦ 1,114,595 (7) The expected period of expiry for unused tax losses not recognized in deferred tax assets as of December 31, 2022 and 2023, is as follows: (in millions of Korean won) 2022 2023 2023 ￦  72,512 ￦   4,484 2024 5,011 2,836 2025 3,701 2,086 2026 2,112 4,541 2027 2,534 2,473 2028 396 6,533 2029 617 743 2030 2,198 713 2031 1,360 756 2032 7,450 —  Atter 2033 5,435 178,035 Total ￦ 103,326 ￦ 203,200

Earnings per Share

Earnings per Share	12 Months Ended
	Dec. 31, 2023
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Earnings per Share	30. Earnings per Share (1) Basic Earnings per Share Basic earnings per share is calculated by dividing the profit from operations attributable to equity holders of the Group by the weighted average number of ordinary shares outstanding during the period, excluding ordinary shares purchased by the Group and held as treasury stock. Basic earnings per share from operations for the years ended December 31, 2021, 2022 and 2023, is calculated as follows: 2021 2022 2023 Profit attributable to ordinary shares of owners of the Controlling Company (in millions of Korean won) ￦ 1,354,537 ￦ 1,259,686 ￦ 993,325 Weighted average number of ordinary shares outstanding (in number of shares) 235,201,782 242,235,332 249,470,072 Basic earnings per share (in Korean won) ￦ 5,759 ￦ 5,200 ￦ 3,982 Diluted earnings per share from operations is calculated by adjusting the weighted average number of ordinary shares outstanding to assume conversion of all dilutive potential ordinary shares. The Group compensat ion (2) Diluted Earnings per Share Diluted earnings per share from operations is calculated by adjusting the weighted average number of ordinary shares outstanding assuming that all dilutive potential ordinary shares are converted into ordinary shares. The Group has dilutive potential ordinary shares from convertible bonds, convertible preferred stock and other share-based payments: 2021 2022 2023 Profit attributable to ordinary shares of owners of the Controlling Company (in millions of Korean won) ￦ 1,354,537 ￦ 1,259,686 ￦ 993,325 Adjustment to net income attributable to ordinary shares (in millions of Korean won) — (496 ) (827 ) Diluted profit attributable to ordinary shares (in millions of Korean won) 1,354,537 1,259,190 992,498 Number of dilutive potential ordinary shares outstanding (in number of shares) 483,760 91,931 119,263 Weighted average number of ordinary shares outstanding (in number of shares) 235,685,542 242,327,263 249,589,335 Diluted earnings per share (in Korean won) ￦ 5,747 ￦ 5,196 ￦ 3,977 Diluted earnings per share is earnings per outstanding of ordinary shares and dilutive potential ordinary shares. Diluted earnings per share is calculated by dividing adjusted profit for the year by the sum of the number of ordinary shares and dilutive potential ordinary shares. Convertible bonds and convertible preferred stocks without dilutive effects are excluded from the calculation.

Dividend

Dividend	12 Months Ended
	Dec. 31, 2023
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Dividend	31. Dividend The dividends paid by the Parent ￦ ￦ ￦ ￦ ￦ ￦ ￦ ￦

Cash Generated from Operations

Cash Generated from Operations	12 Months Ended
	Dec. 31, 2023
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Cash Generated from Operations	32. Cash Generated from Operations (1) Cash flows from operating activities for the years ended December 31, 2021, 2022 and 2023, are as follows: (in millions of Korean won) 2021 2022 2023 1. Profit for the year ￦ 1,459,395 ￦ 1,385,635 ￦ 972,182 2. Adjustments to reconcile net income Income tax expense 519,016 505,757 335,367 Interest income 1 (300,900 ) (340,794 ) (392,580 ) Interest expense 1 268,847 320,914 410,566 Dividends income 2 (21,525 ) (14,121 ) (59,758 ) Depreciation 2,643,894 2,687,191 2,773,152 Amortization of intangible assets 604,744 627,261 691,909 Depreciation of right-of-use assets 398,716 396,214 402,737 Provision for severance benefits (defined benefits) 253,491 240,506 196,027 Impairment losses on trade receivables 105,344 132,102 175,244 Share of net profit or loss of associates and joint ventures (116,061 ) 16,821 44,323 Loss(gain) on disposal of associates and joint ventures 1 (38,024 ) (6,982 ) Loss(gain) on the disposal of subsidiaries 13,483 (216,591 ) (28,825 ) Loss(gain) on disposal of right-of-use assets 8,319 (978 ) (1,465 ) Impairment losses on assets held for sale 11 —  —  Impairment loss on property and equipment and investment in properties 2,115 16,094 7,871 Loss (gain) 3 17,410 (66,317 ) 511 Loss on disposal of intangible assets 2,159 6,393 3,601 Loss on impairment of intangible assets 3,747 30,674 236,106 Loss on foreign currency translation 180,921 157,017 83,899 G (235,130 ) (205,381 ) (37,249 ) Gain (29,974 ) (2,347 ) (2,225 ) Loss(Gain) on valuation of financial assets at fair value through profit or loss (64,660 ) 44,833 13,920 Loss(gain) on disposal of financial assets at amortized cost 4 (35 ) 3 1 Others 84,625 (49,891 ) 158,820 3. Change in operating assets and liabilities, net of effects from purchase of controlled entity and sale of engineering division Decrease(increase) in trade receivables 327,031 (43,787 ) (124,023 ) Increase in other receivables (328,610 ) (1,598,216 ) (1,085,527 ) Decrease(increase) in other current assets (89,230 ) (101,947 ) 250,569 I (143,087 ) (120,054 ) (86,030 ) Decrease(increase) in inventories 32,798 (179,255 ) (317,531 ) Increase(decrease) in trade payables 289,044 (368,355 ) 121,515 Increase in other payables 207,583 1,103,113 829,220 Increase(decrease) in other current liabilities 107,993 (30,375 ) 414,436 Decrease in other non-current liabilities (14,915 ) (1,015 ) (14,272 ) Decrease in provisions (4,668 ) (22,115 ) (5,083 ) Increase(decrease) in deferred revenue 3,696 (384 ) 905 Decrease(increase) in plan assets (114,631 ) (90,771 ) 115,725 Payment of post-employment benefits (241,350 ) (343,931 ) (329,861 ) 4. Cash generated from operations (1+2+3) ￦ 5,829,607 ￦ 3,835,879 ￦ 5,747,195 1 BC Card CO., Ltd. and other subsidiaries of the Group recognize interest income and expense as operating revenue and expense, respectively, including interest income of ￦ ￦ ￦ ￦ ￦ ￦ 2 BC Card Co., Ltd. Recognized dividend income as operating revenue, including dividend income of ￦ ￦ ￦ 3 KT Estate Inc. recognized gain and loss on disposal of investment properties as operating revenue and expense, respectively, including gain on disposal of investment properties of ￦ 4 KT Investment CO., Ltd. and other subsidiaries of the Group recognized gain and loss on valuation of financial assets at fair value through profit or loss as operating revenue and expense, respectively, including loss on valuation of financial assets at fair value through profit or loss of ￦ (2) Significant transactions not affecting cash flows for the years ended December 31, 2021, 2022 and 2023, are as follows: (in millions of Korean won) 2021 2022 2023 Reclassification of the current portion of borrowings ￦ 1,303,543 ￦ 1,004,818 ￦ 1,731,998 Reclassification of construction-in-progress to property and equipment 2,916,888 3,167,965 3,123,611 Reclassification of accounts payable from property and equipment (149,512 ) (7,055 ) (293,448 ) Reclassification of accounts payable from intangible assets 524,040 (197,389 ) (276,491 ) Reclassification of payable from defined benefit liabilities 69,415 (32,417 ) 26,246 Reclassification of payable from plan assets (60,320 ) 28,532 (24,821 ) Disposal of treasury stock related to acquisition of financial assets —  747,161 —  Acquisition of financial assets related to disposal of a subsidiary —  250,000 —

Changes in Liabilities Arising

Changes in Liabilities Arising from Financing Activities	12 Months Ended
	Dec. 31, 2023
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Changes in Liabilities Arising from Financing Activities	33. Changes in Liabilities Arising from Financing Activities Details of changes in liabilities arising from financing activities, liabilities related to cashflow to be classified as future financing activities, for the years ended December 31, 2021, 2022 and 2023, are as follows: (in millions of Korean won) 2021 Beginning Cash flows Non-cash Ending Newly Changes in Fair Value Acquisition Others Borrowing ￦ 7,316,298 ￦ 900,394 ￦ 52,782 ￦ 196,890 ￦ —  ￦ 15,994 ￦ (44,655) ￦ 8,437,703 Lease liabilities 1,143,640 (394,567 ) 403,451 3 90 36,840 (30,088) 1,159,369 Derivative liabilities 130,573 (1,712 ) 2,637 (4,311) (4,892) —  (47,119) 75,176 Derivative assets (7,606 ) 216 —  (189,700) (17,251) —  114,888 (99,453 ) Total ￦ 8,582,905 ￦ 504,331 ￦ 458,870 ￦ 2,882 ￦ (22,053) ￦ 52,834 ￦ (6,974 ) ￦ 9,572,795 (in millions of Korean won) 2022 Beginning Cash flows Non-cash Ending Newly Changes in Fair Value Acquisition Others Borrowing ￦ 8,437,703 ￦ 1,391,321 ￦ —  ￦ 146,108 ￦ 939 ￦ —  ￦ 30,614 ￦ 10,006,685 Lease liabilities 1,159,369 (378,684 ) 427,398 —  —  —  (36,045) 1,172,038 Derivative liabilities 75,176 (41,197 ) —  19,858 12,941 —  (33,223) 33,555 Derivative assets (99,453 ) 76,280 (754 ) (147,161) 30,341 —  (50,083) (190,830 ) Total ￦ 9,572,795 ￦ 1,047,720 ￦ 426,644 ￦ 18,805 ￦ 44,221 ￦ — ￦ (88,737) ￦ 11,021,448 (in millions of Korean won) 2023 Beginning Cash flows Non-cash Ending Newly Changes in Fair value Acquisition Others Borrowing ￦ 10,006,685 ￦ 106,118 ￦ —  ￦ 45,370 ￦ 1,719 ￦ —  ￦ 58,273 ￦ 10,218,165 Lease liabilities 1,172,038 (407,051 ) 460,617 —  24 —  (45,719) 1,179,909 Derivative liabilities 33,555 —  —  10,888 9,643 —  (29,539) 24,547 Derivative assets (190,830 ) 48,183 —  32,487 1,788 —  (50,839 ) (159,211 ) Total ￦ 11,021,448 ￦ (252,750) ￦ 460,617 ￦ 88,745 ￦ 13,174 ￦ — ￦ (67,824) ￦ 11,263,410

Segment Information

Segment Information	12 Months Ended
	Dec. 31, 2023
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Segment Information	34. Segment Information (1) The management of the Group determines the operating and reporting segments based on the reported information when establishing the business strategy. Details Business service ICT Mobile/fixed line telecommunication service and convergence business, B2B business and others Finance Credit card business Satellite TV Real estate Satellite TV business Residential building development and supply Others Cable television service, IT, facility security and global business, and others (2) Details of each segment for the years ended December 31, 2021, 2022 and 2023, are as follows: 2021 (in millions of Korean won) Operating revenues Operating Income Depreciation 1 ICT ￦ 18,734,342 ￦ 1,170,920 ￦ 3,217,643 Finance 3,526,743 104,511 46,223 Satellite TV 665,081 61,398 60,980 Real estate 336,218 27,498 60,459 Others 6,474,858 390,903 327,202 Total 29,737,242 1,755,230 3,712,507 Elimination 2 (4,531,583 ) (55,833 ) (104,869 ) Consolidated amount ￦ 25,205,659 ￦ 1,699,397 ￦ 3,607,638 2022 (in millions of Korean won) Operating revenues Operating Income Depreciation and Amortization 1 ICT ￦ 18,697,269 ￦ 1,347,405 ￦ 3,105,807 Finance 3,615,307 119,805 47,638 Satellite TV 709,160 19,797 58,413 Real estate 474,954 113,134 65,457 Others 7,960,143 473,276 575,035 T otal 31,456,833 2,073,417 3,852,350 Elimination 2 (5,222,627 ) (105,260 ) (196,471 ) Consolidated amount ￦ 26,234,206 ￦ 1,968,157 ￦ 3,655,879 2023 (in millions of Korean won) Operating revenues Operating Income Depreciation and Amortization 1 ICT ￦ 18,698,964 ￦ 1,193,333 ￦ 3,183,408 Finance 3,723,286 91,591 37,150 Satellite TV 714,574 (70,170 ) 52,871 Real estate 499,997 73,496 70,653 Others 8,145,272 97,568 584,738 Total 31,782,093 1,385,818 3,928,820 Elimination 2 (5,186,848 ) 42,631 (118,689 ) Consolidated amount ￦ 26,595,245 ￦ 1,428,449 ￦ 3,810,131 1 Sum of the amortization of tangible assets, intangible assets, investment properties, and right-of-use assets. 2 Elimination for operating revenues is the difference between operating revenue included in the CODM report, which is based on Korean IFRS and operating revenue based on IFRS. Elimination for depreciation and amortization and operating revenues also included consolidated adjustments due to intercompany transactions with the group. (3) Operating revenues for the years ended December 31, 2021, 2022 and 2023 and non-current assets as at December 31, 2022 and 2023 by geographical regions, are as follows: (In millions of Korean won) Operating revenues Non-current assets 1 Location 2021 2022 2023 2022.12.31 2023.12.31 Domestic ￦ 25,114,719 ￦ 26,074,349 ￦ 26,425,735 ￦ 20,845,214 ￦ 20,725,694 Overseas 90,940 159,857 169,510 270,490 183,344 Total ￦ 25,205,659 ￦ 26,234,206 ￦ 26,595,245 ￦ 21,115,704 ￦ 20,909,038 1 Sum of property and equipment, intangible assets, investment properties and right-of-use assets.

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2023
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Related Party Transactions	35. Related Party Transactions (1) The list of related party of the Group as of December 31, 2023, is as follows: Relationship Name of Entity Associates and joint ventures There are 54 Associates and joint ventures, and entities listed on the table below has Related Party Transactions Others 1 Goody Studio Co., Ltd., Rebellion Inc., Digital Pharm Co., Ltd., Mastern No.127 Logispoint Daegu Co., Ltd., KORAMKO No. 143 General Private Real Estate Investment Company 1 The investment in preferred shares in these entities are accounted for under IFRS 9. Given the Company’s significant influence in the investees, those are included in the list of related parties. (2) Outstanding balances of receivables and payables in relations to transactions with related parties as of December 31, 2022 and 2023, are as follows: December 31, 2022 Receivables Payables (in millions of Korean won) Trade Other Trade Other Lease Associates and joint ventures K Bank, Inc. ￦ 682 ￦ 258,999 ￦ —  ￦ 299 ￦ —  Little Big Pictures 1,454 7,645 —  9 —  K-Realty 11th Real Estate Investment Trust Company 151 1,283 —  —  8,824 Others 2,285 2 3,235 2,932 —  Total ￦ 4,572 ￦ 267,929 ￦ 3,235 ￦ 3,240 ￦ 8,824 December 31, 2023 Receivables Payables (in millions of Korean won) Trade Other Lease receivables Trade Other Lease liabilities Associates and joint ventures K Bank, Inc. ￦ 862 ￦ 326,006 ￦ 769 ￦ —  ￦ 299 ￦ —  Little Big Pictures 232 3,473 —  9 6 —  K-Realty 11th Real Estate Investment Trust Company 110 1,283 —  —  —  6,732 K-Realty No.3 Real Estate General Private Placement Investment Company 4,576 —  —  —  —  —  Others 2,044 162 —  2,900 3,029 —  Total ￦ 7,824 ￦ 330,924 ￦ 769 ￦ 2,909 ￦ 3,334 ￦ 6,732 (3) Significant transactions with related parties for the years ended December 31, 2021, 2022 and 2023, are as follows: 2021 (in millions of Korean won) Sales Purchases 1 Associates and joint ventures K- Realty CR-REITs No.1 ￦ 238,847 ￦ 1,308 IGIS Professional Investors Private Investment Real Estate Investment LLC No. 395 5,000 —  K Bank, Inc. 24,247 15,164 Others 2,3 28,092 21,302 Total 296,186 37,774 2021 (in millions of Korean won) Interest Interest Dividend Associates and joint ventures K- Realty CR-REITs No.1 ￦ ￦ ￦ Korea Information & Technology Investment Fund (KIF Investment Fund) 223 —  —  K Bank, Inc. —  —  —  Others 2,3 —  —  8,637 Total ￦ 223 ￦ 205 ￦ 48,779 1 Amounts include acquisition of property and equipment, and others. 2 Transaction amount before OSKENT Co., Ltd., Mission Culture Industry Limited, Sweet and Sour Culture Industry Limited, Alma Mater Culture Industry Limited, and KT Philippines are excluded from associates and joint ventures. 3 Includes transactions of Oscar Ent. before it was excluded as associates and joint ventures of the Group. 2022 (in millions of Korean won) Operating Purchases 1 Associates and joint ventures K- Realty CR-REITs No.1 2 ￦ —  ￦ —  K Bank, Inc. 29,536 11,007 Hyundai Robotics Co., Ltd. 1 94 3,799 K-Realty 11th Real Estate Investment Trust Company 330 1,674 Others 3 11,964 37,742 Others Digital Pharm Co., Ltd. 1 —  Total 41,925 54,222 2022 (in millions of Korean won) Acquisition of Interest Interest Dividend Associates and joint ventures K- Realty CR-REITs No.1 2 ￦ —  ￦ —  ￦ —  ￦ 45,549 K Bank, Inc. —  3,052 —  —  Hyundai Robotics Co., Ltd. 1 —  —  —  —  K-Realty 11th Real Estate Investment Trust Company 1,966 —  260 162 Others 3 —  —  —  9,158 Total ￦ 1,966 ￦ 3,052 ￦ 260 ￦ 54,869 1 Amounts include acquisition of property and equipment, and others. 2 Includes transactions of the entity before it was excluded as an associate and joint venture of the Group. 3 Includes transactions of StorySoop Inc. before it was excluded as associates and joint ventures of the Group. 2023 (in millions of Korean won) Operating Purchases 1 Associates and joint ventures K Bank, Inc. ￦ 22,701 ￦ 13,429 HD Hyundai Robotics Co., Ltd. (formerly Hyundai Robotics Co., Ltd.) 78 182 K-Realty 11th Real Estate Investment Trust Company 346 2,559 K-Realty No.3 Real Estate General Private Placement Investment Company 6,216 —  Others 2 3 21,308 42,169 Others Digital Pharm Co., Ltd. 1 —  Total 50,650 58,339 2023 (in millions of Korean won) Acquisition of Interest Interest Dividend Associates and joint ventures K Bank, Inc. ￦ —  ￦ 8,264 ￦ —  ￦ —  HD Hyundai Robotics Co., Ltd.(formerly Hyundai Robotics Co., Ltd.) —  —  —  —  K-Realty 11th Real Estate Investment Trust Company 7 —  261 507 Others 2 3 —  —  —  1,279 Total ￦ 7 ￦ 8,264 ￦ 261 ￦ 1,786 1 Amounts include acquisition of property and equipment, and others. 2 Includes transactions of KD Living Co., Ltd. before it was included as a subsidiary. 3 Includes transactions of FUNDA Co., Ltd, Maruee Limited Company Specializing in the Cultural Industry, Mastern No.127 Logispoint Daegu Co., Ltd. before it was excluded as associates and joint ventures of the Group. (4) Key management compensation for the years ended December 31, 2021, 2022 and 2023, consists of: (in millions of Korean won) 2021 2022 2023 Salaries and other short-term benefits ￦ 2,189 ￦ 1,855 ￦ 1,494 Post-employment benefits 412 294 153 Share-based compensation 669 976 569 Total ￦ 3,270 ￦ 3,125 ￦ 2,216 (5) Fund transactions with related parties for the years ended December 31, 2021, 2022 and 2023, are as follows: 2021 (in millions of Korean won) Borrowing transactions 1 Equity contributions Associates and joint ventures Borrowings Repayments K- REALTY CR REIT 1 ￦ —  ￦ 15,964 ￦ —  K Bank, Inc. —  —  424,957 Pacific Professional Investors Private Investment Real Estate Investment LLC No. 55 —  —  11,000 KT Young Entrepreneurs DNA Investment Fund —  —  8,400 Mastern KT Multi-Family Real Estate Private Equity Investment Fund 1 —  —  6,055 KT-IBKC Future Investment Fund 1 —  —  (5,700 ) Others 2 —  —  18,176 Total ￦ —  ￦ 15,964 ￦ 462,888 1 Borrowing transactions include lease transactions. 2 Others include transactions before exclusion as associates and joint ventures of the Group. 2022 (in millions of Korean won) Borrowing transactions 1 Equity Associates and joint ventures Borrowings Repayments Megazone Cloud Corporation ￦ 30,000 ￦ —  ￦ 130,001 IBK-KT Emerging Digital Industry Investment Fund —  —  10,800 Mastern KT Multi-Family Real Estate Private Equity Investment Fund 1 —  —  18,859 IGIS No. 468-1 General Private Real Estate Investment Company —  —  25,000 K-Realty 11th Real Estate Investment Trust Company 1,916 771 —  Others —  —  93,478 Total ￦ 31,916 ￦ 771 ￦ 278,138 1 Lease transactions are included in borrowing transactions. 2023 (in millions of Korean won) Borrowing transactions 1 Equity Associates and joint ventures Borrowings Repayments K-Realty 11th Real Estate Investment Trust Company ￦ —  ￦ 1,037 ￦ —  STIC Place General Private Placement Real Estate Investment Trust No.2 —  —  20,000 Telco Credit Bureau Co.,Ltd. —  —  6,500 Pacific geumto no.75 private hybrid asset fund —  —  19,000 Kiamco Data Center Blind Fund —  —  15,000 STIC Mixed Asset Investment Trust No.1 —  —  10,930 Others 2 —  —  31,107 Others Rebellions Co.,Ltd. —  —  19,998 Total ￦ —  ￦ 1,037 ￦ 122,535 1 Lease transactions are included in borrowing transactions. 2 Includes transaction details before Daemuga Limited Company Specializing in the Cultural Industry, Maruee Limited Company Specializing in the Cultural Industry were excluded from the associates company. (6) Provision of collateral and investment agreement and others Provision of collateral and investment agreement The Group has an obligation to invest in Kiamco Data Center Blind Fund, a related party, and others according to the agreement. As of December 31, 2023 the Company is planning make an additional investment of ￦ (7) As of December 31, 2023, the limit of the credit card contract provided by the Group to K Bank, Inc. is ￦ ￦

Financial Risk Management

Financial Risk Management	12 Months Ended
	Dec. 31, 2023
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Financial Risk Management	36. Financial Risk Management (1) Financial Risk Factors The Group’s activities expose it to a variety of financial risks: market risk, credit risk and liquidity risk. The Group’s overall risk management program focuses on the unpredictability of financial markets and seeks to minimize potential adverse effects on the Group’s financial performance. The Group uses derivative financial instruments to hedge certain risk exposures such as cash flow risk. The Group’s financial policy is set up in the long-term perspective and annually reported to the Board of Directors. The financial risk management is carried out by the Value Management Office, which identifies, evaluates and hedges financial risks. The treasury department in the Value Management Office considers various finance market conditions to estimate the effect from the market changes. 1) Market risk The Group’s market risk management focuses on controlling the extent of exposure to the risk in order to minimize revenue volatility. Market risk is a risk that decreases value or profit of the Group’s portfolio due to changes in market interest rate, foreign exchange rate and other factors. (i) Sensitivity analysis Sensitivity analysis is performed for each type of market risk to which the Group is exposed. Reasonably possible changes in the relevant risk variable such as prevailing market interest rates, currency rates, equity prices or commodity prices are estimated and if the rate of change in the underlying risk variable is stable, the Group does not alter the chosen reasonably possible change in the risk variable. The reasonably possible change does not include remote or ‘worst case’ scenarios or ‘stress tests’. (ii) Foreign exchange risk The Group is exposed to foreign exchange risk arising from operating, investing and financing activities. Foreign exchange risk is managed within the range of the possible effect on the Group’s cash flows. Foreign exchange risk (i.e. foreign currency translation of overseas operating assets and liabilities) unaffecting the Group’s cash flows is not hedged but can be hedged at a particular situation. As o (in millions of Korean won) Fluctuation of Impact on profit 1 Impact on equity 2021.12.31 10 % ￦ (3,433 ) ￦ 8,692 -10 % 3,433 (8,692 ) 2022.12.31 10 % ￦ (5,841 ) ￦ (15,836 ) -10 % 5,841 15,836 2023.12.31 10 % ￦ (10,313 ) ￦ (18,460 ) -10 % 10,313 18,460 1 Computed with considering derivatives hedging effect applied by the Group to hedge foreign exchange risk of liabilities in foreign currencies. The above analysis is a simple sensitivity analysis which assumes that all the variables other than foreign exchange rates are held constant. Therefore, the analysis does not reflect any correlation between foreign exchange rates and other variables, nor the management’s decision to decrease the risk. Details of financial assets and liabilities in foreign currencies as at December 31, 2021, 2022 and 2023, are as follows: (In thousands of foreign currencies) 2021 2022 2023 Financial Financial Financial Financial Financial Financial USD 245,759 2,302,642 106,426 2,336,607 139,807 2,271,673 SDR 1 255 722 255 722 254 722 JPY 29,227 30,000,763 32,801 400,002 17,496 400,002 GBP —  1,005 30 83 —  —  EUR 3,943 10,801 185 7,832 304 7,810 RWF 2 586 —  15,521 13,025 402 —  THB 3 2,160 —  265 —  244 —  TZS 4 1,644 —  1,464 —  21,958 —  BWP 5 93 —  183 —  680 —  HKD 6 —  105 37 —  —  —  VND 7 257,895 —  280,226 —  380,629 —  SGD 8 13 284,000 448 284,000 1,375 —  TWD 9 —  226 —  —  1,685 —  CHF 10 —  161 —  —  —  25 MYR 11 —  —  1 —  —  —  BGN 12 —  —  62 —  —  —  PKR 13 —  —  —  —  114,025 —  1 Special Drawing Rights. 2 Rwanda Franc. 3 Thailand Bhat. 4 Tanzanian Shilling. 5 Botswana Pula. 6 Hong Kong Dollar. 7 Vietnam Dong. 8 Singapore Dollar. 9 Taiwan Dollar. 10 Swiss Franc. 11 Ringgit Malaysia. 12 Bulgarian Lev. 13 Pakistani rupee (iii) Price risk As of December 31, 2021, 2022 and 2023, the Group is exposed to equity securities price risk because the securities held by the Group are traded in active markets. If the market prices had increased/decreased by 10% with all other variables held constant, the effects on profit before income tax and equity would have been as follows: (in millions of Korean won) Fluctuation of price Impact on profit Impact on equity 2021.12.31 10% ￦ 2,000 ￦ 4,588 - 10 (2,000 ) (4,588 ) 2022.12.31 10% ￦ 2,660 ￦ 113,948 -10% (2,660 ) (113,948 ) 2023.12.31 10% ￦ 1,473 ￦ 121,423 -10% (1,473 ) (121,423 ) The analysis above is based on the assumption that the equity index had increased/decreased by 10% with all other variables held constant and all the Group’s marketable equity instruments had moved according to the historical correlation with the index. Gain or loss on equity securities classified as financial assets at fair value through profit or loss and financial assets at fair value through other comprehensive income can increase or decrease equity. (iv) Cash flow and fair value interest rate risk The Group’s interest rate risk arises from liabilities in foreign currency such as foreign currency debentures. Debentures in foreign currency issued at variable rates expose the Group to cash flow interest rate risk which is partially offset by swap transactions. Debentures and borrowings issued at fixed rates expose the Group to fair value interest rate risk. The Group sets the policy and operates to minimize the uncertainty of the changes in interest rates and financial costs. As o (in millions of Korean won) Fluctuation of interest rate Impact on profit Impact on equity 2021.12.31 + 100 bp ￦ 753 ￦ 5,549 - 100 bp (731 ) (5,675 ) 2022.12.31 + 100 bp ￦ 635 ￦ (2,045 ) - 100 bp (669 ) 2,100 2023.12.31 + 100 bp ￦ (2,693 ) ￦ (4,718 ) - 100 bp 2,696 5,037 The above analysis is a simple sensitivity analysis which assumes that all the variables other than market interest rates are held constant. Therefore, the analysis does not reflect any correlation between market interest rates and other variables, nor the management’s decision to decrease the risk. 2) Credit risk Credit risk is the risk of financial loss to the Group if a customer or counterparty to a financial instrument fails to meet its contractual obligations and arises principally from the Group’s trade receivables from customers, debt securities and others. - Risk management Credit risk is managed on the Group basis with the purpose of minimizing financial loss. Credit risk arises from the normal transactions and investing activities, where clients or other party fails to discharge an obligation on contract conditions. To manage credit risk, the Group considers the counterparty’s credit based on the counterparty’s financial conditions, default history and other important factors. Credit risk arises from cash and cash equivalents, derivative financial instruments and deposits with banks and financial institutions, as well as outstanding receivables. To minimize such risk, only the financial institutions with strong credit ratings are accepted. The Group’s investments in debt instruments are considered to be low risk investments. The credit ratings of the investments are monitored for credit deterioration. - Security For some trade receivables, the Group may obtain security in the form of guarantees or letters of credit, etc. which can be called upon if the counterparty is in default under the terms of the agreement. - Impairment of financial assets The Group has four types of financial assets that are subject to the expected credit loss model: • trade receivables for sales of goods and provision of services, • contract assets relating to provision of services, • debt investments carried at fair value through other comprehensive income, and • other financial assets carried at amortized cost. While cash equivalents are also subject to the impairment requirement, the identified expected credit loss was immaterial. The maximum exposure to credit risk of the Group’s financial instruments without considering value of collaterals as o (in millions of Korean won) December 31, 2022 December 31, 2023 Cash and cash equivalents (except for cash on hand) ￦ 2,437,629 ￦ 2,869,285 Trade and other receivables Financial assets at amortized costs 7,459,994 8,458,259 Financial assets at fair value through other comprehensive income 129,124 116,198 Contract assets 802,253 832,520 Other financial assets Derivatives financial assets for hedging 190,830 159,211 Financial assets at fair value through profit or loss 942,274 880,549 Financial assets at fair value through other comprehensive income 5,432 5,913 Financial assets at amortized costs 1,060,058 1,385,921 Total ￦ 13,027,594 ￦ 14,707,856 The Group is exposed to credit risk for financial guarantee contracts. As of December 31, 2023, the Group’s maximum exposure amount is ￦ ￦ (i) Trade receivables and contract assets The Group applies the simplified approach to measuring expected credit losses which uses a lifetime expected loss allowance for all trade receivables and contract assets. The Group measures the expected credit loss by considering the future unrecoverable rate of the remaining balance of trade receivables and other receivables at the end of the reporting period. Each trade receivables and other receivables are classified considering the credit risk characteristics and overdue periods in order to measure expected credit loss. The expected credit loss rate calculation is based on historical payment and credit loss information in relation to revenue for 36 months period up to December 31, 2023. Meanwhile, the credit sales assets of BC Card Co., Ltd., a subsidiary, were judged to have low credit risk, so the expected 12-month credit loss was applied. The expected credit losses reflect forward-looking information. Provision for impairment as of December 31, 2022 and 2023, are as follows: December 31, 2022 (in millions of Korean won) Less than 6 months 7-12 months More than 1 years Total Expected credit loss rate 5.57 % 25.84 % 67.16 % —  Total carrying amounts ￦ 3,443,163 ￦ 49,491 ￦ 207,396 ￦ 3,700,050 Provision for impairment ￦ (191,668 ) ￦ (12,789 ) ￦ (139,281 ) ￦ (343,738 ) December 31, 2023 (in millions of Korean won) Less than 6 months 7-12 More than 1 years Total Expected credit loss rate 5.43 % 21.72 % 54.55 % —  Total carrying amounts ￦ 3,466,588 ￦ 68,772 ￦ 235,129 ￦ 3,770,489 Provision for impairment ￦ (188,086 ) ￦ (14,940 ) ￦ (128,264 ) ￦ (331,290 ) Details of changes in provisions for impairment of trade receivables the years ended December 31, 2022 and 2023, are as follows: (in millions of Korean won)  2022   2023  Beginning balance ￦ 349,725 ￦ 343,738 Provision 64,522 69,972 Written-off (68,298 ) (80,126 ) Others (2,211 ) (2,294 ) Ending balance ￦ 343,738 ￦ 331,290 As of December 31, 2023, the maximum exposure of the trade receivables carrying amount to credit risk is ￦ ￦ Impairment of trade receivable for the years ended December 31, 2022 and 2023, are as follows: (in millions of Korean won)  2022   2023  Impairment loss Bad debt expenses ￦ 64,522 ￦ 69,972 (ii) Cash equivalents (except for cash on hand) The Group is also exposed to credit risk in relation cash equivalents. The maximum exposure at the end of the reporting period is the carrying amount of these investments. (iii) Other financial assets at amortized costs Other financial assets at amortized cost include time deposits, other long-term financial instruments and others. All of the financial assets at amortized costs are considered to have low credit risk, and the loss allowance recognized during the period was, therefore, limited to 12 months expected losses. Management considers ‘low credit risk’ for other instruments when they have a low risk of default and the issuer has a strong capacity to meet its contractual cash flow obligations in the near term. Details of changes in provisions for impairment of other financial assets at amortized costs for the years ended December 31, 2022 and 2023, are as follows: (in millions of Korean won)  2022   2023  Beginning balance ￦ 201,387 ￦ 218,543 Provision 65,941 114,501 Written-off (51,383 ) (150,014 ) Reversal (850 ) (14,941 ) Others 3,448 15,547 Ending balance ￦ 218,543 ￦ 183,636 (iv) Financial assets at fair value through other comprehensive income All of the debt investments at fair value through other comprehensive income are considered to have low credit risk, and the loss allowance recognized during the period was, therefore, limited to 12 months expected losses. Managements consider ‘low credit risk’ for other instruments when they have a low risk of default and the issuer has a strong capacity to meet its contractual cash flow obligations in the near term. The maximum exposure at the end of the reporting period is the carrying amount of these investments. (v) Financial assets at fair value through profit or loss The Group is also exposed to credit risk in relation to financial assets that are measured at fair value through profit or loss. The maximum exposure at the end of the reporting period is the carrying amount of these investments. 3) Liquidity risk The Group manages its liquidity risk by liquidity strategy and plans. The Group considers the maturity of financial assets and financial liabilities and the estimated cash flows from operations. The table below analyzes the Group’s liabilities (including interest expenses) into relevant maturity groups based on the remaining period at the date of the end of each reporting period to the contractual maturity date. These amounts are contractual undiscounted cash flows and can differ from the amount in the consolidated financial statements. December 31, 2022 (in millions of Korean won) Less than 1 year 1-5 years More than 5 years Total Trade and other payables ￦ 7,386,703 ￦ 1,009,559 ￦ 86,848 ￦ 8,483,110 Borrowings (including debentures) 2,028,207 6,972,077 2,016,472 11,016,756 Lease liabilities 313,162 615,766 407,833 1,336,761 Other non-derivative financial liabilities 33,279 209,155 93,744 336,178 Financial guarantee contracts 1 21,618 —  4,588 26,206 Total ￦ 9,782,969 ￦ 8,806,557 ￦ 2,609,485 ￦ 21,199,011 1 It is total amount guaranteed by the Group according to guarantee contracts. Cash flow from financial guarantee contracts is classified as the maturity group in the earliest period when the financial guarantee contracts can be executed. December 31, 2023 (in millions of Korean won) Less than 1 year 1-5 years More than 5 years Total Trade and other payables ￦ 8,184,036 ￦ 730,340 ￦ 8,040 ￦ 8,922,416 Borrowings (including debentures) 2,922,557 6,027,323 1,743,842 10,693,722 Lease liabilities 313,431 617,561 409,174 1,340,166 Other non-derivative financial liabilities 372,743 747,221 10,073 1,130,037 Financial guarantee contracts 1 13,719 103,000 —  116,719 Total ￦ 11,806,486 ￦ 8,225,445 ￦ 2,171,129 ￦ 22,203,060 1 It is total amount guaranteed by the Group according to guarantee contracts. Cash flow from financial guarantee contracts is classified as the maturity group in the earliest period when the financial guarantee contracts can be executed. At the end of the reporting period, the cash outflows and inflows by maturity of the Group’s derivatives held for trading and gross-settled derivatives are as follows: December 31, 2021 (in millions of Korean won) Less than 1 year 1-5 years More than Total Derivatives held for trading 1 Outflows ￦ —  ￦ 158,284 ￦ —  ￦ 158,284 Derivatives settled gross 2 Outflows ￦ 843,489 ￦ 1,857,942 ￦ 377,302 ￦ 3,078,733 Inflows 856,508 1,917,236 394,134 3,167,878 December 31, 2022 (in millions of Korean won) Less than 1 year 1-5 years More than Total Derivatives held for trading 1 Outflows ￦ —  ￦ 101,994 ￦ 930 ￦ 102,924 Derivatives settled gross 2 Outflows ￦ 472,005 ￦ 2,493,858 ￦  28,786 ￦ 2,994,649 Inflows 550,478 2,670,002 37,873 3,258,353 December 31, 2023 (in millions of Korean won) Less than 1 year 1-5 years More than Total Derivatives held for trading 1 Outflows ￦ —  ￦ 133,293 ￦ —  ￦ 133,293 Inflows —  —  1,015 1,015 Derivatives settled gross 2 Outflows ￦ 741,140 ￦ 1,227,166 ￦   8,126 ￦ 1,976,432 Inflows 614,066 2,198,958 36,344 2,849,368 1 During the year ended December 31, 2023, derivative liabilities held-for-trading are classified under the ‘more than one year to less than five years’ category as they are relevant to the fair value of derivatives liabilities related to shareholder-to-share contracts (Note 19). As these derivatives held-for-trading are managed based on net fair value, their contractual maturities are not necessarily taking into consideration to understand the timing of cash flows. 2 Cash outflow and inflow of gross-settled derivatives are undiscounted contractual cash flow and may differ from the amount in the consolidated statement of financial position. Meanwhile, as of December 31, 2023, the Group is obligated to invest ￦ Kiamco Data Center Blind Fund, a related party, and others, and ￦ million and USD thousand to be paid in the future Capital Call method to Future Innovation Private Equity Fund No.3 (Notes 19 and 35). (2) Management of Capital Risk The Group’s objectives when managing capital are to safeguard the Group’s ability to continue as a going concern in order to provide returns for shareholders and benefits for other shareholders and to maintain an optimal capital structure to reduce the cost of capital. The Group’s capital structure consists of liabilities including borrowings, cash and cash equivalents, and shareholders’ equity. The treasury department monitors the Group’s capital structure and considers cost of capital and risks related each capital component. The debt-to-equity ratios as o (in millions of Korean won) December 31, 2022 December 31, 2023 Total liabilities ￦ 22,577,114 ￦ 24,249,073 Total equity 18,412,696 18,542,575 Debt-to-equity ratio 123 % 131 % The Group manages capital on the basis of the gearing ratio. This ratio is calculated as net debt divided by total capital. Net debt is calculated as total borrowings less cash and cash equivalents. Total capital is calculated as ‘equity’ in the statement of financial position plus net debt. The gearing ratios as of (in millions of Korean won, %) December 31, 2022 December 31, 2023 Total borrowings ￦ 10,006,685 ￦ 10,218,165 Less: cash and cash equivalents (2,449,062 ) (2,879,554 ) Net debt 7,557,623 7,338,611 Total equity 18,412,696 18,542,575 Total capital 25,970,319 25,881,186 Gearing ratio 29 % 28 % (3) Offsetting Financial Assets and Financial Liabilities 1) Details of the Group’s recognized financial assets subject to enforceable master netting arrangements or similar agreements are as follows: (in millions of Korean won) December 31, 2022 Gross assets Gross Net amounts Amounts not offset Net Financial Cash Trade receivables ￦ 60,512 ￦ —  ￦ 60,512 ￦ (44,518 ) ￦ —  ￦ 15,994 Other financial assets 764 (764 ) —  —  —  —  Total ￦ 61,276 ￦ (764 ) ￦ 65,012 ￦ (44,518 ) ￦ —  ￦ 15,994 (in millions of Korean won) December 31, 2023 Gross assets Gross Net amounts Amounts not offset Net Financial Cash Trade receivables ￦ 78,415 ￦ (1,407 ) ￦ 77,008 ￦ (59,148 ) ￦ —  ￦ 17,860 Other financial assets 759 (757 ) 2 (2 ) —  —  Total ￦ 79,174 ￦ (2,164 ) ￦ 77,010 ￦ (59,150 ) ￦ —  ￦ 17,860 These include price subject to netting arrangements on facility interconnection and data sharing among telecommunication companies. 2) The Group’s recognized financial liabilities subject to enforceable master netting arrangements or similar agreements are as follows: (in millions of Korean won) December 31, 2022 Gross Gross offset Net amounts position Amounts not offset Net Financial Cash Trade payables ￦ 47,271 ￦ (764 ) ￦ 46,507 ￦ (44,518 ) ￦ —  ￦ 1,989 (in millions of Korean won) December 31, 2023 Gross Gross offset Net amounts position Amounts not offset Net Financial Cash Trade payables ￦ 59,602 ￦ (757 ) ￦ 58,845 ￦ (56,196 ) ￦ —  ￦ 2,649 Other financial assets 4,362 (1,407 ) 2,955 (2,955 ) —  —  Total ￦ 63,964 ￦ (2,164 ) ￦ 61,800 ￦ (59,151 ) ￦ —  ￦ 2,649 These include price subject to netting arrangements on facility interconnection and data sharing among telecommunication companies.

Fair Value

Fair Value	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
Fair Value	37. Fair Value (1) Fair Value of Financial Instruments by Category Carrying amount and fair value of financial instruments by category as of December 31, 2022 and 2023, are as follows: December 31, 2022 December 31, 2023 (in millions of Korean won) Carrying Fair value Carrying Fair value Financial assets Cash and cash equivalents ￦ 2,449,062   1 ￦ 2,879,554   1 Trade and other receivables Financial assets measured at amortized cost 2 7,364,516   1 8,326,229   1 Financial assets at fair value through other comprehensive income 129,124 129,124 116,198 116,198 Other financial assets Financial assets measured at amortized cost 1,060,058   1 1,385,921   1 Financial assets at fair value through profit or loss 1,064,856 1,064,856 939,661 939,661 Financial assets at fair value through other comprehensive income 1,508,192 1,508,192 1,680,168 1,680,168 Derivative financial assets for hedging 190,830 190,830 159,211 159,211 Total ￦ 13,766,638 ￦ 15,486,942 Financial liabilities Trade and other payables 3 ￦ 8,397,264   1 ￦ 8,317,822   1 Borrowings 10,006,685 9,405,992 10,218,165 9,979,545 Other financial liabilities Financial liabilities at amortized cost 246,606   1 915,185   1 Financial liabilities at fair value through profit or loss 141,280 141,280 136,106 136,106 Derivative financial liabilities for hedging purpose 33,555 33,555 24,547 24,547 Total ￦ 18,825,390 ￦ 19,611,825 1 The Group did not conduct fair value estimation since the book amount is a reasonable approximation of the fair value. 2 Lease receivables are excluded from fair value disclosure in accordance with IFRS 7. 3 Amounts related to employee benefit plans are included in trade and other payables at the end of previous year. (2) Fair Value Hierarchy To provide an indication about the reliability of the inputs used in determining fair value, the Group classifies its financial instruments into the three levels prescribed under the accounting standards. Financial instruments that are measured at fair value are categorized by the fair value hierarchy, and the defined levels are as follows: • Level 1: The fair value of financial instruments traded in active markets is based on quoted market prices at the end of the reporting period. The quoted market price used for financial assets held by the Group is the current bid price. These instruments are included in level 1. • Level 2: The fair value of financial instruments that are not traded in active markets is determined using valuation techniques which maximize the use of observable market data and rely as little as possible on entity-specific estimates. If all significant inputs required to fair value an instrument are observable, the instrument is included in level 2. • Level 3: If one or more of the significant inputs is not based on observable market data, the instrument is included in level 3. Fair value hierarchy classifications of the financial assets and financial liabilities that are measured at fair value disclosed in fair value as of December 31, 2022 and 2023, are as follows: (in millions of Korean won) December 31, 2022 Level 1 Level 2 Level 3 Total Assets Trade and other receivables Financial assets at fair value through other comprehensive income ￦ —  ￦ 129,124 ￦ —  ￦ 129,124 Other financial assets Financial assets at fair value through profit or loss 26,647 426,140 612,069 1,064,856 Financial assets at fair value through other 1,005,900 5,163 497,129 1,508,192 Derivative financial assets for hedging —  189,717 1,113 190,830 Investment properties —  —  5,370,047 5,370,047 Total ￦ 1,032,547 ￦ 750,144 ￦ 6,480,358 ￦ 8,263,049 Liabilities Borrowings ￦ —  ￦ 9,405,992 ￦ —  ￦ 9,405,992 Other financial liabilities Financial liabilities at fair value through profit or loss —  —  141,280 141,280 Derivative financial liabilities for hedging purpose —  33,555 —  33,555 Total ￦ —  ￦ 9,439,547 ￦ 141,280 ￦ 9,580,827 (in millions of Korean won) December 31, 2023 Level 1 Level 2 Level 3 Total Assets Trade and other receivables Financial assets at fair value through other comprehensive income ￦ —  ￦ 116,198 ￦ —  ￦ 116,198 Other financial assets Financial assets at fair value through profit or loss 13,911 156,918 768,832 939,661 Financial assets at fair value through other comprehensive income 1,230,936 5,206 444,026 1,680,168 Derivative financial assets for hedging —  159,211 —  159,211 Investment properties —  —  5,276,169 5,276,169 Total ￦ 1,244,847 ￦ 437,533 ￦ 6,489,027 ￦ 8,171,407 Liabilities Borrowings ￦ —  ￦ 9,979,545 ￦ —  ￦ 9,979,545 Other financial liabilities Financial liabilities at fair value through profit or loss —  1,545 134,561 136,106 Derivative financial liabilities for hedging purpose —  24,547 —  24,547 Total ￦ —  ￦ 10,005,637 ￦ 134,561 ￦ 10,140,198 (3) Transfers Between Fair Value Hierarchy Levels of Recurring Fair Value Measurements 1) Details of transfers between Level 1 and Level 2 of the fair value hierarchy for recurring fair value measurements There are no transfers between Level 1 and Level 2 of the fair value hierarchy for the recurring fair value measurements. 2) Details of changes in Level 3 of the fair value hierarchy for recurring fair value measurements. Details of changes in Level 3 of the fair value hierarchy for the recurring fair value measurements as of December 31, 2022 and 2023, are as follows: 2022 Financial assets Financial liabilities (in millions of Korean won) Financial assets Financial assets Derivative Financial Beginning balance ￦ 577,085 ￦ 323,373 ￦ 31,565 ￦ 215,332 Acquisition 226,310 262,408 —  3,046 Reclassification (8,962 ) 8,122 —  (54,921 ) Acquisition and disposition of businesses —  (40 ) —  —  Disposal (179,740 ) (97,426 ) (31,565) —  Amount recognized in profit or loss 1 (2,624 ) 18 —  (22,177 ) Amount recognized in other comprehensive income 2 —  674 1,113 —  Ending balance ￦ 612,069 ￦ 497,129 ￦ 1,113 ￦ 141,280 1 The recognition of gains and losses on derivatives financial liabilities (assets) for hedging purposes consists entirely of derivatives valuation losses. 2 The recognition of gains and losses on financial liabilities measured at fair value through profit or loss consists of derivative valuation losses. 2023 Financial assets Financial liabilities (in millions of Korean won) Financial assets Financial assets Derivative Financial Beginning balance ￦ 612,069 ￦ 497,129 ￦ 1,113 ￦ 141,280 Acquisition 216,838 10,267 —  —  Reclassification 26,471 (5,532 ) (1,113) (7,363 ) Acquisition and disposition of businesses 252 —  —  —  Disposal (44,323 ) (6 ) —  (5,205 ) Amount recognized in profit or loss 1, (42,475 ) (61 ) —  5,849 Amount recognized in other comprehensive income —  (57,771 ) —  —  Ending balance ￦ 768,832 ￦ 444,026 ￦ —  ￦ 134,561 1 The recognition of gains and losses on financial liabilities measured at fair value through profit or loss consists of derivative valuation gains and losses. (4) Valuation Technique and the Inputs Valuation techniques and inputs used in the recurring, non-recurring fair value measurements and disclosed fair values categorized within Level 2 and Level 3 of the fair value hierarchy as of December 31, 2022 and 2023, are as follows: (in millions of Korean won) December 31, 2022 Fair value Level Valuation techniques Inputs Assets Trade and other receivables Financial assets at fair value through other comprehensive income ￦ 129,124 2 DCF Model Guaranteed bond interest rate Other financial assets Financial assets at fair value through profit or loss 1,038,209 2,3 DCF Model Adjusted Net Asset Model, Monte-Carlo Simulation Market Interest rate, Underlying asset price Financial assets at fair value through other comprehensive income 502,292 2,3 DCF Model, Market Approach Model Discount rate Derivative financial assets for hedging 190,830 2,3 DCF Model Market observation Swap interest rate Investment properties 5,370,047 3 DCF Model Liabilities Borrowings ￦ 9,405,992 2 DCF Model Bond interest rate Other financial liabilities Financial liabilities at fair value through profit or loss 141,280 3 DCF Model Monte-Carlo Simulation Forward exchange rate Derivative financial liabilities for hedging 33,555 2 DCF Model Market observation (in millions of Korean won) December 31, 2023 Fair value Level Valuation techniques Inputs Assets Trade and other receivables Financial assets at fair value through other comprehensive income ￦ 116,198 2 DCF Model Guaranteed bond interest rate Other financial assets Financial assets at fair value through profit or loss 925,750 2,3 DCF Model Monte-Carlo Simulation Market Interest rate, Underlying asset price Financial assets at fair value through other comprehensive income 449,232 2,3 DCF Model Market Approach Model Discount rate Derivative financial assets for hedging 159,211 2 DCF Model Market observation discount rate, Swap interest rate Investment properties 5,276,169 3 DCF Model Liabilities Borrowings ￦ 9,979,545 2 DCF Model Bond interest rate Other financial liabilities Financial liabilities at fair value through profit or loss 136,106 2,3 DCF Model Binomial Option Pricing Model, Forward exchange rate Forward interest rate Derivative financial liabilities for hedging 24,547 2 DCF Model Market observation discount rate (5) Valuation Processes for Fair Value Measurements Categorized Within Level 3 The Group uses external experts that perform the fair value measurements required for financial reporting purposes. External experts report directly to the chief financial officer (CFO) and discuss the valuation processes and results with the CFO in line with the Group’s closing dates. ( 6 Gains and losses on valuation at the transaction date In the case that the Group values derivative financial instruments using inputs not based on observable market data, and the fair value calculated by the said valuation technique differs from the transaction price, then the fair value of the financial instruments is recognized as the transaction price. The difference between the fair value at initial recognition and the transaction price is deferred and amortized using a straight-line method by maturity of the financial instruments. However, in the case that inputs of the valuation techniques become observable in markets, the remaining deferred difference is immediately recognized in full in profit or loss. In relation to this, details and changes of the total deferred difference for the years ended December 31, 2022 and 2023, are as follows: (in millions of Korean won) 2022 2023 Derivatives used Derivatives used I. Beginning balance ￦ 832 ￦ — II. New transactions —  —  III. Recognized at fair value through profit or loss (832 ) — IV. Ending balance (I+II+III) ￦ —  ￦ —

Interests in Unconsolidated Str

Interests in Unconsolidated Structured Entities	12 Months Ended
	Dec. 31, 2023
Investments accounted for using equity method [abstract]
Interests in Unconsolidated Structured Entities	38. Interests in Unconsolidated Structured Entities (1) Details of information about its interests in unconsolidated structured entities, which the Group does not have control over, including the nature, purpose and activities of the structured entity and how the structured entity is financed, are as follows: Classes of entities Nature, purpose, activities and others Real estate finance A structured entity incorporated for the purpose of real estate development is provided with funds by investors’ investments in equity and borrowings from financial institutions (including long-term and short-term loans and issuance of Asset Backed Commercial Paper (“ABCP”) due in three months), and based on these, the structured entity implements activities such as real estate acquisition, development and mortgage loans. The structured entity repays loan principals with funds incurred from instalment house sales after the completion of real estate development or with collection of the principal of mortgage loan. The remaining shares are distributed to investors. As of December 31, 2023, this entity is engaged in real estate finance structured entity and generates revenues by receiving dividends from direct investments in or receiving interests on loans to the structured entity. Financial institutions, including the Entity, are provided with guarantees including joint guarantees or real estate collateral from investors and others. Consequently, the entity is a priority over other parties in the preservation of claim. However, when the credit rating of investors and others decreases or when the value of real estate decreases, the entity may be obliged to cover losses. PEF and investment funds Minority investors including managing members contribute to Private Equity Fund (“PEF”) and investment funds incorporated for the purpose of providing funds to the small, medium, or venture entities, and the managing member implements activities such as investments in equity or loans based on the contributions. As of December 31, 2023, the entity is engaged in PEF and investment funds structured entity, and after contributing to PEF and investment funds, the entity receives dividends for operating revenues from these contributions. The entity is provided with underlying assets of PEF and investment funds as collateral. However, when the value of the underlying assets decreases, the entity may be obliged to cover losses. Asset securitization The Group transfers accounts receivable for handset sales to its Special Purpose Company (“SPC”) for asset securitization. SPC issues the asset-backed securities with accounts receivable for handset sales as an underlying asset and makes payment for the underlying asset acquired. (2) Details of scale of unconsolidated structured entities and nature of the risks associated with an entity’s interests in unconsolidated structured entities as of (in millions of Korean won) December 31, 2022 Real Estate PEF and Asset Total Total assets of unconsolidated structured entities ￦ 3,539,827 ￦ 5,580,445 ￦ 2,044,989 ￦ 11,165,261 Assets recognized in statement of financial position Other financial assets ￦ 77,819 ￦ 237,907 ￦ —  ￦ 315,726 Joint ventures and associates 123,138 268,275 —  391,413 Total ￦ 200,957 ￦ 506,182 ￦ —  ￦ 707,139 Maximum loss exposure 1 Investment assets ￦ 200,957 ￦ 506,182 ￦ —  ￦ 707,139 Investment agreement and others 2 40,914 91,224 —  132,138 Total ￦ 241,871 ￦ 597,406 ￦ —  ￦ 839,277 1 Includes the investments recognized in the Group’s financial statements and the amounts which are probable to be determined when certain conditions are met. 2 Investment agreements and others include purchase agreements, credit granting and others. (in millions of Korean won) December 31, 2023 Real Estate PEF and Asset Total Total assets of unconsolidated structured entities ￦ 7,890,823 ￦ 4,833,966 ￦ 1,846,270 ￦ 14,571,059 Assets recognized in statement of financial position Other financial assets ￦ 216,040 ￦ 227,266 ￦ —  ￦ 443,306 Joint ventures and associates 144,517 282,550 —  427,067 Total ￦ 360,557 ￦ 509,816 ￦ —  ￦ 870,373 Maximum loss exposure 1 Investment assets ￦ 360,557 ￦ 509,816 ￦ —  ￦ 870,373 Investment agreement and others 2 44,975 106,064 —  151,039 Total ￦ 405,532 ￦ 615,880 ￦ —  ￦ 1,021,412 1 Includes the investments recognized in the Group’s financial statements and the amounts which are probable to be determined when certain conditions are met. 2 Investment agreements and others include purchase agreements, credit granting and others.

