KT (KT) 20-F 28 Apr 23 2022 FY Annual report (foreign) Financial data

Cover Page

Cover Page	12 Months Ended
	Dec. 31, 2022 shares
Document Information [Line Items]
Document Type	20-F
Amendment Flag	false
Document Period End Date	Dec. 31, 2022
Document Fiscal Year Focus	2022
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	256,042,678
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	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	Young-Jin Kim
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, 2022	Dec. 31, 2021
Current assets
Cash and cash equivalents	₩ 2,449,062	₩ 3,019,592
Trade and other receivables, net	6,098,072	5,087,490
Other financial assets	1,322,452	1,185,659
Current income tax assets	1,543	5,954
Inventories, net	717,673	514,145
Assets held for sale	0	1,187
Other current assets	2,101,212	2,044,323
Total current assets	12,690,014	11,858,350
Non-current assets
Trade and other receivables, net	1,491,046	1,091,326
Other financial assets	2,501,484	822,379
Property and equipment, net	14,772,179	14,464,886
Right-of-use assets	1,280,334	1,248,308
Investment properties, net	1,933,358	1,720,654
Intangible assets, net	3,129,833	3,447,333
Investments in associates and joint ventures	1,480,722	1,288,429
Deferred income tax assets	579,090	423,728
Net defined benefit assets	311,142	17,585
Other non-current assets	820,608	776,363
Total non-current assets	28,299,796	25,300,991
Total assets	40,989,810	37,159,341
Current liabilities
Trade and other payables	7,333,165	6,641,422
Borrowings	1,827,042	1,731,422
Other financial liabilities	8,791	72,807
Current income tax liabilities	232,382	266,430
Provisions	109,133	171,316
Deferred revenue	55,737	64,742
Other current liabilities	1,133,018	1,124,293
Total current liabilities	10,699,268	10,072,432
Non-current liabilities
Trade and other payables	1,064,099	1,338,781
Borrowings	8,179,643	6,706,281
Other financial liabilities	412,650	424,859
Defined benefit liabilities, net	51,654	197,883
Provisions	91,233	86,081
Deferred revenue	165,186	194,309
Deferred income tax liabilities	967,650	643,958
Other non-current liabilities	945,731	927,596
Total non-current liabilities	11,877,846	10,519,748
Total liabilities	22,577,114	20,592,180
Equity
Share capital	1,564,499	1,564,499
Share premium	1,440,258	1,440,258
Retained earnings	14,255,316	13,287,390
Accumulated other comprehensive income	(77,776)	117,469
Other components of equity	(572,152)	(1,433,080)
Equity attributable to owners of the Controlling Company	16,610,145	14,976,536
Non-controlling interest	1,802,551	1,590,625
Total equity	18,412,696	16,567,161
Total liabilities and equity	₩ 40,989,810	₩ 37,159,341

Consolidated Statements of Prof

Consolidated Statements of Profit or Loss - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Profit or loss [abstract]
Operating revenue	₩ 26,234,206	₩ 25,205,659	₩ 24,440,647
Revenue	25,638,855	24,898,005	24,099,394
Other income	595,351	307,654	341,253
Operating expenses	24,266,049	23,506,262	23,418,314
Operating profit	1,968,157	1,699,397	1,022,333
Finance income	690,428	726,283	498,614
Finance costs	(749,908)	(563,330)	(507,383)
Share of net profits of associates and joint ventures	(17,285)	116,061	18,041
Profit before income tax	1,891,392	1,978,411	1,031,605
Income tax expense	505,757	519,016	285,349
Profit for the year	1,385,635	1,459,395	746,256
Profit for the year attributable to:
Profit (loss) for the year attributable to Owners of the Controlling Company	1,260,470	1,356,878	700,889
Profit (loss) for the year attributable to Non-controlling interest	₩ 125,165	₩ 102,517	₩ 45,367
Earnings per share attributable to the equity holders of the Controlling Company during the year (in Korean won):
Basic earnings per share	₩ 5,200	₩ 5,759	₩ 2,858
Diluted earnings per share	₩ 5,196	₩ 5,747	₩ 2,858

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of comprehensive income [abstract]
Profit for the year	₩ 1,385,635	₩ 1,459,395	₩ 746,256
Other comprehensive income Items that will not be reclassified to profit or loss:
Remeasurements of the net defined benefit liability	181,429	55,822	(60,181)
Shares of remeasurement gain (loss) of associates and joint ventures	(332)	(1,596)	786
Gain (loss) on valuation of equity instruments at fair value through other comprehensive income	(141,944)	144,890	51,696
Other comprehensive income, Items that may be subsequently reclassified to profit or loss:
Loss on valuation of debt instruments at fair value through other comprehensive income	(16,630)	(15,110)	(9,699)
Valuation gain (loss) on cash flow hedge	64,091	141,855	(84,044)
Other comprehensive income (loss) from cash flow hedges reclassified to profit (loss)	(95,421)	(136,583)	111,431
Share of other comprehensive income (loss) from associates and joint ventures	(10,851)	(24,216)	15,932
Exchange differences on translation of foreign operations	17,464	505	(2,666)
Total other comprehensive income	(2,194)	165,567	23,255
Total comprehensive income for the year	1,383,441	1,624,962	769,511
Total comprehensive income for the year attributable to:
Owners of the Controlling Company	1,234,651	1,510,373	727,077
Non-controlling interest	₩ 148,790	₩ 114,589	₩ 42,434

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, 2019	₩ 15,140,684	₩ 1,564,499	₩ 1,440,258	₩ 11,590,916	₩ 194,934	₩ (1,170,083)	₩ 13,620,524	₩ 1,520,160
Comprehensive income
Profit for the year	746,256			700,889			700,889	45,367
Remeasurements of net defined benefit liabilities	(60,181)			(49,554)			(49,554)	(10,627)
Share of gain on remeasurements of associates and joint ventures	786			410			410	376
Share of other comprehensive loss of associates and joint ventures	15,932				14,701		14,701	1,231
Valuation gain on cash flow hedge	27,387				27,433		27,433	(46)
Gain (Loss) on valuation of financial instruments at fair value through other comprehensive income	41,997			184,215	(150,135)		34,080	7,917
Exchange differences on translation of foreign operations	(2,666)				(882)		(882)	(1,784)
Total comprehensive income for the year	769,511			835,960	(108,883)		727,077	42,434
Transactions with owners
Dividends paid by the Controlling Company	(269,766)			(269,766)			(269,766)
Dividends paid to non-controlling interest of subsidiaries	(40,802)							(40,802)
Changes in ownership interest in subsidiaries	29,825					11,628	11,628	18,197
Appropriations of loss on disposal of treasury stock				(1,690)		1,690
Acquisition of treasury stock	(110,097)					(110,097)	(110,097)
Disposal of treasury stock	33,213					33,213	33,213
Others	(1,135)					(1,135)	(1,135)	0
Subtotal	(358,762)			(271,456)		(64,701)	(336,157)	(22,605)
Ending 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 on remeasurements of associates and joint ventures	(1,596)			(1,559)			(1,559)	(37)
Share of other comprehensive loss of associates and joint ventures	(24,216)				(19,718)		(19,718)	(4,498)
Valuation gain 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)
Changes in scope of consolidation	(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 on remeasurements of associates and joint ventures	(332)			(189)			(189)	(143)
Share of other comprehensive loss of associates and joint ventures	(10,851)				(8,291)		(8,291)	(2,560)
Valuation gain 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)
Changes in scope of consolidation	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
Acquisition of treasury stock	763,081					763,081	763,081
Conversion of redeemable convertible preferred shares of subsidiaries to common shares	51,476							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

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities
Cash generated from operations	₩ 3,835,879	₩ 5,829,607	₩ 4,745,293
Interest paid	(263,520)	(257,809)	(254,852)
Interest received	307,091	272,061	259,836
Dividends received	68,827	74,441	19,623
Income tax paid	(351,212)	(356,466)	(30,073)
Net cash inflow from operating activities	3,597,065	5,561,834	4,739,827
Cash flows from investing activities
Collection of loans	44,287	54,934	63,435
Loans granted	(43,694)	(54,128)	(48,731)
Disposal of financial assets at fair value through profit or loss	1,298,621	609,849	528,655
Disposal of financial assets at amortized cost	1,046,115	690,457	528,746
Disposal of financial assets at fair value through other comprehensive income	97,932	244,994	351,065
Disposal of assets held-for-sale	4,600	0	83,241
Disposal of investments in associates and joint ventures	34,828	10,880	24
Acquisition of investments in associates and joint ventures	(280,988)	(487,828)	(273,411)
Disposal of property and equipment, and investment properties	178,063	174,413	49,832
Acquisition of property and equipment, and investment properties	(3,439,857)	(3,495,021)	(3,207,566)
Acquisition of financial assets at fair value through profit or loss	(1,317,175)	(753,907)	(521,142)
Acquisition of financial assets at amortized cost	(1,450,442)	(623,924)	(759,180)
Acquisition of financial assets at fair value through other comprehensive income	(449,504)	(131,674)	(14,092)
Disposal of intangible assets	20,088	11,624	13,362
Disposal of right-of-use assets	97	318	2,023
Discontinued operations	0	0	205
Acquisition of right-of-use assets	(2,090)	(4,261)	(5,824)
Acquisition of intangible assets	(545,190)	(752,181)	(511,094)
Decrease in cash due to changes in scope of consolidation	(41,088)	(671,359)	(41,018)
Increase in cash due to changes in scope of consolidation	6,754	39,340	0
Net cash outflow from investing activities	(4,838,643)	(5,137,474)	(3,761,470)
Cash flows from financing activities
Proceeds from borrowings and debentures	4,234,570	2,899,567	1,795,221
Repayments of borrowings and debentures	(2,843,249)	(1,999,173)	(1,627,354)
Settlement of derivative assets and liabilities, net	35,083	(1,496)	36,594
Cash inflow from consolidated equity transactions	125,066	67,693	0
Cash outflow from consolidated equity transactions	(28,848)	(11,001)	(1,192)
Cash inflow from other financing activities	2,193	2,556	35,854
Dividends paid to shareholders	(476,800)	(350,334)	(310,567)
Acquisition of treasury stock	0	(193,626)	(114,683)
Cash outflow from other financing activities	0	(60,901)	0
Decrease in leases liabilities	(378,684)	(394,567)	(447,784)
Decrease in other liabilities	0	0	(13,674)
Net cash outflow from financing activities	669,331	(41,282)	(647,585)
Effect of exchange rate change on cash and cash equivalents	1,717	1,890	(2,042)
Net increase (decrease) in cash and cash equivalents	(570,530)	384,968	328,730
Cash and cash equivalents at beginning of year	3,019,592	2,634,624	2,305,894
Cash and cash equivalents at end of year	₩ 2,449,062	₩ 3,019,592	₩ 2,634,624

General Information

General Information	12 Months Ended
	Dec. 31, 2022
Text block [abstract]
General Information	1. General Information The consolidated financial statements as of December 31, 2022 include the accounts of KT Corporation, which is the controlling company as defined under IFRS 10, Consolidated Financial Statements, and its 85 controlled subsidiaries as described in Note 1.2 (collectively referred to as the “Group”). 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 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), representing new shares and 20,813,311 government-owned shares, at the New York Stock Exchange. On July 2, 2001, the additional ADS representing 55,502,161 government-owned shares were issued at 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 at the end of the reporting period, the Korean government does not own any shares 1.2 Consolidated Subsidiaries The consolidated subsidiaries as at December 31, 2021 and 2022, are as follows: Controlling percentage 1 Subsidiary Type of business Location December 31, December 31, Closing month KT Linkus Co., Ltd. Public telephone maintenance Korea 92.4 % 92.4 % December KT Submarine Co., Ltd. 2,4 Submarine cable construction and maintenance Korea 39.3 % 32.9 % December KT Telecop Co., Ltd. Security service Korea 86.8 % 86.8 % December KT Alpha Co., Ltd. (KT Hitel Co., Ltd.) 4 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.2 Investment fund 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 month VP Inc. 4 Payment security service for credit card, others Korea 50.9 % 69.7 % 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. 4 Internet banking ASP and security solutions Korea 58.2 % 61.3 % December Smartro Co., Ltd. VAN (Value Added Network) business Korea 64.5 % 64.5 % December KTDS Co., Ltd. 4 System integration and maintenance Korea 95.5 % 95.6 % December KT M&S Co., Ltd. PCS distribution Korea 100.0 % 100.0 % December GENIE Music Corporation 3,4 Online music production and distribution Korea 36.2 % 36.0 % December KT MOS Bukbu Co., Ltd. 4 Telecommunication facility maintenance Korea 100.0 % 100.0 % December KT MOS Nambu Co., Ltd. 4 Telecommunication facility maintenance Korea 98.4 % 98.4 % December KT Skylife 4 Satellite TV Korea 50.3 % 50.2 % 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 (KT AMC Co., Ltd.) 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. 3,4 Solution provider and IPTV advertisement sales business Korea 44.0 % 44.0 % 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 KT-Michigan Global Content Fund Content investment business Korea 88.6 % 88.6 % December KTCS Corporation 2,4 Database and online information provider Korea 32.2 % 34.1 % December KTIS Corporation 2,4 Database and online information provider Korea 31.4 % 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 East Telecom LLC Wireless/fixed line internet business Uzbekistan 91.6 % 91.6 % December Controlling percentage 1 Subsidiary Type of business Location December 31, December 31, Closing month 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 100.0 % 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 80.0 % 79.8 % December HCN Co., Ltd. Cable television service Korea 100.0 % 100.0 % December Millie Seojae 3 Book contents service Korea 38.6 % 38.6 % 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 Epsilon M E A General Trading LLC 3 Local counter work United Arab Emirates 49.0 % 49.0 % 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 Alticast B.V. Software development and delivery Netherlands 100.0 % 100.0 % December 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 % December Hangang Real Estate Investment Trust No. 24 Investment fund Korea — 75.0 % December Controlling percentage 1 Subsidiary Type of business Location December 31, December 31, Closing month KT DX Vietnam Company Limited Software development Vietnam — 100.0 % December kt cloud Co., Ltd. Information telecommunication business Korea — 100.0 % December Pocheon Jeonggyori Development Co., Ltd. Residential building development Korea — 80.9 % December Alpha DX Solution Co., Ltd. Data communication service Korea — 100.0 % December PT CRANIUM ROYAL ADITAMA Software development Indonesia — 67.0 % December KT Primorye IDC LLC Data processing and associated service delivery Russia — 99.0 % December Juice Inc. 3 Online information provider/Software development and delivery Korea — 41.2 % December SPARK AND ASSOCIATES INC. Network service industry Korea — 100.0 % December 1 Sum of the ownership interests owned by the Controlling Company and subsidiaries. 2 Although the Controlling Company owns less than 50% ownership in this entity, this entity is consolidated as the Controlling Company can exercise the majority voting rights in its decision-making process at all times considering the historical voting pattern at the shareholders’ meetings. 3 Although the Controlling Company owns less than 50% ownership in this entity, this entity is consolidated as the Controlling Company holds the majority of voting right based on an agreement with other investors. 4 The number of subsidiaries’ treasury stock is deducted from the total number of shares when calculating the controlling percentage ownership. 1.3 Changes in Scope of Consolidation Subsidiaries newly Changes Location Name of Subsidiary Reason Included Russia KT RUS LLC Newly established Included Korea Hangang Real Estate Investment Trust No. 24 Newly established Included Vietnam KT DX Vietnam Company Limited Newly established Included Korea kt cloud Co., Ltd. Newly established Included Korea Pocheon Jeonggyori Development Co., Ltd. Newly established Included Korea Alpha DX Solution Co., Ltd. Split-off Included Indonesia PT CRANIUM ROYAL ADITAMA Transferred Included Russia KT Primorye IDC LLC Newly established Included Korea SPARK AND ASSOCIATES INC. Transferred Included Korea Juice Inc. Transferred Excluded Korea MEDIA GENIE Co., Ltd. Merged Excluded Korea kt seezn Co., Ltd. Merged Excluded UK 7D Digital Limited Liquidated Excluded Korea Whowho&Company Co., Ltd. Merged Summarized information for consolidated subsidiaries as at and for the years ended December 31, 2020, 2021 and 2022 is as follows: ( in December 31, 2020 Total assets Total Operating Profit (loss) for the year KT Powertel Co., Ltd. ￦ 119,694 ￦ 18,833 ￦ 65,897 ￦ 3,809 KT Linkus Co., Ltd. 58,372 54,022 84,519 (3,212 ) KT Submarine Co., Ltd. 116,813 14,032 110,201 1,197 KT Telecop Co., Ltd. 318,456 193,737 392,489 212 KT Alpha Co., Ltd. (KT Hitel Co., Ltd.) 288,949 92,599 350,231 2,080 KT Service Bukbu Inc. 60,825 56,554 217,451 (871 ) KT Service Nambu Inc. 58,182 51,460 264,776 (456 ) BC Card Co., Ltd. 1 3,084,398 1,778,751 3,387,640 39,455 H&C Network 1 269,651 61,365 322,690 2,413 Nasmedia Co., Ltd. 1 422,039 221,371 113,136 23,134 KTDS Co., Ltd. 1 183,297 133,129 499,990 10,635 KT M Hows Co., Ltd. 104,704 76,315 44,860 6,935 KT M&S Co., Ltd. 231,260 197,306 661,533 (485 ) GENIE Music Corporation 250,538 88,488 247,237 9,472 KT MOS Bukbu Co., Ltd. 32,167 26,070 67,975 1,473 KT MOS Nambu Co., Ltd. 33,765 24,947 71,259 1,639 KT Skylife Co., Ltd. 1 919,476 175,039 706,631 58,190 KT Estate Inc. 1 1,689,601 325,429 365,335 14,370 KTGDH Co., Ltd. (KTSB Data Service) 11,003 1,669 4,282 538 KT Sat Inc. 630,740 92,791 173,693 14,753 KT Sports Inc. 26,572 14,940 46,608 (2,516 ) KT Music Contents Fund No.1 4,844 1,525 243 84 KT Music Contents Fund No.2 15,021 285 169 (116 ) KT-Michigan Global Contents Fund 10,382 175 111 (1,420 ) Autopion Co., Ltd. 4,903 4,961 6,174 (2,459 ) KT M Mobile Inc. 129,011 27,281 163,472 (3,617 ) KT Investment Co., Ltd. 1 115,627 93,695 47,801 4,680 KTCS Corporation 1 384,919 215,175 933,006 11,323 KTIS Corporation 294,289 126,894 454,172 7,387 Next Connect PFV Inc. 394,268 37,271 26 (7,101 ) KT Japan Co., Ltd. 1 2,694 2,622 1,853 1 Korea Telecom China Co., Ltd. 381 21 618 (492 ) KT Dutch B.V. 1 29,585 10,109 26,782 6,061 KT AMERICA, INC 4,498 125 6,808 712 KT Rwanda Networks Ltd. 2 114,768 191,781 17,870 (34,610 ) KT Belgium 87,608 — (81 ) (81 ) KBTO sp.z o.o. 438 117 490 (2,823 ) AOS Ltd. 2 11,812 3,875 5,719 296 KT Hong Kong Telecommunications Co., Ltd. 6,159 2,800 16,386 1,308 KT Hopemate 3,720 2,787 5,239 (13 ) GE Premier 1st Corporate Restructuring Real Estate Investment Trust Co. 5,703 1,165 333 83 Storywiz Co., Ltd 21,594 10,065 19,209 (1,954 ) KT Engineering Co., Ltd. (KT ENGCORE Co., Ltd.) 138,220 102,963 346,040 (8,461 ) 1 These companies are the intermediate controlling companies of other subsidiaries and the above financial information is from their consolidated financial statements. 2 At the end of the reporting period, convertible preferred stock issued by subsidiaries is included in liabilities. (In millions of Korean won) December 31, 2021 Total assets Total 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 ( i December 31, 2022 Total assets Total 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. 1 516,945 275,730 153,211 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 At the end of the reporting period, convertible preferred stock issued by subsidiaries is included in liabilities. 3 Profit or loss is included from the date of acquisition of control to the end of the reporting period.

Significant Accounting Policies

Significant Accounting Policies	12 Months Ended
	Dec. 31, 2022
Text block [abstract]
Significant Accounting Policies	2. Significant Accounting Policies The principal accounting policies applied in the preparation of these consolidated financial statements are set out below. These policies have been consistently applied to all the years presented, unless otherwise stated. 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) – measured at fair value • Assets held-for-sale – measured at fair value less costs to sell • Defined benefit pension plans – plan assets measured at fair value The preparation of the consolidated financial statements requires the use of certain critical accounting estimates. Management needs judgement assumptions 2.2 Changes in Accounting Policy and Disclosures (1) New and amended standards adopted by the Group The Group has applied the following standards and amendments for the first time for their annual reporting period commencing January 1, 2022. - Amendments to IFRS 16 Leases – Concession on COVID-19—Related Rent Concessions Beyond June 30, 2021 The application of the practical expedient, a lessee may elect not to assess whether a rent concession occurring as a direct consequence of the COVID-19 pandemic is a lease modification, is extended to lease payments originally due on or before June 30, 2022. A lessee shall apply the practical expedient consistently to eligible contracts with similar characteristics and in similar circumstances. The amendments do not have a significant impact on the consolidated financial statements. - Amendments to IFRS 3 Business Combination – Reference to the Conceptual Framework The amendments update a reference of definition of assets and liabilities to be recognized in a business combination in revised Conceptual Framework for Financial Reporting. However, the amendments add an exception for the recognition of liabilities and contingent liabilities within the scope of IAS 37 Provisions, Contingent Liabilities and Contingent Assets Levies - Amendments to IAS 16 Property, Plant and Equipment – Proceeds Before Intended Use The amendments prohibit an entity from deducting from the cost of an item of property, plant and equipment any proceeds from selling items produced while the entity is preparing the asset for its intended use. Instead, the entity will recognize the proceeds from selling such items, and the costs of producing those items, in profit or loss. The amendments do not have a significant impact on the consolidated financial statements. - Amendments to IAS 37 Provisions, Contingent Liabilities and Contingent Assets – Onerous Contracts: Cost of Fulfilling a Contract The amendments clarify that the direct costs of fulfilling a contract include both the incremental costs of fulfilling the contract and an allocation of other costs directly related to fulfilling contracts when assessing whether the contract is onerous. The amendments do not have a significant impact on the consolidated financial statements. - Annual improvements of IFRS 2018-2020 Cycle should be applied for annual periods beginning on or after January 1, 2022, and earlier application is permitted. The Group does not expect that these amendments have a significant impact on the financial statements. • IFRS 1 First Time Adoption of Korean International Financial Reporting Standards • IFRS 9 Financial Instruments • IFRS 16 Leases • IAS 41 Agriculture (2) 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, 2022 reporting periods and have not been early adopted by the Group. - Amendments to IAS 1 Presentation of Financial Statements – Classification of Liabilities as Current or Non-Current The amendments clarify that liabilities are classified as either current or non-current, depending on the substantive rights that exist at the end of the reporting period. Classification is unaffected by the likelihood that an entity will exercise right to defer settlement of the liability or the expectations of management. Also, the settlement of liability include the transfer of the entity’s own equity instruments, however, it would be excluded if an option to settle them by the entity’s own equity instruments if compound financial instruments is met the definition of equity instruments and recognized separately from the liability. The amendments should be applied for annual periods beginning on or after January 1, 2024 - IAS 1 Presentation of Financial Statements – Disclosure of Accounting Policies The amendments to IAS 1 define and require entities to disclose their material accounting policies. The IASB amended IFRS Practice Statement 2 Disclosure of Accounting Policies to provide guidance on how to apply the concept of materiality to accounting policy disclosures. The amendments should be applied for annual periods beginning on or after January 1, 2023, and earlier application is permitted. The Group is in review for the impact of these amendments on the financial statements. - IAS 8 Accounting Policies, Changes in Accounting Estimates and Errors – Definition of Accounting Estimates The amendments define accounting estimates and clarify how to distinguish them from changes in accounting policies. The amendments should be applied for annual periods beginning on or after January 1, 2023, and earlier application is permitted. The Group does not expect that these amendments will have a significant impact on the financial statements. - IAS 12 Income Taxes – Deferred Tax Related to Assets and Liabilities Arising From a Single Transaction The amendments include an additional condition to the exemption to initial recognition of an asset or liability that a transaction does not give rise to equal taxable and deductible temporary differences at the time of the transaction. The amendments should be applied for annual periods beginning on or after January 1, 2023, and earlier application is permitted. The Group is in review for the impact of these amendments on the financial statements. - IAS 1 Presentation of Financial Statements – Disclosure of Gain or Loss on Valuation of Financial Liabilities Subject to Adjustment of Exercise Price If the entire or a part of financial instrument, whose exercise price is subject to change due to the issuer’s share price, is classified as a financial liability, the carrying amount of the financial liability and related gains and losses shall be disclosed. The amendments should be applied for annual periods beginning on or after January 1, 2023, and earlier application is permitted. The Group does not expect that these amendments wil l 2.3 Consolidation The Group has prepared the consolidated financial statements in accordance with IFRS 10 Consolidated Financial Statements (1) 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. (2) 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 Group. (3) 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. (4) 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. (5) 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 35). The chief operating decision-maker is responsible for allocating resources and assessing performance of the operating segments. 2.5 Foreign Currency Translation (1) 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. (2) 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 borrowings are presented in the statement of profit or loss, within finance costs. 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 , 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’ ‘ costs’ ‘ • 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’ ‘ 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. Dividends 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’ ‘ (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 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 38. 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 for trade receivables and Note 2.6 (c) for a description of the Group’s impairment policies. 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. 2.10 Non-Current Assets (or Disposal Group) Held-for-Sale Non-current assets (or disposal group) are classified as assets held for sale when their carrying amount will be recovered principally through a sale transaction rather than through continued use and when a sale is considered highly probable. The assets are measured at the lower amount between their carrying amount and the fair value less selling costs. 2.11 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 – 6 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. 2.12 Investment Property Real estate held for rental income or investment gains is classified as investment property and right-of-use asset. An investment property is measured initially at its cost. After recognition as an asset, investment property is carried at cost less accumulated depreciation and impairment losses. Investment property, except for land, is depreciated using the straight-line method over their useful lives from 5 to 40 years. 2.13 Intangible Assets (1) Goodwill Goodwill is measured as explained in Note 2.3 (1) and goodwill arising from acquisition of subsidiaries and business are 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 business 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. (2) 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 Useful Life Development costs 3 – 7 years Software 3 – 7 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. 2.14 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. 2.15 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 2.16 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. 2.17 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. 2.18 Financial Liabilities (1) 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’, ‘borrowings’ and ‘other financial liabilities’ in the statement of financial position. Borrowings are net of redemption draw-down occurs borrowings services 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. (2) 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. 2.19 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 2.20 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 conv

Critical Accounting Estimates a

Critical Accounting Estimates and Assumptions	12 Months Ended
	Dec. 31, 2022
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 assum ptio concerning 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 assess non-financial assets (including goodwill) for impairment (Note 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 30 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 3 8 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 18) 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, 2022
Text block [abstract]
Financial Instruments by Category	4. Financial Instruments by Category Financial instruments by category as at December 31, 202 1 an (in millions of Korean won) December 31, 2021 Financial assets Financial Financial Financial Derivatives used for Total Cash and cash equivalents ￦ 3,019,592 ￦ — ￦ — ￦ — ￦ 3,019,592 Trade and other receivables 5,687,103 — 491,713 — 6,178,816 Other financial assets 608,389 952,319 347,877 99,453 2,008,038 (in millions of Korean won) December 31, 2021 Financial liabilities Financial Financial profit and Derivatives Others Total Trade and other payables ￦ 7,980,203 ￦ — ￦ — ￦ — ￦ 7,980,203 Borrowings 8,437,703 — — — 8,437,703 Other financial liabilities 263,500 216,040 18,126 — 497,666 Lease liabilities — — — 1,159,369 1,159,369 (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 Financial profit and Derivatives used for Others Total Trade and other payables ￦ 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 Gains or losses arising from financial instruments by category for the years ended December 31, 2020, 2021 and 2022, are as follows: (in millions of Korean won) 2020 2021 2022 Financial assets at amortized cost Interest income 1 ￦ 55,742 ￦ 74,937 ￦ 144,505 Gain (loss) on foreign currency transactions 4 (19,244 ) 12,826 23,824 Gain (loss) on foreign currency translation (3,895 ) 2,911 (2,151 ) Gain (loss) on disposal 138 35 (81 ) Loss on valuation (140,474 ) (110,286 ) (132,102 ) Financial assets at fair value through profit or loss Interest income 1 6,548 3,673 6,008 Dividend income 5 4,379 21,499 4,600 Gain (loss) on valuation 6 59,044 64,659 (29,282 ) Gain (loss) on disposal (329 ) 29,974 2,347 Gain (loss) on foreign currency transactions 4 (38 ) — 1,100 Gain on foreign currency translation — 17,794 13,711 Financial assets at fair value through other comprehensive income Interest income 1 227,736 222,290 190,281 Dividend income 5 56 1,365 9,522 Loss on valuation — — (61 ) Loss on disposal (8,152 ) (22,712 ) (62,183 ) Other comprehensive income (loss) for the year 2 41,997 129,780 (158,574 ) Derivatives Gain on transactions 6,050 — 27,628 Loss (gain) on valuation 7 (2,707 ) 203,961 150,699 Other comprehensive income (loss) for the year 2 (2,373 ) 144,967 88,048 Reclassified to profit or loss from other comprehensive income (loss) for the year 2,3 3,645 (143,305 ) (110,616 ) Financial liabilities at fair value through profit or loss Gain on valuation 119 42,447 30,031 Gain on disposal 799 2,136 — Interest expense 1 — — (4,046 ) Gain (loss) on foreign currency transactions 4 — (2 ) 24 Derivatives used for hedging Gain (loss) on transactions 1,141 (6,208 ) (1,291 ) Loss on valuation (161,003 ) (7,206 ) (17,237 ) Other comprehensive loss for the year 2 (81,671 ) (3,112 ) (23,957 ) Reclassified to profit or loss from other comprehensive income for the year 2,3 107,786 6,722 15,195 Financial liabilities at amortized cost Interest expense 1 (220,945 ) (232,197 ) (275,302 ) Loss on foreign currency transactions 4 (10,717 ) (3,580 ) (34,574 ) Gain (loss) on foreign currency translation 141,849 (201,623 ) (168,577 ) Lease liabilities Interest expense 1 (44,091 ) (36,650 ) (41,469 ) Total ￦ (38,610 ) ￦ 215,095 ￦ (353,980 ) 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 ￦ million (2020: ￦20,854 million, 2021: ￦ ￦ million (2020: ￦1,456 million, 2021: ￦ 2 The amounts directly reflected in equity after adjustments of deferred income tax. 3 During the current and previous year, certain derivatives of the Group was 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 ￦ million (2020: transaction loss ￦19,687 million, 2021 foreign exchange gain and loss: ￦ 5 BC Card Co., Ltd., a subsidiary of the Group, recognized dividend income as operating revenue. Related dividend income recognized as operating revenue is ￦ million (2020: ￦2,059 million, 2021: ￦ 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 ￦ million (2020: valuation gain ￦40,822 million, 2021 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 and loss recognized as operating revenue and expense is ￦

Cash and Cash Equivalents

Cash and Cash Equivalents	12 Months Ended
	Dec. 31, 2022
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Cash and Cash Equivalents	5. Cash and Cash Equivalents Restricted cash and cash equivalents as at December 31, 2021 and 2022, are as follows: ( i December 31, December 31, Description Bank deposits ￦ ￦ Deposit restricted for government project and others Cash and cash equivalents in the consolidated statements

Trade and Other Receivables

Trade and Other Receivables	12 Months Ended
	Dec. 31, 2022
Text block [abstract]
Trade and Other Receivables	6. Trade and Other Receivables Trade and other receivables as at December 31, 2021 and 2022, are as follows: December 31, 2021 ( i Total Provision Present value Carrying amount Current assets Trade receivables ￦ 3,337,398 ￦ (346,869 ) ￦ (7,662 ) ￦ 2,982,867 Other receivables 2,201,781 (93,256 ) (3,902 ) 2,104,623 Total ￦ 5,539,179 ￦ (440,125 ) ￦ (11,564 ) ￦ 5,087,490 Non-current assets Trade receivables ￦ 612,654 ￦ (2,856 ) ￦ (17,351 ) ￦ 592,447 Other receivables 621,195 (108,131 ) (14,185 ) 498,879 Total ￦ 1,233,849 ￦ (110,987 ) ￦ (31,536 ) ￦ 1,091,326 December 31, 2022 ( i 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 The fair values of trade and other receivables with original maturities less than one year are Details of changes in provision for impairment for the years ended December 31, 2021 and 2022, are as follows: 2021 2022 (in millions of Korean won) Trade Other Trade Other Beginning balance ￦ 327,315 ￦ 204,604 ￦ 349,725 ￦ 201,387 Provision 82,329 23,015 64,522 65,941 Reversal — (508 ) — (850 ) Write-off/transfer (62,564 ) (25,900 ) (69,430 ) (49,904 ) Changes in consolidation scope 416 (300 ) (43 ) — Others 2,229 476 (1,036 ) 1,969 Ending balance ￦ 349,725 ￦ 201,387 ￦ 343,738 ￦ 218,543 Provisions for impairment on trade and other receivables are recognized as operating expenses and finance costs. Details of other receivables as at December 31, 2021 and 2022, are as follows: ( i December 31, 2021 December 31, 2022 Loans ￦ 101,718 ￦ 98,953 Receivables 1 1,872,467 2,668,545 Accrued income 5,933 32,218 Refundable deposits 349,360 339,450 Loans receivable 328,753 1,013,428 Finance lease receivables 85,370 105,690 Others 61,288 63,941 Less: Provision for impairment (201,387 ) (218,543 ) ￦ 2,603,502 ￦ 4,103,682 1 The settlement receivables of BC Card Co., Ltd. amounting to ￦ ￦ The maximum exposure of trade and other receivables to credit risk is the carrying amount of each class of receivables mentioned above as at December 31, 2022. A portion of the trade receivables is classified as financial assets at 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, 2022
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Other Financial Assets and Liabilities	7. Other Financial Assets and Liabilities Details of other financial assets and liabilities as at December 31, 2021 and 2022, are as follows: ( i December 31, 2021 December 31, 2022 Other financial assets Financial assets at amortized cost 1 ￦ 608,389 ￦ 1,060,058 Financial assets at fair value through profit or loss 1,2 952,319 1,064,856 Financial assets at fair value through other comprehensive income 1 347,877 1,508,192 Derivatives used for hedging 99,453 190,830 Less: Non-current (822,379 ) (2,501,484 ) Current ￦ 1,185,659 ￦ 1,322,452 Other financial liabilities Financial liabilities at amortized cost 3 ￦ 263,500 ￦ 246,606 Financial liabilities at fair value through profit or loss 216,040 141,280 Derivatives used for hedging 18,126 33,555 Less: Non-current (424,859 ) (412,650 ) Current ￦ 72,807 ￦ 8,791 1 As at December 31, 2022, the Group’s other financial assets amounting to ￦ ￦ 2 As at December 31, 2022, 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. (Note 20). Details of financial assets at fair value through profit or loss as at December 31, 2021 and 2022, are as follows: ( i December 31, 2021 December 31, 2022 Equity Instruments (Listed) ￦ 24,285 ￦ 26,647 Equity Instruments (Unlisted) 64,835 72,517 Debt securities 862,481 942,274 Derivatives held for trading 1 718 23,418 Total 952,319 1,064,856 Less: non-current (488,040 ) (609,887 ) Current ￦ 464,279 ￦ 454,969 1 During the year ended December 31, 2022, derivative assets amount to ￦ 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 at December 31, 2022. Details of financial assets at fair value through other comprehensive income as at December 31, 2021 and 2022, are as follows: ( i December 31, 2021 December 31, 2022 Equity Instruments (Listed) 1 ￦ 19,079 ￦ 1,006,476 Equity Instruments (Unlisted) 234,048 496,284 Debt securities 94,750 5,432 Total 347,877 1,508,192 Less: non-current (259,435 ) (1,508,192 ) Current ￦ 88,442 ￦ — 1 As at December 31, 2022, financial assets at fair value through other comprehensive income include shares of Shinhan Financial Group Co., Ltd., HYUNDAI MOBIS, and HYUNDAI MOTOR COMPANY. 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. During the period ended December 31, 2021, the Group sold all Mastercard Inc. shares. The fair value of the shares sold is ￦ ￦ ￦ Details of valuation of derivatives December 31, 2021 December 31, 2022 ( i Assets Liabilities Assets Liabilities Interest rate swap 1, 3 ￦ — ￦ 77 ￦ 4,236 ￦ — Currency swap 2, 3 99,453 18,049 186,594 33,555 Total 99,453 18,126 190,830 33,555 Less: non-current (67,889 ) (242 ) (147,141 ) (33,555 ) Current ￦ 31,564 ￦ 17,884 ￦ 43,689 ￦ — 1 The interest rate swap contract is to hedge the risk of variability in future fair value of the borrowings. 2 The currency swap contract is to hedge the risk of variability in cash flow from the borrowings. In applying the cash flow hedge accounting, the Group hedges its exposures to cash flow fluctuation until September 7, 2034. 3 The amount of derivatives subject to the second phase of interest rate indicator reform is assets ￦ ￦ The full fa ir The valuation gains and losses on the derivatives contracts for the years ended December 31, 2020, 2021 and 2022, are as follows: ( i 2020 2021 2022 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 ￦ — ￦ — ￦ (567 ) ￦ — ￦ — ￦ 1 ￦ 63 ￦ 490 ￦ 4,666 Currency swap — 161,661 (113,175 ) 203,961 7,206 191,569 154,611 20,723 79,781 Currency forwards — 2,049 — — — — — — 754 Total ￦ — ￦ 163,710 ￦ (113,742 ) ￦ 203,961 ￦ 7,206 ￦ 191,570 ￦ 154,674 ￦ 21,213 ￦ 85,201 1 The amounts directly reflected in equity are The ineffective portion recognized in profit or loss on the cash flow hedges are gains ￦ year ended December 31, 2022 ￦ ￦ The unsettled amount of derivative instruments for the years ended December 31, 2021 and 2022, are as follows: (i) Hedging instruments ( i and thousands of foreign currencies) 2021 Book value of hedging Changes in fair Currency Foreign Contract Assets Liabilities USD 2,016,350 ￦ 2,322,085 ￦ 93,948 ￦ 77 ￦ 186,130 JPY 30,000,000 326,751 — 18,049 (7,199 ) SGD 284,000 245,208 5,431 — 18,387 EUR 7,700 10,283 74 — 51 Total ￦ 2,904,327 ￦ 99,453 ￦ 18,126 ￦ 197,369 ( i 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 (ii) Hedged item ( i 2021 2022 Currency Book value Changes in fair Cash flow 1 Book value Changes in fair Cash flow 1 USD ￦ 2,401,943 ￦ (177,120 ) ￦ 21,826 ￦ 2,675,885 ￦ (170,010 ) ￦ (13,947 ) JPY 309,072 7,199 269 3,813 308 116 SGD 249,108 (15,570 ) 3,071 267,843 (18,720 ) 3,406 EUR 10,336 (53 ) 18 10,404 (121 ) 582 KRW — — — 101,035 (4,655 ) 4,385 Total ￦ 2,970,459 ￦ (185,544 ) ￦ 25,184 ￦ 3,058,980 ￦ (193,198 ) ￦ (5,458 ) 1 The amount is after the deferred tax directly added or subtracted to the capital is reflected. Details of financial liabilities at fair value through profit or loss as at December 31, 2021 and 2022, are as follows: ( i December 31, 2021 December 31, 2022 Derivatives held for trading 1,2,3 ￦ 216,040 ￦ 141,280 1 The Group signed a shareholder-to-share agreement with financial investors participating in the paid-in capital increase of K Bank Inc. for the year period ended December 31, 2021. According to the Drag-Along Right, if K Bank Inc. fails to be listed on the terms agreed upon for the date of completion of the acquisition, financial investors may exercise the Drag-Along right to the Group, and the Group may comply or exercise the right to claim for sale. If financial investors exercise the Drag-Along Right, the Group must exercise the right to claim for sale or guarantee the return on the terms agreed upon by financial investors. 2 The amount includes derivatives for convertible bonds issued by the Group (Note 16). 3 During the year ended December 31, 2022, derivative liabilities recognized amount to ￦ The valuation gain and loss on financial liabilities at fair value through profit or loss for the years ended December 31, 2020, 2021 and 2022, are as follows: 2020 2021 2022 ( i Valuation gain Valuation loss Valuation gain Valuation loss Valuation gain Valuation loss Derivatives held for trading ￦ 172 ￦ 53 ￦ 51,187 ￦ 8,741 ￦ 24,683 ￦ 1,800