Information About Non-controlli

Information About Non-controlling Interests	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
Information About Non-controlling Interests	39. Information About Non-controlling Interests ( ) Profit or loss allocated to non-controlling interests and accumulated non-controlling interests of subsidiaries that are material to the Group for the years ended December 31, 2021, 2022 and 2023 are as follows: (In millions of Korean won) December 31, 2021 Non- controlling rate (%) Accumulated non-controlling Profit or loss non-controlling Dividends to non- Others Accumulated non-controlling KT Skylife Co., Ltd. 49.7 % ￦ 388,900 ￦ 24,795 ￦ (8,279 ) ￦ 5,279 ￦ 410,695 BC Card Co., Ltd. 30.5 % 411,826 34,496 (6,434 ) 59,040 498,928 KTIS Corporation 68.6 % 120,071 17,715 (1,837 ) (709 ) 135,240 KTCS Corporation 79.7 % 129,502 21,394 (2,211 ) (3,574 ) 145,111 Nasmedia, Co., Ltd. 56.0 % 112,549 15,185 (3,808 ) 255 124,181 (In millions of Korean won) December 31, 2022 Non- controlling Accumulated non-controlling Profit or loss non-controlling Dividends to non- Others Accumulated non-controlling KT Skylife Co., Ltd. 49.8 % ￦ 410,695 ￦ 7,127 ￦ (8,284 ) ￦ 13,651 ￦ 423,189 BC Card Co., Ltd. 30.5 % 498,928 47,909 (7,641 ) (14,539 ) 524,657 KTIS Corporation 66.7 % 135,240 14,965 (2,226 ) (6,577 ) 141,402 KTCS Corporation 78.3 % 145,111 18,888 (2,721 ) (7,397 ) 153,881 Nasmedia, Co., Ltd. 56.0 % 124,181 15,610 (4,187 ) (179 ) 135,425 (In millions of Korean won) December 31, 2023 Non- controlling Accumulated non-controlling Profit or loss non-controlling Dividends to non- Others Accumulated non-controlling KT Skylife Co., Ltd. 49.4 % ￦ 423,189 ￦ (47,355 ) ￦ (8,287 ) ￦ (6,192 ) ￦ 361,355 BC Card Co., Ltd. 30.5 % 524,657 25,355 (4,960 ) 3,023 548,075 KTIS Corporation 66.7 % 141,402 5,947 (2,451 ) (1,872 ) 143,026 KTCS Corporation 78.3 % 153,881 14,228 (3,001 ) (2,313 ) 162,795 Nasmedia Co., Ltd 55.9 % 135,425 10,679 (4,028 ) (467 ) 141,609 ( ) The summarized financial information for each subsidiary with non-controlling interests that are material to the Group, before inter-company eliminations, is as follows: December 31, 2022 (in millions of Korean won) KT Skylife BC Card Co., KTIS KTCS Nasmedia, Current assets ￦ 420,701 ￦ 3,152,622 ￦ 102,121 ￦ 296,209 ￦ 435,359 Non-current assets 938,465 2,513,453 294,087 123,517 81,586 Current liabilities 274,637 2,879,551 103,698 188,379 261,381 Non-current liabilities 229,042 1,229,649 95,506 40,240 14,349 Equity 855,487 1,556,875 197,004 191,107 241,215 December 31, 2023 (in millions of Korean won) KT Skylife BC Card Co., KTIS KTCS Nasmedia, Current assets ￦ 425,661 ￦ 3,739,847 ￦ 111,313 ￦ 304,508 ￦ 411,774 Non-current assets 795,182 2,613,031 336,296 130,391 101,537 Current liabilities 353,839 3,661,263 116,271 187,621 251,207 Non-current liabilities 125,531 1,061,169 127,248 47,228 11,129 Equity 741,473 1,630,446 204,090 200,050 250,975 Summarized consolidated statements of comprehensive income for the years ended December 31, 2021,2022 and 2023 are as follows: 2021 (in millions of Korean won) KT Skylife BC Card Co., KTIS KTCS Nasmedia, Operating revenue ￦ 772,950 ￦ 3,580,970 ￦ 487,801 ￦ 968,499 ￦ 125,876 Profit for the year 62,309 120,308 24,944 19,034 27,120 Other comprehensive income (loss) 12,686 2,270 3,725 (2,120 ) 871 Total comprehensive income 74,995 122,578 28,669 16,914 27,991 2022 (in millions of Korean won) KT Skylife BC Card Co., KTIS KTCS Nasmedia, Operating revenue ￦ 1,038,468 ￦ 3,897,090 ￦ 536,229 ￦ 1,031,010 ￦ 153,210 Profit for the year 20,941 148,341 15,917 17,634 27,691 Other comprehensive income (loss) 13,544 (5,286 ) (2,415 ) (134 ) (695 ) Total comprehensive income 34,485 143,055 13,502 17,500 26,996 2023 (in millions of Korean won) KT Skylife BC Card Co., KTIS KTCS Nasmedia, Operating revenue ￦ 1,034,342 ￦ 4,027,450 ￦ 593,162 ￦ 1,035,911 ￦ 147,934 Profit for the year (109,407 ) 76,545 13,922 15,804 17,703 Other comprehensive income (loss) (6,625 ) 13,832 (3,162 ) (2,550 ) (1,890 ) Total comprehensive income (116,032 ) 90,377 10,760 13,254 15,813 Summarized consolidated statements of cash flows for the years ended December 31, 2021,2022 and 2023 are as follows: 2021 (in millions of Korean won) KT Skylife BC Card Co., KTIS KTCS Nasmedia, Cash flows from operating activities ￦ 102,947 ￦ (157,645 ) ￦ 49,011 ￦ 6,945 ￦ 44,500 Cash flows from investing activities (352,116 ) (283,313 ) (27,143 ) (1,039 ) (16,966 ) Cash flows from financing activities 230,010 526,563 (23,126 ) (16,622 ) (9,843 ) Net increase (decrease) in cash and cash equivalents (19,159 ) 85,605 (1,258 ) (10,716 ) 17,691 Cash and cash equivalents at beginning of year 99,834 240,584 31,779 75,440 53,720 Exchange differences (3 ) 293 —  (840 ) (15 ) Cash and cash equivalents at end of the year 80,672 326,482 30,521 63,884 71,396 2022 (in millions of Korean won) KT Skylife BC Card Co., KTIS KTCS Nasmedia, Cash flows from operating activities ￦ 176,407 ￦ (798,043 ) ￦ 13,809 ￦ 19,423 ￦ 22,015 Cash flows from investing activities (78,928 ) (7,733 ) 9,813 13,245 3,845 Cash flows from financing activities (79,455 ) 914,441 (29,199 ) (35,578 ) (11,136 ) Net increase (decrease) in cash and cash equivalents 18,024 108,665 (5,577 ) (2,910 ) 14,724 Cash and cash equivalents at beginning of year 80,672 326,482 30,521 63,884 71,396 Exchange differences (1 ) (100 ) —  840 13 Cash and cash equivalents at end of the year 98,695 435,047 24,944 61,814 86,133 2023 (in millions of Korean won) KT Skylife BC Card Co., KTIS KTCS Nasmedia, Cash flows from operating activities ￦ 207,207 ￦ 82,883 ￦ 50,892 ￦ 55,146 ￦ 8,116 Cash flows from investing activities (125,343 ) (74,430 ) (17,636 ) (5,901 ) (30,910 ) Cash flows from financing activities (50,811 ) (67,609 ) (32,872 ) (26,948 ) (11,077 ) Net increase (decrease) in cash and cash equivalents 31,053 (59,156 ) 384 22,297 (33,871 ) Cash and cash equivalents at beginning of year 98,695 435,047 24,944 61,814 86,133 Exchange differences —  (95 ) —  —  15 Cash and cash equivalents at end of the year 129,748 375,796 25,328 84,111 52,277 (3) Transactions with Non-controlling Interests The effect of changes in the ownership interest on the equity attributable to owners of the Group for the years ended December 31, 2021, 2022 and 2023 is summarized as follows: (in millions of Korean won) 2021 2022 2023 Carrying amount of non-controlling interests acquired ￦ 14,702 ￦ 19,272 ￦ 3,022 Consideration paid to non-controlling interests 1,095 69,652 213,819 Effect of changes in equity (net amount) ￦ 15,797 ￦ 88,924 ￦ 216,841

Events After the Reporting Peri

Events After the Reporting Period	12 Months Ended
	Dec. 31, 2023
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Events After the Reporting Period	40. Events After the Reporting Period (1) The Company has decided to acquire treasury stocks ( ￦ (695,775 shares) were (2) The company issued the following bonds after the end of the reporting period (unit: ￦ Type Issued Date Annual interest Maturity Korean The 200-1st Public bond Feb. 27, 2024 3.552 % Feb. 27, 2026- 120,000 The 200-2nd Public bond Feb. 27, 2024 3.608 % Feb. 26, 2027- 200,000 The 200-3rd Public bond Feb. 27, 2024 3.548 % Feb. 27, 2029- 80,000

Material Accounting Policies (P

Material Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2023
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Basis of Preparation	2.1 Basis of Preparation The consolidated financial statements of the Group have been prepared in accordance with International Financial Reporting Standards (“IFRS”) as issued by the International Accounting Standards Board (“IASB”). The financial statements have been prepared on a historical cost basis, except for the following: • Certain financial assets and liabilities (including derivative instruments) • Defined benefit pension plans – plan assets measured at fair value The preparation of the consolidated financial statements requires the use of critical accounting estimates. Management also needs to exercise judgement in applying the Group’s accounting policies. The areas involving a higher degree of judgment or complexity, or areas where assumptions and estimates are significant to the consolidated financial statements are disclosed in Note 3.
Changes in Accounting Policy and Disclosures	2.2 Changes in Accounting Policy and Disclosures (a) New and amended standards and interpretations adopted by the Group The Group has applied the following standards and interpretations for the first time for their annual reporting period commencing January 1, 2023. - IFRS 17 ‘Insurance Contract’ (Amendment) IFRS 17, which replaces IFRS 4 “Insurance Contracts,” establishes principles for recognition, measurement, and disclosure of insurance contracts, and is mainly characterized by measuring the current cost of insurance liabilities, recognizing insurance returns based on accrual accounting assumption, and marking the distinction between insurance gains and losses on investment. The Group does not have any contracts that meet the definition of an insurance contract under IFRS 17. - IAS 1 Presentation of Financial Statements IFRS Practice Statement 2 Making Materiality Judgements The amendments change the requirements in IAS 1 with regard to disclosure of accounting policies. The amendments replace all instances of the term ‘significant accounting policies’ with ‘material accounting policy information’. Accounting policy information is material if, when considered together with other information included in an entity’s financial statements, it can reasonably be expected to influence decisions that the primary users of general purpose financial statements make on the basis of those financial statements. The supporting paragraphs in IAS 1 are also amended to clarify that accounting policy information that relates to immaterial transactions, other events or conditions is immaterial and need not be disclosed. Accounting policy information may be material because of the nature of the related transactions, other events or conditions, even if the amounts are immaterial. However, not all accounting policy information relating to material transactions, other events or conditions is itself material. The IASB has also developed guidance and examples to explain and demonstrate the application of the ‘four-step materiality process’ described in IFRS Practice Statement 2. - IAS 1 Presentation of Financial Statements The amendments require disclosure of valuation gains or losses (limited to those recognized in the profit or loss) of the conversion options or warrants (or financial liabilities including them), if all or part of the financial instrument with exercise price that is adjusted depending on the issuer’s share price change is classified as financial liability as defined in paragraph of IAS 32 – Financial Instrument: Presentation. - IAS 8 Accounting Polices, Changes in Accounting Estimates and Errors The amendments replace the definition of a change in accounting estimates with a definition of accounting estimates. Under the new definition, accounting estimates are “monetary amounts in financial statements that are subject to measurement uncertainty”. The definition of a change in accounting estimates was deleted. - IAS 12 Income Taxes The amendments introduce a further exception from the initial recognition exemption. Under the amendments, an entity does not apply the initial recognition exemption for transactions that give rise to equal taxable and deductible temporary differences. Depending on the applicable tax law, equal taxable and deductible temporary differences may arise on initial recognition of an asset and liability in a transaction that is not a business combination and affects neither accounting nor taxable profit. For example, this may arise upon recognition of a lease liability and the corresponding right-of-use asset applying IFRS 16 at the commencement date of a lease. Following the amendments to IAS 12, an entity is required to recognise the related deferred tax asset and liability, with the recognition of any deferred tax asset being subject to the recoverability criteria in IAS 12. - IAS 12 Income Taxes The amendment clarifies that IAS 12 Income Taxes However, by introducing a temporary exception to the deferred tax accounting requirements of IAS 12 Income Taxes There is no significant impact of the amendments listed above on the consolidated financial statements. (b) New standards and interpretations not yet adopted by the Group The following new accounting standards and interpretations that have been published are not mandatory for December 31, 2023 reporting periods and have not been early adopted by the Group. - IAS 1 Presentation of Financial Statements The amendments clarify that the classification of liabilities as current and non-current is based on rights that are existing at the end of the reporting period, specify that classification is unaffected by expectations about whether an entity will exercise its right to defer settlement of a liability, explain that rights are in existence if covenants are complied with at the end of the reporting period, and introduce a definition of ‘settlement’ to make clear that settlement refers to the transfer to the counterparty of cash, equity instruments, other assets or services. - IAS 1 Presentation of Financial Statements The amendments regulate that only certain conditions in the borrowing arrangement (referred to as the “Agreement”) that must be observed before the end of the reporting period affect the right of the entity to defer repayment of the liability for at least 12 months after the reporting period. Even if compliance with the agreement is assessed only after the reporting period, these arrangements affect the existence of the right as of the end of the reporting period. It also regulates that arrangements that must be observed only after the reporting period do not affect the right to defer settlement. However, if the Group’s right to defer settlement of a liability depends on the agreement that complies with within 12 months of the reporting period, disclosing the information to help users of financial statements understand the risk that the liability could be repaid within 12 months of the reporting period. This information includes information about the agreements (including the nature of the agreements, when the Group is required to comply), the carrying amount of the relevant liabilities, and the facts and circumstances indicating that they may be difficult to satisfying with. The above amendments are applied retrospectively for annual reporting periods beginning on or after 1 January 2024, with early application permitted. - IAS 7 ‘Cash Flow Statement’ and ‘Financial Instruments Disclosure’- Supplier Financial Agreement(Amendment) The amendment adds the purpose of disclosure in IAS 7 ‘Cash Flow Statement’, users of financial statements should disclose information about supplier financial agreements so that they can assess the affect of them on the Group’s liabilities and cash flows. In addition, supplier financial agreements were added as an example of the requirement to amend IAS 7 to disclose information about exposure to liquidity risk concentration. The term ‘supplier financial agreements’ is not defined; instead, the amendment presents the nature of the arrangement that should be informed. For achieving the purpose of disclosure, the following information on supplier financial agreements must be disclosed in an integrated manner. • the terms and conditions of an agreement • The carrying amount of financial liabilities corresponding to the supplier’s financial agreement and the items displayed in the statement of financial position in relation to the financial liabilities • The carrying amount corresponding to the portion of the financial liabilities that the supplier has already received from the financial provider and the items displayed in the statement of financial position in relation to the financial liabilities • The scope of payment date for financial liabilities corresponding to supplier financial agreements and the scope of payment date for comparable purchase liabilities not corresponding to supplier financial agreements • Types of non-cash changes in the carrying amount of financial liabilities corresponding to supplier financial agreements and their impact • Liquidity risk information The above amendments are applied retrospectively for annual reporting periods beginning on or after 1 January 2024, with early application permitted. - IFRS 16 ‘Lease’ – Lease liabilities arising from leaseback (Amendment) The amendment adds a follow-up measurement requirement for leaseback that is accounted for as sales by applying IFRS 15 ‘revenue from contracts with customers’. The amendment requires the seller to calculate a ‘lease fee’ or an ‘modified lease fee’ in such a way that the seller-less user does not recognize any difference or gain for the right to use that the seller-less user continues to hold after the lease commencement date. The above amendments are applied retrospectively for annual reporting periods beginning on or after 1 January 2024, with early application permitted. - IAS 1 Presentation of Financial Statements (revised in 2023) – Disclosure of Virtual Assets The amendments, in addition to the disclosure requirements required by other Standards for transactions related to virtual assets, define the requirements for disclosure in each case: 1) holding virtual assets; 2) holding virtual assets on behalf of customers; and 3) issuing virtual assets. If a virtual asset is held, information on the general information of the virtual asset, the applied accounting policy, the acquisition path, acquisition cost, and fair value of each virtual asset should be disclosed. In addition, when a virtual asset is issued, the performance status related to the issued virtual asset, the moment and the exposure of revenue recognition of the sold virtual asset, the quantity of virtual assets held after issuance, and important contract details should be disclosed. The above amendments are applied retrospectively for annual reporting periods beginning on or after 1 January 2024, with early application permitted. - IFRS 18 Presentation and Disclosure in financial statements (Amendment) The purpose of the amendment is to set out requirements for the presentation and disclosure of information in general purpose financial statements (financial statements) to help ensure they provide relevant information that faithfully represents an entity’s assets, liabilities, equity, income and expenses. IFRS 18 applies to all financial statements that are prepared and presented in accordance with International Financial Reporting Standards and replaces IAS 1 Presentation of Financial Statements. The key changes included in the amendments include (1) an introduction of a defined structure for the statement of profit or loss including categories for classifying incomes and expenses, subtotals for operating profit and profit before financing and income taxes, (2) an introduction of specific disclosure requirements related to the statement of profit or loss which include but are not limited to management-defined performance measures, (3) enhanced guidance on the principles of aggregation and disaggregation which focus on grouping items based on their shared characteristics and (4) some other limited changes to presentation and disclosures in the financial statements. The above amendments are applied retrospectively for annual reporting periods beginning on or after 1 January 2027, with early application permitted. The Group is reviewing the impact of the above-listed amendments on the consolidated financial statements.
Consolidation	2.3 Consolidation The Group has prepared the consolidated financial statements in accordance with IFRS 10 Consolidated Financial Statements (a) Subsidiaries Subsidiaries are all entities (including special purpose entities (“SPEs”)) over which the Group has control. The Group controls an entity when the Group is exposed to, or has rights to, variable returns from its involvement with the entity and has the ability to affect those returns through its power to direct the activities of the entity. Subsidiaries are fully consolidated from the date on which control is transferred to the Group. They are deconsolidated from the date that control ceases. The acquisition method of accounting is used to account for business combinations by the Group. The consideration transferred is measured at the fair values of the assets transferred, and identifiable assets acquired, and liabilities and contingent liabilities assumed in a business combination are measured initially at their fair values at the acquisition date. The Group recognizes any non-controlling interest in the acquired entity on an acquisition-by-acquisition basis either at fair value or at the non-controlling interest’s proportionate share of the acquired entity’s net identifiable assets. All other non-controlling interests are measured at fair values, unless otherwise required by other standards. Acquisition-related costs are expensed as incurred. The excess of consideration transferred, amount of any non-controlling interest in the acquired entity and acquisition-date fair value of any previous equity interest in the acquired entity over the fair value of the net identifiable assets acquired is recoded as goodwill. If those amounts are less than the fair value of the net identifiable assets of the business acquired, the difference is recognized directly in the profit or loss as a bargain purchase. Intercompany transactions, balances and unrealized gains on transactions among group companies are eliminated. Unrealized losses are also eliminated unless the transaction provides evidence of an impairment of the transferred asset. Accounting policies of subsidiaries have been changed where necessary to ensure consistency with the policies adopted by the Group. (b) Changes in ownership interests in subsidiaries without loss of control Any differences between the amount of the adjustment to non-controlling interest that do not result in loss of control and any consideration paid or received is recognized in a separate reserve within equity attributable to owners of the Controlling Company. (c) Disposal of subsidiaries When the Group ceases to have control over a subsidiary, any retained interest in the subsidiary is remeasured to its fair value with the change in carrying amount recognized in profit or loss. (d) Associates Associates are entities over which the Group has significant influence but does not possess control or joint control. Investments in associates are accounted for using the equity method of accounting, after initially being recognized at cost. Unrealized gains on transactions between the Group and its associates are eliminated to the extent of the Group’s interest in the associates. If the Group’s share of losses of an associate equals or exceeds its interest in the associate (including long-term interests that, in substance, form part of the Group’s net investment in the associate), the Group discontinues recognizing its share of further losses. After the Group’s interest is reduced to zero, additional losses are provided for, and a liability is recognized, only to the extent that the Group has incurred legal or constructive obligations or made payments on behalf of the associate. If there is an objective evidence of impairment for the investment in the associate, the Group recognizes the difference between the recoverable amount of the associate and its book amount as impairment loss. If an associate uses accounting policies other than those of the Group for transactions and events in similar circumstances, if necessary, adjustments shall be made to make the associate’s accounting policies conform to those of the Group when the associate’s financial statements are used by the Group in applying the equity method. (e) Joint arrangements A joint arrangement, wherein two or more parties have joint control, is classified as either a joint operation or a joint venture. A joint operator recognizes its direct right to the assets, liabilities, revenues, and expenses of joint operations and its share of any jointly held or incurred assets, liabilities, revenues, and expenses. A joint venture has rights to the net assets relating to the joint venture and accounts for that investment using the equity method.
Segment Reporting	2.4 Segment Reporting Information of each operating segment is reported in a manner consistent with the business segment reporting provided to the chief operating decision-maker (Note 34). The chief operating decision-maker is responsible for allocating resources and assessing performance of the operating segments.
Foreign Currency Translation	2.5 Foreign Currency Translation (a) Functional and presentation currency Items included in the financial statements of each of the Group’s entities are measured using the currency of the primary economic environment in which each entity operates (the “functional currency”). The consolidated financial statements are presented in Korean won, which is the Controlling Company’s functional and presentation currency. (b) Transactions and balances Foreign currency transactions are translated into the functional currency using the exchange rates at the dates of the transactions. Foreign exchange gains and losses resulting from the settlement of such transactions and from the translation of monetary assets and liabilities denominated in foreign currencies at year end exchange rates are generally recognized in profit or loss. They are deferred in other comprehensive income if they relate to qualifying cash flow hedges and qualifying effective portion of net investment hedges, or are attributable to monetary part of the net investment in a foreign operation. Foreign exchange gains and losses that relate to financial instruments are presented in the statement of profit or loss, within finance costs. All other foreign exchange gains and losses are presented in the statement of profit or loss within ‘other income’ or ‘other expense’. Non-monetary items that are measured at fair value in a foreign currency are translated using the exchange rates at the date when the fair value was determined. Translation differences on assets and liabilities carried at fair value are reported as part of the fair value gain or loss. For example, translation differences on non-monetary assets and liabilities, such as equities held at fair value through profit or loss, are recognized in profit or loss as part of the fair value gain or loss and translation differences on non-monetary assets, such as equities classified as available-for-sale financial assets, are recognized in other comprehensive income .
Financial Assets	2.6 Financial Assets (a) Classification The Group classifies its financial assets in the following measurement categories: • those to be measured at fair value through profit or loss • those to be measured at fair value through other comprehensive income • those to be measured at amortized cost The classification depends on the Group’s business model for managing the financial assets and the contractual terms of the cash flows. For financial assets measured at fair value, gains and losses will either be recorded in profit or loss or other comprehensive income. For investments in debt instruments, this will depend on the business model in which the investment is held. The Group reclassifies debt investments when, and only when, its business model for managing those assets changes. For investments in equity instruments that are not held for trading, this will depend on whether the Group has made an irrevocable election at the time of initial recognition to account for the equity investment at fair value through other comprehensive income. Changes in fair value of the investments in equity instruments that are not accounted for as other comprehensive income are recognized in profit or loss. (b) Measurement At initial recognition, the Group measures a financial asset at its fair value plus, in the case of a financial asset not at fair value through profit or loss, transaction costs that are directly attributable to the acquisition of the financial asset. Transaction costs of financial assets carried at fair value through profit or loss are expensed in profit or loss. Financial assets with embedded derivatives are considered in their entirety when determining whether their cash flows are solely payment of principal and interest. A. Debt instruments Subsequent measurement of debt instruments depends on the Group’s business model for managing the asset and the cash flow characteristics of the asset. The Group classifies its debt instruments into one of the following three measurement categories: • Amortized cost: Assets that are held for collection of contractual cash flows where those cash flows represent solely payments of principal and interest are measured at amortized cost. A gain or loss on a debt investment that is subsequently measured at amortized cost and is not part of a hedging relationship is recognized in profit or loss when the asset is derecognized or impaired. Interest income from these financial assets is included in ‘finance income’ using the effective interest rate method. • Fair value through other comprehensive income: Assets that are held for collection of contractual cash flows and for selling the financial assets, where the assets’ cash flows represent solely payments of principal and interest, are measured at fair value through other comprehensive income. Movements in the carrying amount are taken through other comprehensive income, except for the recognition of impairment loss (and reversal of impairment loss), interest income and foreign exchange gains and losses which are recognized in profit or loss. When the financial asset is derecognized, the cumulative gain or loss previously recognized in other comprehensive income is reclassified from equity to profit or loss. Interest income from these financial assets is included in ‘finance income’ using the effective interest rate method. Foreign exchange gains and losses are presented in ‘finance income’ or ‘finance costs’ and impairment loss in ‘finance costs’ or ‘operating expenses’. • Fair value through profit or loss: Assets that do not meet the criteria for amortized cost or fair value through other comprehensive income are measured at fair value through profit or loss. A gain or loss on a debt investment that is subsequently measured at fair value through profit or loss and is not part of a hedging relationship is recognized in profit or loss and presented net in the statement of profit or loss within ‘finance income’ or ‘finance costs’ in the period in which it arises. B. Equity instruments The Group subsequently measures all equity investments at fair value. Where the Group’s management has elected to present fair value gains and losses on equity investments in other comprehensive income, there is no subsequent reclassification of fair value gains and losses to profit or loss following the derecognition of the investment. Dividend income from such investments continue to be recognized in profit or loss as ‘finance income’ when the Group’s right to receive payments is established. Changes in the fair value of financial assets at fair value through profit or loss are recognized in ‘finance income’ or ‘finance costs’ in the statement of profit or loss as applicable. Impairment loss (reversal of impairment loss) on equity investments, measured at fair value through other comprehensive income, are not reported separately from other changes in fair value. (c) Impairment The Group assesses on a forward-looking basis the expected credit losses associated with its debt instruments carried at amortized cost and fair value through other comprehensive income. The impairment methodology applied depends on whether there has been a significant increase in credit risk. For trade receivables and lease receivables, the Group applies the simplified approach, which requires expected lifetime credit losses to be recognized from initial recognition of the receivables. (d) Recognition and derecognition Regular way purchases and sales of financial assets are recognized or derecognized on trade-date, the date on which the Group commits to purchase or sell the asset. Financial assets are derecognized when the rights to receive cash flows from the financial assets have expired or have been transferred and the Group has transferred substantially all the risks and rewards of ownership. If a transfer does not result in derecognition because the Group has retained substantially all the risks and rewards of ownership of the transferred asset, the Group continues to recognize the transferred asset in its entirety and recognizes a financial liability for the consideration received. (e) Offsetting of financial instruments Financial assets and liabilities are offset and the net amount reported in the statements of financial position where there is a legally enforceable right to offset the recognized amounts and there is an intention to settle on a net basis or realize the assets and settle the liability simultaneously. The legally enforceable right must not be contingent on future events and must be enforceable in the normal course of business and in the event of default, insolvency or bankruptcy of the Group or the counterparty.
Derivative Instruments	2.7 Derivative Instruments Derivatives are initially recognized at fair value on the date a derivative contract is entered into and are subsequently remeasured to their fair value at the end of each reporting period. The accounting treatment for subsequent changes in fair value depends on whether the derivative is designated as a hedging instrument, and if so, the nature of the item being hedged. The Group has hedge relationships and designates certain derivatives as: • hedges of a particular risk associated with the cash flows of recognized assets and liabilities and highly probable forecast transactions (cash flow hedges) At inception of the hedge relationship, the Group documents the economic relationship between hedging instruments and hedged items including whether changes in the cash flows of the hedging instruments are expected to offset changes in the cash flows of hedged items. The fair values of derivative financial instruments designated in hedge relationships are disclosed in Note 37. The full fair value of a hedging derivative is classified as a non-current asset or liability when the remaining maturity of the hedged item is more than 12 months; it is classified as a current asset or liability when the remaining maturity of the hedged item is less than 12 months. A non-derivative financial asset and a non-derivative financial liability is classified as a current or non-current based on its expected maturity and its settlement, respectively. The effective portion of changes in fair value of derivatives that are designated and qualify as cash flow hedges is recognized in the cash flow hedge reserve within equity to the limit of the cumulative change in fair value (present value) of the hedge item (the present value of the cumulative change in the future expected cash flows of the hedged item) from the inception of the hedge. The ineffective portion is recognized in ‘finance income (costs)’. Amounts of changes in fair value of effective hedging instruments accumulated in equity are recognized as ‘finance income (costs)’ for the periods when the corresponding transactions affect profit or loss. When a hedging instrument expires, or is sold, terminated, exercised, or when a hedge no longer meets the criteria for hedge accounting, any accumulated cash flow hedge reserve at that time remains in equity until the forecast transaction occurs, resulting in the recognition of a non-financial asset such as inventory. When the forecast transaction is no longer expected to occur, the cash flow hedge reserve and deferred costs of hedging that were reported in equity are immediately reclassified to profit or loss.
Trade Receivables	2.8 Trade Receivables Trade receivables are recognized initially at the amount of consideration that is unconditional, unless they contain significant financing components when they are recognized at fair value. Trade receivables are subsequently measured at amortized cost using the effective interest method, less loss allowance. See Note 6 for further information about the Group’s accounting treatment for trade receivables and Note 2.6 (c) for a description of the Group’s accounting policy on impairment.
Inventories	2.9 Inventories Inventories are stated at the lower of cost and net realizable value. Cost is determined using the moving average method, except for inventories in-transit (specific identification method).
Property and Equipment	2.10 Property and Equipment Property and equipment are stated at historical cost less accumulated depreciation and accumulated impairment losses. Historical cost includes expenditures that is directly attributable to the acquisition of the items. Depreciation of all property and equipment, except for land, is calculated using the straight-line method to allocate their cost, net of their residual values, over their estimated useful lives as follows: Useful Life Buildings 5 – 40 years Structures 5 – 40 years Machinery and equipment (Telecommunications equipment and others) 2 – 40 years Vehicles 4 – 10 years Tools 2 – 6 years Office equipment 2 – 8 years The depreciation method, residual values, and useful lives of property and equipment are reviewed at the end of each reporting period and, if appropriate, accounted for as changes in accounting estimates.
Investment Property	2.11 Investment Property Real estate
Intangible Assets	2.12 Intangible Assets (a) Goodwill Goodwill is measured as explained in Note 2.3 (a) and goodwill arising from acquisition of subsidiaries and businesses is included in intangible assets. Goodwill is tested annually for impairment and carried at cost less accumulated impairment losses. Gains and losses on the disposal of subsidiaries and business include the carrying amount of goodwill relating to the subsidiaries and businesses sold. For the purpose of impairment testing, goodwill acquired in a business combination is allocated to each of the CGUs, or group of CGUs, that is expected to benefit from the synergies of the combination. Goodwill is monitored at the operating segment level. (b) Intangible assets excluding goodwill Intangible assets, except for goodwill, are initially recognized at its historical cost, and carried at cost less accumulated amortization and accumulated impairment losses. Membership rights (condominium membership and golf membership), subscription rights, broadcast license, facility-use rights, and transportation rights that have indefinite useful life are not subject to amortization because there is no foreseeable limit to the period over which the assets are expected to be utilized . The Group amortizes intangible assets with a limited useful life using the straight-line method over the following periods: Useful Life Development costs 3 – 10 years  Software 3 – 10 years  Frequency usage rights 5 – 10 years  Others 1 1 – 50 years  1 Membership rights (condominium membership and golf membership), subscription rights, broadcast license, facility usage rights and transportation license included in others are classified as intangible assets with indefinite useful life.
Borrowing Costs	2.1 3 Borrowing Costs General and specific borrowing costs that are directly attributable to the acquisition, construction or production of a qualifying asset are capitalized during the period of time that is required to complete and prepare the asset for its intended use or sale. Investment income earned on the temporary investment of specific borrowings on qualifying assets is deducted from the borrowing costs eligible for capitalization. Other borrowing costs are expensed in the period in which they are incurred.
Government Grants	2.1 4 Government Grants Grants from the government are recognized at their fair value where there is a reasonable assurance that the grant will be received and the Group will comply with all attached conditions. Government grants related to assets are presented in the statement of financial position by setting up the grant as deferred income that is recognized in profit or loss on a systematic basis over the useful life of the asset. Grants related to income are deferred and are presented as a credit in the statement of profit or loss within ‘other income’.
Impairment of Non-Financial Assets	2.1 5 Impairment of Non-Financial Assets Goodwill and intangible assets with indefinite useful life are tested annually for impairment at the end of each reporting period. If certain assets are deemed to be impaired, their recoverable amount is estimated in order to determine the impairment loss. The Group estimates the recoverable amount for each asset, and, in cases when the recoverable amount cannot be estimated for an asset, the recoverable amount of the cash generating unit to which the asset belongs is estimated. Corporate assets are allocated to individual cash generating units on a reasonable and consistent basis and if they cannot be allocated to individual cash generating units, they are allocated to the smallest group of cash generating units on a reasonable and consistent basis. An impairment loss is recognized for the amount by which the asset’s carrying amount exceeds its recoverable amount (higher of its fair value less costs of disposal and value in use). Impairment loss on non-financial assets other than goodwill are evaluated for reversal at the end of each reporting period.
Trade and other payables	2.1 6 Trade and Other Payables These amounts represent liabilities for goods and services provided to the Group prior to the end of reporting period which are unpaid. Trade and other payables are presented as current liabilities, unless payment is not due within 12 months after the reporting period. They are recognized initially at their fair value and subsequently measured at amortized cost using the effective interest method.
Financial Liabilities	2.1 7 Financial Liabilities (a) Classification and measurement The Group’s financial liabilities at fair value through profit or loss are financial instruments held for trading. A financial liability is held for trading if it is incurred principally for the purpose of repurchasing in the near term. Derivatives that are not designated as hedging instruments or derivatives separated from financial instruments containing embedded derivatives are also categorized as held for trading. The Group classifies non-derivative financial liabilities, except for financial liabilities at fair value through profit or loss, financial guarantee contracts and financial liabilities that arise when a transfer of financial assets does not qualify for derecognition, as financial liabilities carried at amortized cost and present as ‘trade payables and other payables’, ‘borrowings’ and ‘other financial liabilities’ in the statement of financial position. Borrowings are initially recognized as the amount obtained by subtracting the transaction cost incurred from the fair value and is then measured as amortized cost. The difference between the consideration received (net of transaction cost) and the redemption amount is recognized as profit or loss over the period using the effective interest rate method. Fees paid to receive the borrowing limit are recognized as transaction costs for loans to the extent that they are likely to be borrowed as part or all of the borrowing limit. In this case, the fee will be deferred until the draw-down occurs. There is a high possibility that borrowings will be executed as part or all of the borrowing limit agreement (relevant fees to the extent that there is no evidence) are recognized as assets as advance payments for liquidity services and amortized over the relevant borrowing limit period. Preferred shares that require mandatory redemption at a particular date are classified as liabilities. Interest expenses on these preferred shares using the effective interest method are recognized in the statement of profit or loss as ‘finance costs’, together with interest expenses recognized from other financial liabilities. Borrowings are classified as current liabilities unless the Group has an unconditional right to defer settlement of the liability for at least 12 months after the reporting period. (b) Derecognition Financial liabilities are removed from the statement of financial position when it is extinguished; for example, when the obligation specified in the contract is discharged or cancelled or expired or when the terms of an existing financial liability are substantially modified. The difference between the carrying amount of a financial liability extinguished or transferred to another party and the consideration paid (including any non-cash assets transferred or liabilities assumed) is recognized in profit or loss. The Group’s financial liabilities at fair value through profit or loss are financial instruments held for trading and financial liabilities designated as at fair value through profit or loss. A financial liability is held for trading if it is incurred principally for the purpose of repurchasing in the near term. A derivative that is not a designated as hedging instruments and an embedded derivative that is separated are also classified as held for trading. Financial liabilities designed as at fair value through profit or loss are structured financial liabilities containing embedded derivatives issued by the Group.
Financial Guarantee Contracts	2.18 Financial Guarantee Contracts Financial guarantee contracts are recognized as a financial liability at the time the guarantee is issued. The liability is initially measured at fair value, subsequently at the higher of the following amount, and the related liability is recognized as ‘other financial liabilities’ in the consolidated statement of financial position: • the amount determined in accordance with the expected credit loss model under IFRS 9 Financial Instruments • the amount initially recognized less, where appropriate, the cumulative amount of income recognized in accordance with IFRS 15 Revenue from Contracts with Customers
Compound Financial Instruments	2. 1 9 Compound Financial Instruments Compound financial instruments are convertible notes that can be converted into equity instruments at the option of the holder. The liability component of a compound financial instrument is recognized initially at the fair value of a similar liability that does not have an equity conversion option, and subsequently measured at amortized cost until extinguished on conversion or maturity of the bonds. The equity component is recognized initially on the difference between the fair value of the compound financial instrument as a whole and the fair value of the liability component. Any directly attributable transaction costs are allocated to the liability and equity components in proportion to their initial carrying amounts.
Employee Benefits	2.20 Employee Benefits (a) Post-employment benefits The Group operates both defined contribution and defined benefit pension plans. A defined contribution plan is a pension plan under which the Group pays fixed contributions into a separate entity. The contributions are recognized as employee benefit expenses when an employee has rendered service. A defined benefit plan is a pension plan that is not a defined contribution plan. Generally, post-employment benefits are payable after the completion of employment, and the benefit amount depended on the employee’s age, periods of service or salary levels. The liability recognized in the statement of financial position in respect of defined benefit pension plans is the present value of the defined benefit obligation at the end of the reporting period less the fair value of plan assets. The defined benefit obligation is calculated annually by independent actuaries using the projected unit credit method. The present value of the defined benefit obligation is determined by discounting the estimated future cash outflows using interest rates of high-quality corporate bonds that are denominated in the currency in which the benefits will be paid, and that have terms approximating to the terms of the related obligation. Remeasurement gains and losses arising from experience adjustments and changes in actuarial assumptions are recognized in the period in which they occur, directly in other comprehensive income. Changes in the present value of the defined benefit obligation resulting from plan amendments or curtailments are recognized immediately in profit or loss as past service costs. (b) Termination benefits Termination benefits are payable when employment is terminated by the Group before the normal retirement date, or whenever an employee accepts voluntary redundancy in exchange for these benefits. The Group recognizes termination benefits at the earlier of the following dates: when the entity can no longer withdraw the offer of those benefits or when the entity recognizes costs for a restructuring. (c) Long-term employee benefits Certain entities within the Group provide long-term employee benefits that are entitled to employees with service period for ten years and above. The expected costs of these benefits are accrued over the period of employment using the same accounting methodology as used for defined benefit pension plans. The Group recognizes service cost, net interest on other long-term employee benefits and remeasurements as profit or loss for the year. These liabilities are valued annually by an independent qualified actuary.
Share-based payments	2.2 1 Share-Based Payments Equity-settled share-based payment is recognized at fair value of equity instruments granted, and employee benefit expense is recognized over the vesting period. At the end of each period, the Group revises its estimates of the number of options that are expected to vest based on the non-market vesting and service conditions. It recognizes the impact of the revision to original estimates, if any, in profit or loss, with a corresponding adjustment to equity. The acquiree may have outstanding share-based payment transactions that the acquirer does not exchange for its share-based payment transactions. If vested, those acquiree share-based payment transactions are part of the non-controlling interest in the acquiree and are measured at their market-based measure. If unvested, the market-based measure of unvested share-based payment transactions is allocated to the non-controlling interest on the basis of the ratio of the portion of the vesting period completed to the greater of the total vesting period and the original vesting period of the share-based payment transaction. The balance is allocated to post-combination service.
Provisions	2.22 Provisions Provisions for service warranties, recoveries, litigations and claims, and others are recognized when the Group presently hold legal or constructive obligation as a result of past events, and when it is probable that an outflow of resources will be required to settle the obligation and the amount can be reliably estimated. Provisions are measured at the present value of management’s best estimate of the expenditure required to settle the present obligation at the end of the reporting period, and the increase in the provision due to the passage of time is recognized as interest expense.
Leases	2.2 3 Leases (a) Lessee The Group leases various repeater server racks, offices, communication line facilities, machinery, cars, and others. Contracts may contain both lease and non-lease components. The Group allocates the consideration in the contract to the lease and non-lease components based on their relative stand-alone prices. Assets and liabilities arising from a lease are initially measured on a present value basis. Lease liabilities include the net present value of the following lease payments: • Fixed payments (including in-substance fixed payments), less any lease incentives receivable • Variable lease payment that are based on an index or a rate, initially measured using the index or rate as at the commencement date • Amounts expected to be payable by the Group (the lessee) under residual value guarantees • The exercise price of a purchase option if the Group (the lessee) is reasonably certain to exercise that option, and • Payments of penalties for terminating the lease, if the lease term reflects the Group (the lessee) exercising that option Measurement of lease liability also includes payments to be made in optional periods if the lessee is reasonably certain to exercise an option to extend the lease. The Group determines the lease term as the non-cancellable period of a lease, together with both (a) periods covered by an option to extend the lease if the lessee is reasonably certain to exercise that option; and (b) periods covered by an option to terminate the lease if the lessee is reasonably certain not to exercise that option. When the lessee and the lessor each has the right to terminate the lease without permission from the other party, the Group should consider a termination penalty in determining the period for which the contract is enforceable. The lease payments are discounted using the interest rate implicit in the lease. If that rate cannot be determined, the lessee’s incremental borrowing rate is used, which is the rate that the lessee would have to pay to borrow the funds necessary to obtain an asset of similar value in a similar economic environment with similar terms and conditions. The Group is exposed to potential future increases in variable lease payments based on an index or rate, which are not included in the lease liability until they take effect. When adjustments to lease payments based on an index or rate take effect, the lease liability is reassessed and adjusted against the right-of-use asset. Each lease payment is allocated between the liability and finance cost. The finance cost is charged to profit or loss over the lease period in order to produce a constant periodic rate of interest on the remaining balance of the liability for each period. Right-of-use assets are measured at cost comprising the following: • the amount of the initial measurement of lease liability • any lease payments made at or before the commencement date less any lease incentives received • any initial direct costs (leasehold deposits) • restoration costs The right-of-use asset is depreciated over the shorter of the asset’s useful life and the lease term on a straight-line basis. If the Group is reasonably certain to exercise a purchase option, the right-of-use asset is depreciated over the underlying asset’s useful life. Payments associated with short-term leases and leases of low-value assets are recognized on a straight-line basis as an expense in profit or loss. Short-term leases are leases with a lease term of 12 months or less, such as vehicles, machinery, and others. Low-value assets are comprised of tools, office equipment, and others. (b) Lessor Lease income from operating leases where the Group is a lessor is recognized in income on a straight-line basis over the lease term. Initial direct costs incurred in obtaining an operating lease are added to the carrying amount of the underlying asset and recognized as expense over the lease term on the same basis as lease income. The respective leased assets are included in the statement of financial position based on their nature. (c) Extension and termination option Extension and termination options are included in a number of property and equipment leases across the Group. These terms are used to maximize operational flexibility in terms of managing contracts. The majority of extension and termination options held are exercisable only by the Group and not by the respective lessor. Information on critical accounting estimates and assumptions related to the determination of the lease term is presented in Note 3.
Share Capital	2.24 Share Capital The Controlling Company classifies ordinary shares as equity. Where the Controlling Company purchases its own shares, the consideration paid, including any directly attributable incremental costs, is deducted from equity until the share are cancelled or reissued. When these treasury shares are reissued, any consideration received is included in equity attributable to the equity holders of the Controlling Company.
Revenue Recognition	2.25 Revenue Recognition (a) Identifying performance obligations The Group mainly provides telecommunication services and sells handsets. The Group identifies performance obligations with a customer such as providing telecommunication services, selling handsets, and others. Revenue from handsets is recognized when a performance obligation is satisfied by transferring promised goods to customers, and the revenue from telecommunication services is recognized over the estimated contract periods of each services by transferring promised services to customers. (b) Allocation the transaction price and revenue recognition The Group allocates the transaction price to each performance obligation identified in the contract based on a relative stand-alone selling prices of the goods or services being provided to the customer. To allocate the transaction price to each performance obligation on a relative stand-alone price basis, the Group determines the stand-alone selling price at contract inception of the distinct good or service underlying each performance obligation in the contract and allocate the transaction price in proportion to those stand-alone selling price. The stand-alone selling price is the price at which the Group would sell a promised good or service separately to the customer. The best evidence of a stand-alone selling price is the observable price of a good or service when the Group sells that good or service separately in similar circumstances and to similar customers. The Group recognizes the allocated amount as contract assets or contract liabilities, and amortizes it through the remaining period which is adjusted in operating income. (c) Incremental contract acquisition costs The Group pays commission fees when new customers subscribe to telecommunication services. The incremental contract acquisition costs are those commission fees that the Group incurs to acquire a contract with a customer that would not have been incurred if the contract had not been acquired. The Group recognizes the incremental contract acquisition costs as an asset and amortizes it over the expected period of benefit. However, as a practical expedient, the Group may recognize the incremental contract acquisition costs as an expense when it is incurred if the amortization period of the asset is one year or less. (d) Commission fees Commission fees are recognized when it is probable that future economic benefits will flow to the entity and these benefits can be reliably measured. Revenues are measured at the fair value of the consideration received.
Current and Deferred Income Tax	2.26 Current and Deferred Income Tax The tax expense for the period consists of current and deferred tax. Current and deferred tax is recognized in profit or loss, except to the extent that it relates to items recognized in other comprehensive income or directly in equity. In this case, the tax is also recognized in other comprehensive income or directly in equity, respectively. The current income tax expense is measured at the amount expected to be paid to taxation authorities, using the tax rates (and tax laws) that have been enacted or substantively enacted by the end of the reporting period. Management periodically evaluates positions taken in tax returns with respect to situations in which applicable tax regulation is subject to interpretation, and considers whether it is probable that a taxation authority will accept an uncertain tax treatment. The Group measures its tax balances either based on the most likely amount or the expected value, depending on which method provides a better prediction of the resolution of the uncertainty. Deferred income tax is provided in full, using the liability method, on temporary differences arising between the tax bases of assets and liabilities and their carrying amounts in the consolidated financial statements. However, deferred income tax is not accounted for if it arises from initial recognition of an asset or liability in a transaction other than a business combination that at the time of the transaction affects neither accounting profit nor taxable profit or loss. Deferred tax assets are recognized only if it is probable that future taxable amount will be available to utilize those temporary differences and losses. The Group recognizes a deferred tax liability all taxable temporary differences associated with investments in subsidiaries, associates, and interests in joint arrangements, except to the extent that the Group is able to control the timing of the reversal of the temporary difference and it is probable that the temporary difference will not reverse in the foreseeable future. In addition, the Group recognizes a deferred tax asset for all deductible temporary differences arising from such investments to the extent that it is probable the temporary difference will reverse in the foreseeable future and taxable profit will be available against which the temporary difference can be utilized. Deferred tax assets and liabilities are offset when there is a legally enforceable right to offset current tax assets and liabilities and when the deferred tax balances relate to the same taxation authority. Current tax assets and liabilities are offset when the Group has a legally enforceable right to offset and intends either to settle on a net basis, or to realize the assets and settle the liability simultaneously.
Dividend	2.2 7 Dividend Dividend distribution to the Group’s shareholders is recognized as a liability in the financial statements in the period in which the dividends are approved by the Group’s shareholders.
Approval on Issuance of the Consolidated Financial Statements	2.28 Approval on Issuance of the Consolidated Financial Statements The consolidated financial statements of 2023 were approved for issuance by the Board of Directors on April 11, 2024 and are subject to change with the approval of shareholders at their Annual General Meeting.

General Information (Tables)

General Information (Tables)	12 Months Ended
	Dec. 31, 2023
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Summary of Consolidated Subsidiaries	(1) The consolidated subsidiaries as of December 31, 2022 and 2023, are as follows Controlling percentage 1 Subsidiary Type of business Location December 31, December 31, Closing KT Linkus Co., Ltd. Public telephone maintenance Korea 92.4% 92.4% December KT Telecop Co., Ltd. Security service Korea 86.8% 86.8% December KT Alpha Co., Ltd. 5 Data communication Korea 73.0% 73.0% December KT Service Bukbu Co., Ltd Opening services of fixed line Korea 67.3% 67.3% December KT Service Nambu Co., Ltd. Opening services of fixed line Korea 77.3% 77.3% December KT Commerce Inc. B2C, B2B service Korea 100.0% 100.0% December KT Strategic Investment Fund No.3 Investment fund Korea 100.0% 100.0% December KT Strategic Investment Fund No.4 Investment fund Korea 100.0% 100.0% December KT Strategic Investment Fund No.5 Investment fund Korea 100.0% 100.0% December BC-VP Strategic Investment Fund No.1 Investment fund Korea 100.0% 100.0% December BC Card Co., Ltd. Credit card business Korea 69.5% 69.5% December Controlling percentage 1 Subsidiary Type of business Location December 31, December 31, Closing VP Inc. 5 Payment security service for credit card, others Korea 69.7% 72.2% December H&C Network Call center for financial sectors Korea 100.0% 100.0% December BC Card China Co., Ltd. Software development and data processing China 100.0% 100.0% December INITECH Co., Ltd. 5 Internet banking ASP and security solutions Korea 61.3% 63.9% December Smartro Co., Ltd. VAN (Value Added Network) business Korea 64.5% 64.5% December KTDS Co., Ltd. 5 System integration and maintenance Korea 95.6% 91.6% December KT M&S Co., Ltd. PCS distribution Korea 100.0% 100.0% December GENIE Music Corporation 2 Online music production and distribution Korea 36.0% 36.0% December KT MOS Bukbu Co., Ltd. 5 Telecommunication facility maintenance Korea 100.0% 100.0% December KT MOS Nambu Co., Ltd. 5 Telecommunication facility maintenance Korea 98.4% 98.4% December KT Skylife 5 Satellite TV Korea 50.2% 50.6% December Skylife TV Co., Ltd. TV contents provider Korea 100.0% 100.0% December KT Estate Inc. Residential building development and supply Korea 100.0% 100.0% December KT Investment Management Inc. Asset management, real estate and consulting services Korea 100.0% 100.0% December NEXR Co., Ltd. Cloud system implementation Korea 100.0% 100.0% December KTGDH Co., Ltd. Data center development and related service Korea 100.0% 100.0% December KT Sat Co., Ltd. Satellite communication business Korea 100.0% 100.0% December Nasmedia Co., Ltd. 2,5 Solution provider and IPTV advertisement sales business Korea 44.0% 44.1% December KT Sports Co., Ltd. Management of sports teams Korea 100.0% 100.0% December KT Music Contents Fund No.2 Music and contents investment business Korea 100.0% 100.0% December KTCS Corporation 2,5 Database and online information provider Korea 34.1% 34.1% December KTIS Corporation 2,5 Database and online information provider Korea 33.3% 33.3% December KT M Mobile Co., Ltd. Special category telecommunications operator and sales of communication device Korea 100.0% 100.0% December KT Investment Co., Ltd. Financing business for new technology Korea 100.0% 100.0% December PlayD Co., Ltd. Advertising agency Korea 70.4% 70.4% December Next Connect PFV Residential building development and supply Korea 100.0% 100.0% December KT Rwanda Networks Ltd. Network installation and management Rwanda 51.0% 51.0% December AOS Ltd. System integration and maintenance Rwanda 51.0% 51.0% December KT Japan Co., Ltd. Foreign investment business and local counter work Japan 100.0% 100.0% December Controlling percentage 1 Subsidiary Type of business Location December 31, December 31, Closing East Telecom LLC Wireless/fixed line internet business Uzbekistan 91.6% 91.6% December KT America, Inc. Foreign investment business and local counter work USA 100.0% 100.0% December PT. BC Card Asia Pacific Software development and supply Indonesia 99.9% 99.9% December KT Hongkong Telecommunications Co., Ltd. Fixed line telecommunication business Hong Kong 100.0% 100.0% December Korea Telecom Singapore Pte. Ltd. Foreign investment business and local counter work Singapore 100.0% 100.0% December Texnoprosistem LLC Fixed line internet business Uzbekistan 100.0% 100.0% December Nasmedia Thailand Co., Ltd. Internet advertising solution Thailand 99.9% 99.9% December KT Huimangjieum Manufacturing Korea 100.0% 100.0% December K-REALTY RENTAL HOUSING REIT 3 Residential building Korea 88.6% 88.6% December Storywiz Co., Ltd. Contents and software development and supply Korea 100.0% 100.0% December KT Engineering Co., Ltd. Telecommunication facility construction and maintenance Korea 100.0% 100.0% December KT Studio Genie Co., Ltd. Data communication service and data communication construction business Korea 90.9% 90.9% December KHS Corporation Operation and maintenance of facilities Korea 100.0% 100.0% December Lolab Co., Ltd. Truck transportation and trucking arrangement business Korea 79.8% 79.8% December HCN Co., Ltd. Cable television service Korea 100.0% 100.0% December Millie Seojae 2 Book contents service Korea 38.6% 30.2% December KT ES Pte. Ltd. Foreign investment business Singapore 57.6% 57.6% December Epsilon Global Communications PTE. Ltd. Network service industry Singapore 100.0% 100.0% December Epsilon Telecommunications (SP) PTE. Ltd. Fixed line telecommunication business Singapore 100.0% 100.0% December Epsilon Telecommunications (US) PTE. Ltd. Fixed line telecommunication business Singapore 100.0% 100.0% December Epsilon Telecommunications Limited Fixed line telecommunication business UK 100.0% 100.0% December Epsilon Telecommunications (HK) Limited Fixed line telecommunication business Hong Kong 100.0% 100.0% December Epsilon US Inc. Fixed line telecommunication business USA 100.0% 100.0% December Epsilon Telecommunications (BG) EOOD Employee support service Bulgaria 100.0% 100.0% December Nasmedia-KT Alpha Future Growth Strategic Investment Fund Investment fund Korea 100.0% 100.0% December KT Strategic Investment Fund 6 Investment fund Korea 100.0% 100.0% December Altimedia Corporation Software development and delivery Korea 100.0% 100.0% December Altimidia B.V. (formerly Alticast B.V.) Software development and delivery Netherlands 100.0% 100.0% December Controlling percentage 1 Subsidiary Type of business Location December 31, December 31, Closing Altimidia Vietnam (formerly Alticast Company Limited) Software development and delivery Vietnam 100.0% 100.0 December BCCARD VIETNAM LTD. Software sales business Vietnam 100.0% 100.0% December KTP SERVICES INC. Fixed line telecommunication business Philippines 100.0% 100.0% December KT RUS LLC Foreign investment business Russia 100.0% 100.0% December Hangang Real Estate Investment Trust No. 24 Investment fund Korea 75.0% 75.0% December KT DX Vietnam Company Limited Software development Vietnam 100.0% 100.0% December KT Cloud Co., Ltd. Information and communications development Korea 100.0% 92.7% December Pocheon Jeonggyori Development Co., Ltd. Residential building development Korea 80.9% 80.9% December PT CRANIUM ROYAL ADITAMA Software development Indonesia 67.0% 67.0% December Juice Inc. 3,5 Online information provider/Software development and delivery Korea 41.2% 42.6% December open cloud lab Co., Ltd (formerly SPARK AND ASSOCIATES INC.) IT consulting service and Telecommunication equipment sales Korea 100.0% 100.0% December KD Living, Inc. Residential building management Korea —  100.0% December KT HEALTHCARE VINA COMPANY LIMITED Medical service Vietnam —  100.0% December K-Realty Qualified Private Real Estate Investment Trust No. 1 4 Real estate management Korea —  6.5% December AQUA RETAIL VIETNAM COMPANY LIMITED E-voucher issuance and trading business Vietnam —  100.0% December K-Realty Qualified Private Real Estate Investment Trust No. 4 Real estate management Korea —  93.9% December 1 Sum of the interests owned by the Controlling Company and subsidiaries. 2 Although the Controlling Company owns less than 50% interest in Nasmedia, Co., Ltd., KTCS Corporation and KTIS Corporation, Millie Seojae, and GENIE Music Corporation these entities are consolidated as the Controlling Company can exercise the majority of the voting rights in its decision-making process at all times considering voting patterns at previous shareholders’ meetings. 3 Although the Controlling Company owns less than 50 4 Although the Controlling Company owns less than 50% interest in K-Realty Qualified Private Real Estate Investment Trust No. 1, these entities are consolidated by comprehensively considering the criteria for determining control, such as ‘power’, ‘variable profit’, and ‘relationship between power and variable profit’, rather than simply judging by the interests owned by the company. 5 The number of treasury stocks held by subsidiaries are deducted from the total number of shares when calculating the controlling percentage interest. (2) Changes in Scope of Consolidation Subsidiaries newly included and excluded in the consolidation during the year ended December 31, 2023: Changes Location Name of subsidiary Reason Included Korea KD Living, Inc. Transferred 1 Included Vietnam KT HEALTHCARE VINA COMPANY LIMITED Newly established Included Korea K-Realty Qualified Private Real Estate Investment Trust No. 1 Transferred 2 Included Vietnam AQUA RETAIL VIETNAM COMPANY LIMITED Newly established Included Korea K-Realty Qualified Private Real Estate Investment Trust No. 4 Newly established Excluded United Arab Emirates Epsilon M E A General Trading LLC Liquidated Excluded Korea Alpha DX Solution Co., Ltd. Merged Excluded Korea KT Strategic Investment Fund No.2 Liquidated Excluded Korea LS Marine Solution Co., Ltd. (formerly KT Submarine Co., Ltd.) Excluded 3 Excluded Korea KT-Michigan Global Contents Fund Liquidated Excluded Russia KT Primorye IDC LLC Liquidated 1 The entity has been reclassified from a joint venture to a consolidated entity. 2 Although the Controlling Company owns less than 50% interest in K-Realty Qualified Private Real Estate Investment Trust No. 1, these entities are consolidated by comprehensively considering the criteria for determining control, such as ‘power’, ‘variable profit’, and ‘relationship between power and variable profit’, rather than simply judging by the interests owned by the company. 3 Due to the loss of control by the parent company, the entity has been reclassified from a subsidiary to an associate company. (3) Summarized information for consolidated subsidiaries as at and for the years ended December 31, 2021, 2022 and 2023 is as follows (In millions of Korean won) December 31, 2021 3 Total assets Total liabilities Operating 3 Profit (loss) for the year 3 KT Linkus Co., Ltd ￦ 54,219 ￦ 53,316 ￦ 81,434 ￦ (3,095 ) KT Submarine Co., Ltd. 110,390 10,736 31,374 (3,183 ) KT Telecop Co., Ltd. 363,224 233,797 515,456 3,985 KT Alpha Co., Ltd. (KT Hitel Co., Ltd.) 390,671 172,767 471,870 (8,692 ) KT Service Bukbu Inc. 59,341 54,070 231,602 1,128 KT Service Nambu Inc. 62,513 52,695 271,174 1,430 BC Card Co., Ltd. 1 3,933,427 2,481,004 3,580,970 120,308 H&C Network Co., Ltd. 1 88,616 4,993 227,604 11,995 Nasmedia Co., Ltd. 1 490,394 268,618 125,876 27,120 KTDS Co., Ltd. 1 341,358 199,831 632,899 21,464 KT M&S Co., Ltd. 241,377 203,051 710,634 3,496 KT MOS Bukbu Co., Ltd. 32,511 25,402 70,212 1,637 KT MOS Nambu Co., Ltd. 36,741 26,053 71,940 2,016 KT Skylife Co., Ltd. 1 1,275,645 469,694 772,950 62,309 KT Estate Inc. 1 2,370,940 791,884 577,578 213,203 KTGDH Co., Ltd. 11,464 1,560 4,423 553 KT Sat Inc. 593,616 34,169 174,750 20,830 KT Sports Inc. 29,524 19,740 67,612 (2,039 ) KT Music Contents Fund No.2 14,985 278 253 (30 ) KT-Michigan Global Contents Fund 3,552 112 13,592 10,032 KT M Mobile Inc. 144,175 40,749 204,641 5,918 KT Investment Co., Ltd. 1 87,366 66,108 21,040 (697 ) KTCS Corporation 1 416,750 234,172 968,499 19,034 KTIS Corporation 369,361 177,619 487,801 24,944 Next Connect PFV Inc. 518,441 167,963 —  (6,519 ) KT Japan Co., Ltd. 1 1,474 2,633 1,298 (142 ) KT America, Inc. 4,884 101 6,508 201 KT Rwanda Networks Ltd. 2 125,860 236,389 23,328 (28,770 ) AOS Ltd. 2 11,539 2,812 6,942 823 KT Hong Kong Telecommunications Co., Ltd. 6,613 1,346 18,825 1,313 KT Hopemate 1 6,311 2,978 12,538 116 KT Engineering Co., Ltd. (KT ENGCORE Co., Ltd.) 185,850 144,832 284,998 366 KT Studio Genie Co., Ltd. 1, 648,534 276,933 90,047 (16,443 ) Lolab Co., Ltd. 26,726 897 2,107 (134 ) East Telecom LLC 1 35,904 22,088 11,960 2,487 KT ES Pte. Ltd. 1 240,331 80,597 15,157 (6,355 ) KT Philippines 3,641 1,243 —  —  Altimedia Corporation 1 32,338 9,742 6,968 1,037 1 These companies are the intermediate controlling companies of other subsidiaries and the above financial information is from their consolidated financial statements. 2 Convertible preferred stock issued by subsidiaries as of the end of the reporting period is included in liabilities. 3 Profit or loss is included from the date of acquisition of control to the end of the reporting period. (in millions of Korean won) December 31, 2022 3 Total assets Total liabilities Operating 3 Profit (loss) for the year 3 KT Linkus Co., Ltd. ￦ 47,734 ￦ 47,498 ￦ 76,135 ￦ (614 ) KT Submarine Co., Ltd. 120,255 7,884 42,848 (12,126 ) KT Telecop Co., Ltd. 370,004 230,965 517,406 4,267 KT Alpha Co., Ltd 1 (KT Hitel Co., Ltd.) 406,236 172,211 516,737 13,115 KT Service Bukbu Co., Ltd. 74,673 65,820 252,304 3,227 KT Service Nambu Co., Ltd. 80,450 66,479 301,720 3,067 BC Card Co., Ltd. 1 5,666,075 4,109,200 3,897,090 148,341 H&C Network 82,737 6,640 27,392 992 Nasmedia Co., Ltd. 1 516,945 275,730 153,210 27,691 KTDS Co., Ltd. 1 401,932 228,474 723,161 30,941 KT M&S Co., Ltd. 255,310 204,336 730,802 8,105 KT MOS Bukbu Co., Ltd. 38,684 22,553 83,085 4,607 KT MOS Nambu Co., Ltd. 42,011 25,416 83,330 5,035 KT Skylife Co., Ltd. 1 1,359,166 503,679 1,038,468 20,941 KT Estate Inc. 1 2,480,333 833,842 478,188 58,780 KT GDH Co., Ltd. 12,059 1,596 4,323 451 KT Sat Co., Ltd. 677,980 89,644 185,313 28,073 KT Sports Co., Ltd. 28,220 15,461 65,350 (7,302 ) KT Music Contents Fund No.2 15,718 277 1,040 735 KT-Michigan Global Content Fund 2,371 27 33 (1,095 ) KT M Mobile Co., Ltd. 152,114 49,816 262,918 4,731 KT Investment Co., Ltd. 1 103,354 79,182 15,136 2,840 KTCS Corporation 1 419,726 228,618 1,031,010 17,634 KTIS Corporation 396,208 199,204 536,229 15,917 Next Connect PFV 624,734 277,967 3 (3,712 ) KT Japan Co., Ltd. 1 1,888 3,141 3,263 226 KT America, Inc. 5,945 843 8,070 37 KT Rwanda Networks Ltd. 2 126,721 267,369 30,834 (27,467 ) AOS Ltd. 2 10,972 905 8,049 1,274 KT Hong Kong Telecommunications Co., Ltd. 10,505 4,768 20,413 51 KT Huimangjieum 1 6,984 2,582 22,860 494 KT Engineering Co., Ltd. (KT ENGCORE Co., Ltd.) 141,463 89,853 258,435 10,302 KT Studio Genie Co., Ltd. 1 987,270 268,911 723,580 189,498 Lolab Co., Ltd. 35,091 17,247 74,881 (7,985 ) East Telecom LLC 1 42,691 21,645 27,030 6,419 KT ES Pte. Ltd. 1 240,721 88,640 78,815 (23,957 ) KTP SERVICES INC. 3,832 2,044 776 (255 ) Altimedia Corporation 1 44,861 15,777 47,203 6,035 KT RUS LLC 1 967 16 5 (871 ) KT DX Vietnam Company Limited 1,815 6 —  26 kt cloud Co., Ltd. 1 1,348,684 245,872 432,118 14,712 1 These companies are the intermediate controlling companies of other subsidiaries and the above financial information is from their consolidated financial statements. 2 Convertible preferred stock issued by subsidiaries as of the end of the reporting period is included in liabilities. 3 Profit or loss is included from the date of acquisition of control to the end of the reporting period. (in millions of Korean won) December 31, 2023 3 Total assets Total liabilities Operating Profit (loss) for the year KT Linkus Co., Ltd. ￦ 64,178 ￦ 63,452 ￦ 81,645 ￦ 821 KT Telecop Co., Ltd. 375,596        235,947 527,015 5,728 KT Alpha Co., Ltd. 443,639 191,254 437,308   19,352 KT Service Bukbu Co., Ltd. 63,760 55,360 242,119 1,212 KT Service Nambu Co., Ltd. 71,576 58,745 291,170 1,354 BC Card Co., Ltd. 1    6,352,878 4,722,432 4,027,450 76,545 H&C Network 81,107 4,863 27,205 1,814 Nasmedia Co., Ltd. 1 513,311 262,336 147,934 17,703 KTDS Co., Ltd. 1 393,667 202,067     727,477 33,971 KT M&S Co., Ltd. 258,477 209,075 695,856 3,783 KT MOS Bukbu Co., Ltd. 50,750 28,431 101,428 8,457 KT MOS Nambu Co., Ltd. 46,839 26,012 101,422 5,749 KT Skylife Co., Ltd. 1 1,220,842 479,369 1,034,342 (109,407 ) KT Estate Inc. 1 2,746,546 1,121,970 511,018 871 KT GDH Co., Ltd. 7,760 1,501 4,346 648 KT Sat Co., Ltd. 699,607 88,524 182,274    30,502 KT Sports Co., Ltd. 26,615 11,299 66,309 (12,386 ) KT Music Contents Fund No.2 5,558 1,772 534 (992 ) KT M Mobile Co., Ltd. 176,838 69,317 301,049 5,605 KT Investment Co., Ltd. 1 83,638 57,420 24,976 2,180 KTCS Corporation 1 434,900 234,850 1,035,911 15,804 KTIS Corporation 447,609 243,519 593,162 13,922 Next Connect PFV 946,687 629,809 —  (29,889 ) KT Japan Co., Ltd. 1 2,015 3,341 2,793 (110 ) KT America, Inc. 6,013 701 8,928 133 KT Rwanda Networks Ltd. 2 134,847 313,787 26,788 (57,628 ) AOS Ltd. 2 10,763 1,983 8,287 128 KT Hong Kong Telecommunications Co., Ltd. 11,142 5,121 19,373 143 KT Huimangjieum 1 8,073 2,715 17,687 1,012 KT Engineering Co., Ltd. 160,243    104,005   262,063 5,327 KT Studio Genie Co., Ltd. 1 989,187      259,413      542,955   13,507 Lolab Co., Ltd. 42,744 37,838 173,035 (12,938 ) East Telecom LLC 1 48,483 22,632 30,350 7,723 KT ES Pte. Ltd. 1 117,009 90,392 87,865 (124,850 ) KTP SERVICES INC. 2,967 919 671 235 Altimedia Corporation 1 48,381 12,374 45,035 7,352 KT RUS LLC 501 10 1 (378 ) KT DX Vietnam Company Limited 1,694 102 82 (207 ) KT Cloud Co., Ltd. 1    1,983,972    503,241   679,825    63,956 KT Healthcare Vina Co., Ltd. 12,730 439 —  (721 ) K-Realty Qualified Private Real Estate Investment Trust No. 1 80,266 50,693 4,682 (1,037 ) AQUA RETAIL VIETNAM COMPANY LIMITED 1,202 62 16 (248 ) 1 These companies are the intermediate controlling companies of other subsidiaries and the above financial information is from their consolidated financial statements. 2 Convertible preferred stock issued by subsidiaries as of the end of the reporting period is included in liabilities. 3 Profit or loss is included from the date of acquisition of control to the end of the reporting period.

Material Accounting Policies (T

Material Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2023
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Summary of Estimated Useful Lives of Property, Plant and Equipment	Depreciation of all property and equipment, except for land, is calculated using the straight-line method to allocate their cost, net of their residual values, over their estimated useful lives as follows: Useful Life Buildings 5 – 40 years Structures 5 – 40 years Machinery and equipment (Telecommunications equipment and others) 2 – 40 years Vehicles 4 – 10 years Tools 2 – 6 years Office equipment 2 – 8 years
Summary of Amortization of Intangible Assets With Limited Useful Life	The Group amortizes intangible assets with a limited useful life using the straight-line method over the following periods: Useful Life Development costs 3 – 10 years  Software 3 – 10 years  Frequency usage rights 5 – 10 years  Others 1 1 – 50 years  1 Membership rights (condominium membership and golf membership), subscription rights, broadcast license, facility usage rights and transportation license included in others are classified as intangible assets with indefinite useful life.

Financial Instruments by Cate_2

Financial Instruments by Category (Tables)	12 Months Ended
	Dec. 31, 2023
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Summary of Financial Instruments by Category	(1) Financial instruments by category as o (in millions of Korean won) December 31, 2022 Financial assets Financial Financial Financial Derivatives used for Total Cash and cash equivalents ￦ 2,449,062 ￦ —  ￦ —  ￦ —  ￦ 2,449,062 Trade and other receivables 7,459,994 —  129,124 —  7,589,118 Other financial assets 1,060,058 1,064,856 1,508,192 190,830 3,823,936 (in millions of Korean won) December 31, 2022 Financial liabilities Financial cost Financial profit and Derivatives used for Others Total Trade and other payables 1 ￦ 8,397,264 ￦ —  ￦ —  ￦ —  ￦ 8,397,264 Borrowings 10,006,685 —  —  —  10,006,685 Other financial liabilities 246,606 141,280 33,555 —  421,441 Lease liabilities —  —  —  1,172,038 1,172,038 1 Amounts related to employee benefit plans are included in Trade and other payables. (in millions of Korean won) December 31, 2023 Financial assets Financial Financial Financial Derivatives used for Total Cash and cash equivalents ￦ 2,879,554 ￦ —  ￦ —  ￦ —  ￦ 2,879,554 Trade and other receivables 8,458,259 —  116,198 —  8,574,457 Other financial assets 1,385,921 939,661 1,680,168 159,211 4,164,961 (in millions of Korean won) December 31, 2023 Financial liabilities Financial cost Financial profit and Derivatives used for Others Total Trade and other payables ￦ 8,317,822 ￦ —  ￦ —  ￦ —  ￦ 8,317,822 Borrowings 10,218,165 —  —  —  10,218,165 Other financial liabilities 915,185 136,106 24,547 —  1,075,838 Lease liabilities —  —  —  1,179,909 1,179,909
Summary of Gains or Losses Arising From Financial Instruments by Category	(2) Gains or l o (in millions of Korean won) 2021 2022 2023 Financial assets at amortized cost Interest income 1 ￦ 74,937 ￦ 144,505 ￦ 360,134 Gain on foreign currency transactions 4 12,826 23,824 22,782 Gain (loss) on foreign currency translation 2,911 (2,151 ) 5,741 Gain (loss) on disposal 35 (81 ) (3,409 ) Loss on valuation (110,286 ) (132,102 ) (172,966 ) Financial assets at fair value through profit or loss Interest income 1 3,673 6,008 13,480 Dividend income 5 21,499 4,600 6,918 Gain (loss) on valuation 6 64,659 (29,282 ) (31,965 ) Gain on disposal 29,974 2,347 14,237 Gain on foreign currency transactions 4 —  1,100 —  Gain on foreign currency translation 17,794 13,711 3,396 Financial assets at fair value through other comprehensive income Interest income 1 222,290 190,281 18,966 Dividend income 5 1,365 9,522 52,813 Loss on valuation —  (61 ) —  Loss on disposal (22,712 ) (62,183 ) (11,193 ) Other comprehensive income (loss) for the year 2 129,780 (158,574 ) 121,805 Derivatives used for hedging Gain on transactions —  27,628 10,192 Gain on valuation 7 203,961 150,699 34,092 Other comprehensive income for the year 2 144,967 88,048 7,772 (in millions of Korean won) 2021 2022 2023 Reclassified to profit or loss from other comprehensive gain (loss) for the year 2,3 (143,305 ) (110,616 ) (29,178 ) Financial liabilities at amortized cost Interest expense 1 (232,197 ) (275,302 ) (358,486 ) Gain on valuation 8 —  —  3,411 Loss on foreign currency transactions 4 (3,580 ) (34,574 ) (24,054 ) Loss on foreign currency translation (201,623 ) (168,577 ) (93,004 ) Financial liabilities at fair value through profit or loss Gain (loss) on valuation 42,447 30,031 (7,394 ) Gain on disposal Interest expense 1 2,136 —  —  (4,046 ) 4,788 (44 ) Gain (loss) on foreign currency transactions 4 (2 ) 24 (5 ) Derivatives used for hedging Loss on transactions (6,208 ) (1,291 ) —  Gain (loss) on valuation (7,206 ) (17,237 ) 11,503 Other comprehensive income (loss) for the year 2 (3,112 ) (23,957 ) 7,557 Reclassified to profit or loss from other comprehensive income for the year 2,3 6,722 15,195 (8,764 ) Lease liabilities Interest expense 1 (36,650 ) (41,469 ) (52,035 ) Total ￦ 215,095 ￦ (353,980 ) ￦ (92,910 ) 1 BC Card Co., Ltd., etc., subsidiaries of the Group, recognized interest income and expenses as operating revenue and expenses, respectively. Related interest income recognized as operating revenue is ￦ ￦ ￦ ￦ ￦ ￦ 2 The amounts directly reflected in equity after adjustments of deferred income tax. 3 During the years ended December 31, 2022 and 2023, certain derivatives of the Group were settled and the related gain or loss on valuation of cash flow hedge in other comprehensive income was reclassified to profit or loss for the year. 4 BC Card Co., Ltd., a subsidiary of the Group, recognized foreign currency transaction gain and loss and as operating revenue and expense. In relation to this, foreign currency transaction gain and loss recognized as operating revenue and expense amount to foreign exchange gain ￦ ￦ ￦ 5 BC Card Co., Ltd., a subsidiary of the Group, recognized dividend income as operating revenue. Related dividend income recognized as operating revenue is ￦ ￦ ￦ 6 KT Investment Co., Ltd., etc., subsidiaries of the Group, recognized gain and loss on valuation of financial instruments measured at fair value through profit or loss as operating income and expenses. In relation to this, valuation gain and loss recognized as operating revenue and expense amount to valuation loss ￦ ￦ ￦ 7 BC Card Co., Ltd., a subsidiary of the Group, recognized gain and loss on valuation of derivatives as operating income and expenses. Related valuation gain recognized as operating revenue and expense is ￦ ￦ 8 KT Cloud Co., Ltd., a subsidiary of the Group, recognized gain on valuation as convertible preferred stock of ￦

Cash and Cash Equivalents (Tabl

Cash and Cash Equivalents (Tables)	12 Months Ended
	Dec. 31, 2023
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Summary of Restricted Cash and Cash Equivalents	Restricted cash and cash equivalents as of December 31, 2022 and 2023, are as follows: (in millions of Korean won) December 31, December 31, Description Bank deposits ￦ ￦ Deposit restricted for government project and others

Trade and Other Receivables (Ta

Trade and Other Receivables (Tables)	12 Months Ended
	Dec. 31, 2023
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Summary of Trade and Other Receivables	(1) Trade and other receivables as of December 31, 2022 and 2023, are as follows: December 31, 2022 (in millions of Korean won) Total Provision Present value Carrying amount Current assets Trade receivables ￦ 3,439,542 ￦ (342,539 ) ￦ (6,926 ) ￦ 3,090,077 Other receivables 3,092,261 (82,243 ) (2,023 ) 3,007,995 Total ￦ 6,531,803 ￦ (424,782 ) ￦ (8,949 ) ￦ 6,098,072 Non-current assets Trade receivables ￦ 408,098 ￦ (1,199 ) ￦ (11,540 ) ￦ 395,359 Other receivables 1,249,096 (136,300 ) (17,109 ) 1,095,687 Total ￦ 1,657,194 ￦ (137,499 ) ￦ (28,649 ) ￦ 1,491,046 December 31, 2023 (in millions of Korean won) Total Provision Present value Carrying amount Current assets Trade receivables ￦ 3,596,899 ￦ (330,002 ) ￦ (9,165 ) ￦ 3,257,732 Other receivables 3,990,900 (76,089 ) (2,254 ) 3,912,557 Total ￦ 7,587,799 ￦ (406,091 ) ￦ (11,419 ) ￦ 7,170,289 Non-current assets Trade receivables ￦ 318,429 ￦ (1,288 ) ￦ (19,476 ) ￦ 297,665 Other receivables 1,227,929 (107,547 ) (13,879 ) 1,106,503 Total ￦ 1,546,358 ￦ (108,835 ) ￦ (33,355 ) ￦ 1,404,168 (2) The fair values of trade and other receivables with original maturities less than one year are equal to their carrying amounts because the discounting effect is immaterial. The fair value of trade and other receivables with original maturities longer than one year, which are mainly from sales of goods, is determined by discounting the expected future cash flow at the weighted average interest rate.
Summary of Changes in Provision for Impairment	(3) Details of changes in provision for impairment for the years ended December 31, 2022 and 2023, are as follows: 2022 2023 (in millions of Korean won) Trade Other Trade Other receivables Beginning balance ￦ 349,725 ￦ 201,387 ￦ 343,738 ￦ 218,543 Provision 64,522 65,941 69,972 114,501 Reversal —  (850 ) —  (14,941 ) Write-off/transfer (69,430 ) (49,904 ) (69,246 ) (129,108 ) Acquisition and disposition of businesses (43 ) —  (310 ) (17 ) Others (1,036 ) 1,969 (12,864 ) (5,342 ) Ending balance ￦ 343,738 ￦ 218,543 ￦ 331,290 ￦ 183,636
Summary of Other Receivables	(4) Details of other receivables as of December 31, 2022 and 2023, are as follows: (in millions of Korean won) December 31, December 31, Loans ￦ 98,953 ￦ 51,854 Receivables 1 2,668,545 3,539,742 Accrued income 32,218 43,920 Refundable deposits 339,450 299,935 Loans receivable 1,013,428 1,067,005 Finance lease receivables 105,690 141,883 Others 63,941 58,357 Less: Provision for impairment (218,543 ) (183,636 ) ￦ 4,103,682 ￦ 5,019,060 1 As of December 31, 2023, credit sales asset of ￦ ￦

Other Financial Assets and Li_2

Other Financial Assets and Liabilities (Tables)	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
Summary of Other Financial Assets and Liabilities	(1) Details of other financial assets and liabilities as of December 31, 2022 and 2023, are as follows: (in millions of Korean won) December 31, 2022 December 31, 2023 Other financial assets Financial assets at amortized cost 1 ￦ 1,060,058 ￦ 1,385,921 Financial assets at fair value through profit or loss 1,2 1,064,856 939,661 Financial assets at fair value through other comprehensive income 1,508,192 1,680,168 Derivatives used for hedging 190,830 159,211 Less: Non-current (2,501,484 ) (2,724,761 ) Current ￦ 1,322,452 ￦ 1,440,200 Other financial liabilities Financial liabilities at amortized cost 3 ￦ 246,606 ￦ 915,185 Financial liabilities at fair value through profit or loss 141,280 136,106 Derivatives used for hedging 33,555 24,547 Less: Non-current (412,650 ) (753,739 ) Current ￦ 8,791 ￦ 322,099 1 As of December 31, 2023, the Group’s other financial assets amounting to ￦ ￦ 2 As of December 31, 2023, the Group provided investments in Korea Software Financial Cooperative amounting to ￦ 3 The amount includes liabilities related to the obligation to acquire additional shares in Epsilon Global Communications Pte. Ltd. and MILLIE Co., Ltd and KT Cloud Co., Ltd. (Note 19).
Summary of Financial Assets at Fair Value Through Profit or Loss	1) Details of financial assets at fair value through profit or loss as of December 31, 2022 and 2023, are as follows: (in millions of Korean won) December 31, 2022 December 31, 2023 Equity Instruments (Listed) ￦ 26,647 ￦ 13,911 Equity Instruments (Unlisted) 72,517 42,185 Debt securities 942,274 880,549 Derivatives held for trading 1 23,418 3,016 Total 1,064,856 939,661 Less: non-current (609,887 ) (782,143 ) Current ￦ 454,969 ￦ 157,518 1 According to a derivative arrangement with LS Marine Solution Co., Ltd. (formerly KT Submarine Co., Ltd.), derivative assets amounting to ￦
Summary of Financial Assets at Fair Value Through Other Comprehensive Income	1) Details of financial assets at fair value through other comprehensive income as of December 31, 2022 and 2023, are as follows: (in millions of Korean won) December 31, 2022 December 31, 2023 Equity Instruments (Listed) ￦ 1,006,476 ￦ 1,231,188 Equity Instruments (Unlisted) 496,284 443,067 Debt securities 5,432 5,913 Total 1,508,192 1,680,168 Less: non-current (1,508,192 ) (1,680,168 ) Current ￦ —  ￦ —
Summary of Derivative Financial Assets and Liabilities	1) Details of valu a December 31, 2022 December 31, 2023 (in millions of Korean won) Assets Liabilities Assets Liabilities Interest rate swap ￦ 4,236 ￦ — ￦ 1,530 ￦ 191 Currency swap 1 186,594 33,555 157,681 24,356 Total 190,830 33,555 159,211 24,547 Less: non-current (147,141 ) (33,555 ) (107,802 ) (23,696 ) Current ￦ 43,689 ￦ — ￦ 51,409 ￦ 851 1 The currency swap contract is to hedge the risk of variability in cash flow from the borrowings due to changes in interest rate and foreign exchange rate and the expected maximum period for the Group to be exposed to risks of cash flow fluctuation by hedged items is until September 7, 2034.
Summary of Valuation Gains and Losses on Derivatives Contracts	2) The valuation gains and losses on the derivatives contracts for the years ended December 31, 2021, 2022 and 2023, are as follows: (in millions of 2021 2022 2023 Type of Valuation gain Valuation loss Other comprehensive income 1 Valuation gain Valuation loss Other comprehensive income 1 Valuation gain Valuation Loss Other comprehensive income 1 Interest rate swap ￦ —  ￦ —  ￦ 1 ￦ 63 ￦ 490 ￦ 4,666 ￦ 48 ￦ —  ￦ (2,945 ) Currency swap 203,961 7,206 191,569 154,611 20,723 79,781 45,709 162 (27,273 ) Currency forwards —  —  —  —  —  754 — — — Total ￦ 203,961 ￦ 7,206 ￦ 191,570 ￦ 154,674 ￦ 21,213 ￦ 85,201 ￦ 45,757 ￦ 162 ￦ (30,218 ) 1 The amounts directly reflected in equity are before adjustments of deferred income tax and allocation to the non-controlling interest.
Summary of Hedging instruments	(i) Hedging instruments (in millions of Korean won and thousands of foreign currencies) 2022 Book value of hedging Changes in fair Currency Foreign Contract Assets Liabilities USD 2,111,509 ￦ 2,527,626 ￦ 160,243 ￦ 32,936 ￦ 170,856 JPY 400,000 4,357 —  409 (308 ) SGD 284,000 245,208 26,351 —  20,511 EUR 7,700 10,283 —  210 129 KRW —  170,000 4,236 —  4,717 Total     ￦ 2,957,474 ￦ 190,830 ￦ 33,555 ￦ 195,905 (in millions of Korean won 2023 Book value of hedging Changes in fair Currency Foreign Contract Assets Liabilities USD 2,011,509 ￦ 2,417,473 ￦ 157,681 ￦ 23,465 ￦ 44,413 JPY 400,000 4,357 —  660 (162 ) EUR 7,700 10,283 —  231 381 KRW —  240,000 1,530 191 707 Total —  ￦ 2,672,113 ￦ 159,211 ￦ 24,547 ￦ 45,339
Summary of Hedged items	(ii) Hedged item (in millions of Korean won) 2022 2023 Currency Book value Changes in fair Cash flow 1 Book value Changes in fair Cash flow 1 USD ￦ 2,675,885 ￦ (170,010 ) ￦ (13,947 ) ￦ 2,593,707 ￦ (44,365 ) ￦ (30,415 ) JPY 3,813 308 116 3,651 162 49 SGD 267,843 (18,720 ) 3,406 —  —  —  EUR 10,404 (121 ) 582 10,985 (581 ) 158 KRW 101,035 (4,655 ) 4,385 239,944 (596 ) 1,315 Total ￦ 3,058,980 ￦ (193,198 ) ￦ (5,458 ) ￦ 2,848,287 ￦ (45,380 ) ￦ (28,893 ) 1 The amount is after the deferred tax directly added or subtracted to the capital is reflected.
Summary of Financial Liabilities at Fair Value Through Profit or Loss	1) Details of financial liabilities at fair value through profit or loss as of December 31, 2022 and 2023, are as follows: (in millions of Korean won) December 31, 2022 December 31, 2023 Derivatives held for trading 1,2 ￦ 141,280 ￦ 136,106 1 In relation to the additional acquisition of shares of the equity method investee K Bank Inc in 2021, the Group has entered into a shareholder agreement with the shareholders of K Bank Inc. According to the shareholder agreement, if K Bank Inc fails to be listed on the terms agreed in the shareholder agreement, the shareholders of K Bank Inc may exercise their Drag-Along right to the Group and require the Group to sell all the shares owned by such shareholders in K Bank to third parties based on the guaranteed return agreed in the shareholder agreement. The shareholder agreement also includes a call option where, if the shareholders exercise their Drag-Along rights, the Group has an option to purchase the shares held by those shareholders. As of December 31, 2023, the derivative financial liability in accordance with IFRS 9 associated with the rights prescribed in the shareholders agreement was ￦ ￦ 2 The amount includes derivatives separated from convertible bonds issued by the Group (Note 15).
Summary of Valuation Gain and Loss on Financial Liabilities at Fair Value Through Profit or Loss	2) The valuation gain and loss on financial liabilities at fair value through profit or loss for the years ended December 31, 2021, 2022 and 2023, are as follows: 2021 2022 2023 (in millions of Korean won) Valuation gain Valuation loss Valuation gain Valuation loss Valuation gain Valuation loss Derivatives liabilities held for trading ￦ 51,187 ￦ 8,741 ￦ 24,683 ￦ 1,800 ￦ 3,316 ￦ 10,710

Inventories (Tables)

Inventories (Tables)	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
Summary of Inventories Net	Inventories as at December 31, 2022 and 2023, are as follows: December 31, 2022 December 31, 2023 (in millions of Korean won) Acquisition Valuation Book amount Acquisition cost Valuation Allowance Book amount Merchandise ￦ 768,748 ￦ (96,010 ) ￦ 672,738 ￦ 981,127 ￦ (102,215 ) ￦ 878,912 Others 44,935 —  44,935 109,439 —  109,439 Total ￦ 813,683 ￦ (96,010 ) ￦ 717,673 ￦ 1,090,566 ￦ (102,215 ) ￦ 988,351

Other Assets and Liabilities (T

Other Assets and Liabilities (Tables)	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
Summary of Other Assets and Liabilities	Other assets and liabilities as at December 31, 2022 and 2023, are as follows: (in millions of Korean won) December 31, 2022 December 31, 2023 Other assets Advance payments ￦ 181,150 ￦ 217,997 Prepaid expenses 107,775 146,628 Contract cost 1,817,678 1,727,468 Contract assets 802,253 832,520 Others 12,964 15,237 Less: Non-current (820,608 ) (827,297 ) Current ￦ 2,101,212 ￦ 2,112,553 Other liabilities Advances received 1 ￦ 387,986 ￦ 682,880 Withholdings 155,017 159,080 Unearned revenue 1 46,493 27,392 Lease liabilities 1,172,038 1,179,909 Contract liabilities 284,107 278,749 Others 33,108 30,848 Less: Non-current (945,731 ) (950,015 ) Current ￦ 1,133,018 ￦ 1,408,843 1 The amounts include adjustments arising from adoption of IFRS 15 Revenue from Contracts with Customers

Property and Equipment (Tables)

Property and Equipment (Tables)	12 Months Ended
	Dec. 31, 2023
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Summary of Changes in Property and Equipment	(1) Changes in property and equipment for the years ended December 31, 2022 and 2023, are as follows: 2022 (in millions of Korean won) Land Buildings Machinery Others Construction- Total Acquisition cost ￦ 1,315,929 ￦ 4,707,250 ￦ 40,270,005 ￦ 1,607,853 ￦ 1,094,479 ￦ 48,995,516 Less: Accumulated depreciation (including accumulated impairment loss and others) (132 ) (2,189,828 ) (30,953,434 ) (1,386,615 ) (621 ) (34,530,630 ) Beginning, net 1,315,797 2,517,422 9,316,571 221,238 1,093,858 14,464,886 Acquisition and capital expenditure 11,392 32,030 129,754 67,921 3,105,283 3,346,380 Disposal and termination (2,556 ) (4,338 ) (76,608 ) (4,695 ) (3,926 ) (92,123 ) Depreciation —  (147,620 ) (2,413,191 ) (79,376 ) —  (2,640,187 ) Impairment —  —  (6,084 ) (7,825 ) (2,247 ) (16,156 ) Transfer in (out) 1 24,647 230,955 2,660,753 31,036 (3,010,193 ) (62,802 ) Transfer from (to) investment properties (63,278 ) (140,229 ) —  —  (2,676 ) (206,183 ) Acquisition and disposition of businesses —  —  (4,386 ) (481 ) (3,720 ) (8,587 ) Others (13,194 ) 66,341 7,020 (4,382 ) (68,834 ) (13,049 ) Ending, net ￦ 1,272,808 ￦ 2,554,561 ￦ 9,613,829 ￦ 223,436 ￦ 1,107,545 ￦ 14,772,179 Acquisition cost ￦ 1,272,940 ￦ 4,830,853 ￦ 42,091,573 ￦ 1,276,779 ￦ 1,108,043 ￦ 50,580,188 Less: Accumulated depreciation (including accumulated impairment loss and others) (132 ) (2,276,292 ) (32,477,744 ) (1,053,343 ) (498 ) (35,808,009 ) 1 The amounts include the transferred amount to Intangible Assets account. 2023 (in millions of Korean won) Land Buildings and structures Machinery Others Construction- Total Acquisition cost ￦ 1,272,940 ￦ 4,830,853 ￦ 42,091,573 ￦ 1,276,779 ￦ 1,108,043 ￦ 50,580,188 Less: Accumulated depreciation (including accumulated impairment loss and others) (132 ) (2,276,292 ) (32,477,744 ) (1,053,343 ) (498 ) (35,808,009 ) Beginning, net 1,272,808 2,554,561 9,613,829 223,436 1,107,545 14,772,179 Acquisition and capital expenditure 844 5,072 75,412 78,400 3,029,380 3,189,108 Disposal and termination (3,651 ) (5,012 ) (70,418 ) (1,711 ) (327 ) (81,119 ) Depreciation —  (148,981 ) (2,495,402 ) (75,900 ) —  (2,720,283 ) Impairment —  —  (6,577 ) (1 ) (1,294 ) (7,872 ) Transfer in (out) 1 58,790 151,157 2,706,444 16,407 (3,092,670 ) (159,872 ) Transfer from (to) investment properties (37,725 ) (88,336 ) —  —  (189 ) (126,250 ) Acquisition and disposition of businesses 18,761 49,532 (14,981 ) (44,543 ) (3,205 ) 5,564 Others 14,549 137 (1,628 ) (7,742 ) (4,692 ) 624 Ending, net ￦ 1,324,376 ￦ 2,518,130 ￦ 9,806,679 ￦ 188,346 ￦ 1,034,548 ￦ 14,872,079 Acquisition cost ￦ 1,324,508 ￦ 4,903,073 ￦ 43,611,280 ￦ 1,182,144 ￦ 1,035,198 ￦ 52,056,203 Less: Accumulated depreciation (including accumulated impairment loss and others) (132 ) (2,384,943 ) (33,804,601 ) (993,798 ) (650 ) (37,184,124 ) 1 The amounts include the transferred amount to Intangible Assets account.
Summary of the Details of Property and Equipment and Investment Properties Provided	(2) Details of property and equipment and investment properties provided as collateral as of December 31, 2022 and 2023, are as follows: (in millions of Korean won) December 31, 2022 Carrying Secured Related line Related Secured party Land and Buildings ￦ 13,899 ￦ 19,100 Borrowings ￦ 6,000 Industrial Land and Buildings ￦ 460,166 ￦ 61,733 Deposits ￦ 52,662 Lessee (in millions of Korean won) December 31, 2023 Carrying Secured Related line Related Secured party Land and Buildings ￦ 81,057 ￦ 64,680 Borrowings ￦ 54,900 Industrial Land and Buildings ￦ 555,921 ￦ 64,877 Deposits ￦ 55,965 Lessee

Investment Properties (Tables)

Investment Properties (Tables)	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
Summary of Investment Properties	(1) Changes in investment properties for the years ended December 31, 2022 and 2023, are as follows: 2022 (in millions of Korean won) Land Buildings Construction- in-progress Total Acquisition cost ￦ 815,331 ￦ 1,424,066 ￦ 66,801 ￦ 2,306,198 Less: Accumulated depreciation (1,568 ) (583,976 ) —  (585,544 ) Beginning, net 813,763 840,090 66,801 1,720,654 Acquisition 14,569 17,351 55,478 87,398 Disposal and termination (14,725 ) (5,858 ) (17 ) (20,600 ) Depreciation —  (47,004 ) —  (47,004 ) Transfer from(to) property and equipment 63,278 140,229 2,676 206,183 Transfer and others 2,907 (28,350 ) 12,170 (13,273 ) Ending, net ￦ 879,792 ￦ 916,458 ￦ 137,108 ￦ 1,933,358 Acquisition cost ￦ 881,360 ￦ 1,577,736 ￦ 137,108 ￦ 2,596,204 Less: Accumulated depreciation (1,568 ) (661,278 ) —  (662,846 ) 2023 (in millions of Korean won) Land Buildings Construction- Total Acquisition cost ￦ 881,360 ￦ 1,577,736 ￦ 137,108 ￦ 2,596,204 Less: Accumulated depreciation (1,568 ) (661,278 ) —  (662,846 ) Beginning, net 879,792 916,458 137,108 1,933,358 Acquisition —  57,529 153,279 210,808 Disposal and termination (8,167 ) (9,323 ) —  (17,490 ) Depreciation —  (52,869 ) —  (52,869 ) Transfer from(to) property and equipment 37,725 88,336 189 126,250 Transfer and others 1 27,544 (29,467 ) (1,922 ) Ending, net ￦ 909,351 ￦ 1,027,675 ￦ 261,109 ￦ 2,198,135 Acquisition cost ￦ 910,919 ￦ 1,750,677 ￦ 261,109 ￦ 2,922,705 Less: Accumulated depreciation (1,568 ) (723,002 ) —  (724,570 )

Intangible Assets (Tables)

Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
Summary of Intangible Assets	(1) Changes in intangible assets for the years ended December 31, 2022 and 2023, are as follows: 2022 (in millions of Korean won) Goodwill Development Software Frequency usage rights Others Total Acquisition cost ￦ 1,002,530 ￦ 1,812,377 ￦ 1,083,426 ￦ 2,617,647 ￦ 1,426,576 ￦ 7,942,556 Less: Accumulated amortization (including accumulated impairment loss and others) (305,658 ) (1,584,004 ) (944,001 ) (778,516 ) (883,044 ) (4,495,223 ) Beginning, net ￦ 696,872 ￦ 228,373 ￦ 139,425 ￦ 1,839,131 ￦ 543,532 ￦ 3,447,333 Acquisition and capital expenditure 19,455 45,997 55,651 —  225,886 346,989 Disposal and termination —  (5,503 ) (48 ) —  (20,117 ) (25,668 ) Amortization —  (93,374 ) (54,748 ) (350,265 ) (128,874 ) (627,261 ) Impairment (24,006 ) (744 ) (508 ) —  (5,416 ) (30,674 ) Acquisition and disposition of businesses —  (2,320 ) (802 ) —  (7,144 ) (10,266 ) Others 15,902 (573 ) 16,106 (610 ) (1,445 ) 29,380 Ending, net ￦ 708,223 ￦ 171,856 ￦ 155,076 ￦ 1,488,256 ￦ 606,422 ￦ 3,129,833 Acquisition cost 1,037,887 1,803,687 1,156,951 2,617,707 1,532,061 8,148,293 Less: Accumulated amortization (including accumulated impairment loss and others) (329,664 ) (1,631,831 ) (1,001,875 ) (1,129,451 ) (925,639 ) (5,018,460 ) 2023 (in millions of Korean won) Goodwill Development Software Frequency usage rights Others Total Acquisition cost ￦ 1,037,887 ￦ 1,803,687 ￦ 1,156,951 ￦ 2,617,707 ￦ 1,532,061 ￦ 8,148,293 Less: Accumulated amortization (including accumulated impairment loss and others) (329,664 ) (1,631,831 ) (1,001,875 ) (1,129,451 ) (925,639 ) (5,018,460 ) Beginning, net 708,223 171,856 155,076 1,488,256 606,422 3,129,833 Acquisition and capital expenditure 1 —  33,078 38,603 37 238,019 309,737 Disposal and termination —  (4,812 ) (397 ) —  (6,431 ) (11,640 ) Amortization 2 —  (63,052 ) (52,265 ) (350,276 ) (226,316 ) (691,909 ) Impairment (230,352 ) (128 ) (16 ) —  (5,711 ) (236,207 ) Acquisition and disposition of businesses 6,207 —  (108 ) —  (69 ) 6,030 Others 4,349 1,658 11,769 175 10,066 28,017 Ending, net ￦ 488,427 ￦ 138,600 ￦ 152,662 ￦ 1,138,192 ￦ 615,980 ￦ 2,533,861 Acquisition cost ￦ 1,036,354 ￦ 1,790,446 ￦ 1,196,329 ￦ 2,415,243 ￦ 1,725,087 ￦ 8,163,459 Less: Accumulated amortization (including accumulated impairment loss and others) (547,927 ) (1,651,846 ) (1,043,667 ) (1,277,051 ) (1,109,107 ) (5,629,598 ) 1 The amounts include the transferred amount from Property and Equipment account. 2 Amounts include ￦ (2) Goodwill, amounting to ￦ million, is not subject to amortization as of December 31, 2023 (December 31, 2022: ￦ million).
Summary of Goodwill Allocated to Each Cash-Generation Unit	(3) Goodwill is allocated to the Group’s cash-generating unit which is identified by operating segments. As of December 31, 2023, goodwill allocated to each cash-generating unit is as follows: (in millions of Korean won) Cash generating Unit Amount Mobile services 1,9 ￦ 65,057 BC Card Co., Ltd. 2 41,234 HCN Co., Ltd. 3 130,242 GENIE Music Corporation 4 50,214 MILLIE Co., Ltd. 5 54,725 PlayD Co., Ltd. 6 40,068 KT Telecop Co., Ltd. 7 15,418 Epsilon Global Communications Pte. Ltd. 8 45,670 KT MOS Bukbu Co., Ltd and others 45,799 Total ￦ 488,427 1 The recoverable amounts of mobile services business are calculated based on value-in use calculations. These calculations use discounted cash flow projections for the next five years based on financial budgets. A terminal growth rate of 0.0% was applied for the cash flows expected to be incurred after five years. This growth rate does not exceed the average growth rate of the industry which the cash-generating unit belongs in. The Group estimated its revenue growth rate 0.56% based on past performance and its expectation of future market changes. In addition, management estimated the cash flow based on past performance and its expectation of market growth, and the discount rates 6.68% used reflected specific risks relating to the relevant CGU. As a result of the impairment test, the Group concluded that the carrying amount of CGU does not exceed the recoverable amount. Accordingly, the Group did not recognize an impairment loss on goodwill on mobile business for the years ended December 31, 2021, 2022 and 2023. 2 The recoverable amounts of BC Card Co., Ltd. are calculated based on value-in use calculations. These calculations use discounted cash flow projections for the next five years based on financial budgets. A terminal growth rate of 0.0% was applied for the cash flows expected to be incurred after five years. This growth rate does not exceed the average growth rate of the industry which the cash-generating unit belongs in. The Group estimated its revenue growth rate 0.04% based on past performance and its expectation of future market changes. In addition, management estimated the cash flow based on past performance and its expectation of market growth, and the discount rates 5.22% used reflected specific risks relating to the relevant CGU. As a result of the impairment test, the Group concluded that the carrying amount of CGU does not exceed the recoverable amount. Accordingly, the Group did not recognize an impairment loss on goodwill on BC Card Co., Ltd. for the years ended December 31, 2021, 2022 and 2023. 3 The recoverable amounts of HCN Co., Ltd. are calculated based on value-in use calculations. These calculations use discounted cash flow projections for the next five years based on financial budgets. A terminal growth rate of 0.0% was applied for the cash flows expected to be incurred after five years. This growth rate does not exceed the average growth rate of the industry which the cash-generating unit belongs in. The Group estimated its revenue growth rate 2.21% based on past performance and its expectation of future market changes. In addition, management estimated the cash flow based on past performance and its expectation of market growth, and the discount rates 11.37% used reflected specific risks relating to the relevant CGU. As a result of the impairment test, HCN’s recoverable amount was KRW 130,242 million, which was less than the carrying amount, and KRW 98,432 million of the impairment loss was record operating 4 The recoverable amounts of GENIE Music Corporation are calculated based on value-in use calculations. These calculations use discounted cash flow projections for the next five years based on financial budgets. A terminal growth rate of 0.0% was applied for the cash flows expected to be incurred after five years. This growth rate does not exceed the average growth rate of the industry which the cash-generating unit belongs in. The Group estimated its revenue growth rate 4.51% based on past performance and its expectation of future market changes. In addition, management estimated the cash flow based on past performance and its expectation of market growth, and the discount rates 16.73% used reflected specific risks relating to the relevant CGU. As a result of the impairment test, the Group concluded that the carrying amount of CGU does not exceed the recoverable amount. Accordingly, the Group did not recognize an impairment loss on goodwill on GENIE Music Corporation for the years ended December 31, 2023. 5 The recoverable amounts of MILLIE Co., Ltd. are calculated based on value-in use calculations. These calculations use discounted cash flow projections for the next four years based on financial budgets. A terminal growth rate of 1.0% was applied for the cash flows expected to be incurred after four years. This growth rate does not exceed the average growth rate of the industry which the cash-generating unit belongs in. The Group estimated its revenue growth rate 9.96% based on past performance and its expectation of future market changes. In addition, management estimated the cash flow based on past performance and its expectation of market growth, and the discount rates 22.48% used reflected specific risks relating to the relevant CGU. As a result of the impairment test, the Group concluded that the carrying amount of CGU does not exceed the recoverable amount. Accordingly, the Group did not recognize an impairment loss on goodwill on MILLIE Co., Ltd. for the years ended December 31, 2023. 6 The recoverable amount of PlayD Co., Ltd is calculated based on fair value less cost to sell. 7 The recoverable amounts of KT Telecop Co., Ltd. are calculated based on value-in use calculations. These calculations use discounted cash flow projections for the next five years based on financial budgets. A terminal growth rate of 1.0% was applied for the cash flows expected to be incurred after five years. This growth rate does not exceed the average growth rate of the industry which the cash-generating unit belongs in. The Group estimated its revenue growth rate 3.54% based on past performance and its expectation of future market changes. In addition, management estimated the cash flow based on past performance and its expectation of market growth, and the discount rates 9.04% used reflected specific risks relating to the relevant CGUs. As a result of the impairment test, the Group concluded that the carrying amount of CGU does not exceed the recoverable amount. Accordingly, the Group did not recognize an impairment loss on goodwill on KT Telecop Co., Ltd. for the years ended December 31, 2021, 2022 and 2023. 8 The recoverable amounts of Epsilon Global Communications Pte. Ltd. are calculated based on value-in use calculations. These calculations use discounted cash flow projections for the next nine years based on financial budgets. A terminal growth rate of 1.0% was applied for the cash flows expected to be incurred after nine years. This growth rate does not exceed the average growth rate of the industry which the cash-generating unit belongs in. The Group estimated its revenue growth rate 10.57% based on past performance and its expectation of future market changes. In addition, management estimated the cash flow based on past performance and its expectation of market growth, and the discount rates 8.84% used reflected specific risks relating to the relevant CGU. As a result of the impairment test, Epsilon Global Communications’s recoverable amount was KRW 45,670 million, which was less than the carrying amount, and KRW 118,609 million of the impairment loss was record ope rating 9 The Group performed its impairment assessment for long-lived assets attributed to the Information and Communication Technology (“ICT”) reporting segment, which includes the Cash-Generating Units of Mobile, Fixed line, and Corporate Services (the “CGUs”). The Group compared the carrying value of each CGU to the estimated recoverable amount. The recoverable amounts of ICT reporting segment are calculated based on value-in use calculations. These calculations use discounted cash flow projections for the next five years based on financial budgets. A terminal growth rate of 0.0% was applied for the cash flows expected to be incurred after five years. This growth rate does not exceed the average growth rate of the industry which the cash-generating unit belongs in. The Group estimated its revenue growth rate 0.56% ~ 9.14% based on past performance and its expectation of future market changes. In addition, management estimated the cash flow based on past performance and its expectation of market growth, and the discount rate 6.68%. Accordingly, the Group did not recognize an impairment loss on ICT reporting segment for the years ended December 31, 2021, 2022 and 2023.

Investments in Associates and_2

Investments in Associates and Joint Ventures (Tables)	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
Summary of Details of Associates	(1) Details of associates as of December 31, 2022 and 2023, are as follows:  Percentage of ownership (%)  Location Closing December 31, 2022 December 31, 2023 KIF Investment Fund 33.3 % 33.3 % Korea December K Bank Inc. 33.7 % 33.7 % Korea December HD Hyundai Robotics Co., Ltd. (formerly Hyundai Robotics Co., Ltd.) 1 10.0 % 10.0 % Korea December Megazone Cloud Corporation 1 6.8 % 6.8 % Korea December IGIS No. 468-1 General Private Real Estate Investment Company 44.6 % 44.6 % Korea December KT-DSC Creative Economy Youth Start-up Investment Fund 28.6 % 28.6 % Korea December IGIS Professional Investors Private Investment Real Estate Investment LLCNo 395 35.3 % 35.3 % Korea December LS Marine Solution Co., Ltd (formerly KT Submarine Co., Ltd.). 1, 2 32.9 % 7.3 % Korea December 1 As of December 31, 2023, although the Group has less than 20
Summary of Changes in Investments in Associates and Joint Ventures	(2) Changes in investments in associates and joint ventures for the years ended December 31, 2022 and 2023, are as follows: 2022 (in millions of Korean won) Beginning Acquisition (Disposal) Share of net profit Others Ending KIF Investment Fund ￦ 178,935 ￦ —  ￦ 2,502 ￦ (10,458 ) ￦ 170,979 K Bank Inc. 831,737 —  29,010 (7,991 ) 852,756 HD Hyundai Robotics Co., Ltd. (formerly Hyundai Robotics Co., Ltd.) 48,725 —  798 (151 ) 49,372 Megazone Cloud Corporation —  130,001 (22,555 ) 28,753 136,199 IGIS No. 468-1 General Private Real Estate Investment Company —  25,000 (1,411 ) —  23,589 KT-DSC Creative Economy Youth Start-up Investment Fund 22,138 —  (13 ) (2 ) 22,123 IGIS Professional Investors Private Investment Real Estate Investment LLC No. 395 17,084 —  (464 ) —  16,620 Others 189,810 100,040 (24,688 ) (56,078 ) 209,084 ￦ 1,288,429 ￦ 255,041 ￦ (16,821 ) ￦ (45,927 ) ￦ 1,480,722 2023 (in millions of Korean won) Beginning Acquisition (Disposal) Share of net profit 1 Others Ending KIF Investment Fund ￦ 170,979 ￦ —  ￦ 5,443 ￦ 632 ￦ 177,054 K Bank Inc. 852,756 —  1,089 19,036 872,881 HD Hyundai Robotics Co., Ltd. (formerly Hyundai Robotics Co., Ltd.) 49,372 —  (1,637 ) (1 ) 47,734 Megazone Cloud Corporation 136,199 —  (4,583 ) 78 131,694 IGIS No. 468-1 General Private Real Estate Investment Company 23,589 —  (105 ) —  23,484 KT-DSC Creative Economy Youth Start-up Investment Fund 22,123 (500 ) 3,494 —  25,117 IGIS Professional Investors Private Investment Real Estate Investment LLC No 395 16,620 —  (4,678 ) —  11,942 LS Marine Solution Co., Ltd (formerly KT Submarine Co., Ltd.) —  —  255 23,237 1 23,492 Others 209,084 101,887 (34,912 ) (32,568 ) 243,491 ￦ 1,480,722 ￦ 101,387 ￦ (35,634 ) ￦ 10,414 ￦ 1,556,889 1 The amount represents the fair value of investment at the time the Company lost control (Refer to note above).
Summary of Financial Information of Associates and Joint Ventures	(3) Summarized financial information of associates and joint ventures as at and for the years ended December 31, 2022 and 2023, is as follows: (in millions of Korean won) December 31, 2022 Current Non-current assets Current Non-current liabilities KIF Investment Fund ￦ 98,132 ￦ 414,804 ￦ —  ￦ —  K Bank Inc. 16,562,742 71,265 14,830,983 2,168 HD Hyundai Robotics Co., Ltd. (formerly Hyundai Robotics Co., Ltd.). 278,413 135,380 63,009 64,335 Megazone Cloud Corporation 857,089 202,767 330,619 94,202 IGIS No. 468-1 General Private Real Estate Investment Company 52,851 —  12 —  KT-DSC Creative Economy Youth Start-up Investment Fund 908 76,884 362 —  IGIS Professional Investors Private Investment Real Estate Investment LLC No. 395 9,344 127,321 90,545 —  (in millions of Korean won) December 31, 2023 Current Non-current assets Current Non-current liabilities KIF Investment Fund ￦ 128,344 ￦ 402,819 ￦ —  ￦ —  K Bank Inc. 21,320,790 89,812 19,541,076 4,516 HD Hyundai Robotics Co., Ltd. 251,868 134,424 106,557 9,775 Megazone Cloud Corporation 874,778 267,605 341,679 205,087 IGIS No. 468-1 General Private Real Estate Investment Company 2,985 49,631 11 —  KT-DSC Creative Economy Youth Start-up Investment Fund 482 87,528 101 —  IGIS Professional Investors Private Investment Real Estate Investment LLC No 395 5,690 145,769 107,553 —  LS Marine Solution Co., Ltd. (formerly KT Submarine Co., Ltd.) 66,767 80,307 23,906 207 (in millions of Korean won) 2022 Operating Profit (loss) Other Total Dividends KIF Investment Fund ￦ 19,916 ￦ 7,505 ￦ (11,779 ) ￦ (4,274 ) ￦ 6,531 K Bank Inc. 558,872 86,498 (24,888 ) 61,610 —  HD Hyundai Robotics Co., Ltd. (formerly Hyundai Robotics Co., Ltd.). 181,944 9,332 (49 ) 9,283 —  Megazone Cloud Corporation 1,261,228 (293,186 ) (6,609 ) (299,795 ) —  IGIS No. 468-1 General Private Real Estate Investment Company 9 (3,161 ) —  (3,161 ) —  KT-DSC Creative Economy Youth Start-up Investment Fund 19,931 (53 ) —  (53 ) —  IGIS Professional Investors Private Investment Real Estate Investment LLC No. 395 —  (474 ) —  (474 ) —  (in millions of Korean won) 2023 Operating Profit (loss) Other Total Dividends KIF Investment Fund ￦ 33,017 ￦ 16,330 ￦ —  ￦ 16,330 ￦ 1,139 K Bank Inc. 946,559 10,560 56,609 67,169 —  HD Hyundai Robotics Co., Ltd. (formerly Hyundai Robotics Co., Ltd.). 167,949 (17,513 ) (1,093 ) (18,606 ) —  Megazone Cloud Corporation 1,410,078 (34,760 ) (3,021 ) (37,781 ) —  IGIS No. 468-1 General Private 6 (234 ) —  (234 ) —  KT-DSC Creative Economy Youth Start-up Investment Fund 19,849 12,227 —  12,227 —  IGIS Professional Investors Private Investment Real Estate —  (406 ) —  (406 ) —  LS Marine Solution Co., Ltd 70,779 11,618 (289 ) 11,329 —
Summary of Reconciliation of Carrying Amount of Interests in the Associates and Joint Ventures	(4) Details of a reconciliation of the summarized financial information to the carrying amount of interests in the associates and joint ventures as at and for the years ended December 31, 2022 and 2023, are as follows: (in millions of Korean won) 2022 Net assets (a) Percentage of (b) Share in net (c)=(a)x(b) Intercompany Book amount (c)+(d) KIF Investment Fund ￦   512,936 33.33 % ￦ 170,979 ￦ —  ￦ 170,979 K Bank Inc. 1,800,856 33.72 % 607,276 245,480 852,756 HD Hyundai Robotics Co., Ltd. (formerly Hyundai Robotics Co., Ltd.) 286,449 10.00 % 28,645 20,727 49,372 Megazone Cloud Corporation 635,035 6.83 % 43,360 92,839 136,199 IGIS No. 468-1 General Private Real Estate Investment Company 52,839 44.64 % 23,589 —  23,589 KT-DSC Creative Economy Youth Start-up Investment Fund 77,430 28.57 % 22,123 —  22,123 IGIS Professional Investors Private Investment Real Estate Investment LLC No. 395 46,120 35.29 % 16,278 342 16,620 (in millions of Korean won) 2023 Net assets (a) Percentage of (b) Share in net (c)=(a)x(b) Intercompany Book amount (c)+(d) KIF Investment Fund ￦ 531,164 33.33 % ￦ 177,054 ￦ —  ￦ 177,054 K Bank Inc. 1,865,010 33.72 % 628,910 243,971 872,881 HD Hyundai Robotics Co., Ltd. (formerly Hyundai Robotics Co., Ltd.) 269,960 10.00 % 26,996 20,738 47,734 Megazone Cloud Corporation 547,786 6.83 % 37,404 94,290 131,694 IGIS No. 468-1 General Private Real Estate Investment Company 52,605 44.64 % 23,484 —  23,484 KT-DSC Creative Economy Youth Start-up Investment Fund 87,908 28.57 % 25,117 —  25,117 IGIS Professional Investors Private Investment Real Estate Investment LLC No 395 43,905 35.29 % 15,496 (3,554 ) 11,942 LS Marine Solution Co., Ltd (formerly KT Submarine Co., Ltd.) 122,961 7.30 % 8,972 14,520 23,492

Trade and Other Payables (Table

Trade and Other Payables (Tables)	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
Summary of Trade and Other Payables	(1) Details of trade and other payables as of December 31, 2022 and 2023, are as follows: (in millions of Korean won) December 31, December 31, Current liabilities Trade payables ￦ 1,150,515 ￦ 1,297,752 Other payables 6,182,650 6,757,170 Total ￦ 7,333,165 ￦ 8,054,922 Non-current liabilities Trade payables ￦ —  ￦ 3,202 Other payables 1,064,099 816,356 Total ￦ 1,064,099 ￦ 819,558
Summary of Other Payables	(2) Details of other payables as of December 31, 2022 and 2023 are as follows: (in millions of Korean won) December 31, December 31, Non-trade payables 1 ￦ 4,981,300 ￦ 5,207,165 Accrued expenses 1,234,023 1,267,700 Operating deposits 818,603 880,810 Others 212,823 217,851 Less: non-current (1,064,099 ) (816,356 ) Current ￦ 6,182,650 ￦ 6,757,170 1 As of December 31, 2023, credit sale liabilities amounting to ￦ ￦

Borrowings (Tables)

Borrowings (Tables)	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
Summary of Borrowings	(in millions of Korean won and foreign currencies in thousands) December 31, 2022 December 31, 2023 Type Maturity Annual interest Foreign Korean Foreign Korean MTNP notes 1 Sep. 7, 2034 6.500% USD 100,000 ￦ 126,730 USD 100,000 ￦ 128,940 MTNP notes Jul. 18, 2026 2.500% USD 400,000 506,920 USD 400,000 515,760 MTNP notes Aug. 23, 2023 —  USD 100,000 126,730 —  —  MTNP notes Jul. 19, 2024 0.330% JPY 400,000 3,813 JPY 400,000 3,651 MTNP notes Sep. 1. 2025 1.000% USD 400,000 506,920 USD 400,000 515,760 FR notes 2 Nov. 1, 2024 Compounded SOFR+1.210% USD 350,000 443,555 USD 350,000 451,290 FR notes Jun. 19, 2023 —  SGD 284,000 267,843 —  —  MTNP notes Jan. 21, 2027 1.375% USD 300,000 380,190 USD 300,000 386,820 MTNP notes Aug. 08, 2025 4.000% USD 500,000 633,650 USD 500,000 644,700 The 183-3rd Public bond Dec. 22, 2031 4.270% —  160,000 —  160,000 The 184-2nd Public bond Apr. 10, 2023 —  —  190,000 —  —  The 184-3rd Public bond Apr. 10, 2033 3.170% —  100,000 —  100,000 The 186-3rd Public bond Jun. 26, 2024 3.418% —  110,000 —  110,000 The 186-4th Public bond Jun. 26, 2034 3.695% —  100,000 —  100,000 The 187-3rd Public bond Sep. 2, 2024 3.314% —  170,000 —  170,000 The 187-4th Public bond Sep. 2, 2034 3.546% —  100,000 —  100,000 The 188-2nd Public bond Jan. 29, 2025 2.454% —  240,000 —  240,000 The 188-3rd Public bond Jan. 29, 2035 2.706% —  50,000 —  50,000 The 189-3rd Public bond Jan. 28, 2026 2.203% —  100,000 —  100,000 The 189-4th Public bond Jan. 28, 2036 2.351% —  70,000 —  70,000 The 190-2nd Public bond Jan. 30, 2023 —  —  150,000 —  —  The 190-3rd Public bond Jan. 30, 2028 2.947% —  170,000 —  170,000 The 190-4th Public bond Jan. 30, 2038 2.931% —  70,000 —  70,000 The 191-2nd Public bond Jan. 15, 2024 2.088% —  80,000 —  80,000 The 191-3rd Public bond Jan. 15, 2029 2.160% —  110,000 —  110,000 The 191-4th Public bond Jan. 14, 2039 2.213% —  90,000 —  90,000 The 192-2nd Public bond Oct. 11, 2024 1.578% —  100,000 —  100,000 The 192-3rd Public bond Oct. 11, 2029 1.622% —  50,000 —  50,000 The 192-4th Public bond Oct. 11, 2039 1.674% —  110,000 —  110,000 The 193-1st Public bond Jun. 16, 2023 —  —  150,000 —  —  The 193-2nd Public bond Jun. 17, 2025 1.434% —  70,000 —  70,000 The 193-3rd Public bond Jun. 17, 2030 1.608% —  20,000 —  20,000 The 193-4th Public bond Jun. 15, 2040 1.713% —  60,000 —  60,000 (in millions of Korean won and foreign currencies in thousands) December 31, 2022 December 31, 2023 Type Maturity Annual interest Foreign Korean Foreign Korean The 194-1st Public bond Jan. 26, 2024 1.127% —  130,000 —  130,000 The 194-2nd Public bond Jan. 27, 2026 1.452% —  140,000 —  140,000 The 194-3rd Public bond Jan. 27, 2031 1.849% —  50,000 —  50,000 The 194-4th Public bond Jan. 25, 2041 1.976% —  80,000 —  80,000 The 195-1st Public bond Jun. 10, 2024 1.387% —  180,000 —  180,000 The 195-2nd Public bond Jun. 10, 2026 1.806% —  80,000 —  80,000 The 195-3rd Public bond Jun. 10, 2031 2.168% —  40,000 —  40,000 The 196-1st Public bond Jan. 27, 2025 2.596% —  270,000 —  270,000 The 196-2nd Public bond Jan. 27, 2027 2.637% —  100,000 —  100,000 The 196-3rd Public bond Jan. 27, 2032 2.741% —  30,000 —  30,000 The 197-1st Public bond Jun. 27, 2025 4.191% —  280,000 —  280,000 The 197-2nd Public bond Jun. 29, 2027 4.188% —  120,000 —  120,000 The 198-1st Public bond Jan. 10, 2025 3.847% —  —  —  70,000 The 198-2nd Public bond Jan. 12, 2026 3.869% —  —  —  150,000 The 198-3rd Public bond Jan. 12, 2028 3.971% —  —  —  80,000 The 199-1st Public bond Jul. 11, 2025 4.028% —  —  —  85,000 The 199-2nd Public bond Jul. 10, 2026 4.146% —  —  —  160,000 The 199-3rd Public bond Jul. 12, 2028 4.221% —  —  —  155,000 The 18-1st unsecured bond Jul. 2, 2024 1.844% —  100,000 —  100,000 The 18-2nd unsecured bond Jul. 2, 2026 2.224% —  50,000 —  50,000 The 148th Won-denominated unsecured bond Jun. 23, 2023 —  —  100,000 —  —  The 149-1st Won-denominated unsecured bond Mar. 8, 2024 1.440% —  70,000 —  70,000 The 149-2nd Won-denominated unsecured bond Mar. 10, 2026 1.756% —  30,000 —  30,000 The 150-1st Won-denominated unsecured bond Apr. 7, 2023 —  —  20,000 —  —  The 150-2nd Won-denominated unsecured bond Apr. 8, 2024 1.462% —  30,000 —  30,000 The 151-1st Won-denominated unsecured bond May 12, 2023 —  —  10,000 —  —  The 151-2nd Won-denominated unsecured bond May 14, 2024 1.432% —  40,000 —  40,000 The 152-1st Won-denominated unsecured bond Aug. 30, 2024 1.813% —  80,000 —  80,000 The 152-2nd Won-denominated unsecured bond Aug. 28, 2026 1.982% —  20,000 —  20,000 The 153-1st Won denominated unsecured bond Nov. 10, 2023 —  —  30,000 —  —  The 153-2nd Won-denominated unsecured bond Nov. 11, 2024 2.425% —  70,000 —  70,000 The 154th Won-denominated unsecured bond Jan. 23, 2025 2.511% —  40,000 —  40,000 The 155-1st Won-denominated unsecured bond Feb. 29, 2024 2.615% —  50,000 —  50,000 The 155-2nd Won-denominated unsecured bond Sep. 2, 2024 2.745% —  20,000 —  20,000 The 155-3rd Won-denominated unsecured bond Feb. 28, 2025 2.880% —  20,000 —  20,000 The 156-1st Won-denominated unsecured bond 3 Mar. 25, 2025 5Y CMS+0.404% —  60,000 —  60,000 (in millions of Korean won and foreign currencies in thousands) December 31, 2022 December 31, 2023 Type Maturity Annual interest Foreign Korean Foreign Korean The 156-2nd Won-denominated unsecured bond 3 Mar. 25, 2032 10Y CMS+0.965% —  40,000 —  40,000 The 157-1st Won-denominated unsecured bond Apr. 28, 2023 —  —  30,000 —  —  The 157-2nd Won-denominated unsecured bond Oct. 27, 2023 —  —  30,000 —  —  The 158th Won-denominated unsecured bond Jan. 27, 2025 4.421% —  50,000 —  50,000 The 159-1st Won-denominated unsecured bond Aug. 09, 2024 4.267% —  30,000 —  30,000 The 159-2nd Won-denominated unsecured bond Aug. 11, 2027 4.505% —  30,000 —  30,000 The 160-1st Won-denominated unsecured bond Jun. 14, 2024 5.615% —  20,000 —  20,000 The 160-2nd Won-denominated unsecured bond Dec. 13, 2024 5.667% —  20,000 —  20,000 The 160-3rd Won-denominated unsecured bond Dec. 12, 2025 5.769% —  30,000 —  30,000 The 161-1st Won-denominated unsecured bond Jun. 21, 2024 5.527% —  10,000 —  10,000 The 161-2nd Won-denominated unsecured bond Dec. 20, 2024 5.557% —  20,000 —  20,000 The 161-3rd Won-denominated unsecured bond Jun. 20, 2025 5.594% —  30,000 —  30,000 The 161-4th Won-denominated unsecured bond Dec. 22, 2025 5.615% —  10,000 —  10,000 The 162-1st Won-denominated unsecured bond Dec. 27, 2023 —  —  50,000 —  —  The 162-2nd Won-denominated unsecured bond Jan. 26, 2024 5.069% —  40,000 —  40,000 The 162-3rd Won-denominated unsecured bond Apr. 26, 2024 5.080% —  10,000 —  10,000 The 163-1st Won-denominated unsecured bond Feb. 20, 2026 4.059% —  —  —  20,000 The 163-2nd Won-denominated unsecured bond Feb. 22, 2028 4.311% —  —  —  80,000 The 164-1st Won-denominated unsecured bond Apr. 12, 2024 3.778% —  —  —  10,000 The 164-2nd Won-denominated unsecured bond Oct. 24, 2024 3.821% —  —  —  30,000 The 164-3rd Won-denominated unsecured bond Apr. 14, 2028 4.220% —  —  —  30,000 The 165-1st Won-denominated unsecured bond May. 09, 2025 3.870% —  —  —  30,000 The 165-2nd Won-denominated unsecured bond Nov. 09, 2026 3.932% —  —  —  10,000 The 165-3rd Won-denominated unsecured bond May. 07, 2027 3.972% —  —  —  30,000 The 166-1st Won-denominated unsecured bond Nov. 22. 2024 4.205% —  —  —  20,000 The 166-2nd Won-denominated unsecured bond Apr. 22. 2025 4.310% —  —  —  40,000 The 166-3rd Won-denominated unsecured bond May. 21. 2025 4.332% —  —  —  10,000 The 166-4th Won-denominated unsecured bond May. 22. 2025 4.332% —  —  —  40,000 The 167-1st Won-denominated unsecured bond Dec. 20. 2024 3.865% —  —  —  30,000 The 167-2nd Won-denominated unsecured bond Jan. 22. 2025 3.864% —  —  —  50,000 The 167-3rd Won-denominated unsecured bond Feb. 21. 2025 3.864% —  —  —  10,000 The 167-4th Won-denominated unsecured bond Dec. 22. 2025 3.858% —  —  —  10,000 Subtotal 8,406,351 8,446,921 Less: Current portion (1,154,101 ) (1,924,523 ) Discount on bonds (23,728 ) (19,248 ) Total ￦ 7,228,522 ￦ 6,503,150 1 As of December 31, 2023, the Controlling Company has outstanding notes in the amount of USD 100 million with fixed interest rates under Medium Term Note Program (“MTNP”) registered in the Singapore Stock Exchange, which allowed issuance of notes of up to USD 2,000 million. However, the MTNP has been terminated since 2007. 2 The Daily SOFR is approximately 5.380% as of December 31, 2023. Due to the recent suspension of LIBOR calculation, the Group changed the alternative indicator interest rate to Compounded SOFR+ 1.210 3 The CMS (5Y) and CMS (10Y) is approximately 2.993% and 2.990%, respectively as of December 31, 2023.
Summary of Korean Won and Foreign Currency Borrowings	2 Convertible bonds (in millions of Korean won) Type Issuance Date Maturity Annual December 31, December 31, The 1st CB (Private) 1 Jun. 5, 2020 Jun. 5, 2025 2 ￦ 8,000 ￦ 8,000 The 1st unsecured CB 3 Jul. 25, 2022 Jan. 25, 2025 —  30,000 —  Redemption premium 4,565 2,267 Bond discount issuance (7,206 ) (1,811 ) Subtotal 35,359 8,456 Current portion —  (8,456 ) Total ￦ 35,359 ￦ —  1 Common shares of Storywiz are subject to conversion (appraisal period: June 5, 2021~May 4, 2025). 2 Nominal interest rate and maturity yield is approximately 0% and 5%, respectively, and will be settled on maturity. 3 During the current period, bonds of kt cloud are converted to 73,800 of Common shares and 73,800 of preference shares.
Summary of Short-term Borrowings	a. Short-term borrowings (in millions of Korean won) December 31, 2022 December 31, 2023 Type Financial institution Annual interest Foreign currency Korean won Foreign currency Korean won Operational Shinhan Bank 3.840%~6.430% —  ￦ 105,000 —  ￦ 151,500 —  —  30,000 —  —  Woori Bank 1, —  —  50,000 —  —  4.400% —  70,000 CD(91D)+1.960% —  —  —  20,000 Korea Development Bank 3.230%~4.950% —  27,201 —  34,900 Industrial Bank of Korea 4.862% —  6,000 —  6,000 Hana Bank 1 CD(91D)+0.126% —  5,000 —  4,800 KB SECURITIES 4.110%~4.910% —  94,822 —  69,635 NH INVESTMENT & SECURITIES —  —  20,000 —  —  HSBC 2 Compounded SOFR +2.100% USD 18,500 23,451 USD 23,600 30,450 NongHyup Bank 4.880% —  9,000 —  8,500 —  —  15,000 —  —  IBK Securities —  —  20,000 —  —  Hi Investment & Securities —  —  99,524 —  —  Korea Investment 4.910% —  —  30,000 Total ￦ 504,998 ￦ 425,785 1 CD (91D) is approximately 3.820% as of December 31, 2023. 2 The Daily SOFR is approximately 5.380% as of December 31, 2023.
Summary of Long-term Borrowings	b. Long-term borrowings (in millions of Korean won and thousands of foreign currencies) December 31, 2022 December 31, 2023 Financial institution Type Annual interest rates Foreign currency Korean won Foreign currency Korean won Export-Import Bank of Korea Inter-Korean Cooperation Fund 1 1.00% —  ￦ 1,974 —  ￦ 1,480 CA-CIB General loans 3.380%~4.150% —  200,000 —  200,000 JPM General loans 2.700%~4.480% —  100,000 —  200,000 DBS General loans 4.079% —  100,000 —  100,000 Shinhan Bank General loans 2 Term SOFR(3M)+1.100% USD 8,910 11,292 USD 8,910 11,489 General loans —  USD 38,000 48,158 —  —  General loans 1.900%~3.200% USD 31,472 39,855 USD 40,655 General loans 3 4.490% —  62,398 —  62,398 General loans 2 Term SOFR(3M)+1.300% USD 21,127 26,774 USD 27,241 General loans 2 Term SOFR(3M)+1.940% —  —  USD 45,129 General loans 2 CD(91D)+1.800% —  —  —  16,900 General loans 2 EURIBOR(3M)+0.900% EUR 7,700 10,404 EUR 7,700 10,985 Woori Bank General loans 3.320%~5.800% —  15,000 —  41,526 PF loans —  —  40,682 —  —  Hi Investment & Securities CP 2.302% —  90,724 —  92,994 Bookook Investment CP 3.490%~3.603% —  18,806 —  19,525 Korea Investment CP 3.622% —  73,039 —  75,928 Korea Development Bank General loans 3.000%~4.870% —  38,000 —  137,000 NH Jayang PF loans 2 CD(91D)+1.150 —  59,066 —  53,033 Kyobo Life Insurance PF loans 2 CD(91D)+1.150%~ CD(91D) +3.450% —  66,390 —  84,586 Standard Chartered Bank Korea PF loans 2 CD(91D)+1.150%~ CD(91D) +3.450% —  44,260 —  56,390 General loans 2 CD(91D)+0.750% —  —  —  32,000 Samsung Life Insurance PF loans 1.860%~4.160% —  36,883 —  46,992 Subtotal 1,083,705 1,356,251 Less: Current portion (167,943 ) (699,800 ) ￦ 915,762 ￦ 656,451 1 The above Inter-Korean Cooperation Fund is repayable in installments over 13 years after a seven-year grace period. 2 EURIBOR (3M), Term SOFR (3M) and CD (91D) are approximately 3.909%, 5.331%, 3.820% respectively, as of December 31, 2023. 3 The general loans are repayable in installments over 4 years after a three-year grace period.
Summary of Repayment of Borrowings Including the Current Liabilities	(2) Repayment schedule of the Group’s debentures and borrowings including the portion of current liabilities as of December 31, 2023, is as follows: (in millions of Korean won) Bonds Borrowings Total In local In foreign Sub- total In local In foreign Sub- total Jan. 1, 2024 ~ Dec. 31, 2024 ￦ 1,478,000 ￦ 454,941 ￦ 1,932,941 ￦ 1,016,254 ￦ 109,331 ￦ 1,125,585 ￦ 3,058,526 Jan. 1, 2025 ~ Dec. 31, 2025 1,445,000 1,160,460 2,605,460 421,322 56,618 477,940 3,083,400 Jan. 1, 2026 ~ Dec. 31, 2026 760,000 515,760 1,275,760 109,087 —  109,087 1,384,847 Jan. 1, 2027 ~ Dec. 31, 2027 280,000 386,820 666,820 15,600 —  15,600 682,420 After Jan. 1, 2028 1,845,000 128,940 1,973,940 53,825 —  53,825 2,027,765 Total ￦ 5,808,000 ￦ 2,646,921 ￦ 8,454,921 ￦ 1,616,088 ￦ 165,949 ￦ 1,782,037 ￦ 10,236,958