Inventories

Inventories	12 Months Ended
	Dec. 31, 2022
Text block [abstract]
Inventories	8. Inventories Inventories as at December 31, 2021 and 2022, are as follows: December 31, 2021 December 31, 2022 ( i Acquisition Valuation Book amount Acquisition cost Valuation Allowance Book amount Merchandise ￦ 601,360 ￦ (120,304 ) ￦ 481,056 ￦ 768,748 ￦ (96,010 ) ￦ 672,738 Others 33,089 — 33,089 44,935 — 44,935 Total ￦ 634,449 ￦ (120,304 ) ￦ 514,145 ￦ 813,683 ￦ (96,010 ) ￦ 717,673 Cost of inventories recognized as expenses for year ended December 31, 2022, amounts to ￦ ￦ ￦ ￦ ￦ ￦

Other Assets and Liabilities

Other Assets and Liabilities	12 Months Ended
	Dec. 31, 2022
Text block [abstract]
Other Assets and Liabilities	9. Other Assets and Liabilities Other assets and liabilities as at December 31, 2021 and 2022, are as follows: ( i December 31, 2021 December 31, 2022 Other assets Advance payments ￦ 151,266 ￦ 181,150 Prepaid expenses 100,697 107,775 Contract cost 1,801,244 1,817,678 Contract assets 745,085 802,253 Others 22,212 12,964 Less: Non-current (776,363 ) (820,608 ) Current ￦ 2,044,323 ￦ 2,101,212 Other liabilities Advances received 1 ￦ 372,375 ￦ 387,986 Withholdings 135,160 155,017 Unearned revenue 1 35,577 46,493 Lease liabilities 1,159,369 1,172,038 Contract liabilities 323,651 284,107 Others 25,757 33,108 Less: Non-current (927,596 ) (945,731 ) Current ￦ 1,124,293 ￦ 1,133,018 1 The amounts include adjustments arising from adoption of IFRS 15 R evenue from Contracts with Customers

Assets Held for Sale

Assets Held for Sale	12 Months Ended
	Dec. 31, 2022
Text block [abstract]
Assets Held for Sale	10. Assets Held for Sale With the decision to sell certain properties and other assets during the year ended December 31, 2021, the Group has classified ￦ ￦ disposed during the period ended December 31, 2022, and the Group recognized gain on disposal of ￦

Property and Equipment

Property and Equipment	12 Months Ended
	Dec. 31, 2022
Text block [abstract]
Property and Equipment	11. Property and Equipment Changes in property and equipment for the years ended December 31, 2021 and 2022, are as follows: 2021 ( i Land Buildings Machinery Others Construction- Total Acquisition cost ￦ 1,334,759 ￦ 4,402,691 ￦ 39,182,265 ￦ 1,619,822 ￦ 1,046,795 ￦ 47,586,332 Less: Accumulated depreciation (including accumulated impairment loss and others) (132 ) (2,094,669 ) (29,867,282 ) (1,414,170 ) (3,960 ) (33,380,213 ) Beginning, net 1,334,627 2,308,022 9,314,983 205,652 1,042,835 14,206,119 Acquisition and capital expenditure 60,817 36,446 28,159 55,336 2,947,335 3,128,093 Disposal and termination (45,318 ) (11,827 ) (76,676 ) (6,868 ) (64 ) (140,753 ) Depreciation — (145,954 ) (2,368,679 ) (81,507 ) — (2,596,140 ) Impairment — — (2,075 ) (40 ) — (2,115 ) Transfer in (out) 4,608 415,771 2,340,948 27,051 (2,872,257 ) (83,879 ) Transfer from (to) investment properties (59,848 ) (73,096 ) — — — (132,944 ) Changes in scope of consolidation 20,911 6,355 67,925 15,583 497 111,271 Others — (18,295 ) 11,986 6,031 (24,488 ) (24,766 ) Ending, net ￦ 1,315,797 ￦ 2,517,422 ￦ 9,316,571 ￦ 221,238 ￦ 1,093,858 ￦ 14,464,886 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 ) 2022 ( i 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) 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 ) Changes in scope of consolidation — — (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 ) Details of property and equipment provided as collateral as at December 31, 2021 and 2022, are as follows: (in millions of Korean won) December 31, 2021 Carrying Secured Related line Related Secured party Land and Buildings ￦ 11,320 ￦ 15,412 Borrowings ￦ 3,272 Industrial Korea ( i December 31, 2022 Carrying Secured Related line Related Secured party Land and Buildings ￦ 11,353 ￦ 15,774 Borrowings ￦ 3,228 Industrial Korea The borrowing costs capitalized for qualifying assets amount to ￦ ￦ ￦

Investment Properties

Investment Properties	12 Months Ended
	Dec. 31, 2022
Text block [abstract]
Investment Properties	12. Investment Properties Changes in investment properties for the years ended December 31, 2021 and 2022, are as follows: ( i 2021 Land Buildings Construction- Total Acquisition cost ￦ 539,903 ￦ 1,341,326 ￦ 46,547 ￦ 1,927,776 Less: Accumulated depreciation (1,568 ) (557,755 ) — (559,323 ) Beginning, net ￦ 538,335 ￦ 783,571 ￦ 46,547 ￦ 1,368,453 Acquisition 171,872 42,151 56,351 270,374 Disposal and termination (17,133 ) (4,862 ) — (21,995 ) Depreciation — (47,754 ) — (47,754 ) Transfer from(to) property and equipment 59,848 73,096 — 132,944 Changes in scope of consolidation 5,262 1,779 — 7,041 Transfer and others 55,579 (7,891 ) (36,097 ) 11,591 Ending, net ￦ 813,763 ￦ 840,090 ￦ 66,801 ￦ 1,720,654 Acquisition cost ￦ 815,331 ￦ 1,424,066 ￦ 66,801 ￦ 2,306,198 Less: Accumulated depreciation (1,568 ) (583,976 ) — (585,544 ) ( i 2022 Land Buildings Construction- 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 Changes in consolidation scope 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 ) The fair value of investment properties is ￦ ￦ Rental income from investment properties is ￦ in 2022 ￦ expense As at December 31, 2022, 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 ￦ ￦ ￦ ￦ Details of investment properties provided as collateral as at December 31, 2021 and 2022, are as follows: ( i December 31, 2021 Carrying Secured Related Related Land and Buildings ￦ 828,103 ￦ 72,910 Deposits ￦ 63,012 Land and Buildings ￦ 2,883 ￦ 3,688 Borrowings ￦ 2,728 ( i December 31, 2022 Carrying Secured Related Related Land and Buildings ￦ 460,166 ￦ 61,733 Deposits ￦ 52,662 Land and Buildings ￦ 2,546 ￦ 3,326 Borrowings ￦ 2,772

Intangible Assets

Intangible Assets	12 Months Ended
	Dec. 31, 2022
Text block [abstract]
Intangible Assets	13. Intangible Assets Changes in intangible assets for the years ended December 31, 2021 and 2022, are as follows: 2021 ( i Goodwill Development Software Frequency usage rights Others 1 Total Acquisition cost ￦ 536,093 ￦ 1,767,422 ￦ 1,053,980 ￦ 3,373,095 ￦ 1,167,735 ￦ 7,898,325 Less: Accumulated amortization (including accumulated impairment loss and others) (306,008 ) (1,486,423 ) (907,980 ) (2,212,432 ) (824,224 ) (5,737,067 ) Beginning, net ￦ 230,085 ￦ 280,999 ￦ 146,000 ￦ 1,160,663 ￦ 343,511 ￦ 2,161,258 Acquisition and capital expenditure 467,394 38,113 36,437 1,065,096 113,579 1,720,619 Disposal and termination — (7,893 ) (506 ) (276 ) (5,108 ) (13,783 ) Amortization — (92,230 ) (52,547 ) (386,741 ) (73,226 ) (604,744 ) Impairment — (216 ) (316 ) — (3,216 ) (3,748 ) Changes in scope of consolidation (607 ) 8,640 (4,548 ) — 152,768 156,253 Others — 960 14,905 389 15,224 31,478 Ending, net 696,872 228,373 139,425 1,839,131 543,532 3,447,333 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 ) 2022 ( i 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 ) Changes in scope of consolidation — (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 ) The carrying amount of membership rights with an indefinite useful life not subject to amortization, except for goodwill, is ￦ ￦ Goodwill is allocated to the Group’s cash-generating unit which is identified ( i Cash generating Unit Amount Mobile services 1,9 ￦ 65,057 BC Card Co., Ltd. 2 41,234 HCN Co., Ltd. 3 228,674 GENIE Music Corporation 4 50,214 MILLIE Co., Ltd. 5 54,725 PlayD Co., Ltd. 6 42,745 KT Telecop Co., Ltd. 7 15,418 Epsilon Global Communications Pte. Ltd. 8 160,033 KT MOS Bukbu Co., Ltd and others 50,123 Total ￦ 708,223 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 1.13% 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 8.48% 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 mobile business for the years ended December 31, 2020, 2021 and 2022. 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 1.57% 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 5.32% 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, 2020, 2021 and 2022. 3 The recoverable amounts ive ive In addition, management estimated the cash flow based on past performance and its expectation of market growth, and the discount rates 10.14% used reflected specific risks relating to the relevant CGU. As a result of the impairment test, HCN’s recoverable amount was KRW 228,674 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 f ive ive 5 The recoverable amounts of MILLIE Co., Ltd. Co., Ltd. 6 The recoverable amounts of PlayD Co., Ltd. are calculated based on value-in use calculations. These calculations use discounted cash flow projections for the next f ive ive 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 3.05% 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 10.23% 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, 2020, 2021 and 2022. 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 12.10% 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 9.74% 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 Epsilon Global Communications Pte. Ltd. for the years ended December 31, 2022. 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 1.13% ~ 4.31% 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 8.48%. Accordingly, the Group did not recognize an impairment loss on ICT reporting segment for the years ended December 31, 2020, 2021 and 2022.

Investments in Associates and J

Investments in Associates and Joint Ventures	12 Months Ended
	Dec. 31, 2022
Text block [abstract]
Investments in Associates and Joint Ventures	14. Investments in Associates and Joint Ventures Details of associates that are material to the Group as at December 31, 2021 and 2022, are as follows: Percentage of ownership (%) Location Closing December 31, 2021 December 31, 2022 KIF Investment Fund 33.3 % 33.3 % Korea December K Bank Inc. 33.7 % 33.7 % Korea December Hyundai Robotics Co., Ltd. 1 10.0 % 10.0 % Korea December Megazone Cloud Corporation 1 — 6.8 % Korea December IGIS No. 468-1 General Private Real Estate Investment Company — 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 LLC No. 35.3 % 35.3 % Korea December 1 As at December 31, 2022, although the Group has less than 20% ownership in ordinary share, this entity is included in investments in associates as the Group has significant influence in determining the operational and financial policies. Changes in investments in associates and joint ventures for the years ended December 31, 2021 and 2022, are as follows: 2021 ( i Beginning Acquisition (Disposal) Share of net profit 1 Others Ending KIF Investment Fund ￦ 170,155 ￦ — ￦ 16,702 ￦ (7,922 ) ￦ 178,935 KT-IBKC Future Investment Fund 1 16,190 (5,700 ) 1,591 — 12,081 K Bank Inc. 2 208,272 424,957 5,809 192,699 831,737 Hyundai Robotics Co., Ltd. 50,936 — (2,373 ) 162 48,725 K-REALTY CR REITs No.1 31,088 — 75,676 (39,106 ) 67,658 Others 1 81,240 57,691 18,769 (8,407 ) 149,293 ￦ 557,881 ￦ 476,948 ￦ 116,174 ￦ 137,426 ￦ 1,288,429 2022 ( i Beginning Acquisition (Disposal) Share of net profit 1 Others Ending KIF Investment Fund ￦ 178,935 ￦ — ￦ 2,502 ￦ (10,458 ) ￦ 170,979 K Bank Inc. 831,737 — 29,010 (7,991 ) 852,756 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 . 17,084 — (464 ) — 16,620 Others 1 189,810 100,040 (24,688 ) (56,078 ) 209,084 ￦ 1,288,429 ￦ 255,041 ￦ (16,821 ) ￦ (45,927) ￦ 1,480,722 1 KT investment Co., Ltd., a subsidiary of the Group, recognized its share in net profit from associates and joint ventures as operating revenue and expense. These include its share in net gain from associates and joint ventures of ￦ ￦ ￦ 2 During the year ended December 31, 2021, the amount increased due to the settlement of derivative liabilities, resulting from a shareholder agreement among financial investors participating in the paid-in capital increase of K-Bank Inc. Summarized financial information of associates and joint ventures as at and for the years ended December 31, 2021 and 2022, is as follows: ( i December 31, 2021 Current Non-current assets Current Non-current liabilities KIF Investment Fund ￦ 117,172 ￦ 419,632 ￦ — ￦ — KT-IBKC Future Investment Fund 1 24,163 — — — K Bank Inc. 13,263,658 70,362 11,594,316 2,467 Hyundai Robotics Co., Ltd. 308,776 120,221 91,637 57,899 K-REALTY CR REITs No.1 208,825 — — — (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 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 — ( i 2021 Operating Profit (loss) Other Total Dividends KIF Investment Fund ￦ 58,791 ￦ 50,107 ￦ (6,847 ) ￦ 43,260 ￦ 5,640 KT-IBKC Future Investment Fund 1 5,912 3,184 — 3,184 — K Bank Inc. 287,775 21,728 (28,211 ) (6,483 ) — Hyundai Robotics Co., Ltd. 189,255 (23,730 ) 1,977 (21,753 ) — K-REALTY CR REITs No.1 425,363 180,437 — 180,437 40,142 ( i 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 — 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 . — (474 ) — (474 ) — Details of a reconciliation of the summarized financial information to the carrying amount of interests in the associates and joint ventures that are material to the Group as at and for the years end December 31, 2021 and 2022, are as follows: ( i 2021 Net assets (a) Percentage of (b) Share in net (c)=(a)x(b) Intercompany Book amount (c)+(d) KIF Investment Fund ￦ 536,804 33.33 % ￦ 178,935 ￦ — ￦ 178,935 KT-IBKC Future Investment Fund 1 24,163 50.00 % 12,081 — 12,081 K Bank Inc. 1,737,237 33.72 % 585,837 245,900 831,737 Hyundai Robotics Co., Ltd. 279,461 10.00 % 27,946 20,779 48,725 K-REALTY CR REITs No.1 208,825 30.05 % 62,752 4,906 67,658 (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 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 . 46,120 35.29 % 16,278 342 16,620 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, 2022
Text block [abstract]
Trade and Other Payables	15. Trade and Other Payables Details of trade and other payables as at December 31, 2021 and 2022 ( i December 31, December 31, Current liabilities Trade payables ￦ 1,537,148 ￦ 1,150,515 Other payables 5,104,274 6,182,650 Total ￦ 6,641,422 ￦ 7,333,165 Non-current liabilities Other payables ￦ 1,338,781 ￦ 1,064,099 Total ￦ 1,338,781 ￦ 1,064,099 Details of other payables as at December 31, 2021 and 2022 are as follows: ( i December 31, December 31, Non-trade payables 1 ￦ 4,378,445 ￦ 4,981,300 Accrued expenses 1,037,616 1,234,023 Operating deposits 814,613 818,603 Others 212,381 212,823 Less: non-current (1,338,781 ) (1,064,099 ) Current ￦ 5,104,274 ￦ 6,182,650 1 Settlement payables of BC Card Co., Ltd., a subsidiary of the Group, of ￦ related ￦ million

Borrowings

Borrowings	12 Months Ended
	Dec. 31, 2022
Text block [abstract]
Borrowings	16. Borrowings Details of borrowings as at December 31, 2021 and 2022, are as follows: Debentures ( i December 31, 2021 December 31, 2022 Type Maturity Annual interest Foreign Korean Foreign Korean MTNP notes 1 Sep. 7, 2034 6.500% USD 100,000 ￦ 118,550 USD 100,000 ￦ 126,730 MTNP notes Jul. 18, 2026 2.500% USD 400,000 474,200 USD 400,000 506,920 MTNP notes Aug. 7, 2022 — USD 400,000 474,200 — — FR notes 2 Aug. 23, 2023 LIBOR(3M)+0.900% USD 100,000 118,550 USD 100,000 126,730 MTNP notes Jul. 19, 2022 — JPY 29,600,000 304,951 — — MTNP notes Jul. 19, 2024 0.330% JPY 400,000 4,121 JPY 400,000 3,813 MTNP notes Sep. 1, 2025 1.000% USD 400,000 474,200 USD 400,000 506,920 FR notes 2 Nov. 1, 2024 LIBOR(3M)+0.980% USD 350,000 414,925 USD 350,000 443,555 FR notes 2 Jun. 19, 2023 SOR(6M)+0.500% SGD 284,000 249,108 SGD 284,000 267,843 MTNP notes Jan. 21, 2027 1.375% USD 300,000 355,650 USD 300,000 380,190 MTNP notes Aug. 08, 2025 4.000% — — USD 500,000 633,650 The 183-3rd Public bond Dec. 22, 2031 4.270% — 160,000 — 160,000 The 184-2nd Public bond Apr. 10, 2023 2.950% — 190,000 — 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 2.749% — 150,000 — 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 191-1st Public bond Jan. 14, 2022 — — 220,000 — — 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 192-1st Public bond Oct. 11, 2022 — — 340,000 — — 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 1.174 % — 150,000 — 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 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 The 196-2nd Public bond Jan. 27, 2027 2.637 % — — — 100,000 The 196-3rd Public bond Jan. 27, 2032 2.741 % — — — 30,000 (in millions of Korean won and thousands of foreign currencies) December 31, 2021 December 31, 2022 Type Maturity Annual interest Foreign Korean Foreign Korean The 197-1st Public bond Jun. 27, 2025 4.191% — — — 280,000 The 197-2nd Public bond Jun. 29, 2027 4.188% — — — 120,000 The 18-1st Won-denominated unsecured bond Jul. 2, 2024 1.844% — 100,000 — 100,000 The 18-2nd Won-denominated unsecured bond Jul. 2, 2026 2.224% — 50,000 — 50,000 The 148th Won-denominated unsecured bond Jun. 23, 2023 1.513% — 100,000 — 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 1.154% — 20,000 — 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 1.191% — 10,000 — 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 2.310% — 30,000 — 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 The 155-2nd Won-denominated unsecured bond Sep. 2, 2024 2.745% — — — 20,000 The 155-3rd Won-denominated unsecured bond Feb. 28, 2025 2.880% — — — 20,000 The 156-1st Won-denominated unsecured bond 3 Mar. 25, 2025 5Y CMS+0.404 % — — — 60,000 The 156-2nd Won-denominated unsecured bond 3 Mar. 25, 2032 10Y CMS+0.965 % — — — 40,000 The 157-1st Won-denominated unsecured bond Apr. 28, 2023 2.588 % — — — 30,000 The 157-2nd Won-denominated unsecured bond Oct. 27, 2023 3.024 % — — — 30,000 The 158th Won-denominated unsecured bond Jan. 27, 2025 4.421 % — — — 50,000 The 159-1st Won-denominated unsecured bond Aug. 09, 2024 4.267 % — — — 30,000 The 159-2nd Won-denominated unsecured bond Aug. 11, 2027 4.505 % — — — 30,000 The 160-1st Won-denominated unsecured bond Jun. 14, 2024 5.615 % — — — 20,000 The 160-2nd Won-denominated unsecured bond Dec. 13, 2024 5.667 % — — — 20,000 (in millions of Korean won and thousands of foreign currencies) December 31, 2021 December 31, 2022 Type Maturity Annual interest Foreign Korean Foreign Korean The 160-3rd Won-denominated unsecured bond Dec. 12, 2025 5.769% — — — 30,000 The 161-1st Won-denominated unsecured bond Jun. 21, 2024 5.527% — — — 10,000 The 161-2nd Won-denominated unsecured bond Dec. 20, 2024 5.557% — — — 20,000 The 161-3rd Won-denominated unsecured bond Jun. 20, 2025 5.594% — — — 30,000 The 161-4th Won-denominated unsecured bond Dec. 22, 2025 5.615% — — — 10,000 The 162-1st Won-denominated unsecured bond Dec. 27, 2023 5.066% — — — 50,000 The 162-2nd Won-denominated unsecured bond Jan. 26, 2024 5.069% — — — 40,000 The 162-3rd Won-denominated unsecured bond Apr. 26, 2024 5.080% — — — 10,000 Subtotal 7,558,455 8,406,351 Less: Current portion (1,337,714 ) (1,154,101 ) Discount on bonds (22,093 ) (23,728 ) Total ￦ 6,198,648 ￦ 7,228,522 1 As at December 31, 2022, the Group has outstanding notes in the amount of USD 2,000 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 100 million. However, the MTNP has been terminated since 2007. 2 The Libor (3M) and SOR (6M) is approximately 4.767% and 4.429%, respectively as at December 31, 2022. The loan has not been converted to an alternative indicator interest rate, and the Group is assessing the impact of switching to an alternative indicator interest rate as of December 31, 2022. 2 The CMS (5Y) and CMS (10Y) is approximately 3.588% and 3.490%, respectively as at December 31, 2022. The loan has not been converted to an alternative indicator interest rate. 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 4 — 30,000 Redemption premium 2,267 4,565 Bond discount issuance (3,825 ) (7,206 ) Subtotal 6,442 35,359 Current portion — — Total ￦ 6,442 ￦ 35,359 1 Common shares of Storywiz are subject to conversion (appraisal period 2 Nominal interest rate and maturity yield is approximately 0% and 5%, respectively, and will be settled on maturity. 3 Common shares of KT cloud are subject to conversion (appraisal period: July 27, 2022~December 25, 2024). 4 Nominal interest rate and maturity yield is approximately 0% and 3%, respectively, and the sum of principal and interest will be settled on maturity. Short-term borrowings (in millions of Korean won) December 31, 2021 December 31, 2022 Type Financial institution Annual interest rates Foreign Korean Foreign Korean Operational Shinhan Bank 1 3.840%~6.440% — ￦ 4,500 — ￦ 105,000 CD(91D)+1.750% — — — 30,000 Woori Bank 1,2 KORIBOR(3M)+1.960 — 20,000 — 20,000 CD(91D)+1.430 — — — 30,000 Korea Development Bank 4.630 6.200 — 16,000 — 27,201 Industrial Bank of Korea 4.880 — 6,000 — 6,000 Hana Bank 1 CD(91D)-0.020 — 5,000 — 5,000 KB SECURITIES 5.904 — 71,000 — 94,822 Shinhan Investment — — 73,000 — — KIWOOM Securities — — 63,000 — — NH INVESTMENT & SECURITIES 5.070 — 53,000 — 20,000 Korea Investment & Securities — — 10,000 — — HSBC 5.090 USD 14,700 17,427 USD 18,500 23,451 NongHyup Bank 2 4.690 4.940 — — — 9,000 COFIX(6M)+1.780 — — — 15,000 IBK Securities 5.070 — — — 20,000 Hi Investment & Securities and others 3.710 — — — 99,524 Total ￦ 338,927 ￦ 504,998 1 CD (91D) is approximately 3.980% as at December 31, 2022. 2 KORIBOR (3M) and COFIX (6M) are approximately 4.040% and 4.340%, respectively, as at December 31, 2022. Long-term borrowings (in millions of Korean won and thousands of foreign currencies) December 31, 2021 December 31, 2022 Financial institution Type Annual interest rates Foreign currency Korean Foreign Korean won Export-Import Bank of Korea Inter-Korean Cooperation Fund 1 1.000% — ￦ 2,467 — ￦ 1,974 CA-CIB Long-term CP 1.260%~3.380% — 100,000 — 200,000 JPM Long-term CP 2.700 — — — 100,000 DBS Long-term CP 4.109% — — — 100,000 Shinhan Bank General loans — USD 25,918 30,726 — — General loans 2 LIBOR(3M)+1.650 USD 8,910 10,563 USD 8,910 11,292 General loans 2 LIBOR(3M)+1.847 USD 13,000 15,412 USD 13,000 16,475 General loans 2 LIBOR(3M)+2.130 USD 25,000 29,638 USD 25,000 31,683 General loans 1.900%~3.230 USD 31,472 37,345 USD 31,472 39,855 General loans 3 4.490 — — — 62,398 General loans 2 Term — — USD 21,127 26,774 Woori Bank General loans 2 EURIBOR(3M)+0.900% EUR 7,700 10,336 EUR 7,700 10,404 General loans 3.320% — 15,000 — 15,000 PF loans 2.000%~3.470% — 23,614 — 40,682 Hi Investment & Securities and others CP 2.302%~3.622% — 88,510 — 182,569 Korea Development Bank General loans 3.000%~3.610% — 39,000 — 38,000 NH Jayang PF loans 2 CD(91D)+1.150 — 46,267 — 59,066 Kyobo Life Insurance PF loans 2 CD(91D)+1.150%~3.450% — 41,640 — 66,390 Standard Chartered Bank Korea PF loans 2 CD(91D)+1.150%~3.450% — 27,760 — 44,260 Samsung Life Insurance PF loans 1.860%~4.160% — 23,133 — 36,883 Kookmin Bank and others Facility loans — USD 9,771 11,584 — — Subtotal 552,995 1,083,705 Less: Current portion (51,803 ) (167,943 ) ￦ 501,192 ￦ 915,762 1 The above Inter-Korean Cooperation Fund is repayable in installments over 13 years after a seven-year grace period. 2 LIBOR (3M), EURIBOR (3M), Term SOFR (3M) and CD (91D) are approximately 4.767%, 2.132%, 4.587% and 3.980%, respectively, as at December 31, 2022. 3 The general loans are repayable in installments over 4 years after a three-year grace period. Repayment schedule of the Group’s debentures and (in millions of Korean won) Bonds Borrowings Total In local In foreign Sub- total In local In foreign Sub- total Jan. 1, 2023~Dec. 31, 2023 ￦ 760,000 ￦ 394,573 ￦ 1,154,573 ￦ 590,040 ￦ 82,900 ￦ 672,940 ￦ 1,827,513 Jan. 1, 2024~Dec. 31, 2024 1,380,000 447,368 1,827,368 455,899 51,687 507,586 2,334,954 Jan. 1, 2025~Dec. 31, 2025 1,138,000 1,140,570 2,278,570 182,432 — 182,432 2,461,002 Jan. 1, 2026~Dec. 31, 2026 420,000 506,920 926,920 111,817 — 111,817 1,038,737 After Jan. 1, 2027 1,750,000 506,920 2,256,920 88,581 25,346 113,927 2,370,847 Total ￦ 5,448,000 ￦ 2,996,351 ￦ 8,444,351 ￦ 1,428,769 ￦ 159,933 ￦ 1,588,702 ￦ 10,033,053

Provisions

Provisions	12 Months Ended
	Dec. 31, 2022
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Provisions	17. Provisions Changes in provisions for the years ended December 31, 2021 and 2022, are as follows: 2021 ( i Litigation Restoration cost Others Total Beginning balance ￦ 76,500 ￦ 105,767 ￦ 69,925 ￦ 252,192 Increase (Transfer) 6,288 6,772 19,835 32,895 Usage (2,599 ) (2,776 ) (1,926 ) (7,301 ) Reversal (24 ) (3,685 ) (19,188 ) (22,897 ) Scope change — 1,086 1,228 2,314 Others — 194 — 194 Ending balance ￦ 80,165 ￦ 107,358 ￦ 69,874 ￦ 257,397 Current ￦ 79,947 ￦ 26,026 ￦ 65,343 ￦ 171,316 Non-current 218 81,332 4,531 86,081 2022 ( i 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

Net Defined Benefit Liabilities

Net Defined Benefit Liabilities	12 Months Ended
	Dec. 31, 2022
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Net Defined Benefit Liabilities	18. Net Defined Benefit Liabilities The amounts recognized in the statements of financial position as at December 31, 2021 and 2022, are determined as follows: ( i December 31, 2021 December 31, 2022 Present value of defined benefit obligations ￦ 2,494,930 ￦ 2,218,655 Fair value of plan assets (2,314,632 ) (2,478,143 ) Liabilities ￦ 197,883 ￦ 51,654 Assets ￦ 17,585 ￦ 311,142 Changes in the defined benefit obligations for the years ended December 31, 2021 and 2022, are as follows: ( i 2021 2022 Beginning ￦ 2,556,712 ￦ 2,494,930 Current service cost 249,125 238,068 Interest expense 44,905 59,041 Benefit paid (310,766 ) (316,047 ) Changes due to settlements of plan & Past Service Cost (681 ) (701 ) Remeasurements: Actuarial gains and losses arising from changes in demographic assumptions (8,375 ) (13,048 ) Actuarial gains and losses arising from changes in financial assumptions (61,002 ) (323,501 ) Actuarial gains and losses arising from experience adjustments (5,271 ) 80,845 Changes in scope of consolidation , etc. 30,283 (932 ) Ending ￦ 2,494,930 ￦ 2,218,655 Changes in the fair value of plan assets for the years ended December 31, 2021 and 2022, are as follows: ( i 2021 2022 Beginning ￦ 2,189,375 ￦ 2,314,632 Interest income 39,858 55,902 Remeasurements: Return on plan assets (excluding amounts included in interest income) (130 ) (8,542 ) Benefits paid (271,506 ) (287,419 ) Employer contributions 325,818 401,358 Changes in scope of consolidation , etc. 31,217 2,212 Ending ￦ 2,314,632 ￦ 2,478,143 Amounts recognized in the consolidated statements of profit or loss for the years ended December 31, 2020, 2021 and 2022, are as follows: ( i 2020 2021 2022 Current service cost ￦ 248,047 ￦ 249,125 ￦ 238,068 Net Interest cost 6,494 5,047 3,139 Changes due to settlements of plan & Past Service Cost 1,075 (681 ) (701 ) Transfer out (16,514 ) (16,660 ) (15,102 ) Total expenses ￦ 239,102 ￦ 236,831 ￦ 225,404 Principal actuarial assumptions used are as follows: December 31, 2020 December 31, 2021 December 31, 2022 Discount rate 1.93% 2.55% 5.05% Salary growth rate 4.88% 5.10% 5.15% The sensitivity of the defined benefit obligations as at December 31, 2022, 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 ￦ ￦ 117,362 Salary growth rate 0.5% point 113,037 (105,541 ) 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 analys i is 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 at December 31, 2022, is as follows: ( i Less than 1 year Between 1-2 Between 2-5 Over 5 years Total Pension benefits ￦ 231,594 ￦ 336,926 ￦ 855,642 ￦ 1,922,089 ￦ 3,346,251 The weighted average duration of the defined benefit obligations is 6.0 years.