Provisions (Tables)

Provisions (Tables)	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
Summary of Changes in Provisions	Changes in provisions for the years ended December 31, 2022 and 2023, are as follows: 2022 (in millions of Korean won) Litigation Restoration cost Others Total Beginning balance ￦ 80,165 ￦ 107,358 ￦ 69,874 ￦ 257,397 Increase (Transfer) 6,005 13,027 5,847 24,879 Usage (6,155 ) (8,143 ) (15,783 ) (30,081 ) Reversal (43,686 ) (3,685 ) (4,418 ) (51,789 ) Others —  405 (445 ) (40 ) Ending balance ￦ 36,329 ￦ 108,962 ￦ 55,075 ￦ 200,366 Current 34,730 19,918 54,485 109,133 Non-current ￦ 1,599 ￦ 89,044 ￦ 590 ￦ 91,233 2023 (in millions of Korean won) Litigation Restoration cost Others Total Beginning balance ￦ 36,329 ￦ 108,962 ￦ 55,075 ￦ 200,366 Increase (Transfer) 592 26,381 10,656 37,629 Usage (7,179 ) (1,138 ) (6,391 ) (14,708 ) Reversal (35 ) (653 ) (2,096 ) (2,784 ) Scope change —  —  (177 ) (177 ) Others —  (393 ) 2,290 1,897 Ending balance ￦ 29,707 ￦ 133,159 ￦ 59,357 ￦ 222,223 Current ￦ 29,130 ￦ 26,945 ￦ 59,134 ￦ 115,209 Non-current 577 106,214 223 107,014

Net Defined Benefit Liabiliti_2

Net Defined Benefit Liabilities (Assets) (Tables)	12 Months Ended
	Dec. 31, 2023
Statement [LineItems]
Summary of Amount Recognized in the Statements of Financial Position and Defined Benefit Obligations	(1) The amounts recognized in the statements of financial position as of December 31, 2022 and 2023, are determined as follows: (in millions of Korean won) December 31, 2022 December 31, 2023 Present value of defined benefit obligations ￦ 2,218,655 ￦ 2,365,793 Fair value of plan assets (2,478,143 ) (2,462,925 ) Liabilities ￦ 51,654 ￦ 63,616 Assets ￦ 311,142 ￦ 160,748
Summary of Changes in the Defined Benefit Obligations	(2) Changes in the defined benefit obligations for the years ended December 31, 2022 and 2023, are as follows: (in millions of Korean won) 2022 2023 Beginning ￦ 2,494,930 ￦ 2,218,655 Current service cost    238,068     213,489  Interest expense 59,041 103,874 Benefit paid (316,047 ) (358,298 ) Changes due to settlements of plan & Past Service Cost (701 ) 1 Remeasurements: Actuarial gains ( ) (13,048 ) 1,903 Actuarial gains ( ) (323,501 ) 138,462 Actuarial gains arising from experience adjustments 80,845 48,174 Acquisition and disposition of businesses, etc. (932 ) (467 ) Ending ￦ 2,218,655 ￦ 2,365,793 (3) Changes in the fair value of plan assets for the years ended December 31, 2022 and 2023, are as follows: (in millions of Korean won) 2022 2023 Beginning ￦ 2,314,632 ￦ 2,478,143 Interest income 55,902  121,336  Remeasurements: Return on plan assets (excluding amounts included in interest income) (8,542 ) 9,410 Benefits paid (287,419 ) (307,762 ) Employer contributions    401,358    165,128 Acquisition and disposition of businesses, etc. 2,212 (3,330 ) Ending ￦ 2,478,143 ￦ 2,462,925
Summary of Amounts Recognized in the Consolidated Statements of Operations	(4) Amounts recognized in the consolidated statements of profit or loss for the years ended December 31, 2021, 2022 and 2023, are as follows: (in millions of Korean won) 2021 2022 2023 Current service cost ￦ 249,125 ￦ 238,068 ￦ 213,922 Net Interest cost 5,047 3,139 (17,462 ) Changes due to settlements of plan & Past Service Cost (681 ) (701 ) 1 Transfer out (16,660 ) (15,102 ) (13,435 ) Total expenses ￦ 236,831 ￦ 225,404 ￦ 183,026
Summary of Principal Actuarial Assumptions	(5) Principal actuarial assumptions used are as follows: December 31, December 31, December 31, Discount rate 2.1%~3.70% 2.4%~6.29% 3.67%~5.51% Salary growth rate 1%~6.97% 1.82%~8.9% 1.7%~8.96%
Summary of Sensitivity of the Defined Benefit Obligations	(6) The sensitivity of the defined benefit obligations as of December 31, 2023, to changes in the principal assumptions is: (In percentage, in millions of Korean won ) Effect on defined benefit obligation Changes in Increase in Decrease in Discount rate 0.5% point ￦ ￦ 150,568 Salary growth rate 0.5% point 145,687  (135,431 )
Summary of Expected Maturity Analysis of Undiscounted Pension Benefits	The expected maturity analysis of undiscounted pension benefits as o (in millions of Korean won) Less than 1 year Between 1- Between 2- Over 5 years Total Pension benefits ￦ 257,315 ￦ 376,352 ￦ 910,076 ￦ 2,013,167 ￦ 3,556,910

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
Summary Of Major Commitments With Local Financial Institutions	(1) As of December 31, 2023, major commitments with local financial institutions are as follows: (in millions of Korean won and foreign currencies in thousands) Financial institution Limit Used amount Bank overdraft Kookmin Bank and others 374,000 — Inter-Korean Cooperation Fund Export-Import 37,700 1,480 Economic Cooperation Business Insurance Export-Import Bank of Korea 3,240 1,732 Collateralized loan on electronic accounts receivable-trade Kookmin Bank and others 545,350 42,822 Plus electronic notes payable Industrial Bank of Korea 50,000 885 Working capital loan Korea Development Bank and others 1,562,800 142,700 Shinhan Bank USD 76,509 USD 76,509 Woori Bank EUR 7,700 EUR 7,700 Facility loans Shinhan Bank and others 924,000 429,924 Derivatives transaction limit Korea Development Bank and others USD 1,970,000 USD 1,970,000 Citi Bank JPY 400,000 JPY 400,000 Total KRW 3,497,090 619,543 USD 2,046,509 2,046,509 EUR 7,700 7,700 JPY 400,000 400,000
Summary of Guarantees Received from Financial Institutions	(2) As of December 31, 2023, guarantees received from financial institutions are as follows: (in millions of Korean won and foreign currencies in thousands) Financial institution Limit Hana Bank Guarantee for payment in Korean currency 4,000 Comprehensive credit line and others 3,100 Guarantee for payment in foreign currency USD 59 Comprehensive credit line and others USD 10,300 Kookmin Bank Guarantee for payment in foreign currency USD 3,186 Shinhan Bank Guarantee for payment in Korean currency and others USD 94,517 Guarantee for payment in foreign currency and others VND 211,262 Woori Bank Guarantee for payment in Korean currency 5,200 Guarantee for payment in foreign currency USD 7,000 Korea Development Bank Refund guarantee for advances received USD 6,811 HSBC Guarantees for depositions USD 816 Seoul Guarantee Insurance Company Performance guarantee and others 366,395 Korea Software Financial Cooperative Performance guarantee and others 1,556,979 Korea Specialty Contractor Financial Cooperative Performance guarantee and others 135 Korea Housing Finance Corporation Performance guarantee and others 44,000 (in millions of Korean won and foreign currencies in thousands) Financial institution Limit Korea Housing & Urban Guarantee Corporation 1 Performance guarantee and others 691,530 Information & Communication Financial Cooperative Performance guarantee and others 78,183 Total KRW 2,749,522 USD 122,689 VND 211,262 1 Inventory assets( ￦ 278,031 ￦ 283,688
Summary Of Guarantees Provided By The Group For Third Party	(3) As of December 31, 2023, guarantees provided by the Group to a third party, are as follows: (in millions of Korean won) Subject to payment Creditor Limit Used Period KT Estate Inc Wonju Bando U-bora Mark Bridge Buyer Hana Bank 103,000 55,314 Aug. 5, 2022 KT Engineering Co., Ltd. 1 Gasan Solar Power Plant Inc. Shinhan Bank 4,700 364 Jan. 7, 2010 KT Engineering Co., Ltd. 1 Korea Cell Inc. Suhyup Bank 3,250 50 Feb. 17, 2014 KT Engineering Co., Ltd. 1 San-Ya Agricultural Association Corporation Suhyup Bank 3,250 51 Feb. 17, 2014 KT Alpha Co., Ltd. Cash payers T-commerce cash payers 821 — Apr. 14, 2023 Nasmedia Co., Ltd. Stockholders Association Members Korea 1,104 610 — 1 KT Engineering Co., Ltd., a subsidiary of the Group, is subject to payment, depending on the reimbursement of principal debtor.

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
Summary of balance sheet information about leases for lessee	The consolidated statement of financial position shows the following amounts relating to leases: (in millions of Korean won) December 31, December 31, Right-of-use assets Property and building ￦ 1,081,067 ￦ 1,019,537 Machinery and communication line facilities 50,794 89,150 Others 148,473 196,276 Total ￦ 1,280,334 ￦ 1,304,963 (in millions of Korean won) December 31, December 31, Lease liabilities 1 Current ￦ 315,892 ￦ 307,868 Non-Current 856,146 872,042 Total ￦ 1,172,038 ￦ 1,179,910 1 Included in the line items ‘Other current liabilities and other non-current liabilities’ in the consolidated statements of financial position (Notes 9).
Summary of statement of profit or loss information about leases for lessee	The consolidated statement of profit or loss relating to leases for the year ended December 31, 2021,2022 and 2023 are as follows: (in millions of Korean won) December 31, December 31, December 31, Depreciation of Right-of-use assets Property and building ￦ 303,984 ￦ 305,120 ￦ 297,571 Machinery and communication line facilities 41,794 31,140 32,794 Others 52,938 59,954 72,372 Total ￦ 398,716 ￦ 396,214 ￦ 402,737 Depreciation of Investment Properties ￦ 1,794 ￦ 15 ￦ —  Interest expense relating to lease liabilities 36,651 41,469 52,035 Expense relating to short-term leases 7,984 12,876 8,804 Expense relating to leases of low-value assets that are not short-term leases 26,033 26,813 26,290 Expense relating to variable lease payments not included in lease liabilities 8,400 4,827 9,288

Share Capital (Tables)

Share Capital (Tables)	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
Summary of Share Capital	As of December 31, 2022 and 2023, the Group has 1,000,000,000 shares authorized to issue and details are as follows: December 31, 2022 December 31, 2023 Number of issued shares Par value per share (Korean won) Ordinary (in millions of Korean won) Number of issued Par value per share (Korean won) Ordinary (in millions of Korean won) Ordinary shares 1 261,111,808 ￦ ￦ 257,860,760 ￦ ￦ 1 The Group retired 55,039,007 treasury shares against retained earnings. Based on the local regulations in Korea, upon retirement of shares, the Company has decreased the shares has decreased capital

Retained Earnings (Tables)

Retained Earnings (Tables)	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
Summary of Retained Earnings	Details of retained earnings as at December 31, 2022 and 2023, are as follows: (in millions of Korean won) December 31, December 31, Legal reserve 1 ￦ 782,249 ￦ 782,249 Voluntary reserves 2 4,651,362 4,651,362 Unappropriated retained earnings 8,821,705 9,042,256 Total ￦ 14,255,316 ￦ 14,475,867 1 The Commercial Code of the Republic of Korea requires the Controlling Company to appropriate, as a legal reserve, an amount equal to a minimum of 10% of cash dividends paid until such reserve equals 50% of its issued share capital. The reserve is not available for the payment of cash dividends but may be transferred to share capital with the approval of the Controlling Company’s Board of Directors or used to reduce accumulated deficit, if any, with the ratification of the Controlling Company’s majority shareholders. 2 The reserves of research and development of human resources in other surplus reserves are separately accumulated on disposal of retained earnings on tax filing adjustments when calculating income taxes in accordance with regulations of Tax Reduction and Exemption Control Act of Korea. Reversal of the reserves according to the relevant tax law can be paid out as dividends

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income and Other Components of Equity (Tables)	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
Summary of Accumulated Other Comprehensive Income	(1) As of December 31, 2022 and 2023, the details of the Controlling Company’s accumulated other comprehensive income are as follows: (in millions of Korean won) December 31, December 31, Changes in investments in associates and joint ventures ￦ (11,752 ) ￦ 4,023 Gain (loss) on derivatives valuation (7,109 ) (29,361 ) Gain (loss) on valuation of financial assets at fair value through other comprehensive income (52,100 ) 73,928 Exchange differences on translation for foreign operations (6,815 ) 3,817 Total ￦     (77,776 ) ￦     52,407
Summary of Changes in Accumulated Other Comprehensive Income	(2) Changes in accumulated other comprehensive income for the years ended December 31, 2022 and 2023, are as follows: 2022 ( in millions of Korean won) Beginning Increase/ decrease Reclassification to gain or loss Ending Changes in investments in associates and joint ventures ￦ (3,461 ) ￦ (8,291 ) ￦ —  ￦ (11,752 ) Gain (loss) on derivatives valuation 25,031 63,281 (95,421 ) (7,109 ) Gain on valuation of financial assets at fair value through other comprehensive income 108,685 (160,785 ) —  (52,100 ) Exchange differences on translation for foreign operations (12,786 ) 5,971 —  (6,815 ) Total ￦ 117,469 ￦ (99,824 ) ￦ (95,421 ) ￦ (77,776 ) 2023 (in millions of Korean won) Beginning Increase Reclassification to gain or loss Ending Changes in investments in associates and joint ventures ￦ (11,752 ) ￦ 15,775 ￦ —  ￦ 4,023 Gain (loss) on derivatives valuation (7,109 ) 15,690 (37,942 ) (29,361 ) Gain (loss) on valuation of financial assets at fair value through other comprehensive income (52,100 ) 126,028 —  73,928 Exchange differences on translation for foreign operations (6,815 ) 10,632 —  3,817 Total ￦ (77,776 ) ￦ 168,125 ￦ (37,942 ) ￦ 52,407
Summary of Other Components of Equity	(3) The Group’s other components of equity as at December 31, 2022 and 2023, are as follows: (in millions of Korean won) December 31, December 31, Treasury stock ￦ (202,295 ) ￦ (398,075 ) Gain or loss on disposal of treasury stock 1 (41,503 ) 3,220 Share-based payments 6,222 8,773 Equity transactions within consolidated entities 2 (334,576 ) (416,336 ) Total ￦ (572,152 ) ￦ (802,418 ) 1 The amount directly reflected in equity is ￦ ￦ 2 Profit or loss incurred from transactions with non-controlling interest and investment difference incurred from changes in ownership of subsidiaries are included.
Summary of Treasury Stock	(4) As of December 31, 2022 and 2023, the details of treasury stock are as follows: December 31, December 31, Number of shares (in shares) 5,069,130 11,447,338 Amounts (in millions of Korean won) ￦ 202,295 ￦ 398,075   Treasury stocks held as of December 31, 2023, are expected to be used for stock compensation for the Group’s directors, employees, and other purposes.

Share-based Payments (Tables)

Share-based Payments (Tables)	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
Summary of Details of Share-Based Payments	(1) Details of share-based payments granted by the Controlling to executives and employees, including the CEO, by the resolution of the Board of Directors for the years ended December 31, 2022 and 2023, are as follows: 2022 (in share) 16th grant Grant date June 9, 2022 Grantee CEO, internal directors, external directors, executives Vesting conditions Service condition: 1 year Non-market performance condition: achievement of performance Fair value per option (in Korean won) ￦ Total compensation costs (in Korean won) ￦ Exercise date July 17, Valuation method Fair value method 2023 (in share) 17th grant Grant date June 15, 2023, Oct 17, 2023 Grantee CEO, internal directors, external directors, executives Vesting conditions Service condition: 1 year Non-market performance condition: achievement of performance Fair value per option (in Korean won) ￦ Total compensation costs (in Korean won) ￦ Estimated exercise date (exercise date) During 2024 Valuation method Fair value method
Summary of Changes in the Number of Stock Options and the Weighted-Average Exercise Price	(2) Changes in the number of stock options and the weighted-average exercise price as at December 31, 2022 and 2023, are as follows: (In share) 2022 Beginning Grant Expired Exercised 1 Ending Number of 15th grant 284,209 —  (155,286 ) (128,923 ) —  —  16th grant —  258,509 —  —  258,509 —  Total 284,209 258,509 (155,286 ) (128,923 ) 258,509 —  (In share) 2023 Beginning Grant Expired Exercised 1 Ending Number of 16th grant 258,509 —  (105,859 ) (131,690 ) 20,960 —  17th grant —  307,182 —  —  307,182 —  Total 258,509 307,182 (105,859 ) (131,690 ) 328,142 —  1 The weighted average price of ordinary shares at the time of exercise, during the year ended December 31, 2023 is ￦ ￦

Revenue from Contracts with C_2

Revenue from Contracts with Customers, Other Income and Relevant Contract Assets and Liabilities (Tables)	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
Detail Explanation of Revenue And Other Income in the consolidated Statement of operations	(1) The Group has recognized the following amounts relating to revenue and other income in the statement of profit or loss: (in millions of Korean won) 2021 2022 2023 Revenue from contracts with customers ￦ 24,712,128 ￦ 25,432,727 ￦ 26,063,185 Revenue from other sources 185,877 206,128 224,016 Other income (Note 26) 307,654 595,351 308,044 Total revenue and other income ￦ 25,205,659 ￦ 26,234,206 ￦ 26,595,245
Detail Explanation of Operating Revenues And Other Income	(2) Operating revenues and other income for the years ended December 31, 2021, 2022 and 2023 are as follows: (in millions of Korean won) 2021 2022 2023 Mobile services ￦ 6,936,485 ￦ 7,013,889 ￦ 7,140,333 Fixed-line services 4,960,338 5,056,513 5,142,359 Fixed-line and VoIP telephone services 1,465,059 1,378,265 1,249,024 Broadband Internet access services 2,343,591 2,504,833 2,578,558 Data communication services 1,151,689 1,173,415 1,314,777 Media and content 2,800,630 3,099,776 3,206,521 Financial services 3,661,896 3,836,589 3,967,763 Sale of goods 3,532,973 3,393,646 3,292,514 Others 3,313,337 3,833,793 3,845,755 Total ￦ 25,205,659 ￦ 26,234,206 ￦ 26,595,245
Detail Analysis of Contract with Customer Assets and Liabilities	(3) Contract assets and liabilities recognized in relation to the revenues from contracts with customers, are as follows: (in millions of Korean won) December 31, December 31, Contract assets 1 ￦ 963,133 ￦  1,130,745 Contract liabilities 1   344,869 311,023 Deferred revenue 2 ￦ 81,653 ￦ 81,067 1 The Group recognized contract assets of ￦ ￦ ￦ ￦ 2 Deferred revenue recognized relating to government grant is excluded.
Detail Analysis of Contract Costs Recognized as Assets	(4) The contract costs recognized as assets are as follows: (in millions of Korean won) 2021 2022 2023 Incremental cost of contract establishment ￦ 1,726,401 ￦ 1,744,096 ￦ 1,656,711 Cost of Contract performance 74,843 73,582 70,757
Detail of Revenue Arising from Carried-Forward Contract Liabilities	(5) The recognized revenue arising from carried-forward contract liabilities from prior year is as follows: (in millions of Korean won) 2021 2022 2023 Revenue recognized that was included in the contract liabilities balance at the beginning of the year Allocation of the transaction price ￦ 275,965 ￦ 246,843 ￦ 213,609 Deferred revenue of joining/installment fee 42,100 44,204 41,824 Total ￦ 318,065 ￦ 291,047 ￦ 255,433

Other Income (Tables)

Other Income (Tables)	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
Summary Of Other Income	Other income for the years ended December 31, 2021, 2022 and 2023, are as follows: (in millions of Korean won) 2021 2022 2023 Gains on disposal of property and equipment and investment properties ￦ 54,007 ￦ 52,603 ￦ 22,447 Gains on disposal of intangible assets 1,726 622 1,727 Gain on disposal of right-of-use assets 3,138 3,326 3,580 Property and Equipment loss recovery income 148,927 159,849 152,712 Income from 43,822 44,473 40,725 Gain on disposal of investments in associates 5 38,319 6,982 Gain on disposal of investments in subsidiaries 244 216,591 28,825 Others 1 55,785 79,568 51,046 Total ￦ 307,654 ￦ 595,351 ￦ 308,044 1 Certain amounts that were previously reported in the table above have been grouped as Others.

Operating Expenses (Tables)

Operating Expenses (Tables)	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
Summary of Operating Expenses	(1) Operating expenses for the years ended December 31, 2021, 2022 and 2023, are as follows: (in millions of Korean won) 2021 2022 2023 Employee benefit cost ￦ 4,215,810 ￦ 4,495,885 ￦ 4,556,832 Depreciation 2,605,594 2,637,463 2,723,610 Depreciation of right-of-use assets 398,716 396,214 402,737 Amortization of intangible assets 603,327 622,202 683,784 Commissions 1,125,944 1,295,434 1,264,729 Interconnection charges 507,567 479,500 436,598 International interconnection fee 192,008 186,253 140,433 Purchase of inventories 3,753,792 3,656,040 3,595,345 Changes of inventories 20,491 (195,046 ) (203,071 ) Sales commission 2,343,375 2,353,909 2,353,318 Service cost 1 2,296,324 2,334,386 2,229,709 Utilities 364,373 368,348 544,675 Taxes and dues 268,651 276,962 250,651 Rent 123,246 160,848 167,576 Insurance premium 66,717 68,245 66,737 Installation fee 154,542 150,140 174,238 Advertising expenses 171,400 195,519 153,750 Allowance for bad debts 82,329 115,358 150,549 Card service cost 3,114,047 3,127,673 3,189,376 Loss on disposal of property and equipment 71,417 81,415 72,710 Loss on disposal of intangible assets 3,885 7,015 5,328 Loss on disposal of right-of-use assets 11,457 2,348 2,115 Loss on disposal of investments in subsidiaries 13,727 —  —  Impairment loss on property and equipment 2,115 16,094 7,871 Impairment loss on intangible assets 3,747 30,965 236,206 Donations 10,981 15,642 24,664 Other allowance for bad debts 28,066 17,551 34,112 Others 952,614 1,369,686 1,902,214 Total ￦ 23,506,262 ￦ 24,266,049 ￦ 25,166,796
Summary of Details of Salaries and Wages	(2) Details of employee benefit cost for the years ended December 31, 2021, 2022 and 2023, are as follows: (in millions of Korean won) 2021 2022 2023 Salaries & Wages ￦  3,837,359 ￦  4,161,874 ￦  4,231,781 Post-employment benefits(Defined benefit plan) 236,831 225,404 183,026 Post-employment benefits(Defined contribution plan) 71,068 72,576 85,174 Share-based payment 47,415 16,799 15,450 Others 23,137 19,232 41,401 Total ￦ 4,215,810 ￦ 4,495,885 ￦ 4,556,832

Financial Income and Costs (Tab

Financial Income and Costs (Tables)	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
Summary of Details of Financial Income	(1) Details of financial income for the years ended December 31, 2021, 2022 and 2023, are as follows: (in millions of Korean won) 2021 2022 2023 Interest income ￦ 273,460 ￦ 271,925 ￦ 279,607 Gain on foreign currency transactions 19,976 67,976 27,407 Gain on foreign currency translation 32,768 43,092 11,944 Gain on derivative transactions 2,215 50,668 12,304 Gain on valuation of derivatives 255,149 182,998 49,881 Gain on disposal of trade receivables —  —  3,441 Gain on valuation of financial instruments 90,653 31,032 32,477 Others 52,062 42,737 69,216 Total ￦ 726,283 ￦ 690,428 ￦ 486,277
Summary of Details of Financial Costs	(2) Details of financial costs for the years ended December 31, 2021, 2022 and 2023, are as follows: (in millions of Korean won) 2021 2022 2023 Interest expenses ￦ 263,389 ￦ 293,854 ￦ 356,345 Loss on foreign currency transactions 13,105 81,171 34,281 Loss on foreign currency translation 213,689 200,109 95,730 Loss on derivative transactions 6,287 24,331 417 Loss on valuation of derivatives 15,947 21,601 6,598 Loss on disposal of trade receivables 22,712 62,697 17,980 Loss on valuation of financial instruments 25,994 65,660 55,049 Others 2,207 485 2,282 Total ￦ 563,330 ￦ 749,908 ￦ 568,682

Deferred Income Tax and incom_2

Deferred Income Tax and income Tax Expense (Tables)	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
Summary of Analysis of Deferred Tax Assets and Deferred Tax Liabilities	(1) The analysis of deferred tax assets and deferred tax liabilities as at December 31, 2022 and 2023, is as follows: (in millions of Korean won) December 31, December 31, Deferred tax assets Deferred tax assets to be recovered within 12 months ￦ 398,710 ￦ 404,234 Deferred tax assets to be recovered after more than 12 months 1,907,690 1,824,099 Deferred tax assets before offsetting 2,306,400 2,228,333 Deferred tax liabilities Deferred tax liabilities to be recovered within 12 months (586,522 ) (491,817 ) Deferred tax liabilities to be recovered after more than 12 months (2,108,438 ) (2,116,346 ) Deferred tax liabilities before offsetting (2,694,960 ) (2,608,163 ) Deferred tax assets after offsetting ￦ 579,090 ￦ 614,500 Deferred tax liabilities after offsetting ￦ 967,650 ￦ 994,330
Summary of Movement in Deferred Income Tax Assets and Liabilities	(2) The movement in deferred income tax assets and liabilities during the year, without taking into consideration the offsetting of balances within the same tax jurisdiction, is as follows: (in millions of Korean won) 2022 Beginning Statement of Other Ending Deferred tax liabilities Investments in subsidiaries, associates and joint ventures (240,633 ) (18,299 ) 3,748 (255,184 ) Depreciation and impairment loss (88,588 ) (62,845 ) —  (151,433 ) Plan assets (538,928 ) (5,294 ) 1,322 (542,900 ) Advanced depreciation provision (339,005 ) (182,934 ) —  (521,939 ) Contract assets (493,917 ) 69,615 —  (424,302 ) Financial assets at fair value through profit or loss (336 ) (73 ) (11 ) (420 ) Financial assets at fair value through other comprehensive income (47,521 ) (71,396 ) 58,288 (60,629 ) Others (623,744 ) (111,135 ) (3,274 ) (738,153 ) Total ￦ (2,372,672 ) ￦ (382,361 ) ￦ 60,073 ￦ (2,694,960 ) Deferred tax assets Depreciation and impairment loss 225,821 (36,989 ) —  188,832 Contract liabilities 148,454 (27,165 ) —  121,289 Defined benefit liabilities 571,336 (22,423 ) (67,055 ) 481,858 Provisions 172,871 (20,894 ) (22 ) 151,955 Others 899,543 351,317 8,635 1,259,495 Total ￦ 2,018,025 ￦ 243,846 ￦ (58,442 ) ￦ 2,203,429 Temporary difference, net (354,647 ) (138,515 ) 1,631 (491,531 ) Tax credit carryforwards 134,417 (31,446 ) —  102,971 Total net balance ￦ (220,230 ) ￦ (169,961 ) ￦ 1,631 ￦ (388,560 ) (in millions of Korean won) 2023 Beginning Statement of Other Ending Deferred tax liabilities Investments in subsidiaries, associates and joint ventures (255,184 ) (7,821 ) (7,225 ) (270,230 ) Depreciation and impairment loss (151,433 ) 39,309 —  (112,124 ) Plan assets (542,900 ) 8,367 826 (533,707 ) Advanced depreciation provision (521,939 ) 3,859 —  (518,080 ) Contract assets (424,302 ) 2,478 —  (421,824 ) Financial assets at fair value through profit or loss (420 ) 461 43 84 Financial assets at fair value through other comprehensive income (60,629 ) (53 ) (41,945 ) (102,627 ) Others (738,153 ) 90,876 (2,378 ) (649,655 ) Total ￦ (2,694,960 ) ￦ 137,476 ￦ (50,679 ) ￦ (2,608,163 ) Deferred tax assets Depreciation and impairment loss 188,832 (71,689 ) (397 ) 116,746 Contract liabilities 121,289 (9,311 ) —  111,978 Defined benefit liabilities 481,858 (6,705 ) 40,838 515,991 Provisions 151,955 (5,784 ) —  146,171 Others 1,259,495 (53,459 ) 2,141 1,208,177 Total ￦ 2,203,429 ￦ (146,948 ) ￦ 42,582 ￦ 2,099,063 Temporary difference, net (491,531 ) (9,472 ) (8,097 ) (509,100 ) Tax credit carryforwards 102,971 26,299 —  129,270 Total net balance ￦ (388,560 ) ￦ 16,827 ￦ (8,097 ) ￦ (379,830 )
Summary of Tax Impacts Recognized Directly To Equity	(3) The tax impacts recognized directly to equity as of December 31, 2021, 2022, and 2023, are as follows: December 31, 2021 December 31, 2022 December 31, 2023 (in millions of Korean won) Before recognition Tax effect After Before recognition Tax effect After Before recognition Tax effect After Gain (loss) on valuation of financial assets at fair value through other comprehensive income ￦ 163,892 ￦ (34,112 ) ￦ 129,780 ￦ (216,862 ) ￦ 58,288 ￦ (158,574 ) ￦ 163,750 ￦ (41,945 ) ￦ 121,805 Gain (loss) on valuation of hedge instruments 6,916 (1,644 ) 5,272 (42,510 ) 11,180 (31,330 ) (30,168 ) 7,555 (22,613 ) Remeasurements of net defined benefit liabilities 74,518 (18,696 ) 55,822 247,162 (65,733 ) 181,429 (179,129 ) 41,664 (137,465 ) Share of gain (loss) of associates and joint ventures, and others (34,909 ) 9,097 (25,812 ) (14,931 ) 3,748 (11,183 ) 28,715 (7,225 ) 21,490 Exchange differences on translation for foreign operations 683 (178 ) 505 23,316 (5,852 ) 17,464 32,376 (8,146 ) 24,230 Gain or loss on disposal of treasury stock (15,657 ) 4,080 (11,577 ) (59,308 ) 14,886 (44,422 ) 402 (101 ) 301 Total ￦ 195,443 ￦ (41,453 ) ￦ 153,990 ￦ (63,133 ) ￦ 16,517 ￦ (46,616 ) ￦ 15,946 ￦ (8,198) ￦ 7,748
Summary of Details of Income Tax Expense	(4) Details of income tax expense for the years ended December 31, 2021, 2022 and 2023, are calculated as follows: (in millions of Korean won) 2021 2022 2023 Current income tax expense ￦ 289,471 ￦ 335,796 ￦ 347,265 Impact of change in deferred taxes 229,545 169,961 (16,827 ) Income tax expense ￦ 519,016 ￦ 505,757 ￦ 330,438
Summary of Tax on the Group's Profit Before Tax	(5) The tax on the Group’s profit before tax differs from the theoretical amount that would arise using the weighted average tax rate applicable to profits of the entities as follows: (in millions of Korean won) 2021 2022 2023 Profit before income tax expense ￦ 1,978,411 ￦ 1,891,392 ￦ 1,302,620 Statutory income tax expense ￦ 533,701 ￦ 509,771 ￦ 333,530 Tax effect Income not taxable for taxation purposes (4,307 ) (47,550 ) (30,106 ) Non-deductible expenses 20,570 53,398 26,723 Tax credit (31,517 ) (54,895 ) (78,459 ) Additional payment of income taxes (221 ) 11,744 (4,991 ) Adjustments in deferred tax from changes in tax rate —  (41,545 ) 564 Tax effect and adjustment on consolidation Goodwill impairment —  5,809 106,010 Eliminated dividend income form subsidiaries 7,264 —  —  Changes of out-side tax effect 4,738 29,922 4,436 Intangible Asset impairment and amortization 796 5,276 5,892 Reversal expenses of contract cost assets (2,932 ) (4,800 ) 9,281 Acquisition and disposition of businesses (5,128 ) —  —  Others (3,948 ) 38,627 (42,442 ) Income tax expense ￦ 519,016 ￦ 505,757 ￦ 330,438
Summary of deferred tax assets and liabilities that are not recognized	(6) Details of deferred tax assets and liabilities that are not recognized as at December 31, 2022 and 2023, are as follows: (in millions of Korean won) 2022 2023 Deductible temporary differences Investment in subsidiaries, associates, and joint ventures ￦ 3,384,295 ￦ 3,520,173 Unused tax loss 103,326 203,200 Unused Tax credit 1,988 2,338 Others 387,084 437,238 Total ￦ 3,876,693 ￦ 4,162,949 Taxable temporary differences Investment in subsidiaries, associates, and joint ventures ￦ 857,076 ￦ 903,394 Others 216,660 211,201 Total ￦ 1,073,736 ￦ 1,114,595
Summary of expected period of expiry for unused tax losses not recognized in deferred tax assets	(7) The expected period of expiry for unused tax losses not recognized in deferred tax assets as of December 31, 2022 and 2023, is as follows: (in millions of Korean won) 2022 2023 2023 ￦  72,512 ￦   4,484 2024 5,011 2,836 2025 3,701 2,086 2026 2,112 4,541 2027 2,534 2,473 2028 396 6,533 2029 617 743 2030 2,198 713 2031 1,360 756 2032 7,450 —  Atter 2033 5,435 178,035 Total ￦ 103,326 ￦ 203,200

Earnings per Share (Tables)

Earnings per Share (Tables)	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
Summary of Basic and Diluted Earnings per Share From Operations	(1) Basic Earnings per Share Basic earnings per share is calculated by dividing the profit from operations attributable to equity holders of the Group by the weighted average number of ordinary shares outstanding during the period, excluding ordinary shares purchased by the Group and held as treasury stock. Basic earnings per share from operations for the years ended December 31, 2021, 2022 and 2023, is calculated as follows: 2021 2022 2023 Profit attributable to ordinary shares of owners of the Controlling Company (in millions of Korean won) ￦ 1,354,537 ￦ 1,259,686 ￦ 993,325 Weighted average number of ordinary shares outstanding (in number of shares) 235,201,782 242,235,332 249,470,072 Basic earnings per share (in Korean won) ￦ 5,759 ￦ 5,200 ￦ 3,982 Diluted earnings per share from operations is calculated by adjusting the weighted average number of ordinary shares outstanding to assume conversion of all dilutive potential ordinary shares. The Group compensat ion (2) Diluted Earnings per Share Diluted earnings per share from operations is calculated by adjusting the weighted average number of ordinary shares outstanding assuming that all dilutive potential ordinary shares are converted into ordinary shares. The Group has dilutive potential ordinary shares from convertible bonds, convertible preferred stock and other share-based payments: 2021 2022 2023 Profit attributable to ordinary shares of owners of the Controlling Company (in millions of Korean won) ￦ 1,354,537 ￦ 1,259,686 ￦ 993,325 Adjustment to net income attributable to ordinary shares (in millions of Korean won) — (496 ) (827 ) Diluted profit attributable to ordinary shares (in millions of Korean won) 1,354,537 1,259,190 992,498 Number of dilutive potential ordinary shares outstanding (in number of shares) 483,760 91,931 119,263 Weighted average number of ordinary shares outstanding (in number of shares) 235,685,542 242,327,263 249,589,335 Diluted earnings per share (in Korean won) ￦ 5,747 ￦ 5,196 ￦ 3,977 Diluted earnings per share is earnings per outstanding of ordinary shares and dilutive potential ordinary shares. Diluted earnings per share is calculated by dividing adjusted profit for the year by the sum of the number of ordinary shares and dilutive potential ordinary shares. Convertible bonds and convertible preferred stocks without dilutive effects are excluded from the calculation.

Cash Generated from Operations

Cash Generated from Operations (Tables)	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
Summary of Cash Flows from Operating Activities	(1) Cash flows from operating activities for the years ended December 31, 2021, 2022 and 2023, are as follows: (in millions of Korean won) 2021 2022 2023 1. Profit for the year ￦ 1,459,395 ￦ 1,385,635 ￦ 972,182 2. Adjustments to reconcile net income Income tax expense 519,016 505,757 335,367 Interest income 1 (300,900 ) (340,794 ) (392,580 ) Interest expense 1 268,847 320,914 410,566 Dividends income 2 (21,525 ) (14,121 ) (59,758 ) Depreciation 2,643,894 2,687,191 2,773,152 Amortization of intangible assets 604,744 627,261 691,909 Depreciation of right-of-use assets 398,716 396,214 402,737 Provision for severance benefits (defined benefits) 253,491 240,506 196,027 Impairment losses on trade receivables 105,344 132,102 175,244 Share of net profit or loss of associates and joint ventures (116,061 ) 16,821 44,323 Loss(gain) on disposal of associates and joint ventures 1 (38,024 ) (6,982 ) Loss(gain) on the disposal of subsidiaries 13,483 (216,591 ) (28,825 ) Loss(gain) on disposal of right-of-use assets 8,319 (978 ) (1,465 ) Impairment losses on assets held for sale 11 —  —  Impairment loss on property and equipment and investment in properties 2,115 16,094 7,871 Loss (gain) 3 17,410 (66,317 ) 511 Loss on disposal of intangible assets 2,159 6,393 3,601 Loss on impairment of intangible assets 3,747 30,674 236,106 Loss on foreign currency translation 180,921 157,017 83,899 G (235,130 ) (205,381 ) (37,249 ) Gain (29,974 ) (2,347 ) (2,225 ) Loss(Gain) on valuation of financial assets at fair value through profit or loss (64,660 ) 44,833 13,920 Loss(gain) on disposal of financial assets at amortized cost 4 (35 ) 3 1 Others 84,625 (49,891 ) 158,820 3. Change in operating assets and liabilities, net of effects from purchase of controlled entity and sale of engineering division Decrease(increase) in trade receivables 327,031 (43,787 ) (124,023 ) Increase in other receivables (328,610 ) (1,598,216 ) (1,085,527 ) Decrease(increase) in other current assets (89,230 ) (101,947 ) 250,569 I (143,087 ) (120,054 ) (86,030 ) Decrease(increase) in inventories 32,798 (179,255 ) (317,531 ) Increase(decrease) in trade payables 289,044 (368,355 ) 121,515 Increase in other payables 207,583 1,103,113 829,220 Increase(decrease) in other current liabilities 107,993 (30,375 ) 414,436 Decrease in other non-current liabilities (14,915 ) (1,015 ) (14,272 ) Decrease in provisions (4,668 ) (22,115 ) (5,083 ) Increase(decrease) in deferred revenue 3,696 (384 ) 905 Decrease(increase) in plan assets (114,631 ) (90,771 ) 115,725 Payment of post-employment benefits (241,350 ) (343,931 ) (329,861 ) 4. Cash generated from operations (1+2+3) ￦ 5,829,607 ￦ 3,835,879 ￦ 5,747,195 1 BC Card CO., Ltd. and other subsidiaries of the Group recognize interest income and expense as operating revenue and expense, respectively, including interest income of ￦ ￦ ￦ ￦ ￦ ￦ 2 BC Card Co., Ltd. Recognized dividend income as operating revenue, including dividend income of ￦ ￦ ￦ 3 KT Estate Inc. recognized gain and loss on disposal of investment properties as operating revenue and expense, respectively, including gain on disposal of investment properties of ￦ 4 KT Investment CO., Ltd. and other subsidiaries of the Group recognized gain and loss on valuation of financial assets at fair value through profit or loss as operating revenue and expense, respectively, including loss on valuation of financial assets at fair value through profit or loss of ￦
Summary of Significant Transactions not Affecting Cash Flows	(2) Significant transactions not affecting cash flows for the years ended December 31, 2021, 2022 and 2023, are as follows: (in millions of Korean won) 2021 2022 2023 Reclassification of the current portion of borrowings ￦ 1,303,543 ￦ 1,004,818 ￦ 1,731,998 Reclassification of construction-in-progress to property and equipment 2,916,888 3,167,965 3,123,611 Reclassification of accounts payable from property and equipment (149,512 ) (7,055 ) (293,448 ) Reclassification of accounts payable from intangible assets 524,040 (197,389 ) (276,491 ) Reclassification of payable from defined benefit liabilities 69,415 (32,417 ) 26,246 Reclassification of payable from plan assets (60,320 ) 28,532 (24,821 ) Disposal of treasury stock related to acquisition of financial assets —  747,161 —  Acquisition of financial assets related to disposal of a subsidiary —  250,000 —

Changes in Liabilities Arisin_2

Changes in Liabilities Arising from Financing Activities (Tables)	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
Summary of Changes in Liabilities Arising from Financial Activities	Details of changes in liabilities arising from financing activities, liabilities related to cashflow to be classified as future financing activities, for the years ended December 31, 2021, 2022 and 2023, are as follows: (in millions of Korean won) 2021 Beginning Cash flows Non-cash Ending Newly Changes in Fair Value Acquisition Others Borrowing ￦ 7,316,298 ￦ 900,394 ￦ 52,782 ￦ 196,890 ￦ —  ￦ 15,994 ￦ (44,655) ￦ 8,437,703 Lease liabilities 1,143,640 (394,567 ) 403,451 3 90 36,840 (30,088) 1,159,369 Derivative liabilities 130,573 (1,712 ) 2,637 (4,311) (4,892) —  (47,119) 75,176 Derivative assets (7,606 ) 216 —  (189,700) (17,251) —  114,888 (99,453 ) Total ￦ 8,582,905 ￦ 504,331 ￦ 458,870 ￦ 2,882 ￦ (22,053) ￦ 52,834 ￦ (6,974 ) ￦ 9,572,795 (in millions of Korean won) 2022 Beginning Cash flows Non-cash Ending Newly Changes in Fair Value Acquisition Others Borrowing ￦ 8,437,703 ￦ 1,391,321 ￦ —  ￦ 146,108 ￦ 939 ￦ —  ￦ 30,614 ￦ 10,006,685 Lease liabilities 1,159,369 (378,684 ) 427,398 —  —  —  (36,045) 1,172,038 Derivative liabilities 75,176 (41,197 ) —  19,858 12,941 —  (33,223) 33,555 Derivative assets (99,453 ) 76,280 (754 ) (147,161) 30,341 —  (50,083) (190,830 ) Total ￦ 9,572,795 ￦ 1,047,720 ￦ 426,644 ￦ 18,805 ￦ 44,221 ￦ — ￦ (88,737) ￦ 11,021,448 (in millions of Korean won) 2023 Beginning Cash flows Non-cash Ending Newly Changes in Fair value Acquisition Others Borrowing ￦ 10,006,685 ￦ 106,118 ￦ —  ￦ 45,370 ￦ 1,719 ￦ —  ￦ 58,273 ￦ 10,218,165 Lease liabilities 1,172,038 (407,051 ) 460,617 —  24 —  (45,719) 1,179,909 Derivative liabilities 33,555 —  —  10,888 9,643 —  (29,539) 24,547 Derivative assets (190,830 ) 48,183 —  32,487 1,788 —  (50,839 ) (159,211 ) Total ￦ 11,021,448 ￦ (252,750) ￦ 460,617 ￦ 88,745 ￦ 13,174 ￦ — ￦ (67,824) ￦ 11,263,410

Segment Information (Tables)

Segment Information (Tables)	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
Summary of Segment Information	(2) Details of each segment for the years ended December 31, 2021, 2022 and 2023, are as follows: 2021 (in millions of Korean won) Operating revenues Operating Income Depreciation 1 ICT ￦ 18,734,342 ￦ 1,170,920 ￦ 3,217,643 Finance 3,526,743 104,511 46,223 Satellite TV 665,081 61,398 60,980 Real estate 336,218 27,498 60,459 Others 6,474,858 390,903 327,202 Total 29,737,242 1,755,230 3,712,507 Elimination 2 (4,531,583 ) (55,833 ) (104,869 ) Consolidated amount ￦ 25,205,659 ￦ 1,699,397 ￦ 3,607,638 2022 (in millions of Korean won) Operating revenues Operating Income Depreciation and Amortization 1 ICT ￦ 18,697,269 ￦ 1,347,405 ￦ 3,105,807 Finance 3,615,307 119,805 47,638 Satellite TV 709,160 19,797 58,413 Real estate 474,954 113,134 65,457 Others 7,960,143 473,276 575,035 T otal 31,456,833 2,073,417 3,852,350 Elimination 2 (5,222,627 ) (105,260 ) (196,471 ) Consolidated amount ￦ 26,234,206 ￦ 1,968,157 ￦ 3,655,879 2023 (in millions of Korean won) Operating revenues Operating Income Depreciation and Amortization 1 ICT ￦ 18,698,964 ￦ 1,193,333 ￦ 3,183,408 Finance 3,723,286 91,591 37,150 Satellite TV 714,574 (70,170 ) 52,871 Real estate 499,997 73,496 70,653 Others 8,145,272 97,568 584,738 Total 31,782,093 1,385,818 3,928,820 Elimination 2 (5,186,848 ) 42,631 (118,689 ) Consolidated amount ￦ 26,595,245 ￦ 1,428,449 ￦ 3,810,131 1 Sum of the amortization of tangible assets, intangible assets, investment properties, and right-of-use assets. 2 Elimination for operating revenues is the difference between operating revenue included in the CODM report, which is based on Korean IFRS and operating revenue based on IFRS. Elimination for depreciation and amortization and operating revenues also included consolidated adjustments due to intercompany transactions with the group.
Summary of Operating Revenues and Non Current Assets by Geographical Regions	(3) Operating revenues for the years ended December 31, 2021, 2022 and 2023 and non-current assets as at December 31, 2022 and 2023 by geographical regions, are as follows: (In millions of Korean won) Operating revenues Non-current assets 1 Location 2021 2022 2023 2022.12.31 2023.12.31 Domestic ￦ 25,114,719 ￦ 26,074,349 ￦ 26,425,735 ￦ 20,845,214 ￦ 20,725,694 Overseas 90,940 159,857 169,510 270,490 183,344 Total ￦ 25,205,659 ￦ 26,234,206 ￦ 26,595,245 ￦ 21,115,704 ￦ 20,909,038 1 Sum of property and equipment, intangible assets, investment properties and right-of-use assets.

Related Party Transactions (Tab

Related Party Transactions (Tables)	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
Summary of Related Parties Outstanding Balances of Receivables and Payables	(2) Outstanding balances of receivables and payables in relations to transactions with related parties as of December 31, 2022 and 2023, are as follows: December 31, 2022 Receivables Payables (in millions of Korean won) Trade Other Trade Other Lease Associates and joint ventures K Bank, Inc. ￦ 682 ￦ 258,999 ￦ —  ￦ 299 ￦ —  Little Big Pictures 1,454 7,645 —  9 —  K-Realty 11th Real Estate Investment Trust Company 151 1,283 —  —  8,824 Others 2,285 2 3,235 2,932 —  Total ￦ 4,572 ￦ 267,929 ￦ 3,235 ￦ 3,240 ￦ 8,824 December 31, 2023 Receivables Payables (in millions of Korean won) Trade Other Lease receivables Trade Other Lease liabilities Associates and joint ventures K Bank, Inc. ￦ 862 ￦ 326,006 ￦ 769 ￦ —  ￦ 299 ￦ —  Little Big Pictures 232 3,473 —  9 6 —  K-Realty 11th Real Estate Investment Trust Company 110 1,283 —  —  —  6,732 K-Realty No.3 Real Estate General Private Placement Investment Company 4,576 —  —  —  —  —  Others 2,044 162 —  2,900 3,029 —  Total ￦ 7,824 ￦ 330,924 ￦ 769 ￦ 2,909 ￦ 3,334 ￦ 6,732
Summary of Significant Transactions With Related Parties	2021 (in millions of Korean won) Sales Purchases 1 Associates and joint ventures K- Realty CR-REITs No.1 ￦ 238,847 ￦ 1,308 IGIS Professional Investors Private Investment Real Estate Investment LLC No. 395 5,000 —  K Bank, Inc. 24,247 15,164 Others 2,3 28,092 21,302 Total 296,186 37,774 2021 (in millions of Korean won) Interest Interest Dividend Associates and joint ventures K- Realty CR-REITs No.1 ￦ ￦ ￦ Korea Information & Technology Investment Fund (KIF Investment Fund) 223 —  —  K Bank, Inc. —  —  —  Others 2,3 —  —  8,637 Total ￦ 223 ￦ 205 ￦ 48,779 1 Amounts include acquisition of property and equipment, and others. 2 Transaction amount before OSKENT Co., Ltd., Mission Culture Industry Limited, Sweet and Sour Culture Industry Limited, Alma Mater Culture Industry Limited, and KT Philippines are excluded from associates and joint ventures. 3 Includes transactions of Oscar Ent. before it was excluded as associates and joint ventures of the Group. 2022 (in millions of Korean won) Operating Purchases 1 Associates and joint ventures K- Realty CR-REITs No.1 2 ￦ —  ￦ —  K Bank, Inc. 29,536 11,007 Hyundai Robotics Co., Ltd. 1 94 3,799 K-Realty 11th Real Estate Investment Trust Company 330 1,674 Others 3 11,964 37,742 Others Digital Pharm Co., Ltd. 1 —  Total 41,925 54,222 2022 (in millions of Korean won) Acquisition of Interest Interest Dividend Associates and joint ventures K- Realty CR-REITs No.1 2 ￦ —  ￦ —  ￦ —  ￦ 45,549 K Bank, Inc. —  3,052 —  —  Hyundai Robotics Co., Ltd. 1 —  —  —  —  K-Realty 11th Real Estate Investment Trust Company 1,966 —  260 162 Others 3 —  —  —  9,158 Total ￦ 1,966 ￦ 3,052 ￦ 260 ￦ 54,869 1 Amounts include acquisition of property and equipment, and others. 2 Includes transactions of the entity before it was excluded as an associate and joint venture of the Group. 3 Includes transactions of StorySoop Inc. before it was excluded as associates and joint ventures of the Group. 2023 (in millions of Korean won) Operating Purchases 1 Associates and joint ventures K Bank, Inc. ￦ 22,701 ￦ 13,429 HD Hyundai Robotics Co., Ltd. (formerly Hyundai Robotics Co., Ltd.) 78 182 K-Realty 11th Real Estate Investment Trust Company 346 2,559 K-Realty No.3 Real Estate General Private Placement Investment Company 6,216 —  Others 2 3 21,308 42,169 Others Digital Pharm Co., Ltd. 1 —  Total 50,650 58,339 2023 (in millions of Korean won) Acquisition of Interest Interest Dividend Associates and joint ventures K Bank, Inc. ￦ —  ￦ 8,264 ￦ —  ￦ —  HD Hyundai Robotics Co., Ltd.(formerly Hyundai Robotics Co., Ltd.) —  —  —  —  K-Realty 11th Real Estate Investment Trust Company 7 —  261 507 Others 2 3 —  —  —  1,279 Total ￦ 7 ￦ 8,264 ￦ 261 ￦ 1,786 1 Amounts include acquisition of property and equipment, and others. 2 Includes transactions of KD Living Co., Ltd. before it was included as a subsidiary. 3 Includes transactions of FUNDA Co., Ltd, Maruee Limited Company Specializing in the Cultural Industry, Mastern No.127 Logispoint Daegu Co., Ltd. before it was excluded as associates and joint ventures of the Group.
Summary of Key Management Compensation	(4) Key management compensation for the years ended December 31, 2021, 2022 and 2023, consists of: (in millions of Korean won) 2021 2022 2023 Salaries and other short-term benefits ￦ 2,189 ￦ 1,855 ￦ 1,494 Post-employment benefits 412 294 153 Share-based compensation 669 976 569 Total ￦ 3,270 ￦ 3,125 ￦ 2,216
Summary of Fund Transactions With Related Parties	(5) Fund transactions with related parties for the years ended December 31, 2021, 2022 and 2023, are as follows: 2021 (in millions of Korean won) Borrowing transactions 1 Equity contributions Associates and joint ventures Borrowings Repayments K- REALTY CR REIT 1 ￦ —  ￦ 15,964 ￦ —  K Bank, Inc. —  —  424,957 Pacific Professional Investors Private Investment Real Estate Investment LLC No. 55 —  —  11,000 KT Young Entrepreneurs DNA Investment Fund —  —  8,400 Mastern KT Multi-Family Real Estate Private Equity Investment Fund 1 —  —  6,055 KT-IBKC Future Investment Fund 1 —  —  (5,700 ) Others 2 —  —  18,176 Total ￦ —  ￦ 15,964 ￦ 462,888 1 Borrowing transactions include lease transactions. 2 Others include transactions before exclusion as associates and joint ventures of the Group. 2022 (in millions of Korean won) Borrowing transactions 1 Equity Associates and joint ventures Borrowings Repayments Megazone Cloud Corporation ￦ 30,000 ￦ —  ￦ 130,001 IBK-KT Emerging Digital Industry Investment Fund —  —  10,800 Mastern KT Multi-Family Real Estate Private Equity Investment Fund 1 —  —  18,859 IGIS No. 468-1 General Private Real Estate Investment Company —  —  25,000 K-Realty 11th Real Estate Investment Trust Company 1,916 771 —  Others —  —  93,478 Total ￦ 31,916 ￦ 771 ￦ 278,138 1 Lease transactions are included in borrowing transactions. 2023 (in millions of Korean won) Borrowing transactions 1 Equity Associates and joint ventures Borrowings Repayments K-Realty 11th Real Estate Investment Trust Company ￦ —  ￦ 1,037 ￦ —  STIC Place General Private Placement Real Estate Investment Trust No.2 —  —  20,000 Telco Credit Bureau Co.,Ltd. —  —  6,500 Pacific geumto no.75 private hybrid asset fund —  —  19,000 Kiamco Data Center Blind Fund —  —  15,000 STIC Mixed Asset Investment Trust No.1 —  —  10,930 Others 2 —  —  31,107 Others Rebellions Co.,Ltd. —  —  19,998 Total ￦ —  ￦ 1,037 ￦ 122,535 1 Lease transactions are included in borrowing transactions. 2 Includes transaction details before Daemuga Limited Company Specializing in the Cultural Industry, Maruee Limited Company Specializing in the Cultural Industry were excluded from the associates company.

Financial Risk Management (Tabl

Financial Risk Management (Tables)	12 Months Ended
	Dec. 31, 2023
Statement [LineItems]
Summary of Maximum Exposure to Credit Risk	The maximum exposure to credit risk of the Group’s financial instruments without considering value of collaterals as o (in millions of Korean won) December 31, 2022 December 31, 2023 Cash and cash equivalents (except for cash on hand) ￦ 2,437,629 ￦ 2,869,285 Trade and other receivables Financial assets at amortized costs 7,459,994 8,458,259 Financial assets at fair value through other comprehensive income 129,124 116,198 Contract assets 802,253 832,520 Other financial assets Derivatives financial assets for hedging 190,830 159,211 Financial assets at fair value through profit or loss 942,274 880,549 Financial assets at fair value through other comprehensive income 5,432 5,913 Financial assets at amortized costs 1,060,058 1,385,921 Total ￦ 13,027,594 ￦ 14,707,856
Summary of Expected Credit Losses Reflect Forward-Looking Information	The expected credit losses reflect forward-looking information. Provision for impairment as of December 31, 2022 and 2023, are as follows: December 31, 2022 (in millions of Korean won) Less than 6 months 7-12 months More than 1 years Total Expected credit loss rate 5.57 % 25.84 % 67.16 % —  Total carrying amounts ￦ 3,443,163 ￦ 49,491 ￦ 207,396 ￦ 3,700,050 Provision for impairment ￦ (191,668 ) ￦ (12,789 ) ￦ (139,281 ) ￦ (343,738 ) December 31, 2023 (in millions of Korean won) Less than 6 months 7-12 More than 1 years Total Expected credit loss rate 5.43 % 21.72 % 54.55 % —  Total carrying amounts ￦ 3,466,588 ￦ 68,772 ￦ 235,129 ￦ 3,770,489 Provision for impairment ￦ (188,086 ) ￦ (14,940 ) ￦ (128,264 ) ￦ (331,290 )
Summary of Details of Changes in Provisions for Impairment of Trade Receivables and Other Financial Assets at Amortized Costs	1) Details of financial assets at fair value through profit or loss as of December 31, 2022 and 2023, are as follows: (in millions of Korean won) December 31, 2022 December 31, 2023 Equity Instruments (Listed) ￦ 26,647 ￦ 13,911 Equity Instruments (Unlisted) 72,517 42,185 Debt securities 942,274 880,549 Derivatives held for trading 1 23,418 3,016 Total 1,064,856 939,661 Less: non-current (609,887 ) (782,143 ) Current ￦ 454,969 ￦ 157,518 1 According to a derivative arrangement with LS Marine Solution Co., Ltd. (formerly KT Submarine Co., Ltd.), derivative assets amounting to ￦
Summary of Impairment of Trade Receivable	Impairment of trade receivable for the years ended December 31, 2022 and 2023, are as follows: (in millions of Korean won)  2022   2023  Impairment loss Bad debt expenses ￦ 64,522 ￦ 69,972
Summary of Contractual Undiscounted Cash Flows	These amounts are contractual undiscounted cash flows and can differ from the amount in the consolidated financial statements. December 31, 2022 (in millions of Korean won) Less than 1 year 1-5 years More than 5 years Total Trade and other payables ￦ 7,386,703 ￦ 1,009,559 ￦ 86,848 ￦ 8,483,110 Borrowings (including debentures) 2,028,207 6,972,077 2,016,472 11,016,756 Lease liabilities 313,162 615,766 407,833 1,336,761 Other non-derivative financial liabilities 33,279 209,155 93,744 336,178 Financial guarantee contracts 1 21,618 —  4,588 26,206 Total ￦ 9,782,969 ￦ 8,806,557 ￦ 2,609,485 ￦ 21,199,011 1 It is total amount guaranteed by the Group according to guarantee contracts. Cash flow from financial guarantee contracts is classified as the maturity group in the earliest period when the financial guarantee contracts can be executed. December 31, 2023 (in millions of Korean won) Less than 1 year 1-5 years More than 5 years Total Trade and other payables ￦ 8,184,036 ￦ 730,340 ￦ 8,040 ￦ 8,922,416 Borrowings (including debentures) 2,922,557 6,027,323 1,743,842 10,693,722 Lease liabilities 313,431 617,561 409,174 1,340,166 Other non-derivative financial liabilities 372,743 747,221 10,073 1,130,037 Financial guarantee contracts 1 13,719 103,000 —  116,719 Total ￦ 11,806,486 ￦ 8,225,445 ￦ 2,171,129 ￦ 22,203,060 1 It is total amount guaranteed by the Group according to guarantee contracts. Cash flow from financial guarantee contracts is classified as the maturity group in the earliest period when the financial guarantee contracts can be executed.
Summary of Cash Outflow and Inflow of Derivatives Settled Gross or Net are Undiscounted Contractual Cash Flow	At the end of the reporting period, the cash outflows and inflows by maturity of the Group’s derivatives held for trading and gross-settled derivatives are as follows: December 31, 2021 (in millions of Korean won) Less than 1 year 1-5 years More than Total Derivatives held for trading 1 Outflows ￦ —  ￦ 158,284 ￦ —  ￦ 158,284 Derivatives settled gross 2 Outflows ￦ 843,489 ￦ 1,857,942 ￦ 377,302 ￦ 3,078,733 Inflows 856,508 1,917,236 394,134 3,167,878 December 31, 2022 (in millions of Korean won) Less than 1 year 1-5 years More than Total Derivatives held for trading 1 Outflows ￦ —  ￦ 101,994 ￦ 930 ￦ 102,924 Derivatives settled gross 2 Outflows ￦ 472,005 ￦ 2,493,858 ￦  28,786 ￦ 2,994,649 Inflows 550,478 2,670,002 37,873 3,258,353 December 31, 2023 (in millions of Korean won) Less than 1 year 1-5 years More than Total Derivatives held for trading 1 Outflows ￦ —  ￦ 133,293 ￦ —  ￦ 133,293 Inflows —  —  1,015 1,015 Derivatives settled gross 2 Outflows ￦ 741,140 ￦ 1,227,166 ￦   8,126 ￦ 1,976,432 Inflows 614,066 2,198,958 36,344 2,849,368 1 During the year ended December 31, 2023, derivative liabilities held-for-trading are classified under the ‘more than one year to less than five years’ category as they are relevant to the fair value of derivatives liabilities related to shareholder-to-share contracts (Note 19). As these derivatives held-for-trading are managed based on net fair value, their contractual maturities are not necessarily taking into consideration to understand the timing of cash flows. 2 Cash outflow and inflow of gross-settled derivatives are undiscounted contractual cash flow and may differ from the amount in the consolidated statement of financial position.
Summary of Debt-to-equity Ratios	The debt-to-equity ratios as o (in millions of Korean won) December 31, 2022 December 31, 2023 Total liabilities ￦ 22,577,114 ￦ 24,249,073 Total equity 18,412,696 18,542,575 Debt-to-equity ratio 123 % 131 % The Group manages capital on the basis of the gearing ratio. This ratio is calculated as net debt divided by total capital. Net debt is calculated as total borrowings less cash and cash equivalents. Total capital is calculated as ‘equity’ in the statement of financial position plus net debt. The gearing ratios as of (in millions of Korean won, %) December 31, 2022 December 31, 2023 Total borrowings ￦ 10,006,685 ￦ 10,218,165 Less: cash and cash equivalents (2,449,062 ) (2,879,554 ) Net debt 7,557,623 7,338,611 Total equity 18,412,696 18,542,575 Total capital 25,970,319 25,881,186 Gearing ratio 29 % 28 %
Summary of Group's Recognized Financial Assets Subject to Enforceable Master Netting Arrangements or Similar Agreements	1) Details of the Group’s recognized financial assets subject to enforceable master netting arrangements or similar agreements are as follows: (in millions of Korean won) December 31, 2022 Gross assets Gross Net amounts Amounts not offset Net Financial Cash Trade receivables ￦ 60,512 ￦ —  ￦ 60,512 ￦ (44,518 ) ￦ —  ￦ 15,994 Other financial assets 764 (764 ) —  —  —  —  Total ￦ 61,276 ￦ (764 ) ￦ 65,012 ￦ (44,518 ) ￦ —  ￦ 15,994 (in millions of Korean won) December 31, 2023 Gross assets Gross Net amounts Amounts not offset Net Financial Cash Trade receivables ￦ 78,415 ￦ (1,407 ) ￦ 77,008 ￦ (59,148 ) ￦ —  ￦ 17,860 Other financial assets 759 (757 ) 2 (2 ) —  —  Total ￦ 79,174 ￦ (2,164 ) ￦ 77,010 ￦ (59,150 ) ￦ —  ￦ 17,860
Summary of Group's Recognized Financial Liabilities Subject to Enforceable Master Netting Arrangements or Similar Agreements	2) The Group’s recognized financial liabilities subject to enforceable master netting arrangements or similar agreements are as follows: (in millions of Korean won) December 31, 2022 Gross Gross offset Net amounts position Amounts not offset Net Financial Cash Trade payables ￦ 47,271 ￦ (764 ) ￦ 46,507 ￦ (44,518 ) ￦ —  ￦ 1,989 (in millions of Korean won) December 31, 2023 Gross Gross offset Net amounts position Amounts not offset Net Financial Cash Trade payables ￦ 59,602 ￦ (757 ) ￦ 58,845 ￦ (56,196 ) ￦ —  ￦ 2,649 Other financial assets 4,362 (1,407 ) 2,955 (2,955 ) —  —  Total ￦ 63,964 ￦ (2,164 ) ￦ 61,800 ￦ (59,151 ) ￦ —  ￦ 2,649
Trade receivables [member]
Statement [LineItems]
Summary of Details of Changes in Provisions for Impairment of Trade Receivables and Other Financial Assets at Amortized Costs	Details of changes in provisions for impairment of trade receivables the years ended December 31, 2022 and 2023, are as follows: (in millions of Korean won)  2022   2023  Beginning balance ￦ 349,725 ￦ 343,738 Provision 64,522 69,972 Written-off (68,298 ) (80,126 ) Others (2,211 ) (2,294 ) Ending balance ￦ 343,738 ￦ 331,290
Other Financial Assets At Amortized Cost [Member]
Statement [LineItems]
Summary of Details of Changes in Provisions for Impairment of Trade Receivables and Other Financial Assets at Amortized Costs	Details of changes in provisions for impairment of other financial assets at amortized costs for the years ended December 31, 2022 and 2023, are as follows: (in millions of Korean won)  2022   2023  Beginning balance ￦ 201,387 ￦ 218,543 Provision 65,941 114,501 Written-off (51,383 ) (150,014 ) Reversal (850 ) (14,941 ) Others 3,448 15,547 Ending balance ￦ 218,543 ￦ 183,636
Currency risk [Member]
Statement [LineItems]
Summary of Exposures to Risks, Effects on Profit before Income Tax and Shareholders' Equity	As o (in millions of Korean won) Fluctuation of Impact on profit 1 Impact on equity 2021.12.31 10 % ￦ (3,433 ) ￦ 8,692 -10 % 3,433 (8,692 ) 2022.12.31 10 % ￦ (5,841 ) ￦ (15,836 ) -10 % 5,841 15,836 2023.12.31 10 % ￦ (10,313 ) ￦ (18,460 ) -10 % 10,313 18,460
Summary of Details of Financial Assets and Liabilities in Foreign Currencies	Details of financial assets and liabilities in foreign currencies as at December 31, 2021, 2022 and 2023, are as follows: (In thousands of foreign currencies) 2021 2022 2023 Financial Financial Financial Financial Financial Financial USD 245,759 2,302,642 106,426 2,336,607 139,807 2,271,673 SDR 1 255 722 255 722 254 722 JPY 29,227 30,000,763 32,801 400,002 17,496 400,002 GBP —  1,005 30 83 —  —  EUR 3,943 10,801 185 7,832 304 7,810 RWF 2 586 —  15,521 13,025 402 —  THB 3 2,160 —  265 —  244 —  TZS 4 1,644 —  1,464 —  21,958 —  BWP 5 93 —  183 —  680 —  HKD 6 —  105 37 —  —  —  VND 7 257,895 —  280,226 —  380,629 —  SGD 8 13 284,000 448 284,000 1,375 —  TWD 9 —  226 —  —  1,685 —  CHF 10 —  161 —  —  —  25 MYR 11 —  —  1 —  —  —  BGN 12 —  —  62 —  —  —  PKR 13 —  —  —  —  114,025 —  1 Special Drawing Rights. 2 Rwanda Franc. 3 Thailand Bhat. 4 Tanzanian Shilling. 5 Botswana Pula. 6 Hong Kong Dollar. 7 Vietnam Dong. 8 Singapore Dollar. 9 Taiwan Dollar. 10 Swiss Franc. 11 Ringgit Malaysia. 12 Bulgarian Lev. 13 Pakistani rupee
Equity price risk [Member]
Statement [LineItems]
Summary of Exposures to Risks, Effects on Profit before Income Tax and Shareholders' Equity	As of December 31, 2021, 2022 and 2023, the Group is exposed to equity securities price risk because the securities held by the Group are traded in active markets. If the market prices had increased/decreased by 10% with all other variables held constant, the effects on profit before income tax and equity would have been as follows: (in millions of Korean won) Fluctuation of price Impact on profit Impact on equity 2021.12.31 10% ￦ 2,000 ￦ 4,588 - 10 (2,000 ) (4,588 ) 2022.12.31 10% ￦ 2,660 ￦ 113,948 -10% (2,660 ) (113,948 ) 2023.12.31 10% ￦ 1,473 ￦ 121,423 -10% (1,473 ) (121,423 )
Interest rate risk [Member]
Statement [LineItems]
Summary of Exposures to Risks, Effects on Profit before Income Tax and Shareholders' Equity	As o (in millions of Korean won) Fluctuation of interest rate Impact on profit Impact on equity 2021.12.31 + 100 bp ￦ 753 ￦ 5,549 - 100 bp (731 ) (5,675 ) 2022.12.31 + 100 bp ￦ 635 ￦ (2,045 ) - 100 bp (669 ) 2,100 2023.12.31 + 100 bp ￦ (2,693 ) ￦ (4,718 ) - 100 bp 2,696 5,037

Fair Value (Tables)

Fair Value (Tables)	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
Summary of Carrying Amount and Fair Value of Financial Instruments by Category	Carrying amount and fair value of financial instruments by category as of December 31, 2022 and 2023, are as follows: December 31, 2022 December 31, 2023 (in millions of Korean won) Carrying Fair value Carrying Fair value Financial assets Cash and cash equivalents ￦ 2,449,062   1 ￦ 2,879,554   1 Trade and other receivables Financial assets measured at amortized cost 2 7,364,516   1 8,326,229   1 Financial assets at fair value through other comprehensive income 129,124 129,124 116,198 116,198 Other financial assets Financial assets measured at amortized cost 1,060,058   1 1,385,921   1 Financial assets at fair value through profit or loss 1,064,856 1,064,856 939,661 939,661 Financial assets at fair value through other comprehensive income 1,508,192 1,508,192 1,680,168 1,680,168 Derivative financial assets for hedging 190,830 190,830 159,211 159,211 Total ￦ 13,766,638 ￦ 15,486,942 Financial liabilities Trade and other payables 3 ￦ 8,397,264   1 ￦ 8,317,822   1 Borrowings 10,006,685 9,405,992 10,218,165 9,979,545 Other financial liabilities Financial liabilities at amortized cost 246,606   1 915,185   1 Financial liabilities at fair value through profit or loss 141,280 141,280 136,106 136,106 Derivative financial liabilities for hedging purpose 33,555 33,555 24,547 24,547 Total ￦ 18,825,390 ￦ 19,611,825 1 The Group did not conduct fair value estimation since the book amount is a reasonable approximation of the fair value. 2 Lease receivables are excluded from fair value disclosure in accordance with IFRS 7. 3 Amounts related to employee benefit plans are included in trade and other payables at the end of previous year.
Summary of Fair Value Hierarchy Classifications of Financial Assets and Financial Liabilities That are Measured at Fair Value	Fair value hierarchy classifications of the financial assets and financial liabilities that are measured at fair value disclosed in fair value as of December 31, 2022 and 2023, are as follows: (in millions of Korean won) December 31, 2022 Level 1 Level 2 Level 3 Total Assets Trade and other receivables Financial assets at fair value through other comprehensive income ￦ —  ￦ 129,124 ￦ —  ￦ 129,124 Other financial assets Financial assets at fair value through profit or loss 26,647 426,140 612,069 1,064,856 Financial assets at fair value through other 1,005,900 5,163 497,129 1,508,192 Derivative financial assets for hedging —  189,717 1,113 190,830 Investment properties —  —  5,370,047 5,370,047 Total ￦ 1,032,547 ￦ 750,144 ￦ 6,480,358 ￦ 8,263,049 Liabilities Borrowings ￦ —  ￦ 9,405,992 ￦ —  ￦ 9,405,992 Other financial liabilities Financial liabilities at fair value through profit or loss —  —  141,280 141,280 Derivative financial liabilities for hedging purpose —  33,555 —  33,555 Total ￦ —  ￦ 9,439,547 ￦ 141,280 ￦ 9,580,827 (in millions of Korean won) December 31, 2023 Level 1 Level 2 Level 3 Total Assets Trade and other receivables Financial assets at fair value through other comprehensive income ￦ —  ￦ 116,198 ￦ —  ￦ 116,198 Other financial assets Financial assets at fair value through profit or loss 13,911 156,918 768,832 939,661 Financial assets at fair value through other comprehensive income 1,230,936 5,206 444,026 1,680,168 Derivative financial assets for hedging —  159,211 —  159,211 Investment properties —  —  5,276,169 5,276,169 Total ￦ 1,244,847 ￦ 437,533 ￦ 6,489,027 ￦ 8,171,407 Liabilities Borrowings ￦ —  ￦ 9,979,545 ￦ —  ￦ 9,979,545 Other financial liabilities Financial liabilities at fair value through profit or loss —  1,545 134,561 136,106 Derivative financial liabilities for hedging purpose —  24,547 —  24,547 Total ￦ —  ￦ 10,005,637 ￦ 134,561 ￦ 10,140,198
Summary of Changes in Level 3 of Fair Value Hierarchy for Recurring Fair Value Measurements	Details of changes in Level 3 of the fair value hierarchy for the recurring fair value measurements as of December 31, 2022 and 2023, are as follows: 2022 Financial assets Financial liabilities (in millions of Korean won) Financial assets Financial assets Derivative Financial Beginning balance ￦ 577,085 ￦ 323,373 ￦ 31,565 ￦ 215,332 Acquisition 226,310 262,408 —  3,046 Reclassification (8,962 ) 8,122 —  (54,921 ) Acquisition and disposition of businesses —  (40 ) —  —  Disposal (179,740 ) (97,426 ) (31,565) —  Amount recognized in profit or loss 1 (2,624 ) 18 —  (22,177 ) Amount recognized in other comprehensive income 2 —  674 1,113 —  Ending balance ￦ 612,069 ￦ 497,129 ￦ 1,113 ￦ 141,280 1 The recognition of gains and losses on derivatives financial liabilities (assets) for hedging purposes consists entirely of derivatives valuation losses. 2 The recognition of gains and losses on financial liabilities measured at fair value through profit or loss consists of derivative valuation losses. 2023 Financial assets Financial liabilities (in millions of Korean won) Financial assets Financial assets Derivative Financial Beginning balance ￦ 612,069 ￦ 497,129 ￦ 1,113 ￦ 141,280 Acquisition 216,838 10,267 —  —  Reclassification 26,471 (5,532 ) (1,113) (7,363 ) Acquisition and disposition of businesses 252 —  —  —  Disposal (44,323 ) (6 ) —  (5,205 ) Amount recognized in profit or loss 1, (42,475 ) (61 ) —  5,849 Amount recognized in other comprehensive income —  (57,771 ) —  —  Ending balance ￦ 768,832 ￦ 444,026 ￦ —  ￦ 134,561 1 The recognition of gains and losses on financial liabilities measured at fair value through profit or loss consists of derivative valuation gains and losses.
Summary of Valuation Techniques and Inputs	Valuation techniques and inputs used in the recurring, non-recurring fair value measurements and disclosed fair values categorized within Level 2 and Level 3 of the fair value hierarchy as of December 31, 2022 and 2023, are as follows: (in millions of Korean won) December 31, 2022 Fair value Level Valuation techniques Inputs Assets Trade and other receivables Financial assets at fair value through other comprehensive income ￦ 129,124 2 DCF Model Guaranteed bond interest rate Other financial assets Financial assets at fair value through profit or loss 1,038,209 2,3 DCF Model Adjusted Net Asset Model, Monte-Carlo Simulation Market Interest rate, Underlying asset price Financial assets at fair value through other comprehensive income 502,292 2,3 DCF Model, Market Approach Model Discount rate Derivative financial assets for hedging 190,830 2,3 DCF Model Market observation Swap interest rate Investment properties 5,370,047 3 DCF Model Liabilities Borrowings ￦ 9,405,992 2 DCF Model Bond interest rate Other financial liabilities Financial liabilities at fair value through profit or loss 141,280 3 DCF Model Monte-Carlo Simulation Forward exchange rate Derivative financial liabilities for hedging 33,555 2 DCF Model Market observation (in millions of Korean won) December 31, 2023 Fair value Level Valuation techniques Inputs Assets Trade and other receivables Financial assets at fair value through other comprehensive income ￦ 116,198 2 DCF Model Guaranteed bond interest rate Other financial assets Financial assets at fair value through profit or loss 925,750 2,3 DCF Model Monte-Carlo Simulation Market Interest rate, Underlying asset price Financial assets at fair value through other comprehensive income 449,232 2,3 DCF Model Market Approach Model Discount rate Derivative financial assets for hedging 159,211 2 DCF Model Market observation discount rate, Swap interest rate Investment properties 5,276,169 3 DCF Model Liabilities Borrowings ￦ 9,979,545 2 DCF Model Bond interest rate Other financial liabilities Financial liabilities at fair value through profit or loss 136,106 2,3 DCF Model Binomial Option Pricing Model, Forward exchange rate Forward interest rate Derivative financial liabilities for hedging 24,547 2 DCF Model Market observation discount rate
Summary of Details and Changes of Total Deferred Difference	In relation to this, details and changes of the total deferred difference for the years ended December 31, 2022 and 2023, are as follows: (in millions of Korean won) 2022 2023 Derivatives used Derivatives used I. Beginning balance ￦ 832 ￦ — II. New transactions —  —  III. Recognized at fair value through profit or loss (832 ) — IV. Ending balance (I+II+III) ￦ —  ￦ —

Interests in Unconsolidated S_2

Interests in Unconsolidated Structured Entities (Tables)	12 Months Ended
	Dec. 31, 2023
Investments accounted for using equity method [abstract]
Summary of Unconsolidated Structured Entities and Nature of Risks	(2) Details of scale of unconsolidated structured entities and nature of the risks associated with an entity’s interests in unconsolidated structured entities as of (in millions of Korean won) December 31, 2022 Real Estate PEF and Asset Total Total assets of unconsolidated structured entities ￦ 3,539,827 ￦ 5,580,445 ￦ 2,044,989 ￦ 11,165,261 Assets recognized in statement of financial position Other financial assets ￦ 77,819 ￦ 237,907 ￦ —  ￦ 315,726 Joint ventures and associates 123,138 268,275 —  391,413 Total ￦ 200,957 ￦ 506,182 ￦ —  ￦ 707,139 Maximum loss exposure 1 Investment assets ￦ 200,957 ￦ 506,182 ￦ —  ￦ 707,139 Investment agreement and others 2 40,914 91,224 —  132,138 Total ￦ 241,871 ￦ 597,406 ￦ —  ￦ 839,277 1 Includes the investments recognized in the Group’s financial statements and the amounts which are probable to be determined when certain conditions are met. 2 Investment agreements and others include purchase agreements, credit granting and others. (in millions of Korean won) December 31, 2023 Real Estate PEF and Asset Total Total assets of unconsolidated structured entities ￦ 7,890,823 ￦ 4,833,966 ￦ 1,846,270 ￦ 14,571,059 Assets recognized in statement of financial position Other financial assets ￦ 216,040 ￦ 227,266 ￦ —  ￦ 443,306 Joint ventures and associates 144,517 282,550 —  427,067 Total ￦ 360,557 ￦ 509,816 ￦ —  ￦ 870,373 Maximum loss exposure 1 Investment assets ￦ 360,557 ￦ 509,816 ￦ —  ￦ 870,373 Investment agreement and others 2 44,975 106,064 —  151,039 Total ￦ 405,532 ￦ 615,880 ￦ —  ￦ 1,021,412 1 Includes the investments recognized in the Group’s financial statements and the amounts which are probable to be determined when certain conditions are met. 2 Investment agreements and others include purchase agreements, credit granting and others.

Information About Non-control_2

Information About Non-controlling Interests (Tables)	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
Summary of changes in accumulated non-controlling interests	Profit or loss allocated to non-controlling interests and accumulated non-controlling interests of subsidiaries that are material to the Group for the years ended December 31, 2021, 2022 and 2023 are as follows: (In millions of Korean won) December 31, 2021 Non- controlling rate (%) Accumulated non-controlling Profit or loss non-controlling Dividends to non- Others Accumulated non-controlling KT Skylife Co., Ltd. 49.7 % ￦ 388,900 ￦ 24,795 ￦ (8,279 ) ￦ 5,279 ￦ 410,695 BC Card Co., Ltd. 30.5 % 411,826 34,496 (6,434 ) 59,040 498,928 KTIS Corporation 68.6 % 120,071 17,715 (1,837 ) (709 ) 135,240 KTCS Corporation 79.7 % 129,502 21,394 (2,211 ) (3,574 ) 145,111 Nasmedia, Co., Ltd. 56.0 % 112,549 15,185 (3,808 ) 255 124,181 (In millions of Korean won) December 31, 2022 Non- controlling Accumulated non-controlling Profit or loss non-controlling Dividends to non- Others Accumulated non-controlling KT Skylife Co., Ltd. 49.8 % ￦ 410,695 ￦ 7,127 ￦ (8,284 ) ￦ 13,651 ￦ 423,189 BC Card Co., Ltd. 30.5 % 498,928 47,909 (7,641 ) (14,539 ) 524,657 KTIS Corporation 66.7 % 135,240 14,965 (2,226 ) (6,577 ) 141,402 KTCS Corporation 78.3 % 145,111 18,888 (2,721 ) (7,397 ) 153,881 Nasmedia, Co., Ltd. 56.0 % 124,181 15,610 (4,187 ) (179 ) 135,425 (In millions of Korean won) December 31, 2023 Non- controlling Accumulated non-controlling Profit or loss non-controlling Dividends to non- Others Accumulated non-controlling KT Skylife Co., Ltd. 49.4 % ￦ 423,189 ￦ (47,355 ) ￦ (8,287 ) ￦ (6,192 ) ￦ 361,355 BC Card Co., Ltd. 30.5 % 524,657 25,355 (4,960 ) 3,023 548,075 KTIS Corporation 66.7 % 141,402 5,947 (2,451 ) (1,872 ) 143,026 KTCS Corporation 78.3 % 153,881 14,228 (3,001 ) (2,313 ) 162,795 Nasmedia Co., Ltd 55.9 % 135,425 10,679 (4,028 ) (467 ) 141,609
Summary of financial information on subsidiaries	December 31, 2022 (in millions of Korean won) KT Skylife BC Card Co., KTIS KTCS Nasmedia, Current assets ￦ 420,701 ￦ 3,152,622 ￦ 102,121 ￦ 296,209 ￦ 435,359 Non-current assets 938,465 2,513,453 294,087 123,517 81,586 Current liabilities 274,637 2,879,551 103,698 188,379 261,381 Non-current liabilities 229,042 1,229,649 95,506 40,240 14,349 Equity 855,487 1,556,875 197,004 191,107 241,215 December 31, 2023 (in millions of Korean won) KT Skylife BC Card Co., KTIS KTCS Nasmedia, Current assets ￦ 425,661 ￦ 3,739,847 ￦ 111,313 ￦ 304,508 ￦ 411,774 Non-current assets 795,182 2,613,031 336,296 130,391 101,537 Current liabilities 353,839 3,661,263 116,271 187,621 251,207 Non-current liabilities 125,531 1,061,169 127,248 47,228 11,129 Equity 741,473 1,630,446 204,090 200,050 250,975
Summary of consolidated statements of comprehensive income	Summarized consolidated statements of comprehensive income for the years ended December 31, 2021,2022 and 2023 are as follows: 2021 (in millions of Korean won) KT Skylife BC Card Co., KTIS KTCS Nasmedia, Operating revenue ￦ 772,950 ￦ 3,580,970 ￦ 487,801 ￦ 968,499 ￦ 125,876 Profit for the year 62,309 120,308 24,944 19,034 27,120 Other comprehensive income (loss) 12,686 2,270 3,725 (2,120 ) 871 Total comprehensive income 74,995 122,578 28,669 16,914 27,991 2022 (in millions of Korean won) KT Skylife BC Card Co., KTIS KTCS Nasmedia, Operating revenue ￦ 1,038,468 ￦ 3,897,090 ￦ 536,229 ￦ 1,031,010 ￦ 153,210 Profit for the year 20,941 148,341 15,917 17,634 27,691 Other comprehensive income (loss) 13,544 (5,286 ) (2,415 ) (134 ) (695 ) Total comprehensive income 34,485 143,055 13,502 17,500 26,996 2023 (in millions of Korean won) KT Skylife BC Card Co., KTIS KTCS Nasmedia, Operating revenue ￦ 1,034,342 ￦ 4,027,450 ￦ 593,162 ￦ 1,035,911 ￦ 147,934 Profit for the year (109,407 ) 76,545 13,922 15,804 17,703 Other comprehensive income (loss) (6,625 ) 13,832 (3,162 ) (2,550 ) (1,890 ) Total comprehensive income (116,032 ) 90,377 10,760 13,254 15,813
Summary of consolidated statements of cash flows	Summarized consolidated statements of cash flows for the years ended December 31, 2021,2022 and 2023 are as follows: 2021 (in millions of Korean won) KT Skylife BC Card Co., KTIS KTCS Nasmedia, Cash flows from operating activities ￦ 102,947 ￦ (157,645 ) ￦ 49,011 ￦ 6,945 ￦ 44,500 Cash flows from investing activities (352,116 ) (283,313 ) (27,143 ) (1,039 ) (16,966 ) Cash flows from financing activities 230,010 526,563 (23,126 ) (16,622 ) (9,843 ) Net increase (decrease) in cash and cash equivalents (19,159 ) 85,605 (1,258 ) (10,716 ) 17,691 Cash and cash equivalents at beginning of year 99,834 240,584 31,779 75,440 53,720 Exchange differences (3 ) 293 —  (840 ) (15 ) Cash and cash equivalents at end of the year 80,672 326,482 30,521 63,884 71,396 2022 (in millions of Korean won) KT Skylife BC Card Co., KTIS KTCS Nasmedia, Cash flows from operating activities ￦ 176,407 ￦ (798,043 ) ￦ 13,809 ￦ 19,423 ￦ 22,015 Cash flows from investing activities (78,928 ) (7,733 ) 9,813 13,245 3,845 Cash flows from financing activities (79,455 ) 914,441 (29,199 ) (35,578 ) (11,136 ) Net increase (decrease) in cash and cash equivalents 18,024 108,665 (5,577 ) (2,910 ) 14,724 Cash and cash equivalents at beginning of year 80,672 326,482 30,521 63,884 71,396 Exchange differences (1 ) (100 ) —  840 13 Cash and cash equivalents at end of the year 98,695 435,047 24,944 61,814 86,133 2023 (in millions of Korean won) KT Skylife BC Card Co., KTIS KTCS Nasmedia, Cash flows from operating activities ￦ 207,207 ￦ 82,883 ￦ 50,892 ￦ 55,146 ￦ 8,116 Cash flows from investing activities (125,343 ) (74,430 ) (17,636 ) (5,901 ) (30,910 ) Cash flows from financing activities (50,811 ) (67,609 ) (32,872 ) (26,948 ) (11,077 ) Net increase (decrease) in cash and cash equivalents 31,053 (59,156 ) 384 22,297 (33,871 ) Cash and cash equivalents at beginning of year 98,695 435,047 24,944 61,814 86,133 Exchange differences —  (95 ) —  —  15 Cash and cash equivalents at end of the year 129,748 375,796 25,328 84,111 52,277
Summary of changes in ownership interest on the equity attributable to owners	(in millions of Korean won) 2021 2022 2023 Carrying amount of non-controlling interests acquired ￦ 14,702 ￦ 19,272 ￦ 3,022 Consideration paid to non-controlling interests 1,095 69,652 213,819 Effect of changes in equity (net amount) ￦ 15,797 ￦ 88,924 ￦ 216,841

Events After the Reporting Pe_2

Events After the Reporting Period (Tables)	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
Summary of public bonds issued after reporting period	(2) The company issued the following bonds after the end of the reporting period (unit: ￦ Type Issued Date Annual interest Maturity Korean The 200-1st Public bond Feb. 27, 2024 3.552 % Feb. 27, 2026- 120,000 The 200-2nd Public bond Feb. 27, 2024 3.608 % Feb. 26, 2027- 200,000 The 200-3rd Public bond Feb. 27, 2024 3.548 % Feb. 27, 2029- 80,000

General Information - Additiona

General Information - Additional Information (Detail) - shares	Jul. 02, 2001	May 29, 1999
Disclosure of general information [line items]
Number of additional shares issued	55,502,161	24,282,195
Government Owned shares [member]
Disclosure of general information [line items]
Number of additional shares issued		20,813,311

General Information - Summary o

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%	73%
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%	100%
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%	100%
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%	100%
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%	100%
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%	100%
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%	100%
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%	100%
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%	100%
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%	36%
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%	100%
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%	100%
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%	100%
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%	100%
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%	100%
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%	100%
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%	100%
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%
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%	100%
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%	100%
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%	100%
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%	100%
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%	51%
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%	51%
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%	100%
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%	100%
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%	100%
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%	100%
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%	100%
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%	100%
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%	100%
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%	100%
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%	100%
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%	100%
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%	100%
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%	100%
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%	100%
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%	100%
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%	100%
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%	100%
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%	100%
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%	100%
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%	100%
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%	100%
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%	100%
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%	100%
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%	100%
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%	100%
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%	75%
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%	100%
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%
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%	100%
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%	67%
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%	100%
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%	100%
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%
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%
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%
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

General Information - Summary_2

General Information - Summary of Consolidated Subsidiaries (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2023
Nasmedia, Co., Ltd. [Member]
Disclosure of subsidiaries [line items]
Base proportion of ownership interest in subsidiary	50%
KTCS Corporation [member]
Disclosure of subsidiaries [line items]
Base proportion of ownership interest in subsidiary	50%
KTIS Corporation [member]
Disclosure of subsidiaries [line items]
Base proportion of ownership interest in subsidiary	50%
Millie Seojae [Member]
Disclosure of subsidiaries [line items]
Base proportion of ownership interest in subsidiary	50%
GENIE Music Corporation [Member]
Disclosure of subsidiaries [line items]
Base proportion of ownership interest in subsidiary	50%
Juice Inc. [Member]
Disclosure of subsidiaries [line items]
Base proportion of ownership interest in subsidiary	50%
K-Realty Qualified Private Real Estate Investment Trust No. 1 [Member]
Disclosure of subsidiaries [line items]
Base proportion of ownership interest in subsidiary	50%

Material Accounting Policies -

Material Accounting Policies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2023
Bottom of range [member]
Disclosure of significant accounting policies [line items]
Useful lives of investment property, excluding land depreciated cost model	5 years
Top of range [member]
Disclosure of significant accounting policies [line items]
Useful lives of investment property, excluding land depreciated cost model	40 years

Material Accounting Policies _2

Material Accounting Policies - Summary of Estimated Useful Lives of Property, Plant and Equipment (Detail)	12 Months Ended
	Dec. 31, 2023
Buildings [member] | Bottom of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated Useful Life	5 years
Buildings [member] | Top of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated Useful Life	40 years
Structures [member] | Bottom of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated Useful Life	5 years
Structures [member] | Top of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated Useful Life	40 years
Machinery and equipment (Telecommunications equipment and others) [member] | Bottom of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated Useful Life	2 years
Machinery and equipment (Telecommunications equipment and others) [member] | Top of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated Useful Life	40 years
Vehicles [member] | Bottom of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated Useful Life	4 years
Vehicles [member] | Top of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated Useful Life	10 years
Tools [member] | Bottom of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated Useful Life	2 years
Tools [member] | Top of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated Useful Life	6 years
Office equipment [member] | Bottom of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated Useful Life	2 years
Office equipment [member] | Top of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated Useful Life	8 years

Material Accounting Policies _3

Material Accounting Policies - Summary of Amortization of Intangible Assets With Limited Useful Life (Detail)	12 Months Ended
	Dec. 31, 2023
Development costs [member] | Bottom of range [member]
Disclosure of detailed information about intangible assets [line items]
Estimated Useful Life	3 years
Development costs [member] | Top of range [member]
Disclosure of detailed information about intangible assets [line items]
Estimated Useful Life	10 years
Software [member] | Bottom of range [member]
Disclosure of detailed information about intangible assets [line items]
Estimated Useful Life	3 years
Software [member] | Top of range [member]
Disclosure of detailed information about intangible assets [line items]
Estimated Useful Life	10 years
Frequency usage rights [member] | Bottom of range [member]
Disclosure of detailed information about intangible assets [line items]
Estimated Useful Life	5 years
Frequency usage rights [member] | Top of range [member]
Disclosure of detailed information about intangible assets [line items]
Estimated Useful Life	10 years
Others [member] | Bottom of range [member]
Disclosure of detailed information about intangible assets [line items]
Estimated Useful Life	1 year
Others [member] | Top of range [member]
Disclosure of detailed information about intangible assets [line items]
Estimated Useful Life	50 years

Financial Instruments by Cate_3

Financial Instruments by Category - Summary of Financial Instruments by Category (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure of detailed information about financial instruments [line items]
Trade and other payables	₩ 8,317,822	₩ 8,397,264
Borrowings	10,218,165	10,006,685
Other financial liabilities	1,075,838	421,441
Lease liabilities	1,179,909	1,172,038
Cash and cash equivalents	2,879,554	2,449,062	₩ 3,019,592	₩ 2,634,624
Trade and other receivables	8,574,457	7,589,118
Other financial assets	4,164,961	3,823,936
Loans and receivables [member]
Disclosure of detailed information about financial instruments [line items]
Cash and cash equivalents	2,879,554	2,449,062
Trade and other receivables	8,458,259	7,459,994
Other financial assets	1,385,921	1,060,058
Financial assets at fair value through profit or loss [member]
Disclosure of detailed information about financial instruments [line items]
Other financial assets	939,661	1,064,856
Derivative used for hedge [member]
Disclosure of detailed information about financial instruments [line items]
Other financial liabilities	24,547	33,555
Other financial assets	159,211	190,830
Financial liabilities designated as at fair value through profit or loss [member]
Disclosure of detailed information about financial instruments [line items]
Other financial liabilities	136,106	141,280
Financial liabilities at amortized cost [member]
Disclosure of detailed information about financial instruments [line items]
Trade and other payables	8,317,822	8,397,264
Borrowings	10,218,165	10,006,685
Other financial liabilities	915,185	246,606
Financial assets at fair value through other comprehensive income [member]
Disclosure of detailed information about financial instruments [line items]
Trade and other receivables	116,198	129,124
Other financial assets	1,680,168	1,508,192
Others [member]
Disclosure of detailed information about financial instruments [line items]
Lease liabilities	₩ 1,179,909	₩ 1,172,038

Financial Instruments by Cate_4

Financial Instruments by Category - Summary of Gains or Losses Arising From Financial Instruments by Category (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure of detailed information about financial instruments [line items]
Interest income	₩ 279,607	₩ 271,925	₩ 273,460
Interest expense	(356,345)	(293,854)	(263,389)
Total	(92,910)	(353,980)	215,095
Other comprehensive income (loss) for the year	7,447	(2,194)	165,567
Reclassified to profit or loss from other comprehensive income (loss) for the year	(37,942)	(95,421)
Interest expense	(52,035)	(41,469)	(36,651)
Financial liabilities designated as at fair value through profit or loss [member]
Disclosure of detailed information about financial instruments [line items]
Interest expense	(44)	(4,046)
Gain on foreign currency transaction	(5)	24	(2)
Gain (loss) on disposal	4,788		2,136
Gain (loss) on valuation	(7,394)	30,031	42,447
Derivatives used for hedging [member]
Disclosure of detailed information about financial instruments [line items]
Gain (loss) on transactions		(1,291)	(6,208)
Gain (loss) on valuation	11,503	(17,237)	(7,206)
Other comprehensive income (loss) for the year	7,557	(23,957)	(3,112)
Reclassified to profit or loss from other comprehensive income (loss) for the year	(8,764)	15,195	6,722
Financial liabilities at amortized cost [member]
Disclosure of detailed information about financial instruments [line items]
Interest expense	(358,486)	(275,302)	(232,197)
Gain on foreign currency transaction	(24,054)	(34,574)	(3,580)
Gain (loss) on foreign currency translation	(93,004)	(168,577)	(201,623)
Gain (loss) on valuation	3,411
Lease liabilities [member]
Disclosure of detailed information about financial instruments [line items]
Interest expense	(52,035)	(41,469)	(36,650)
Financial assets at amortized cost [member]
Disclosure of detailed information about financial instruments [line items]
Interest income	360,134	144,505	74,937
Gain on foreign currency transaction	22,782	23,824	12,826
Gain (loss) on foreign currency translation	5,741	(2,151)	2,911
Gain (loss) on disposal	(3,409)	(81)	35
Gain (loss) on valuation	(172,966)	(132,102)	(110,286)
Financial assets at fair value through profit or loss [member]
Disclosure of detailed information about financial instruments [line items]
Interest income	13,480	6,008	3,673
Dividend income	6,918	4,600	21,499
Gain on foreign currency transaction		1,100
Gain (loss) on foreign currency translation	3,396	13,711	17,794
Gain (loss) on disposal	14,237	2,347	29,974
Gain (loss) on valuation	(31,965)	(29,282)	64,659
Financial assets at fair value through other comprehensive income [member]
Disclosure of detailed information about financial instruments [line items]
Interest income	18,966	190,281	222,290
Dividend income	52,813	9,522	1,365
Gain (loss) on disposal	(11,193)	(62,183)	(22,712)
Gain (loss) on valuation		(61)
Other comprehensive income (loss) for the year	121,805	(158,574)	129,780
Derivatives financial assets for hedging [member]
Disclosure of detailed information about financial instruments [line items]
Gain (loss) on transactions	10,192	27,628
Gain (loss) on valuation	34,092	150,699	203,961
Other comprehensive income (loss) for the year	7,772	88,048	144,967
Reclassified to profit or loss from other comprehensive income (loss) for the year	₩ (29,178)	₩ (110,616)	₩ (143,305)

Financial Instruments by Cate_5

Financial Instruments by Category - Summary of Gains or Losses Arising From Financial Instruments by Category (Parenthetical) (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure of detailed information about financial instruments [line items]
Interest income recognized as operating revenue	₩ 279,607	₩ 271,925	₩ 273,460
Interest expense recognized as operating expense	356,345	293,854	263,389
Profit and loss from foreign currency transaction	27,407	67,976	19,976
BC Card Co., Ltd. [member]
Disclosure of detailed information about financial instruments [line items]
Interest income recognized as operating revenue	112,973	68,869	27,440
Interest expense recognized as operating expense	55,677	27,060	5,458
Profit and loss from foreign currency transaction	5,597	3,569	2,373
Dividend income	1,759	2,299	1,340
Gain (loss) on valuation	11,112	7,860	₩ 15,459
Gain Loss On Valuation Of derivatives	48	₩ 418
KT Cloud Co., Ltd. [member]
Disclosure of detailed information about financial instruments [line items]
Gain on convertible preferred stock	₩ 311,312

Cash and Cash Equivalents to Re

Cash and Cash Equivalents to Restricted Cash - Summary of Restricted Cash and Cash Equivalents (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2023	Dec. 31, 2022
Cash and cash equivalents [abstract]
Deposit restricted for governmental project and others	₩ 49,555	₩ 29,874

Trade and Other Receivables - S

Trade and Other Receivables - Summary of Trade and Other Receivables (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2023	Dec. 31, 2022
Disclosure of financial assets [line items]
Trade receivables	₩ 3,257,732	₩ 3,090,077
Other receivables	3,912,557	3,007,995
Trade and other receivables, net	7,170,289	6,098,072
Trade receivables	297,665	395,359
Other receivables	1,106,503	1,095,687
Total	1,404,168	1,491,046
Gross carrying amount [member]
Disclosure of financial assets [line items]
Trade receivables	3,596,899	3,439,542
Other receivables	3,990,900	3,092,261
Trade and other receivables, net	7,587,799	6,531,803
Trade receivables	318,429	408,098
Other receivables	1,227,929	1,249,096
Total	1,546,358	1,657,194
Accumulated depreciation, amortisation and impairment [member]
Disclosure of financial assets [line items]
Trade receivables	(330,002)	(342,539)
Other receivables	(76,089)	(82,243)
Trade and other receivables, net	(406,091)	(424,782)
Trade receivables	(1,288)	(1,199)
Other receivables	(107,547)	(136,300)
Total	(108,835)	(137,499)
Present value discount [member]
Disclosure of financial assets [line items]
Trade receivables	(9,165)	(6,926)
Other receivables	(2,254)	(2,023)
Trade and other receivables, net	(11,419)	(8,949)
Trade receivables	(19,476)	(11,540)
Other receivables	(13,879)	(17,109)
Total	₩ (33,355)	₩ (28,649)

Trade and Other Receivables -_2

Trade and Other Receivables - Summary of Changes in Summary of Changes in Provision for Impairment (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure of financial assets [line items]
Acquisition and disposition of businesses	₩ (5,564)	₩ 8,587	₩ 5,128
Trade receivables [member]
Disclosure of financial assets [line items]
Beginning balance	343,738	349,725
Provision	69,972	64,522
Write-off/transfer	(69,246)	(69,430)
Acquisition and disposition of businesses	(310)	(43)
Others	(12,864)	(1,036)
Ending balance	331,290	343,738	349,725
Other receivables [member]
Disclosure of financial assets [line items]
Beginning balance	218,543	201,387
Provision	114,501	65,941
Reversal	(14,941)	(850)
Write-off/transfer	(129,108)	(49,904)
Acquisition and disposition of businesses	(17)
Others	(5,342)	1,969
Ending balance	₩ 183,636	₩ 218,543	₩ 201,387

Trade and Other Receivables -_3

Trade and Other Receivables - Summary of Other Receivables (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure of financial assets [line items]
Receivables 1	₩ 8,574,457	₩ 7,589,118
Other receivables [member]
Disclosure of financial assets [line items]
Loans	51,854	98,953
Receivables 1	3,539,742	2,668,545
Accrued income	43,920	32,218
Refundable deposits	299,935	339,450
Loans receivable	1,067,005	1,013,428
Finance lease receivables	141,883	105,690
Others	58,357	63,941
Less: Provision for impairment	(183,636)	(218,543)	₩ (201,387)
Other receivables	₩ 5,019,060	₩ 4,103,682

Trade and Other Receivables -_4

Trade and Other Receivables - Summary of Other Receivables (Parenthetical) (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2023	Dec. 31, 2022
BC Card Co., Ltd. [member]
Disclosure of financial assets [line items]
Settlement receivable included in other receivables	₩ 2,696,505	₩ 1,960,579

Other Financial Assets and Li_3

Other Financial Assets and Liabilities - Summary of Other Financial Assets and Liabilities (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2023	Dec. 31, 2022
Other financial assets
Financial assets at amortized cost	₩ 1,385,921	₩ 1,060,058
Financial assets at fair value through profit or loss	939,661	1,064,856
Financial assets at fair value through other comprehensive income	1,680,168	1,508,192
Derivatives used for hedging	159,211	190,830
Less: Non-current	(2,724,761)	(2,501,484)
Current	1,440,200	1,322,452
Other financial liabilities
Financial liabilities at amortized cost	915,185	246,606
Financial liabilities at fair value through profit or loss	136,106	141,280
Derivatives used for hedging	24,547	33,555
Less: Non-current	(753,739)	(412,650)
Current Other financial assets	₩ 322,099	₩ 8,791

Other Financial Assets and Li_4

Other Financial Assets and Liabilities - Summary of Other Financial Assets and Liabilities (Parenthetical) (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Korea software financial cooperative [member]
Disclosure of detailed information about financial instruments [line items]
Available-for-sale financial assets investment amount	₩ 9,016
Ustream Inc. [member]
Disclosure of detailed information about financial instruments [line items]
Proceeds from the disposal of Subsidiary	₩ 98,309	₩ 102,215

Other Financial Assets and Li_5

Other Financial Assets and Liabilities - Summary of Financial Assets at Fair Value Through Profit or Loss (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2023	Dec. 31, 2022
Disclosure of financial assets [line items]
Equity Instruments	₩ 939,661	₩ 1,064,856
Less: non-current	(782,143)	(609,887)
Current	157,518	454,969
Equity Instruments Listed [member]
Disclosure of financial assets [line items]
Equity Instruments	13,911	26,647
Equity Instruments Unlisted [member]
Disclosure of financial assets [line items]
Equity Instruments	42,185	72,517
Debt securities [member]
Disclosure of financial assets [line items]
Equity Instruments	880,549	942,274
Derivatives held for trading [member]
Disclosure of financial assets [line items]
Equity Instruments	₩ 3,016	₩ 23,418

Other Financial Assets and Li_6

Other Financial Assets and Liabilities - Summary of Financial Assets at Fair Value Through Profit or Loss (Parenthetical) (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2023	Dec. 31, 2022
Disclosure of financial assets [line items]
Derivative financial assets	₩ 159,211	₩ 190,830
Submarine Co Ltd [Member]
Disclosure of financial assets [line items]
Derivative financial assets	₩ 1,015

Other Financial Assets and Li_7

Other Financial Assets and Liabilities - Additional Information (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure of detailed information about financial instruments [line items]
Ineffective portion recognized in profit or loss cash flow hedge valuation gain	₩ 41	₩ 2,707	₩ 11,825

Other Financial Assets and Li_8

Other Financial Assets and Liabilities - Summary of Financial Assets at Fair Value Through Other Comprehensive Income (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2023	Dec. 31, 2022
Financial assets at fair value through other comprehensive income [line items]
Equity Instruments	₩ 1,680,168	₩ 1,508,192
Less: non-current	(1,680,168)	(1,508,192)
Current	0	0
Equity Instruments Listed [member]
Financial assets at fair value through other comprehensive income [line items]
Equity Instruments	1,231,188	1,006,476
Equity Instruments Unlisted [member]
Financial assets at fair value through other comprehensive income [line items]
Equity Instruments	443,067	496,284
Debt securities [member]
Financial assets at fair value through other comprehensive income [line items]
Equity Instruments	₩ 5,913	₩ 5,432

Other Financial Assets and Li_9

Other Financial Assets and Liabilities - Summary of Derivative Financial Assets and Liabilities (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2023	Dec. 31, 2022
Disclosure of detailed information about financial instruments [line items]
Assets, Total	₩ 159,211	₩ 190,830
Less: Assets, non-current	(107,802)	(147,141)
Assets, Current	51,409	43,689
Liabilities, Total	24,547	33,555
Less: Liabilities, non-current	(23,696)	(33,555)
Liabilities, Current	851	0
Interest rate swap [member]
Disclosure of detailed information about financial instruments [line items]
Assets, Total	1,530	4,236
Liabilities, Total	191	0
Currency swap [member]
Disclosure of detailed information about financial instruments [line items]
Assets, Total	157,681	186,594
Liabilities, Total	₩ 24,356	₩ 33,555

Other Financial Assets and L_10

Other Financial Assets and Liabilities - Summary of Valuation Gains and Losses on Derivatives Contracts (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure of detailed information about financial instruments [line items]
Valuation gain	₩ 45,757	₩ 154,674	₩ 203,961
Valuation loss	162	21,213	7,206
Other comprehensive income	(30,218)	85,201	191,570
Interest rate swap [member]
Disclosure of detailed information about financial instruments [line items]
Valuation gain	48	63	0
Valuation loss	0	490	0
Other comprehensive income	(2,945)	4,666	1
Currency swap [member]
Disclosure of detailed information about financial instruments [line items]
Valuation gain	45,709	154,611	203,961
Valuation loss	162	20,723	7,206
Other comprehensive income	(27,273)	79,781	191,569
Currency forwards [member]
Disclosure of detailed information about financial instruments [line items]
Valuation gain	0	0	0
Valuation loss	0	0	0
Other comprehensive income	₩ 0	₩ 754	₩ 0

Other Financial Assets and L_11

Other Financial Assets and Liabilities - Summary of Hedged items (Detail) - Derivatives [member] - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Disclosure of detailed information about hedged items [line items]
Book value of hedged items	₩ 2,848,287	₩ 3,058,980
Changes in fair value to calculate the ineffective portion of hedges	(45,380)	(193,198)
Cash flow hedge reserves	(28,893)	(5,458)
USD
Disclosure of detailed information about hedged items [line items]
Book value of hedged items	2,593,707	2,675,885
Changes in fair value to calculate the ineffective portion of hedges	(44,365)	(170,010)
Cash flow hedge reserves	(30,415)	(13,947)
JPY
Disclosure of detailed information about hedged items [line items]
Book value of hedged items	3,651	3,813
Changes in fair value to calculate the ineffective portion of hedges	162	308
Cash flow hedge reserves	49	116
SGD
Disclosure of detailed information about hedged items [line items]
Book value of hedged items	0	267,843
Changes in fair value to calculate the ineffective portion of hedges	0	(18,720)
Cash flow hedge reserves	0	3,406
EUR
Disclosure of detailed information about hedged items [line items]
Book value of hedged items	10,985	10,404
Changes in fair value to calculate the ineffective portion of hedges	(581)	(121)
Cash flow hedge reserves	158	582
KRW
Disclosure of detailed information about hedged items [line items]
Book value of hedged items	239,944	101,035
Changes in fair value to calculate the ineffective portion of hedges	(596)	(4,655)
Cash flow hedge reserves	₩ 1,315	₩ 4,385

Other Financial Assets and L_12

Other Financial Assets and Liabilities - Summary of Hedging instruments (Detail) - Derivatives [member] - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Disclosure of detailed information about hedging instruments [line items]
Foreign currency	₩ 0
Contract amount	2,672,113	₩ 2,957,474
Assets	159,211	190,830
Liabilities	24,547	33,555
Changes in fair value to calculate the ineffective portion of hedges	45,339	195,905
USD
Disclosure of detailed information about hedging instruments [line items]
Foreign currency	2,011,509	2,111,509
Contract amount	2,417,473	2,527,626
Assets	157,681	160,243
Liabilities	23,465	32,936
Changes in fair value to calculate the ineffective portion of hedges	44,413	170,856
JPY
Disclosure of detailed information about hedging instruments [line items]
Foreign currency	400,000	400,000
Contract amount	4,357	4,357
Assets	0	0
Liabilities	660	409
Changes in fair value to calculate the ineffective portion of hedges	(162)	(308)
SGD
Disclosure of detailed information about hedging instruments [line items]
Foreign currency		284,000
Contract amount		245,208
Assets		26,351
Liabilities		0
Changes in fair value to calculate the ineffective portion of hedges		20,511
EUR
Disclosure of detailed information about hedging instruments [line items]
Foreign currency	7,700	7,700
Contract amount	10,283	10,283
Assets	0	0
Liabilities	231	210
Changes in fair value to calculate the ineffective portion of hedges	381	129
KRW
Disclosure of detailed information about hedging instruments [line items]
Foreign currency	0	0
Contract amount	240,000	170,000
Assets	1,530	4,236
Liabilities	191	0
Changes in fair value to calculate the ineffective portion of hedges	₩ 707	₩ 4,717

Other Financial Assets and L_13

Other Financial Assets and Liabilities - Summary of Financial Liabilities at Fair Value Through Profit or Loss (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2023	Dec. 31, 2022
Financial liabilities at fair value through profit or loss
Derivative liabilities held for trading	₩ 136,106	₩ 141,280

Other Financial Assets and L_14

Other Financial Assets and Liabilities - Summary of Financial Liabilities at Fair Value Through Profit or Loss (Parenthetical) (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2023	Dec. 31, 2022
Disclosure of financial liabilities [line items]
Derivative financial liabilities	₩ 24,547	₩ 33,555
K Bank Inc. [Member]
Disclosure of financial liabilities [line items]
Derivative financial liabilities	₩ 133,293	₩ 134,881

Other Financial Assets and L_15

Other Financial Assets and Liabilities - Summary of Valuation Gain and Loss on Financial Liabilities at Fair Value Through Profit or Loss (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure of financial liabilities [line items]
Derivative liabilities held for trading	₩ 136,106	₩ 141,280
Valuation gain on financial liabilities [member]
Disclosure of financial liabilities [line items]
Derivative liabilities held for trading	3,316	24,683	₩ 51,187
Valuation loss on financial liabilities [member]
Disclosure of financial liabilities [line items]
Derivative liabilities held for trading	₩ 10,710	₩ 1,800	₩ 8,741

Inventories - Summary of Invent

Inventories - Summary of Inventories Net (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2023	Dec. 31, 2022
Disclosure of inventories [line items]
Inventories	₩ 988,351	₩ 717,673
Merchandise [member]
Disclosure of inventories [line items]
Inventories	878,912	672,738
Others [member]
Disclosure of inventories [line items]
Inventories	109,439	44,935
Gross carrying amount [member]
Disclosure of inventories [line items]
Inventories	1,090,566	813,683
Gross carrying amount [member] | Merchandise [member]
Disclosure of inventories [line items]
Inventories	981,127	768,748
Gross carrying amount [member] | Others [member]
Disclosure of inventories [line items]
Inventories	109,439	44,935
Valuation allowance [member]
Disclosure of inventories [line items]
Inventories	(102,215)	(96,010)
Valuation allowance [member] | Merchandise [member]
Disclosure of inventories [line items]
Inventories	₩ (102,215)	₩ (96,010)

Inventories - Additional Inform

Inventories - Additional Information (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Classes of current inventories [abstract]
Inventories recognised as expense	₩ 3,386,069	₩ 3,485,288	₩ 3,787,203
Valuation loss and reversal of valuation loss	₩ 6,205	₩ 24,294	₩ 12,920