Defined Contribution Plan

Defined Contribution Plan	12 Months Ended
	Dec. 31, 2022
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Defined Contribution Plan	19. Defined Contribution Plan Recognized expense related to the defined contribution plan for the year ended December 31, 2022, is ￦ ￦ ￦

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2022
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Commitments and Contingencies	20. Commitments and Contingencies As at December 31, 2022, major commitments with local financial institutions are as follows: (in millions of Korean won and Financial institution Limit Used amount Bank overdraft Kookmin Bank and others 372,000 — Inter-Korean Cooperation Fund Export-Import Bank of Korea 37,700 1,974 Economic Cooperation Business Insurance Export-Import Bank of Korea 3,240 1,732 Collateralized loan on electronic accounts receivable-trade Kookmin Bank and others 567,150 28,298 Plus electronic notes payable Industrial Bank of Korea 50,000 1,663 Working capital loan Korea Development Bank and others 1,415,600 165,100 Shinhan Bank USD 72,507 USD 72,507 Woori Bank EUR 7,700 EUR 7,700 Facility loans Shinhan Bank and others 824,000 309,680 Derivatives transaction limit Shinhan Bank 8,000 8,000 Korea Development Bank and others USD 2,510,510 USD 1,970,000 DBS Bank SGD 284,000 SGD 284,000 Citi Bank USD 400,000 JPY 400,000 USD 100,000 Total KRW 3,277,690 516,447 USD 2,983,017 2,142,507 EUR 7,700 7,700 SGD 284,000 284,000 JPY — 400,000 As at December 31, 2022, guarantees received from financial institutions are as follows: (in millions of Korean won and 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 273 Comprehensive credit line and others USD 10,300 Kookmin Bank Guarantee for payment in foreign currency USD 6,484 Shinhan Bank Guarantee for payment in Korean currency and others 36,298 Guarantee for payment in foreign currency and others USD 77,837 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 6,880 HSBC Guarantees for depositions USD 871 Seoul Guarantee Insurance Company Performance guarantee and others 783,247 Korea Software Financial Cooperative Performance guarantee and others 1,445,072 Korea Specialty Contractor Financial Cooperative Performance guarantee and others 531 Korea Housing Finance Corporation Performance guarantee and others 14,464 Information & Communication Financial Cooperative Performance guarantee and others 28,027 Total KRW 2,319,939 USD 109,645 As at December 31, 2022, 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 Engineering Co., Ltd. 1 Gasan Solar Power Plant Inc. Shinhan Bank 4,700 672 Jan. 7, 2010 Jan. 8, 2025 KT Engineering Co., Ltd. 1 SPP Inc. Suhyup Bank 3,250 345 Feb. 17, 2014 Feb. 16, 2024 KT Engineering Co., Ltd. 1 Korea Cell Inc. Suhyup Bank 3,250 338 Feb. 17, 2014 Feb. 16, 2024 KT Engineering Co., Ltd. 1 San-Ya Agricultural Association Corporation Suhyup Bank 3,250 345 Feb. 17, 2014 Feb. 16, 2024 KT Alpha Co., Ltd. (KT Hitel Co., Ltd.) Cash payers T-commerce 860 — Apr. 14, 2022 Nasmedia Co., Ltd. Stockholders Association Members Korea Securities 5,654 986 — 1 According to the above payment guarantee, KT Engineering, a subsidiary of the Group, will have an obligation for repayment if the principal borrower does not repay the borrowing. As at December 31, 2022, the details of the issuance of real estate collateral trust and beneficiary certificates of the Group are as follows: (in millions of Korean won) Commitment Amount provided as Collateral assets Placing Trust collateral beneficiary Real Estate Collateral Trust 1 1st place NongHyup Bank ￦ 100,000 ￦ 120,000 Kyobo Life Insurance 180,000 216,000 Standard Chartered 120,000 144,000 Samsung Life Insurance 100,000 120,000 2nd place Industrial Bank of Korea 40,000 48,000 Korea Investment Capital 40,000 48,000 BNK Capital 30,000 36,000 Standard Chartered 20,000 24,000 NH Capital 20,000 24,000 3rd place 2 LOTTE Engineering & — 736,921 1 The Group provides a certificate of beneficiary rights for land classified as investment properties and inventory assets as collateral in connection with the above real estate collateral trust. 2 The Group provides LOTTE Engineering & Construction with a certificate of third-priority beneficiary rights as collateral in relation to the construction contract amount of ￦ The Controlling Company is jointly and severally obligated with KT Sat Inc. to pay KT Sat Inc.’s liabilities incurred prior to spin-off. As at December 31, 2022, the Controlling Company and KT Sat Inc. are jointly and severally liable for reimbursement of ￦ For the years ended December 31, 2021 and 2022, the Group made agreements with the Securitization Specialty Companies (2022: First 5G 61 th th th th As at December 31, 2022, the Group is a defendant in 189 lawsuits with the total claimed amount of ￦ ￦ ￦ According to the financial and other covenants included in certain debentures 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. At the end of the reporting period, the Group participates in Algerie Sidi Abdela new town development consortium (percentage of ownership: 2.5%) and has joint liability with other consortium participants. At the end of the reporting period, contract amount of property and equipment acquisition agreement made but not yet recognized amounts to ￦ ￦ A t Drag-Along For the year ended December 31, 2022, the Group entered into an agreement with the seller, who participated in the acquisition of shares in MILLIE Co., Ltd Tag-Along For the year ended December 31, 2022, the Group entered into an agreement with financial investors, who participated in the acquisition of shares in Epsilon Global Communications Pte. Ltd. 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). The Group has an additional investment obligation under the agreement to Future Innovation Private Equity Fund No.3. For the year ended December 31, 2022, the remaining amount of ￦ method later. The Group has an obligation to provide financial support as a construction investor during the construction period with respect to K Defense Co., Ltd. established in accordance with the Private Investment Act on Social Infrastructure, and there is a joint responsibility obligation. During the operating period, as an operating investor, the group has an obligation to provide financial support. As at December 31, 2022, the Group entered into a shareholders’ agreement with CJ ENM Co., Ltd., which signed a business cooperation contract with KT Studio Genie Co., Std. If certain conditions under the agreement are not satisfied, CJ ENM Co., Ltd. may exercise its stock purchase right of the Group. As at December 31, 2022, 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. As at December 31, 2022, the Group entered into an agreement with LS Cable & System Ltd., which participated in the stock acquisition contract of KT Submarine Co., Ltd. Under the agreement, LS Cable & System Ltd. may exercise a call-option to the Group in the future and the Group may exercise a put-option

Leases

Leases	12 Months Ended
	Dec. 31, 2022
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Leases	21. Leases Set out below is information for leases when the Group is a lessee. Information on leases when the Group is a lessor is provided in Note 12 . (i) Amounts recognized in the consolidated statements The consolidated statement of financial position shows the following amounts relating to leases: ( i December 31, December 31, Right-of-use assets Property and building ￦ 1,086,133 ￦ 1,081,067 Machinery and communication 64,443 50,794 Others 97,732 148,473 Total ￦ 1,248,308 ￦ 1,280,334 Investment property (buildings) 1 — ( i December 31, December 31, Lease liabilities 1 Current ￦ 332,702 ￦ 315,892 Non-Current 826,667 856,146 Total ￦ 1,159,369 ￦ 1,172,038 1 Included in the line items ‘Other current liabilities and other non-current liabilities’ in the consolidated statement s For the years ended December 31, 2022 and 2021, right-of-use assets increased to ￦ million and ￦ (ii) Amounts recognized in the consolidated statements of profit or loss The consolidated statements of profit or loss show the following amounts relating to leases: ( i December 31, December 31, December 31, Depreciation of Right-of-use assets Property and building ￦ 290,168 ￦ 303,984 ￦ 305,120 Machinery and communication 58,419 41,794 31,140 Others 55,588 52,938 59,954 Total ￦ 404,175 ￦ 398,716 ￦ 396,214 Depreciation of Investment Properties ￦ 19,113 ￦ 1,794 ￦ 15 Interest expense relating to lease liabilities 44,091 36,651 41,469 Expense relating to short-term leases 10,998 7,984 12,876 Expense relating to leases of low-value assets that are not short-term leases 25,894 26,033 26,813 Expense relating to variable lease payments not included in lease liabilities 8,096 8,400 4,827 The total cash outflow for leases for the year ended December 31, 2022 amounts to ￦ ￦ ￦

Share Capital

Share Capital	12 Months Ended
	Dec. 31, 2022
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Share Capital	22. Share Capital As at December 31, 2021 and 2022, the Group’s number of authorized shares is one billion. December 31, 2021 December 31, 2022 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 ￦ ￦ 261,111,808 ￦ ￦ 1 The Group retired 51,787,959 treasury shares against retained earnings. Therefore, the ordinary shares amount differs from the amount resulting from multiplying the number of shares issued.

Retained Earnings

Retained Earnings	12 Months Ended
	Dec. 31, 2022
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Retained Earnings	23. Retained Earnings Details of retained earnings as at December 31, 2021 and 2022, are as follows: ( i December 31, December 31, Legal reserve 1 ￦ 782,249 ￦ 782,249 Voluntary reserves 2 4,651,362 4,651,362 Unappropriated retained earnings 7,853,779 8,821,705 Total ￦ 13,287,390 ￦ 14,255,316 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 In accordance with the Restrictions on Special Taxation Act, R&D and HR related reserves under the voluntary reserves are separately accumulated when retained earnings from tax reserve funds are disposed, when income tax is recalculated from tax return adjustments. Reversal of these provisions can be paid out as dividends according to the related tax law.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income and Other Components of Equity	12 Months Ended
	Dec. 31, 2022
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Accumulated Other Comprehensive Income and Other Components of Equity	24. Accumulated Other Comprehensive Income and Other Components of Equity As at December 31, 2021 and 2022, the details of the Controlling Company’s accumulated other comprehensive income are as follows: ( i December 31, December 31, Changes in investments in associates and joint ventures ￦ (3,461 ) ￦ (11,752 ) Gain ( ) 25,031 (7,109 ) Gain (loss) 108,685 (52,100 ) Exchange differences on translation for foreign operations (12,786 ) (6,815 ) Total ￦ 117,469 ￦ (77,776 ) Changes in accumulated other comprehensive income for the years ended December 31, 2021 and 2022, are as follows: 2021 ( i Beginning Increase/ decrease Reclassification to gain or loss Ending Changes in investments in associates and joint ventures ￦ 16,257 ￦ (19,718 ) ￦ — ￦ (3,461 ) Gain ( ) 19,809 141,805 (136,583 ) 25,031 Gain on valuation of financial assets at fair value through other comprehensive income 61,438 47,247 — 108,685 Exchange differences on translation for foreign operations (11,453 ) (1,333 ) — (12,786 ) Total ￦ 86,051 ￦ 168,001 ￦ (136,583 ) ￦ 117,469 2022 ( i Beginning Increase 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 (loss) 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 ) The Group’s other components of equity as at December 31, 2021 and 2022, are as follows: ( i December 31, December 31, Treasury stock 1 ￦ (1,009,798 ) ￦ (202,295 ) Gain or loss on disposal of treasury stock 2 (8,658 ) (41,503 ) Share-based payments 4,068 6,222 Others 3 (418,692 ) (334,576 ) Total ￦ (1,433,080 ) ￦ (572,152 ) 1 During the year ended December 31, 2022, the Group granted as exchange of shares with HYUNDAI MOBIS and HYUNDAI MOTOR COMPANY (Notes 7 and 20). 2 The amount directly reflected in equity i ￦ million for the year ended December 31, 2022 (2021: ￦ 3 Profit or loss incurred from transactions with non-controlling interest and investment difference incurred from change in proportion of subsidiaries are included. As at December 31, 2021 and 2022, the details of treasury stock are as follows: December 31, December 31, Number of shares (in shares) 25,303,662 5,069,130 Amounts (in millions of Korean won) ￦ 1,009,798 ￦ 202,295 Treasury stocks held as at December 31, 2022, 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, 2022
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Share-based Payments	25. Share-based Payments Details of share-based payments granted by the Controlling to executives and employees, including the CEO, by the resolution of the Board Directors 2021 ( i 15th grant Grant date June 17, 2021 Grantee CEO 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) May 11, 2022 Valuation method Fair value method ( i Employee wage negotiation Grant date September 6, 2021 Grantee All employees Vesting conditions Current employees as of September 6, 2021 Fair value per option (in Korean won) ￦ Total compensation costs (in Korean won) ￦ Estimated exercise date (exercise date) December 10, 2021 Valuation method Fair value method 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) ￦ Estimated exercise date (exercise date) During 2023 Valuation method Fair value method Changes in the number of stock options and the weighted-average exercise price as at December 31, 2021 and 2022, are as follows: (In share) 2021 Beginning Grant Expired Exercised 1 Ending Number of 14th grant 398,856 — (264,286 ) (134,570 ) — — 15th grant — 284,209 — — 284,209 — Employee wage negotiation — 1,432,332 — (1,432,332 ) — — Total 398,856 1,716,541 (264,286 ) (1,566,902 ) 284,209 — (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 — 1 The weighted average price of ordinary shares at the time of exercise , during the year ended December 31, is ￦ ￦

Revenue from Contracts with Cus

Revenue from Contracts with Customers and Relevant Contract Assets and Liabilities	12 Months Ended
	Dec. 31, 2022
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Revenue from Contracts with Customers and Relevant Contract Assets and Liabilities	26. Revenue from Contracts with Customers and Relevant Contract Assets and Liabilities The Group has recognized the following amounts relating to revenue in the Consolidated Statements of Profit or Loss: ( i 2020 2021 2022 Revenue from contracts with customers ￦ 23,895,631 ￦ 24,712,128 ￦ 25,432,727 Revenue from other sources 203,763 185,877 206,128 Other income (Note 27) 341,253 307,654 595,351 Total revenue ￦ 24,440,647 ￦ 25,205,659 ￦ 26,234,206 Operating revenues for the years ended December 31, 2020, 2021 and 2022 are as follows: ( i 2020 2021 2022 Mobile services ￦ 6,805,218 ￦ 6,936,485 ￦ 7,013,889 Fixed-line services 4,827,015 4,960,338 5,056,513 Fixed-line and VoIP telephone services 1,463,553 1,465,059 1,378,265 Broadband Internet access services 2,256,188 2,343,591 2,504,833 Data communication services 1,107,274 1,151,689 1,173,415 Media and content 2,637,691 2,800,630 3,099,776 Financial services 3,493,920 3,661,896 3,836,589 Sale of goods 3,593,127 3,532,973 3,393,646 Others 3,083,676 3,313,337 3,833,793 Total ￦ 24,440,647 ￦ 25,205,659 ￦ 26,234,206 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. The contract assets and liabilities recognized in relation to the revenues from contracts with customers are as follows: ( i December 31, December 31, Contract assets 1 ￦ 821,901 ￦ 963,133 Contract liabilities 1 360,098 344,869 Deferred revenue 2 ￦ 81,136 ￦ 81,653 1 The Group recognized contract assets of ￦ ￦ ￦ ￦ 2 Deferred revenue recognized relating to government grant is excluded. The contract costs recognized as assets are as follows: ( i 2020 2021 2022 Incremental cost of contract establishment ￦ 1,726,191 ￦ 1,726,401 ￦ 1,744,096 Cost of Contract performance 78,757 74,843 73,582 As at December 31, 2022, the Group recognized ￦ ￦ ￦ The recognized revenue arising from carried-forward contract liabilities from prior year is as follows: ( i 2020 2021 2022 Allocation of the transaction price ￦ 251,975 ￦ 275,965 ￦ 246,843 Deferred revenue of joining/installment fee 42,685 42,100 44,204 Total ￦ 294,660 ￦ 318,065 ￦ 291,047

Other Income from Operating Rev

Other Income from Operating Revenue	12 Months Ended
	Dec. 31, 2022
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Summary of Other income	27. Other Income from Operating Revenue Other income for the years ended December 31, 2020, 2021 and 2022, are as follows: ( i 2020 2021 2022 Gains on disposal of property and equipment and investment properties ￦ 20,289 ￦ 54,007 ￦ 52,603 Gains on disposal of intangible assets 2,961 1,726 622 Gain on disposal of right-of-use assets 5,797 3,138 3,326 Compensation on property and equipment 168,263 148,927 159,849 Gains on government subsidies 31,906 43,822 44,473 Gain on disposal of investments in subsidiaries — 244 216,591 Reversal of other allowance for bad debts 890 508 850 Others 111,147 55,282 117,037 Total ￦ 341,253 ￦ 307,654 ￦ 595,351

Operating Expenses

Operating Expenses	12 Months Ended
	Dec. 31, 2022
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Operating Expenses	28. Operating Expenses Operating expenses for the years ended December 31, 2020, 2021 and 2022, are as follows: ( i 2020 2021 2022 Salaries and wages ￦ 4,123,680 ￦ 4,215,810 ￦ 4,495,885 Depreciation 2,605,128 2,605,594 2,637,463 Depreciation of right-of-use 404,175 398,716 396,214 Amortization of intangible assets 624,982 603,327 622,202 Commissions 965,461 1,125,944 1,295,434 Interconnection charges 500,081 507,567 479,500 International interconnection fee 172,529 192,008 186,253 Purchase of inventories 3,681,801 3,753,792 3,656,040 Changes of inventories 257,041 20,491 (195,046 ) Sales commission 2,337,127 2,343,375 2,353,909 Service cost 2,102,875 2,296,324 2,334,386 Utilities 360,797 364,373 368,348 Taxes and dues 283,197 268,651 276,962 Rent 136,355 123,246 160,848 Insurance premium 71,018 66,717 68,245 Installation fee 132,117 154,542 150,140 Advertising expenses 132,466 171,400 195,519 Research and development expenses 156,940 168,969 174,936 Card service cost 2,941,669 3,114,047 3,127,673 Loss on disposal of property and equipment 75,879 71,417 81,415 Loss on disposal of intangible assets 3,207 3,885 7,015 Loss on disposal of right-of-use 7,844 11,457 2,348 Direct cost of government subsidies 31,447 42,732 44,022 Loss on disposal of investments in subsidiaries — 13,727 — Impairment loss on property and equipment 79,775 2,115 16,094 Impairment loss on intangible assets 211,637 3,747 30,965 Donations 20,745 10,981 15,642 Other allowance for bad debts 51,333 28,066 17,551 Others 947,008 823,242 1,266,086 Total ￦ 23,418,314 ￦ 23,506,262 ￦ 24,266,049 Details of salaries and wages for the years ended December 31, 2020, 2021 and 2022, are as follows: ( i 2020 2021 2022 Short-term employee benefits ￦ 3,770,786 ￦ 3,837,359 ￦ 4,161,874 Post-employment benefits(Defined benefit plan) 239,102 236,831 225,404 Post-employment benefits(Defined contribution plan) 61,912 71,068 72,576 Share-based payment 28,604 47,415 16,799 Others 23,276 23,137 19,232 Total ￦ 4,123,680 ￦ 4,215,810 ￦ 4,495,885

Financial Income and Costs

Financial Income and Costs	12 Months Ended
	Dec. 31, 2022
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Financial Income and Costs	29. Financial Income and Costs Details of financial income for the years ended December 31, 2020, 2021 and 2022, are as follows: ( i 2020 2021 2022 Interest income ￦ 270,571 ￦ 273,460 ￦ 271,925 Gain on foreign currency transactions 17,493 19,976 67,976 Gain on foreign currency translation 164,351 32,768 43,092 Gain on derivative transactions 9,397 2,215 50,668 Gain on valuation of derivatives 172 255,149 182,998 Gain on valuation of financial instruments 33,868 90,653 31,032 Others 2,762 52,062 42,737 Total ￦ 498,614 ￦ 726,283 ￦ 690,428 Details of financial costs for the years ended December 31, 2020, 2021 and 2022, are as follows: ( i 2020 2021 2022 Interest expenses ￦ 263,579 ￦ 263,389 ￦ 293,854 Loss on foreign currency transactions 27,805 13,105 81,171 Loss on foreign currency translation 26,340 213,689 200,109 Loss 1,406 6,287 24,331 Loss on valuation of derivatives 163,763 15,947 21,601 Loss on disposal of trade receivables 8,152 22,712 62,697 Loss on valuation of financial instruments 15,646 25,994 65,660 Others 692 2,207 485 Total ￦ 507,383 ￦ 563,330 ￦ 749,908

Deferred Income Tax and income

Deferred Income Tax and income Tax Expense	12 Months Ended
	Dec. 31, 2022
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Deferred Income Tax and income Tax Expense	30. Deferred Income Tax and income Tax Expense The analysis of deferred tax assets and deferred tax liabilities as at December 31, 2021 and 2022, is as follows: ( i December 31, December 31, Deferred tax assets Deferred tax assets to be recovered within 12 months ￦ 398,329 ￦ 398,710 Deferred tax assets to be recovered after more than 12 months 1,754,113 1,907,690 Deferred tax assets before offsetting 2,152,442 2,306,400 Deferred tax liabilities Deferred tax liabilities (642,954 ) (586,522 ) Deferred tax liabilities (1,729,718 ) (2,108,438 ) Deferred tax liabilities before offsetting (2,372,672 ) (2,694,960 ) Deferred tax assets after offsetting ￦ 423,728 ￦ 579,090 Deferred tax liabilities after offsetting ￦ 643,958 ￦ 967,650 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) 2021 Beginning Statement of Other Ending Deferred tax liabilities Investments in associates and joint ventures (181,564 ) (68,166 ) 9,097 (240,633 ) Depreciation and impairment loss (4,175 ) (84,413 ) — (88,588 ) Plan assets (521,257 ) (17,340 ) (331 ) (538,928 ) Advanced depreciation provision (311,918 ) (27,087 ) — (339,005 ) Contract assets (509,509 ) 15,592 — (493,917 ) Financial assets at fair value through profit or loss (627 ) 291 — (336 ) Financial assets at fair value through other comprehensive income (30,623 ) (33,267 ) 16,369 (47,521 ) Others (472,153 ) (150,013 ) (1,578 ) (623,744 ) Total ￦ (2,031,826 ) ￦ (364,403 ) ￦ 23,557 ￦ (2,372,672 ) Deferred tax assets Depreciation and impairment loss 226,960 (1,139 ) — 225,821 Contract liabilities 140,494 7,960 — 148,454 Defined benefit liabilities 598,364 (8,663 ) (18,365 ) 571,336 Provisions 167,384 5,487 — 172,871 Others 758,060 141,727 (244 ) 899,543 Total ￦ 1,891,262 ￦ 145,372 ￦ (18,609 ) ￦ 2,018,025 Temporary difference, net (140,564 ) (219,031 ) 4,948 (354,647 ) Tax credit carryforwards 144,931 (10,514 ) — 134,417 Total net balance ￦ 4,367 ￦ (229,545 ) ￦ 4,948 ￦ (220,230 ) (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 ) The tax impacts recognized directly to equity as at December 31, 2020, 2021, and 2022, are as follows: December 31, 2020 December 31, 2021 December 31, 2022 ( i Before recognition Tax effect After Before recognition Tax effect After Before recognition Tax effect After Gain (loss) ￦ 54,969 ￦ (12,972 ) ￦ 41,997 ￦ 163,892 ￦ (34,112 ) ￦ 129,780 ￦ (216,862 ) ￦ 58,288 ￦ (158,574 ) Gain (loss) on valuation of hedge instruments 37,247 (9,860 ) 27,387 6,916 (1,644 ) 5,272 (42,510 ) 11,180 (31,330 ) Remeasurements of net defined benefit liabilities (77,382 ) 17,201 (60,181 ) 74,518 (18,696 ) 55,822 247,162 (65,733 ) 181,429 Share of gain 25,538 (8,820 ) 16,718 (34,909 ) 9,097 (25,812 ) (14,931 ) 3,748 (11,183 ) Exchange differences on translation for foreign operations (3,614 ) 948 (2,666 ) 683 (178 ) 505 23,316 (5,852 ) 17,464 Gain or loss on disposal of treasury stock (27,786 ) 7,288 (20,498 ) (15,657 ) 4,080 (11,577 ) (59,308 ) 14,886 (44,422 ) Total ￦ 8,972 ￦ (6,215 ) ￦ 2,757 ￦ 195,443 ￦ (41,453 ) ￦ 153,990 ￦ (63,133 ) ￦ 16,517 ￦ (46,616 ) Details of income tax expense for the years ended December 31, 2020, 2021 and 2022, are calculated as follows: ( i 2020 2021 2022 Current income tax expense ￦ 213,225 ￦ 289,471 ￦ 335,796 Impact of change in deferred taxes 72,124 229,545 169,961 Income tax expense ￦ 285,349 ￦ 519,016 ￦ 505,757 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: ( i 2020 2021 2022 Profit before income tax expense ￦ 1,031,605 ￦ 1,978,411 ￦ 1,891,392 Statutory income tax expense ￦ 273,329 ￦ 533,701 ￦ 509,771 Tax effect Income not taxable for taxation purposes (24,657 ) (4,307 ) (47,550 ) Non-deductible expenses 31,741 20,570 53,398 Tax credit (47,056 ) (31,517 ) (54,895 ) Additional payment of income taxes 429 (221 ) 11,744 Adjustments in deferred tax from changes in tax rate — — (41,545 ) Tax effect and adjustment on consolidation Goodwill impairment — — 5,809 Eliminated dividend income form subsidiaries 20,682 7,264 — Changes of out-side tax effect 38,552 4,738 29,922 Intangible Asset impairment and amortization 3,790 796 5,276 Reversal expenses of contract cost assets (6,643 ) (2,932 ) (4,800 ) Change in scope of consolidation — (5,128 ) — Others (4,818 ) (3,948 ) 38,627 Income tax expense ￦ 285,349 ￦ 519,016 ￦ 505,757 Details of deferred tax assets and liabilities that are not recognized as at December 31, 2021 and 2022, are as follows: ( i 2021 2022 Deductible temporary differences Investment in subsidiaries, associates, and joint ventures ￦ 2,355,539 ￦ 3,384,295 Unused tax loss 106,853 103,326 Unused Tax credit 1,376 1,988 Others 119,265 387,084 Total ￦ 2,583,033 ￦ 3,876,693 Taxable temporary differences Investment in subsidiaries, associates, and joint ventures ￦ 568,540 ￦ 857,076 Others — 216,660 Total ￦ 568,540 ￦ 1,073,736 The expected period of expiry for unused tax losses not recognized in deferred tax assets as at December 31, 2021 and 2022, is as follows: ( i 2021 2022 2022 ￦ 4,249 ￦ — 2023 76,133 72,512 2024 4,484 5,011 2025 2,836 3,701 2026 2,390 2,112 2027 3,419 2,534 2028 2,091 396 2029 2,579 617 2030 3,111 2,198 2031 1,841 1,360 Atter 2032 3,720 12,885 Total ￦ 106,853 ￦ 103,326

Earnings per Share

Earnings per Share	12 Months Ended
	Dec. 31, 2022
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Earnings per Share	3 1 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, 2020, 2021 and 2022, is calculated as follows: 2020 2021 2022 Profit attributable to ordinary shares ￦ 700,889 ￦ 1,354,537 ￦ 1,259,686 Weighted average number of ordinary shares outstanding (in number of shares) 245,207,307 235,201,782 242,235,332 Basic earnings per share (in Korean won) ￦ 2,858 ￦ 5,759 ￦ 5,200 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 Controlling Company has dilutive potential ordinary shares from convertible bond and Diluted earnings per share from operations for the years ended December 31, 2020, 2021 and 2022 is calculated as follows: 2020 2021 2022 Profit attributable to ordinary shares (in millions of Korean won) ￦ 700,889 ￦ 1,354,537 ￦ 1,259,686 Adjustment to net income attributable to ordinary shares ( i — — (496 ) Diluted profit attributable to ordinary shares (in millions of Korean won) 700,889 1,354,537 1,259,190 Number of dilutive potential ordinary shares outstanding (in number of shares) 69,598 483,760 91,931 Weighted average number of ordinary shares outstanding (in number of shares) 245,276,905 235,685,542 242,327,263 Diluted earnings per share (in Korean won) ￦ 2,858 ￦ 5,747 ￦ 5,196 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.

Dividend

Dividend	12 Months Ended
	Dec. 31, 2022
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Dividend	32. Dividend The dividends paid by the Group in 2022, 2021 and 2020 were ￦ million ( ￦ per share), ￦ million ( ￦ per share), ￦ million ( ￦ per share), respectively. A dividend in respect of the year ended December 31, 2022, of ￦ per share, amounting to a total dividend of ￦ million, was approved at the shareholders’ meeting on March 31, 2023.

Cash Generated from Operations

Cash Generated from Operations	12 Months Ended
	Dec. 31, 2022
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Cash Generated from Operations	3 3 Cash Generated from Operations Cash flows from operating activities for the years ended December 31, 2020, 2021 and 2022, are as follows: (in millions of Korean won) 2020 2021 2022 1. Profit for the year ￦ 746,256 ￦ 1,459,395 1,385,635 2. Adjustments to reconcile net income Income tax expense 285,349 519,016 505,757 Interest income 1 (291,425 ) (300,900 ) (340,794 ) Interest expense 1 265,035 268,847 320,914 Dividends income 2 (4,442 ) (21,525 ) (14,121 ) Depreciation 2,635,307 2,643,894 2,687,191 Amortization of intangible assets 628,154 604,744 627,261 Depreciation of right-of-use assets 404,174 398,716 396,214 Provision for severance benefits 255,615 253,491 240,506 Impairment losses on trade receivables 139,957 105,344 132,102 Share of net profit or loss of associates and joint ventures (18,041 ) (116,061 ) 16,821 Loss(gain) on disposal of associates and joint ventures 111 1 (38,024 ) Loss(gain) on the disposal of subsidiaries — 13,483 (216,591 ) Loss(gain) on disposal of right-of-use assets 2,047 8,319 (978 ) Impairment losses on assets held for sale — 11 — Impairment loss on property and equipment and investment in properties — 2,115 16,094 Loss on disposal of property and equipment and investment in properties 3 55,590 17,410 (66,317 ) Loss on disposal of intangible assets 246 2,159 6,393 Loss on impairment of intangible assets 211,637 3,747 30,674 Loss(gain) on foreign currency translation (138,011 ) 180,921 157,017 Loss(gain) on valuation and settlement of derivatives, net 155,600 (235,130 ) (205,381 ) Loss on disposal of financial assets at fair value through profit or loss (29,974 ) (29,974 ) (2,347 ) Loss(Gain) on valuation of financial assets at fair value through profit or loss (64,660 ) (64,660 ) 44,833 Loss(gain) on disposal of financial assets at amortized cost 4 (138 ) (35 ) 3 Others 127,949 84,625 (49,891 ) 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 66,462 327,031 (43,787 ) Decrease( i 685,209 (328,610 ) (1,598,216 ) Decrease(increase) in other current assets 9,089 (89,230 ) (101,947 ) Decrease(increase) in other non-current assets (86,039 ) (143,087 ) (120,054 ) Decrease(increase) in inventories 288,507 32,798 (179,255 ) Increase(decrease) in trade payables (135,760 ) 289,044 (368,355 ) Increase(decrease) in other payables (1,232,646 ) 207,583 1,103,113 Increase(decrease) in other current liabilities 127,076 107,993 (30,375 ) Decrease (56,319 ) (14,915 ) (1,015 ) Increase(decrease) in provisions 2,264 (4,668 ) (22,115 ) Increase (decrease (1,948 ) 3,696 (384 ) Increase in plan assets (136,336 ) (114,631 ) (90,771 ) Payment of post-employment (186,520 ) (241,350 ) (343,931 ) 4. Cash generated from operations (1+2+3) ￦ 4,745,293 ￦ 5,829,607 ￦ 3,835,879 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 ￦ The Group made agreements with securitization specialty companies and disposed of its trade receivables related to handset sales (Note 20). Cash flows from the disposals are presented in cash generated from operations. Significant transactions not affecting cash flows for the years ended December 31, 2020, 2021 and 2022, are as follows: ( i 2020 2021 2022 Reclassification of the current portion of borrowings ￦ 1,229,359 ￦ 1,303,543 ￦ 1,004,818 Reclassification of construction-in-progress to property and equipment 3,011,519 2,916,888 3,167,965 Reclassification of accounts payable from property and equipment 22,052 (149,512 ) (7,055 ) Reclassification of accounts payable from intangible assets (345,675 ) 524,040 (197,389 ) Reclassification of payable from defined benefit liabilities 72,346 69,415 (32,417 ) Reclassification of payable from plan assets 66,046 (60,320 ) 28,532 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, 2022
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Changes in Liabilities Arising from Financing Activities	34. Changes in Liabilities Arising from Financing Activities Changes in liabilities arising from financing activities, liabilities related to cashflow to be classified as future financing activities, for the years ended December 31, 2020, 2021 and 2022, are as follows: ( i 2020 Non-cash Beginning Cash Newly Exchange Fair Value Changes consolidati scope Others Ending Borrowing ￦ 7,298,867 ￦ 167,867 ￦ 17,523 ￦ (157,985 ) ￦ — ￦ — ￦ (9,974 ) ￦ 7,316,298 Lease liabilities 1,211,351 (447,784 ) 473,477 (3 ) 40 3,564 (97,005 ) 1,143,640 Other financial liabilities — (13,674 ) 13,674 — — — — — Derivative liabilities 20,096 (943 ) 2,798 142,511 (23,669 ) — (10,220 ) 130,573 Derivative assets (58,576 ) 34,933 — 2,870 (3,456 ) — 16,623 (7,606 ) Total ￦ 8,471,738 ￦ (259,601 ) ￦ 507,472 ￦ (12,607 ) ￦ (27,085 ) ￦ 3,564 ￦ (100,576 ) ￦ 8,582,905 ( i 2021 Beginning Cash Non-cash Ending Newly Exchange Fair Value Changes consolidati scope 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 2022 Beginning Cash Non-cash Ending Newly Exchange Fair value Changes in on scope Others Borrowing ￦ 8,437,703 ￦ 1,391,32 ￦ — ￦ 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 ￦ 1,047,72 ￦ 426,644 ￦ 18,805 ￦ 44,221 ￦ — ￦ (88,737 ) ￦ 11,021,448

Segment Information

Segment Information	12 Months Ended
	Dec. 31, 2022
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Segment Information	35. Segment Information The Group’s operating segments are as follows: Details Business service ICT Mobile/fixed line telecommunication service and convergence business, B2B business and others Finance Credit card business Satellite TV Satellite TV business Real estate Residential building development and supply Others Cable television service , Details of each segment for the years ended December 31, 2020, 2021 and 2022, are as follows: 2020 ( i Operating revenues Operating Income Depreciation and Amortization 1 ICT ￦ 18,275,765 ￦ 809,741 ￦ 3,233,878 Finance 3,344,286 101,825 41,693 Satellite TV 668,320 64,627 58,181 Real estate 543,587 76,431 56,205 Others 5,780,960 122,546 328,165 28,612,918 1,175,170 3,718,122 Elimination (4,172,271 ) (152,837 ) (83,838 ) Consolidated amount ￦ 24,440,647 ￦ 1,022,333 ￦ 3,634,284 2021 ( i Operating revenues Operating Income Depreciation and Amortization 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 29,737,242 1,755,230 3,712,507 Elimination (4,531,583 ) (55,833 ) (104,869 ) Consolidated amount ￦ 25,205,659 ￦ 1,699,397 ￦ 3,607,638 2022 ( i 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 31,456,833 2,073,417 3,852,350 Elimination (5,222,627 ) (105,260 ) (196,471 ) Consolidated amount ￦ 26,234,206 ￦ 1,968,157 ￦ 3,655,879 1 Sum of the amortization of tangible assets, intangible assets, investment properties, and right-of-use assets. For the year ended December 31, 2022, the Group changed certain operating segments for efficient business operation, and comparative information on the relevant segments was restated as the changed operating segments. Operating revenues for the years ended December 31, 2020, 2021 and 2022 and non-current assets as at December 31, 2021 and 2022 by geographical regions, are as follows: (In millions of Korean won) Operating revenues Non-current assets 1 Location 2020 2021 2022 2021.12.31 2022.12.31 Domestic ￦ 24,368,729 ￦ 25,114,719 ￦ 26,074,349 ￦ 20,627,543 ￦ 20,845,214 Overseas 71,918 90,940 159,857 253,638 270,490 Total ￦ 24,440,647 ￦ 25,205,659 ￦ 26,234,206 ￦ 20,881,181 ￦ 21,115,704 1 Non-current assets include property and equipment, intangible assets, investment properties and right-of-use assets.

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2022
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Related Party Transactions	3 6 Related Party Transactions The list of related party of the Group as at December 31, 2022, is as follows: Relationship Name of Entity Associates and joint ventures KIF Investment Fund, QTT Global (Group) Company Limited, CU Industrial Development Co., Ltd., KD Living, Inc., LoginD Co., Ltd., K Bank Inc., Daiwon Broadcasting Co., Ltd., KT-DSC creative economy youth start-up investment fund, Korea Electronic Vehicle Charging Service, K-REALTY RENTAL HOUSING REIT 2, AI RESEARCH INSTITUTE, KT-IBKC Future Investment Fund 1, Gyeonggi-KT Yoojin Superman Fund, FUNDA Co., Ltd., CHAMP IT Co., Ltd., Alliance Internet Corp., Little Big Pictures, Virtua Realm Sendirian Berhad, KT-Smart Factory Investment Fund, Studio Discovery Co., Ltd., KT Young Entrepreneurs DNA Investment Fund, Hyundai Robotics Co., Ltd., IGIS Professional Investors Private Investment Real Estate Investment LLC No. 395, Maruee Limited Company Specializing in the Cultural Industry, Trustay Co., Ltd., The skyk Co., Ltd., Mastern No.127 Logispoint Daegu Co., Ltd., SMART KOREA KT NEXT VENTURE FUND, kt Early Stage Investment Fund, Pacific Professional Investors Private Investment Real Estate Investment LLC No. 55, Mastern KT Multi-Family Real Estate Private Equity Investment Fund I, Home Choice Corp., K-REALTY RENTAL HOUSING REIT V, K-Realty 11th Real Estate Investment Trust Company, IBK-KT Emerging Digital Industry Investment Fund, SG-IBKC K-Contents Investment Fund No.1, Daemuga Limited Company Specializing in the Cultural Industry, Megazone Cloud Corporation, SuseoyeokwhanseungcenterbokhapDevelopment, TeamFresh Corp., KORAMKO No. 143 General Private Real Estate Investment Company, Jumbo Film, KB Three Telecommunications Companies ESG Fund, IGIS No. 468-1 General Private Real Estate Investment Company, Pacific No. 68 General Private Real Estate Investment Company, Kiamco Data Center Blind Fund, Mastern No.172 Seongsu Office PFV Co. Ltd., OASISALPHA Corporation, Shinhan EZ General Insurance, Ltd . Others 1 Goody Studio Co., Ltd., Rebellion Inc., Digital Pharm Co., Ltd. 1 Although it is evaluated by applying IFRS 9, it is included in the scope of related parties under IAS 24 as it has a significant influence. Outstanding balances of receivables and payables in relations to transactions with related parties as at December 31, 2021 and 2022, are as follows: December 31, 2021 Receivables Payables (in millions of Korean won) Trade Other Trade Other Lease liabilities Associates and joint ventures K Bank, Inc. ￦ 821 ￦ 51,422 ￦ — ￦ 513 ￦ — IGIS Professional Investors Private Investment Real Estate Investment LLC No.395 4,614 — — — — Others 565 1,853 343 4,829 — Total ￦ 6,000 ￦ 53,275 ￦ 343 ￦ 5,342 ￦ — December 31, 2022 Receivables Payables (in millions of Korean won) Trade Other Trade Other Lease liabilities 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 Significant transactions with related parties for the years ended December 31, 2020, 2021 and 2022, are as follows: 2020 ( i Sales Purchases 1 Associates and joint ventures K- Realty CR-REITs No.1 ￦ 2,298 ￦ — Korea Information & Technology Investment Fund (KIF Investment Fund) — — K Bank, Inc. 15,658 8,227 Others 809 10,272 Total ￦ 18,765 ￦ 18,499 2020 (in millions of Korean won ) Interest Interest Dividend Associates and joint ventures K- Realty CR-REITs No.1 ￦ — ￦ 917 ￦ 8,061 Korea Information & Technology Investment Fund (KIF Investment Fund) — — 9,241 K Bank, Inc. 14 — — Others — — 43 Total ￦ 14 ￦ 917 ￦ 17,345 1 A , and other s. 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 ￦ — ￦ 205 ￦ 40,142 Korea Information & Technology Investment Fund (KIF Investment Fund) 223 — — K Bank, Inc. — — — Others 2 ,3 — — 8,637 Total ￦ 223 ￦ 205 ￦ 48,779 1 A , 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 ( i 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 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. Key management compensation for the years ended December 31, 2020, 2021 and 2022, consists of: (in millions of Korean won) 2020 2021 2022 Salaries and other short-term benefits ￦ 2,086 ￦ 2,189 ￦ 1,855 Post-employment benefits 390 412 294 Share-based compensation 625 669 976 Total ￦ 3,101 ￦ 3,270 ￦ 3,125 Fund transactions with related parties for the years ended December 31, 2020, 2021 and 2022, are as follows: 2020 Borrowing transactions 1 Equity contributions (in millions of Korean won) Borrowings Repayments Associates and joint ventures K- Realty CR-REITs No.1 ￦ — ￦ 20,304 ￦ — Studio Discovery Co. Ltd. — — 3,000 KT Young Entrepreneurs DNA Investment Fund — — 3,600 KT-Smart Factory Investment Fund — — 2,800 KT-CKP New Media Investment Fund — — (109 ) K Bank, Inc. — — 195,011 Gyeonggi-KT Yoojin Superman Fund — — 1,000 Hyundai Robotics Co. Ltd. — — 50,000 Total ￦ — ￦ 20,304 ￦ 255,302 1 Borrowing transactions include lease transactions. 202 1 Borrowing transactions 1 Equity contributions (in millions of Korean won ) Borrowings Repayments Associates and joint ventures 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 transaction s 2 Others include transactions before exclusion as associates and joint ventures of the Group. 2022 Borrowing transactions 1 Equity (in millions of Korean won) Borrowings Repayments Associates and joint ventures 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 I — — 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 Borrowing transactions include lease transactions. The Group has an obligation to invest in Real Estate Investment Company No.167, a related party, and others according to the agreement. As at December 31, 2022, the Group is planning to make an additional investment of ￦ As at December 31, 2022, 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, 2022
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Financial Risk Management	3 7 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 at December 31, 2020, 2021 and 2022, if the foreign exchange rate had strengthened/weakened by 10% with all other variables held constant, the effects on profit before income tax and shareholders’ equity would have been as follows: (in millions of Korean won) Fluctuation of Impact on profit 1 Impact on 2020.12.31 10% ￦ 25,220 ￦ 36,961 -10% (25,220 ) (36,961 ) 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 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, 2020, 2021 and 2022, are as follows: (In thousands of foreign currencies) 2020 2021 2022 Financial Financial Financial Financial Financial Financial USD 400,046 1,937,935 245,759 2,302,642 106,426 2,336,607 SDR 1 255 728 255 722 255 722 JPY 209,376 46,000,009 29,227 30,000,763 32,801 400,002 GBP — — — 1,005 30 83 EUR 316 162 3,943 10,801 185 7,832 CNY 458 491 — — — — RWF 2 646 — 586 — 15,521 13,025 THB 3 535 — 2,160 — 265 — MMK 4 — — — — — — TZS 5 1,019 — 1,644 — 1,464 — BWP 6 212 — 93 — 183 — HKD 7 — 198 — 105 37 — BDT 8 — — — — — — PLN 9 26 — — — — — VND 10 242,370 — 257,895 — 280,226 — XAF 11 16,229 — — — — — SGD 12 6 284,000 13 284,000 448 284,000 TWD 13 — — — 226 — — CHF 14 — — — 161 — — MYR 15 — — — — 1 — BGN 16 — — — — 62 — 1 Special Drawing Rights. 2 Rwanda Franc. 3 Thailand Bhat. 4 Myanmar Kyat. 5 Tanzanian Shilling. 6 Botswana Pula. 7 Hong Kong Dollar. 8 Bangladesh Taka. 9 Polish Zloty. 10 Vietnam Dong. 11 Central African Franc. 12 Singapore Dollar. 13 Taiwan Dollar. 14 Swiss Franc. 15 Ringgit Malaysia. 16 Bulgarian Lev. (iii) Price risk As at December 31, 2020, 2021 and 2022, 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 2020.12.31 10% ￦ 2,811 ￦ 3,472 -10% (2,811 ) (3,472 ) 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 ) 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 at December 31, 2020, 2021 and 2022, if the market interest rate had increased/decreased by 100 bp with other variables held constant, the effects on profit before income tax and shareholders’ equity would be as follows: (in millions of Korean won) Fluctuation of interest rate Impact on profit Impact on 2020.12.31 + 100 bp ￦ 973 ￦ 18,584 - 100 bp (973 ) (19,377 ) 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 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 at December 31, 2021 and 2022, are as follows: (in millions of Korean won) December 31, 2021 December 31, 2022 Cash and cash equivalents (except for cash on hand) ￦ 2,989,713 ￦ 2,437,629 Trade and other receivables Financial assets at amortized costs 5,687,103 7,459,994 Financial assets at fair value through other comprehensive income 491,713 129,124 Contract assets 745,085 802,253 Other financial assets Derivatives financial assets for hedging 99,453 190,830 Financial assets at fair value through profit or loss 862,481 942,274 Financial assets at fair value through other comprehensive income 94,750 5,432 Financial assets at amortized costs 608,389 1,060,058 Total ￦ 11,578,687 ￦ 13,027,594 The Group is exposed to credit risk for financial guarantee contracts. As at December 31, 2022, 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 irrecoverability 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, 2022. Expected credit loss of 12 months was applied as the credit sales and other credit-related assets of BC Card Co., Ltd., a subsidiary of the Group, has been determined to have low credit risk. (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 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. (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. Management 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, 2021 (in millions of Korean won) Less than 1 year 1-5 years More than Total Trade and other payables ￦ 6,698,783 ￦ 1,232,468 ￦ 159,647 ￦ 8,090,898 Borrowings(including debentures) 1,927,456 5,635,558 2,275,557 9,838,571 Lease liabilities 388,226 484,476 427,860 1,300,562 Other non-derivative financial liabilities 1,473 206,749 100,900 309,122 Financial guarantee contracts 1 71,697 — — 71,697 Total ￦ 9,087,635 ￦ 7,559,251 ￦ 2,963,964 ￦ 19,610,850 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, 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. 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, 2020 ( i Less than 1 year 1-5 years More than Total Derivatives settled gross 2 Outflow ￦ 248,300 ￦ 2,179,046 ￦ 498,619 ￦ 2,925,965 Inflow 249,301 2,074,747 480,570 2,804,618 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 1-5 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 1 During the year ended December 31, 2022, 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 20). 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 at December 31, 2022, the Group is obligated to invest ￦ million in IBK-KT Emerging Digital Industry Investment 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 20 and 3 6 (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 at December 31, 2021 and 2022, are as follows: (in millions of Korean won) December 31, 2021 December 31, 2022 Total liabilities ￦ 20,592,180 ￦ 22,577,114 Total equity 16,567,161 18,412,696 Debt-to-equity ratio 124 % 123 % 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 at December 31, 2021 and 2022, are as follows: (in millions of Korean won, %) December 31, 2021 December 31, 2022 Total borrowings ￦ 8,437,703 ￦ 10,006,685 Less: cash and cash equivalents (3,019,592 ) (2,449,062 ) Net debt 5,418,111 7,557,623 Total equity 16,567,161 18,412,696 Total capital 21,985,272 25,970,319 Gearing ratio 25 % 29 % (3) Offsetting Financial Assets and Financial Liabilities 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, 2021 Gross Gross Net amounts position Amounts not offset Net Financial Cash Trade receivables ￦ 79,102 ￦ — ￦ 79,102 ￦ (65,592 ) ￦ — ￦ 13,510 (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 These include price subject to netting arrangements on facility interconnection and data sharing among telecommunication companies. 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, 2021 Gross Gross offset Net amounts position Amounts not offset Net Financial Cash Trade payables ￦ 69,944 ￦ — ￦ 69,944 ￦ (65,592 ) ￦ — ￦ 4,352 Total ￦ 69,944 ￦ — ￦ 69,955 ￦ (65,592 ) ￦ — ￦ 4,352 (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 Total ￦ 47,271 ￦ (764 ) ￦ 46,507 ￦ (44,518 ) ￦ — ￦ 1,989 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, 2022
Text block [abstract]
Fair Value	38. Fair Value 38.1 Fair Value of Financial Instruments by Category Carrying amount and fair value of financial instruments by category as at December 31, 2021 and 2022, are as follows: December 31, 2021 December 31, 2022 (in millions of Korean won) Carrying Fair value Carrying Fair value Financial assets Cash and cash equivalents ￦ 3,019,592 1 ￦ 2,449,062 1 Trade and other receivables Financial assets measured at amortized cost 2 5,610,377 1 7,364,516 1 Financial assets at fair value through other comprehensive income 491,713 491,713 129,124 129,124 Other financial assets Financial assets measured at amortized cost 608,389 1 1,060,058 1 Financial assets at fair value through profit or loss 952,319 952,319 1,064,856 1,064,856 Financial assets at fair value through other comprehensive income 347,877 347,877 1,508,192 1,508,192 Derivative financial assets for hedging purpose 99,453 99,453 190,830 190,830 Total ￦ 11,129,720 ￦ 13,766,638 Financial liabilities Trade and other payables ￦ 7,980,203 1 ￦ 8,397,264 1 Borrowings 8,437,703 8,578,827 10,006,685 9,405,992 Other financial liabilities Financial liabilities at amortized cost 263,500 1 246,606 1 Financial liabilities at fair value through profit or loss 216,040 216,040 141,280 141,280 Derivative financial liabilities for hedging purpose 18,126 18,126 33,555 33,555 Total ￦ 16,915,572 ￦ 18,825,390 1 The Group did not conduct fair value estimation since the book amount is a reasonable approximation of the fair value . 2 With the application of IFRS 7, lease receivables are excluded from th e 38.2 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 market s using val • 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 or its fair value is disclosed as at December 31, 2021 and 2022, are as follows: December 31, 2021 (in millions of Korean won) Level 1 Level 2 Level 3 Total Assets Trade and other receivables Financial assets at fair value through other comprehensive income ￦ — ￦ 491,713 ￦ — ￦ 491,713 Other financial assets Financial assets at fair value through profit or loss 24,285 350,949 577,085 952,319 Financial assets at fair value through other comprehensive income 17,328 7,176 323,373 347,877 Derivative financial assets for hedging purpose — 67,888 31,565 99,453 Investment properties — — 4,263,381 4,263,381 Total ￦ 41,613 ￦ 917,726 ￦ 5,195,404 ￦ 6,154,743 Liabilities Borrowings ￦ — ￦ 8,578,827 ￦ — ￦ 8,578,827 Other financial liabilities Financial liabilities at fair value through profit or loss — 708 215,332 216,040 Derivative financial liabilities for hedging purpose — 18,126 — 18,126 Total ￦ — ￦ 8,597,661 ￦ 215,332 ￦ 8,812,993 (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 comprehensive income 1,005,900 5,163 497,129 1,508,192 Derivative financial assets for hedging purpose — 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 38.3 Transfers Between Fair Value Hierarchy Levels of 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. Details of changes in Level 3 of the fair value hierarchy for the recurring fair value measurements as at December 31, 2021 and 2022, are as follows: 2021 Financial assets Financial liabilities (in millions of Korean won) Financial assets Financial assets Derivative Financial Beginning balance ￦ 432,509 ￦ 50,789 ￦ (4,194 ) ￦ 2,637 Acquisition 492,842 118,648 — 205,323 Reclassification (25,757 ) 14,633 — — Changes in c s 353 (3,051 ) — 46,208 Disposal (418,029 ) (5,325 ) — — Amount recognized in profit or loss 2 95,167 71 43,150 (38,836 ) Amount recognized in other 2 — 147,608 (7,391 ) — Ending balance ￦ 577,085 ￦ 323,373 ￦ 31,565 ￦ 215,332 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. 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 ) Changes in consolidation scope — (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 financial liabilities measured at fair value through profit or loss consists of derivative valuation gains and losses. 2 The recognition of gains and losses on derivatives financial liabilities for hedging purposes consists entirely of derivatives valuation gains. 38.4 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 at December 31, 2021 and 2022, are as follows: December 31, 2021 (in millions of Korean won) Fair value Level Valuation techniques Inputs Assets Trade and other receivables Financial assets at fair value ￦ 491,713 2 DCF Model Guaranteed bond interest Other financial assets Financial assets at fair value 928,034 2,3 DCF Model, Bond interest rate, Underlying asset price Financial assets at fair value 330,549 2,3 DCF Model, Discount rate Derivative financial assets for 99,453 2,3 Hull-White Model, Market observation discount rate Investment properties 4,263,381 3 DCF Model Liabilities Borrowings ￦ 8,578,827 2 DCF Model Bond interest rate Other financial liabilities Financial liabilities at fair value 216,040 2,3 DCF Model, Forward rate, Market interest rate Derivative financial liabilities for 18,126 2 DCF Model Market observation December 31, 2022 (in millions of Korean won) Fair value Level Valuation techniques Inputs Assets Trade and other receivables Financial assets at fair value ￦ 129,124 2 DCF Model Guaranteed bond interest Other financial assets Financial assets at fair value 1,038,209 2,3 DCF Model, Model, Market Interest rate, Underlying asset price Financial assets at fair value through 502,292 2,3 DCF Model, Discount rate Derivative financial assets for hedging 190,830 2,3 Hull-White Model, Market observation discount rate, 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 2,3 DCF Model Binomial Option Pricing Model, Monte-Carlo Simulation Derivative financial liabilities for hedging 33,555 2 DCF Model Market observation 38.5 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 discusses valuation processes and results with the CFO in line with the Group’s closing dates. 38.6 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 for the year. In relation to this, details and changes of the total deferred difference for the years ended December 31, 2021 and 2022, are as follows: (in millions of Korean won) 2021 2022 Derivatives used Derivative held Derivatives used Derivative held I. Beginning balance ￦ 2,257 ￦ — ￦ 832 ￦ — II. New transactions — — — — III. Recognized at fair value through profit or loss (1,425 ) — (832 ) — IV. Ending balance (I+II+III) ￦ 832 ￦ — ￦ — ￦ —

Interests in Unconsolidated Str

Interests in Unconsolidated Structured Entities	12 Months Ended
	Dec. 31, 2022
Investments accounted for using equity method [abstract]
Interests in Unconsolidated Structured Entities	39. Interests in Unconsolidated Structured Entities 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 at December 31, 202 2 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 at December 31, 2022, 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. Details of scale of unconsolidated structured entities and nature of the risks associated with an entity’s interests in unconsolidated structured entities as at December 31, 2021 and 2022, are as follows: (in millions of Korean won) December 31, 2021 Real Estate PEF and Asset Total Total assets of unconsolidated structured entities ￦ 2,343,487 ￦ 5,202,439 ￦ 2,256,256 ￦ 9,802,182 Assets recognized in statement of financial position Other financial assets ￦ 40,587 ￦ 237,841 ￦ — ￦ 278,428 Joint ventures and associates 125,009 246,440 — 371,449 Total ￦ 165,596 ￦ 484,281 ￦ — ￦ 649,877 Maximum loss exposure 1 Investment assets ￦ 165,596 ￦ 484,281 ￦ — ￦ 649,877 Investment agreement, etc — 63,489 — 63,489 Total ￦ 165,596 ￦ 547,770 ￦ — ￦ 713,366 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 by agreements including purchase agreements, credit granting and others. (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, etc 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 by agreements including purchase agreements, credit granting and others.

Information About Non-controlli

Information About Non-controlling Interests	12 Months Ended
	Dec. 31, 2022
Text block [abstract]
Information About Non-controlling Interests	40. Information About Non-controlling Interests 40.1 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, 2020, 2021 and 2022 are as follows: (In millions of Korean won) December 31, 2020 Non- Accumulated non-controlling Profit or loss non-controlling Dividend s Others Accumulated non-controlling KT Skylife Co., Ltd. 49.7 % ￦ 375,906 ￦ 22,171 ￦ (8,279 ) ￦ (898 ) ￦ 388,900 BC Card Co., Ltd. 30.5 % 417,475 9,899 (22,787 ) 7,239 411,826 KT Powertel Co., Ltd. 55.2 % 54,276 2,151 (478 ) (202 ) 55,747 KT Alpha Co., Ltd. (KT Hitel Co.,Ltd.) 32.9 % 54,709 (1,840 ) — (2,563 ) 50,306 KT Telecop Co., Ltd. 13.2 % 3,650 152 — (208 ) 3,594 (In millions of Korean won) December 31, 2021 Non- Accumulated non-controlling Profit or loss non-controlling Dividend s 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- Accumulated non-controlling Profit or loss non-controlling Dividend s Others Accumulated non-controlling KT Skylife C o., 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 40 The summarized financial information for each subsidiary with non-controlling interests that are material to the Group, before inter-company eliminations, is as follows: Summarized consolidated statements of financial position as at December 31, 2020, 2021 and 2022, are as follows: December 31, 2020 (in millions of Korean won) KT Skylife BC Card Co., KT Powertel KT Alpha Co., Non-controlling Interests rate (%) 49.7 % 30.5 % 55.2 % 32.9 % Current assets ￦ 480,450 ￦ 1,785,914 ￦ 90,056 ￦ 140,948 Non-current assets 439,026 1,298,484 29,638 148,001 Current liabilities 153,236 1,602,667 17,045 74,045 Non-current liabilities 21,803 176,083 1,788 18,554 Equity 744,437 1,305,648 100,861 196,350 Operating revenue 706,631 3,387,640 65,897 350,231 Profit for the year 58,190 39,455 3,809 2,080 Total comprehensive income (loss) 55,647 61,796 3,442 (8,700 ) Cash flows from operating activities 160,934 (119,163 ) 6,011 62,521 Cash flows from investing activities (105,293 ) 58,042 (3,353 ) (58,186 ) Cash flows from financing activities (19,650 ) 22,790 (1,515 ) (1,856 ) Net increase (decrease) in cash and cash equivalents 35,991 (38,331 ) 1,143 2,479 Cash and cash equivalents at beginning of year 63,850 279,162 6,217 37,043 Exchange differences (7 ) (247 ) — (83 ) Cash and cash equivalents at end of year 99,834 240,584 7,360 39,439 December 31, 2021 (in millions of Korean won) KT Skylife Co., Ltd. BC Card Co., KTIS KTCS Nasmedia, Non-controlling Interests rate (%) 49.7 % 30.5 % 68.6 % 79.7 % 56.0 % Current assets ￦ 408,484 ￦ 1,991,152 ￦ 124,420 ￦ 302,953 ￦ 409,345 Non-current assets 867,161 1,942,275 244,941 113,797 81,049 Current liabilities 249,676 1,658,476 103,927 189,641 248,648 Non-current liabilities 220,018 822,528 73,691 44,530 19,970 Equity 805,951 1,452,423 191,743 182,579 221,776 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 Total comprehensive income 74,995 122,578 28,669 16,914 27,991 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 year 80,672 326,482 30,521 63,884 71,396 December 31, 2022 (in millions of Korean won) KT Skylife BC Card Co., KTIS KTCS Nasmedia, Non-controlling Interests rate (%) 49.8 % 30.5 % 66.7 % 78.3 % 56.0 % 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 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 Total comprehensive income 34,485 143,055 13,502 17,500 26,996 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 year 98,695 435,047 24,944 61,814 86,133 40.3 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, 2020, 2021 and 2022 is summarized as follows: (in millions of Korean won) 2020 2021 2022 Carrying amount of non-controlling interests acquired ￦ 1,750 ￦ 14,702 ￦ 19,272 Consideration paid to non-controlling interests 9,878 1,095 69,652 Effect of changes in equity (net amount) ￦ 11,628 ￦ 15,797 ￦ 88,924

Business Combination

Business Combination	12 Months Ended
	Dec. 31, 2022
Text block [abstract]
Business Combination	41. Business Combination Kt cloud Co., Ltd., a subsidiary of the Group, acquired common shares %) of SPARK AND ASSOCIATES INC. for ￦ million on October 4, 2022 to secure business capabilities of the car cloud business and also gain first mover advantage in the multi/hybrid cloud market. The details of major business combinations that occurred for the year ended December 31, 2022, are as follows : (in millions of Korean won) Major transfer business Business Transfer price SPARK AND ASSOCIATES INC. Network service industry Oct. 4, 2022 20,328 The values of assets and liabilities acquired on the acquisition date from major business combinations for the year ended December 31, 2022, are as follows: (in millions of Korean won) SPARK AND I. Total transfer price (A) ￦ 20,328 II. Amount recognized as identifiable assets and liabilities Fair value of identifiable assets 11,446 Cash and cash equivalents 427 Trade and other receivables, net 1,039 Property and equipment, net 23 Intangible assets, net 9,715 Other assets 242 Fair value of identifiable liabilities 2,793 Trade and other payables 410 Current income tax liabilities 32 Net defined benefit liabilities 21 Other liabilities 2,330 Total identifiable net assets (B) 8,653 III. Non-controlling interest (C) — IV. Fair value of net assets acquired (D=B-C) 8,653 V. Goodwill (E=A-D) ￦ 11,675 Intangible assets additionally identified by the Group as a result of major business combinations for the year ended December 31, 2022, are as follows: (in millions of Korean won) Goodwill Customer SPARK AND ASSOCIATES INC. ￦ 11,675 ￦ 9,715 Operating revenue and net profit and loss before elimination of intercompany transactions of the acquired companies transferred through major business combinations for the year ended December 31, 2022, are as follows: (in millions of Korean won) After business 2022 1 Operating Profit (loss) for Operating Profit (loss) for SPARK AND ASSOCIATES INC. ￦ 1,637 ￦ 413 ￦ 6,856 ￦ 670 1 Operating revenue and profit or loss of the entity for the current reporting period as though th e acquisition date f

Events after Reporting Period

Events after Reporting Period	12 Months Ended
	Dec. 31, 2022
Text block [abstract]
Events after Reporting Period	4 2 Events After Reporting Period The Group has issued the following bonds since the end of the reporting period. Type Issuance date Face value (in millions Interest Redemption The 198-1st Public bond Jan. 12, 2023 ￦ 70,000 3.847 % Jan. 10, 2025 The 198-2nd Public bond Jan. 12, 2023 150,000 3.869 % Jan. 12, 2026 The 198-3rd Public bond Jan. 12, 2023 80,000 3.971 % Jan. 12, 2028 The Group decided to acquire treasury stocks equivalent to ￦ ￦ e acquired

Significant Accounting Polici_2

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2022
Text block [abstract]
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) – measured at fair value • Assets held-for-sale – measured at fair value less costs to sell • Defined benefit pension plans – plan assets measured at fair value The preparation of the consolidated financial statements requires the use of certain critical accounting estimates. Management needs judgement assumptions
Changes in Accounting Policy and Disclosures	2.2 Changes in Accounting Policy and Disclosures (1) New and amended standards adopted by the Group The Group has applied the following standards and amendments for the first time for their annual reporting period commencing January 1, 2022. - Amendments to IFRS 16 Leases – Concession on COVID-19—Related Rent Concessions Beyond June 30, 2021 The application of the practical expedient, a lessee may elect not to assess whether a rent concession occurring as a direct consequence of the COVID-19 pandemic is a lease modification, is extended to lease payments originally due on or before June 30, 2022. A lessee shall apply the practical expedient consistently to eligible contracts with similar characteristics and in similar circumstances. The amendments do not have a significant impact on the consolidated financial statements. - Amendments to IFRS 3 Business Combination – Reference to the Conceptual Framework The amendments update a reference of definition of assets and liabilities to be recognized in a business combination in revised Conceptual Framework for Financial Reporting. However, the amendments add an exception for the recognition of liabilities and contingent liabilities within the scope of IAS 37 Provisions, Contingent Liabilities and Contingent Assets Levies - Amendments to IAS 16 Property, Plant and Equipment – Proceeds Before Intended Use The amendments prohibit an entity from deducting from the cost of an item of property, plant and equipment any proceeds from selling items produced while the entity is preparing the asset for its intended use. Instead, the entity will recognize the proceeds from selling such items, and the costs of producing those items, in profit or loss. The amendments do not have a significant impact on the consolidated financial statements. - Amendments to IAS 37 Provisions, Contingent Liabilities and Contingent Assets – Onerous Contracts: Cost of Fulfilling a Contract The amendments clarify that the direct costs of fulfilling a contract include both the incremental costs of fulfilling the contract and an allocation of other costs directly related to fulfilling contracts when assessing whether the contract is onerous. The amendments do not have a significant impact on the consolidated financial statements. - Annual improvements of IFRS 2018-2020 Cycle should be applied for annual periods beginning on or after January 1, 2022, and earlier application is permitted. The Group does not expect that these amendments have a significant impact on the financial statements. • IFRS 1 First Time Adoption of Korean International Financial Reporting Standards • IFRS 9 Financial Instruments • IFRS 16 Leases • IAS 41 Agriculture (2) 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, 2022 reporting periods and have not been early adopted by the Group. - Amendments to IAS 1 Presentation of Financial Statements – Classification of Liabilities as Current or Non-Current The amendments clarify that liabilities are classified as either current or non-current, depending on the substantive rights that exist at the end of the reporting period. Classification is unaffected by the likelihood that an entity will exercise right to defer settlement of the liability or the expectations of management. Also, the settlement of liability include the transfer of the entity’s own equity instruments, however, it would be excluded if an option to settle them by the entity’s own equity instruments if compound financial instruments is met the definition of equity instruments and recognized separately from the liability. The amendments should be applied for annual periods beginning on or after January 1, 2024 - IAS 1 Presentation of Financial Statements – Disclosure of Accounting Policies The amendments to IAS 1 define and require entities to disclose their material accounting policies. The IASB amended IFRS Practice Statement 2 Disclosure of Accounting Policies to provide guidance on how to apply the concept of materiality to accounting policy disclosures. The amendments should be applied for annual periods beginning on or after January 1, 2023, and earlier application is permitted. The Group is in review for the impact of these amendments on the financial statements. - IAS 8 Accounting Policies, Changes in Accounting Estimates and Errors – Definition of Accounting Estimates The amendments define accounting estimates and clarify how to distinguish them from changes in accounting policies. The amendments should be applied for annual periods beginning on or after January 1, 2023, and earlier application is permitted. The Group does not expect that these amendments will have a significant impact on the financial statements. - IAS 12 Income Taxes – Deferred Tax Related to Assets and Liabilities Arising From a Single Transaction The amendments include an additional condition to the exemption to initial recognition of an asset or liability that a transaction does not give rise to equal taxable and deductible temporary differences at the time of the transaction. The amendments should be applied for annual periods beginning on or after January 1, 2023, and earlier application is permitted. The Group is in review for the impact of these amendments on the financial statements. - IAS 1 Presentation of Financial Statements – Disclosure of Gain or Loss on Valuation of Financial Liabilities Subject to Adjustment of Exercise Price If the entire or a part of financial instrument, whose exercise price is subject to change due to the issuer’s share price, is classified as a financial liability, the carrying amount of the financial liability and related gains and losses shall be disclosed. The amendments should be applied for annual periods beginning on or after January 1, 2023, and earlier application is permitted. The Group does not expect that these amendments wil l
Consolidation	2.3 Consolidation The Group has prepared the consolidated financial statements in accordance with IFRS 10 Consolidated Financial Statements (1) 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. (2) 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 Group. (3) 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. (4) 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. (5) 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 35). 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 (1) 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. (2) 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 borrowings are presented in the statement of profit or loss, within finance costs. 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 , 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’ ‘ costs’ ‘ • 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’ ‘ 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. Dividends 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’ ‘ (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 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 38. 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 for trade receivables and Note 2.6 (c) for a description of the Group’s impairment policies.
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.
Non-Current Assets (or Disposal Group) Held-for-Sale	2.10 Non-Current Assets (or Disposal Group) Held-for-Sale Non-current assets (or disposal group) are classified as assets held for sale when their carrying amount will be recovered principally through a sale transaction rather than through continued use and when a sale is considered highly probable. The assets are measured at the lower amount between their carrying amount and the fair value less selling costs.
Property and Equipment	2.11 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 – 6 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	2.12 Investment Property Real estate held for rental income or investment gains is classified as investment property and right-of-use asset. An investment property is measured initially at its cost. After recognition as an asset, investment property is carried at cost less accumulated depreciation and impairment losses. Investment property, except for land, is depreciated using the straight-line method over their useful lives from 5 to 40 years.
Intangible Assets	2.13 Intangible Assets (1) Goodwill Goodwill is measured as explained in Note 2.3 (1) and goodwill arising from acquisition of subsidiaries and business are 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 business 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. (2) 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 Useful Life Development costs 3 – 7 years Software 3 – 7 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	2.14 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	2.15 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
Impairment of Non-Financial Assets	2.16 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	2.17 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	2.18 Financial Liabilities (1) 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’, ‘borrowings’ and ‘other financial liabilities’ in the statement of financial position. Borrowings are net of redemption draw-down occurs borrowings services 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. (2) 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	2.19 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	2.20 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	2.21 Employee Benefits (1) 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. (2) 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. (3) 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	2.22 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	2.23 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	2.24 Leases (a) Lessee The Group leases various repeater server rack, 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: • 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, 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. As a result of adopting the new lease standard, the Group applied the accounting for assets held as a lessor. (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	2.25 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	2.26 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 the commission fees when new customers subscribe for 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	2.27 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 the 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	2.28 Dividend Dividend distribution to the Group’s shareholders is recognized as a liability in the financial statements in the period
Approval of the Consolidated Financial Statements	2.29 Approval of Issuance of the Financial Statements The consolidated financial statements of 2022 were approved for issuance by the Board of Directors on April 13, 2023 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, 2022
Text block [abstract]
Summary of Consolidated Subsidiaries	The consolidated subsidiaries as at December 31, 2021 and 2022, are as follows: Controlling percentage 1 Subsidiary Type of business Location December 31, December 31, Closing month KT Linkus Co., Ltd. Public telephone maintenance Korea 92.4 % 92.4 % December KT Submarine Co., Ltd. 2,4 Submarine cable construction and maintenance Korea 39.3 % 32.9 % December KT Telecop Co., Ltd. Security service Korea 86.8 % 86.8 % December KT Alpha Co., Ltd. (KT Hitel Co., Ltd.) 4 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.2 Investment fund 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 month VP Inc. 4 Payment security service for credit card, others Korea 50.9 % 69.7 % 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. 4 Internet banking ASP and security solutions Korea 58.2 % 61.3 % December Smartro Co., Ltd. VAN (Value Added Network) business Korea 64.5 % 64.5 % December KTDS Co., Ltd. 4 System integration and maintenance Korea 95.5 % 95.6 % December KT M&S Co., Ltd. PCS distribution Korea 100.0 % 100.0 % December GENIE Music Corporation 3,4 Online music production and distribution Korea 36.2 % 36.0 % December KT MOS Bukbu Co., Ltd. 4 Telecommunication facility maintenance Korea 100.0 % 100.0 % December KT MOS Nambu Co., Ltd. 4 Telecommunication facility maintenance Korea 98.4 % 98.4 % December KT Skylife 4 Satellite TV Korea 50.3 % 50.2 % 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 (KT AMC Co., Ltd.) 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. 3,4 Solution provider and IPTV advertisement sales business Korea 44.0 % 44.0 % 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 KT-Michigan Global Content Fund Content investment business Korea 88.6 % 88.6 % December KTCS Corporation 2,4 Database and online information provider Korea 32.2 % 34.1 % December KTIS Corporation 2,4 Database and online information provider Korea 31.4 % 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 East Telecom LLC Wireless/fixed line internet business Uzbekistan 91.6 % 91.6 % December Controlling percentage 1 Subsidiary Type of business Location December 31, December 31, Closing month 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 100.0 % 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 80.0 % 79.8 % December HCN Co., Ltd. Cable television service Korea 100.0 % 100.0 % December Millie Seojae 3 Book contents service Korea 38.6 % 38.6 % 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 Epsilon M E A General Trading LLC 3 Local counter work United Arab Emirates 49.0 % 49.0 % 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 Alticast B.V. Software development and delivery Netherlands 100.0 % 100.0 % December 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 % December Hangang Real Estate Investment Trust No. 24 Investment fund Korea — 75.0 % December Controlling percentage 1 Subsidiary Type of business Location December 31, December 31, Closing month KT DX Vietnam Company Limited Software development Vietnam — 100.0 % December kt cloud Co., Ltd. Information telecommunication business Korea — 100.0 % December Pocheon Jeonggyori Development Co., Ltd. Residential building development Korea — 80.9 % December Alpha DX Solution Co., Ltd. Data communication service Korea — 100.0 % December PT CRANIUM ROYAL ADITAMA Software development Indonesia — 67.0 % December KT Primorye IDC LLC Data processing and associated service delivery Russia — 99.0 % December Juice Inc. 3 Online information provider/Software development and delivery Korea — 41.2 % December SPARK AND ASSOCIATES INC. Network service industry Korea — 100.0 % December 1 Sum of the ownership interests owned by the Controlling Company and subsidiaries. 2 Although the Controlling Company owns less than 50% ownership in this entity, this entity is consolidated as the Controlling Company can exercise the majority voting rights in its decision-making process at all times considering the historical voting pattern at the shareholders’ meetings. 3 Although the Controlling Company owns less than 50% ownership in this entity, this entity is consolidated as the Controlling Company holds the majority of voting right based on an agreement with other investors. 4 The number of subsidiaries’ treasury stock is deducted from the total number of shares when calculating the controlling percentage ownership. 1.3 Changes in Scope of Consolidation Subsidiaries newly Changes Location Name of Subsidiary Reason Included Russia KT RUS LLC Newly established Included Korea Hangang Real Estate Investment Trust No. 24 Newly established Included Vietnam KT DX Vietnam Company Limited Newly established Included Korea kt cloud Co., Ltd. Newly established Included Korea Pocheon Jeonggyori Development Co., Ltd. Newly established Included Korea Alpha DX Solution Co., Ltd. Split-off Included Indonesia PT CRANIUM ROYAL ADITAMA Transferred Included Russia KT Primorye IDC LLC Newly established Included Korea SPARK AND ASSOCIATES INC. Transferred Included Korea Juice Inc. Transferred Excluded Korea MEDIA GENIE Co., Ltd. Merged Excluded Korea kt seezn Co., Ltd. Merged Excluded UK 7D Digital Limited Liquidated Excluded Korea Whowho&Company Co., Ltd. Merged Summarized information for consolidated subsidiaries as at and for the years ended December 31, 2020, 2021 and 2022 is as follows: ( in December 31, 2020 Total assets Total Operating Profit (loss) for the year KT Powertel Co., Ltd. ￦ 119,694 ￦ 18,833 ￦ 65,897 ￦ 3,809 KT Linkus Co., Ltd. 58,372 54,022 84,519 (3,212 ) KT Submarine Co., Ltd. 116,813 14,032 110,201 1,197 KT Telecop Co., Ltd. 318,456 193,737 392,489 212 KT Alpha Co., Ltd. (KT Hitel Co., Ltd.) 288,949 92,599 350,231 2,080 KT Service Bukbu Inc. 60,825 56,554 217,451 (871 ) KT Service Nambu Inc. 58,182 51,460 264,776 (456 ) BC Card Co., Ltd. 1 3,084,398 1,778,751 3,387,640 39,455 H&C Network 1 269,651 61,365 322,690 2,413 Nasmedia Co., Ltd. 1 422,039 221,371 113,136 23,134 KTDS Co., Ltd. 1 183,297 133,129 499,990 10,635 KT M Hows Co., Ltd. 104,704 76,315 44,860 6,935 KT M&S Co., Ltd. 231,260 197,306 661,533 (485 ) GENIE Music Corporation 250,538 88,488 247,237 9,472 KT MOS Bukbu Co., Ltd. 32,167 26,070 67,975 1,473 KT MOS Nambu Co., Ltd. 33,765 24,947 71,259 1,639 KT Skylife Co., Ltd. 1 919,476 175,039 706,631 58,190 KT Estate Inc. 1 1,689,601 325,429 365,335 14,370 KTGDH Co., Ltd. (KTSB Data Service) 11,003 1,669 4,282 538 KT Sat Inc. 630,740 92,791 173,693 14,753 KT Sports Inc. 26,572 14,940 46,608 (2,516 ) KT Music Contents Fund No.1 4,844 1,525 243 84 KT Music Contents Fund No.2 15,021 285 169 (116 ) KT-Michigan Global Contents Fund 10,382 175 111 (1,420 ) Autopion Co., Ltd. 4,903 4,961 6,174 (2,459 ) KT M Mobile Inc. 129,011 27,281 163,472 (3,617 ) KT Investment Co., Ltd. 1 115,627 93,695 47,801 4,680 KTCS Corporation 1 384,919 215,175 933,006 11,323 KTIS Corporation 294,289 126,894 454,172 7,387 Next Connect PFV Inc. 394,268 37,271 26 (7,101 ) KT Japan Co., Ltd. 1 2,694 2,622 1,853 1 Korea Telecom China Co., Ltd. 381 21 618 (492 ) KT Dutch B.V. 1 29,585 10,109 26,782 6,061 KT AMERICA, INC 4,498 125 6,808 712 KT Rwanda Networks Ltd. 2 114,768 191,781 17,870 (34,610 ) KT Belgium 87,608 — (81 ) (81 ) KBTO sp.z o.o. 438 117 490 (2,823 ) AOS Ltd. 2 11,812 3,875 5,719 296 KT Hong Kong Telecommunications Co., Ltd. 6,159 2,800 16,386 1,308 KT Hopemate 3,720 2,787 5,239 (13 ) GE Premier 1st Corporate Restructuring Real Estate Investment Trust Co. 5,703 1,165 333 83 Storywiz Co., Ltd 21,594 10,065 19,209 (1,954 ) KT Engineering Co., Ltd. (KT ENGCORE Co., Ltd.) 138,220 102,963 346,040 (8,461 ) 1 These companies are the intermediate controlling companies of other subsidiaries and the above financial information is from their consolidated financial statements. 2 At the end of the reporting period, convertible preferred stock issued by subsidiaries is included in liabilities. (In millions of Korean won) December 31, 2021 Total assets Total 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 ( i December 31, 2022 Total assets Total 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. 1 516,945 275,730 153,211 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 At the end of the reporting period, convertible preferred stock issued by subsidiaries is included in liabilities. 3 Profit or loss is included from the date of acquisition of control to the end of the reporting period.