Other Assets and Liabilities -

Other Assets and Liabilities - Summary of Other Assets and Liabilities (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2023	Dec. 31, 2022
Other assets
Advance payments	₩ 217,997	₩ 181,150
Prepaid expenses	146,628	107,775
Contract Cost	1,727,468	1,817,678
Contract assets	832,520	802,253
Others	15,237	12,964
Less: Non-current	(827,297)	(820,608)
Current	2,112,553	2,101,212
Other liabilities
Advances received	682,880	387,986
Withholdings	159,080	155,017
Unearned revenue	27,392	46,493
Lease liabilities	1,179,909	1,172,038
Contract liabilities	278,749	284,107
Others	30,848	33,108
Less: Non-current	(950,015)	(945,731)
Current	₩ 1,408,843	₩ 1,133,018

Property and Equipment - Summar

Property and Equipment - Summary of Changes in Property and Equipment (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure of detailed information about property, plant and equipment [line items]
Beginning, net	₩ 14,772,179	₩ 14,464,886
Acquisition and capital expenditure	3,189,108	3,346,380
Disposal and termination	(81,119)	(92,123)
Depreciation	(2,720,283)	(2,640,187)
Impairment	(7,872)	(16,156)
Transfer in (out)	(159,872)	(62,802)
Transfer from (to) investment properties	(126,250)	(206,183)
Acquisition and disposition of businesses	5,564	(8,587)	₩ (5,128)
Others	624	(13,049)
Ending, net	14,872,079	14,772,179	14,464,886
Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning, net	50,580,188	48,995,516
Ending, net	52,056,203	50,580,188	48,995,516
Accumulated depreciation, amortisation and impairment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning, net	(35,808,009)	(34,530,630)
Ending, net	(37,184,124)	(35,808,009)	(34,530,630)
Land [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning, net	1,272,808	1,315,797
Acquisition and capital expenditure	844	11,392
Disposal and termination	(3,651)	(2,556)
Transfer in (out)	58,790	24,647
Transfer from (to) investment properties	(37,725)	(63,278)
Acquisition and disposition of businesses	18,761	0
Others	14,549	(13,194)
Ending, net	1,324,376	1,272,808	1,315,797
Land [member] | Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning, net	1,272,940	1,315,929
Ending, net	1,324,508	1,272,940	1,315,929
Land [member] | Accumulated depreciation, amortisation and impairment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning, net	(132)	(132)
Ending, net	(132)	(132)	(132)
Buildings and structures [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning, net	2,554,561	2,517,422
Acquisition and capital expenditure	5,072	32,030
Disposal and termination	(5,012)	(4,338)
Depreciation	(148,981)	(147,620)
Impairment	0	0
Transfer in (out)	151,157	230,955
Transfer from (to) investment properties	(88,336)	(140,229)
Acquisition and disposition of businesses	49,532	0
Others	137	66,341
Ending, net	2,518,130	2,554,561	2,517,422
Buildings and structures [member] | Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning, net	4,830,853	4,707,250
Ending, net	4,903,073	4,830,853	4,707,250
Buildings and structures [member] | Accumulated depreciation, amortisation and impairment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning, net	(2,276,292)	(2,189,828)
Ending, net	(2,384,943)	(2,276,292)	(2,189,828)
Machinery and equipment1 [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning, net	9,613,829	9,316,571
Acquisition and capital expenditure	75,412	129,754
Disposal and termination	(70,418)	(76,608)
Depreciation	(2,495,402)	(2,413,191)
Impairment	(6,577)	(6,084)
Transfer in (out)	2,706,444	2,660,753
Acquisition and disposition of businesses	(14,981)	(4,386)
Others	(1,628)	7,020
Ending, net	9,806,679	9,613,829	9,316,571
Machinery and equipment1 [member] | Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning, net	42,091,573	40,270,005
Ending, net	43,611,280	42,091,573	40,270,005
Machinery and equipment1 [member] | Accumulated depreciation, amortisation and impairment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning, net	(32,477,744)	(30,953,434)
Ending, net	(33,804,601)	(32,477,744)	(30,953,434)
Others [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning, net	223,436	221,238
Acquisition and capital expenditure	78,400	67,921
Disposal and termination	(1,711)	(4,695)
Depreciation	(75,900)	(79,376)
Impairment	(1)	(7,825)
Transfer in (out)	16,407	31,036
Acquisition and disposition of businesses	(44,543)	(481)
Others	(7,742)	(4,382)
Ending, net	188,346	223,436	221,238
Others [member] | Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning, net	1,276,779	1,607,853
Ending, net	1,182,144	1,276,779	1,607,853
Others [member] | Accumulated depreciation, amortisation and impairment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning, net	(1,053,343)	(1,386,615)
Ending, net	(993,798)	(1,053,343)	(1,386,615)
Construction-in-progress [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning, net	1,107,545	1,093,858
Acquisition and capital expenditure	3,029,380	3,105,283
Disposal and termination	(327)	(3,926)
Impairment	(1,294)	(2,247)
Transfer in (out)	(3,092,670)	(3,010,193)
Transfer from (to) investment properties	(189)	(2,676)
Acquisition and disposition of businesses	(3,205)	(3,720)
Others	(4,692)	(68,834)
Ending, net	1,034,548	1,107,545	1,093,858
Construction-in-progress [member] | Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning, net	1,108,043	1,094,479
Ending, net	1,035,198	1,108,043	1,094,479
Construction-in-progress [member] | Accumulated depreciation, amortisation and impairment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning, net	(498)	(621)
Ending, net	₩ (650)	₩ (498)	₩ (621)

Property and Equipment - Summ_2

Property and Equipment - Summary of the Details of Property and Equipment and Investment Properties Provided (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Disclosure of detailed information about property, plant and equipment [line items]
Related amount	₩ 10,218,165	₩ 10,006,685
Land and buildings [member] | Industrial Bank of Korea [member]
Disclosure of detailed information about property, plant and equipment [line items]
Carrying amount	81,057	13,899
Secured amount	₩ 64,680	₩ 19,100
Related line item	Borrowings	Borrowings
Related amount	₩ 54,900	₩ 6,000
Secured party	Industrial Bank of Korea, etc.	Industrial Bank of Korea, etc.
Land and buildings [member] | Lessee [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Carrying amount	₩ 555,921	₩ 460,166
Secured amount	₩ 64,877	₩ 61,733
Related line item	Deposits	Deposits
Related amount	₩ 55,965	₩ 52,662
Secured party	Lessee	Lessee

Property and Equipment - Additi

Property and Equipment - Additional Information (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure of detailed information about property, plant and equipment [line items]
Borrowing cost capitalized	₩ 17,671	₩ 9,954	₩ 5,360
Bottom of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Interest rate of capitalized borrowing cost	1.86%	1.85%	1.85%
Top of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Interest rate of capitalized borrowing cost	7.28%	7.42%	2.45%

Investment Properties - Summary

Investment Properties - Summary of Investment Properties (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Disclosure of detailed information about investment property [line items]
Beginning balance	₩ 1,933,358	₩ 1,720,654
Acquisition	210,808	87,398
Disposal and termination	(17,490)	(20,600)
Depreciation	(52,869)	(47,004)
Transfer from (to) property and equipment	126,250	206,183
Transfer and others	(1,922)	(13,273)
Ending balance	2,198,135	1,933,358
Gross carrying amount [member]
Disclosure of detailed information about investment property [line items]
Beginning balance	2,596,204	2,306,198
Ending balance	2,922,705	2,596,204
Accumulated depreciation and amortisation [member]
Disclosure of detailed information about investment property [line items]
Beginning balance	(662,846)	(585,544)
Ending balance	(724,570)	(662,846)
Land [member]
Disclosure of detailed information about investment property [line items]
Beginning balance	879,792	813,763
Acquisition	0	14,569
Disposal and termination	(8,167)	(14,725)
Transfer from (to) property and equipment	37,725	63,278
Transfer and others	1	2,907
Ending balance	909,351	879,792
Land [member] | Gross carrying amount [member]
Disclosure of detailed information about investment property [line items]
Beginning balance	881,360	815,331
Ending balance	910,919	881,360
Land [member] | Accumulated depreciation and amortisation [member]
Disclosure of detailed information about investment property [line items]
Beginning balance	(1,568)	(1,568)
Ending balance	(1,568)	(1,568)
Buildings [member]
Disclosure of detailed information about investment property [line items]
Beginning balance	916,458	840,090
Acquisition	57,529	17,351
Disposal and termination	(9,323)	(5,858)
Depreciation	(52,869)	(47,004)
Transfer from (to) property and equipment	88,336	140,229
Transfer and others	27,544	(28,350)
Ending balance	1,027,675	916,458
Buildings [member] | Gross carrying amount [member]
Disclosure of detailed information about investment property [line items]
Beginning balance	1,577,736	1,424,066
Ending balance	1,750,677	1,577,736
Buildings [member] | Accumulated depreciation and amortisation [member]
Disclosure of detailed information about investment property [line items]
Beginning balance	(661,278)	(583,976)
Ending balance	(723,002)	(661,278)
Investment property, construction-in-progress [Member]
Disclosure of detailed information about investment property [line items]
Beginning balance	137,108	66,801
Acquisition	153,279	55,478
Disposal and termination	0	(17)
Transfer from (to) property and equipment	189	2,676
Transfer and others	(29,467)	12,170
Ending balance	261,109	137,108
Investment property, construction-in-progress [Member] | Gross carrying amount [member]
Disclosure of detailed information about investment property [line items]
Beginning balance	137,108	66,801
Ending balance	₩ 261,109	₩ 137,108

Investment Properties - Additio

Investment Properties - Additional Information (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure of detailed information about investment property [line items]
Fair value of investment properties	₩ 5,276,169	₩ 5,370,047
Rental income from investment properties	224,016	₩ 206,127	₩ 185,877
Future minimum lease fee	251,262
Less than 1 year [member]
Disclosure of detailed information about investment property [line items]
Future minimum lease fee	101,738
1-5 years [member]
Disclosure of detailed information about investment property [line items]
Future minimum lease fee	130,707
More than 5 years [member]
Disclosure of detailed information about investment property [line items]
Future minimum lease fee	₩ 18,817

Intangible Assets - Summary of

Intangible Assets - Summary of Intangible Assets (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure of detailed information about intangible assets [line items]
Beginning, net	₩ 3,129,833	₩ 3,447,333
Acquisition and capital expenditure	309,737	346,989
Disposal and termination	(11,640)	(25,668)
Amortization	(691,909)	(627,261)	₩ (604,744)
Impairment	(236,207)	(30,674)
Acquisition and disposition of businesses	6,030	(10,266)
Others	28,017	29,380
Ending, net	2,533,861	3,129,833	3,447,333
Gross carrying amount [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	8,148,293	7,942,556
Ending, net	8,163,459	8,148,293	7,942,556
Accumulated depreciation and amortisation [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	(5,018,460)	(4,495,223)
Ending, net	(5,629,598)	(5,018,460)	(4,495,223)
Goodwill [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	708,223	696,872
Acquisition and capital expenditure		19,455
Impairment	(230,352)	(24,006)
Acquisition and disposition of businesses	6,207	0
Others	4,349	15,902
Ending, net	488,427	708,223	696,872
Goodwill [member] | Gross carrying amount [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	1,037,887	1,002,530
Ending, net	1,036,354	1,037,887	1,002,530
Goodwill [member] | Accumulated depreciation and amortisation [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	(329,664)	(305,658)
Ending, net	(547,927)	(329,664)	(305,658)
Development costs [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	171,856	228,373
Acquisition and capital expenditure	33,078	45,997
Disposal and termination	(4,812)	(5,503)
Amortization	(63,052)	(93,374)
Impairment	(128)	(744)
Acquisition and disposition of businesses		(2,320)
Others	1,658	(573)
Ending, net	138,600	171,856	228,373
Development costs [member] | Gross carrying amount [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	1,803,687	1,812,377
Ending, net	1,790,446	1,803,687	1,812,377
Development costs [member] | Accumulated depreciation and amortisation [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	(1,631,831)	(1,584,004)
Ending, net	(1,651,846)	(1,631,831)	(1,584,004)
Software [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	155,076	139,425
Acquisition and capital expenditure	38,603	55,651
Disposal and termination	(397)	(48)
Amortization	(52,265)	(54,748)
Impairment	(16)	(508)
Acquisition and disposition of businesses	(108)	(802)
Others	11,769	16,106
Ending, net	152,662	155,076	139,425
Software [member] | Gross carrying amount [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	1,156,951	1,083,426
Ending, net	1,196,329	1,156,951	1,083,426
Software [member] | Accumulated depreciation and amortisation [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	(1,001,875)	(944,001)
Ending, net	(1,043,667)	(1,001,875)	(944,001)
Frequency usage rights [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	1,488,256	1,839,131
Acquisition and capital expenditure	37
Amortization	(350,276)	(350,265)
Others	175	(610)
Ending, net	1,138,192	1,488,256	1,839,131
Frequency usage rights [member] | Gross carrying amount [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	2,617,707	2,617,647
Ending, net	2,415,243	2,617,707	2,617,647
Frequency usage rights [member] | Accumulated depreciation and amortisation [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	(1,129,451)	(778,516)
Ending, net	(1,277,051)	(1,129,451)	(778,516)
Others [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	606,422	543,532
Acquisition and capital expenditure	238,019	225,886
Disposal and termination	(6,431)	(20,117)
Amortization	(226,316)	(128,874)
Impairment	(5,711)	(5,416)
Acquisition and disposition of businesses	(69)	(7,144)
Others	10,066	(1,445)
Ending, net	615,980	606,422	543,532
Others [member] | Gross carrying amount [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	1,532,061	1,426,576
Ending, net	1,725,087	1,532,061	1,426,576
Others [member] | Accumulated depreciation and amortisation [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	(925,639)	(883,044)
Ending, net	₩ (1,109,107)	₩ (925,639)	₩ (883,044)

Intangible Assets - Summary o_2

Intangible Assets - Summary of Intangible Assets (Parenthetical) (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Statement [Line Items]
Changed effect of useful life	₩ 52,179
Goodwill not subject to amortization	₩ 212,910	₩ 210,114

Intangible Assets - Summary o_3

Intangible Assets - Summary of Goodwill Allocated to Each Cash-Generation Unit (Detail) ₩ in Millions	Dec. 31, 2023 KRW (₩)
Disclosure of detailed information about intangible assets [line items]
Goodwill	₩ 488,427
Mobile services [member] | ICT [member]
Disclosure of detailed information about intangible assets [line items]
Goodwill	65,057
BC Card Co., Ltd. [member] | Finance [member]
Disclosure of detailed information about intangible assets [line items]
Goodwill	41,234
KT Telecop Co., Ltd. [member] | Others [member]
Disclosure of detailed information about intangible assets [line items]
Goodwill	15,418
KT MOS Bukbu Co Ltd and others [member] | Others [member]
Disclosure of detailed information about intangible assets [line items]
Goodwill	45,799
HCN Co Ltd [Member] | Satellite TV [member]
Disclosure of detailed information about intangible assets [line items]
Goodwill	130,242
MILLIE Co Ltd [Member] | Others [member]
Disclosure of detailed information about intangible assets [line items]
Goodwill	54,725
Epsilon Global Communications Pte Ltd [Member] | Others [member]
Disclosure of detailed information about intangible assets [line items]
Goodwill	45,670
GENIE Music Corporation [Member] | Others [member]
Disclosure of detailed information about intangible assets [line items]
Goodwill	50,214
PlayD Co., Ltd. [Member] | Others [member]
Disclosure of detailed information about intangible assets [line items]
Goodwill	₩ 40,068

Intangible Assets - Summary o_4

Intangible Assets - Summary of Goodwill Allocated to Each Cash-Generation Unit (Parenthetical) (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure of detailed information about intangible assets [line items]
Goodwill	₩ 488,427
Mobile services [member] | ICT [member]
Disclosure of detailed information about intangible assets [line items]
Terminal growth rate	0%
Discount rate	6.68%
Impairment loss on goodwill	₩ 0	₩ 0	₩ 0
Mobile services [member] | Bottom of range [member] | ICT [member]
Disclosure of detailed information about intangible assets [line items]
Expected revenue growth rate	0.56%
Mobile services [member] | Top of range [member] | ICT [member]
Disclosure of detailed information about intangible assets [line items]
Expected revenue growth rate	9.14%
Marketing [member] | Mobile services [member]
Disclosure of detailed information about intangible assets [line items]
Terminal growth rate	0%
Expected revenue growth rate	0.56%
Discount rate	6.68%
Impairment loss on goodwill	₩ 0	0	0
Finance [member] | BC Card Co., Ltd. [member]
Disclosure of detailed information about intangible assets [line items]
Terminal growth rate	0%
Expected revenue growth rate	0.04%
Discount rate	5.22%
Impairment loss on goodwill	₩ 0	0	0
Description of calculation of recoverable amount	The recoverable amounts of BC Card Co., Ltd. are calculated based on value-in use calculations. These calculations use discounted cash flow projections for the next five years based on financial budgets. A terminal growth rate of 0.0% was applied for the cash flows expected to be incurred after five years. This growth rate does not exceed the average growth rate of the industry which the cash-generating unit belongs in. The Group estimated its revenue growth rate 0.04% based on past performance and its expectation of future market changes. In addition, management estimated the cash flow based on past performance and its expectation of market growth, and the discount rates 5.22% used reflected specific risks relating to the relevant CGU. As a result of the impairment test, the Group concluded that the carrying amount of CGU does not exceed the recoverable amount. Accordingly, the Group did not recognize an impairment loss on goodwill on BC Card Co., Ltd. for the years ended December 31, 2021, 2022 and 2023.
Goodwill	₩ 41,234
Others [member] | BOOK CLUB MILLIE [Member]
Disclosure of detailed information about intangible assets [line items]
Terminal growth rate	1%
Expected revenue growth rate	9.96%
Discount rate	22.48%
Impairment loss on goodwill	₩ 0
Others [member] | MEDIA GENIE Co Ltd [Member]
Disclosure of detailed information about intangible assets [line items]
Terminal growth rate	1%
Expected revenue growth rate	10.57%
Discount rate	8.84%
Impairment loss on goodwill	₩ 45,670
Goodwill	₩ 118,609
Others [member] | KT Telecop Co., Ltd. [member]
Disclosure of detailed information about intangible assets [line items]
Terminal growth rate	1%
Expected revenue growth rate	3.54%
Discount rate	9.04%
Impairment loss on goodwill	₩ 0	₩ 0	₩ 0
Goodwill	₩ 15,418
Others [member] | GENIE Music Corporation [Member]
Disclosure of detailed information about intangible assets [line items]
Terminal growth rate	0%
Expected revenue growth rate	4.51%
Discount rate	16.73%
Impairment loss on goodwill	₩ 0
Description of calculation of recoverable amount	The recoverable amounts of GENIE Music Corporation are calculated based on value-in use calculations. These calculations use discounted cash flow projections for the next five years based on financial budgets. A terminal growth rate of 0.0% was applied for the cash flows expected to be incurred after five years. This growth rate does not exceed the average growth rate of the industry which the cash-generating unit belongs in. The Group estimated its revenue growth rate 4.51% based on past performance and its expectation of future market changes. In addition, management estimated the cash flow based on past performance and its expectation of market growth, and the discount rates 16.73% used reflected specific risks relating to the relevant CGU. As a result of the impairment test, the Group concluded that the carrying amount of CGU does not exceed the recoverable amount. Accordingly, the Group did not recognize an impairment loss on goodwill on GENIE Music Corporation for the years ended December 31, 2023.
Goodwill	₩ 50,214
Satellite TV [member] | HCN Co Ltd [Member]
Disclosure of detailed information about intangible assets [line items]
Terminal growth rate	0%
Expected revenue growth rate	2.21%
Discount rate	11.37%
Impairment loss on goodwill	₩ 130,242
Goodwill	₩ 98,432

Investments in Associates and_3

Investments in Associates and Joint Ventures - Summary of Details of Associates (Detail)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
KIF Investment Fund [Member]
Disclosure of associates [line items]
Percentage of ownership	33.33%	33.33%
Location	Korea	Korea
Date of financial statements	December	December
K Bank [member]
Disclosure of associates [line items]
Percentage of ownership	33.72%	33.72%
Location	Korea	Korea
Date of financial statements	December	December
Hyundai Robotics Co., Ltd. [member]
Disclosure of associates [line items]
Percentage of ownership	10%	10%
Location	Korea	Korea
Date of financial statements	December	December
Megazone Cloud Corporation [Member]
Disclosure of associates [line items]
Percentage of ownership	6.83%	6.83%
Location	Korea	Korea
Date of financial statements	December	December
IGIS No. 4681 General Private Real Estate Investment Company [Member]
Disclosure of associates [line items]
Percentage of ownership	44.64%	44.64%
Location	Korea	Korea
Date of financial statements	December	December
KT-DSC creative economy youth start-up investment fund [member]
Disclosure of associates [line items]
Percentage of ownership	28.57%	28.57%
Location	Korea	Korea
Date of financial statements	December	December
IGIS Professional Investors Private Investment Real Estate Investment LLC No.395 [Member]
Disclosure of associates [line items]
Percentage of ownership	35.29%	35.29%
Location	Korea	Korea
Date of financial statements	December	December
LS Marine Solution Co Ltd Formerly KT Submarine Co Ltd [Member]
Disclosure of associates [line items]
Percentage of ownership	7.30%	32.90%
Location	Korea	Korea
Date of financial statements	December	December

Investments in Associates and_4

Investments in Associates and Joint Ventures - Summary of Changes in Investments in Associates and Joint Ventures (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Disclosure Of Associates And Joint Ventures [Line Items]
Beginning	₩ 1,480,722	₩ 1,288,429
Acquisition (Disposal)	101,387	255,041
Share of net profit (loss) from associates and joint ventures	(35,634)	(16,821)
Others	10,414	(45,927)
Ending	1,556,889	1,480,722
KIF Investment Fund [Member]
Disclosure Of Associates And Joint Ventures [Line Items]
Beginning	170,979	178,935
Share of net profit (loss) from associates and joint ventures	5,443	2,502
Others	632	(10,458)
Ending	177,054	170,979
K Bank [member]
Disclosure Of Associates And Joint Ventures [Line Items]
Beginning	852,756	831,737
Acquisition (Disposal)	0
Share of net profit (loss) from associates and joint ventures	1,089	29,010
Others	19,036	(7,991)
Ending	872,881	852,756
Hyundai Robotics Co., Ltd. [member]
Disclosure Of Associates And Joint Ventures [Line Items]
Beginning	49,372	48,725
Acquisition (Disposal)	0
Share of net profit (loss) from associates and joint ventures	(1,637)	798
Others	(1)	(151)
Ending	47,734	49,372
Megazone Cloud Corporation [Member]
Disclosure Of Associates And Joint Ventures [Line Items]
Beginning	136,199
Acquisition (Disposal)		130,001
Share of net profit (loss) from associates and joint ventures	(4,583)	(22,555)
Others	78	28,753
Ending	131,694	136,199
IGIS No. 4681 General Private Real Estate Investment Company [Member]
Disclosure Of Associates And Joint Ventures [Line Items]
Beginning	23,589
Acquisition (Disposal)		25,000
Share of net profit (loss) from associates and joint ventures	(105)	(1,411)
Ending	23,484	23,589
KT-DSC creative economy youth start-up investment fund [member]
Disclosure Of Associates And Joint Ventures [Line Items]
Beginning	22,123	22,138
Acquisition (Disposal)	(500)
Share of net profit (loss) from associates and joint ventures	3,494	(13)
Others		(2)
Ending	25,117	22,123
IGIS Professional Investors Private Investment Real Estate Investment LLC No.395 [Member]
Disclosure Of Associates And Joint Ventures [Line Items]
Beginning	16,620	17,084
Share of net profit (loss) from associates and joint ventures	(4,678)	(464)
Ending	11,942	16,620
Others [member]
Disclosure Of Associates And Joint Ventures [Line Items]
Beginning	209,084
Acquisition (Disposal)	101,887
Share of net profit (loss) from associates and joint ventures	(34,912)
Others	(32,568)
Ending	243,491	209,084
Other associates and joint ventures [member]
Disclosure Of Associates And Joint Ventures [Line Items]
Beginning	209,084	189,810
Acquisition (Disposal)		100,040
Share of net profit (loss) from associates and joint ventures		(24,688)
Others		(56,078)
Ending		209,084
LS Marine Solution Co Ltd Formerly KT Submarine Co Ltd [Member]
Disclosure Of Associates And Joint Ventures [Line Items]
Beginning	0
Share of net profit (loss) from associates and joint ventures	255
Others	23,237
Ending	₩ 23,492	₩ 0

Investments in Associates and_5

Investments in Associates and Joint Ventures - Summary of Financial Information of Associates and Joint Ventures (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure Of Associates And Joint Ventures [Line Items]
Current assets	₩ 14,594,246	₩ 12,690,014
Non-current assets	28,197,401	28,299,796
Current liabilities	13,247,637	10,699,268
Non-current liabilities	11,001,436	11,877,846
Operating revenue	26,287,201	25,638,855	₩ 24,898,005
Profit (loss) for the year	972,182	1,385,635	1,459,395
Other comprehensive income(loss)	7,447	(2,194)	165,567
Total comprehensive income(loss)	979,629	1,383,441	₩ 1,624,962
K Bank Inc.[Member]
Disclosure Of Associates And Joint Ventures [Line Items]
Current assets	21,320,790	16,562,742
Non-current assets	89,812	71,265
Current liabilities	19,541,076	14,830,983
Non-current liabilities	4,516	2,168
Operating revenue	946,559	558,872
Profit (loss) for the year	10,560	86,498
Other comprehensive income(loss)	56,609	(24,888)
Total comprehensive income(loss)	67,169	61,610
Hyundai Robotics Co., Ltd. [member]
Disclosure Of Associates And Joint Ventures [Line Items]
Current assets	251,868	278,413
Non-current assets	134,424	135,380
Current liabilities	106,557	63,009
Non-current liabilities	9,775	64,335
Operating revenue	167,949	181,944
Profit (loss) for the year	(17,513)	9,332
Other comprehensive income(loss)	(1,093)	(49)
Total comprehensive income(loss)	(18,606)	9,283
KIF Investment Fund [Member]
Disclosure Of Associates And Joint Ventures [Line Items]
Current assets	128,344	98,132
Non-current assets	402,819	414,804
Operating revenue	33,017	19,916
Profit (loss) for the year	16,330	7,505
Other comprehensive income(loss)	0	(11,779)
Total comprehensive income(loss)	16,330	(4,274)
Dividends received from associates	1,139	6,531
Megazone Cloud Corporation [Member]
Disclosure Of Associates And Joint Ventures [Line Items]
Current assets	874,778	857,089
Non-current assets	267,605	202,767
Current liabilities	341,679	330,619
Non-current liabilities	205,087	94,202
Operating revenue	1,410,078	1,261,228
Profit (loss) for the year	(34,760)	(293,186)
Other comprehensive income(loss)	(3,021)	(6,609)
Total comprehensive income(loss)	(37,781)	(299,795)
IGIS No. 4681 General Private Real Estate Investment Company [Member]
Disclosure Of Associates And Joint Ventures [Line Items]
Current assets	2,985	52,851
Non-current assets	49,631
Current liabilities	11	12
Operating revenue	6	9
Profit (loss) for the year	(234)	(3,161)
Total comprehensive income(loss)	(234)	(3,161)
KT-DSC creative economy youth start-up investment fund [member]
Disclosure Of Associates And Joint Ventures [Line Items]
Current assets	482	908
Non-current assets	87,528	76,884
Current liabilities	101	362
Operating revenue	19,849	19,931
Profit (loss) for the year	12,227	(53)
Total comprehensive income(loss)	12,227	(53)
IGIS Professional Investors Private Investment Real Estate Investment LLC No.395 [Member]
Disclosure Of Associates And Joint Ventures [Line Items]
Current assets	5,690	9,344
Non-current assets	145,769	127,321
Current liabilities	107,553	90,545
Profit (loss) for the year	(406)	(474)
Total comprehensive income(loss)	(406)	₩ (474)
LS Marine Solution Co Ltd Formerly KT Submarine Co Ltd [Member]
Disclosure Of Associates And Joint Ventures [Line Items]
Current assets	66,767
Non-current assets	80,307
Current liabilities	23,906
Non-current liabilities	207
Operating revenue	70,779
Profit (loss) for the year	11,618
Other comprehensive income(loss)	(289)
Total comprehensive income(loss)	₩ 11,329

Investments in Associates and_6

Investments in Associates and Joint Ventures - Summary of Reconciliation of Carrying Amount of Interests in the Associates and Joint Ventures (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Disclosure Of Associates And Joint Ventures [Line Items]
Book amount	₩ 1,556,889	₩ 1,480,722
K Bank [member]
Disclosure Of Associates And Joint Ventures [Line Items]
Net assets	₩ 1,865,010	₩ 1,800,856
Percentage of ownership	33.72%	33.72%
Share in net assets	₩ 628,910	₩ 607,276
Intercompany transaction and others	243,971	245,480
Book amount	872,881	852,756
Hyundai Robotics Co., Ltd. [member]
Disclosure Of Associates And Joint Ventures [Line Items]
Net assets	₩ 269,960	₩ 286,449
Percentage of ownership	10%	10%
Share in net assets	₩ 26,996	₩ 28,645
Intercompany transaction and others	20,738	20,727
Book amount	47,734	49,372
KIF Investment Fund [Member]
Disclosure Of Associates And Joint Ventures [Line Items]
Net assets	₩ 531,164	₩ 512,936
Percentage of ownership	33.33%	33.33%
Share in net assets	₩ 177,054	₩ 170,979
Book amount	177,054	170,979
Megazone Cloud Corporation [Member]
Disclosure Of Associates And Joint Ventures [Line Items]
Net assets	₩ 547,786	₩ 635,035
Percentage of ownership	6.83%	6.83%
Share in net assets	₩ 37,404	₩ 43,360
Intercompany transaction and others	94,290	92,839
Book amount	131,694	136,199
IGIS No. 4681 General Private Real Estate Investment Company [Member]
Disclosure Of Associates And Joint Ventures [Line Items]
Net assets	₩ 52,605	₩ 52,839
Percentage of ownership	44.64%	44.64%
Share in net assets	₩ 23,484	₩ 23,589
Book amount	23,484	23,589
KT-DSC creative economy youth start-up investment fund [member]
Disclosure Of Associates And Joint Ventures [Line Items]
Net assets	₩ 87,908	₩ 77,430
Percentage of ownership	28.57%	28.57%
Share in net assets	₩ 25,117	₩ 22,123
Book amount	25,117	22,123
IGIS Professional Investors Private Investment Real Estate Investment LLC No.395 [Member]
Disclosure Of Associates And Joint Ventures [Line Items]
Net assets	₩ 43,905	₩ 46,120
Percentage of ownership	35.29%	35.29%
Share in net assets	₩ 15,496	₩ 16,278
Intercompany transaction and others	(3,554)	342
Book amount	11,942	₩ 16,620
LS Marine Solution Co Ltd Formerly KT Submarine Co Ltd [Member]
Disclosure Of Associates And Joint Ventures [Line Items]
Net assets	₩ 122,961
Percentage of ownership	7.30%	32.90%
Share in net assets	₩ 8,972
Intercompany transaction and others	14,520
Book amount	₩ 23,492

Investments in Associates and_7

Investments in Associates and Joint Ventures - Additional Information (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure of associates [abstract]
Loss from associates and joint ventures not recognized	₩ 833	₩ 909	₩ 717
Accumulated comprehensive loss of associates and joint ventures not recognized	₩ 10,748	₩ 9,915

Trade and Other Payables - Summ

Trade and Other Payables - Summary of Trade and Other Payables (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2023	Dec. 31, 2022
Current liabilities
Trade payables	₩ 1,297,752	₩ 1,150,515
Other payables	6,757,170	6,182,650
Total	8,054,922	7,333,165
Non-current liabilities
Trade payables	3,202	0
Other payables	816,356	1,064,099
Total	₩ 819,558	₩ 1,064,099

Trade and Other Payables - Su_2

Trade and Other Payables - Summary of Other Payables (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2023	Dec. 31, 2022
Trade and other payables [abstract]
Non-trade payables	₩ 5,207,165	₩ 4,981,300
Accrued expenses	1,267,700	1,234,023
Operating deposits	880,810	818,603
Others	217,851	212,823
Less: non-current	(816,356)	(1,064,099)
Current	₩ 6,757,170	₩ 6,182,650

Trade and Other Payables - Su_3

Trade and Other Payables - Summary of Other Payables (Parenthetical) (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Trade and other payables [abstract]
Credit Sale Liabilities Settlement Payable	₩ 2,314,077	₩ 1,754,075

Borrowings - Summary of Borrowi

Borrowings - Summary of Borrowings (Detail) ¥ in Thousands, $ in Thousands, $ in Thousands, ₩ in Millions	12 Months Ended
	Dec. 31, 2023 KRW (₩)	Dec. 31, 2023 USD ($)	Dec. 31, 2023 JPY (¥)	Dec. 31, 2022 KRW (₩)	Dec. 31, 2022 USD ($)	Dec. 31, 2022 JPY (¥)	Dec. 31, 2022 SGD ($)
Disclosure of detailed information about borrowings [line items]
Annual interest rates	0%	0%	0%
Less: Current portion	₩ (3,058,564)			₩ (1,827,042)
Borrowings	10,218,165			10,006,685
Gross carrying amount [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	₩ 10,236,958
Gross carrying amount [member] | Sept. 07, 2034 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Sep. 7, 2034
Annual interest rates	6.50%	6.50%	6.50%
Gross carrying amount [member] | July 18, 2026 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jul. 18, 2026
Annual interest rates	2.50%	2.50%	2.50%
Gross carrying amount [member] | Aug 23, 2023 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Aug. 23, 2023
Gross carrying amount [member] | July 19, 2024 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jul. 19, 2024
Annual interest rates	0.33%	0.33%	0.33%
Gross carrying amount [member] | Sept. 1, 2025 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Sep. 1. 2025
Annual interest rates	1%	1%	1%
Gross carrying amount [member] | Nov 01, 2024 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Nov. 1, 2024
Annual interest rates description	Compounded SOFR+1.210
Annual interest rates adjustment rate	1.21%	1.21%	1.21%
Gross carrying amount [member] | Jun. 19. 2023 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jun. 19, 2023
Gross carrying amount [member] | Jan, 21, 2027 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jan. 21, 2027
Annual interest rates	1.375%	1.375%	1.375%
Gross carrying amount [member] | Dec. 22, 2031 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Dec. 22, 2031
Annual interest rates	4.27%	4.27%	4.27%
Gross carrying amount [member] | Apr. 10, 2023 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Apr. 10, 2023
Gross carrying amount [member] | Apr. 10, 2033 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Apr. 10, 2033
Annual interest rates	3.17%	3.17%	3.17%
Gross carrying amount [member] | June 26, 2024 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jun. 26, 2024
Annual interest rates	3.418%	3.418%	3.418%
Gross carrying amount [member] | June 26, 2034 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jun. 26, 2034
Annual interest rates	3.695%	3.695%	3.695%
Gross carrying amount [member] | Sept. 02, 2024 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Sep. 2, 2024
Annual interest rates	3.314%	3.314%	3.314%
Gross carrying amount [member] | Sept. 02, 2034 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Sep. 2, 2034
Annual interest rates	3.546%	3.546%	3.546%
Gross carrying amount [member] | Jan. 29, 2025 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jan. 29, 2025
Annual interest rates	2.454%	2.454%	2.454%
Gross carrying amount [member] | Jan. 29, 2035 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jan. 29, 2035
Annual interest rates	2.706%	2.706%	2.706%
Gross carrying amount [member] | Jan. 28, 2026 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jan. 28, 2026
Annual interest rates	2.203%	2.203%	2.203%
Gross carrying amount [member] | Jan. 28, 2036 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jan. 28, 2036
Annual interest rates	2.351%	2.351%	2.351%
Gross carrying amount [member] | Jan. 30, 2023 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jan. 30, 2023
Gross carrying amount [member] | Jan. 30, 2028 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jan. 30, 2028
Annual interest rates	2.947%	2.947%	2.947%
Gross carrying amount [member] | Jan. 30, 2038 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jan. 30, 2038
Annual interest rates	2.931%	2.931%	2.931%
Gross carrying amount [member] | Oct, 11, 2024 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Oct. 11, 2024
Annual interest rates	1.578%	1.578%	1.578%
Gross carrying amount [member] | Oct, 11, 2029 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Oct. 11, 2029
Annual interest rates	1.622%	1.622%	1.622%
Gross carrying amount [member] | Oct, 11, 2039 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Oct. 11, 2039
Annual interest rates	1.674%	1.674%	1.674%
Gross carrying amount [member] | June 16, 2023 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jun. 16, 2023
Gross carrying amount [member] | June 17, 2025 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jun. 17, 2025
Annual interest rates	1.434%	1.434%	1.434%
Gross carrying amount [member] | June 17, 2030 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jun. 17, 2030
Annual interest rates	1.608%	1.608%	1.608%
Gross carrying amount [member] | June 15, 2040 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jun. 15, 2040
Annual interest rates	1.713%	1.713%	1.713%
Gross carrying amount [member] | Jan, 26, 2024 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jan. 26, 2024
Annual interest rates	1.127%	1.127%	1.127%
Gross carrying amount [member] | Jan, 27, 2026 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jan. 27, 2026
Annual interest rates	1.452%	1.452%	1.452%
Gross carrying amount [member] | Jan, 27, 2031 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jan. 27, 2031
Annual interest rates	1.849%	1.849%	1.849%
Gross carrying amount [member] | Jan, 25, 2041 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jan. 25, 2041
Annual interest rates	1.976%	1.976%	1.976%
Gross carrying amount [member] | Jun. 10. 2024 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jun. 10, 2024
Annual interest rates	1.387%	1.387%	1.387%
Gross carrying amount [member] | Jun. 10. 2026 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jun. 10, 2026
Annual interest rates	1.806%	1.806%	1.806%
Gross carrying amount [member] | Jun. 10. 2031 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jun. 10, 2031
Annual interest rates	2.168%	2.168%	2.168%
Gross carrying amount [member] | Jul. 02. 2024 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jul. 2, 2024
Annual interest rates	1.844%	1.844%	1.844%
Gross carrying amount [member] | Jul. 02. 2026 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jul. 2, 2026
Annual interest rates	2.224%	2.224%	2.224%
Gross carrying amount [member] | Jun. 23. 2023 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jun. 23, 2023
Gross carrying amount [member] | Mar. 08. 2024 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Mar. 8, 2024
Annual interest rates	1.44%	1.44%	1.44%
Gross carrying amount [member] | Mar. 10. 2026 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Mar. 10, 2026
Annual interest rates	1.756%	1.756%	1.756%
Gross carrying amount [member] | Apr. 07. 2023 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Apr. 7, 2023
Gross carrying amount [member] | Apr. 08. 2024 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Apr. 8, 2024
Annual interest rates	1.462%	1.462%	1.462%
Gross carrying amount [member] | May 12. 2023 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	May 12, 2023
Gross carrying amount [member] | May 14. 2024 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	May 14, 2024
Annual interest rates	1.432%	1.432%	1.432%
Gross carrying amount [member] | Aug. 30. 2024 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Aug. 30, 2024
Annual interest rates	1.813%	1.813%	1.813%
Gross carrying amount [member] | Aug. 28. 2026 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Aug. 28, 2026
Annual interest rates	1.982%	1.982%	1.982%
Gross carrying amount [member] | Nov. 10. 2023 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Nov. 10, 2023
Gross carrying amount [member] | Nov. 11. 2024 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Nov. 11, 2024
Annual interest rates	2.425%	2.425%	2.425%
Gross carrying amount [member] | Jan. 23. 2025 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jan. 23, 2025
Annual interest rates	2.511%	2.511%	2.511%
Gross carrying amount [member] | Aug. 08. 2025 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Aug. 08, 2025
Annual interest rates	4%	4%	4%
Gross carrying amount [member] | Jan. 15. 2024 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jan. 15, 2024
Annual interest rates	2.088%	2.088%	2.088%
Gross carrying amount [member] | Jan. 15. 2029 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jan. 15, 2029
Annual interest rates	2.16%	2.16%	2.16%
Gross carrying amount [member] | Jan. 14. 2039 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jan. 14, 2039
Annual interest rates	2.213%	2.213%	2.213%
Gross carrying amount [member] | Jan. 27. 2025 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jan. 27, 2025
Annual interest rates	2.596%	2.596%	2.596%
Gross carrying amount [member] | Jan. 27. 2027 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jan. 27, 2027
Annual interest rates	2.637%	2.637%	2.637%
Gross carrying amount [member] | Jan. 27. 2032 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jan. 27, 2032
Annual interest rates	2.741%	2.741%	2.741%
Gross carrying amount [member] | Jun. 27. 2025 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jun. 27, 2025
Annual interest rates	4.191%	4.191%	4.191%
Gross carrying amount [member] | Jun. 29. 2027 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jun. 29, 2027
Annual interest rates	4.188%	4.188%	4.188%
Gross carrying amount [member] | Jan. 10. 2025 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jan. 10, 2025
Annual interest rates	3.847%	3.847%	3.847%
Gross carrying amount [member] | Jan. 12. 2026 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jan. 12, 2026
Annual interest rates	3.869%	3.869%	3.869%
Gross carrying amount [member] | Jan. 12. 2028 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jan. 12, 2028
Annual interest rates	3.971%	3.971%	3.971%
Gross carrying amount [member] | Jul. 11. 2025 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jul. 11, 2025
Annual interest rates	4.028%	4.028%	4.028%
Gross carrying amount [member] | Jul. 10. 2026 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jul. 10, 2026
Annual interest rates	4.146%	4.146%	4.146%
Gross carrying amount [member] | Jul. 12. 2028 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jul. 12, 2028
Annual interest rates	4.221%	4.221%	4.221%
Gross carrying amount [member] | Feb. 29. 2024 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Feb. 29, 2024
Annual interest rates	2.615%	2.615%	2.615%
Gross carrying amount [member] | Sep. 2. 2024 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Sep. 2, 2024
Annual interest rates	2.745%	2.745%	2.745%
Gross carrying amount [member] | Feb. 28. 2025 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Feb. 28, 2025
Annual interest rates	2.88%	2.88%	2.88%
Gross carrying amount [member] | Mar. 25. 2025 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Mar. 25, 2025
Annual interest rates description	5Y CMS+0.404
Annual interest rates adjustment rate	0.404%	0.404%	0.404%
Gross carrying amount [member] | Mar. 25. 2032 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Mar. 25, 2032
Annual interest rates description	10Y CMS+0.965
Annual interest rates adjustment rate	0.965%	0.965%	0.965%
Gross carrying amount [member] | Apr. 28. 2023 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Apr. 28, 2023
Gross carrying amount [member] | oct. 27. 2023 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Oct. 27, 2023
Gross carrying amount [member] | Jan. 27. 2025 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jan. 27, 2025
Annual interest rates	4.421%	4.421%	4.421%
Gross carrying amount [member] | Aug. 09. 2024 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Aug. 09, 2024
Annual interest rates	4.267%	4.267%	4.267%
Gross carrying amount [member] | Aug. 11. 2027 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Aug. 11, 2027
Annual interest rates	4.505%	4.505%	4.505%
Gross carrying amount [member] | Jun.14. 2024 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jun. 14, 2024
Annual interest rates	5.615%	5.615%	5.615%
Gross carrying amount [member] | Dec. 13. 2024 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Dec. 13, 2024
Annual interest rates	5.667%	5.667%	5.667%
Gross carrying amount [member] | Dec. 12. 2025 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Dec. 12, 2025
Annual interest rates	5.769%	5.769%	5.769%
Gross carrying amount [member] | Jun. 21. 2024 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jun. 21, 2024
Annual interest rates	5.527%	5.527%	5.527%
Gross carrying amount [member] | Dec. 20. 2024 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Dec. 20, 2024
Annual interest rates	5.557%	5.557%	5.557%
Gross carrying amount [member] | Jun. 20. 2025 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jun. 20, 2025
Annual interest rates	5.594%	5.594%	5.594%
Gross carrying amount [member] | Dec. 22. 2025 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Dec. 22, 2025
Annual interest rates	5.615%	5.615%	5.615%
Gross carrying amount [member] | Dec. 27. 2023 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Dec. 27, 2023
Gross carrying amount [member] | Jan. 26. 2024 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jan. 26, 2024
Annual interest rates	5.069%	5.069%	5.069%
Gross carrying amount [member] | Apr. 26. 2024 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Apr. 26, 2024
Annual interest rates	5.08%	5.08%	5.08%
Gross carrying amount [member] | Feb. 20. 2026 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Feb. 20, 2026
Annual interest rates	4.059%	4.059%	4.059%
Gross carrying amount [member] | Feb. 22. 2028 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Feb. 22, 2028
Annual interest rates	4.311%	4.311%	4.311%
Gross carrying amount [member] | Apr. 12. 2024 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Apr. 12, 2024
Annual interest rates	3.778%	3.778%	3.778%
Gross carrying amount [member] | Oct. 24. 2024 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Oct. 24, 2024
Annual interest rates	3.821%	3.821%	3.821%
Gross carrying amount [member] | Apr. 14. 2028 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Apr. 14, 2028
Annual interest rates	4.22%	4.22%	4.22%
Gross carrying amount [member] | May. 09. 2025 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	May. 09, 2025
Annual interest rates	3.87%	3.87%	3.87%
Gross carrying amount [member] | Nov. 09. 2026 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Nov. 09, 2026
Annual interest rates	3.932%	3.932%	3.932%
Gross carrying amount [member] | May. 07. 2027 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	May. 07, 2027
Annual interest rates	3.972%	3.972%	3.972%
Gross carrying amount [member] | Nov. 22. 2024 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Nov. 22. 2024
Annual interest rates	4.205%	4.205%	4.205%
Gross carrying amount [member] | Apr. 22. 2025 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Apr. 22. 2025
Annual interest rates	4.31%	4.31%	4.31%
Gross carrying amount [member] | May. 21. 2025 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	May. 21. 2025
Annual interest rates	4.332%	4.332%	4.332%
Gross carrying amount [member] | May. 22. 2025 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	May. 22. 2025
Annual interest rates	4.332%	4.332%	4.332%
Gross carrying amount [member] | Dec. 20. 2024 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Dec. 20. 2024
Annual interest rates	3.865%	3.865%	3.865%
Gross carrying amount [member] | Jan. 22. 2025 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jan. 22. 2025
Annual interest rates	3.864%	3.864%	3.864%
Gross carrying amount [member] | Feb. 21. 2025 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Feb. 21. 2025
Annual interest rates	3.864%	3.864%	3.864%
Gross carrying amount [member] | Dec. 22. 2025 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Dec. 22. 2025
Annual interest rates	3.858%	3.858%	3.858%
Debentures [member]
Disclosure of detailed information about borrowings [line items]
Less: Current portion	₩ (1,924,523)			(1,154,101)
Discount on bonds	(19,248)			(23,728)
Borrowings	6,503,150			7,228,522
Debentures [member] | Gross carrying amount [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	8,446,921			8,406,351
Debentures [member] | Gross carrying amount [member] | Sept. 07, 2034 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	128,940	$ 100,000		126,730	$ 100,000
Debentures [member] | Gross carrying amount [member] | July 18, 2026 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	515,760	400,000		506,920	400,000
Debentures [member] | Gross carrying amount [member] | Aug 23, 2023 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings				126,730	100,000
Debentures [member] | Gross carrying amount [member] | July 19, 2024 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	3,651		¥ 400,000	3,813		¥ 400,000
Debentures [member] | Gross carrying amount [member] | Sept. 1, 2025 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	515,760	400,000		506,920	400,000
Debentures [member] | Gross carrying amount [member] | Nov 01, 2024 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	451,290	350,000		443,555	350,000
Debentures [member] | Gross carrying amount [member] | Jun. 19. 2023 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings				267,843			$ 284,000
Debentures [member] | Gross carrying amount [member] | Jan, 21, 2027 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	386,820	300,000		380,190	300,000
Debentures [member] | Gross carrying amount [member] | Dec. 22, 2031 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	160,000			160,000
Debentures [member] | Gross carrying amount [member] | Apr. 10, 2023 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings				190,000
Debentures [member] | Gross carrying amount [member] | Apr. 10, 2033 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	100,000			100,000
Debentures [member] | Gross carrying amount [member] | June 26, 2024 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	110,000			110,000
Debentures [member] | Gross carrying amount [member] | June 26, 2034 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	100,000			100,000
Debentures [member] | Gross carrying amount [member] | Sept. 02, 2024 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	170,000			170,000
Debentures [member] | Gross carrying amount [member] | Sept. 02, 2034 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	100,000			100,000
Debentures [member] | Gross carrying amount [member] | Jan. 29, 2025 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	240,000			240,000
Debentures [member] | Gross carrying amount [member] | Jan. 29, 2035 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	50,000			50,000
Debentures [member] | Gross carrying amount [member] | Jan. 28, 2026 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	100,000			100,000
Debentures [member] | Gross carrying amount [member] | Jan. 28, 2036 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	70,000			70,000
Debentures [member] | Gross carrying amount [member] | Jan. 30, 2023 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings				150,000
Debentures [member] | Gross carrying amount [member] | Jan. 30, 2028 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	170,000			170,000
Debentures [member] | Gross carrying amount [member] | Jan. 30, 2038 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	70,000			70,000
Debentures [member] | Gross carrying amount [member] | Oct, 11, 2024 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	100,000			100,000
Debentures [member] | Gross carrying amount [member] | Oct, 11, 2029 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	50,000			50,000
Debentures [member] | Gross carrying amount [member] | Oct, 11, 2039 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	110,000			110,000
Debentures [member] | Gross carrying amount [member] | June 16, 2023 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings				150,000
Debentures [member] | Gross carrying amount [member] | June 17, 2025 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	70,000			70,000
Debentures [member] | Gross carrying amount [member] | June 17, 2030 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	20,000			20,000
Debentures [member] | Gross carrying amount [member] | June 15, 2040 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	60,000			60,000
Debentures [member] | Gross carrying amount [member] | Jan, 26, 2024 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	130,000			130,000
Debentures [member] | Gross carrying amount [member] | Jan, 27, 2026 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	140,000			140,000
Debentures [member] | Gross carrying amount [member] | Jan, 27, 2031 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	50,000			50,000
Debentures [member] | Gross carrying amount [member] | Jan, 25, 2041 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	80,000			80,000
Debentures [member] | Gross carrying amount [member] | Jun. 10. 2024 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	180,000			180,000
Debentures [member] | Gross carrying amount [member] | Jun. 10. 2026 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	80,000			80,000
Debentures [member] | Gross carrying amount [member] | Jun. 10. 2031 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	40,000			40,000
Debentures [member] | Gross carrying amount [member] | Jul. 02. 2024 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	100,000			100,000
Debentures [member] | Gross carrying amount [member] | Jul. 02. 2026 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	50,000			50,000
Debentures [member] | Gross carrying amount [member] | Jun. 23. 2023 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings				100,000
Debentures [member] | Gross carrying amount [member] | Mar. 08. 2024 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	70,000			70,000
Debentures [member] | Gross carrying amount [member] | Mar. 10. 2026 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	30,000			30,000
Debentures [member] | Gross carrying amount [member] | Apr. 07. 2023 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings				20,000
Debentures [member] | Gross carrying amount [member] | Apr. 08. 2024 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	30,000			30,000
Debentures [member] | Gross carrying amount [member] | May 12. 2023 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings				10,000
Debentures [member] | Gross carrying amount [member] | May 14. 2024 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	40,000			40,000
Debentures [member] | Gross carrying amount [member] | Aug. 30. 2024 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	80,000			80,000
Debentures [member] | Gross carrying amount [member] | Aug. 28. 2026 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	20,000			20,000
Debentures [member] | Gross carrying amount [member] | Nov. 10. 2023 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings				30,000
Debentures [member] | Gross carrying amount [member] | Nov. 11. 2024 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	70,000			70,000
Debentures [member] | Gross carrying amount [member] | Jan. 23. 2025 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	40,000			40,000
Debentures [member] | Gross carrying amount [member] | Aug. 08. 2025 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	644,700	$ 500,000		633,650	$ 500,000
Debentures [member] | Gross carrying amount [member] | Jan. 15. 2024 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	80,000			80,000
Debentures [member] | Gross carrying amount [member] | Jan. 15. 2029 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	110,000			110,000
Debentures [member] | Gross carrying amount [member] | Jan. 14. 2039 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	90,000			90,000
Debentures [member] | Gross carrying amount [member] | Jan. 27. 2025 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	270,000			270,000
Debentures [member] | Gross carrying amount [member] | Jan. 27. 2027 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	100,000			100,000
Debentures [member] | Gross carrying amount [member] | Jan. 27. 2032 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	30,000			30,000
Debentures [member] | Gross carrying amount [member] | Jun. 27. 2025 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	280,000			280,000
Debentures [member] | Gross carrying amount [member] | Jun. 29. 2027 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	120,000			120,000
Debentures [member] | Gross carrying amount [member] | Jan. 10. 2025 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	70,000
Debentures [member] | Gross carrying amount [member] | Jan. 12. 2026 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	150,000
Debentures [member] | Gross carrying amount [member] | Jan. 12. 2028 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	80,000
Debentures [member] | Gross carrying amount [member] | Jul. 11. 2025 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	85,000
Debentures [member] | Gross carrying amount [member] | Jul. 10. 2026 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	160,000
Debentures [member] | Gross carrying amount [member] | Jul. 12. 2028 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	155,000
Debentures [member] | Gross carrying amount [member] | Feb. 29. 2024 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	50,000			50,000
Debentures [member] | Gross carrying amount [member] | Sep. 2. 2024 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	20,000			20,000
Debentures [member] | Gross carrying amount [member] | Feb. 28. 2025 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	20,000			20,000
Debentures [member] | Gross carrying amount [member] | Mar. 25. 2025 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	60,000			60,000
Debentures [member] | Gross carrying amount [member] | Mar. 25. 2032 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	40,000			40,000
Debentures [member] | Gross carrying amount [member] | Apr. 28. 2023 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings				30,000
Debentures [member] | Gross carrying amount [member] | oct. 27. 2023 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings				30,000
Debentures [member] | Gross carrying amount [member] | Jan. 27. 2025 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	50,000			50,000
Debentures [member] | Gross carrying amount [member] | Aug. 09. 2024 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	30,000			30,000
Debentures [member] | Gross carrying amount [member] | Aug. 11. 2027 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	30,000			30,000
Debentures [member] | Gross carrying amount [member] | Jun.14. 2024 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	20,000			20,000
Debentures [member] | Gross carrying amount [member] | Dec. 13. 2024 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	20,000			20,000
Debentures [member] | Gross carrying amount [member] | Dec. 12. 2025 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	30,000			30,000
Debentures [member] | Gross carrying amount [member] | Jun. 21. 2024 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	10,000			10,000
Debentures [member] | Gross carrying amount [member] | Dec. 20. 2024 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	20,000			20,000
Debentures [member] | Gross carrying amount [member] | Jun. 20. 2025 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	30,000			30,000
Debentures [member] | Gross carrying amount [member] | Dec. 22. 2025 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	10,000			10,000
Debentures [member] | Gross carrying amount [member] | Dec. 27. 2023 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings				50,000
Debentures [member] | Gross carrying amount [member] | Jan. 26. 2024 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	40,000			40,000
Debentures [member] | Gross carrying amount [member] | Apr. 26. 2024 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	10,000			₩ 10,000
Debentures [member] | Gross carrying amount [member] | Feb. 20. 2026 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	20,000
Debentures [member] | Gross carrying amount [member] | Feb. 22. 2028 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	80,000
Debentures [member] | Gross carrying amount [member] | Apr. 12. 2024 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	10,000
Debentures [member] | Gross carrying amount [member] | Oct. 24. 2024 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	30,000
Debentures [member] | Gross carrying amount [member] | Apr. 14. 2028 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	30,000
Debentures [member] | Gross carrying amount [member] | May. 09. 2025 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	30,000
Debentures [member] | Gross carrying amount [member] | Nov. 09. 2026 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	10,000
Debentures [member] | Gross carrying amount [member] | May. 07. 2027 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	30,000
Debentures [member] | Gross carrying amount [member] | Nov. 22. 2024 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	20,000
Debentures [member] | Gross carrying amount [member] | Apr. 22. 2025 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	40,000
Debentures [member] | Gross carrying amount [member] | May. 21. 2025 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	10,000
Debentures [member] | Gross carrying amount [member] | May. 22. 2025 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	40,000
Debentures [member] | Gross carrying amount [member] | Dec. 20. 2024 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	30,000
Debentures [member] | Gross carrying amount [member] | Jan. 22. 2025 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	50,000
Debentures [member] | Gross carrying amount [member] | Feb. 21. 2025 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	10,000
Debentures [member] | Gross carrying amount [member] | Dec. 22. 2025 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	₩ 10,000

Borrowings - Summary of Borro_2

Borrowings - Summary of Borrowings (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2023
The 1561st Won Denominated Unsecured Bond March Twenty Five Twenty Twenty Five [member]
Disclosure of detailed information about borrowings [line items]
CMS rate	2.993%
The 1562nd Won Denominated Unsecured Bond March Twenty Five Twenty Thirty Two [member]
Disclosure of detailed information about borrowings [line items]
CMS rate	2.99%
Fr Notes November One Twenty Twenty Four [member]
Disclosure of detailed information about borrowings [line items]
Borrowings interest rate basis spread on SOFR rate	5.38%
Borrowings, interest rate basis	SOFR+1.210
Borrowings, adjustment to interest rate basis	1.21%

Borrowings - Summary of Korean

Borrowings - Summary of Korean Won and Foreign Currency Borrowings (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Disclosure of detailed information about borrowings [line items]
Annual interest rates	0%
Borrowings	₩ 10,218,165	₩ 10,006,685
Redemption premium	2,267	4,565
Bond discount issuance	(1,811)	(7,206)
Current portion	(8,456)
The 1st CB(Private) Jun. 5, 2020 and The First Unsecured Cb Jul.25.2022 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	₩ 8,456	35,359
The 1st CB(Private) Jun. 5, 2025 [member] | The 1st CB(Private) Jun. 5, 2020 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jun. 5, 2025
Annual interest rates	2%
Borrowings	₩ 8,000	8,000
The First Unsecured Cb January Five Twenty Twenty Five [Member] | The First Unsecured Cb July Twenty Five Twenty Two [Member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jan. 25, 2025
Borrowings		₩ 30,000

Borrowings - Summary of Korea_2

Borrowings - Summary of Korean Won and Foreign Currency Borrowings (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2023 shares
Disclosure of detailed information about borrowings [line items]
Interest rate	0%
Maturity yield	5%
Storywiz Co Ltd [Member]
Disclosure of detailed information about borrowings [line items]
Appraisal period of common stock conversion to debt	(appraisal period: June 5, 2021~May 4, 2025)
KT Cloud [Member]
Disclosure of detailed information about borrowings [line items]
Conversion of bonds to common shares, shares	73,800
Conversion of bonds to preference shares, shares	73,800