Significant Accounting Polici_3

Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2022
Text block [abstract]
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 – 6 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 – 7 years Software 3 – 7 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, 2022
Text block [abstract]
Summary of Financial Instruments by Category	Financial instruments by category as at December 31, 202 1 an (in millions of Korean won) December 31, 2021 Financial assets Financial Financial Financial Derivatives used for Total Cash and cash equivalents ￦ 3,019,592 ￦ — ￦ — ￦ — ￦ 3,019,592 Trade and other receivables 5,687,103 — 491,713 — 6,178,816 Other financial assets 608,389 952,319 347,877 99,453 2,008,038 (in millions of Korean won) December 31, 2021 Financial liabilities Financial Financial profit and Derivatives Others Total Trade and other payables ￦ 7,980,203 ￦ — ￦ — ￦ — ￦ 7,980,203 Borrowings 8,437,703 — — — 8,437,703 Other financial liabilities 263,500 216,040 18,126 — 497,666 Lease liabilities — — — 1,159,369 1,159,369 (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 Financial profit and Derivatives used for Others Total Trade and other payables ￦ 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
Summary of Gains or Losses Arising From Financial Instruments by Category	Gains or losses arising from financial instruments by category for the years ended December 31, 2020, 2021 and 2022, are as follows: (in millions of Korean won) 2020 2021 2022 Financial assets at amortized cost Interest income 1 ￦ 55,742 ￦ 74,937 ￦ 144,505 Gain (loss) on foreign currency transactions 4 (19,244 ) 12,826 23,824 Gain (loss) on foreign currency translation (3,895 ) 2,911 (2,151 ) Gain (loss) on disposal 138 35 (81 ) Loss on valuation (140,474 ) (110,286 ) (132,102 ) Financial assets at fair value through profit or loss Interest income 1 6,548 3,673 6,008 Dividend income 5 4,379 21,499 4,600 Gain (loss) on valuation 6 59,044 64,659 (29,282 ) Gain (loss) on disposal (329 ) 29,974 2,347 Gain (loss) on foreign currency transactions 4 (38 ) — 1,100 Gain on foreign currency translation — 17,794 13,711 Financial assets at fair value through other comprehensive income Interest income 1 227,736 222,290 190,281 Dividend income 5 56 1,365 9,522 Loss on valuation — — (61 ) Loss on disposal (8,152 ) (22,712 ) (62,183 ) Other comprehensive income (loss) for the year 2 41,997 129,780 (158,574 ) Derivatives Gain on transactions 6,050 — 27,628 Loss (gain) on valuation 7 (2,707 ) 203,961 150,699 Other comprehensive income (loss) for the year 2 (2,373 ) 144,967 88,048 Reclassified to profit or loss from other comprehensive income (loss) for the year 2,3 3,645 (143,305 ) (110,616 ) Financial liabilities at fair value through profit or loss Gain on valuation 119 42,447 30,031 Gain on disposal 799 2,136 — Interest expense 1 — — (4,046 ) Gain (loss) on foreign currency transactions 4 — (2 ) 24 Derivatives used for hedging Gain (loss) on transactions 1,141 (6,208 ) (1,291 ) Loss on valuation (161,003 ) (7,206 ) (17,237 ) Other comprehensive loss for the year 2 (81,671 ) (3,112 ) (23,957 ) Reclassified to profit or loss from other comprehensive income for the year 2,3 107,786 6,722 15,195 Financial liabilities at amortized cost Interest expense 1 (220,945 ) (232,197 ) (275,302 ) Loss on foreign currency transactions 4 (10,717 ) (3,580 ) (34,574 ) Gain (loss) on foreign currency translation 141,849 (201,623 ) (168,577 ) Lease liabilities Interest expense 1 (44,091 ) (36,650 ) (41,469 ) Total ￦ (38,610 ) ￦ 215,095 ￦ (353,980 ) 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 ￦ million (2020: ￦20,854 million, 2021: ￦ ￦ million (2020: ￦1,456 million, 2021: ￦ 2 The amounts directly reflected in equity after adjustments of deferred income tax. 3 During the current and previous year, certain derivatives of the Group was 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 ￦ million (2020: transaction loss ￦19,687 million, 2021 foreign exchange gain and loss: ￦ 5 BC Card Co., Ltd., a subsidiary of the Group, recognized dividend income as operating revenue. Related dividend income recognized as operating revenue is ￦ million (2020: ￦2,059 million, 2021: ￦ 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 ￦ million (2020: valuation gain ￦40,822 million, 2021 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 and loss recognized as operating revenue and expense is ￦

Cash and Cash Equivalents (Tabl

Cash and Cash Equivalents (Tables)	12 Months Ended
	Dec. 31, 2022
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Summary of Restricted Cash and Cash Equivalents	Restricted cash and cash equivalents as at December 31, 2021 and 2022, are as follows: ( i 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, 2022
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Summary of Trade and Other Receivables	Trade and other receivables as at December 31, 2021 and 2022, are as follows: December 31, 2021 ( i Total Provision Present value Carrying amount Current assets Trade receivables ￦ 3,337,398 ￦ (346,869 ) ￦ (7,662 ) ￦ 2,982,867 Other receivables 2,201,781 (93,256 ) (3,902 ) 2,104,623 Total ￦ 5,539,179 ￦ (440,125 ) ￦ (11,564 ) ￦ 5,087,490 Non-current assets Trade receivables ￦ 612,654 ￦ (2,856 ) ￦ (17,351 ) ￦ 592,447 Other receivables 621,195 (108,131 ) (14,185 ) 498,879 Total ￦ 1,233,849 ￦ (110,987 ) ￦ (31,536 ) ￦ 1,091,326 December 31, 2022 ( i 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
Summary of Changes in Provision for Impairment	Details of changes in provision for impairment for the years ended December 31, 2021 and 2022, are as follows: 2021 2022 (in millions of Korean won) Trade Other Trade Other Beginning balance ￦ 327,315 ￦ 204,604 ￦ 349,725 ￦ 201,387 Provision 82,329 23,015 64,522 65,941 Reversal — (508 ) — (850 ) Write-off/transfer (62,564 ) (25,900 ) (69,430 ) (49,904 ) Changes in consolidation scope 416 (300 ) (43 ) — Others 2,229 476 (1,036 ) 1,969 Ending balance ￦ 349,725 ￦ 201,387 ￦ 343,738 ￦ 218,543
Summary of Other Receivables	Details of other receivables as at December 31, 2021 and 2022, are as follows: ( i December 31, 2021 December 31, 2022 Loans ￦ 101,718 ￦ 98,953 Receivables 1 1,872,467 2,668,545 Accrued income 5,933 32,218 Refundable deposits 349,360 339,450 Loans receivable 328,753 1,013,428 Finance lease receivables 85,370 105,690 Others 61,288 63,941 Less: Provision for impairment (201,387 ) (218,543 ) ￦ 2,603,502 ￦ 4,103,682 1 The settlement receivables of BC Card Co., Ltd. amounting to ￦ ￦ The maximum exposure of trade and other receivables to credit risk is the carrying amount of each class of receivables mentioned above as at December 31, 2022. A portion of the trade receivables is classified as financial assets at 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 Li_2

Other Financial Assets and Liabilities (Tables)	12 Months Ended
	Dec. 31, 2022
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Summary of Other Financial Assets and Liabilities	Details of other financial assets and liabilities as at December 31, 2021 and 2022, are as follows: ( i December 31, 2021 December 31, 2022 Other financial assets Financial assets at amortized cost 1 ￦ 608,389 ￦ 1,060,058 Financial assets at fair value through profit or loss 1,2 952,319 1,064,856 Financial assets at fair value through other comprehensive income 1 347,877 1,508,192 Derivatives used for hedging 99,453 190,830 Less: Non-current (822,379 ) (2,501,484 ) Current ￦ 1,185,659 ￦ 1,322,452 Other financial liabilities Financial liabilities at amortized cost 3 ￦ 263,500 ￦ 246,606 Financial liabilities at fair value through profit or loss 216,040 141,280 Derivatives used for hedging 18,126 33,555 Less: Non-current (424,859 ) (412,650 ) Current ￦ 72,807 ￦ 8,791 1 As at December 31, 2022, the Group’s other financial assets amounting to ￦ ￦ 2 As at December 31, 2022, 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. (Note 20).
Summary of Financial Assets at Fair Value Through Profit or Loss	Details of financial assets at fair value through profit or loss as at December 31, 2021 and 2022, are as follows: ( i December 31, 2021 December 31, 2022 Equity Instruments (Listed) ￦ 24,285 ￦ 26,647 Equity Instruments (Unlisted) 64,835 72,517 Debt securities 862,481 942,274 Derivatives held for trading 1 718 23,418 Total 952,319 1,064,856 Less: non-current (488,040 ) (609,887 ) Current ￦ 464,279 ￦ 454,969 1 During the year ended December 31, 2022, derivative assets amount to ￦ 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 at December 31, 2022.
Summary of Financial Assets at Fair Value Through Other Comprehensive Income	Details of financial assets at fair value through other comprehensive income as at December 31, 2021 and 2022, are as follows: ( i December 31, 2021 December 31, 2022 Equity Instruments (Listed) 1 ￦ 19,079 ￦ 1,006,476 Equity Instruments (Unlisted) 234,048 496,284 Debt securities 94,750 5,432 Total 347,877 1,508,192 Less: non-current (259,435 ) (1,508,192 ) Current ￦ 88,442 ￦ — 1 As at December 31, 2022, financial assets at fair value through other comprehensive income include shares of Shinhan Financial Group Co., Ltd., HYUNDAI MOBIS, and HYUNDAI MOTOR COMPANY.
Summary of Derivative Financial Assets and Liabilities	Details of valuation of derivatives December 31, 2021 December 31, 2022 ( i Assets Liabilities Assets Liabilities Interest rate swap 1, 3 ￦ — ￦ 77 ￦ 4,236 ￦ — Currency swap 2, 3 99,453 18,049 186,594 33,555 Total 99,453 18,126 190,830 33,555 Less: non-current (67,889 ) (242 ) (147,141 ) (33,555 ) Current ￦ 31,564 ￦ 17,884 ￦ 43,689 ￦ — 1 The interest rate swap contract is to hedge the risk of variability in future fair value of the borrowings. 2 The currency swap contract is to hedge the risk of variability in cash flow from the borrowings. In applying the cash flow hedge accounting, the Group hedges its exposures to cash flow fluctuation until September 7, 2034. 3 The amount of derivatives subject to the second phase of interest rate indicator reform is assets ￦ ￦
Summary of Valuation Gains and Losses on Derivatives Contracts	The valuation gains and losses on the derivatives contracts for the years ended December 31, 2020, 2021 and 2022, are as follows: ( i 2020 2021 2022 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 ￦ — ￦ — ￦ (567 ) ￦ — ￦ — ￦ 1 ￦ 63 ￦ 490 ￦ 4,666 Currency swap — 161,661 (113,175 ) 203,961 7,206 191,569 154,611 20,723 79,781 Currency forwards — 2,049 — — — — — — 754 Total ￦ — ￦ 163,710 ￦ (113,742 ) ￦ 203,961 ￦ 7,206 ￦ 191,570 ￦ 154,674 ￦ 21,213 ￦ 85,201 1 The amounts directly reflected in equity are
Summary of Financial Liabilities at Fair Value Through Profit or Loss	Details of financial liabilities at fair value through profit or loss as at December 31, 2021 and 2022, are as follows: ( i December 31, 2021 December 31, 2022 Derivatives held for trading 1,2,3 ￦ 216,040 ￦ 141,280 1 The Group signed a shareholder-to-share agreement with financial investors participating in the paid-in capital increase of K Bank Inc. for the year period ended December 31, 2021. According to the Drag-Along Right, if K Bank Inc. fails to be listed on the terms agreed upon for the date of completion of the acquisition, financial investors may exercise the Drag-Along right to the Group, and the Group may comply or exercise the right to claim for sale. If financial investors exercise the Drag-Along Right, the Group must exercise the right to claim for sale or guarantee the return on the terms agreed upon by financial investors. 2 The amount includes derivatives for convertible bonds issued by the Group (Note 16). 3 During the year ended December 31, 2022, derivative liabilities recognized amount to ￦
Summary of Valuation Gain and Loss on Financial Liabilities at Fair Value Through Profit or Loss	The valuation gain and loss on financial liabilities at fair value through profit or loss for the years ended December 31, 2020, 2021 and 2022, are as follows: 2020 2021 2022 ( i Valuation gain Valuation loss Valuation gain Valuation loss Valuation gain Valuation loss Derivatives held for trading ￦ 172 ￦ 53 ￦ 51,187 ￦ 8,741 ￦ 24,683 ￦ 1,800
Summary of Hedging instruments	(i) Hedging instruments ( i and thousands of foreign currencies) 2021 Book value of hedging Changes in fair Currency Foreign Contract Assets Liabilities USD 2,016,350 ￦ 2,322,085 ￦ 93,948 ￦ 77 ￦ 186,130 JPY 30,000,000 326,751 — 18,049 (7,199 ) SGD 284,000 245,208 5,431 — 18,387 EUR 7,700 10,283 74 — 51 Total ￦ 2,904,327 ￦ 99,453 ￦ 18,126 ￦ 197,369 ( i 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
Summary of Hedged items	(ii) Hedged item ( i 2021 2022 Currency Book value Changes in fair Cash flow 1 Book value Changes in fair Cash flow 1 USD ￦ 2,401,943 ￦ (177,120 ) ￦ 21,826 ￦ 2,675,885 ￦ (170,010 ) ￦ (13,947 ) JPY 309,072 7,199 269 3,813 308 116 SGD 249,108 (15,570 ) 3,071 267,843 (18,720 ) 3,406 EUR 10,336 (53 ) 18 10,404 (121 ) 582 KRW — — — 101,035 (4,655 ) 4,385 Total ￦ 2,970,459 ￦ (185,544 ) ￦ 25,184 ￦ 3,058,980 ￦ (193,198 ) ￦ (5,458 ) 1 The amount is after the deferred tax directly added or subtracted to the capital is reflected.

Inventories (Tables)

Inventories (Tables)	12 Months Ended
	Dec. 31, 2022
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Summary of Inventories Net	Inventories as at December 31, 2021 and 2022, are as follows: December 31, 2021 December 31, 2022 ( i Acquisition Valuation Book amount Acquisition cost Valuation Allowance Book amount Merchandise ￦ 601,360 ￦ (120,304 ) ￦ 481,056 ￦ 768,748 ￦ (96,010 ) ￦ 672,738 Others 33,089 — 33,089 44,935 — 44,935 Total ￦ 634,449 ￦ (120,304 ) ￦ 514,145 ￦ 813,683 ￦ (96,010 ) ￦ 717,673

Other Assets and Liabilities (T

Other Assets and Liabilities (Tables)	12 Months Ended
	Dec. 31, 2022
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Summary of Other Assets and Liabilities	Other assets and liabilities as at December 31, 2021 and 2022, are as follows: ( i December 31, 2021 December 31, 2022 Other assets Advance payments ￦ 151,266 ￦ 181,150 Prepaid expenses 100,697 107,775 Contract cost 1,801,244 1,817,678 Contract assets 745,085 802,253 Others 22,212 12,964 Less: Non-current (776,363 ) (820,608 ) Current ￦ 2,044,323 ￦ 2,101,212 Other liabilities Advances received 1 ￦ 372,375 ￦ 387,986 Withholdings 135,160 155,017 Unearned revenue 1 35,577 46,493 Lease liabilities 1,159,369 1,172,038 Contract liabilities 323,651 284,107 Others 25,757 33,108 Less: Non-current (927,596 ) (945,731 ) Current ￦ 1,124,293 ￦ 1,133,018 1 The amounts include adjustments arising from adoption of IFRS 15 R evenue from Contracts with Customers

Property and Equipment (Tables)

Property and Equipment (Tables)	12 Months Ended
	Dec. 31, 2022
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Summary of Changes in Property and Equipment	Changes in property and equipment for the years ended December 31, 2021 and 2022, are as follows: 2021 ( i Land Buildings Machinery Others Construction- Total Acquisition cost ￦ 1,334,759 ￦ 4,402,691 ￦ 39,182,265 ￦ 1,619,822 ￦ 1,046,795 ￦ 47,586,332 Less: Accumulated depreciation (including accumulated impairment loss and others) (132 ) (2,094,669 ) (29,867,282 ) (1,414,170 ) (3,960 ) (33,380,213 ) Beginning, net 1,334,627 2,308,022 9,314,983 205,652 1,042,835 14,206,119 Acquisition and capital expenditure 60,817 36,446 28,159 55,336 2,947,335 3,128,093 Disposal and termination (45,318 ) (11,827 ) (76,676 ) (6,868 ) (64 ) (140,753 ) Depreciation — (145,954 ) (2,368,679 ) (81,507 ) — (2,596,140 ) Impairment — — (2,075 ) (40 ) — (2,115 ) Transfer in (out) 4,608 415,771 2,340,948 27,051 (2,872,257 ) (83,879 ) Transfer from (to) investment properties (59,848 ) (73,096 ) — — — (132,944 ) Changes in scope of consolidation 20,911 6,355 67,925 15,583 497 111,271 Others — (18,295 ) 11,986 6,031 (24,488 ) (24,766 ) Ending, net ￦ 1,315,797 ￦ 2,517,422 ￦ 9,316,571 ￦ 221,238 ￦ 1,093,858 ￦ 14,464,886 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 ) 2022 ( i 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) 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 ) Changes in scope of consolidation — — (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 )
Summary of the Details of Property and Equipment Provided	Details of property and equipment provided as collateral as at December 31, 2021 and 2022, are as follows: (in millions of Korean won) December 31, 2021 Carrying Secured Related line Related Secured party Land and Buildings ￦ 11,320 ￦ 15,412 Borrowings ￦ 3,272 Industrial Korea ( i December 31, 2022 Carrying Secured Related line Related Secured party Land and Buildings ￦ 11,353 ￦ 15,774 Borrowings ￦ 3,228 Industrial Korea

Investment Properties (Tables)

Investment Properties (Tables)	12 Months Ended
	Dec. 31, 2022
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Summary of Investment Properties	Changes in investment properties for the years ended December 31, 2021 and 2022, are as follows: ( i 2021 Land Buildings Construction- Total Acquisition cost ￦ 539,903 ￦ 1,341,326 ￦ 46,547 ￦ 1,927,776 Less: Accumulated depreciation (1,568 ) (557,755 ) — (559,323 ) Beginning, net ￦ 538,335 ￦ 783,571 ￦ 46,547 ￦ 1,368,453 Acquisition 171,872 42,151 56,351 270,374 Disposal and termination (17,133 ) (4,862 ) — (21,995 ) Depreciation — (47,754 ) — (47,754 ) Transfer from(to) property and equipment 59,848 73,096 — 132,944 Changes in scope of consolidation 5,262 1,779 — 7,041 Transfer and others 55,579 (7,891 ) (36,097 ) 11,591 Ending, net ￦ 813,763 ￦ 840,090 ￦ 66,801 ￦ 1,720,654 Acquisition cost ￦ 815,331 ￦ 1,424,066 ￦ 66,801 ￦ 2,306,198 Less: Accumulated depreciation (1,568 ) (583,976 ) — (585,544 ) ( i 2022 Land Buildings Construction- 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 Changes in consolidation scope 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 )
Summary of Investment Properties Provided as Collateral	Details of investment properties provided as collateral as at December 31, 2021 and 2022, are as follows: ( i December 31, 2021 Carrying Secured Related Related Land and Buildings ￦ 828,103 ￦ 72,910 Deposits ￦ 63,012 Land and Buildings ￦ 2,883 ￦ 3,688 Borrowings ￦ 2,728 ( i December 31, 2022 Carrying Secured Related Related Land and Buildings ￦ 460,166 ￦ 61,733 Deposits ￦ 52,662 Land and Buildings ￦ 2,546 ￦ 3,326 Borrowings ￦ 2,772

Intangible Assets (Tables)

Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2022
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Summary of Intangible Assets	Changes in intangible assets for the years ended December 31, 2021 and 2022, are as follows: 2021 ( i Goodwill Development Software Frequency usage rights Others 1 Total Acquisition cost ￦ 536,093 ￦ 1,767,422 ￦ 1,053,980 ￦ 3,373,095 ￦ 1,167,735 ￦ 7,898,325 Less: Accumulated amortization (including accumulated impairment loss and others) (306,008 ) (1,486,423 ) (907,980 ) (2,212,432 ) (824,224 ) (5,737,067 ) Beginning, net ￦ 230,085 ￦ 280,999 ￦ 146,000 ￦ 1,160,663 ￦ 343,511 ￦ 2,161,258 Acquisition and capital expenditure 467,394 38,113 36,437 1,065,096 113,579 1,720,619 Disposal and termination — (7,893 ) (506 ) (276 ) (5,108 ) (13,783 ) Amortization — (92,230 ) (52,547 ) (386,741 ) (73,226 ) (604,744 ) Impairment — (216 ) (316 ) — (3,216 ) (3,748 ) Changes in scope of consolidation (607 ) 8,640 (4,548 ) — 152,768 156,253 Others — 960 14,905 389 15,224 31,478 Ending, net 696,872 228,373 139,425 1,839,131 543,532 3,447,333 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 ) 2022 ( i 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 ) Changes in scope of consolidation — (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 )
Summary of Goodwill Allocated to Each Cash-Generation Unit	Goodwill is allocated to the Group’s cash-generating unit which is identified ( i Cash generating Unit Amount Mobile services 1,9 ￦ 65,057 BC Card Co., Ltd. 2 41,234 HCN Co., Ltd. 3 228,674 GENIE Music Corporation 4 50,214 MILLIE Co., Ltd. 5 54,725 PlayD Co., Ltd. 6 42,745 KT Telecop Co., Ltd. 7 15,418 Epsilon Global Communications Pte. Ltd. 8 160,033 KT MOS Bukbu Co., Ltd and others 50,123 Total ￦ 708,223 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 1.13% 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 8.48% 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 mobile business for the years ended December 31, 2020, 2021 and 2022. 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 1.57% 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 5.32% 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, 2020, 2021 and 2022. 3 The recoverable amounts ive ive In addition, management estimated the cash flow based on past performance and its expectation of market growth, and the discount rates 10.14% used reflected specific risks relating to the relevant CGU. As a result of the impairment test, HCN’s recoverable amount was KRW 228,674 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 f ive ive 5 The recoverable amounts of MILLIE Co., Ltd. Co., Ltd. 6 The recoverable amounts of PlayD Co., Ltd. are calculated based on value-in use calculations. These calculations use discounted cash flow projections for the next f ive ive 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 3.05% 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 10.23% 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, 2020, 2021 and 2022. 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 12.10% 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 9.74% 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 Epsilon Global Communications Pte. Ltd. for the years ended December 31, 2022. 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 1.13% ~ 4.31% 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 8.48%. Accordingly, the Group did not recognize an impairment loss on ICT reporting segment for the years ended December 31, 2020, 2021 and 2022.

Investments in Associates and_2

Investments in Associates and Joint Ventures (Tables)	12 Months Ended
	Dec. 31, 2022
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Summary of Details of Associates	Details of associates that are material to the Group as at December 31, 2021 and 2022, are as follows: Percentage of ownership (%) Location Closing December 31, 2021 December 31, 2022 KIF Investment Fund 33.3 % 33.3 % Korea December K Bank Inc. 33.7 % 33.7 % Korea December Hyundai Robotics Co., Ltd. 1 10.0 % 10.0 % Korea December Megazone Cloud Corporation 1 — 6.8 % Korea December IGIS No. 468-1 General Private Real Estate Investment Company — 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 LLC No. 35.3 % 35.3 % Korea December 1 As at December 31, 2022, although the Group has less than 20% ownership in ordinary share, this entity is included in investments in associates as the Group has significant influence in determining the operational and financial policies.
Summary of Changes in Investments in Associates and Joint Ventures	Changes in investments in associates and joint ventures for the years ended December 31, 2021 and 2022, are as follows: 2021 ( i Beginning Acquisition (Disposal) Share of net profit 1 Others Ending KIF Investment Fund ￦ 170,155 ￦ — ￦ 16,702 ￦ (7,922 ) ￦ 178,935 KT-IBKC Future Investment Fund 1 16,190 (5,700 ) 1,591 — 12,081 K Bank Inc. 2 208,272 424,957 5,809 192,699 831,737 Hyundai Robotics Co., Ltd. 50,936 — (2,373 ) 162 48,725 K-REALTY CR REITs No.1 31,088 — 75,676 (39,106 ) 67,658 Others 1 81,240 57,691 18,769 (8,407 ) 149,293 ￦ 557,881 ￦ 476,948 ￦ 116,174 ￦ 137,426 ￦ 1,288,429 2022 ( i Beginning Acquisition (Disposal) Share of net profit 1 Others Ending KIF Investment Fund ￦ 178,935 ￦ — ￦ 2,502 ￦ (10,458 ) ￦ 170,979 K Bank Inc. 831,737 — 29,010 (7,991 ) 852,756 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 . 17,084 — (464 ) — 16,620 Others 1 189,810 100,040 (24,688 ) (56,078 ) 209,084 ￦ 1,288,429 ￦ 255,041 ￦ (16,821 ) ￦ (45,927) ￦ 1,480,722 1 KT investment Co., Ltd., a subsidiary of the Group, recognized its share in net profit from associates and joint ventures as operating revenue and expense. These include its share in net gain from associates and joint ventures of ￦ ￦ ￦ 2 During the year ended December 31, 2021, the amount increased due to the settlement of derivative liabilities, resulting from a shareholder agreement among financial investors participating in the paid-in capital increase of K-Bank Inc.
Summary of Financial Information of Associates and Joint Ventures	Summarized financial information of associates and joint ventures as at and for the years ended December 31, 2021 and 2022, is as follows: ( i December 31, 2021 Current Non-current assets Current Non-current liabilities KIF Investment Fund ￦ 117,172 ￦ 419,632 ￦ — ￦ — KT-IBKC Future Investment Fund 1 24,163 — — — K Bank Inc. 13,263,658 70,362 11,594,316 2,467 Hyundai Robotics Co., Ltd. 308,776 120,221 91,637 57,899 K-REALTY CR REITs No.1 208,825 — — — (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 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 — ( i 2021 Operating Profit (loss) Other Total Dividends KIF Investment Fund ￦ 58,791 ￦ 50,107 ￦ (6,847 ) ￦ 43,260 ￦ 5,640 KT-IBKC Future Investment Fund 1 5,912 3,184 — 3,184 — K Bank Inc. 287,775 21,728 (28,211 ) (6,483 ) — Hyundai Robotics Co., Ltd. 189,255 (23,730 ) 1,977 (21,753 ) — K-REALTY CR REITs No.1 425,363 180,437 — 180,437 40,142 ( i 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 — 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 . — (474 ) — (474 ) —
Summary of Reconciliation of Carrying Amount of Interests in the Associates and Joint Ventures	Details of a reconciliation of the summarized financial information to the carrying amount of interests in the associates and joint ventures that are material to the Group as at and for the years end December 31, 2021 and 2022, are as follows: ( i 2021 Net assets (a) Percentage of (b) Share in net (c)=(a)x(b) Intercompany Book amount (c)+(d) KIF Investment Fund ￦ 536,804 33.33 % ￦ 178,935 ￦ — ￦ 178,935 KT-IBKC Future Investment Fund 1 24,163 50.00 % 12,081 — 12,081 K Bank Inc. 1,737,237 33.72 % 585,837 245,900 831,737 Hyundai Robotics Co., Ltd. 279,461 10.00 % 27,946 20,779 48,725 K-REALTY CR REITs No.1 208,825 30.05 % 62,752 4,906 67,658 (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 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 . 46,120 35.29 % 16,278 342 16,620

Trade and Other Payables (Table

Trade and Other Payables (Tables)	12 Months Ended
	Dec. 31, 2022
Text block [abstract]
Summary of Trade and Other Payables	Details of trade and other payables as at December 31, 2021 and 2022 ( i December 31, December 31, Current liabilities Trade payables ￦ 1,537,148 ￦ 1,150,515 Other payables 5,104,274 6,182,650 Total ￦ 6,641,422 ￦ 7,333,165 Non-current liabilities Other payables ￦ 1,338,781 ￦ 1,064,099 Total ￦ 1,338,781 ￦ 1,064,099
Summary of Other Payables	Details of other payables as at December 31, 2021 and 2022 are as follows: ( i December 31, December 31, Non-trade payables 1 ￦ 4,378,445 ￦ 4,981,300 Accrued expenses 1,037,616 1,234,023 Operating deposits 814,613 818,603 Others 212,381 212,823 Less: non-current (1,338,781 ) (1,064,099 ) Current ￦ 5,104,274 ￦ 6,182,650 1 Settlement payables of BC Card Co., Ltd., a subsidiary of the Group, of ￦ related ￦ million

Borrowings (Tables)

Borrowings (Tables)	12 Months Ended
	Dec. 31, 2022
Text block [abstract]
Summary of Borrowings	Debentures ( i December 31, 2021 December 31, 2022 Type Maturity Annual interest Foreign Korean Foreign Korean MTNP notes 1 Sep. 7, 2034 6.500% USD 100,000 ￦ 118,550 USD 100,000 ￦ 126,730 MTNP notes Jul. 18, 2026 2.500% USD 400,000 474,200 USD 400,000 506,920 MTNP notes Aug. 7, 2022 — USD 400,000 474,200 — — FR notes 2 Aug. 23, 2023 LIBOR(3M)+0.900% USD 100,000 118,550 USD 100,000 126,730 MTNP notes Jul. 19, 2022 — JPY 29,600,000 304,951 — — MTNP notes Jul. 19, 2024 0.330% JPY 400,000 4,121 JPY 400,000 3,813 MTNP notes Sep. 1, 2025 1.000% USD 400,000 474,200 USD 400,000 506,920 FR notes 2 Nov. 1, 2024 LIBOR(3M)+0.980% USD 350,000 414,925 USD 350,000 443,555 FR notes 2 Jun. 19, 2023 SOR(6M)+0.500% SGD 284,000 249,108 SGD 284,000 267,843 MTNP notes Jan. 21, 2027 1.375% USD 300,000 355,650 USD 300,000 380,190 MTNP notes Aug. 08, 2025 4.000% — — USD 500,000 633,650 The 183-3rd Public bond Dec. 22, 2031 4.270% — 160,000 — 160,000 The 184-2nd Public bond Apr. 10, 2023 2.950% — 190,000 — 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 2.749% — 150,000 — 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 191-1st Public bond Jan. 14, 2022 — — 220,000 — — 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 192-1st Public bond Oct. 11, 2022 — — 340,000 — — 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 1.174 % — 150,000 — 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 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 The 196-2nd Public bond Jan. 27, 2027 2.637 % — — — 100,000 The 196-3rd Public bond Jan. 27, 2032 2.741 % — — — 30,000 (in millions of Korean won and thousands of foreign currencies) December 31, 2021 December 31, 2022 Type Maturity Annual interest Foreign Korean Foreign Korean The 197-1st Public bond Jun. 27, 2025 4.191% — — — 280,000 The 197-2nd Public bond Jun. 29, 2027 4.188% — — — 120,000 The 18-1st Won-denominated unsecured bond Jul. 2, 2024 1.844% — 100,000 — 100,000 The 18-2nd Won-denominated unsecured bond Jul. 2, 2026 2.224% — 50,000 — 50,000 The 148th Won-denominated unsecured bond Jun. 23, 2023 1.513% — 100,000 — 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 1.154% — 20,000 — 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 1.191% — 10,000 — 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 2.310% — 30,000 — 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 The 155-2nd Won-denominated unsecured bond Sep. 2, 2024 2.745% — — — 20,000 The 155-3rd Won-denominated unsecured bond Feb. 28, 2025 2.880% — — — 20,000 The 156-1st Won-denominated unsecured bond 3 Mar. 25, 2025 5Y CMS+0.404 % — — — 60,000 The 156-2nd Won-denominated unsecured bond 3 Mar. 25, 2032 10Y CMS+0.965 % — — — 40,000 The 157-1st Won-denominated unsecured bond Apr. 28, 2023 2.588 % — — — 30,000 The 157-2nd Won-denominated unsecured bond Oct. 27, 2023 3.024 % — — — 30,000 The 158th Won-denominated unsecured bond Jan. 27, 2025 4.421 % — — — 50,000 The 159-1st Won-denominated unsecured bond Aug. 09, 2024 4.267 % — — — 30,000 The 159-2nd Won-denominated unsecured bond Aug. 11, 2027 4.505 % — — — 30,000 The 160-1st Won-denominated unsecured bond Jun. 14, 2024 5.615 % — — — 20,000 The 160-2nd Won-denominated unsecured bond Dec. 13, 2024 5.667 % — — — 20,000 (in millions of Korean won and thousands of foreign currencies) December 31, 2021 December 31, 2022 Type Maturity Annual interest Foreign Korean Foreign Korean The 160-3rd Won-denominated unsecured bond Dec. 12, 2025 5.769% — — — 30,000 The 161-1st Won-denominated unsecured bond Jun. 21, 2024 5.527% — — — 10,000 The 161-2nd Won-denominated unsecured bond Dec. 20, 2024 5.557% — — — 20,000 The 161-3rd Won-denominated unsecured bond Jun. 20, 2025 5.594% — — — 30,000 The 161-4th Won-denominated unsecured bond Dec. 22, 2025 5.615% — — — 10,000 The 162-1st Won-denominated unsecured bond Dec. 27, 2023 5.066% — — — 50,000 The 162-2nd Won-denominated unsecured bond Jan. 26, 2024 5.069% — — — 40,000 The 162-3rd Won-denominated unsecured bond Apr. 26, 2024 5.080% — — — 10,000 Subtotal 7,558,455 8,406,351 Less: Current portion (1,337,714 ) (1,154,101 ) Discount on bonds (22,093 ) (23,728 ) Total ￦ 6,198,648 ￦ 7,228,522 1 As at December 31, 2022, the Group has outstanding notes in the amount of USD 2,000 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 100 million. However, the MTNP has been terminated since 2007. 2 The Libor (3M) and SOR (6M) is approximately 4.767% and 4.429%, respectively as at December 31, 2022. The loan has not been converted to an alternative indicator interest rate, and the Group is assessing the impact of switching to an alternative indicator interest rate as of December 31, 2022. 2 The CMS (5Y) and CMS (10Y) is approximately 3.588% and 3.490%, respectively as at December 31, 2022. The loan has not been converted to an alternative indicator interest rate.
Summary of Korean Won and Foreign Currency Borrowings	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 4 — 30,000 Redemption premium 2,267 4,565 Bond discount issuance (3,825 ) (7,206 ) Subtotal 6,442 35,359 Current portion — — Total ￦ 6,442 ￦ 35,359 1 Common shares of Storywiz are subject to conversion (appraisal period 2 Nominal interest rate and maturity yield is approximately 0% and 5%, respectively, and will be settled on maturity. 3 Common shares of KT cloud are subject to conversion (appraisal period: July 27, 2022~December 25, 2024). 4 Nominal interest rate and maturity yield is approximately 0% and 3%, respectively, and the sum of principal and interest will be settled on maturity.
Summary of Short-term Borrowings	Short-term borrowings (in millions of Korean won) December 31, 2021 December 31, 2022 Type Financial institution Annual interest rates Foreign Korean Foreign Korean Operational Shinhan Bank 1 3.840%~6.440% — ￦ 4,500 — ￦ 105,000 CD(91D)+1.750% — — — 30,000 Woori Bank 1,2 KORIBOR(3M)+1.960 — 20,000 — 20,000 CD(91D)+1.430 — — — 30,000 Korea Development Bank 4.630 6.200 — 16,000 — 27,201 Industrial Bank of Korea 4.880 — 6,000 — 6,000 Hana Bank 1 CD(91D)-0.020 — 5,000 — 5,000 KB SECURITIES 5.904 — 71,000 — 94,822 Shinhan Investment — — 73,000 — — KIWOOM Securities — — 63,000 — — NH INVESTMENT & SECURITIES 5.070 — 53,000 — 20,000 Korea Investment & Securities — — 10,000 — — HSBC 5.090 USD 14,700 17,427 USD 18,500 23,451 NongHyup Bank 2 4.690 4.940 — — — 9,000 COFIX(6M)+1.780 — — — 15,000 IBK Securities 5.070 — — — 20,000 Hi Investment & Securities and others 3.710 — — — 99,524 Total ￦ 338,927 ￦ 504,998 1 CD (91D) is approximately 3.980% as at December 31, 2022. 2 KORIBOR (3M) and COFIX (6M) are approximately 4.040% and 4.340%, respectively, as at December 31, 2022.
Summary of Long-term Borrowings	Long-term borrowings (in millions of Korean won and thousands of foreign currencies) December 31, 2021 December 31, 2022 Financial institution Type Annual interest rates Foreign currency Korean Foreign Korean won Export-Import Bank of Korea Inter-Korean Cooperation Fund 1 1.000% — ￦ 2,467 — ￦ 1,974 CA-CIB Long-term CP 1.260%~3.380% — 100,000 — 200,000 JPM Long-term CP 2.700 — — — 100,000 DBS Long-term CP 4.109% — — — 100,000 Shinhan Bank General loans — USD 25,918 30,726 — — General loans 2 LIBOR(3M)+1.650 USD 8,910 10,563 USD 8,910 11,292 General loans 2 LIBOR(3M)+1.847 USD 13,000 15,412 USD 13,000 16,475 General loans 2 LIBOR(3M)+2.130 USD 25,000 29,638 USD 25,000 31,683 General loans 1.900%~3.230 USD 31,472 37,345 USD 31,472 39,855 General loans 3 4.490 — — — 62,398 General loans 2 Term — — USD 21,127 26,774 Woori Bank General loans 2 EURIBOR(3M)+0.900% EUR 7,700 10,336 EUR 7,700 10,404 General loans 3.320% — 15,000 — 15,000 PF loans 2.000%~3.470% — 23,614 — 40,682 Hi Investment & Securities and others CP 2.302%~3.622% — 88,510 — 182,569 Korea Development Bank General loans 3.000%~3.610% — 39,000 — 38,000 NH Jayang PF loans 2 CD(91D)+1.150 — 46,267 — 59,066 Kyobo Life Insurance PF loans 2 CD(91D)+1.150%~3.450% — 41,640 — 66,390 Standard Chartered Bank Korea PF loans 2 CD(91D)+1.150%~3.450% — 27,760 — 44,260 Samsung Life Insurance PF loans 1.860%~4.160% — 23,133 — 36,883 Kookmin Bank and others Facility loans — USD 9,771 11,584 — — Subtotal 552,995 1,083,705 Less: Current portion (51,803 ) (167,943 ) ￦ 501,192 ￦ 915,762 1 The above Inter-Korean Cooperation Fund is repayable in installments over 13 years after a seven-year grace period. 2 LIBOR (3M), EURIBOR (3M), Term SOFR (3M) and CD (91D) are approximately 4.767%, 2.132%, 4.587% and 3.980%, respectively, as at December 31, 2022. 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	Repayment schedule of the Group’s debentures and (in millions of Korean won) Bonds Borrowings Total In local In foreign Sub- total In local In foreign Sub- total Jan. 1, 2023~Dec. 31, 2023 ￦ 760,000 ￦ 394,573 ￦ 1,154,573 ￦ 590,040 ￦ 82,900 ￦ 672,940 ￦ 1,827,513 Jan. 1, 2024~Dec. 31, 2024 1,380,000 447,368 1,827,368 455,899 51,687 507,586 2,334,954 Jan. 1, 2025~Dec. 31, 2025 1,138,000 1,140,570 2,278,570 182,432 — 182,432 2,461,002 Jan. 1, 2026~Dec. 31, 2026 420,000 506,920 926,920 111,817 — 111,817 1,038,737 After Jan. 1, 2027 1,750,000 506,920 2,256,920 88,581 25,346 113,927 2,370,847 Total ￦ 5,448,000 ￦ 2,996,351 ￦ 8,444,351 ￦ 1,428,769 ￦ 159,933 ￦ 1,588,702 ￦ 10,033,053

Provisions (Tables)

Provisions (Tables)	12 Months Ended
	Dec. 31, 2022
Text block [abstract]
Summary of Changes in Provisions	Changes in provisions for the years ended December 31, 2021 and 2022, are as follows: 2021 ( i Litigation Restoration cost Others Total Beginning balance ￦ 76,500 ￦ 105,767 ￦ 69,925 ￦ 252,192 Increase (Transfer) 6,288 6,772 19,835 32,895 Usage (2,599 ) (2,776 ) (1,926 ) (7,301 ) Reversal (24 ) (3,685 ) (19,188 ) (22,897 ) Scope change — 1,086 1,228 2,314 Others — 194 — 194 Ending balance ￦ 80,165 ￦ 107,358 ￦ 69,874 ￦ 257,397 Current ￦ 79,947 ￦ 26,026 ￦ 65,343 ￦ 171,316 Non-current 218 81,332 4,531 86,081 2022 ( i 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

Net Defined Benefit Liabiliti_2

Net Defined Benefit Liabilities (Tables)	12 Months Ended
	Dec. 31, 2022
Statement [LineItems]
Summary of Amount Recognized in the Statements of Financial Position and Defined Benefit Obligations	The amounts recognized in the statements of financial position as at December 31, 2021 and 2022, are determined as follows: ( i December 31, 2021 December 31, 2022 Present value of defined benefit obligations ￦ 2,494,930 ￦ 2,218,655 Fair value of plan assets (2,314,632 ) (2,478,143 ) Liabilities ￦ 197,883 ￦ 51,654 Assets ￦ 17,585 ￦ 311,142
Summary of Changes in the Defined Benefit Obligations	Changes in the defined benefit obligations for the years ended December 31, 2021 and 2022, are as follows: ( i 2021 2022 Beginning ￦ 2,556,712 ￦ 2,494,930 Current service cost 249,125 238,068 Interest expense 44,905 59,041 Benefit paid (310,766 ) (316,047 ) Changes due to settlements of plan & Past Service Cost (681 ) (701 ) Remeasurements: Actuarial gains and losses arising from changes in demographic assumptions (8,375 ) (13,048 ) Actuarial gains and losses arising from changes in financial assumptions (61,002 ) (323,501 ) Actuarial gains and losses arising from experience adjustments (5,271 ) 80,845 Changes in scope of consolidation , etc. 30,283 (932 ) Ending ￦ 2,494,930 ￦ 2,218,655 Changes in the fair value of plan assets for the years ended December 31, 2021 and 2022, are as follows: ( i 2021 2022 Beginning ￦ 2,189,375 ￦ 2,314,632 Interest income 39,858 55,902 Remeasurements: Return on plan assets (excluding amounts included in interest income) (130 ) (8,542 ) Benefits paid (271,506 ) (287,419 ) Employer contributions 325,818 401,358 Changes in scope of consolidation , etc. 31,217 2,212 Ending ￦ 2,314,632 ￦ 2,478,143
Summary of Amounts Recognized in the Consolidated Statements of Operations	Amounts recognized in the consolidated statements of profit or loss for the years ended December 31, 2020, 2021 and 2022, are as follows: ( i 2020 2021 2022 Current service cost ￦ 248,047 ￦ 249,125 ￦ 238,068 Net Interest cost 6,494 5,047 3,139 Changes due to settlements of plan & Past Service Cost 1,075 (681 ) (701 ) Transfer out (16,514 ) (16,660 ) (15,102 ) Total expenses ￦ 239,102 ￦ 236,831 ￦ 225,404
Summary of Principal Actuarial Assumptions	Principal actuarial assumptions used are as follows: December 31, 2020 December 31, 2021 December 31, 2022 Discount rate 1.93% 2.55% 5.05% Salary growth rate 4.88% 5.10% 5.15%
Summary of Sensitivity of the Defined Benefit Obligations	The sensitivity of the defined benefit obligations as at December 31, 2022, 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 ￦ ￦ 117,362 Salary growth rate 0.5% point 113,037 (105,541 )
Summary of Expected Maturity Analysis of Undiscounted Pension Benefits	The expected maturity analysis of undiscounted pension benefits as at December 31, 2022, is as follows: ( i Less than 1 year Between 1-2 Between 2-5 Over 5 years Total Pension benefits ￦ 231,594 ￦ 336,926 ￦ 855,642 ￦ 1,922,089 ￦ 3,346,251

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2022
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Summary Of Major Commitments With Local Financial Institutions	As at December 31, 2022, major commitments with local financial institutions are as follows: (in millions of Korean won and Financial institution Limit Used amount Bank overdraft Kookmin Bank and others 372,000 — Inter-Korean Cooperation Fund Export-Import Bank of Korea 37,700 1,974 Economic Cooperation Business Insurance Export-Import Bank of Korea 3,240 1,732 Collateralized loan on electronic accounts receivable-trade Kookmin Bank and others 567,150 28,298 Plus electronic notes payable Industrial Bank of Korea 50,000 1,663 Working capital loan Korea Development Bank and others 1,415,600 165,100 Shinhan Bank USD 72,507 USD 72,507 Woori Bank EUR 7,700 EUR 7,700 Facility loans Shinhan Bank and others 824,000 309,680 Derivatives transaction limit Shinhan Bank 8,000 8,000 Korea Development Bank and others USD 2,510,510 USD 1,970,000 DBS Bank SGD 284,000 SGD 284,000 Citi Bank USD 400,000 JPY 400,000 USD 100,000 Total KRW 3,277,690 516,447 USD 2,983,017 2,142,507 EUR 7,700 7,700 SGD 284,000 284,000 JPY — 400,000
Summary of Guarantees Received from Financial Institutions	As at December 31, 2022, guarantees received from financial institutions are as follows: (in millions of Korean won and 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 273 Comprehensive credit line and others USD 10,300 Kookmin Bank Guarantee for payment in foreign currency USD 6,484 Shinhan Bank Guarantee for payment in Korean currency and others 36,298 Guarantee for payment in foreign currency and others USD 77,837 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 6,880 HSBC Guarantees for depositions USD 871 Seoul Guarantee Insurance Company Performance guarantee and others 783,247 Korea Software Financial Cooperative Performance guarantee and others 1,445,072 Korea Specialty Contractor Financial Cooperative Performance guarantee and others 531 Korea Housing Finance Corporation Performance guarantee and others 14,464 Information & Communication Financial Cooperative Performance guarantee and others 28,027 Total KRW 2,319,939 USD 109,645
Summary Of Guarantees Provided By The Group For Third Party	As at December 31, 2022, 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 Engineering Co., Ltd. 1 Gasan Solar Power Plant Inc. Shinhan Bank 4,700 672 Jan. 7, 2010 Jan. 8, 2025 KT Engineering Co., Ltd. 1 SPP Inc. Suhyup Bank 3,250 345 Feb. 17, 2014 Feb. 16, 2024 KT Engineering Co., Ltd. 1 Korea Cell Inc. Suhyup Bank 3,250 338 Feb. 17, 2014 Feb. 16, 2024 KT Engineering Co., Ltd. 1 San-Ya Agricultural Association Corporation Suhyup Bank 3,250 345 Feb. 17, 2014 Feb. 16, 2024 KT Alpha Co., Ltd. (KT Hitel Co., Ltd.) Cash payers T-commerce 860 — Apr. 14, 2022 Nasmedia Co., Ltd. Stockholders Association Members Korea Securities 5,654 986 — 1 According to the above payment guarantee, KT Engineering, a subsidiary of the Group, will have an obligation for repayment if the principal borrower does not repay the borrowing.
Summary of the issuance of real estate collateral trust and beneficiary certificates of the Group	As at December 31, 2022, the details of the issuance of real estate collateral trust and beneficiary certificates of the Group are as follows: (in millions of Korean won) Commitment Amount provided as Collateral assets Placing Trust collateral beneficiary Real Estate Collateral Trust 1 1st place NongHyup Bank ￦ 100,000 ￦ 120,000 Kyobo Life Insurance 180,000 216,000 Standard Chartered 120,000 144,000 Samsung Life Insurance 100,000 120,000 2nd place Industrial Bank of Korea 40,000 48,000 Korea Investment Capital 40,000 48,000 BNK Capital 30,000 36,000 Standard Chartered 20,000 24,000 NH Capital 20,000 24,000 3rd place 2 LOTTE Engineering & — 736,921 1 The Group provides a certificate of beneficiary rights for land classified as investment properties and inventory assets as collateral in connection with the above real estate collateral trust. 2 The Group provides LOTTE Engineering & Construction with a certificate of third-priority beneficiary rights as collateral in relation to the construction contract amount of ￦

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2022
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Summary of balance sheet information about leases for lessee	The consolidated statement of financial position shows the following amounts relating to leases: ( i December 31, December 31, Right-of-use assets Property and building ￦ 1,086,133 ￦ 1,081,067 Machinery and communication 64,443 50,794 Others 97,732 148,473 Total ￦ 1,248,308 ￦ 1,280,334 Investment property (buildings) 1 — ( i December 31, December 31, Lease liabilities 1 Current ￦ 332,702 ￦ 315,892 Non-Current 826,667 856,146 Total ￦ 1,159,369 ￦ 1,172,038 1 Included in the line items ‘Other current liabilities and other non-current liabilities’ in the consolidated statement s
Summary of statement of profit or loss information about leases for lessee	The consolidated statements of profit or loss show the following amounts relating to leases: ( i December 31, December 31, December 31, Depreciation of Right-of-use assets Property and building ￦ 290,168 ￦ 303,984 ￦ 305,120 Machinery and communication 58,419 41,794 31,140 Others 55,588 52,938 59,954 Total ￦ 404,175 ￦ 398,716 ￦ 396,214 Depreciation of Investment Properties ￦ 19,113 ￦ 1,794 ￦ 15 Interest expense relating to lease liabilities 44,091 36,651 41,469 Expense relating to short-term leases 10,998 7,984 12,876 Expense relating to leases of low-value assets that are not short-term leases 25,894 26,033 26,813 Expense relating to variable lease payments not included in lease liabilities 8,096 8,400 4,827

Share Capital (Tables)

Share Capital (Tables)	12 Months Ended
	Dec. 31, 2022
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Summary of Share Capital	As at December 31, 2021 and 2022, the Group’s number of authorized shares is one billion. December 31, 2021 December 31, 2022 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 ￦ ￦ 261,111,808 ￦ ￦ 1 The Group retired 51,787,959 treasury shares against retained earnings. Therefore, the ordinary shares amount differs from the amount resulting from multiplying the number of shares issued.

Retained Earnings (Tables)

Retained Earnings (Tables)	12 Months Ended
	Dec. 31, 2022
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Summary of Retained Earnings	Details of retained earnings as at December 31, 2021 and 2022, are as follows: ( i December 31, December 31, Legal reserve 1 ￦ 782,249 ￦ 782,249 Voluntary reserves 2 4,651,362 4,651,362 Unappropriated retained earnings 7,853,779 8,821,705 Total ￦ 13,287,390 ￦ 14,255,316 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 In accordance with the Restrictions on Special Taxation Act, R&D and HR related reserves under the voluntary reserves are separately accumulated when retained earnings from tax reserve funds are disposed, when income tax is recalculated from tax return adjustments. Reversal of these provisions can be paid out as dividends according to the related tax law.

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income and Other Components of Equity (Tables)	12 Months Ended
	Dec. 31, 2022
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Summary of Accumulated Other Comprehensive Income	As at December 31, 2021 and 2022, the details of the Controlling Company’s accumulated other comprehensive income are as follows: ( i December 31, December 31, Changes in investments in associates and joint ventures ￦ (3,461 ) ￦ (11,752 ) Gain ( ) 25,031 (7,109 ) Gain (loss) 108,685 (52,100 ) Exchange differences on translation for foreign operations (12,786 ) (6,815 ) Total ￦ 117,469 ￦ (77,776 )
Summary of Changes in Accumulated Other Comprehensive Income	Changes in accumulated other comprehensive income for the years ended December 31, 2021 and 2022, are as follows: 2021 ( i Beginning Increase/ decrease Reclassification to gain or loss Ending Changes in investments in associates and joint ventures ￦ 16,257 ￦ (19,718 ) ￦ — ￦ (3,461 ) Gain ( ) 19,809 141,805 (136,583 ) 25,031 Gain on valuation of financial assets at fair value through other comprehensive income 61,438 47,247 — 108,685 Exchange differences on translation for foreign operations (11,453 ) (1,333 ) — (12,786 ) Total ￦ 86,051 ￦ 168,001 ￦ (136,583 ) ￦ 117,469 2022 ( i Beginning Increase 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 (loss) 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 )
Summary of Other Components of Equity	The Group’s other components of equity as at December 31, 2021 and 2022, are as follows: ( i December 31, December 31, Treasury stock 1 ￦ (1,009,798 ) ￦ (202,295 ) Gain or loss on disposal of treasury stock 2 (8,658 ) (41,503 ) Share-based payments 4,068 6,222 Others 3 (418,692 ) (334,576 ) Total ￦ (1,433,080 ) ￦ (572,152 ) 1 During the year ended December 31, 2022, the Group granted as exchange of shares with HYUNDAI MOBIS and HYUNDAI MOTOR COMPANY (Notes 7 and 20). 2 The amount directly reflected in equity i ￦ million for the year ended December 31, 2022 (2021: ￦ 3 Profit or loss incurred from transactions with non-controlling interest and investment difference incurred from change in proportion of subsidiaries are included.
Summary of Treasury Stock	As at December 31, 2021 and 2022, the details of treasury stock are as follows: December 31, December 31, Number of shares (in shares) 25,303,662 5,069,130 Amounts (in millions of Korean won) ￦ 1,009,798 ￦ 202,295

Share-based Payments (Tables)

Share-based Payments (Tables)	12 Months Ended
	Dec. 31, 2022
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Summary of Details of Share-Based Payments	Details of share-based payments granted by the Controlling to executives and employees, including the CEO, by the resolution of the Board Directors 2021 ( i 15th grant Grant date June 17, 2021 Grantee CEO 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) May 11, 2022 Valuation method Fair value method ( i Employee wage negotiation Grant date September 6, 2021 Grantee All employees Vesting conditions Current employees as of September 6, 2021 Fair value per option (in Korean won) ￦ Total compensation costs (in Korean won) ￦ Estimated exercise date (exercise date) December 10, 2021 Valuation method Fair value method 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) ￦ Estimated exercise date (exercise date) During 2023 Valuation method Fair value method
Summary of Changes in the Number of Stock Options and the Weighted-Average Exercise Price	Changes in the number of stock options and the weighted-average exercise price as at December 31, 2021 and 2022, are as follows: (In share) 2021 Beginning Grant Expired Exercised 1 Ending Number of 14th grant 398,856 — (264,286 ) (134,570 ) — — 15th grant — 284,209 — — 284,209 — Employee wage negotiation — 1,432,332 — (1,432,332 ) — — Total 398,856 1,716,541 (264,286 ) (1,566,902 ) 284,209 — (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 — 1 The weighted average price of ordinary shares at the time of exercise , during the year ended December 31, is ￦ ￦

Revenue from Contracts with C_2

Revenue from Contracts with Customers and Relevant Contract Assets and Liabilities (Tables)	12 Months Ended
	Dec. 31, 2022
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Detail Explanation of Revenue in the consolidated Statement of operations	The Group has recognized the following amounts relating to revenue in the Consolidated Statements of Profit or Loss: ( i 2020 2021 2022 Revenue from contracts with customers ￦ 23,895,631 ￦ 24,712,128 ￦ 25,432,727 Revenue from other sources 203,763 185,877 206,128 Other income (Note 27) 341,253 307,654 595,351 Total revenue ￦ 24,440,647 ￦ 25,205,659 ￦ 26,234,206
Detail Explanation of Operating Revenue	Operating revenues for the years ended December 31, 2020, 2021 and 2022 are as follows: ( i 2020 2021 2022 Mobile services ￦ 6,805,218 ￦ 6,936,485 ￦ 7,013,889 Fixed-line services 4,827,015 4,960,338 5,056,513 Fixed-line and VoIP telephone services 1,463,553 1,465,059 1,378,265 Broadband Internet access services 2,256,188 2,343,591 2,504,833 Data communication services 1,107,274 1,151,689 1,173,415 Media and content 2,637,691 2,800,630 3,099,776 Financial services 3,493,920 3,661,896 3,836,589 Sale of goods 3,593,127 3,532,973 3,393,646 Others 3,083,676 3,313,337 3,833,793 Total ￦ 24,440,647 ￦ 25,205,659 ￦ 26,234,206
Detail Analysis of Contract with Customer Assets and Liabilities	The contract assets and liabilities recognized in relation to the revenues from contracts with customers are as follows: ( i December 31, December 31, Contract assets 1 ￦ 821,901 ￦ 963,133 Contract liabilities 1 360,098 344,869 Deferred revenue 2 ￦ 81,136 ￦ 81,653 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	The contract costs recognized as assets are as follows: ( i 2020 2021 2022 Incremental cost of contract establishment ￦ 1,726,191 ￦ 1,726,401 ￦ 1,744,096 Cost of Contract performance 78,757 74,843 73,582
Detail of Revenue Arising from Carried-Forward Contract Liabilities	The recognized revenue arising from carried-forward contract liabilities from prior year is as follows: ( i 2020 2021 2022 Allocation of the transaction price ￦ 251,975 ￦ 275,965 ￦ 246,843 Deferred revenue of joining/installment fee 42,685 42,100 44,204 Total ￦ 294,660 ￦ 318,065 ￦ 291,047

Other Income from Operating R_2

Other Income from Operating Revenue (Tables)	12 Months Ended
	Dec. 31, 2022
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Summary Of Other Income	Other income for the years ended December 31, 2020, 2021 and 2022, are as follows: ( i 2020 2021 2022 Gains on disposal of property and equipment and investment properties ￦ 20,289 ￦ 54,007 ￦ 52,603 Gains on disposal of intangible assets 2,961 1,726 622 Gain on disposal of right-of-use assets 5,797 3,138 3,326 Compensation on property and equipment 168,263 148,927 159,849 Gains on government subsidies 31,906 43,822 44,473 Gain on disposal of investments in subsidiaries — 244 216,591 Reversal of other allowance for bad debts 890 508 850 Others 111,147 55,282 117,037 Total ￦ 341,253 ￦ 307,654 ￦ 595,351

Operating Expenses (Tables)

Operating Expenses (Tables)	12 Months Ended
	Dec. 31, 2022
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Summary of Operating Expenses	Operating expenses for the years ended December 31, 2020, 2021 and 2022, are as follows: ( i 2020 2021 2022 Salaries and wages ￦ 4,123,680 ￦ 4,215,810 ￦ 4,495,885 Depreciation 2,605,128 2,605,594 2,637,463 Depreciation of right-of-use 404,175 398,716 396,214 Amortization of intangible assets 624,982 603,327 622,202 Commissions 965,461 1,125,944 1,295,434 Interconnection charges 500,081 507,567 479,500 International interconnection fee 172,529 192,008 186,253 Purchase of inventories 3,681,801 3,753,792 3,656,040 Changes of inventories 257,041 20,491 (195,046 ) Sales commission 2,337,127 2,343,375 2,353,909 Service cost 2,102,875 2,296,324 2,334,386 Utilities 360,797 364,373 368,348 Taxes and dues 283,197 268,651 276,962 Rent 136,355 123,246 160,848 Insurance premium 71,018 66,717 68,245 Installation fee 132,117 154,542 150,140 Advertising expenses 132,466 171,400 195,519 Research and development expenses 156,940 168,969 174,936 Card service cost 2,941,669 3,114,047 3,127,673 Loss on disposal of property and equipment 75,879 71,417 81,415 Loss on disposal of intangible assets 3,207 3,885 7,015 Loss on disposal of right-of-use 7,844 11,457 2,348 Direct cost of government subsidies 31,447 42,732 44,022 Loss on disposal of investments in subsidiaries — 13,727 — Impairment loss on property and equipment 79,775 2,115 16,094 Impairment loss on intangible assets 211,637 3,747 30,965 Donations 20,745 10,981 15,642 Other allowance for bad debts 51,333 28,066 17,551 Others 947,008 823,242 1,266,086 Total ￦ 23,418,314 ￦ 23,506,262 ￦ 24,266,049
Summary of Details of Salaries and Wages	Details of salaries and wages for the years ended December 31, 2020, 2021 and 2022, are as follows: ( i 2020 2021 2022 Short-term employee benefits ￦ 3,770,786 ￦ 3,837,359 ￦ 4,161,874 Post-employment benefits(Defined benefit plan) 239,102 236,831 225,404 Post-employment benefits(Defined contribution plan) 61,912 71,068 72,576 Share-based payment 28,604 47,415 16,799 Others 23,276 23,137 19,232 Total ￦ 4,123,680 ￦ 4,215,810 ￦ 4,495,885

Financial Income and Costs (Tab

Financial Income and Costs (Tables)	12 Months Ended
	Dec. 31, 2022
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Summary of Details of Financial Income	Details of financial income for the years ended December 31, 2020, 2021 and 2022, are as follows: ( i 2020 2021 2022 Interest income ￦ 270,571 ￦ 273,460 ￦ 271,925 Gain on foreign currency transactions 17,493 19,976 67,976 Gain on foreign currency translation 164,351 32,768 43,092 Gain on derivative transactions 9,397 2,215 50,668 Gain on valuation of derivatives 172 255,149 182,998 Gain on valuation of financial instruments 33,868 90,653 31,032 Others 2,762 52,062 42,737 Total ￦ 498,614 ￦ 726,283 ￦ 690,428
Summary of Details of Financial Costs	Details of financial costs for the years ended December 31, 2020, 2021 and 2022, are as follows: ( i 2020 2021 2022 Interest expenses ￦ 263,579 ￦ 263,389 ￦ 293,854 Loss on foreign currency transactions 27,805 13,105 81,171 Loss on foreign currency translation 26,340 213,689 200,109 Loss 1,406 6,287 24,331 Loss on valuation of derivatives 163,763 15,947 21,601 Loss on disposal of trade receivables 8,152 22,712 62,697 Loss on valuation of financial instruments 15,646 25,994 65,660 Others 692 2,207 485 Total ￦ 507,383 ￦ 563,330 ￦ 749,908

Deferred Income Tax and incom_2

Deferred Income Tax and income Tax Expense (Tables)	12 Months Ended
	Dec. 31, 2022
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Summary of Analysis of Deferred Tax Assets and Deferred Tax Liabilities	The analysis of deferred tax assets and deferred tax liabilities as at December 31, 2021 and 2022, is as follows: ( i December 31, December 31, Deferred tax assets Deferred tax assets to be recovered within 12 months ￦ 398,329 ￦ 398,710 Deferred tax assets to be recovered after more than 12 months 1,754,113 1,907,690 Deferred tax assets before offsetting 2,152,442 2,306,400 Deferred tax liabilities Deferred tax liabilities (642,954 ) (586,522 ) Deferred tax liabilities (1,729,718 ) (2,108,438 ) Deferred tax liabilities before offsetting (2,372,672 ) (2,694,960 ) Deferred tax assets after offsetting ￦ 423,728 ￦ 579,090 Deferred tax liabilities after offsetting ￦ 643,958 ￦ 967,650
Summary of Movement in Deferred Income Tax Assets and Liabilities	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) 2021 Beginning Statement of Other Ending Deferred tax liabilities Investments in associates and joint ventures (181,564 ) (68,166 ) 9,097 (240,633 ) Depreciation and impairment loss (4,175 ) (84,413 ) — (88,588 ) Plan assets (521,257 ) (17,340 ) (331 ) (538,928 ) Advanced depreciation provision (311,918 ) (27,087 ) — (339,005 ) Contract assets (509,509 ) 15,592 — (493,917 ) Financial assets at fair value through profit or loss (627 ) 291 — (336 ) Financial assets at fair value through other comprehensive income (30,623 ) (33,267 ) 16,369 (47,521 ) Others (472,153 ) (150,013 ) (1,578 ) (623,744 ) Total ￦ (2,031,826 ) ￦ (364,403 ) ￦ 23,557 ￦ (2,372,672 ) Deferred tax assets Depreciation and impairment loss 226,960 (1,139 ) — 225,821 Contract liabilities 140,494 7,960 — 148,454 Defined benefit liabilities 598,364 (8,663 ) (18,365 ) 571,336 Provisions 167,384 5,487 — 172,871 Others 758,060 141,727 (244 ) 899,543 Total ￦ 1,891,262 ￦ 145,372 ￦ (18,609 ) ￦ 2,018,025 Temporary difference, net (140,564 ) (219,031 ) 4,948 (354,647 ) Tax credit carryforwards 144,931 (10,514 ) — 134,417 Total net balance ￦ 4,367 ￦ (229,545 ) ￦ 4,948 ￦ (220,230 ) (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 )
Summary of Tax Impacts Recognized Directly To Equity	The tax impacts recognized directly to equity as at December 31, 2020, 2021, and 2022, are as follows: December 31, 2020 December 31, 2021 December 31, 2022 ( i Before recognition Tax effect After Before recognition Tax effect After Before recognition Tax effect After Gain (loss) ￦ 54,969 ￦ (12,972 ) ￦ 41,997 ￦ 163,892 ￦ (34,112 ) ￦ 129,780 ￦ (216,862 ) ￦ 58,288 ￦ (158,574 ) Gain (loss) on valuation of hedge instruments 37,247 (9,860 ) 27,387 6,916 (1,644 ) 5,272 (42,510 ) 11,180 (31,330 ) Remeasurements of net defined benefit liabilities (77,382 ) 17,201 (60,181 ) 74,518 (18,696 ) 55,822 247,162 (65,733 ) 181,429 Share of gain 25,538 (8,820 ) 16,718 (34,909 ) 9,097 (25,812 ) (14,931 ) 3,748 (11,183 ) Exchange differences on translation for foreign operations (3,614 ) 948 (2,666 ) 683 (178 ) 505 23,316 (5,852 ) 17,464 Gain or loss on disposal of treasury stock (27,786 ) 7,288 (20,498 ) (15,657 ) 4,080 (11,577 ) (59,308 ) 14,886 (44,422 ) Total ￦ 8,972 ￦ (6,215 ) ￦ 2,757 ￦ 195,443 ￦ (41,453 ) ￦ 153,990 ￦ (63,133 ) ￦ 16,517 ￦ (46,616 )
Summary of Details of Income Tax Expense	Details of income tax expense for the years ended December 31, 2020, 2021 and 2022, are calculated as follows: ( i 2020 2021 2022 Current income tax expense ￦ 213,225 ￦ 289,471 ￦ 335,796 Impact of change in deferred taxes 72,124 229,545 169,961 Income tax expense ￦ 285,349 ￦ 519,016 ￦ 505,757
Summary of Tax on the Group's Profit Before Tax	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: ( i 2020 2021 2022 Profit before income tax expense ￦ 1,031,605 ￦ 1,978,411 ￦ 1,891,392 Statutory income tax expense ￦ 273,329 ￦ 533,701 ￦ 509,771 Tax effect Income not taxable for taxation purposes (24,657 ) (4,307 ) (47,550 ) Non-deductible expenses 31,741 20,570 53,398 Tax credit (47,056 ) (31,517 ) (54,895 ) Additional payment of income taxes 429 (221 ) 11,744 Adjustments in deferred tax from changes in tax rate — — (41,545 ) Tax effect and adjustment on consolidation Goodwill impairment — — 5,809 Eliminated dividend income form subsidiaries 20,682 7,264 — Changes of out-side tax effect 38,552 4,738 29,922 Intangible Asset impairment and amortization 3,790 796 5,276 Reversal expenses of contract cost assets (6,643 ) (2,932 ) (4,800 ) Change in scope of consolidation — (5,128 ) — Others (4,818 ) (3,948 ) 38,627 Income tax expense ￦ 285,349 ￦ 519,016 ￦ 505,757
Summary of deferred tax assets and liabilities that are not recognized	Details of deferred tax assets and liabilities that are not recognized as at December 31, 2021 and 2022, are as follows: ( i 2021 2022 Deductible temporary differences Investment in subsidiaries, associates, and joint ventures ￦ 2,355,539 ￦ 3,384,295 Unused tax loss 106,853 103,326 Unused Tax credit 1,376 1,988 Others 119,265 387,084 Total ￦ 2,583,033 ￦ 3,876,693 Taxable temporary differences Investment in subsidiaries, associates, and joint ventures ￦ 568,540 ￦ 857,076 Others — 216,660 Total ￦ 568,540 ￦ 1,073,736
Summary of expected period of expiry for unused tax losses not recognized in deferred tax assets	The expected period of expiry for unused tax losses not recognized in deferred tax assets as at December 31, 2021 and 2022, is as follows: ( i 2021 2022 2022 ￦ 4,249 ￦ — 2023 76,133 72,512 2024 4,484 5,011 2025 2,836 3,701 2026 2,390 2,112 2027 3,419 2,534 2028 2,091 396 2029 2,579 617 2030 3,111 2,198 2031 1,841 1,360 Atter 2032 3,720 12,885 Total ￦ 106,853 ￦ 103,326

Earnings per Share (Tables)

Earnings per Share (Tables)	12 Months Ended
	Dec. 31, 2022
Text block [abstract]
Summary of Basic and Diluted Earnings per Share From Operations	Basic earnings per share from operations for the years ended December 31, 2020, 2021 and 2022, is calculated as follows: 2020 2021 2022 Profit attributable to ordinary shares ￦ 700,889 ￦ 1,354,537 ￦ 1,259,686 Weighted average number of ordinary shares outstanding (in number of shares) 245,207,307 235,201,782 242,235,332 Basic earnings per share (in Korean won) ￦ 2,858 ￦ 5,759 ￦ 5,200 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 Controlling Company has dilutive potential ordinary shares from convertible bond and Diluted earnings per share from operations for the years ended December 31, 2020, 2021 and 2022 is calculated as follows: 2020 2021 2022 Profit attributable to ordinary shares (in millions of Korean won) ￦ 700,889 ￦ 1,354,537 ￦ 1,259,686 Adjustment to net income attributable to ordinary shares ( i — — (496 ) Diluted profit attributable to ordinary shares (in millions of Korean won) 700,889 1,354,537 1,259,190 Number of dilutive potential ordinary shares outstanding (in number of shares) 69,598 483,760 91,931 Weighted average number of ordinary shares outstanding (in number of shares) 245,276,905 235,685,542 242,327,263 Diluted earnings per share (in Korean won) ￦ 2,858 ￦ 5,747 ￦ 5,196 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.

Cash Generated from Operations

Cash Generated from Operations (Tables)	12 Months Ended
	Dec. 31, 2022
Text block [abstract]
Summary of Cash Flows from Operating Activities	Cash flows from operating activities for the years ended December 31, 2020, 2021 and 2022, are as follows: (in millions of Korean won) 2020 2021 2022 1. Profit for the year ￦ 746,256 ￦ 1,459,395 1,385,635 2. Adjustments to reconcile net income Income tax expense 285,349 519,016 505,757 Interest income 1 (291,425 ) (300,900 ) (340,794 ) Interest expense 1 265,035 268,847 320,914 Dividends income 2 (4,442 ) (21,525 ) (14,121 ) Depreciation 2,635,307 2,643,894 2,687,191 Amortization of intangible assets 628,154 604,744 627,261 Depreciation of right-of-use assets 404,174 398,716 396,214 Provision for severance benefits 255,615 253,491 240,506 Impairment losses on trade receivables 139,957 105,344 132,102 Share of net profit or loss of associates and joint ventures (18,041 ) (116,061 ) 16,821 Loss(gain) on disposal of associates and joint ventures 111 1 (38,024 ) Loss(gain) on the disposal of subsidiaries — 13,483 (216,591 ) Loss(gain) on disposal of right-of-use assets 2,047 8,319 (978 ) Impairment losses on assets held for sale — 11 — Impairment loss on property and equipment and investment in properties — 2,115 16,094 Loss on disposal of property and equipment and investment in properties 3 55,590 17,410 (66,317 ) Loss on disposal of intangible assets 246 2,159 6,393 Loss on impairment of intangible assets 211,637 3,747 30,674 Loss(gain) on foreign currency translation (138,011 ) 180,921 157,017 Loss(gain) on valuation and settlement of derivatives, net 155,600 (235,130 ) (205,381 ) Loss on disposal of financial assets at fair value through profit or loss (29,974 ) (29,974 ) (2,347 ) Loss(Gain) on valuation of financial assets at fair value through profit or loss (64,660 ) (64,660 ) 44,833 Loss(gain) on disposal of financial assets at amortized cost 4 (138 ) (35 ) 3 Others 127,949 84,625 (49,891 ) 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 66,462 327,031 (43,787 ) Decrease( i 685,209 (328,610 ) (1,598,216 ) Decrease(increase) in other current assets 9,089 (89,230 ) (101,947 ) Decrease(increase) in other non-current assets (86,039 ) (143,087 ) (120,054 ) Decrease(increase) in inventories 288,507 32,798 (179,255 ) Increase(decrease) in trade payables (135,760 ) 289,044 (368,355 ) Increase(decrease) in other payables (1,232,646 ) 207,583 1,103,113 Increase(decrease) in other current liabilities 127,076 107,993 (30,375 ) Decrease (56,319 ) (14,915 ) (1,015 ) Increase(decrease) in provisions 2,264 (4,668 ) (22,115 ) Increase (decrease (1,948 ) 3,696 (384 ) Increase in plan assets (136,336 ) (114,631 ) (90,771 ) Payment of post-employment (186,520 ) (241,350 ) (343,931 ) 4. Cash generated from operations (1+2+3) ￦ 4,745,293 ￦ 5,829,607 ￦ 3,835,879 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	Significant transactions not affecting cash flows for the years ended December 31, 2020, 2021 and 2022, are as follows: ( i 2020 2021 2022 Reclassification of the current portion of borrowings ￦ 1,229,359 ￦ 1,303,543 ￦ 1,004,818 Reclassification of construction-in-progress to property and equipment 3,011,519 2,916,888 3,167,965 Reclassification of accounts payable from property and equipment 22,052 (149,512 ) (7,055 ) Reclassification of accounts payable from intangible assets (345,675 ) 524,040 (197,389 ) Reclassification of payable from defined benefit liabilities 72,346 69,415 (32,417 ) Reclassification of payable from plan assets 66,046 (60,320 ) 28,532 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, 2022
Text block [abstract]
Summary of Changes in Liabilities Arising from Financial Activities	Changes in liabilities arising from financing activities, liabilities related to cashflow to be classified as future financing activities, for the years ended December 31, 2020, 2021 and 2022, are as follows: ( i 2020 Non-cash Beginning Cash Newly Exchange Fair Value Changes consolidati scope Others Ending Borrowing ￦ 7,298,867 ￦ 167,867 ￦ 17,523 ￦ (157,985 ) ￦ — ￦ — ￦ (9,974 ) ￦ 7,316,298 Lease liabilities 1,211,351 (447,784 ) 473,477 (3 ) 40 3,564 (97,005 ) 1,143,640 Other financial liabilities — (13,674 ) 13,674 — — — — — Derivative liabilities 20,096 (943 ) 2,798 142,511 (23,669 ) — (10,220 ) 130,573 Derivative assets (58,576 ) 34,933 — 2,870 (3,456 ) — 16,623 (7,606 ) Total ￦ 8,471,738 ￦ (259,601 ) ￦ 507,472 ￦ (12,607 ) ￦ (27,085 ) ￦ 3,564 ￦ (100,576 ) ￦ 8,582,905 ( i 2021 Beginning Cash Non-cash Ending Newly Exchange Fair Value Changes consolidati scope 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 2022 Beginning Cash Non-cash Ending Newly Exchange Fair value Changes in on scope Others Borrowing ￦ 8,437,703 ￦ 1,391,32 ￦ — ￦ 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 ￦ 1,047,72 ￦ 426,644 ￦ 18,805 ￦ 44,221 ￦ — ￦ (88,737 ) ￦ 11,021,448

Segment Information (Tables)

Segment Information (Tables)	12 Months Ended
	Dec. 31, 2022
Text block [abstract]
Summary of Segment Information	Details of each segment for the years ended December 31, 2020, 2021 and 2022, are as follows: 2020 ( i Operating revenues Operating Income Depreciation and Amortization 1 ICT ￦ 18,275,765 ￦ 809,741 ￦ 3,233,878 Finance 3,344,286 101,825 41,693 Satellite TV 668,320 64,627 58,181 Real estate 543,587 76,431 56,205 Others 5,780,960 122,546 328,165 28,612,918 1,175,170 3,718,122 Elimination (4,172,271 ) (152,837 ) (83,838 ) Consolidated amount ￦ 24,440,647 ￦ 1,022,333 ￦ 3,634,284 2021 ( i Operating revenues Operating Income Depreciation and Amortization 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 29,737,242 1,755,230 3,712,507 Elimination (4,531,583 ) (55,833 ) (104,869 ) Consolidated amount ￦ 25,205,659 ￦ 1,699,397 ￦ 3,607,638 2022 ( i 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 31,456,833 2,073,417 3,852,350 Elimination (5,222,627 ) (105,260 ) (196,471 ) Consolidated amount ￦ 26,234,206 ￦ 1,968,157 ￦ 3,655,879 1 Sum of the amortization of tangible assets, intangible assets, investment properties, and right-of-use assets.
Summary of Operating Revenues and Non Current Assets by Geographical Regions	Operating revenues for the years ended December 31, 2020, 2021 and 2022 and non-current assets as at December 31, 2021 and 2022 by geographical regions, are as follows: (In millions of Korean won) Operating revenues Non-current assets 1 Location 2020 2021 2022 2021.12.31 2022.12.31 Domestic ￦ 24,368,729 ￦ 25,114,719 ￦ 26,074,349 ￦ 20,627,543 ￦ 20,845,214 Overseas 71,918 90,940 159,857 253,638 270,490 Total ￦ 24,440,647 ￦ 25,205,659 ￦ 26,234,206 ￦ 20,881,181 ￦ 21,115,704 1 Non-current assets include 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, 2022
Text block [abstract]
Summary of Related Parties Outstanding Balances of Receivables and Payables	Outstanding balances of receivables and payables in relations to transactions with related parties as at December 31, 2021 and 2022, are as follows: December 31, 2021 Receivables Payables (in millions of Korean won) Trade Other Trade Other Lease liabilities Associates and joint ventures K Bank, Inc. ￦ 821 ￦ 51,422 ￦ — ￦ 513 ￦ — IGIS Professional Investors Private Investment Real Estate Investment LLC No.395 4,614 — — — — Others 565 1,853 343 4,829 — Total ￦ 6,000 ￦ 53,275 ￦ 343 ￦ 5,342 ￦ — December 31, 2022 Receivables Payables (in millions of Korean won) Trade Other Trade Other Lease liabilities 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
Summary of Significant Transactions With Related Parties	2020 ( i Sales Purchases 1 Associates and joint ventures K- Realty CR-REITs No.1 ￦ 2,298 ￦ — Korea Information & Technology Investment Fund (KIF Investment Fund) — — K Bank, Inc. 15,658 8,227 Others 809 10,272 Total ￦ 18,765 ￦ 18,499 2020 (in millions of Korean won ) Interest Interest Dividend Associates and joint ventures K- Realty CR-REITs No.1 ￦ — ￦ 917 ￦ 8,061 Korea Information & Technology Investment Fund (KIF Investment Fund) — — 9,241 K Bank, Inc. 14 — — Others — — 43 Total ￦ 14 ￦ 917 ￦ 17,345 1 A , and other s. 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 ￦ — ￦ 205 ￦ 40,142 Korea Information & Technology Investment Fund (KIF Investment Fund) 223 — — K Bank, Inc. — — — Others 2 ,3 — — 8,637 Total ￦ 223 ￦ 205 ￦ 48,779 1 A , 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 ( i 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 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.
Summary of Key Management Compensation	Key management compensation for the years ended December 31, 2020, 2021 and 2022, consists of: (in millions of Korean won) 2020 2021 2022 Salaries and other short-term benefits ￦ 2,086 ￦ 2,189 ￦ 1,855 Post-employment benefits 390 412 294 Share-based compensation 625 669 976 Total ￦ 3,101 ￦ 3,270 ￦ 3,125
Summary of Fund Transactions With Related Parties	Fund transactions with related parties for the years ended December 31, 2020, 2021 and 2022, are as follows: 2020 Borrowing transactions 1 Equity contributions (in millions of Korean won) Borrowings Repayments Associates and joint ventures K- Realty CR-REITs No.1 ￦ — ￦ 20,304 ￦ — Studio Discovery Co. Ltd. — — 3,000 KT Young Entrepreneurs DNA Investment Fund — — 3,600 KT-Smart Factory Investment Fund — — 2,800 KT-CKP New Media Investment Fund — — (109 ) K Bank, Inc. — — 195,011 Gyeonggi-KT Yoojin Superman Fund — — 1,000 Hyundai Robotics Co. Ltd. — — 50,000 Total ￦ — ￦ 20,304 ￦ 255,302 1 Borrowing transactions include lease transactions. 202 1 Borrowing transactions 1 Equity contributions (in millions of Korean won ) Borrowings Repayments Associates and joint ventures 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 transaction s 2 Others include transactions before exclusion as associates and joint ventures of the Group. 2022 Borrowing transactions 1 Equity (in millions of Korean won) Borrowings Repayments Associates and joint ventures 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 I — — 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 Borrowing transactions include lease transactions.