Borrowings - Summary of Short-t

Borrowings - Summary of Short-term Borrowing (Detail) ₩ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2023 KRW (₩)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 KRW (₩)	Dec. 31, 2022 USD ($)
Disclosure of detailed information about borrowings [line items]
Annual interest rates	0%	0%
Short-term borrowings [member]
Disclosure of detailed information about borrowings [line items]
Short-term borrowings	₩ 425,785	$ 504,998
Short-term borrowings [member] | NongHyup Bank [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	4.88%	4.88%
Short-term borrowings	₩ 8,500		₩ 9,000
Short-term borrowings [member] | Shinhan Bank [member]
Disclosure of detailed information about borrowings [line items]
Short-term borrowings	₩ 151,500		105,000
Short-term borrowings [member] | Shinhan Bank [member] | Bottom of range [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	3.84%	3.84%
Short-term borrowings [member] | Shinhan Bank [member] | Top of range [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	6.43%	6.43%
Short-term borrowings [member] | Shinhan Bank 1 [Member]
Disclosure of detailed information about borrowings [line items]
Short-term borrowings			30,000
Short-term borrowings [member] | Korea Development Bank [member]
Disclosure of detailed information about borrowings [line items]
Short-term borrowings	₩ 34,900		27,201
Short-term borrowings [member] | Korea Development Bank [member] | Bottom of range [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	3.23%	3.23%
Short-term borrowings [member] | Korea Development Bank [member] | Top of range [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	4.95%	4.95%
Short-term borrowings [member] | Woori Bank [Member]
Disclosure of detailed information about borrowings [line items]
Short-term borrowings			50,000
Short-term borrowings [member] | Industrial Bank Of Korea [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	4.862%	4.862%
Short-term borrowings	₩ 6,000		6,000
Short-term borrowings [member] | Hana Bank [Member]
Disclosure of detailed information about borrowings [line items]
Short-term borrowings	₩ 4,800		5,000
Annual interest rates description	CD(91D)+0.126
Short-term borrowings [member] | KB SECURITIES [Member]
Disclosure of detailed information about borrowings [line items]
Short-term borrowings	₩ 69,635		94,822
Short-term borrowings [member] | KB SECURITIES [Member] | Bottom of range [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	4.11%	4.11%
Short-term borrowings [member] | KB SECURITIES [Member] | Top of range [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	4.91%	4.91%
Short-term borrowings [member] | NH INVESTMENT SECURITIES [Member]
Disclosure of detailed information about borrowings [line items]
Short-term borrowings			20,000
Short-term borrowings [member] | HSBC [member]
Disclosure of detailed information about borrowings [line items]
Short-term borrowings	₩ 30,450	$ 23,600	23,451	$ 18,500
Annual interest rates description	SOFR +2.100
Short-term borrowings [member] | IBK Securities [Member]
Disclosure of detailed information about borrowings [line items]
Short-term borrowings			20,000
Short-term borrowings [member] | Hi Investment Securities [Member]
Disclosure of detailed information about borrowings [line items]
Short-term borrowings			99,524
Short-term borrowings [member] | Woori Bank One [Member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	4.40%	4.40%
Short-term borrowings	₩ 70,000
Short-term borrowings [member] | Nong Hyup Bank One [Member]
Disclosure of detailed information about borrowings [line items]
Short-term borrowings			₩ 15,000
Short-term borrowings [member] | Woori Bank Two [member]
Disclosure of detailed information about borrowings [line items]
Short-term borrowings	₩ 20,000
Annual interest rates description	CD(91D)+1.960
Short-term borrowings [member] | Korea Investment [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	4.91%	4.91%
Short-term borrowings	₩ 30,000

Borrowings - Summary of Short_2

Borrowings - Summary of Short-term Borrowing (Parenthetical) (Detail)	Dec. 31, 2023
Hana Bank [Member]
Disclosure of detailed information about borrowings [line items]
LIBOR rate	3.82%
HSBC [member]
Disclosure of detailed information about borrowings [line items]
LIBOR rate	5.38%

Borrowings - Summary of Long-te

Borrowings - Summary of Long-term Borrowings (Detail) € in Millions, ₩ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2023 KRW (₩)	Dec. 31, 2023 USD ($)	Dec. 31, 2023 EUR (€)	Dec. 31, 2022 KRW (₩)	Dec. 31, 2022 USD ($)	Dec. 31, 2022 EUR (€)
Disclosure of detailed information about borrowings [line items]
Annual interest rates	0%	0%	0%
Borrowings	₩ 10,218,165			₩ 10,006,685
Total	7,159,601			8,179,643
Long-term borrowings [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	1,356,251			1,083,705
Less: Current portion	(699,800)			(167,943)
Total	₩ 656,451			915,762
Long-term borrowings [member] | General loans [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates description	CD(91D)+0.750
Borrowings	₩ 32,000
Long-term borrowings [member] | Export-Import Bank of Korea [member] | Inter-Korean Cooperation Fund [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	1%	1%	1%
Borrowings	₩ 1,480			1,974
Long-term borrowings [member] | Shinhan Bank [member]
Disclosure of detailed information about borrowings [line items]
Borrowings | $		$ 8,910			$ 8,910
Long-term borrowings [member] | Shinhan Bank [member] | General loans [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates description	Term SOFR(3M)+1.100
Borrowings	₩ 11,489			11,292
Long-term borrowings [member] | Shinhan Bank [member] | General Loans 1 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings				48,158	38,000
Long-term borrowings [member] | Shinhan Bank [member] | General Loans 2 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	₩ 40,655	$ 31,472		39,855	31,472
Long-term borrowings [member] | Shinhan Bank [member] | General Loans 2 [member] | Bottom of range [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	1.90%	1.90%	1.90%
Long-term borrowings [member] | Shinhan Bank [member] | General Loans 2 [member] | Top of range [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	3.20%	3.20%	3.20%
Long-term borrowings [member] | Shinhan Bank [member] | General Loans 3 [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	4.49%	4.49%	4.49%
Borrowings	₩ 62,398			62,398
Long-term borrowings [member] | Shinhan Bank [member] | General Loans 4 [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates description	Term SOFR(3M)+1.300
Borrowings	₩ 27,241	$ 21,127		26,774	$ 21,127
Long-term borrowings [member] | Shinhan Bank [member] | General Loans 5 [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates description	Term SOFR(3M)+1.940
Borrowings	₩ 45,129	$ 35,000
Long-term borrowings [member] | Shinhan Bank [member] | General Loans 6 [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates description	CD(91D)+1.800
Borrowings	₩ 16,900
Long-term borrowings [member] | Shinhan Bank [member] | General Loans 7 [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates description	EURIBOR(3M)+0.900
Borrowings	₩ 10,985		€ 7,700	10,404		€ 7,700
Long-term borrowings [member] | CA-CIB [member] | General loans [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	₩ 200,000			200,000
Long-term borrowings [member] | CA-CIB [member] | General loans [member] | Bottom of range [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	3.38%	3.38%	3.38%
Long-term borrowings [member] | CA-CIB [member] | General loans [member] | Top of range [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	4.15%	4.15%	4.15%
Long-term borrowings [member] | Korea Development Bank [member] | General loans [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	₩ 137,000			38,000
Long-term borrowings [member] | Korea Development Bank [member] | General loans [member] | Bottom of range [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	3%	3%	3%
Long-term borrowings [member] | Korea Development Bank [member] | General loans [member] | Top of range [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	4.87%	4.87%	4.87%
Long-term borrowings [member] | Woori Bank [Member] | General loans [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	₩ 41,526			15,000
Long-term borrowings [member] | Woori Bank [Member] | General loans [member] | Bottom of range [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	3.32%	3.32%	3.32%
Long-term borrowings [member] | Woori Bank [Member] | General loans [member] | Top of range [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	5.80%	5.80%	5.80%
Long-term borrowings [member] | Woori Bank [Member] | PF Loans [Member]
Disclosure of detailed information about borrowings [line items]
Borrowings				40,682
Long-term borrowings [member] | Kyobo Life Insurance [Member] | PF Loans [Member]
Disclosure of detailed information about borrowings [line items]
Borrowings	₩ 84,586			66,390
Long-term borrowings [member] | Kyobo Life Insurance [Member] | PF Loans [Member] | Bottom of range [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates description	CD(91D)+1.150
Long-term borrowings [member] | Kyobo Life Insurance [Member] | PF Loans [Member] | Top of range [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates description	CD(91D) +3.450
Long-term borrowings [member] | Samsung Life Insurance [Member] | PF Loans [Member]
Disclosure of detailed information about borrowings [line items]
Borrowings	₩ 46,992			36,883
Long-term borrowings [member] | Samsung Life Insurance [Member] | PF Loans [Member] | Bottom of range [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	1.86%	1.86%	1.86%
Long-term borrowings [member] | Samsung Life Insurance [Member] | PF Loans [Member] | Top of range [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	4.16%	4.16%	4.16%
Long-term borrowings [member] | JPM [Member] | General loans [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	₩ 200,000			100,000
Long-term borrowings [member] | JPM [Member] | General loans [member] | Bottom of range [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	2.70%	2.70%	2.70%
Long-term borrowings [member] | JPM [Member] | General loans [member] | Top of range [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	4.48%	4.48%	4.48%
Long-term borrowings [member] | DBS [Member] | General loans [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	4.079%	4.079%	4.079%
Borrowings	₩ 100,000			100,000
Long-term borrowings [member] | Hi Investment Securities [Member] | CP [Member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	2.302%	2.302%	2.302%
Borrowings	₩ 92,994			90,724
Long-term borrowings [member] | NH Jayang [Member] | PF Loans [Member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates description	CD(91D)+1.150
Borrowings	₩ 53,033			59,066
Long-term borrowings [member] | Standard Chartered Bank Korea [Member] | PF Loans [Member]
Disclosure of detailed information about borrowings [line items]
Borrowings	₩ 56,390			44,260
Long-term borrowings [member] | Standard Chartered Bank Korea [Member] | PF Loans [Member] | Bottom of range [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates description	CD(91D)+1.150
Long-term borrowings [member] | Standard Chartered Bank Korea [Member] | PF Loans [Member] | Top of range [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates description	CD(91D) +3.450
Long-term borrowings [member] | Bookook investment [member] | CP [Member]
Disclosure of detailed information about borrowings [line items]
Borrowings	₩ 19,525			18,806
Long-term borrowings [member] | Bookook investment [member] | CP [Member] | Bottom of range [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	3.49%	3.49%	3.49%
Long-term borrowings [member] | Bookook investment [member] | CP [Member] | Top of range [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	3.603%	3.603%	3.603%
Long-term borrowings [member] | Korea Investment [member] | CP [Member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	3.622%	3.622%	3.622%
Borrowings	₩ 75,928			₩ 73,039

Borrowings - Summary of Long-_2

Borrowings - Summary of Long-term Borrowings (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2023
Disclosure of detailed information about borrowings [line items]
Long term debt repayment	The above Inter-Korean Cooperation Fund is repayable in installments over 13 years after a seven-year grace period.
Vessel facility loans [member] | Shinhan Bank [member]
Disclosure of detailed information about borrowings [line items]
LIBOR rate	5.331%
Vessel facility loans [member] | Woori Bank [Member]
Disclosure of detailed information about borrowings [line items]
LIBOR rate	3.909%
Vessel facility loans [member] | NH Jayang [Member]
Disclosure of detailed information about borrowings [line items]
LIBOR rate	3.82%

Borrowings - Summary of Repayme

Borrowings - Summary of Repayment of Debentures and Borrowings Including the Current Liabilities (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2023	Dec. 31, 2022
Disclosure of detailed information about borrowings [line items]
Borrowings	₩ 10,218,165	₩ 10,006,685
Long-term borrowings [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	1,356,251	₩ 1,083,705
Gross carrying amount [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	10,236,958
Gross carrying amount [member] | Bonds [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	8,454,921
Gross carrying amount [member] | Bonds [member] | In local currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	5,808,000
Gross carrying amount [member] | Bonds [member] | In foreign currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	2,646,921
Gross carrying amount [member] | Long-term borrowings [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	1,782,037
Gross carrying amount [member] | Long-term borrowings [member] | In local currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	1,616,088
Gross carrying amount [member] | Long-term borrowings [member] | In foreign currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	165,949
Gross carrying amount [member] | Jan 1, 2023 - Dec 31, 2023 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	3,058,526
Gross carrying amount [member] | Jan 1, 2023 - Dec 31, 2023 [member] | Bonds [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	1,932,941
Gross carrying amount [member] | Jan 1, 2023 - Dec 31, 2023 [member] | Bonds [member] | In local currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	1,478,000
Gross carrying amount [member] | Jan 1, 2023 - Dec 31, 2023 [member] | Bonds [member] | In foreign currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	454,941
Gross carrying amount [member] | Jan 1, 2023 - Dec 31, 2023 [member] | Long-term borrowings [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	1,125,585
Gross carrying amount [member] | Jan 1, 2023 - Dec 31, 2023 [member] | Long-term borrowings [member] | In local currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	1,016,254
Gross carrying amount [member] | Jan 1, 2023 - Dec 31, 2023 [member] | Long-term borrowings [member] | In foreign currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	109,331
Gross carrying amount [member] | Jan 1, 2024 - Dec 31, 2024 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	3,083,400
Gross carrying amount [member] | Jan 1, 2024 - Dec 31, 2024 [member] | Bonds [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	2,605,460
Gross carrying amount [member] | Jan 1, 2024 - Dec 31, 2024 [member] | Bonds [member] | In local currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	1,445,000
Gross carrying amount [member] | Jan 1, 2024 - Dec 31, 2024 [member] | Bonds [member] | In foreign currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	1,160,460
Gross carrying amount [member] | Jan 1, 2024 - Dec 31, 2024 [member] | Long-term borrowings [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	477,940
Gross carrying amount [member] | Jan 1, 2024 - Dec 31, 2024 [member] | Long-term borrowings [member] | In local currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	421,322
Gross carrying amount [member] | Jan 1, 2024 - Dec 31, 2024 [member] | Long-term borrowings [member] | In foreign currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	56,618
Gross carrying amount [member] | Jan 1, 2025 - Dec 31, 2025 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	1,384,847
Gross carrying amount [member] | Jan 1, 2025 - Dec 31, 2025 [member] | Bonds [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	1,275,760
Gross carrying amount [member] | Jan 1, 2025 - Dec 31, 2025 [member] | Bonds [member] | In local currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	760,000
Gross carrying amount [member] | Jan 1, 2025 - Dec 31, 2025 [member] | Bonds [member] | In foreign currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	515,760
Gross carrying amount [member] | Jan 1, 2025 - Dec 31, 2025 [member] | Long-term borrowings [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	109,087
Gross carrying amount [member] | Jan 1, 2025 - Dec 31, 2025 [member] | Long-term borrowings [member] | In local currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	109,087
Gross carrying amount [member] | Jan 1, 2026 - Dec 31, 2026 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	682,420
Gross carrying amount [member] | Jan 1, 2026 - Dec 31, 2026 [member] | Bonds [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	666,820
Gross carrying amount [member] | Jan 1, 2026 - Dec 31, 2026 [member] | Bonds [member] | In local currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	280,000
Gross carrying amount [member] | Jan 1, 2026 - Dec 31, 2026 [member] | Bonds [member] | In foreign currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	386,820
Gross carrying amount [member] | Jan 1, 2026 - Dec 31, 2026 [member] | Long-term borrowings [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	15,600
Gross carrying amount [member] | Jan 1, 2026 - Dec 31, 2026 [member] | Long-term borrowings [member] | In local currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	15,600
Gross carrying amount [member] | After 2027 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	2,027,765
Gross carrying amount [member] | After 2027 [member] | Bonds [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	1,973,940
Gross carrying amount [member] | After 2027 [member] | Bonds [member] | In local currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	1,845,000
Gross carrying amount [member] | After 2027 [member] | Bonds [member] | In foreign currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	128,940
Gross carrying amount [member] | After 2027 [member] | Long-term borrowings [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	53,825
Gross carrying amount [member] | After 2027 [member] | Long-term borrowings [member] | In local currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	53,825
Gross carrying amount [member] | After 2027 [member] | Long-term borrowings [member] | In foreign currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	₩ 0

Provisions - Summary of Changes

Provisions - Summary of Changes in Provisions (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Disclosure of other provisions [line items]
Beginning balance	₩ 200,366	₩ 257,397
Increase (Transfer)	37,629	24,879
Usage	(14,708)	(30,081)
Reversal	(2,784)	(51,789)
Scope change	(177)
Others	1,897	(40)
Ending balance	222,223	200,366
Current	115,209	109,133
Non-current	107,014	91,233
Litigation [member]
Disclosure of other provisions [line items]
Beginning balance	36,329	80,165
Increase (Transfer)	592	6,005
Usage	(7,179)	(6,155)
Reversal	(35)	(43,686)
Ending balance	29,707	36,329
Current	29,130	34,730
Non-current	577	1,599
Restoration cost [member]
Disclosure of other provisions [line items]
Beginning balance	108,962	107,358
Increase (Transfer)	26,381	13,027
Usage	(1,138)	(8,143)
Reversal	(653)	(3,685)
Others	(393)	405
Ending balance	133,159	108,962
Current	26,945	19,918
Non-current	106,214	89,044
Others [member]
Disclosure of other provisions [line items]
Beginning balance	55,075	69,874
Increase (Transfer)	10,656	5,847
Usage	(6,391)	(15,783)
Reversal	(2,096)	(4,418)
Scope change	(177)
Others	2,290	(445)
Ending balance	59,357	55,075
Current	59,134	54,485
Non-current	₩ 223	₩ 590

Net Defined Benefit Liabiliti_3

Net Defined Benefit Liabilities (Assets) - Summary of Amount Recognized in the Statements of Financial Position (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2023	Dec. 31, 2022
Disclosure of net defined benefit liability (asset) [abstract]
Present value of defined benefit obligations	₩ 2,365,793	₩ 2,218,655
Fair value of plan assets	(2,462,925)	(2,478,143)
Liabilities	63,616	51,654
Assets	₩ 160,748	₩ 311,142

Net Defined Benefit Liabiliti_4

Net Defined Benefit Liabilities (Assets) - Summary of Changes in the Defined Benefit Obligations (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure of net defined benefit liability (asset) [Line Items]
Current service cost	₩ (213,922)	₩ (238,068)	₩ (249,125)
Interest expense	(17,462)	3,139	5,047
Remeasurements:
Acquisition and disposition of businesses, etc.	(5,564)	8,587	5,128
Present value of defined benefit obligation [member]
Disclosure of net defined benefit liability (asset) [Line Items]
Beginning balance	2,218,655	2,494,930
Current service cost	213,489	238,068
Interest expense	103,874	59,041
Benefit paid	(358,298)	(316,047)
Changes due to settlements of plan & Past Service Cost	1	(701)
Remeasurements:
Actuarial gains (losses) arising from changes in demographic assumptions	1,903	(13,048)
Actuarial gains (losses) arising from changes in financial assumptions	138,462	(323,501)
Actuarial gains arising from experience adjustments	48,174	80,845
Acquisition and disposition of businesses, etc.	(467)	(932)
Ending balance	₩ 2,365,793	₩ 2,218,655	₩ 2,494,930

Net Defined Benefit Liabiliti_5

Net Defined Benefit Liabilities (Assets) - Summary of Changes in the Fair Value of Plan Assets (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure of net defined benefit liability (asset) [Line Items]
Interest income	₩ (17,462)	₩ 3,139	₩ 5,047
Plan assets [member]
Disclosure of net defined benefit liability (asset) [Line Items]
Beginning	2,478,143	2,314,632
Interest income	121,336	55,902
Remeasurements:
Return on plan assets (excluding amounts included in interest income)	9,410	(8,542)
Benefits paid	(307,762)	(287,419)
Employer contributions	165,128	401,358
Changes in scope of consolidation, etc.	(3,330)	2,212
Ending	₩ 2,462,925	₩ 2,478,143	₩ 2,314,632

Net Defined Benefit Liabiliti_6

Net Defined Benefit Liabilities (Assets) - Summary of Amounts Recognized in the Consolidated Statements of Operations (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Changes in net defined benefit liability (asset) [abstract]
Current service cost	₩ 213,922	₩ 238,068	₩ 249,125
Net Interest cost	(17,462)	3,139	5,047
Changes due to settlements of plan & Past Service Cost	1	(701)	(681)
Transfer out	(13,435)	(15,102)	(16,660)
Total expenses	₩ 183,026	₩ 225,404	₩ 236,831

Net Defined Benefit Liabiliti_7

Net Defined Benefit Liabilities (Assets) - Summary of Principal Actuarial Assumptions (Detail)	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Bottom of range [member]
Disclosure of defined benefit plans [line items]
Discount rate	3.67%	2.40%	2.10%
Salary growth rate	1.70%	1.82%	1%
Top of range [member]
Disclosure of defined benefit plans [line items]
Discount rate	5.51%	6.29%	3.70%
Salary growth rate	8.96%	8.90%	6.97%

Net Defined Benefit Liabiliti_8

Net Defined Benefit Liabilities (Assets) - Summary of Sensitivity of the Defined Benefit Obligations (Detail) ₩ in Millions	Dec. 31, 2023 KRW (₩)
Discount rate [member]
Disclosure of sensitivity analysis for actuarial assumptions [Line items]
Percentage changes in assumption	0.50%
Effect on defined benefit obligation, increase in assumption	₩ (139,461)
Effect on defined benefit obligation, decrease in assumption	₩ 150,568
Salary growth rate [member]
Disclosure of sensitivity analysis for actuarial assumptions [Line items]
Percentage changes in assumption	0.50%
Effect on defined benefit obligation, increase in assumption	₩ 145,687
Effect on defined benefit obligation, decrease in assumption	₩ (135,431)

Net Defined Benefit Liabiliti_9

Net Defined Benefit Liabilities (Assets) - Additional Information (Detail) ₩ in Millions	12 Months Ended
	Dec. 31, 2023 KRW (₩)
Disclosure of net defined benefit liability (asset) [Line Items]
Expected contributions to post-employment benefit plans	₩ 273,503
Weighted average duration of the defined benefit obligations	6 years 2 months 12 days

Net Defined Benefit Liabilit_10

Net Defined Benefit Liabilities (Assets) - Summary of Expected Maturity Analysis of Undiscounted Pension Benefits (Detail) ₩ in Millions	Dec. 31, 2023 KRW (₩)
Disclosure of net defined benefit liability (asset) [Line Items]
Pension benefits	₩ 3,556,910
Less than 1 year [member]
Disclosure of net defined benefit liability (asset) [Line Items]
Pension benefits	257,315
Between 1-2 years [member]
Disclosure of net defined benefit liability (asset) [Line Items]
Pension benefits	376,352
Between 2-5 years [member]
Disclosure of net defined benefit liability (asset) [Line Items]
Pension benefits	910,076
More than 5 years [member]
Disclosure of net defined benefit liability (asset) [Line Items]
Pension benefits	₩ 2,013,167

Defined Contribution Plan - Add

Defined Contribution Plan - Additional Information (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Classes of employee benefits expense [abstract]
Defined Contribution plan recognized expenses	₩ 85,174	₩ 72,576	₩ 71,068

Commitments and Contingencies -

Commitments and Contingencies - Summary of Major Commitments with Local Financial Institutions (Detail) - Dec. 31, 2023 € in Thousands, ¥ in Thousands, $ in Thousands, ₩ in Millions	KRW (₩)	USD ($)	EUR (€)	JPY (¥)
Disclosure of detailed information about borrowings [line items]
Limit	₩ 3,497,090	$ 2,046,509,000	€ 7,700,000	¥ 400,000,000
Used amount	619,543	2,046,509,000	7,700,000	400,000,000
Bank overdraft [member] | Kookmin Bank and others [member]
Disclosure of detailed information about borrowings [line items]
Limit	374,000
Used amount	0
Inter-Korean Cooperation Fund [member] | Export-Import Bank of Korea [member]
Disclosure of detailed information about borrowings [line items]
Limit	37,700
Used amount	1,480
Economic Cooperation Business Insurance [member] | Export-Import Bank of Korea [member]
Disclosure of detailed information about borrowings [line items]
Limit	3,240
Used amount	1,732
Collateralised loans on electronic receivable-trade [member] | Kookmin Bank and others [member]
Disclosure of detailed information about borrowings [line items]
Limit	545,350
Used amount	42,822
Plus electronic notes payable [member] | Industrial Bank of Korea [member]
Disclosure of detailed information about borrowings [line items]
Limit	50,000
Used amount	885
Working capital loan [member] | Korea Development Bank and others [member]
Disclosure of detailed information about borrowings [line items]
Limit	1,562,800
Used amount	142,700
Working capital loan [member] | Shinhan Bank [member]
Disclosure of detailed information about borrowings [line items]
Limit | $		76,509
Used amount | $		76,509
Working capital loan [member] | Woori Bank [Member]
Disclosure of detailed information about borrowings [line items]
Limit | €			7,700
Used amount | €			€ 7,700
Facility loans [member] | Shinhan Bank and others [member]
Disclosure of detailed information about borrowings [line items]
Limit	924,000
Used amount	₩ 429,924
Derivatives transaction limit [member] | Korea Development Bank and others [member]
Disclosure of detailed information about borrowings [line items]
Limit | $		1,970,000
Used amount | $		$ 1,970,000
Citi Bank [Member]
Disclosure of detailed information about borrowings [line items]
Limit | ¥				400,000
Used amount | ¥				¥ 400,000

Commitments and Contingencies_2

Commitments and Contingencies - Summary of Guarantees Received from Financial Institutions (Detail) - Dec. 31, 2023 ₫ in Thousands, $ in Thousands, ₩ in Millions	KRW (₩)	USD ($)	VND (₫)
Disclosure of detailed information about borrowings [line items]
Guarantees limit	₩ 2,749,522	$ 122,689	₫ 211,262
Guarantee for payment in korean currency [member] | Hana Bank [Member]
Disclosure of detailed information about borrowings [line items]
Guarantees limit	4,000
Guarantee for payment in korean currency [member] | Woori Bank [Member]
Disclosure of detailed information about borrowings [line items]
Guarantees limit	5,200
Comprehensive Credit Line and Others [Member] | Hana Bank [Member]
Disclosure of detailed information about borrowings [line items]
Guarantees limit	3,100	10,300
Guarantee for payment in foreign currency [member] | Hana Bank [Member]
Disclosure of detailed information about borrowings [line items]
Guarantees limit | $		59
Guarantee for payment in foreign currency [member] | Kookmin Bank [member]
Disclosure of detailed information about borrowings [line items]
Guarantees limit | $		3,186
Guarantee for payment in foreign currency [member] | Woori Bank [Member]
Disclosure of detailed information about borrowings [line items]
Guarantees limit | $		7,000
Guarantee for payment in korean currency and others [Member] | Shinhan Bank [member]
Disclosure of detailed information about borrowings [line items]
Guarantees limit | $		94,517
Guarantee For Payment In Foreign Currency And Others [Member] | Shinhan Bank [member]
Disclosure of detailed information about borrowings [line items]
Guarantees limit | ₫			₫ 211,262
Refund guarantee for advances received [Member] | Korea Development Bank [member]
Disclosure of detailed information about borrowings [line items]
Guarantees limit | $		6,811
Guarantees for depositions [Member] | H S B C [Member]
Disclosure of detailed information about borrowings [line items]
Guarantees limit | $		$ 816
Performance guarantee and others [Member] | Seoul Guarantee Insurance Company [Member]
Disclosure of detailed information about borrowings [line items]
Guarantees limit	366,395
Performance guarantee and others [Member] | Korea Software Financial Cooperative [member]
Disclosure of detailed information about borrowings [line items]
Guarantees limit	1,556,979
Performance guarantee and others [Member] | Korea Specialty Contractor Financial Cooperative [Member]
Disclosure of detailed information about borrowings [line items]
Guarantees limit	135
Performance guarantee and others [Member] | Korea Housing Finance Corporation [Member]
Disclosure of detailed information about borrowings [line items]
Guarantees limit	44,000
Performance guarantee and others [Member] | Korea Housing Urban Guarantee Corporation [member]
Disclosure of detailed information about borrowings [line items]
Guarantees limit	691,530
Performance guarantee and others [Member] | Information Communication Financial Cooperative [Member]
Disclosure of detailed information about borrowings [line items]
Guarantees limit	₩ 78,183

Commitments and Contingencies_3

Commitments and Contingencies - Summary of Guarantees Received from Financial Institutions (Parenthetical) (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure of detailed information about borrowings [line items]
Inventory Assets	₩ 988,351	₩ 717,673
Investment properties	2,198,135	₩ 1,933,358	₩ 1,720,654
Collateral [Member]
Disclosure of detailed information about borrowings [line items]
Inventory Assets	278,031
Investment properties	₩ 283,688

Commitments and Contingencies_4

Commitments and Contingencies - Summary of Guarantees Provided by the Group for Third Parties (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Disclosure of detailed information about borrowings [line items]
Used amount	₩ 10,218,165	₩ 10,006,685
KT Estate Inc. [member] | Hana Bank [Member] | Guarantees [member]
Disclosure of detailed information about borrowings [line items]
Subject to payment guarantees	Wonju Bando U-bora Mark Bridge Buyer
Limit	₩ 103,000
Used amount	₩ 55,314
KT Engineering Co Ltd [Member] | Shinhan Bank [member] | Guarantees [member]
Disclosure of detailed information about borrowings [line items]
Subject to payment guarantees	Gasan Solar Power Plant Inc.
Limit	₩ 4,700
Used amount	₩ 364
KT Engineering Co Ltd [Member] | Suhyup Bank [Member] | Guarantees [member]
Disclosure of detailed information about borrowings [line items]
Subject to payment guarantees	Korea Cell Inc.
Limit	₩ 3,250
Used amount	₩ 50
KT Engineering Co Ltd [Member] | Suhyup Bank One [Member] | Guarantees [member]
Disclosure of detailed information about borrowings [line items]
Subject to payment guarantees	San-Ya Agricultural Association Corporation
Limit	₩ 3,250
Used amount	₩ 51
KT Alpha Co Ltd [Member] | T-commerce cash payers [Member] | Guarantees [member]
Disclosure of detailed information about borrowings [line items]
Subject to payment guarantees	Cash payers
Limit	₩ 821
Used amount	₩ 0
Nasmedia, Co., Ltd. [Member] | Korea Securities Finance Corp [Member] | Guarantees [member]
Disclosure of detailed information about borrowings [line items]
Subject to payment guarantees	Stockholders Association Members
Limit	₩ 1,104
Used amount	₩ 610
Bottom of range [member] | KT Estate Inc. [member] | Hana Bank [Member] | Guarantees [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Aug. 5, 2022
Bottom of range [member] | KT Engineering Co Ltd [Member] | Shinhan Bank [member] | Guarantees [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jan. 7, 2010
Bottom of range [member] | KT Engineering Co Ltd [Member] | Suhyup Bank [Member] | Guarantees [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Feb. 17, 2014
Bottom of range [member] | KT Engineering Co Ltd [Member] | Suhyup Bank One [Member] | Guarantees [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Feb. 17, 2014
Bottom of range [member] | KT Alpha Co Ltd [Member] | T-commerce cash payers [Member] | Guarantees [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Apr. 14, 2023
Top of range [member] | KT Estate Inc. [member] | Hana Bank [Member] | Guarantees [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Feb. 28, 2025
Top of range [member] | KT Engineering Co Ltd [Member] | Shinhan Bank [member] | Guarantees [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jan. 8, 2025
Top of range [member] | KT Engineering Co Ltd [Member] | Suhyup Bank [Member] | Guarantees [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Feb. 16, 2024
Top of range [member] | KT Engineering Co Ltd [Member] | Suhyup Bank One [Member] | Guarantees [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Feb. 16, 2024
Top of range [member] | KT Alpha Co Ltd [Member] | T-commerce cash payers [Member] | Guarantees [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Apr. 12, 2024

Commitments and Contingencies_5

Commitments and Contingencies - Additional Information (Detail) $ in Thousands, ₩ in Millions	12 Months Ended
	Dec. 31, 2023 KRW (₩) EUR (€)	Dec. 31, 2023 USD ($) EUR (€)	Dec. 31, 2022 KRW (₩)
Commitments and Contingencies [Line Items]
Severally liable for reimbursement	₩ 595
Number of lawsuits | €	177	177
Litigation settlement claim amount	₩ 167,834		₩ 80,279
Litigation provision	₩ 29,707
New town development consortium percentage of ownership interest	2.50%	2.50%
Contract amount not yet recognized as liabilities	₩ 489,231		₩ 1,294,823
Additional cumulative investment amount	4,132	$ 30,350
Estimated financial effect of contingent liabilities	₩ 438,312
Percentage of estimated financial effect of contingent liabilities	100%
K Defense Co.Ltd [member]
Commitments and Contingencies [Line Items]
Estimated financial effect of contingent liabilities	₩ 302,423
Percentage of estimated financial effect of contingent liabilities	60%
Joint operations [member]
Commitments and Contingencies [Line Items]
Estimated financial effect of contingent liabilities	₩ 201,615
Percentage of estimated financial effect of contingent liabilities	40%

Leases - Summary of balance she

Leases - Summary of balance sheet information about leases for lessee (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2023	Dec. 31, 2022
Disclosure of balance sheet information about leases for lessee [Line Items]
Right-of-use assets	₩ 1,304,963	₩ 1,280,334
Lease liabilities
Lease liability recognized	1,179,909	1,172,038
Previously stated [member]
Lease liabilities
Current	307,868	315,892
Non-Current	872,042	856,146
Lease liability recognized	1,179,910	1,172,038
Property and building [member] | Previously stated [member]
Disclosure of balance sheet information about leases for lessee [Line Items]
Right-of-use assets	1,019,537	1,081,067
Machinery and communication line facilities [member] | Previously stated [member]
Disclosure of balance sheet information about leases for lessee [Line Items]
Right-of-use assets	89,150	50,794
Other [member] | Previously stated [member]
Disclosure of balance sheet information about leases for lessee [Line Items]
Right-of-use assets	₩ 196,276	₩ 148,473

Leases - Summary of statement o

Leases - Summary of statement of profit or loss information about leases for lessee (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure of statement of profit or loss information about leases for lessee [Line Items]
Depreciation of Right-of-use assets	₩ 402,737	₩ 396,214	₩ 398,716
Depreciation of Investment Properties	0	15	1,794
Interest expense relating to lease liabilities	52,035	41,469	36,651
Expense relating to short-term leases	8,804	12,876	7,984
Expense relating to leases of low-value assets that are not short-term leases	26,290	26,813	26,033
Expense relating to variable lease payments not included in lease liabilities	9,288	4,827	8,400
Property and building [member]
Disclosure of statement of profit or loss information about leases for lessee [Line Items]
Depreciation of Right-of-use assets	297,571	305,120	303,984
Machinery and communication line facilities [member]
Disclosure of statement of profit or loss information about leases for lessee [Line Items]
Depreciation of Right-of-use assets	32,794	31,140	41,794
Other [member]
Disclosure of statement of profit or loss information about leases for lessee [Line Items]
Depreciation of Right-of-use assets	₩ 72,372	₩ 59,954	₩ 52,938

Leases - Additional Information

Leases - Additional Information (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure Of Arrangement Involving Legal Form Of Lease [Abstract]
Cash outflow for leases	₩ 500,392	₩ 464,337	₩ 468,360
Increase decrease in right of use assets	₩ 440,552	₩ 405,453

Share Capital - Summary of Shar

Share Capital - Summary of Share Capital (Detail) ₩ in Millions	Dec. 31, 2023 KRW (₩) shares	Dec. 31, 2023 $ / shares	Dec. 31, 2022 KRW (₩) shares	Dec. 31, 2022 $ / shares
Disclosure of classes of share capital [Line Items]
Ordinary Shares	₩ 1,564,499		₩ 1,564,499
Ordinary shares [member]
Disclosure of classes of share capital [Line Items]
Number of issued shares | shares	257,860,760		261,111,808
Par value per share | $ / shares		$ 5,000		$ 5,000
Ordinary Shares	₩ 1,564,499		₩ 1,564,499

Share Capital - Summary of Sh_2

Share Capital - Summary of Share Capital (Parenthetical) (Detail) - shares	Dec. 31, 2023	Dec. 31, 2022
Disclosure of classes of share capital [abstract]
Treasury shares	55,039,007	55,039,007

Retained Earnings - Summary of

Retained Earnings - Summary of Retained Earnings (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2023	Dec. 31, 2022
Miscellaneous equity [abstract]
Legal reserve	₩ 782,249	₩ 782,249
Voluntary reserves	4,651,362	4,651,362
Unappropriated retained earnings	9,042,256	8,821,705
Total	₩ 14,475,867	₩ 14,255,316

Retained Earnings - Summary o_2

Retained Earnings - Summary of Retained Earnings (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Miscellaneous equity [abstract]
Minimum percentage of cash dividend declared appropriation to legal reserve	10%	10%
Percentage of legal reserve equal to capital stock issued	50%	50%

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income and Other Components of Equity - Summary of Accumulated Other Comprehensive Income (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Total accumulated other comprehensive income	₩ 52,407	₩ (77,776)	₩ 117,469
Changes in investments in associates and joint ventures [member]
Total accumulated other comprehensive income	4,023	(11,752)	(3,461)
Gain (loss) on derivatives valuation [member]
Total accumulated other comprehensive income	(29,361)	(7,109)	25,031
Gain (loss) on valuation of financial assets at fair value through other comprehensive income [member]
Total accumulated other comprehensive income	73,928	(52,100)	108,685
Exchange differences on translation for foreign operations [member]
Total accumulated other comprehensive income	₩ 3,817	₩ (6,815)	₩ (12,786)

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Income and Other Components of Equity - Summary of Changes in Accumulated Other Comprehensive Income (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Beginning	₩ (77,776)	₩ 117,469
Increase /decrease	168,125	(99,824)
Reclassified to gain or loss	(37,942)	(95,421)
Ending	52,407	(77,776)
Changes in investments in associates and joint ventures [member]
Beginning	(11,752)	(3,461)
Increase /decrease	15,775	(8,291)
Ending	4,023	(11,752)
Gain (loss) on derivatives valuation [member]
Beginning	(7,109)	25,031
Increase /decrease	15,690	63,281
Reclassified to gain or loss	(37,942)	(95,421)
Ending	(29,361)	(7,109)
Gain (loss) on valuation of financial assets at fair value through other comprehensive income [member]
Beginning	(52,100)	108,685
Increase /decrease	126,028	(160,785)
Ending	73,928	(52,100)
Exchange differences on translation for foreign operations [member]
Beginning	(6,815)	(12,786)
Increase /decrease	10,632	5,971
Ending	₩ 3,817	₩ (6,815)

Accumulated Other Comprehensi_5

Accumulated Other Comprehensive Income and Other Components of Equity - Summary of Other Components of Equity (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Miscellaneous equity [abstract]
Treasury stock	₩ (398,075)	₩ (202,295)
Gain or loss on disposal of treasury stock	3,220	(41,503)
Share-based payments	8,773	6,222
Others	(416,336)	(334,576)
Total	₩ (802,418)	₩ (572,152)

Accumulated Other Comprehensi_6

Accumulated Other Comprehensive Income and Other Components of Equity - Summary of Other Components of Equity (Parenthetical) (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Miscellaneous equity [abstract]
Treasury shares, Amount directly reflected in equity	₩ 101	₩ 14,886

Accumulated Other Comprehensi_7

Accumulated Other Comprehensive Income and Other Components of Equity - Summary of Treasury Stock (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2023	Dec. 31, 2022
Miscellaneous equity [abstract]
Number of shares (in shares)	11,447,338	5,069,130
Amounts (in millions of Korean won)	₩ 398,075	₩ 202,295

Share-based Payments - Summary

Share-based Payments - Summary of Details of Share-based Payments (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
16th grant [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Fair value per option		₩ 36,941
Total compensation costs		₩ 9,442
17th grant [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Fair value per option	₩ 30,205
Total compensation costs	₩ 7,262

Share-based Payments - Summar_2

Share-based Payments - Summary of Changes in the Number of Stock Options and the Weighted-Average Exercise Price (Detail)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Disclosure of terms and conditions of share-based payment arrangement [Line Items]
Beginning	258,509	284,209
Grant	307,182	258,509
Expired	(105,859)	(155,286)
Exercised	(131,690)	(128,923)
Ending	328,142	258,509
15th grant [member]
Disclosure of terms and conditions of share-based payment arrangement [Line Items]
Beginning	0	284,209
Grant		0
Expired		(155,286)
Exercised		(128,923)
Ending		0
16th grant [member]
Disclosure of terms and conditions of share-based payment arrangement [Line Items]
Beginning	258,509
Grant	0	258,509
Expired	(105,859)
Exercised	(131,690)
Ending	20,960	258,509
17th grant [member]
Disclosure of terms and conditions of share-based payment arrangement [Line Items]
Grant	307,182
Ending	307,182

Share-based Payments - Summar_3

Share-based Payments - Summary of Changes in the Number of Stock Options and the Weighted-Average Exercise Price (Parenthetical) (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Disclosure of terms and conditions of share-based payment arrangement [abstract]
Weighted average exercise price of share options exercised	$ 29,550	$ 35,450

Revenue from Contracts with C_3

Revenue from Contracts with Customers, Other Income and Relevant Contract Assets and Liabilities - Detail Explanation of Revenue And Other Income in the consolidated Statement of operations (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure of disaggregation of revenue from contracts with customers [abstract]
Revenue from contracts with customers	₩ 26,063,185	₩ 25,432,727	₩ 24,712,128
Revenue from other sources	224,016	206,128	185,877
Other income (Note 26)	308,044	595,351	307,654
Operating revenue and other Income	₩ 26,595,245	₩ 26,234,206	₩ 25,205,659

Revenue from Contracts with C_4

Revenue from Contracts with Customers, Other Income and Relevant Contract Assets and Liabilities - Detail Explanation of Operating Revenues And Other Income (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure of disaggregation of revenue from contracts with customers [abstract]
Mobile services	₩ 7,140,333	₩ 7,013,889	₩ 6,936,485
Fixed-line services	5,142,359	5,056,513	4,960,338
Fixed-line and VoIP telephone services	1,249,024	1,378,265	1,465,059
Broadband Internet access services	2,578,558	2,504,833	2,343,591
Data communication services	1,314,777	1,173,415	1,151,689
Media and content	3,206,521	3,099,776	2,800,630
Financial services	3,967,763	3,836,589	3,661,896
Sale of goods	3,292,514	3,393,646	3,532,973
Others	3,845,755	3,833,793	3,313,337
Total	₩ 26,595,245	₩ 26,234,206	₩ 25,205,659

Revenue from Contracts with C_5

Revenue from Contracts with Customers, Other Income and Relevant Contract Assets and Liabilities - Detail Analysis of Contract with Customer Assets and Liabilities (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2023	Dec. 31, 2022
Disclosure of revenue from contracts with customers [line items]
Contract assets	₩ 832,520	₩ 802,253
Contract liabilities	278,749	284,107
Deferred revenue	27,392	46,493
Revenue from contracts with customers [member]
Disclosure of revenue from contracts with customers [line items]
Contract assets	1,130,745	963,133
Contract liabilities	311,023	344,869
Deferred revenue	₩ 81,067	₩ 81,653

Revenue from Contracts with C_6

Revenue from Contracts with Customers, Other Income and Relevant Contract Assets and Liabilities - Detail Analysis of Contract with Customer Assets and Liabilities (Parenthetical) (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2023	Dec. 31, 2022
Disclosure of revenue from contracts with customers [line items]
Contract assets	₩ 832,520	₩ 802,253
Contract liabilities	278,749	284,107
long term construction contract [Member]
Disclosure of revenue from contracts with customers [line items]
Contract assets	308,821	160,880
Contract liabilities	₩ 32,274	₩ 60,762

Revenue from Contracts with C_7

Revenue from Contracts with Customers, Other Income and Relevant Contract Assets and Liabilities - Detail Analysis of Contract Costs Recognized as Assets (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Incremental cost of contract establishment [Member]
Statement [Line Items]
Incremental cost of contract establishment	₩ 1,656,711	₩ 1,744,096	₩ 1,726,401
Cost of Contract performance [Member]
Statement [Line Items]
Incremental cost of contract establishment	₩ 70,757	₩ 73,582	₩ 74,843

Revenue from Contracts with C_8

Revenue from Contracts with Customers, Other Income and Relevant Contract Assets and Liabilities - Additional Information (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure of disaggregation of revenue from contracts with customers [abstract]
Operating expenses	₩ 1,759,586	₩ 1,793,013	₩ 1,842,621

Revenue from Contracts with C_9

Revenue from Contracts with Customers, Other Income and Relevant Contract Assets and Liabilities - Detail of Revenue Arising from Carried-Forward Contract Liabilities (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure of disaggregation of revenue from contracts with customers [abstract]
Allocation of the transaction price	₩ 213,609	₩ 246,843	₩ 275,965
Deferred revenue of joining/installment fee	41,824	44,204	42,100
Total	₩ 255,433	₩ 291,047	₩ 318,065

Other Income - Summary Of Other

Other Income - Summary Of Other Income (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Text block [abstract]
Gains on disposal of property and equipment and investment properties	₩ 22,447	₩ 52,603	₩ 54,007
Gains on disposal of intangible assets	1,727	622	1,726
Gain on disposal of right-of-use assets	3,580	3,326	3,138
Property and Equipment loss recovery income	152,712	159,849	148,927
Gains on government subsidies	40,725	44,473	43,822
Income from government subsidies	6,982	38,319	5
Gain on disposal of investments in subsidiaries	28,825	216,591	244
Others	51,046	79,568	55,785
Total	₩ 308,044	₩ 595,351	₩ 307,654

Operating Expenses - Summary of

Operating Expenses - Summary of Operating Expenses (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Profit (loss) [abstract]
Employee benefit cost	₩ 4,556,832	₩ 4,495,885	₩ 4,215,810
Depreciation	2,723,610	2,637,463	2,605,594
Depreciation of right-of-use assets	402,737	396,214	398,716
Amortization of intangible assets	683,784	622,202	603,327
Commissions	1,264,729	1,295,434	1,125,944
Interconnection charges	436,598	479,500	507,567
International interconnection fee	140,433	186,253	192,008
Purchase of inventories	3,595,345	3,656,040	3,753,792
Changes of inventories	(203,071)	(195,046)	20,491
Sales commission	2,353,318	2,353,909	2,343,375
Service cost	2,229,709	2,334,386	2,296,324
Utilities	544,675	368,348	364,373
Taxes and dues	250,651	276,962	268,651
Rent	167,576	160,848	123,246
Insurance premium	66,737	68,245	66,717
Installation fee	174,238	150,140	154,542
Advertising expenses	153,750	195,519	171,400
Allowance for bad debts	150,549	115,358	82,329
Card service cost	3,189,376	3,127,673	3,114,047
Loss on disposal of property and equipment	72,710	81,415	71,417
Loss on disposal of intangible assets	5,328	7,015	3,885
Loss on disposal of right-of-use assets	2,115	2,348	11,457
Loss on disposal of investments in subsidiaries	0	0	13,727
Impairment loss on property and equipment	7,871	16,094	2,115
Impairment loss on intangible assets	236,206	30,965	3,747
Donations	24,664	15,642	10,981
Other allowance for bad debts	34,112	17,551	28,066
Others	1,902,214	1,369,686	952,614
Total	₩ 25,166,796	₩ 24,266,049	₩ 23,506,262

Operating Expenses - Summary _2

Operating Expenses - Summary of Details of Employee Benefits (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Profit (loss) [abstract]
Salaries & Wages	₩ 4,231,781	₩ 4,161,874	₩ 3,837,359
Post-employment benefits (Defined benefit plan)	183,026	225,404	236,831
Post-employment benefits (Defined contribution plan)	85,174	72,576	71,068
Share-based payment	15,450	16,799	47,415
Others	41,401	19,232	23,137
Total	₩ 4,556,832	₩ 4,495,885	₩ 4,215,810

Financial Income and Costs - Su

Financial Income and Costs - Summary of Details of Financial Income (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure Of Finance Income [line items]
Interest income	₩ 279,607	₩ 271,925	₩ 273,460
Gain on foreign currency transactions	27,407	67,976	19,976
Gain on foreign currency translation	11,944	43,092	32,768
Gain on derivative transactions	12,304	50,668	2,215
Gain on valuation of derivatives	49,881	182,998	255,149
Gain on valuation of financial instruments	32,477	31,032	90,653
Others	69,216	42,737	52,062
Total	486,277	₩ 690,428	₩ 726,283
Loans and receivables [member]
Disclosure Of Finance Income [line items]
Gain on disposal of trade receivables	₩ 3,441

Financial Income and Costs - _2

Financial Income and Costs - Summary of Details of Financial Expense (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure Of Finance Income [line items]
Interest expenses	₩ 356,345	₩ 293,854	₩ 263,389
Loss on foreign currency transactions	34,281	81,171	13,105
Loss on foreign currency translation	95,730	200,109	213,689
Loss on derivative transactions	417	24,331	6,287
Loss on valuation of derivatives	6,598	21,601	15,947
Loss on valuation of financial instruments	55,049	65,660	25,994
Others	2,282	485	2,207
Total	568,682	749,908	563,330
Loans and receivables [member]
Disclosure Of Finance Income [line items]
Loss on disposal of trade receivables	₩ 17,980	₩ 62,697	₩ 22,712

Deferred Income Tax and Incom_3

Deferred Income Tax and Income Tax Expense - Summary of Analysis of Deferred Tax Assets and Deferred Tax Liabilities (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2023	Dec. 31, 2022
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Deferred income tax assets	₩ 614,500	₩ 579,090
Deferred income tax liabilities	(994,330)	(967,650)
Gross carrying amount [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Deferred income tax assets	2,228,333	2,306,400
Deferred income tax liabilities	(2,608,163)	(2,694,960)
Gross carrying amount [member] | Less than 1 year [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Deferred income tax assets	404,234	398,710
Deferred income tax liabilities	(491,817)	(586,522)
Gross carrying amount [member] | Over 12 months [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Deferred income tax assets	1,824,099	1,907,690
Deferred income tax liabilities	₩ (2,116,346)	₩ (2,108,438)

Deferred Income Tax and Incom_4

Deferred Income Tax and Income Tax Expense - Summary of Movement in Deferred Income Tax Assets and Liabilities (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	₩ (388,560)	₩ (220,230)
Statements of profit or loss	16,827	(169,961)	₩ (229,545)
Other comprehensive income	(8,097)	1,631
Ending	(379,830)	(388,560)	(220,230)
Deferred tax liabilities investment in subsidiaries associates and joint ventures [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	(255,184)	(240,633)
Statements of profit or loss	(7,821)	(18,299)
Other comprehensive income	(7,225)	3,748
Ending	(270,230)	(255,184)	(240,633)
Deferred tax liabilities depreciation and impairment loss [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	(151,433)	(88,588)
Statements of profit or loss	39,309	(62,845)
Ending	(112,124)	(151,433)	(88,588)
Deferred tax liabilities plan assets [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	(542,900)	(538,928)
Statements of profit or loss	8,367	(5,294)
Other comprehensive income	826	1,322
Ending	(533,707)	(542,900)	(538,928)
Deferred tax liabilities advanced depreciation provision [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	(521,939)	(339,005)
Statements of profit or loss	3,859	(182,934)
Ending	(518,080)	(521,939)	(339,005)
Deferred tax liabilities contract assets [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	(424,302)	(493,917)
Statements of profit or loss	2,478	69,615
Ending	(421,824)	(424,302)	(493,917)
Deferred tax liabilities financial assets at fair value through profit or loss [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	(420)	(336)
Statements of profit or loss	461	(73)
Other comprehensive income	43	(11)
Ending	84	(420)	(336)
Deferred tax liabilities Financial assets at fair value through other comprehensive income [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	(60,629)	(47,521)
Statements of profit or loss	(53)	(71,396)
Other comprehensive income	(41,945)	58,288
Ending	(102,627)	(60,629)	(47,521)
Other deferred tax liabilities [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	(738,153)	(623,744)
Statements of profit or loss	90,876	(111,135)
Other comprehensive income	(2,378)	(3,274)
Ending	(649,655)	(738,153)	(623,744)
Deferred tax liabilities [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	(2,694,960)	(2,372,672)
Statements of profit or loss	137,476	(382,361)
Other comprehensive income	(50,679)	60,073
Ending	(2,608,163)	(2,694,960)	(2,372,672)
Deferred tax assets depreciation and impairment loss [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	188,832	225,821
Statements of profit or loss	(71,689)	(36,989)
Other comprehensive income	(397)
Ending	116,746	188,832	225,821
Deferred tax assets contract liabilities [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	121,289	148,454
Statements of profit or loss	(9,311)	(27,165)
Ending	111,978	121,289	148,454
Deferred tax assets defined benefit liabilities [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	481,858	571,336
Statements of profit or loss	(6,705)	(22,423)
Other comprehensive income	40,838	(67,055)
Ending	515,991	481,858	571,336
Deferred tax assets provisions [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	151,955	172,871
Statements of profit or loss	(5,784)	(20,894)
Other comprehensive income	0	(22)
Ending	146,171	151,955	172,871
Other deferred tax assets [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	1,259,495	899,543
Statements of profit or loss	(53,459)	351,317
Other comprehensive income	2,141	8,635
Ending	1,208,177	1,259,495	899,543
Deferred tax assets [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	2,203,429	2,018,025
Statements of profit or loss	(146,948)	243,846
Other comprehensive income	42,582	(58,442)
Ending	2,099,063	2,203,429	2,018,025
Temporary differences [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	(491,531)	(354,647)
Statements of profit or loss	(9,472)	(138,515)
Other comprehensive income	(8,097)	1,631
Ending	(509,100)	(491,531)	(354,647)
Deferred tax assets tax credit carry forwards [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	102,971	134,417
Statements of profit or loss	26,299	(31,446)
Ending	₩ 129,270	₩ 102,971	₩ 134,417

Deferred Income Tax and Incom_5

Deferred Income Tax and Income Tax Expense - Summary of Tax Impacts Recognized Directly To Equity (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Deferred tax assets and liabilities [abstract]
Gain (loss) on valuation of financial assets at fair value through other comprehensive income, Before recognition	₩ 163,750	₩ (216,862)	₩ 163,892
Gain (loss) on valuation of hedge instruments (loss) liabilities, Before recognition	(30,168)	(42,510)	6,916
Remeasurements of net defined benefit liabilities, Before recognition	(179,129)	247,162	74,518
Share of Gain (loss) of associates and joint ventures, and others, Before recognition	28,715	(14,931)	(34,909)
Exchange differences on translation for foreign operations, Before recognition	32,376	23,316	683
Gain or loss on disposal of treasury stock, Before recognition	402	(59,308)	(15,657)
Total, Before recognition	15,946	(63,133)	195,443
Gain (loss) on valuation of financial assets at fair value through other comprehensive income, Tax effect	(41,945)	58,288	(34,112)
Gain (loss) on valuation of hedge instruments (loss) liabilities, Tax effect	7,555	11,180	(1,644)
Remeasurements of net defined benefit liabilities, Tax effect	41,664	(65,733)	(18,696)
Share of Gain (loss) of associates and joint ventures, and others, Tax effect	(7,225)	3,748	9,097
Exchange differences on translation for foreign operations, Tax effect	(8,146)	(5,852)	(178)
Gain or loss on disposal of treasury stock, Tax effect	(101)	14,886	4,080
Total, Tax effect	(8,198)	16,517	(41,453)
Gain (loss) on valuation of financial assets at fair value through other comprehensive income, After recognition	121,805	(158,574)	129,780
Gain (loss) on valuation of hedge instruments (loss) liabilities, After recognition	(22,613)	(31,330)	5,272
Remeasurements of net defined benefit liabilities, After recognition	(137,465)	181,429	55,822
Share of Gain (loss) of associates and joint ventures, and others, After recognition	21,490	(11,183)	(25,812)
Exchange differences on translation for foreign operations, After recognition	24,230	17,464	505
Gain or loss on disposal of treasury stock, After recognition	301	(44,422)	(11,577)
Total other comprehensive income	₩ 7,748	₩ (46,616)	₩ 153,990

Deferred Income Tax and Incom_6

Deferred Income Tax and Income Tax Expense - Summary of Details of Income Tax Expense (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Deferred tax assets and liabilities [abstract]
Current income tax expense	₩ 347,265	₩ 335,796	₩ 289,471
Impact of change in deferred taxes	(16,827)	169,961	229,545
Income tax expense	₩ 330,438	₩ 505,757	₩ 519,016

Deferred Income Tax and Incom_7

Deferred Income Tax and Income Tax Expense - Summary of Tax on the Group's Profit Before Tax (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Deferred tax assets and liabilities [abstract]
Profit before income tax expense	₩ 1,302,620	₩ 1,891,392	₩ 1,978,411
Statutory income tax expense	333,530	509,771	533,701
Tax effect
Income not taxable for taxation purposes	(30,106)	(47,550)	(4,307)
Non-deductible expenses	26,723	53,398	20,570
Tax credit	(78,459)	(54,895)	(31,517)
Additional payment of income taxes	(4,991)	11,744	(221)
Adjustments in deferred tax from changes in tax rate	564	(41,545)
Tax effect and adjustment on consolidation
Goodwill impairment	106,010	5,809
Eliminated dividend income form subsidiaries			7,264
Changes of out-side tax effect	4,436	29,922	4,738
Intangible Asset impairment and amortization	5,892	5,276	796
Reversal expenses of contract cost assets	9,281	(4,800)	(2,932)
Acquisition and disposition of businesses	5,564	(8,587)	(5,128)
Others	(42,442)	38,627	(3,948)
Income tax expense	₩ 330,438	₩ 505,757	₩ 519,016

Deferred Income Tax and Incom_8

Deferred Income Tax and Income Tax Expense - Summary of deferred tax assets and liabilities that are not recognized (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2023	Dec. 31, 2022
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deductible temporary differences for which no deferred tax asset is recognised	₩ 4,162,949	₩ 3,876,693
Taxable Temporary Differences For Which No Deferred Tax Asset and Liabilities Is Recognised	1,114,595	1,073,736
Investment in subsidiaries, associates, and joint ventures [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deductible temporary differences for which no deferred tax asset is recognised	3,520,173	3,384,295
Taxable Temporary Differences For Which No Deferred Tax Asset and Liabilities Is Recognised	903,394	857,076
Unused tax loss [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deductible temporary differences for which no deferred tax asset is recognised	203,200	103,326
Unused Tax credit [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deductible temporary differences for which no deferred tax asset is recognised	2,338	1,988
Others [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deductible temporary differences for which no deferred tax asset is recognised	437,238	387,084
Others [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Taxable Temporary Differences For Which No Deferred Tax Asset and Liabilities Is Recognised	₩ 211,201	₩ 216,660

Deferred Income Tax and Incom_9

Deferred Income Tax and Income Tax Expense - Summary of expected period of expiry for unused tax losses not recognized in deferred tax assets (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2023	Dec. 31, 2022
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax losses for which no deferred tax asset recognised	₩ 203,200	₩ 103,326
2023 [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax losses for which no deferred tax asset recognised	4,484	72,512
2024 [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax losses for which no deferred tax asset recognised	2,836	5,011
2025 [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax losses for which no deferred tax asset recognised	2,086	3,701
2026 [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax losses for which no deferred tax asset recognised	4,541	2,112
2027 [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax losses for which no deferred tax asset recognised	2,473	2,534
2028 [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax losses for which no deferred tax asset recognised	6,533	396
2029 [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax losses for which no deferred tax asset recognised	743	617
2030 [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax losses for which no deferred tax asset recognised	713	2,198
2031 [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax losses for which no deferred tax asset recognised	756	1,360
2032 [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax losses for which no deferred tax asset recognised	0	7,450
After 2033 [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax losses for which no deferred tax asset recognised	₩ 178,035	₩ 5,435

Earnings per Share - Summary of

Earnings per Share - Summary of Basic and Diluted Earnings per Share from Operations (Detail) - KRW (₩) ₩ / shares in Units, ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Basic earnings per share [abstract]
Profit attributable to ordinary shares of owners of the Controlling Company (in millions of Korean won)	₩ 993,325	₩ 1,259,686	₩ 1,354,537
Weighted average number of ordinary shares outstanding (in number of shares)	249,470,072	242,235,332	235,201,782
Basic earnings per share (In Korean won)	₩ 3,982	₩ 5,200	₩ 5,759
Profit attributable to ordinary shares of owners of the Controlling Company (In millions of Korean won)	₩ 993,325	₩ 1,259,686	₩ 1,354,537
Adjustment to net income attributable to ordinary shares (in millions of Korean won)	(827)	(496)	0
Diluted profit attributable to ordinary shares (In millions of Korean won)	₩ 992,498	₩ 1,259,190	₩ 1,354,537
Number of dilutive potential ordinary shares outstanding	119,263	91,931	483,760
Weighted average number of ordinary shares outstanding	249,589,335	242,327,263	235,685,542
Diluted earnings per share (In Korean won)	₩ 3,977	₩ 5,196	₩ 5,747

Dividend - Additional Informati

Dividend - Additional Information (Detail) - KRW (₩) ₩ / shares in Units, ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure of Dividends [abstract]
Dividends paid	₩ 501,844	₩ 450,394	₩ 326,487
Dividends paid per share	₩ 1,960	₩ 1,910	₩ 1,350
Dividends declared	₩ 482,970
Dividends declared per share	₩ 1,960