Financial Risk Management (Tabl

Financial Risk Management (Tables)	12 Months Ended
	Dec. 31, 2022
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 at December 31, 2021 and 2022, are as follows: (in millions of Korean won) December 31, 2021 December 31, 2022 Cash and cash equivalents (except for cash on hand) ￦ 2,989,713 ￦ 2,437,629 Trade and other receivables Financial assets at amortized costs 5,687,103 7,459,994 Financial assets at fair value through other comprehensive income 491,713 129,124 Contract assets 745,085 802,253 Other financial assets Derivatives financial assets for hedging 99,453 190,830 Financial assets at fair value through profit or loss 862,481 942,274 Financial assets at fair value through other comprehensive income 94,750 5,432 Financial assets at amortized costs 608,389 1,060,058 Total ￦ 11,578,687 ￦ 13,027,594
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, 2021 (in millions of Korean won) Less than 1 year 1-5 years More than Total Trade and other payables ￦ 6,698,783 ￦ 1,232,468 ￦ 159,647 ￦ 8,090,898 Borrowings(including debentures) 1,927,456 5,635,558 2,275,557 9,838,571 Lease liabilities 388,226 484,476 427,860 1,300,562 Other non-derivative financial liabilities 1,473 206,749 100,900 309,122 Financial guarantee contracts 1 71,697 — — 71,697 Total ￦ 9,087,635 ￦ 7,559,251 ￦ 2,963,964 ￦ 19,610,850 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, 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.
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, 2020 ( i Less than 1 year 1-5 years More than Total Derivatives settled gross 2 Outflow ￦ 248,300 ￦ 2,179,046 ￦ 498,619 ￦ 2,925,965 Inflow 249,301 2,074,747 480,570 2,804,618 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 1-5 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 1 During the year ended December 31, 2022, 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 20). 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 at December 31, 2021 and 2022, are as follows: (in millions of Korean won) December 31, 2021 December 31, 2022 Total liabilities ￦ 20,592,180 ￦ 22,577,114 Total equity 16,567,161 18,412,696 Debt-to-equity ratio 124 % 123 % 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 at December 31, 2021 and 2022, are as follows: (in millions of Korean won, %) December 31, 2021 December 31, 2022 Total borrowings ￦ 8,437,703 ￦ 10,006,685 Less: cash and cash equivalents (3,019,592 ) (2,449,062 ) Net debt 5,418,111 7,557,623 Total equity 16,567,161 18,412,696 Total capital 21,985,272 25,970,319 Gearing ratio 25 % 29 %
Summary of Group's Recognized Financial Assets Subject to Enforceable Master Netting Arrangements or Similar Agreements	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, 2021 Gross Gross Net amounts position Amounts not offset Net Financial Cash Trade receivables ￦ 79,102 ￦ — ￦ 79,102 ￦ (65,592 ) ￦ — ￦ 13,510 (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
Summary of Group's Recognized Financial Liabilities Subject to Enforceable Master Netting Arrangements or Similar Agreements	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, 2021 Gross Gross offset Net amounts position Amounts not offset Net Financial Cash Trade payables ￦ 69,944 ￦ — ￦ 69,944 ￦ (65,592 ) ￦ — ￦ 4,352 Total ￦ 69,944 ￦ — ￦ 69,955 ￦ (65,592 ) ￦ — ￦ 4,352 (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 Total ￦ 47,271 ￦ (764 ) ￦ 46,507 ￦ (44,518 ) ￦ — ￦ 1,989
Currency risk [Member]
Statement [LineItems]
Summary of Exposures to Risks, Effects on Profit before Income Tax and Shareholders' Equity	As at December 31, 2020, 2021 and 2022, if the foreign exchange rate had strengthened/weakened by 10% with all other variables held constant, the effects on profit before income tax and shareholders’ equity would have been as follows: (in millions of Korean won) Fluctuation of Impact on profit 1 Impact on 2020.12.31 10% ￦ 25,220 ￦ 36,961 -10% (25,220 ) (36,961 ) 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
Summary of Details of Financial Assets and Liabilities in Foreign Currencies	Details of financial assets and liabilities in foreign currencies as at December 31, 2020, 2021 and 2022, are as follows: (In thousands of foreign currencies) 2020 2021 2022 Financial Financial Financial Financial Financial Financial USD 400,046 1,937,935 245,759 2,302,642 106,426 2,336,607 SDR 1 255 728 255 722 255 722 JPY 209,376 46,000,009 29,227 30,000,763 32,801 400,002 GBP — — — 1,005 30 83 EUR 316 162 3,943 10,801 185 7,832 CNY 458 491 — — — — RWF 2 646 — 586 — 15,521 13,025 THB 3 535 — 2,160 — 265 — MMK 4 — — — — — — TZS 5 1,019 — 1,644 — 1,464 — BWP 6 212 — 93 — 183 — HKD 7 — 198 — 105 37 — BDT 8 — — — — — — PLN 9 26 — — — — — VND 10 242,370 — 257,895 — 280,226 — XAF 11 16,229 — — — — — SGD 12 6 284,000 13 284,000 448 284,000 TWD 13 — — — 226 — — CHF 14 — — — 161 — — MYR 15 — — — — 1 — BGN 16 — — — — 62 — 1 Special Drawing Rights. 2 Rwanda Franc. 3 Thailand Bhat. 4 Myanmar Kyat. 5 Tanzanian Shilling. 6 Botswana Pula. 7 Hong Kong Dollar. 8 Bangladesh Taka. 9 Polish Zloty. 10 Vietnam Dong. 11 Central African Franc. 12 Singapore Dollar. 13 Taiwan Dollar. 14 Swiss Franc. 15 Ringgit Malaysia. 16 Bulgarian Lev.
Equity price risk [Member]
Statement [LineItems]
Summary of Exposures to Risks, Effects on Profit before Income Tax and Shareholders' Equity	As at December 31, 2020, 2021 and 2022, 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 2020.12.31 10% ￦ 2,811 ￦ 3,472 -10% (2,811 ) (3,472 ) 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 )
Interest rate risk [Member]
Statement [LineItems]
Summary of Exposures to Risks, Effects on Profit before Income Tax and Shareholders' Equity	As at December 31, 2020, 2021 and 2022, if the market interest rate had increased/decreased by 100 bp with other variables held constant, the effects on profit before income tax and shareholders’ equity would be as follows: (in millions of Korean won) Fluctuation of interest rate Impact on profit Impact on 2020.12.31 + 100 bp ￦ 973 ￦ 18,584 - 100 bp (973 ) (19,377 ) 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

Fair Value (Tables)

Fair Value (Tables)	12 Months Ended
	Dec. 31, 2022
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 at December 31, 2021 and 2022, are as follows: December 31, 2021 December 31, 2022 (in millions of Korean won) Carrying Fair value Carrying Fair value Financial assets Cash and cash equivalents ￦ 3,019,592 1 ￦ 2,449,062 1 Trade and other receivables Financial assets measured at amortized cost 2 5,610,377 1 7,364,516 1 Financial assets at fair value through other comprehensive income 491,713 491,713 129,124 129,124 Other financial assets Financial assets measured at amortized cost 608,389 1 1,060,058 1 Financial assets at fair value through profit or loss 952,319 952,319 1,064,856 1,064,856 Financial assets at fair value through other comprehensive income 347,877 347,877 1,508,192 1,508,192 Derivative financial assets for hedging purpose 99,453 99,453 190,830 190,830 Total ￦ 11,129,720 ￦ 13,766,638 Financial liabilities Trade and other payables ￦ 7,980,203 1 ￦ 8,397,264 1 Borrowings 8,437,703 8,578,827 10,006,685 9,405,992 Other financial liabilities Financial liabilities at amortized cost 263,500 1 246,606 1 Financial liabilities at fair value through profit or loss 216,040 216,040 141,280 141,280 Derivative financial liabilities for hedging purpose 18,126 18,126 33,555 33,555 Total ￦ 16,915,572 ￦ 18,825,390 1 The Group did not conduct fair value estimation since the book amount is a reasonable approximation of the fair value . 2 With the application of IFRS 7, lease receivables are excluded from th e
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 or its fair value is disclosed as at December 31, 2021 and 2022, are as follows: December 31, 2021 (in millions of Korean won) Level 1 Level 2 Level 3 Total Assets Trade and other receivables Financial assets at fair value through other comprehensive income ￦ — ￦ 491,713 ￦ — ￦ 491,713 Other financial assets Financial assets at fair value through profit or loss 24,285 350,949 577,085 952,319 Financial assets at fair value through other comprehensive income 17,328 7,176 323,373 347,877 Derivative financial assets for hedging purpose — 67,888 31,565 99,453 Investment properties — — 4,263,381 4,263,381 Total ￦ 41,613 ￦ 917,726 ￦ 5,195,404 ￦ 6,154,743 Liabilities Borrowings ￦ — ￦ 8,578,827 ￦ — ￦ 8,578,827 Other financial liabilities Financial liabilities at fair value through profit or loss — 708 215,332 216,040 Derivative financial liabilities for hedging purpose — 18,126 — 18,126 Total ￦ — ￦ 8,597,661 ￦ 215,332 ￦ 8,812,993 (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 comprehensive income 1,005,900 5,163 497,129 1,508,192 Derivative financial assets for hedging purpose — 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
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 at December 31, 2021 and 2022, are as follows: 2021 Financial assets Financial liabilities (in millions of Korean won) Financial assets Financial assets Derivative Financial Beginning balance ￦ 432,509 ￦ 50,789 ￦ (4,194 ) ￦ 2,637 Acquisition 492,842 118,648 — 205,323 Reclassification (25,757 ) 14,633 — — Changes in c s 353 (3,051 ) — 46,208 Disposal (418,029 ) (5,325 ) — — Amount recognized in profit or loss 2 95,167 71 43,150 (38,836 ) Amount recognized in other 2 — 147,608 (7,391 ) — Ending balance ￦ 577,085 ￦ 323,373 ￦ 31,565 ￦ 215,332 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. 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 ) Changes in consolidation scope — (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 financial liabilities measured at fair value through profit or loss consists of derivative valuation gains and losses. 2 The recognition of gains and losses on derivatives financial liabilities for hedging purposes consists entirely of derivatives valuation gains.
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 at December 31, 2021 and 2022, are as follows: December 31, 2021 (in millions of Korean won) Fair value Level Valuation techniques Inputs Assets Trade and other receivables Financial assets at fair value ￦ 491,713 2 DCF Model Guaranteed bond interest Other financial assets Financial assets at fair value 928,034 2,3 DCF Model, Bond interest rate, Underlying asset price Financial assets at fair value 330,549 2,3 DCF Model, Discount rate Derivative financial assets for 99,453 2,3 Hull-White Model, Market observation discount rate Investment properties 4,263,381 3 DCF Model Liabilities Borrowings ￦ 8,578,827 2 DCF Model Bond interest rate Other financial liabilities Financial liabilities at fair value 216,040 2,3 DCF Model, Forward rate, Market interest rate Derivative financial liabilities for 18,126 2 DCF Model Market observation December 31, 2022 (in millions of Korean won) Fair value Level Valuation techniques Inputs Assets Trade and other receivables Financial assets at fair value ￦ 129,124 2 DCF Model Guaranteed bond interest Other financial assets Financial assets at fair value 1,038,209 2,3 DCF Model, Model, Market Interest rate, Underlying asset price Financial assets at fair value through 502,292 2,3 DCF Model, Discount rate Derivative financial assets for hedging 190,830 2,3 Hull-White Model, Market observation discount rate, 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 2,3 DCF Model Binomial Option Pricing Model, Monte-Carlo Simulation Derivative financial liabilities for hedging 33,555 2 DCF Model Market observation
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, 2021 and 2022, are as follows: (in millions of Korean won) 2021 2022 Derivatives used Derivative held Derivatives used Derivative held I. Beginning balance ￦ 2,257 ￦ — ￦ 832 ￦ — II. New transactions — — — — III. Recognized at fair value through profit or loss (1,425 ) — (832 ) — IV. Ending balance (I+II+III) ￦ 832 ￦ — ￦ — ￦ —

Interests in Unconsolidated S_2

Interests in Unconsolidated Structured Entities (Tables)	12 Months Ended
	Dec. 31, 2022
Investments accounted for using equity method [abstract]
Summary of Unconsolidated Structured Entities and Nature of Risks	Details of scale of unconsolidated structured entities and nature of the risks associated with an entity’s interests in unconsolidated structured entities as at December 31, 2021 and 2022, are as follows: (in millions of Korean won) December 31, 2021 Real Estate PEF and Asset Total Total assets of unconsolidated structured entities ￦ 2,343,487 ￦ 5,202,439 ￦ 2,256,256 ￦ 9,802,182 Assets recognized in statement of financial position Other financial assets ￦ 40,587 ￦ 237,841 ￦ — ￦ 278,428 Joint ventures and associates 125,009 246,440 — 371,449 Total ￦ 165,596 ￦ 484,281 ￦ — ￦ 649,877 Maximum loss exposure 1 Investment assets ￦ 165,596 ￦ 484,281 ￦ — ￦ 649,877 Investment agreement, etc — 63,489 — 63,489 Total ￦ 165,596 ￦ 547,770 ￦ — ￦ 713,366 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 by agreements including purchase agreements, credit granting and others. (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, etc 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 by agreements including purchase agreements, credit granting and others.

Information About Non-control_2

Information About Non-controlling Interests (Tables)	12 Months Ended
	Dec. 31, 2022
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, 2020, 2021 and 2022 are as follows: (In millions of Korean won) December 31, 2020 Non- Accumulated non-controlling Profit or loss non-controlling Dividend s Others Accumulated non-controlling KT Skylife Co., Ltd. 49.7 % ￦ 375,906 ￦ 22,171 ￦ (8,279 ) ￦ (898 ) ￦ 388,900 BC Card Co., Ltd. 30.5 % 417,475 9,899 (22,787 ) 7,239 411,826 KT Powertel Co., Ltd. 55.2 % 54,276 2,151 (478 ) (202 ) 55,747 KT Alpha Co., Ltd. (KT Hitel Co.,Ltd.) 32.9 % 54,709 (1,840 ) — (2,563 ) 50,306 KT Telecop Co., Ltd. 13.2 % 3,650 152 — (208 ) 3,594 (In millions of Korean won) December 31, 2021 Non- Accumulated non-controlling Profit or loss non-controlling Dividend s 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- Accumulated non-controlling Profit or loss non-controlling Dividend s Others Accumulated non-controlling KT Skylife C o., 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
Summary of Financial Information on Subsidiaries	Summarized consolidated statements of financial position as at December 31, 2020, 2021 and 2022, are as follows: December 31, 2020 (in millions of Korean won) KT Skylife BC Card Co., KT Powertel KT Alpha Co., Non-controlling Interests rate (%) 49.7 % 30.5 % 55.2 % 32.9 % Current assets ￦ 480,450 ￦ 1,785,914 ￦ 90,056 ￦ 140,948 Non-current assets 439,026 1,298,484 29,638 148,001 Current liabilities 153,236 1,602,667 17,045 74,045 Non-current liabilities 21,803 176,083 1,788 18,554 Equity 744,437 1,305,648 100,861 196,350 Operating revenue 706,631 3,387,640 65,897 350,231 Profit for the year 58,190 39,455 3,809 2,080 Total comprehensive income (loss) 55,647 61,796 3,442 (8,700 ) Cash flows from operating activities 160,934 (119,163 ) 6,011 62,521 Cash flows from investing activities (105,293 ) 58,042 (3,353 ) (58,186 ) Cash flows from financing activities (19,650 ) 22,790 (1,515 ) (1,856 ) Net increase (decrease) in cash and cash equivalents 35,991 (38,331 ) 1,143 2,479 Cash and cash equivalents at beginning of year 63,850 279,162 6,217 37,043 Exchange differences (7 ) (247 ) — (83 ) Cash and cash equivalents at end of year 99,834 240,584 7,360 39,439 December 31, 2021 (in millions of Korean won) KT Skylife Co., Ltd. BC Card Co., KTIS KTCS Nasmedia, Non-controlling Interests rate (%) 49.7 % 30.5 % 68.6 % 79.7 % 56.0 % Current assets ￦ 408,484 ￦ 1,991,152 ￦ 124,420 ￦ 302,953 ￦ 409,345 Non-current assets 867,161 1,942,275 244,941 113,797 81,049 Current liabilities 249,676 1,658,476 103,927 189,641 248,648 Non-current liabilities 220,018 822,528 73,691 44,530 19,970 Equity 805,951 1,452,423 191,743 182,579 221,776 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 Total comprehensive income 74,995 122,578 28,669 16,914 27,991 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 year 80,672 326,482 30,521 63,884 71,396 December 31, 2022 (in millions of Korean won) KT Skylife BC Card Co., KTIS KTCS Nasmedia, Non-controlling Interests rate (%) 49.8 % 30.5 % 66.7 % 78.3 % 56.0 % 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 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 Total comprehensive income 34,485 143,055 13,502 17,500 26,996 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 year 98,695 435,047 24,944 61,814 86,133
Summary of Changes in Ownership Interest on the Equity Attributable to Owners	(in millions of Korean won) 2020 2021 2022 Carrying amount of non-controlling interests acquired ￦ 1,750 ￦ 14,702 ￦ 19,272 Consideration paid to non-controlling interests 9,878 1,095 69,652 Effect of changes in equity (net amount) ￦ 11,628 ￦ 15,797 ￦ 88,924

Business Combination (Tables)

Business Combination (Tables)	12 Months Ended
	Dec. 31, 2022
Text block [abstract]
Schedule of Values of Assets and Liabilities Acquired on the Acquisition Date from Major Business Combinations	The details of major business combinations that occurred for the year ended December 31, 2022, are as follows : (in millions of Korean won) Major transfer business Business Transfer price SPARK AND ASSOCIATES INC. Network service industry Oct. 4, 2022 20,328
Schedule of Fair Value of Assets and Liabilities Recognized as a Result of Acquisition at Acquisition Date	The values of assets and liabilities acquired on the acquisition date from major business combinations for the year ended December 31, 2022, are as follows: (in millions of Korean won) SPARK AND I. Total transfer price (A) ￦ 20,328 II. Amount recognized as identifiable assets and liabilities Fair value of identifiable assets 11,446 Cash and cash equivalents 427 Trade and other receivables, net 1,039 Property and equipment, net 23 Intangible assets, net 9,715 Other assets 242 Fair value of identifiable liabilities 2,793 Trade and other payables 410 Current income tax liabilities 32 Net defined benefit liabilities 21 Other liabilities 2,330 Total identifiable net assets (B) 8,653 III. Non-controlling interest (C) — IV. Fair value of net assets acquired (D=B-C) 8,653 V. Goodwill (E=A-D) ￦ 11,675
Schedule of Intangible Assets Additionally Identified By The Group As A Result Of Major Business Combinations For The Year	Intangible assets additionally identified by the Group as a result of major business combinations for the year ended December 31, 2022, are as follows: (in millions of Korean won) Goodwill Customer SPARK AND ASSOCIATES INC. ￦ 11,675 ￦ 9,715
Summary of Operating Income And Net Profit And Loss Before Elimination Of Intercompany Transactions Of The Acquired Companies	Operating revenue and net profit and loss before elimination of intercompany transactions of the acquired companies transferred through major business combinations for the year ended December 31, 2022, are as follows: (in millions of Korean won) After business 2022 1 Operating Profit (loss) for Operating Profit (loss) for SPARK AND ASSOCIATES INC. ￦ 1,637 ￦ 413 ￦ 6,856 ￦ 670 1 Operating revenue and profit or loss of the entity for the current reporting period as though th e acquisition date f

Events after Reporting Period (

Events after Reporting Period (Tables)	12 Months Ended
	Dec. 31, 2022
Text block [abstract]
Summary of Public Bonds Issued After Reporting Period	The Group has issued the following bonds since the end of the reporting period. Type Issuance date Face value (in millions Interest Redemption The 198-1st Public bond Jan. 12, 2023 ￦ 70,000 3.847 % Jan. 10, 2025 The 198-2nd Public bond Jan. 12, 2023 150,000 3.869 % Jan. 12, 2026 The 198-3rd Public bond Jan. 12, 2023 80,000 3.971 % Jan. 12, 2028