Cash Generated from Operation_2

Cash Generated from Operations - Summary of Cash Flows from Operating Activities (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash flows from (used in) operating activities [abstract]
Profit for the year	₩ 972,182	₩ 1,385,635	₩ 1,459,395
Adjustments to reconcile net income
Income tax expense	335,367	505,757	519,016
Interest income	(392,580)	(340,794)	(300,900)
Interest expense	410,566	320,914	268,847
Dividends income	(59,758)	(14,121)	(21,525)
Depreciation	2,773,152	2,687,191	2,643,894
Amortization of intangible assets	691,909	627,261	604,744
Depreciation of right-of-use assets	402,737	396,214	398,716
Provision for severance benefits (defined benefits)	196,027	240,506	253,491
Impairment losses on trade receivables	175,244	132,102	105,344
Share of net profit or loss of associates and joint ventures	44,323	16,821	(116,061)
Loss(gain) on disposal of associates and joint ventures	(6,982)	(38,024)	1
Loss(gain) on the disposal of subsidiaries	(28,825)	(216,591)	13,483
Loss(gain) on disposal of right-of-use assets	(1,465)	(978)	8,319
Impairment losses on assets held for sale	0	0	11
Impairment loss on property and equipment and investment in properties	7,871	16,094	2,115
Loss(gain) on disposal of property and equipment and investment in properties	511	(66,317)	17,410
Loss on disposal of intangible assets	3,601	6,393	2,159
Loss on impairment of intangible assets	236,106	30,674	3,747
Loss on foreign currency translation	83,899	157,017	180,921
Gain on valuation and settlement of derivatives, net	(37,249)	(205,381)	(235,130)
Gain on disposal of financial assets at fair value through profit or loss	(2,225)	(2,347)	(29,974)
Loss(Gain) on valuation of financial assets at fair value through profit or loss	13,920	44,833	(64,660)
Loss(gain) on disposal of financial assets at amortized cost	1	3	(35)
Others	158,820	(49,891)	84,625
Change in operating assets and liabilities, net of effects from purchase of controlled entity and sale of engineering division
Decrease(increase) in trade receivables	(124,023)	(43,787)	327,031
Increase in other receivables	(1,085,527)	(1,598,216)	(328,610)
Decrease(increase) in other current assets	250,569	(101,947)	(89,230)
Increase in other non-current assets	(86,030)	(120,054)	(143,087)
Decrease(increase) in inventories	(317,531)	(179,255)	32,798
Increase(decrease) in trade payables	121,515	(368,355)	289,044
Increase in other payables	829,220	1,103,113	207,583
Increase(decrease) in other current liabilities	414,436	(30,375)	107,993
Decrease in other non-current liabilities	(14,272)	(1,015)	(14,915)
Decrease in provisions	(5,083)	(22,115)	(4,668)
Increase(decrease) in deferred revenue	905	(384)	3,696
Decrease(increase) in plan assets	115,725	(90,771)	(114,631)
Payment of post-employment benefits	(329,861)	(343,931)	(241,350)
Cash generated from operations (1+2+3)	₩ 5,747,195	₩ 3,835,879	₩ 5,829,607

Cash Generated from Operation_3

Cash Generated from Operations - Summary of Cash Flows from Operating Activities (Parenthetical) (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure Of Cash Flows From Operating Activities [Line Items]
Interest income	₩ 279,607	₩ 271,925	₩ 273,460
Interest expenses	356,345	293,854	263,389
Gain loss valuation Of financial assets	13,920	44,833	(64,660)
BC Card Co Ltd [Member]
Disclosure Of Cash Flows From Operating Activities [Line Items]
Interest income	112,973	68,869	27,440
Interest expenses	55,677	27,060	5,458
Dividend income	1,759	₩ 2,299	₩ 1,340
KT Estate Inc [Member]
Disclosure Of Cash Flows From Operating Activities [Line Items]
Gains (losses) on disposals of investment properties	49,752
KT Investment Co Ltd [Member]
Disclosure Of Cash Flows From Operating Activities [Line Items]
Gain loss valuation Of financial assets	₩ 11,112

Cash Generated from Operation_4

Cash Generated from Operations - Summary of Significant Transactions not Affecting Cash Flows (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash flows from (used in) operating activities [abstract]
Reclassification of the current portion of borrowings	₩ 1,731,998	₩ 1,004,818	₩ 1,303,543
Reclassification of construction-in-progress to property and equipment	3,123,611	3,167,965	2,916,888
Reclassification of accounts payable from property and equipment	(293,448)	(7,055)	(149,512)
Reclassification of accounts payable from intangible assets	(276,491)	(197,389)	524,040
Reclassification of payable from defined benefit liabilities	26,246	(32,417)	69,415
Reclassification of payable from plan assets	₩ (24,821)	28,532	₩ (60,320)
Disposal of treasury stock related to acquisition of financial assets		747,161
Acquisition of financial assets related to disposal of a subsidiary		₩ 250,000

Changes in Liabilities Arisin_3

Changes in Liabilities Arising from Financing Activities - Summary of Changes in Liabilities Arising from Financial Activities (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure of reconciliation of liabilities arising from financing activities [line items]
Beginning	₩ 11,021,448	₩ 9,572,795	₩ 8,582,905
Cash flows	(252,750)	1,047,720	504,331
Newly acquired	460,617	426,644	458,870
Changes in FX rate	88,745	18,805	2,882
Fair value change	13,174	44,221	(22,053)
Acquisition and disposition of businesses	0	0	52,834
Others	(67,824)	(88,737)	(6,974)
Ending	11,263,410	11,021,448	9,572,795
Borrowings [member]
Disclosure of reconciliation of liabilities arising from financing activities [line items]
Beginning	10,006,685	8,437,703	7,316,298
Cash flows	106,118	1,391,321	900,394
Newly acquired	0	0	52,782
Changes in FX rate	45,370	146,108	196,890
Fair value change	1,719	939
Acquisition and disposition of businesses	0	0	15,994
Others	58,273	30,614	(44,655)
Ending	10,218,165	10,006,685	8,437,703
Lease liabilities [member]
Disclosure of reconciliation of liabilities arising from financing activities [line items]
Beginning	1,172,038	1,159,369	1,143,640
Cash flows	(407,051)	(378,684)	(394,567)
Newly acquired	460,617	427,398	403,451
Changes in FX rate	0	0	3
Fair value change	24	0	90
Acquisition and disposition of businesses	0	0	36,840
Others	(45,719)	(36,045)	(30,088)
Ending	1,179,909	1,172,038	1,159,369
Derivative liabilities [member]
Disclosure of reconciliation of liabilities arising from financing activities [line items]
Beginning	33,555	75,176	130,573
Cash flows	0	(41,197)	(1,712)
Newly acquired	0	0	2,637
Changes in FX rate	10,888	19,858	(4,311)
Fair value change	9,643	12,941	(4,892)
Acquisition and disposition of businesses	0	0	0
Others	(29,539)	(33,223)	(47,119)
Ending	24,547	33,555	75,176
Derivative assets [member]
Disclosure of reconciliation of liabilities arising from financing activities [line items]
Beginning	(190,830)	(99,453)	(7,606)
Cash flows	48,183	76,280	216
Newly acquired	0	(754)	0
Changes in FX rate	32,487	(147,161)	(189,700)
Fair value change	1,788	30,341	(17,251)
Acquisition and disposition of businesses	0	0	0
Others	(50,839)	(50,083)	114,888
Ending	₩ (159,211)	₩ (190,830)	₩ (99,453)

Segment Information - Summary o

Segment Information - Summary of Segment Information (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure of operating segments [Line Items]
Operating revenues	₩ 26,595,245	₩ 26,234,206	₩ 25,205,659
Operating income (loss)	1,428,449	1,968,157	1,699,397
Depreciation and Amortization	3,810,131	3,655,879	3,607,638
Operating segments [member]
Disclosure of operating segments [Line Items]
Operating revenues	31,782,093	31,456,833	29,737,242
Operating income (loss)	1,385,818	2,073,417	1,755,230
Depreciation and Amortization	3,928,820	3,852,350	3,712,507
Operating segments [member] | ICT [member]
Disclosure of operating segments [Line Items]
Operating revenues	18,698,964	18,697,269	18,734,342
Operating income (loss)	1,193,333	1,347,405	1,170,920
Depreciation and Amortization	3,183,408	3,105,807	3,217,643
Operating segments [member] | Finance [member]
Disclosure of operating segments [Line Items]
Operating revenues	3,723,286	3,615,307	3,526,743
Operating income (loss)	91,591	119,805	104,511
Depreciation and Amortization	37,150	47,638	46,223
Operating segments [member] | Satellite TV [member]
Disclosure of operating segments [Line Items]
Operating revenues	714,574	709,160	665,081
Operating income (loss)	(70,170)	19,797	61,398
Depreciation and Amortization	52,871	58,413	60,980
Operating segments [member] | Real estate [Member]
Disclosure of operating segments [Line Items]
Operating revenues	499,997	474,954	336,218
Operating income (loss)	73,496	113,134	27,498
Depreciation and Amortization	70,653	65,457	60,459
Operating segments [member] | Others [member]
Disclosure of operating segments [Line Items]
Operating revenues	8,145,272	7,960,143	6,474,858
Operating income (loss)	97,568	473,276	390,903
Depreciation and Amortization	584,738	575,035	327,202
Elimination [member]
Disclosure of operating segments [Line Items]
Operating revenues	(5,186,848)	(5,222,627)	(4,531,583)
Operating income (loss)	42,631	(105,260)	(55,833)
Depreciation and Amortization	₩ (118,689)	₩ (196,471)	₩ (104,869)

Segment Information - Summary_2

Segment Information - Summary of Operating Revenues and Non Current Assets by Geographical Regions (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure of geographical areas [Line Items]
Operating revenues	₩ 26,595,245	₩ 26,234,206	₩ 25,205,659
Non-current assets	20,909,038	21,115,704
Domestic [member]
Disclosure of geographical areas [Line Items]
Operating revenues	26,425,735	26,074,349	25,114,719
Non-current assets	20,725,694	20,845,214
Overseas [member]
Disclosure of geographical areas [Line Items]
Operating revenues	169,510	159,857	₩ 90,940
Non-current assets	₩ 183,344	₩ 270,490

Related Party Transactions - Su

Related Party Transactions - Summary of Related Parties Outstanding Balances of Receivables and Payables (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2023	Dec. 31, 2022
Trade receivables [member]
Disclosure of transactions between related parties [line items]
Receviables	₩ 7,824	₩ 4,572
Trade receivables [member] | K Bank Inc.[Member]
Disclosure of transactions between related parties [line items]
Receviables	862	682
Trade receivables [member] | Little Big Pictures [Member]
Disclosure of transactions between related parties [line items]
Receviables	232	1,454
Trade receivables [member] | K-Realty 11th Real Estate Investment Trust Company [Member]
Disclosure of transactions between related parties [line items]
Receviables	110	151
Trade receivables [member] | KRealty No.3 Real Estate General Private Placement Investment Company [Member]
Disclosure of transactions between related parties [line items]
Receviables	4,576
Trade receivables [member] | Others [member]
Disclosure of transactions between related parties [line items]
Receviables	2,044	2,285
Other Receivables [member]
Disclosure of transactions between related parties [line items]
Receviables	330,924	267,929
Other Receivables [member] | K Bank Inc.[Member]
Disclosure of transactions between related parties [line items]
Receviables	326,006	258,999
Other Receivables [member] | Little Big Pictures [Member]
Disclosure of transactions between related parties [line items]
Receviables	3,473	7,645
Other Receivables [member] | K-Realty 11th Real Estate Investment Trust Company [Member]
Disclosure of transactions between related parties [line items]
Receviables	1,283	1,283
Other Receivables [member] | Others [member]
Disclosure of transactions between related parties [line items]
Receviables	162	2
Lease receivables [member]
Disclosure of transactions between related parties [line items]
Receviables	769
Lease receivables [member] | K Bank Inc.[Member]
Disclosure of transactions between related parties [line items]
Receviables	769
Trade payables [member]
Disclosure of transactions between related parties [line items]
Payables	2,909	3,235
Trade payables [member] | Little Big Pictures [Member]
Disclosure of transactions between related parties [line items]
Payables	9
Trade payables [member] | Others [member]
Disclosure of transactions between related parties [line items]
Payables	2,900	3,235
Other payables [member]
Disclosure of transactions between related parties [line items]
Payables	3,334	3,240
Other payables [member] | K Bank Inc.[Member]
Disclosure of transactions between related parties [line items]
Payables	299	299
Other payables [member] | Little Big Pictures [Member]
Disclosure of transactions between related parties [line items]
Payables	6	9
Other payables [member] | Others [member]
Disclosure of transactions between related parties [line items]
Payables	3,029	2,932
Lease liabilities [member]
Disclosure of transactions between related parties [line items]
Payables	6,732	₩ 8,824
Lease liabilities [member] | K-Realty 11th Real Estate Investment Trust Company [Member]
Disclosure of transactions between related parties [line items]
Payables	₩ 6,732

Related Party Transactions - _2

Related Party Transactions - Summary of Significant Transactions with Related Parties (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure of transactions between related parties [line items]
Operating Revenue	₩ 50,650	₩ 41,925	₩ 296,186
Purchases	58,339	54,222	37,774
K-Realty CR-REITs No.1 [member]
Disclosure of transactions between related parties [line items]
Operating Revenue			238,847
Purchases			1,308
HD Hyundai Robotics Co., Ltd.(formerly Hyundai Robotics Co., Ltd.) [member]
Disclosure of transactions between related parties [line items]
Operating Revenue	78
Purchases	182
K-Realty 11th Real Estate Investment Trust Company [Member]
Disclosure of transactions between related parties [line items]
Operating Revenue	346	330
Purchases	2,559	1,674
K-Realty 11th Real Estate Investment Trust Company [member]
Disclosure of transactions between related parties [line items]
Operating Revenue	6,216
Others [member]
Disclosure of transactions between related parties [line items]
Operating Revenue	21,308	11,964	28,092
Purchases	42,169	37,742	21,302
Digital Pharm Co., Ltd [Member]
Disclosure of transactions between related parties [line items]
Operating Revenue	1	1
K Bank [member]
Disclosure of transactions between related parties [line items]
Operating Revenue	22,701	29,536	24,247
Purchases	₩ 13,429	11,007	15,164
IGIS Professional Investors Private Investment Real Estate Investment LLC No.395 [Member]
Disclosure of transactions between related parties [line items]
Operating Revenue			₩ 5,000
Hyundai Robotics Co., Ltd [Member]
Disclosure of transactions between related parties [line items]
Operating Revenue		94
Purchases		₩ 3,799

Related Party Transactions - _3

Related Party Transactions - Summary of Key Management Compensation (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure of transactions between related parties [abstract]
Salaries and other short-term benefits	₩ 1,494	₩ 1,855	₩ 2,189
Post-employment benefits	153	294	412
Share-based compensation	569	976	669
Total	₩ 2,216	₩ 3,125	₩ 3,270

Related Party Transactions - _4

Related Party Transactions - Summary of Transactions Prior Liquidation (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Acquisition of right of use assets [member]
Statement [Line Items]
Dividend Income	₩ 7	₩ 1,966
Acquisition of right of use assets [member] | HD Hyundai Robotics Co., Ltd.(formerly Hyundai Robotics Co., Ltd.) [member]
Statement [Line Items]
Dividend Income	0
Acquisition of right of use assets [member] | K-Realty 11th Real Estate Investment Trust Company [Member]
Statement [Line Items]
Dividend Income	7	1,966
Interest income [member]
Statement [Line Items]
Dividend Income	8,264	3,052	₩ 223
Interest income [member] | Korea Information & Technology Investment Fund (KIF Investment Fund) [member]
Statement [Line Items]
Dividend Income			223
Interest income [member] | K Bank Inc.[Member]
Statement [Line Items]
Dividend Income	8,264	3,052
Interest Expense [member]
Statement [Line Items]
Payables	261	260	205
Interest Expense [member] | K-Realty CR-REITs No.1 [member]
Statement [Line Items]
Payables			205
Interest Expense [member] | K-Realty 11th Real Estate Investment Trust Company [Member]
Statement [Line Items]
Payables	261	260
Dividend Income [member]
Statement [Line Items]
Dividend Income	1,786	54,869	48,779
Dividend Income [member] | K-Realty CR-REITs No.1 [member]
Statement [Line Items]
Dividend Income		45,549	40,142
Dividend Income [member] | K-Realty 11th Real Estate Investment Trust Company [Member]
Statement [Line Items]
Dividend Income	507	162
Dividend Income [member] | Others [member]
Statement [Line Items]
Dividend Income	₩ 1,279	₩ 9,158	₩ 8,637

Related Party Transactions - _5

Related Party Transactions - Summary of Fund Transactions with Related Parties (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure of transactions between related parties [line items]
Equity contributions in cash	₩ 122,535	₩ 278,138	₩ 462,888
Borrowings		31,916
Repayments	1,037	771	15,964
K-REALTY CR-REIT [member]
Disclosure of transactions between related parties [line items]
Repayments			15,964
K Bank Inc.[Member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash			424,957
Pacific Professional Investors Private Investment Real Estate Investment LLC No.55 [Member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash			11,000
KT Young Entrepreneurs DNA Investment Fund [Member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash			8,400
Mastern KT MultiFamily Real Estate Private Equity Investment Fund 1 [Member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash			6,055
KT-IBKC future investment fund [member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash			(5,700)
Megazone Cloud Corporation [Member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash		130,001
Borrowings		30,000
IBK KT Emerging Digital Industry Investment Fund [Member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash		10,800
Mastern KT MultiFamily Real Estate Private Equity Investment Fund [Member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash		18,859
IGIS No. 4681 General Private Real Estate Investment Company [Member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash		25,000
K-Realty 11th Real Estate Investment Trust Company [Member]
Disclosure of transactions between related parties [line items]
Borrowings		1,916
Repayments	1,037	771
STIC Place General Private Placement Real Estate Investment Trust No.2 [Member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash	20,000
Telco Credit Bureau Co.,Ltd. [Member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash	6,500
Pacific geumto no.75 private hybrid asset fund [Member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash	19,000
Kiamco Data Center Blind Fund [Member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash	15,000
STIC Mixed Asset Investment Trust No.1 [Member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash	10,930
Other [member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash	31,107	₩ 93,478	₩ 18,176
Rebellions Co.,Ltd. [Member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash	₩ 19,998

Related Party Transactions - Ad

Related Party Transactions - Additional Information (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2023	Dec. 31, 2022
Kiamco Data Center Blind Fund [Member]
Disclosure of transactions between related parties [line items]
Investment in related party	₩ 107,774
K Bank Inc. [Member]
Disclosure of transactions between related parties [line items]
Credit card contract threshold limit	₩ 1,050	₩ 1,000

Financial Risk Management - Sum

Financial Risk Management - Summary of Exposures to Risks, Effects on Profit before Income Tax and Shareholders' Equity (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
10% strengthening in foreign exchange rate [member]
Disclosure of detailed information about financial instruments [line items]
Fluctuation of foreign exchange rate	10%	10%	10%
Impact on profit before income tax	₩ (10,313)	₩ (5,841)	₩ (3,433)
Impact on equity	₩ (18,460)	₩ (15,836)	₩ 8,692
10% weakening in foreign exchange rate [member]
Disclosure of detailed information about financial instruments [line items]
Fluctuation of foreign exchange rate	10%	10%	10%
Impact on profit before income tax	₩ 10,313	₩ 5,841	₩ 3,433
Impact on equity	₩ 18,460	₩ 15,836	₩ (8,692)
10% percentage increase in market equity price [member]
Disclosure of detailed information about financial instruments [line items]
Fluctuation of price	10%	10%	10%
Impact on profit before income tax	₩ 1,473	₩ 2,660	₩ 2,000
Impact on equity	₩ 121,423	₩ 113,948	₩ 4,588
10% decrease in market equity price [member]
Disclosure of detailed information about financial instruments [line items]
Fluctuation of price	10%	10%	10%
Impact on profit before income tax	₩ (1,473)	₩ (2,660)	₩ (2,000)
Impact on equity	₩ (121,423)	₩ (113,948)	₩ (4,588)
100 basis point increase in market interest rate [Member]
Disclosure of detailed information about financial instruments [line items]
Fluctuation of interest rate	1%	1%	1%
Impact on profit before income tax	₩ (2,693)	₩ 635	₩ 753
Impact on equity	₩ (4,718)	₩ (2,045)	₩ 5,549
100 basis point decrease in market interest rate [Member]
Disclosure of detailed information about financial instruments [line items]
Fluctuation of interest rate	1%	1%	1%
Impact on profit before income tax	₩ 2,696	₩ (669)	₩ (731)
Impact on equity	₩ 5,037	₩ 2,100	₩ (5,675)

Financial Risk Management - S_2

Financial Risk Management - Summary of Details of Financial Assets and Liabilities in Foreign Currencies (Detail) € in Thousands, ₫ in Thousands, ₨ in Thousands, ฿ in Thousands, лв in Thousands, ¥ in Thousands, £ in Thousands, XDR in Thousands, Tsh in Thousands, SFr in Thousands, RM in Thousands, P in Thousands, FRw in Thousands, $ in Thousands, $ in Thousands, $ in Thousands, $ in Thousands, ₩ in Millions

Dec. 31, 2023 USD ($)

Dec. 31, 2023 XDR

Dec. 31, 2023 JPY (¥)

Dec. 31, 2023 EUR (€)

Dec. 31, 2023 RWF (FRw)

Dec. 31, 2023 THB (฿)

Dec. 31, 2023 TZS (Tsh)

Dec. 31, 2023 BWP (P)

Dec. 31, 2023 VND (₫)

Dec. 31, 2023 SGD ($)

Dec. 31, 2023 TWD ($)

Dec. 31, 2023 CHF (SFr)

Dec. 31, 2023 PKR (₨)

Dec. 31, 2023 KRW (₩)

Dec. 31, 2022 USD ($)

Dec. 31, 2022 XDR

Dec. 31, 2022 JPY (¥)

Dec. 31, 2022 GBP (£)

Dec. 31, 2022 EUR (€)

Dec. 31, 2022 RWF (FRw)

Dec. 31, 2022 THB (฿)

Dec. 31, 2022 TZS (Tsh)

Dec. 31, 2022 BWP (P)

Dec. 31, 2022 HKD ($)

Dec. 31, 2022 VND (₫)

Dec. 31, 2022 SGD ($)

Dec. 31, 2022 MYR (RM)

Dec. 31, 2022 BGN (лв)

Dec. 31, 2022 KRW (₩)

Dec. 31, 2021 USD ($)

Dec. 31, 2021 XDR

Dec. 31, 2021 JPY (¥)

Dec. 31, 2021 GBP (£)

Dec. 31, 2021 EUR (€)

Dec. 31, 2021 RWF (FRw)

Dec. 31, 2021 THB (฿)

Dec. 31, 2021 TZS (Tsh)

Dec. 31, 2021 BWP (P)

Dec. 31, 2021 HKD ($)

Dec. 31, 2021 VND (₫)

Dec. 31, 2021 SGD ($)

Dec. 31, 2021 TWD ($)

Dec. 31, 2021 CHF (SFr)

Disclosure of detailed information about financial instruments [line items]

Financial assets

₩ 15,486,942

₩ 13,766,638

Financial liabilities

₩ 19,611,825

₩ 18,825,390

Currency risk [Member]

Disclosure of detailed information about financial instruments [line items]

Financial assets

$ 139,807

XDR 254

¥ 17,496

€ 304

FRw 402

฿ 244

Tsh 21,958

P 680

₫ 380,629

$ 1,375

$ 1,685

₨ 114,025

$ 106,426

XDR 255

¥ 32,801

£ 30

€ 185

FRw 15,521

฿ 265

Tsh 1,464

P 183

$ 37

₫ 280,226

$ 448

RM 1

лв 62

$ 245,759

XDR 255

¥ 29,227

€ 3,943

FRw 586

฿ 2,160

Tsh 1,644

P 93

₫ 257,895

$ 13

Financial liabilities

$ 2,271,673

XDR 722

¥ 400,002

€ 7,810

SFr 25

$ 2,336,607

XDR 722

¥ 400,002

£ 83

€ 7,832

FRw 13,025

$ 284,000

$ 2,302,642

XDR 722

¥ 30,000,763

£ 1,005

€ 10,801

$ 105

$ 284,000

$ 226

SFr 161

Financial Risk Management - S_3

Financial Risk Management - Summary of Maximum Exposure to Credit Risk (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2023	Dec. 31, 2022
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk	₩ 14,707,856	₩ 13,027,594
Cash and cash equivalents (except for cash on hand) [member]
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk	2,869,285	2,437,629
Financial assets at amortized costs [member]
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk	8,458,259	7,459,994
Financial assets at fair value through other comprehensive income [member]
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk	116,198	129,124
Contract assets [member]
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk	832,520	802,253
Derivatives financial assets for hedging [member]
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk	159,211	190,830
Financial assets at fair value through profit or loss [member]
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk	880,549	942,274
Financial assets at fair value through other comprehensive income [member]
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk	5,913	5,432
Financial assets at amortized costs [member]
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk	₩ 1,385,921	₩ 1,060,058

Financial Risk Management - S_4

Financial Risk Management - Summary of Expected Credit Losses Reflect Forward-Looking Information (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2023	Dec. 31, 2022
Disclosure of provision matrix [line items]
Expected credit loss rate	0%	0%
Financial assets	₩ 15,486,942	₩ 13,766,638
Less than 6 months [member]
Disclosure of provision matrix [line items]
Expected credit loss rate	5.43%	5.57%
7-12 months [member]
Disclosure of provision matrix [line items]
Expected credit loss rate	21.72%	25.84%
More than 1 years [member]
Disclosure of provision matrix [line items]
Expected credit loss rate	54.55%	67.16%
Carrying amounts [member]
Disclosure of provision matrix [line items]
Financial assets	₩ 3,770,489	₩ 3,700,050
Carrying amounts [member] | Less than 6 months [member]
Disclosure of provision matrix [line items]
Financial assets	3,466,588	3,443,163
Carrying amounts [member] | 7-12 months [member]
Disclosure of provision matrix [line items]
Financial assets	68,772	49,491
Carrying amounts [member] | More than 1 years [member]
Disclosure of provision matrix [line items]
Financial assets	235,129	207,396
Provision for impairment [member]
Disclosure of provision matrix [line items]
Financial assets	(331,290)	(343,738)
Provision for impairment [member] | Less than 6 months [member]
Disclosure of provision matrix [line items]
Financial assets	(188,086)	(191,668)
Provision for impairment [member] | 7-12 months [member]
Disclosure of provision matrix [line items]
Financial assets	(14,940)	(12,789)
Provision for impairment [member] | More than 1 years [member]
Disclosure of provision matrix [line items]
Financial assets	₩ (128,264)	₩ (139,281)

Financial Risk Management - S_5

Financial Risk Management - Summary of Details of Changes in Provisions for Impairment of Trade Receivables and Other Financial Assets at Amortized Costs (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Trade receivables [member]
Disclosure of financial assets [line items]
Beginning balance	₩ 343,738	₩ 349,725
Provision	69,972	64,522
Written-off	(80,126)	(68,298)
Others	(2,294)	(2,211)
Ending balance	331,290	343,738
Financial assets at amortised cost, class [member]
Disclosure of financial assets [line items]
Beginning balance	218,543	201,387
Provision	114,501	65,941
Written-off	(150,014)	(51,383)
Others	15,547	3,448
Reversal	(14,941)	(850)
Ending balance	₩ 183,636	₩ 218,543

Financial Risk Management - S_6

Financial Risk Management - Summary of Impairment of Trade Receivable (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Trade receivables [member]
Disclosure of impairment loss and reversal of impairment loss [line items]
Impairment loss Bad debt expenses	₩ 69,972	₩ 64,522

Financial Risk Management - S_7

Financial Risk Management - Summary of Contractual Undiscounted Cash Flows (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2023	Dec. 31, 2022
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]
Trade and other payables	₩ 8,922,416	₩ 8,483,110
Borrowings (including debentures)	10,693,722	11,016,756
Lease liabilities	1,340,166	1,336,761
Other non-derivative financial liabilities	1,130,037	336,178
Financial guarantee contracts	116,719	26,206
Total	22,203,060	21,199,011
Less than 1 year [member]
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]
Trade and other payables	8,184,036	7,386,703
Borrowings (including debentures)	2,922,557	2,028,207
Lease liabilities	313,431	313,162
Other non-derivative financial liabilities	372,743	33,279
Financial guarantee contracts	13,719	21,618
Total	11,806,486	9,782,969
1-5 years [member]
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]
Trade and other payables	730,340	1,009,559
Borrowings (including debentures)	6,027,323	6,972,077
Lease liabilities	617,561	615,766
Other non-derivative financial liabilities	747,221	209,155
Financial guarantee contracts	103,000
Total	8,225,445	8,806,557
More than 5 years [member]
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]
Trade and other payables	8,040	86,848
Borrowings (including debentures)	1,743,842	2,016,472
Lease liabilities	409,174	407,833
Other non-derivative financial liabilities	10,073	93,744
Financial guarantee contracts	0	4,588
Total	₩ 2,171,129	₩ 2,609,485

Financial Risk Management - S_8

Financial Risk Management - Summary of Cash Outflow and Inflow of Derivatives Settled Gross or Net are Undiscounted Contractual Cash Flow (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Derivatives held for trading
Outflows	₩ 133,293	₩ 102,924	₩ 158,284
Inflow	1,015
Derivatives settled gross
Outflow	1,976,432	2,994,649	3,078,733
Inflow	2,849,368	3,258,353	3,167,878
Less than 1 year [member]
Derivatives held for trading
Outflows	0	0	0
Inflow	0
Derivatives settled gross
Outflow	741,140	472,005	843,489
Inflow	614,066	550,478	856,508
1-5 years [member]
Derivatives held for trading
Outflows	133,293	101,994	158,284
Inflow	0
Derivatives settled gross
Outflow	1,227,166	2,493,858	1,857,942
Inflow	2,198,958	2,670,002	1,917,236
More than 5 years [member]
Derivatives held for trading
Outflows	0	930	0
Inflow	1,015
Derivatives settled gross
Outflow	8,126	28,786	377,302
Inflow	₩ 36,344	₩ 37,873	₩ 394,134

Financial Risk Management - S_9

Financial Risk Management - Summary of Debt-to-equity Ratios (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure of detailed information about financial instruments [abstract]
Total liabilities	₩ 24,249,073	₩ 22,577,114
Total equity	₩ 18,542,575	₩ 18,412,696	₩ 16,567,161	₩ 15,551,433
Debt-to-equity ratio	131%	123%

Financial Risk Management - _10

Financial Risk Management - Summary of Gearing Ratios (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure of detailed information about financial instruments [abstract]
Total borrowings	₩ 10,218,165	₩ 10,006,685
Less: cash and cash equivalents	(2,879,554)	(2,449,062)	₩ (3,019,592)	₩ (2,634,624)
Net debt	7,338,611	7,557,623
Total equity	18,542,575	18,412,696	₩ 16,567,161	₩ 15,551,433
Total capital	₩ 25,881,186	₩ 25,970,319
Gearing ratio	28%	29%

Financial Risk Management - _11

Financial Risk Management - Summary of Group's Recognized Financial Assets Subject to Enforceable Master Netting Arrangements or Similar Agreements (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2023	Dec. 31, 2022
Disclosure of offsetting of financial assets [line items]
Gross assets	₩ 79,174	₩ 61,276
Gross liabilities offset	(2,164)	(764)
Net amounts presented in the statement of financial position	77,010	65,012
Amounts not offset, Financial instruments	(59,150)	(44,518)
Net amount	17,860	15,994
Trade receivables [member]
Disclosure of offsetting of financial assets [line items]
Gross assets	78,415	60,512
Gross liabilities offset	(1,407)
Net amounts presented in the statement of financial position	77,008	60,512
Amounts not offset, Financial instruments	(59,148)	(44,518)
Net amount	17,860	15,994
Other financial assets [Member]
Disclosure of offsetting of financial assets [line items]
Gross assets	759	764
Gross liabilities offset	(757)	₩ (764)
Net amounts presented in the statement of financial position	2
Amounts not offset, Financial instruments	₩ (2)

Financial Risk Management - _12

Financial Risk Management - Summary of Group's Recognized Financial Liabilities Subject to Enforceable Master Netting Arrangements or Similar Agreements (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2023	Dec. 31, 2022
Disclosure of offsetting of financial liabilities [Line Items]
Gross liabilities	₩ 63,964
Gross assets offset	(2,164)
Net amounts presented in the statement of financial position	61,800
Amounts not offset, Financial instruments	(59,151)
Net amount	2,649
Trade payables [member]
Disclosure of offsetting of financial liabilities [Line Items]
Gross liabilities	59,602	₩ 47,271
Gross assets offset	(757)	(764)
Net amounts presented in the statement of financial position	58,845	46,507
Amounts not offset, Financial instruments	(56,196)	(44,518)
Net amount	2,649	₩ 1,989
Other [member]
Disclosure of offsetting of financial liabilities [Line Items]
Gross liabilities	4,362
Gross assets offset	(1,407)
Net amounts presented in the statement of financial position	2,955
Amounts not offset, Financial instruments	₩ (2,955)

Financial Risk Management - Add

Financial Risk Management - Additional Information (Detail) $ in Thousands, ₩ in Millions	Dec. 31, 2023 KRW (₩)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 KRW (₩)
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk	₩ 14,707,856		₩ 13,027,594
Maximum exposure to credit risk of loans or receivables	3,439,199		3,356,312
Financial guarantee contracts [member]
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk	116,719		₩ 26,206
Kiamco Data Center Blind Fund [Member]
Disclosure of detailed information about financial instruments [line items]
Investment In Related Party	107,774
Future Innovation Private Equity Fund No.3 [Member]
Disclosure of detailed information about financial instruments [line items]
Amounts payable, related party transactions	₩ 4,132	$ 30,350

Fair Value - Summary of Carryin

Fair Value - Summary of Carrying Amount and Fair Value of Financial Instruments by Category (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2023	Dec. 31, 2022
Disclosure of detailed information about financial instruments [line items]
Financial assets	₩ 15,486,942	₩ 13,766,638
Financial liabilities	19,611,825	18,825,390
Trade and other payables [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	8,317,822	8,397,264
Borrowings [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	10,218,165	10,006,685
Financial liabilities at amortized cost [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	915,185	246,606
Financial liabilities at fair value through profit or loss [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	136,106	141,280
Derivative financial liabilities for hedging purpose [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	24,547	33,555
Cash and cash equivalents [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	2,879,554	2,449,062
Financial assets at amortized costs [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	8,326,229	7,364,516
Financial assets at fair value through other comprehensive income [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	116,198	129,124
Other financial assets at amortized costs [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	1,385,921	1,060,058
Financial assets at fair value through profit or loss [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	939,661	1,064,856
Other financial assets at fair value through other comprehensive income [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	1,680,168	1,508,192
Derivative financial assets for hedging [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	159,211	190,830
Fair value [member] | Trade and other payables [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	1	1
Fair value [member] | Borrowings [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	9,979,545	9,405,992
Fair value [member] | Financial liabilities at amortized cost [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	1	1
Fair value [member] | Financial liabilities at fair value through profit or loss [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	136,106	141,280
Fair value [member] | Derivative financial liabilities for hedging purpose [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	24,547	33,555
Fair value [member] | Cash and cash equivalents [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	1	1
Fair value [member] | Financial assets at amortized costs [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	1	1
Fair value [member] | Financial assets at fair value through other comprehensive income [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	116,198	129,124
Fair value [member] | Other financial assets at amortized costs [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	1	1
Fair value [member] | Financial assets at fair value through profit or loss [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	939,661	1,064,856
Fair value [member] | Other financial assets at fair value through other comprehensive income [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	1,680,168	1,508,192
Fair value [member] | Derivative financial assets for hedging [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	₩ 159,211	₩ 190,830

Fair Value - Summary of Fair Va

Fair Value - Summary of Fair Value Non of Financial Instruments (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2023	Dec. 31, 2022
Disclosure of detailed information about financial instruments [line items]
Non financial assets	₩ 8,171,407	₩ 8,263,049
Non financial liabilities	10,140,198	9,580,827
Level 1 [Member]
Disclosure of detailed information about financial instruments [line items]
Non financial assets	1,244,847	1,032,547
Level 2 [Member]
Disclosure of detailed information about financial instruments [line items]
Non financial assets	437,533	750,144
Non financial liabilities	10,005,637	9,439,547
Level 3 [Member]
Disclosure of detailed information about financial instruments [line items]
Non financial assets	6,489,027	6,480,358
Non financial liabilities	134,561	141,280
Financial assets at fair value through other comprehensive income [member]
Disclosure of detailed information about financial instruments [line items]
Non financial assets	116,198	129,124
Financial assets at fair value through other comprehensive income [member] | Level 1 [Member]
Disclosure of detailed information about financial instruments [line items]
Non financial assets	0
Financial assets at fair value through other comprehensive income [member] | Level 2 [Member]
Disclosure of detailed information about financial instruments [line items]
Non financial assets	116,198	129,124
Financial assets at fair value through other comprehensive income [member] | Level 3 [Member]
Disclosure of detailed information about financial instruments [line items]
Non financial assets	0
Financial assets at fair value through profit or loss [member]
Disclosure of detailed information about financial instruments [line items]
Non financial assets	939,661	1,064,856
Financial assets at fair value through profit or loss [member] | Level 1 [Member]
Disclosure of detailed information about financial instruments [line items]
Non financial assets	13,911	26,647
Financial assets at fair value through profit or loss [member] | Level 2 [Member]
Disclosure of detailed information about financial instruments [line items]
Non financial assets	156,918	426,140
Financial assets at fair value through profit or loss [member] | Level 3 [Member]
Disclosure of detailed information about financial instruments [line items]
Non financial assets	768,832	612,069
Other financial assets at fair value through other comprehensive income [member]
Disclosure of detailed information about financial instruments [line items]
Non financial assets	1,680,168	1,508,192
Other financial assets at fair value through other comprehensive income [member] | Level 1 [Member]
Disclosure of detailed information about financial instruments [line items]
Non financial assets	1,230,936	1,005,900
Other financial assets at fair value through other comprehensive income [member] | Level 2 [Member]
Disclosure of detailed information about financial instruments [line items]
Non financial assets	5,206	5,163
Other financial assets at fair value through other comprehensive income [member] | Level 3 [Member]
Disclosure of detailed information about financial instruments [line items]
Non financial assets	444,026	497,129
Derivative financial assets for hedging [member]
Disclosure of detailed information about financial instruments [line items]
Non financial assets	159,211	190,830
Derivative financial assets for hedging [member] | Level 2 [Member]
Disclosure of detailed information about financial instruments [line items]
Non financial assets	159,211	189,717
Derivative financial assets for hedging [member] | Level 3 [Member]
Disclosure of detailed information about financial instruments [line items]
Non financial assets	0	1,113
Investment Properties [member]
Disclosure of detailed information about financial instruments [line items]
Non financial assets	5,276,169	5,370,047
Investment Properties [member] | Level 3 [Member]
Disclosure of detailed information about financial instruments [line items]
Non financial assets	5,276,169	5,370,047
Borrowings [Member]
Disclosure of detailed information about financial instruments [line items]
Non financial liabilities	9,979,545	9,405,992
Borrowings [Member] | Level 2 [Member]
Disclosure of detailed information about financial instruments [line items]
Non financial liabilities	9,979,545	9,405,992
Other financial liabilities at fair value through profit or loss [member]
Disclosure of detailed information about financial instruments [line items]
Non financial liabilities	136,106	141,280
Other financial liabilities at fair value through profit or loss [member] | Level 2 [Member]
Disclosure of detailed information about financial instruments [line items]
Non financial liabilities	1,545	0
Other financial liabilities at fair value through profit or loss [member] | Level 3 [Member]
Disclosure of detailed information about financial instruments [line items]
Non financial liabilities	134,561	141,280
Derivative financial liabilities for hedging purpose [member]
Disclosure of detailed information about financial instruments [line items]
Non financial liabilities	24,547	33,555
Derivative financial liabilities for hedging purpose [member] | Level 2 [Member]
Disclosure of detailed information about financial instruments [line items]
Non financial liabilities	₩ 24,547	₩ 33,555

Fair Value - Summary of Changes

Fair Value - Summary of Changes in Level 3 of Fair Value Hierarchy for Recurring Fair Value Measurements (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Disclosure of detailed information about financial instruments [line items]
Beginning balance	₩ 13,766,638
Ending balance	15,486,942	₩ 13,766,638
Beginning balance	18,825,390
Ending balance	19,611,825	18,825,390
Financial assets at fair value through profit or loss [member]
Disclosure of detailed information about financial instruments [line items]
Beginning balance	1,064,856
Ending balance	939,661	1,064,856
Recurring fair value measurement [Member] | Level 3 [Member] | Derivative financial assets for hedging [member]
Disclosure of detailed information about financial instruments [line items]
Beginning balance	1,113	31,565
Reclassification	(1,113)
Disposal	0	(31,565)
Amount recognized in profit or loss	0	0
Amount recognized in other comprehensive income	0	1,113
Ending balance	0	1,113
Recurring fair value measurement [Member] | Level 3 [Member] | Financial liabilities designated as at fair value through profit or loss [member]
Disclosure of detailed information about financial instruments [line items]
Beginning balance	141,280	215,332
Purchases	0	3,046
Reclassification	(7,363)	(54,921)
Disposal	(5,205)
Amount recognized in profit or loss	5,849	(22,177)
Ending balance	134,561	141,280
Recurring fair value measurement [Member] | Level 3 [Member] | Financial assets at fair value through profit or loss [member]
Disclosure of detailed information about financial instruments [line items]
Beginning balance	612,069	577,085
Purchases	216,838	226,310
Reclassification	26,471	(8,962)
Acquisition and disposition of businesses	252	0
Disposal	(44,323)	(179,740)
Amount recognized in profit or loss	(42,475)	(2,624)
Ending balance	768,832	612,069
Recurring fair value measurement [Member] | Level 3 [Member] | Financial assets at fair value through other comprehensive income [member]
Disclosure of detailed information about financial instruments [line items]
Beginning balance	497,129	323,373
Purchases	10,267	262,408
Reclassification	(5,532)	8,122
Acquisition and disposition of businesses	0	(40)
Disposal	(6)	(97,426)
Amount recognized in profit or loss	(61)	18
Amount recognized in other comprehensive income	(57,771)	674
Ending balance	₩ 444,026	₩ 497,129

Fair Value - Summary of Valuati

Fair Value - Summary of Valuation Techniques and Inputs (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Assets
Financial assets at fair value through other comprehensive income	₩ 1,680,168	₩ 1,508,192
Other financial assets
Financial assets at fair value through profit or loss	939,661	1,064,856
Derivative financial assets for hedging	159,211	190,830
Investment properties	2,198,135	1,933,358	₩ 1,720,654
Liabilities
Borrowing	10,218,165	10,006,685
Other financial liabilities
Financial liabilities at fair value through profit or loss	136,106	141,280
Derivative financial liabilities for hedging	24,547	33,555
Level 2 [Member]
Other financial assets
Derivative financial assets for hedging	159,211
Liabilities
Borrowing	₩ 9,979,545	₩ 9,405,992
Other financial liabilities
Valuation techniques	DCF Model
Valuation techniques	DCF Model	DCF Model
Description of inputs used in fair value measurement, assets	Market observation discount rate,Swap interest rate
Description of inputs used in fair value measurement, liabilities	Bond interest rate	Bond interest rate
Level 2 [Member] | Derivative financial liabilities for hedging [member]
Other financial liabilities
Derivative financial liabilities for hedging	₩ 24,547	₩ 33,555
Valuation techniques	DCF Model	DCF Model
Description of inputs used in fair value measurement, liabilities	Market observation discount rate	Market observation discount rate
Level 2 [Member] | Financial assets at fair value through other comprehensive income [member] | Trades and other receivables [member]
Assets
Financial assets at fair value through other comprehensive income	₩ 116,198	₩ 129,124
Other financial liabilities
Valuation techniques	DCF Model	DCF Model
Description of inputs used in fair value measurement, assets	Guaranteed bond interest rate	Guaranteed bond interest rate
Level 2, 3 [Member]
Other financial assets
Derivative financial assets for hedging		₩ 190,830
Other financial liabilities
Valuation techniques		DCF Model
Description of inputs used in fair value measurement, assets		Market observation discount rate,Swap interest rate
Level 2, 3 [Member] | Financial liabilities at fair value through profit or loss [member]
Other financial liabilities
Financial liabilities at fair value through profit or loss	₩ 136,106
Valuation techniques	DCF Model, Binomial Option Pricing Model,
Description of inputs used in fair value measurement, liabilities	Forward exchange rateForward interest rate
Level 2, 3 [Member] | Financial assets at fair value through profit or loss [member]
Other financial assets
Financial assets at fair value through profit or loss	₩ 925,750	₩ 1,038,209
Other financial liabilities
Valuation techniques	DCF Model, Adjusted Net Asset Model, Monte-Carlo Simulation	DCF Model, Adjusted Net Asset Model, Monte-Carlo Simulation
Description of inputs used in fair value measurement, assets	Market Interest rate, Underlying asset price	Market Interest rate,Underlying asset price
Level 2, 3 [Member] | Financial assets at fair value through other comprehensive income [member]
Assets
Financial assets at fair value through other comprehensive income	₩ 449,232	₩ 502,292
Other financial liabilities
Valuation techniques	DCF Model, Market Approach Model	DCF Model, Market Approach Model
Description of inputs used in fair value measurement, assets	Discount rate	Discount rate
Level 3 [Member]
Other financial assets
Investment properties	₩ 5,276,169	₩ 5,370,047
Other financial liabilities
Valuation techniques	DCF Model	DCF Model
Level 3 [Member] | Financial liabilities at fair value through profit or loss [member]
Other financial liabilities
Financial liabilities at fair value through profit or loss		₩ 141,280
Valuation techniques		DCF Model, Binomial Option Pricing Model, Monte-Carlo Simulation
Description of inputs used in fair value measurement, liabilities		Forward exchange rateForward interest rate

Fair Value - Summary of Details

Fair Value - Summary of Details and Changes of Total Deferred Difference (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Disclosure of detailed information about financial instruments [line items]
Beginning balance	₩ 13,766,638
Recognized at fair value through profit or loss	(939,661)	₩ (1,064,856)
Ending balance	15,486,942	13,766,638
Derivatives used for hedging [member]
Disclosure of detailed information about financial instruments [line items]
Beginning balance	0	832
New transactions	0	0
Recognized at fair value through profit or loss	0	(832)
Ending balance	₩ 0	₩ 0

Interests in Unconsolidated S_3

Interests in Unconsolidated Structured Entities - Summary of Unconsolidated Structured Entities and Nature of Risks (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Disclosure of unconsolidated structured entities [line items]
Other financial assets	₩ 4,164,961	₩ 3,823,936
Joint ventures and associates	1,556,889	1,480,722
Real Estate Finance [member]
Disclosure of unconsolidated structured entities [line items]
Total assets of unconsolidated structured entities	7,890,823	3,539,827
Other financial assets	216,040	77,819
Joint ventures and associates	144,517	123,138
Total	360,557	200,957
Maximum loss exposure Investment assets	360,557	200,957
Investment agreement and others	44,975	40,914
Total	405,532	241,871
PEF and Investment Funds [member]
Disclosure of unconsolidated structured entities [line items]
Total assets of unconsolidated structured entities	4,833,966	5,580,445
Other financial assets	227,266	237,907
Joint ventures and associates	282,550	268,275
Total	509,816	506,182
Maximum loss exposure Investment assets	509,816	506,182
Investment agreement and others	106,064	91,224
Total	615,880	597,406
Asset Securitization [member]
Disclosure of unconsolidated structured entities [line items]
Total assets of unconsolidated structured entities	1,846,270	2,044,989
Unconsolidated structured entities [member]
Disclosure of unconsolidated structured entities [line items]
Total assets of unconsolidated structured entities	14,571,059	11,165,261
Other financial assets	443,306	315,726
Joint ventures and associates	427,067	391,413
Total	870,373	707,139
Maximum loss exposure Investment assets	870,373	707,139
Investment agreement and others	151,039	132,138
Total	₩ 1,021,412	₩ 839,277

Information About Non-control_3

Information About Non-controlling Interests - Summary of Changes in Accumulated Non-controlling Interests (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure of subsidiaries [line items]
Accumulated non-controlling interests at the beginning of the year	₩ 1,802,551
Profit or loss allocated to non-controlling interests	(21,143)	₩ 125,165	₩ 102,517
Accumulated non-controlling interests at the end of the year	₩ 1,811,961	₩ 1,802,551
KT Skylife Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Non-controlling Interests rate(%)	49.40%	49.80%	49.70%
Accumulated non-controlling interests at the beginning of the year	₩ 423,189	₩ 410,695	₩ 388,900
Profit or loss allocated to non-controlling interests	(47,355)	7,127	24,795
Dividends paid to non-controlling interests	(8,287)	(8,284)	(8,279)
Others	(6,192)	13,651	5,279
Accumulated non-controlling interests at the end of the year	₩ 361,355	₩ 423,189	₩ 410,695
BC Card Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Non-controlling Interests rate(%)	30.50%	30.50%	30.50%
Accumulated non-controlling interests at the beginning of the year	₩ 524,657	₩ 498,928	₩ 411,826
Profit or loss allocated to non-controlling interests	25,355	47,909	34,496
Dividends paid to non-controlling interests	(4,960)	(7,641)	(6,434)
Others	3,023	(14,539)	59,040
Accumulated non-controlling interests at the end of the year	₩ 548,075	₩ 524,657	₩ 498,928
KTIS Corporation [Member]
Disclosure of subsidiaries [line items]
Non-controlling Interests rate(%)	66.70%	66.70%	68.60%
Accumulated non-controlling interests at the beginning of the year	₩ 141,402	₩ 135,240	₩ 120,071
Profit or loss allocated to non-controlling interests	5,947	14,965	17,715
Dividends paid to non-controlling interests	(2,451)	(2,226)	(1,837)
Others	(1,872)	(6,577)	(709)
Accumulated non-controlling interests at the end of the year	₩ 143,026	₩ 141,402	₩ 135,240
KTCS Corporation [Member]
Disclosure of subsidiaries [line items]
Non-controlling Interests rate(%)	78.30%	78.30%	79.70%
Accumulated non-controlling interests at the beginning of the year	₩ 153,881	₩ 145,111	₩ 129,502
Profit or loss allocated to non-controlling interests	14,228	18,888	21,394
Dividends paid to non-controlling interests	(3,001)	(2,721)	(2,211)
Others	(2,313)	(7,397)	(3,574)
Accumulated non-controlling interests at the end of the year	₩ 162,795	₩ 153,881	₩ 145,111
Nasmedia, Co., Ltd. [Member]
Disclosure of subsidiaries [line items]
Non-controlling Interests rate(%)	55.90%	56%	56%
Accumulated non-controlling interests at the beginning of the year	₩ 135,425	₩ 124,181	₩ 112,549
Profit or loss allocated to non-controlling interests	10,679	15,610	15,185
Dividends paid to non-controlling interests	(4,028)	(4,187)	(3,808)
Others	(467)	(179)	255
Accumulated non-controlling interests at the end of the year	₩ 141,609	₩ 135,425	₩ 124,181

Information About Non-control_4

Information About Non-controlling Interests - Summary of Financial Information on Subsidiaries (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure of subsidiaries [line items]
Current assets	₩ 14,594,246	₩ 12,690,014
Non-current assets	28,197,401	28,299,796
Current liabilities	13,247,637	10,699,268
Non-current liabilities	11,001,436	11,877,846
Equity	18,542,575	18,412,696	₩ 16,567,161	₩ 15,551,433
KT Skylife Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Current assets	425,661	420,701
Non-current assets	795,182	938,465
Current liabilities	353,839	274,637
Non-current liabilities	125,531	229,042
Equity	741,473	855,487
BC Card Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Current assets	3,739,847	3,152,622
Non-current assets	2,613,031	2,513,453
Current liabilities	3,661,263	2,879,551
Non-current liabilities	1,061,169	1,229,649
Equity	1,630,446	1,556,875
KTIS Corporation [Member]
Disclosure of subsidiaries [line items]
Current assets	111,313	102,121
Non-current assets	336,296	294,087
Current liabilities	116,271	103,698
Non-current liabilities	127,248	95,506
Equity	204,090	197,004
KTCS Corporation [Member]
Disclosure of subsidiaries [line items]
Current assets	304,508	296,209
Non-current assets	130,391	123,517
Current liabilities	187,621	188,379
Non-current liabilities	47,228	40,240
Equity	200,050	191,107
Nasmedia, Co., Ltd. [Member]
Disclosure of subsidiaries [line items]
Current assets	411,774	435,359
Non-current assets	101,537	81,586
Current liabilities	251,207	261,381
Non-current liabilities	11,129	14,349
Equity	₩ 250,975	₩ 241,215

Information About Non-control_5

Information About Non-controlling Interests - Summary of consolidated statements of comprehensive income (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure of Summarized Consolidated Statements of Comprehensive Income of Subsidiaries [Line Items]
Operating revenue	₩ 26,287,201	₩ 25,638,855	₩ 24,898,005
Profit (loss) for the year	972,182	1,385,635	1,459,395
Other comprehensive income(loss)	7,447	(2,194)	165,567
Total comprehensive income	979,629	1,383,441	1,624,962
KT Skylife Co., Ltd. [member]
Disclosure of Summarized Consolidated Statements of Comprehensive Income of Subsidiaries [Line Items]
Operating revenue	1,034,342	1,038,468	772,950
Profit (loss) for the year	(109,407)	20,941	62,309
Other comprehensive income(loss)	(6,625)	13,544	12,686
Total comprehensive income	(116,032)	34,485	74,995
BC Card Co., Ltd. [member]
Disclosure of Summarized Consolidated Statements of Comprehensive Income of Subsidiaries [Line Items]
Operating revenue	4,027,450	3,897,090	3,580,970
Profit (loss) for the year	76,545	148,341	120,308
Other comprehensive income(loss)	13,832	(5,286)	2,270
Total comprehensive income	90,377	143,055	122,578
KTIS Corporation [Member]
Disclosure of Summarized Consolidated Statements of Comprehensive Income of Subsidiaries [Line Items]
Operating revenue	593,162	536,229	487,801
Profit (loss) for the year	13,922	15,917	24,944
Other comprehensive income(loss)	(3,162)	(2,415)	3,725
Total comprehensive income	10,760	13,502	28,669
KTCS Corporation [Member]
Disclosure of Summarized Consolidated Statements of Comprehensive Income of Subsidiaries [Line Items]
Operating revenue	1,035,911	1,031,010	968,499
Profit (loss) for the year	15,804	17,634	19,034
Other comprehensive income(loss)	(2,550)	(134)	(2,120)
Total comprehensive income	13,254	17,500	16,914
Nasmedia, Co., Ltd. [Member]
Disclosure of Summarized Consolidated Statements of Comprehensive Income of Subsidiaries [Line Items]
Operating revenue	147,934	153,210	125,876
Profit (loss) for the year	17,703	27,691	27,120
Other comprehensive income(loss)	(1,890)	(695)	871
Total comprehensive income	₩ 15,813	₩ 26,996	₩ 27,991

Information About Non-control_6

Information About Non-controlling Interests - Summary of consolidated statements of cash flows (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure of Summarized Consolidated Statements of Cash Flows of Subsidiaries [Line Items]
Cash flows from operating activities	₩ 5,503,289	₩ 3,597,065	₩ 5,561,834
Cash flows from investing activities	(4,620,508)	(4,838,643)	(5,137,474)
Cash flows from financing activities	(452,792)	669,331	(41,282)
Net increase (decrease) in cash and cash equivalents	430,492	(570,530)	384,968
Cash and cash equivalents at beginning of year	2,449,062	3,019,592	2,634,624
Exchange differences	503	1,717	1,890
Cash and cash equivalents at end of year	2,879,554	2,449,062	3,019,592
KT Skylife Co., Ltd. [member]
Disclosure of Summarized Consolidated Statements of Cash Flows of Subsidiaries [Line Items]
Cash flows from operating activities	207,207	176,407	102,947
Cash flows from investing activities	(125,343)	(78,928)	(352,116)
Cash flows from financing activities	(50,811)	(79,455)	230,010
Net increase (decrease) in cash and cash equivalents	31,053	18,024	(19,159)
Cash and cash equivalents at beginning of year	98,695	80,672	99,834
Exchange differences		(1)	(3)
Cash and cash equivalents at end of year	129,748	98,695	80,672
BC Card Co., Ltd. [member]
Disclosure of Summarized Consolidated Statements of Cash Flows of Subsidiaries [Line Items]
Cash flows from operating activities	82,883	(798,043)	(157,645)
Cash flows from investing activities	(74,430)	(7,733)	(283,313)
Cash flows from financing activities	(67,609)	914,441	526,563
Net increase (decrease) in cash and cash equivalents	(59,156)	108,665	85,605
Cash and cash equivalents at beginning of year	435,047	326,482	240,584
Exchange differences	(95)	(100)	293
Cash and cash equivalents at end of year	375,796	435,047	326,482
KTIS Corporation [Member]
Disclosure of Summarized Consolidated Statements of Cash Flows of Subsidiaries [Line Items]
Cash flows from operating activities	50,892	13,809	49,011
Cash flows from investing activities	(17,636)	9,813	(27,143)
Cash flows from financing activities	(32,872)	(29,199)	(23,126)
Net increase (decrease) in cash and cash equivalents	384	(5,577)	(1,258)
Cash and cash equivalents at beginning of year	24,944	30,521	31,779
Cash and cash equivalents at end of year	25,328	24,944	30,521
KTCS Corporation [Member]
Disclosure of Summarized Consolidated Statements of Cash Flows of Subsidiaries [Line Items]
Cash flows from operating activities	55,146	19,423	6,945
Cash flows from investing activities	(5,901)	13,245	(1,039)
Cash flows from financing activities	(26,948)	(35,578)	(16,622)
Net increase (decrease) in cash and cash equivalents	22,297	(2,910)	(10,716)
Cash and cash equivalents at beginning of year	61,814	63,884	75,440
Exchange differences		840	(840)
Cash and cash equivalents at end of year	84,111	61,814	63,884
Nasmedia Co Ltd [Member]
Disclosure of Summarized Consolidated Statements of Cash Flows of Subsidiaries [Line Items]
Cash flows from operating activities	8,116	22,015	44,500
Cash flows from investing activities	(30,910)	3,845	(16,966)
Cash flows from financing activities	(11,077)	(11,136)	(9,843)
Net increase (decrease) in cash and cash equivalents	(33,871)	14,724	17,691
Cash and cash equivalents at beginning of year	86,133	71,396	53,720
Exchange differences	15	13	(15)
Cash and cash equivalents at end of year	₩ 52,277	₩ 86,133	₩ 71,396

Information About Non-control_7

Information About Non-controlling Interests - Summary of Changes in Ownership Interest on the Equity Attributable to Owners (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure of subsidiaries [abstract]
Carrying amount of non-controlling interests acquired	₩ 3,022	₩ 19,272	₩ 14,702
Consideration paid to non-controlling interests	213,819	69,652	1,095
Effect of changes in equity (net amount)	₩ 216,841	₩ 88,924	₩ 15,797

Events After the Reporting Pe_3

Events After the Reporting Period - Summary of Public Bonds Issued After Reporting Period (Detail) ₩ in Millions	12 Months Ended
	Dec. 31, 2023 KRW (₩)
Disclosure of non-adjusting events after reporting period [line items]
Annual interest rates	0%
Gross carrying amount [member] | The 200-1st Public bond [member]
Disclosure of non-adjusting events after reporting period [line items]
Issued Date	Feb. 27, 2024
Annual interest rates	3.552%
Maturity	Feb. 27, 2026
Carrying amount	₩ 120,000
Gross carrying amount [member] | The 200-2nd Public bond [member]
Disclosure of non-adjusting events after reporting period [line items]
Issued Date	Feb. 27, 2024
Annual interest rates	3.608%
Maturity	Feb. 26, 2027
Carrying amount	₩ 200,000
Gross carrying amount [member] | The 200-3rd Public bond [member]
Disclosure of non-adjusting events after reporting period [line items]
Issued Date	Feb. 27, 2024
Annual interest rates	3.548%
Maturity	Feb. 27, 2029
Carrying amount	₩ 80,000

Events After the Reporting Pe_4

Events After the Reporting Period - Additional Information (Detail) - KRW (₩) ₩ in Millions			12 Months Ended
	Mar. 25, 2024	Feb. 07, 2024	Dec. 31, 2023	Dec. 31, 2021
Disclosure of non-adjusting events after reporting period [line items]
Purchase of treasury shares		₩ 27,100	₩ 300,243	₩ 190,105
Treasury Stocks Transactions [Member]
Disclosure of non-adjusting events after reporting period [line items]
Number of treasury stocks retired	695,775