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, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure of subsidiaries [line items]
Total assets	₩ 40,989,810	₩ 37,159,341
Total liabilities	22,577,114	20,592,180
Operating revenues	25,638,855	24,898,005	₩ 24,099,394
Profit (loss) for the year	₩ 1,385,635	₩ 1,459,395	₩ 746,256
KT Linkus Co., Ltd [member]
Disclosure of subsidiaries [line items]
Subsidiary	KT Linkus Co., Ltd.	KT Linkus Co., Ltd	KT Linkus Co., Ltd.
Type of Business	Public telephone maintenance
Location	Korea
Controlling percentage ownership	92.40%	92.40%
Closing month	December
Total assets	₩ 47,734
Total liabilities	47,498
Operating revenues	76,135
Profit (loss) for the year	₩ (614)
KT Submarine Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Subsidiary	KT Submarine Co., Ltd.	KT Submarine Co., Ltd.	KT Submarine Co., Ltd.
Type of Business	Submarine cable construction and maintenance
Location	Korea
Controlling percentage ownership	32.90%	39.30%
Closing month	December
Total assets	₩ 120,255	₩ 110,390	₩ 116,813
Total liabilities	7,884	10,736	14,032
Operating revenues	42,848	31,374	110,201
Profit (loss) for the year	₩ (12,126)	₩ (3,183)	₩ 1,197
KT Telecop Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Subsidiary	KT Telecop Co., Ltd.	KT Telecop Co., Ltd.	KT Telecop Co., Ltd.
Type of Business	Security service
Location	Korea
Controlling percentage ownership	86.80%	86.80%
Closing month	December
Total assets	₩ 370,004	₩ 363,224	₩ 318,456
Total liabilities	230,965	233,797	193,737
Operating revenues	517,406	515,456	392,489
Profit (loss) for the year	₩ 4,267	₩ 3,985	₩ 212
KT Alpha Co., Ltd. (KT Hitel Co., Ltd.) [member]
Disclosure of subsidiaries [line items]
Subsidiary	KT Alpha Co., Ltd. (KT Hitel Co., Ltd.)	KT Alpha Co., Ltd. (KT Hitel Co., Ltd.)	KT Alpha Co., Ltd. (KT Hitel Co., Ltd.)
Type of Business	Data communication
Location	Korea
Controlling percentage ownership	73%	73%
Closing month	December
Total assets	₩ 406,236	₩ 390,671	₩ 288,949
Total liabilities	172,211	172,767	92,599
Operating revenues	516,737	471,870	350,231
Profit (loss) for the year	₩ 13,115	₩ (8,692)	₩ 2,080
KT Service Bukbu Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Subsidiary	KT Service Bukbu Co., Ltd.	KT Service Bukbu Inc.	KT Service Bukbu Inc.
Type of Business	Opening services of fixed line
Location	Korea
Controlling percentage ownership	67.30%	67.30%
Closing month	December
Total assets	₩ 74,673	₩ 59,341	₩ 60,825
Total liabilities	65,820	54,070	56,554
Operating revenues	252,304	231,602	217,451
Profit (loss) for the year	₩ 3,227	₩ 1,128	₩ (871)
KT Service Nambu Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Subsidiary	KT Service Nambu Co., Ltd.	KT Service Nambu Inc.	KT Service Nambu Inc.
Type of Business	Opening services of fixed line
Location	Korea
Controlling percentage ownership	77.30%	77.30%
Closing month	December
Total assets	₩ 80,450	₩ 62,513	₩ 58,182
Total liabilities	66,479	52,695	51,460
Operating revenues	301,720	271,174	264,776
Profit (loss) for the year	₩ 3,067	₩ 1,430	₩ (456)
KT Commerce Inc. [member]
Disclosure of subsidiaries [line items]
Subsidiary	KT Commerce Inc.
Type of Business	B2C, B2B service
Location	Korea
Controlling percentage ownership	100%	100%
Closing month	December
KT Strategic Investment Fund No.2 [member]
Disclosure of subsidiaries [line items]
Subsidiary	KT Strategic Investment Fund No.2
Type of Business	Investment fund
Location	Korea
Controlling percentage ownership	100%	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	₩ 5,666,075	₩ 3,933,427	₩ 3,084,398
Total liabilities	4,109,200	2,481,004	1,778,751
Operating revenues	3,897,090	3,580,970	3,387,640
Profit (loss) for the year	₩ 148,341	₩ 120,308	₩ 39,455
VP Inc. [Member]
Disclosure of subsidiaries [line items]
Subsidiary	VP Inc.
Type of Business	Payment security service for credit card, others
Location	Korea
Controlling percentage ownership	69.70%	50.90%
Closing month	December
H&C Network [member]
Disclosure of subsidiaries [line items]
Subsidiary	H&C Network	H&C Network Co., Ltd.	H&C Network
Type of Business	Call center for financial sectors
Location	Korea
Controlling percentage ownership	100%	100%
Closing month	December
Total assets	₩ 82,737	₩ 88,616	₩ 269,651
Total liabilities	6,640	4,993	61,365
Operating revenues	27,392	227,604	322,690
Profit (loss) for the year	₩ 992	₩ 11,995	₩ 2,413
BC Card China Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Subsidiary	BC Card China Co., Ltd.
Type of Business	Software development and data processing
Location	China
Controlling percentage ownership	100%	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	61.30%	58.20%
Closing month	December
Smartro Co., Ltd. [Member]
Disclosure of subsidiaries [line items]
Subsidiary	Smartro Co., Ltd
Type of Business	VAN (Value Added Network) business
Location	Korea
Controlling percentage ownership	64.50%	64.50%
Closing month	December
KTDS Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Subsidiary	KTDS Co., Ltd.	KTDS Co., Ltd.	KTDS Co., Ltd.
Type of Business	System integration and maintenance
Location	Korea
Controlling percentage ownership	95.60%	95.50%
Closing month	December
Total assets	₩ 401,932	₩ 341,358	₩ 183,297
Total liabilities	228,474	199,831	133,129
Operating revenues	723,161	632,899	499,990
Profit (loss) for the year	₩ 30,941	₩ 21,464	₩ 10,635
KT M&S Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Subsidiary	KT M&S Co., Ltd.	KT M&S Co., Ltd.	KT M&S Co., Ltd.
Type of Business	PCS distribution
Location	Korea
Controlling percentage ownership	100%	100%
Closing month	December
Total assets	₩ 255,310	₩ 241,377	₩ 231,260
Total liabilities	204,336	203,051	197,306
Operating revenues	730,802	710,634	661,533
Profit (loss) for the year	₩ 8,105	₩ 3,496	₩ (485)
GENIE Music Corporation [Member]
Disclosure of subsidiaries [line items]
Subsidiary	GENIE Music Corporation		GENIE Music Corporation
Type of Business	Online music production and distribution
Location	Korea
Controlling percentage ownership	36%	36.20%
Closing month	December
Total assets			₩ 250,538
Total liabilities			88,488
Operating revenues			247,237
Profit (loss) for the year			₩ 9,472
KT MOS Bukbu Co.,Ltd. [member]
Disclosure of subsidiaries [line items]
Subsidiary	KT MOS Bukbu Co., Ltd.	KT MOS Bukbu Co., Ltd.	KT MOS Bukbu Co., Ltd.
Type of Business	Telecommunication facility maintenance
Location	Korea
Controlling percentage ownership	100%	100%
Closing month	December
Total assets	₩ 38,684	₩ 32,511	₩ 32,167
Total liabilities	22,553	25,402	26,070
Operating revenues	83,085	70,212	67,975
Profit (loss) for the year	₩ 4,607	₩ 1,637	₩ 1,473
KT MOS Nambu Co., Ltd [member]
Disclosure of subsidiaries [line items]
Subsidiary	KT MOS Nambu Co., Ltd.	KT MOS Nambu Co., Ltd.	KT MOS Nambu Co., Ltd.
Type of Business	Telecommunication facility maintenance
Location	Korea
Controlling percentage ownership	98.40%	98.40%
Closing month	December
Total assets	₩ 42,011	₩ 36,741	₩ 33,765
Total liabilities	25,416	26,053	24,947
Operating revenues	83,330	71,940	71,259
Profit (loss) for the year	₩ 5,035	₩ 2,016	₩ 1,639
KT Skylife Co Ltd [member]
Disclosure of subsidiaries [line items]
Subsidiary	KT Skylife Co., Ltd.	KT Skylife Co., Ltd.	KT Skylife Co., Ltd.
Total assets	₩ 1,359,166	₩ 1,275,645	₩ 919,476
Total liabilities	503,679	469,694	175,039
Operating revenues	1,038,468	772,950	706,631
Profit (loss) for the year	₩ 20,941	₩ 62,309	₩ 58,190
KT Skylife [Member]
Disclosure of subsidiaries [line items]
Subsidiary	KT Skylife
Type of Business	Satellite TV
Location	Korea
Controlling percentage ownership	50.20%	50.30%
Closing month	December
Skylife TV Co., Ltd. [Member]
Disclosure of subsidiaries [line items]
Subsidiary	Skylife TV Co., Ltd.
Type of Business	TV contents provider
Location	Korea
Controlling percentage ownership	100%	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	₩ 2,480,333	₩ 2,370,940	₩ 1,689,601
Total liabilities	833,842	791,884	325,429
Operating revenues	478,188	577,578	365,335
Profit (loss) for the year	₩ 58,780	₩ 213,203	₩ 14,370
KT Investment Management Inc. (KT AMC Co., Ltd.) [Member]
Disclosure of subsidiaries [line items]
Subsidiary	KT Investment Management Inc. (KT AMC Co., Ltd.)
Type of Business	Asset management, real estate and consulting services
Location	Korea
Controlling percentage ownership	100%	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.
Type of Business	Data center development and related service
Location	Korea
Controlling percentage ownership	100%	100%
Closing month	December
Total assets	₩ 12,059	₩ 11,464
Total liabilities	1,596	1,560
Operating revenues	4,323	4,423
Profit (loss) for the year	₩ 451	₩ 553
KT Sat Co., Ltd. [Member]
Disclosure of subsidiaries [line items]
Subsidiary	KT Sat Co., Ltd.
Type of Business	Satellite communication business
Location	Korea
Controlling percentage ownership	100%	100%
Closing month	December
Total assets	₩ 677,980
Total liabilities	89,644
Operating revenues	185,313
Profit (loss) for the year	₩ 28,073
Nasmedia, Co., Ltd. [Member]
Disclosure of subsidiaries [line items]
Subsidiary	Nasmedia, Co., Ltd
Type of Business	Solution provider and IPTV advertisement sales business
Location	Korea
Controlling percentage ownership	44%	44%
Closing month	December
KT Sports Co., Ltd. [Member]
Disclosure of subsidiaries [line items]
Subsidiary	KT Sports Co., Ltd.
Type of Business	Management of sports teams
Location	Korea
Controlling percentage ownership	100%	100%
Closing month	December
Total assets	₩ 28,220
Total liabilities	15,461
Operating revenues	65,350
Profit (loss) for the year	₩ (7,302)
K T Music Contents Fund No.2 [member]
Disclosure of subsidiaries [line items]
Subsidiary	KT Music Contents Fund No.2	KT Music Contents Fund No.2	KT Music Contents Fund No.2
Type of Business	Music and contents investment business
Location	Korea
Controlling percentage ownership	100%	100%
Closing month	December
Total assets	₩ 15,718	₩ 14,985	₩ 15,021
Total liabilities	277	278	285
Operating revenues	1,040	253	169
Profit (loss) for the year	₩ 735	₩ (30)	₩ (116)
KT-Michigan global contents fund [member]
Disclosure of subsidiaries [line items]
Subsidiary	KT-Michigan Global Content Fund	KT-Michigan Global Contents Fund	KT-Michigan Global Contents Fund
Type of Business	Content investment business
Location	Korea
Controlling percentage ownership	88.60%	88.60%
Closing month	December
Total assets	₩ 2,371	₩ 3,552	₩ 10,382
Total liabilities	27	112	175
Operating revenues	33	13,592	111
Profit (loss) for the year	₩ (1,095)	₩ 10,032	₩ (1,420)
KTCS Corporation [member]
Disclosure of subsidiaries [line items]
Subsidiary	KTCS Corporation	KTCS Corporation	KTCS Corporation
Type of Business	Database and online information provider
Location	Korea
Controlling percentage ownership	34.10%	32.20%
Closing month	December
Total assets	₩ 419,726	₩ 416,750	₩ 384,919
Total liabilities	228,618	234,172	215,175
Operating revenues	1,031,010	968,499	933,006
Profit (loss) for the year	₩ 17,634	₩ 19,034	₩ 11,323
KTIS Corporation [member]
Disclosure of subsidiaries [line items]
Subsidiary	KTIS Corporation	KTIS Corporation	KTIS Corporation
Type of Business	Database and online information provider
Location	Korea
Controlling percentage ownership	33.30%	31.40%
Closing month	December
Total assets	₩ 396,208	₩ 369,361	₩ 294,289
Total liabilities	199,204	177,619	126,894
Operating revenues	536,229	487,801	454,172
Profit (loss) for the year	₩ 15,917	₩ 24,944	₩ 7,387
KT M Mobile Co., Ltd. [Member]
Disclosure of subsidiaries [line items]
Subsidiary	KT M Mobile Co., Ltd.
Type of Business	Special category telecommunications operator and sales of communication device
Location	Korea
Controlling percentage ownership	100%	100%
Closing month	December
Total assets	₩ 152,114
Total liabilities	49,816
Operating revenues	262,918
Profit (loss) for the year	₩ 4,731
KT Investment Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Subsidiary	KT Investment Co., Ltd.	KT Investment Co., Ltd.	KT Investment Co., Ltd.
Type of Business	Financing business for new technology
Location	Korea
Controlling percentage ownership	100%	100%
Closing month	December
Total assets	₩ 103,354	₩ 87,366	₩ 115,627
Total liabilities	79,182	66,108	93,695
Operating revenues	15,136	21,040	47,801
Profit (loss) for the year	₩ 2,840	₩ (697)	₩ 4,680
PlayD Co., Ltd. [Member]
Disclosure of subsidiaries [line items]
Subsidiary	PlayD Co., Ltd.
Type of Business	Advertising agency
Location	Korea
Controlling percentage ownership	70.40%	70.40%
Closing month	December
Next Connect PFV Inc. [member]
Disclosure of subsidiaries [line items]
Subsidiary	Next Connect PFV	Next Connect PFV Inc.	Next Connect PFV Inc.
Type of Business	Residential building development and supply
Location	Korea
Controlling percentage ownership	100%	100%
Closing month	December
Total assets		₩ 518,441	₩ 394,268
Total liabilities		167,963	37,271
Operating revenues		0	26
Profit (loss) for the year		₩ (6,519)	₩ (7,101)
KT Rwanda Networks Ltd. [member]
Disclosure of subsidiaries [line items]
Subsidiary	KT Rwanda Networks Ltd.	KT Rwanda Networks Ltd.	KT Rwanda Networks Ltd.
Type of Business	Network installation and management
Location	Rwanda
Controlling percentage ownership	51%	51%
Closing month	December
Total assets	₩ 126,721	₩ 125,860	₩ 114,768
Total liabilities	267,369	236,389	191,781
Operating revenues	30,834	23,328	17,870
Profit (loss) for the year	₩ (27,467)	₩ (28,770)	₩ (34,610)
AOS Ltd. [member]
Disclosure of subsidiaries [line items]
Subsidiary	AOS Ltd.	AOS Ltd.	AOS Ltd.
Type of Business	System integration and maintenance
Location	Rwanda
Controlling percentage ownership	51%	51%
Closing month	December
Total assets	₩ 10,972	₩ 11,539	₩ 11,812
Total liabilities	905	2,812	3,875
Operating revenues	8,049	6,942	5,719
Profit (loss) for the year	₩ 1,274	₩ 823	₩ 296
KT Japan Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Subsidiary	KT Japan Co., Ltd.	KT Japan Co., Ltd.	KT Japan Co., Ltd.
Type of Business	Foreign investment business and local counter work
Location	Japan
Controlling percentage ownership	100%	100%
Closing month	December
Total assets	₩ 1,888	₩ 1,474	₩ 2,694
Total liabilities	3,141	2,633	2,622
Operating revenues	3,263	1,298	1,853
Profit (loss) for the year	₩ 226	₩ (142)	₩ 1
East Telecom LLC [member]
Disclosure of subsidiaries [line items]
Subsidiary	East Telecom LLC	East Telecom LLC
Type of Business	Wireless/fixed line internet business
Location	Uzbekistan
Controlling percentage ownership	91.60%	91.60%
Closing month	December
Total assets	₩ 42,691	₩ 35,904
Total liabilities	21,645	22,088
Operating revenues	27,030	11,960
Profit (loss) for the year	₩ 6,419	₩ 2,487
KT America, Inc. [Member]
Disclosure of subsidiaries [line items]
Subsidiary	KT America, Inc.	KT America, Inc.	KT AMERICA, INC
Type of Business	Foreign investment business and local counter work
Location	USA
Controlling percentage ownership	100%	100%
Closing month	December
Total assets	₩ 5,945	₩ 4,884	₩ 4,498
Total liabilities	843	101	125
Operating revenues	8,070	6,508	6,808
Profit (loss) for the year	₩ 37	₩ 201	₩ 712
PT BC card Asia Pacific [member]
Disclosure of subsidiaries [line items]
Subsidiary	PT. BC Card Asia Pacific
Type of Business	Software development and supply
Location	Indonesia
Controlling percentage ownership	99.90%	99.90%
Closing month	December
KT Hong Kong Telecommunications Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Subsidiary	KT Hong Kong Telecommunications Co., Ltd.	KT Hong Kong Telecommunications Co., Ltd.	KT Hong Kong Telecommunications Co., Ltd.
Type of Business	Fixed line telecommunication business
Location	Hong Kong
Controlling percentage ownership	100%	100%
Closing month	December
Total assets	₩ 10,505	₩ 6,613	₩ 6,159
Total liabilities	4,768	1,346	2,800
Operating revenues	20,413	18,825	16,386
Profit (loss) for the year	₩ 51	₩ 1,313	₩ 1,308
Korea Telecom Singapore Pte.Ltd. [member]
Disclosure of subsidiaries [line items]
Subsidiary	Korea Telecom Singapore Pte. Ltd.
Type of Business	Foreign investment business and local counter work
Location	Singapore
Controlling percentage ownership	100%	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
Type of Business	Manufacturing
Location	Korea
Controlling percentage ownership	100%	100%
Closing month	December
Total assets	₩ 6,984
Total liabilities	2,582
Operating revenues	22,860
Profit (loss) for the year	₩ 494
K-REALTY RENTAL HOUSING REIT 3 [member]
Disclosure of subsidiaries [line items]
Subsidiary	K-REALTY RENTAL HOUSING REIT 3
Type of Business	Residential building
Location	Korea
Controlling percentage ownership	88.60%	88.60%
Closing month	December
Storywiz Co Ltd [Member]
Disclosure of subsidiaries [line items]
Subsidiary	Storywiz Co., Ltd.		Storywiz Co., Ltd
Type of Business	Contents and software development and supply
Location	Korea
Controlling percentage ownership	100%	100%
Closing month	December
Total assets			₩ 21,594
Total liabilities			10,065
Operating revenues			19,209
Profit (loss) for the year			₩ (1,954)
KT Engineering Co., Ltd. [Member]
Disclosure of subsidiaries [line items]
Subsidiary	KT Engineering Co., Ltd.
Type of Business	Telecommunication facility construction and maintenance
Location	Korea
Controlling percentage ownership	100%	100%
Closing month	December
KT Studio Genie Co Ltd [Member]
Disclosure of subsidiaries [line items]
Subsidiary	KT Studio Genie Co., Ltd.	KT Studio Genie Co., Ltd.
Type of Business	Data communication service and data communication construction business
Location	Korea
Controlling percentage ownership	90.90%	100%
Closing month	December
Total assets	₩ 987,270	₩ 648,534
Total liabilities	268,911	276,933
Operating revenues	723,580	90,047
Profit (loss) for the year	₩ 189,498	₩ (16,443)
KHS Corporation [Member]
Disclosure of subsidiaries [line items]
Subsidiary	KHS Corporation
Type of Business	Operation and maintenance of facilities
Location	Korea
Controlling percentage ownership	100%	100%
Closing month	December
Lolab Co Ltd [Member]
Disclosure of subsidiaries [line items]
Subsidiary	Lolab Co., Ltd.	Lolab Co., Ltd.
Type of Business	Truck transportation and trucking arrangement business
Location	Korea
Controlling percentage ownership	79.80%	80%
Closing month	December
Total assets	₩ 35,091	₩ 26,726
Total liabilities	17,247	897
Operating revenues	74,881	2,107
Profit (loss) for the year	₩ (7,985)	₩ (134)
HCN Co Ltd [Member]
Disclosure of subsidiaries [line items]
Subsidiary	HCN Co., Ltd.
Type of Business	Cable television service
Location	Korea
Controlling percentage ownership	100%	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	38.60%	38.60%
Closing month	December
KT ES Pte Ltd [Member]
Disclosure of subsidiaries [line items]
Subsidiary	KT ES Pte. Ltd.	KT ES Pte. Ltd.
Type of Business	Foreign investment business
Location	Singapore
Controlling percentage ownership	57.60%	57.60%
Closing month	December
Total assets	₩ 240,721	₩ 240,331
Total liabilities	88,640	80,597
Operating revenues	78,815	15,157
Profit (loss) for the year	₩ (23,957)	₩ (6,355)
Epsilon Global Communications Pte. Ltd [Member]
Disclosure of subsidiaries [line items]
Subsidiary	Epsilon Global Communications PTE. Ltd.
Type of Business	Network service industry
Location	Singapore
Controlling percentage ownership	100%	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 [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 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
Epsilon M E A General Trading LLC [Member]
Disclosure of subsidiaries [line items]
Subsidiary	Epsilon M E A General Trading LLC
Type of Business	Local counter work
Location	United Arab Emirates
Controlling percentage ownership	49%	49%
Closing month	December
Nasmedia KT Alpha Future Growth Strategic Investment Fund [Member]
Disclosure of subsidiaries [line items]
Subsidiary	Nasmedia-KT Alpha Future Growth Strategic Investment Fund
Type of Business	Investment fund
Location	Korea
Controlling percentage ownership	100%	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
Alticast Company Limited [Member]
Disclosure of subsidiaries [line items]
Subsidiary	Alticast Company Limited
Type of Business	Software development and delivery
Location	Vietnam
Controlling percentage ownership	100%	100%
Closing month	December
Altimedia Corporation [Member]
Disclosure of subsidiaries [line items]
Subsidiary	Altimedia Corporation	Altimedia Corporation
Type of Business	Software development and delivery
Location	Korea
Controlling percentage ownership	100%	100%
Closing month	December
Total assets	₩ 44,861	₩ 32,338
Total liabilities	15,777	9,742
Operating revenues	47,203	6,968
Profit (loss) for the year	₩ 6,035	₩ 1,037
Alticast B V [Member]
Disclosure of subsidiaries [line items]
Subsidiary	Alticast B.V.
Type of Business	Software development and delivery
Location	Netherlands
Controlling percentage ownership	100%	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
KTP SERVICES INC. [Member]
Disclosure of subsidiaries [line items]
Subsidiary	KTP SERVICES INC.
Type of Business	Fixed line telecommunication business
Location	Philippines
Controlling percentage ownership	100%	100%
Closing month	December
Total assets	₩ 3,832
Total liabilities	2,044
Operating revenues	776
Profit (loss) for the year	₩ (255)
KT RUS LLC [Member]
Disclosure of subsidiaries [line items]
Subsidiary	KT RUS LLC
Type of Business	Foreign investment business
Location	Russia
Controlling percentage ownership	100%
Closing month	December
Total assets	₩ 967
Total liabilities	16
Operating revenues	5
Profit (loss) for the year	₩ (871)
Hangang Real Estate Investment Trust No. 24 [Member]
Disclosure of subsidiaries [line items]
Subsidiary	Hangang Real Estate Investment Trust No. 24
Type of Business	Investment fund
Location	Korea
Controlling percentage ownership	75%
Closing month	December
kt cloud Co., Ltd. [Member]
Disclosure of subsidiaries [line items]
Subsidiary	kt cloud Co., Ltd.
Type of Business	Information telecommunication business
Location	Korea
Controlling percentage ownership	100%
Closing month	December
Total assets	₩ 1,348,684
Total liabilities	245,872
Operating revenues	432,118
Profit (loss) for the year	₩ 14,712
KT DX Vietnam Company Limited [Member]
Disclosure of subsidiaries [line items]
Subsidiary	KT DX Vietnam Company Limited
Type of Business	Software development
Location	Vietnam
Controlling percentage ownership	100%
Closing month	December
Total assets	₩ 1,815
Total liabilities	6
Operating revenues	0
Profit (loss) for the year	₩ 26
Pocheon Jeonggyori Development Co., Ltd. [Member]
Disclosure of subsidiaries [line items]
Subsidiary	Pocheon Jeonggyori Development Co., Ltd.
Type of Business	Residential building development
Location	Korea
Controlling percentage ownership	80.90%
Closing month	December
Alpha DX Solution Co., Ltd. [Member]
Disclosure of subsidiaries [line items]
Subsidiary	Alpha DX Solution Co., Ltd.
Type of Business	Data communication service
Location	Korea
Controlling percentage ownership	100%
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%
Closing month	December
KT Primorye IDC LLC [Member]
Disclosure of subsidiaries [line items]
Subsidiary	KT Primorye IDC LLC
Type of Business	Data processing and associated service delivery
Location	Russia
Controlling percentage ownership	99%
Closing month	December
Juice Inc. [Member]
Disclosure of subsidiaries [line items]
Subsidiary	Juice Inc.
Type of Business	Online information provider/Software development and delivery
Location	Korea
Controlling percentage ownership	41.20%
Closing month	December
Spark and Associates Inc. [Member]
Disclosure of subsidiaries [line items]
Subsidiary	SPARK AND ASSOCIATES INC.
Type of Business	Network service industry
Location	Korea
Controlling percentage ownership	100%
Closing month	December
KT Powertel Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Subsidiary			KT Powertel Co., Ltd.
Total assets			₩ 119,694
Total liabilities			18,833
Operating revenues			65,897
Profit (loss) for the year			3,809
KT Linkus Co Ltd [member]
Disclosure of subsidiaries [line items]
Total assets		₩ 54,219	58,372
Total liabilities		53,316	54,022
Operating revenues		81,434	84,519
Profit (loss) for the year		₩ (3,095)	₩ (3,212)
KT Sports Inc [member]
Disclosure of subsidiaries [line items]
Subsidiary			KT Sports Inc.
Total assets			₩ 26,572
Total liabilities			14,940
Operating revenues			46,608
Profit (loss) for the year			₩ (2,516)
KT music contents fund no.1 [member]
Disclosure of subsidiaries [line items]
Subsidiary			KT Music Contents Fund No.1
Total assets			₩ 4,844
Total liabilities			1,525
Operating revenues			243
Profit (loss) for the year			₩ 84
KT Sat Inc. [member]
Disclosure of subsidiaries [line items]
Subsidiary		KT Sat Inc.	KT Sat Inc.
Total assets		₩ 593,616	₩ 630,740
Total liabilities		34,169	92,791
Operating revenues		174,750	173,693
Profit (loss) for the year		₩ 20,830	₩ 14,753
KBTO sp.zo.o. [member]
Disclosure of subsidiaries [line items]
Subsidiary			KBTO sp.z o.o.
Total assets			₩ 438
Total liabilities			117
Operating revenues			490
Profit (loss) for the year			₩ (2,823)
Autopion Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Subsidiary			Autopion Co., Ltd.
Total assets			₩ 4,903
Total liabilities			4,961
Operating revenues			6,174
Profit (loss) for the year			₩ (2,459)
Korea Telecom China Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Subsidiary			Korea Telecom China Co., Ltd.
Total assets			₩ 381
Total liabilities			21
Operating revenues			618
Profit (loss) for the year			₩ (492)
KT Hopemate [member]
Disclosure of subsidiaries [line items]
Subsidiary		KT Hopemate	KT Hopemate
Total assets		₩ 6,311	₩ 3,720
Total liabilities		2,978	2,787
Operating revenues		12,538	5,239
Profit (loss) for the year		₩ 116	₩ (13)
KT M mobile Inc. [member]
Disclosure of subsidiaries [line items]
Subsidiary		KT M Mobile Inc.	KT M Mobile Inc.
Total assets		₩ 144,175	₩ 129,011
Total liabilities		40,749	27,281
Operating revenues		204,641	163,472
Profit (loss) for the year		₩ 5,918	₩ (3,617)
GE Premier 1st Corporate Restructuring Real Estate Investment Trust Co. [member]
Disclosure of subsidiaries [line items]
Subsidiary			GE Premier 1st Corporate Restructuring Real Estate Investment Trust Co.
Total assets			₩ 5,703
Total liabilities			1,165
Operating revenues			333
Profit (loss) for the year			₩ 83
KT Dutch B.V. [member]
Disclosure of subsidiaries [line items]
Subsidiary			KT Dutch B.V.
Total assets			₩ 29,585
Total liabilities			10,109
Operating revenues			26,782
Profit (loss) for the year			₩ 6,061
KT Belgium [member]
Disclosure of subsidiaries [line items]
Subsidiary			KT Belgium
Total assets			₩ 87,608
Total liabilities			0
Operating revenues			(81)
Profit (loss) for the year			₩ (81)
KT Engineering Co Ltd KT ENGCORE Co Ltd [Member]
Disclosure of subsidiaries [line items]
Subsidiary	KT Engineering Co., Ltd. (KT ENGCORE Co., Ltd.)	KT Engineering Co., Ltd. (KT ENGCORE Co., Ltd.)	KT Engineering Co., Ltd. (KT ENGCORE Co., Ltd.)
Total assets	₩ 141,463	₩ 185,850	₩ 138,220
Total liabilities	89,853	144,832	102,963
Operating revenues	258,435	284,998	346,040
Profit (loss) for the year	₩ 10,302	₩ 366	₩ (8,461)
Nasmedia Co Ltd [member]
Disclosure of subsidiaries [line items]
Subsidiary	Nasmedia Co., Ltd.	Nasmedia Co., Ltd.	Nasmedia Co., Ltd.
Total assets	₩ 516,945	₩ 490,394	₩ 422,039
Total liabilities	275,730	268,618	221,371
Operating revenues	153,211	125,876	113,136
Profit (loss) for the year	27,691	₩ 27,120	₩ 23,134
KT M Hows Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Subsidiary			KT M Hows Co., Ltd.
Total assets			₩ 104,704
Total liabilities			76,315
Operating revenues			44,860
Profit (loss) for the year			₩ 6,935
KTGDH Co., Ltd. (KTSB Data service) [member]
Disclosure of subsidiaries [line items]
Subsidiary			KTGDH Co., Ltd. (KTSB Data Service)
Total assets			₩ 11,003
Total liabilities			1,669
Operating revenues			4,282
Profit (loss) for the year			₩ 538
KT Philippines [Member]
Disclosure of subsidiaries [line items]
Subsidiary		KT Philippines
Total assets		₩ 3,641
Total liabilities		1,243
Operating revenues		0
Profit (loss) for the year		₩ 0
KT Sports Inc.[member]
Disclosure of subsidiaries [line items]
Subsidiary		KT Sports Inc.
Total assets		₩ 29,524
Total liabilities		19,740
Operating revenues		67,612
Profit (loss) for the year		₩ (2,039)
Next Connect PFV [Member]
Disclosure of subsidiaries [line items]
Subsidiary		Next Connect PFV
Total assets	624,734
Total liabilities	277,967
Operating revenues	3
Profit (loss) for the year	₩ (3,712)

Significant Accounting Polici_4

Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2022
Disclosure of significant accounting policies [line items]
Derecognition of financial liabilities, percent	10%
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

Significant Accounting Polici_5

Significant Accounting Policies - Summary of Estimated Useful Lives of Property, Plant and Equipment (Detail)	12 Months Ended
	Dec. 31, 2022
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	6 years

Significant Accounting Polici_6

Significant Accounting Policies - Summary of Amortization of Intangible Assets With Limited Useful Life (Detail)	12 Months Ended
	Dec. 31, 2022
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	7 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	7 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, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disclosure of detailed information about financial instruments [line items]
Trade and other payables	₩ 8,397,264	₩ 7,980,203
Borrowings	10,006,685	8,437,703
Other financial liabilities	421,441	497,666
Lease liabilities	1,172,038	1,159,369
Cash and cash equivalents	2,449,062	3,019,592	₩ 2,634,624	₩ 2,305,894
Trade and other receivables	7,589,118	6,178,816
Other financial assets	3,823,936	2,008,038
Loans and receivables [member]
Disclosure of detailed information about financial instruments [line items]
Cash and cash equivalents	2,449,062	3,019,592
Trade and other receivables	7,459,994	5,687,103
Other financial assets	1,060,058	608,389
Financial assets at fair value through profit or loss [member]
Disclosure of detailed information about financial instruments [line items]
Other financial assets	1,064,856	952,319
Derivative used for hedge [member]
Disclosure of detailed information about financial instruments [line items]
Other financial liabilities	33,555	18,126
Other financial assets	190,830	99,453
Financial liabilities designated as at fair value through profit or loss [member]
Disclosure of detailed information about financial instruments [line items]
Other financial liabilities	141,280	216,040
Financial liabilities at amortized cost [member]
Disclosure of detailed information about financial instruments [line items]
Trade and other payables	8,397,264	7,980,203
Borrowings	10,006,685	8,437,703
Other financial liabilities	246,606	263,500
Financial assets at fair value through other comprehensive income [member]
Disclosure of detailed information about financial instruments [line items]
Trade and other receivables	129,124	491,713
Other financial assets	1,508,192	347,877
Others [member]
Disclosure of detailed information about financial instruments [line items]
Lease liabilities	₩ 1,172,038	₩ 1,159,369

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, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure of detailed information about financial instruments [line items]
Interest income	₩ 271,925	₩ 273,460	₩ 270,571
Interest expense	(293,854)	(263,389)	(263,579)
Total	(353,980)	215,095	(38,610)
Other comprehensive income (loss) for the year	(2,194)	165,567	23,255
Reclassified to profit or loss from other comprehensive income (loss) for the year	(95,421)	(136,583)
Interest expense	(41,469)	(36,651)	(44,091)
Financial liabilities designated as at fair value through profit or loss [member]
Disclosure of detailed information about financial instruments [line items]
Interest expense	(4,046)
Gain (loss) foreign currency transaction	24	(2)
Gain (loss) on disposal		2,136	799
Gain (loss) on valuation	30,031	42,447	119
Derivatives used for hedging [member]
Disclosure of detailed information about financial instruments [line items]
Gain on transactions	(1,291)	(6,208)	1,141
Gain (loss) on valuation	(17,237)	(7,206)	(161,003)
Other comprehensive income (loss) for the year	(23,957)	(3,112)	(81,671)
Reclassified to profit or loss from other comprehensive income (loss) for the year	15,195	6,722	107,786
Financial liabilities at amortized cost [member]
Disclosure of detailed information about financial instruments [line items]
Interest expense	(275,302)	(232,197)	(220,945)
Gain (loss) foreign currency transaction	(34,574)	(3,580)	(10,717)
Gain (loss) on foreign currency translation	(168,577)	(201,623)	141,849
Lease liabilities [member]
Disclosure of detailed information about financial instruments [line items]
Interest expense	(41,469)	(36,650)	(44,091)
Financial assets at amortized cost [member]
Disclosure of detailed information about financial instruments [line items]
Interest income	144,505	74,937	55,742
Gain (loss) foreign currency transaction	23,824	12,826	(19,244)
Gain (loss) on foreign currency translation	(2,151)	2,911	(3,895)
Gain (loss) on disposal	(81)	35	138
Gain (loss) on valuation	(132,102)	(110,286)	(140,474)
Financial assets at fair value through profit or loss [member]
Disclosure of detailed information about financial instruments [line items]
Interest income	6,008	3,673	6,548
Dividend income	4,600	21,499	4,379
Gain (loss) foreign currency transaction	13,711	17,794
Gain (loss) on foreign currency translation	1,100		(38)
Gain (loss) on disposal	2,347	29,974	(329)
Gain (loss) on valuation	(29,282)	64,659	59,044
Financial assets at fair value through other comprehensive income [member]
Disclosure of detailed information about financial instruments [line items]
Interest income	190,281	222,290	227,736
Dividend income	9,522	1,365	56
Gain (loss) on disposal	(62,183)	(22,712)	(8,152)
Gain (loss) on valuation	(61)
Other comprehensive income (loss) for the year	(158,574)	129,780	41,997
Derivatives financial assets for hedging [member]
Disclosure of detailed information about financial instruments [line items]
Gain on transactions	27,628		6,050
Gain (loss) on valuation	150,699	203,961	(2,707)
Other comprehensive income (loss) for the year	88,048	144,967	(2,373)
Reclassified to profit or loss from other comprehensive income (loss) for the year	₩ (110,616)	₩ (143,305)	₩ 3,645

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, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure of detailed information about financial instruments [line items]
Interest income recognized as operating revenue	₩ 271,925	₩ 273,460	₩ 270,571
Interest expense recognized as operating expense	293,854	263,389	263,579
Profit and loss from foreign currency transaction	67,976	19,976	17,493
BC Card Co., Ltd. [member]
Disclosure of detailed information about financial instruments [line items]
Interest income recognized as operating revenue	68,869	27,440	20,854
Interest expense recognized as operating expense	27,060	5,458	1,456
Profit and loss from foreign currency transaction	3,569	2,373	19,687
Dividend income	2,299	1,340	2,059
Gain (loss) on valuation	7,860	₩ 15,459	₩ 40,822
Gain Loss On Valuation Of derivatives	₩ 418

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, 2022	Dec. 31, 2021
Cash and cash equivalents [abstract]
Deposit restricted for governmental project and others	₩ 29,874	₩ 28,219

Trade and Other Receivables - S

Trade and Other Receivables - Summary of Trade and Other Receivables (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2022	Dec. 31, 2021
Disclosure of financial assets [line items]
Trade receivables	₩ 3,090,077	₩ 2,982,867
Other receivables	3,007,995	2,104,623
Trade and other receivables, net	6,098,072	5,087,490
Trade receivables	395,359	592,447
Other receivables	1,095,687	498,879
Total	1,491,046	1,091,326
Gross carrying amount [member]
Disclosure of financial assets [line items]
Trade receivables	3,439,542	3,337,398
Other receivables	3,092,261	2,201,781
Trade and other receivables, net	6,531,803	5,539,179
Trade receivables	408,098	612,654
Other receivables	1,249,096	621,195
Total	1,657,194	1,233,849
Accumulated depreciation, amortisation and impairment [member]
Disclosure of financial assets [line items]
Trade receivables	(342,539)	(346,869)
Other receivables	(82,243)	(93,256)
Trade and other receivables, net	(424,782)	(440,125)
Trade receivables	(1,199)	(2,856)
Other receivables	(136,300)	(108,131)
Total	(137,499)	(110,987)
Present value discount [member]
Disclosure of financial assets [line items]
Trade receivables	(6,926)	(7,662)
Other receivables	(2,023)	(3,902)
Trade and other receivables, net	(8,949)	(11,564)
Trade receivables	(11,540)	(17,351)
Other receivables	(17,109)	(14,185)
Total	₩ (28,649)	₩ (31,536)

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, 2022	Dec. 31, 2021
Trade receivables [member]
Disclosure of financial assets [line items]
Beginning balance	₩ 349,725	₩ 327,315
Provision	64,522	82,329
Write-off/transfer	(69,430)	(62,564)
Changes in consolidation scope	(43)	416
Others	(1,036)	2,229
Ending balance	343,738	349,725
Other receivables [member]
Disclosure of financial assets [line items]
Beginning balance	201,387	204,604
Provision	65,941	23,015
Reversal	(850)	(508)
Write-off/transfer	(49,904)	(25,900)
Changes in consolidation scope	0	(300)
Others	1,969	476
Ending balance	₩ 218,543	₩ 201,387

Trade and Other Receivables -_3

Trade and Other Receivables - Summary of Other Receivables (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure of financial assets [line items]
Receivables 1	₩ 7,589,118	₩ 6,178,816
Other receivables [member]
Disclosure of financial assets [line items]
Loans	98,953	101,718
Receivables 1	2,668,545	1,872,467
Accrued income	32,218	5,933
Refundable deposits	339,450	349,360
Loans receivable	1,013,428	328,753
Finance lease receivables	105,690	85,370
Others	63,941	61,288
Less: Provision for impairment	(218,543)	(201,387)	₩ (204,604)
Other receivables	₩ 4,103,682	₩ 2,603,502

Trade and Other Receivables -_4

Trade and Other Receivables - Summary of Other Receivables (Parenthetical) (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2022	Dec. 31, 2021
BC Card Co., Ltd. [member]
Disclosure of financial assets [line items]
Settlement receivable included in other receivables	₩ 1,960,579	₩ 1,108,936

Other Financial Assets and Li_3

Other Financial Assets and Liabilities - Summary of Other Financial Assets and Liabilities (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2022	Dec. 31, 2021
Other financial assets
Financial assets at amortized cost	₩ 1,060,058	₩ 608,389
Financial assets at fair value through profit or loss	1,064,856	952,319
Financial assets at fair value through other comprehensive income	1,508,192	347,877
Derivatives used for hedging	190,830	99,453
Less: Non-current	(2,501,484)	(822,379)
Current	1,322,452	1,185,659
Other financial liabilities
Financial liabilities at amortized cost	246,606	263,500
Financial liabilities at fair value through profit or loss	141,280	216,040
Derivatives used for hedging	33,555	18,126
Less: Non-current	(412,650)	(424,859)
Current Other financial assets	₩ 8,791	₩ 72,807

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, 2022	Dec. 31, 2021
Disclosure of detailed information about financial instruments [line items]
Derivative Financial Assets	₩ 190,830	₩ 99,453
Korea software financial cooperative [member]
Disclosure of detailed information about financial instruments [line items]
Available-for-sale financial assets investment amount	5,626
Ustream Inc. [member]
Disclosure of detailed information about financial instruments [line items]
Proceeds from the disposal of Subsidiary	102,215	₩ 115,033
Submarine Co Ltd [Member]
Disclosure of detailed information about financial instruments [line items]
Derivative Financial Assets	₩ 18,996

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, 2022	Dec. 31, 2021
Disclosure of financial assets [line items]
Equity Instruments	₩ 1,064,856	₩ 952,319
Less: non-current	(609,887)	(488,040)
Current	454,969	464,279
Equity Instruments Listed [member]
Disclosure of financial assets [line items]
Equity Instruments	26,647	24,285
Equity Instruments Unlisted [member]
Disclosure of financial assets [line items]
Equity Instruments	72,517	64,835
Debt securities [member]
Disclosure of financial assets [line items]
Equity Instruments	942,274	862,481
Derivatives held for trading [member]
Disclosure of financial assets [line items]
Equity Instruments	₩ 23,418	₩ 718

Other Financial Assets and Li_6

Other Financial Assets and Liabilities - Additional Information (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure of detailed information about financial instruments [line items]
Ineffective portion recognized in profit or loss cash flow hedge valuation gain	₩ 11,825	₩ 2,711	₩ 2,707
Reclassified as accumulated other comprehensive income after tax	76,296
Retained earnings of attributable to owners	14,255,316	13,287,390
Disposal of investments in associates and joint ventures	34,828	₩ 10,880	₩ 24
Equity Instruments Listed [member]
Disclosure of detailed information about financial instruments [line items]
Retained earnings of attributable to owners	53,052
Disposal of investments in associates and joint ventures	₩ 206,840

Other Financial Assets and Li_7

Other Financial Assets and Liabilities - Summary of Financial Assets at Fair Value Through Other Comprehensive Income (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2022	Dec. 31, 2021
Financial assets at fair value through other comprehensive income [line items]
Equity Instruments	₩ 1,508,192	₩ 347,877
Less: non-current	(1,508,192)	(259,435)
Current	0	88,442
Equity Instruments Listed [member]
Financial assets at fair value through other comprehensive income [line items]
Equity Instruments	1,006,476	19,079
Equity Instruments Unlisted [member]
Financial assets at fair value through other comprehensive income [line items]
Equity Instruments	496,284	234,048
Debt securities [member]
Financial assets at fair value through other comprehensive income [line items]
Equity Instruments	₩ 5,432	₩ 94,750

Other Financial Assets and Li_8

Other Financial Assets and Liabilities - Summary of Derivative Financial Assets and Liabilities (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2022	Dec. 31, 2021
Disclosure of detailed information about financial instruments [line items]
Assets, Total	₩ 190,830	₩ 99,453
Less: Assets, non-current	(147,141)	(67,889)
Assets, Current	43,689	31,564
Liabilities, Total	33,555	18,126
Less: Liabilities, non-current	(33,555)	(242)
Liabilities, Current	0	17,884
Interest rate swap [member]
Disclosure of detailed information about financial instruments [line items]
Assets, Total	4,236	0
Liabilities, Total	0	77
Currency swap [member]
Disclosure of detailed information about financial instruments [line items]
Assets, Total	186,594	99,453
Liabilities, Total	₩ 33,555	₩ 18,049

Other Financial Assets and Li_9

Other Financial Assets and Liabilities - Summary of Derivative Financial Assets and Liabilities (Parenthetical) (Detail) ₩ in Millions	Dec. 31, 2022 KRW (₩)
Interest Rate Benchmark Reform-Phase 2 [member]
Disclosure of detailed information about financial instruments [line items]
Nominal amount of hedging instruments in hedging relationships to which amendments for interest rate benchmark reform are applied	₩ 100,537

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, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure of detailed information about financial instruments [line items]
Valuation gain	₩ 154,674	₩ 203,961	₩ 0
Valuation loss	21,213	7,206	163,710
Other comprehensive income	85,201	191,570	(113,742)
Interest rate swap [member]
Disclosure of detailed information about financial instruments [line items]
Valuation gain	63	0	0
Valuation loss	490	0	0
Other comprehensive income	4,666	1	(567)
Currency swap [member]
Disclosure of detailed information about financial instruments [line items]
Valuation gain	154,611	203,961	0
Valuation loss	20,723	7,206	161,661
Other comprehensive income	79,781	191,569	(113,175)
Currency forwards [member]
Disclosure of detailed information about financial instruments [line items]
Valuation gain	0	0	0
Valuation loss	0	0	2,049
Other comprehensive income	₩ 754	₩ 0	₩ 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, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure of detailed information about hedged items [line items]
Book value of hedged items	₩ 3,058,980	₩ 2,970,459
Changes in fair value to calculate the ineffective portion of hedges	(193,198)	(185,544)
Cash flow hedge reserves	(5,458)		₩ 25,184
USD
Disclosure of detailed information about hedged items [line items]
Book value of hedged items	2,675,885	2,401,943
Changes in fair value to calculate the ineffective portion of hedges	(170,010)	(177,120)
Cash flow hedge reserves	(13,947)		21,826
JPY
Disclosure of detailed information about hedged items [line items]
Book value of hedged items	3,813	309,072
Changes in fair value to calculate the ineffective portion of hedges	308	7,199
Cash flow hedge reserves	116		269
SGD
Disclosure of detailed information about hedged items [line items]
Book value of hedged items	267,843	249,108
Changes in fair value to calculate the ineffective portion of hedges	(18,720)	(15,570)
Cash flow hedge reserves	3,406		3,071
EUR
Disclosure of detailed information about hedged items [line items]
Book value of hedged items	10,404	10,336
Changes in fair value to calculate the ineffective portion of hedges	(121)	(53)
Cash flow hedge reserves	582		₩ 18
KRW
Disclosure of detailed information about hedged items [line items]
Book value of hedged items	101,035	0
Changes in fair value to calculate the ineffective portion of hedges	(4,655)	0
Cash flow hedge reserves	₩ 4,385	₩ 0

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, 2022	Dec. 31, 2021
Disclosure of detailed information about hedging instruments [line items]
Contract amount	₩ 2,957,474	₩ 2,904,327
Assets	190,830	99,453
Liabilities	33,555	18,126
Changes in fair value to calculate the ineffective portion of hedges	195,905	197,369
USD
Disclosure of detailed information about hedging instruments [line items]
Foreign currency	2,111,509	2,016,350
Contract amount	2,527,626	2,322,085
Assets	160,243	93,948
Liabilities	32,936	77
Changes in fair value to calculate the ineffective portion of hedges	170,856	186,130
JPY
Disclosure of detailed information about hedging instruments [line items]
Foreign currency	400,000	30,000,000
Contract amount	4,357	326,751
Assets	0	0
Liabilities	409	18,049
Changes in fair value to calculate the ineffective portion of hedges	(308)	(7,199)
SGD
Disclosure of detailed information about hedging instruments [line items]
Foreign currency	284,000	284,000
Contract amount	245,208	245,208
Assets	26,351	5,431
Liabilities	0	0
Changes in fair value to calculate the ineffective portion of hedges	20,511	18,387
EUR
Disclosure of detailed information about hedging instruments [line items]
Foreign currency	7,700	7,700
Contract amount	10,283	10,283
Assets	0	74
Liabilities	210	0
Changes in fair value to calculate the ineffective portion of hedges	129	₩ 51
KRW
Disclosure of detailed information about hedging instruments [line items]
Foreign currency	0
Contract amount	170,000
Assets	4,236
Liabilities	0
Changes in fair value to calculate the ineffective portion of hedges	₩ 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, 2022	Dec. 31, 2021
Financial liabilities at fair value through profit or loss
Derivative liabilities held for trading	₩ 141,280	₩ 216,040

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, 2022	Dec. 31, 2021
Disclosure of financial liabilities [line items]
Derivative financial liabilities	₩ 33,555	₩ 18,126
Submarine Co Ltd [Member]
Disclosure of financial liabilities [line items]
Derivative financial liabilities	₩ 930

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, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure of financial liabilities [line items]
Derivative liabilities held for trading	₩ 141,280	₩ 216,040
Valuation gain on financial liabilities [member]
Disclosure of financial liabilities [line items]
Derivative liabilities held for trading	24,683	51,187	₩ 172
Valuation loss on financial liabilities [member]
Disclosure of financial liabilities [line items]
Derivative liabilities held for trading	₩ 1,800	₩ 8,741	₩ 53

Inventories - Summary of Invent

Inventories - Summary of Inventories Net (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2022	Dec. 31, 2021
Disclosure of inventories [line items]
Inventories	₩ 717,673	₩ 514,145
Merchandise [member]
Disclosure of inventories [line items]
Inventories	672,738	481,056
Others [member]
Disclosure of inventories [line items]
Inventories	44,935	33,089
Gross carrying amount [member]
Disclosure of inventories [line items]
Inventories	813,683	634,449
Gross carrying amount [member] | Merchandise [member]
Disclosure of inventories [line items]
Inventories	768,748	601,360
Gross carrying amount [member] | Others [member]
Disclosure of inventories [line items]
Inventories	44,935	33,089
Valuation allowance [member]
Disclosure of inventories [line items]
Inventories	(96,010)	(120,304)
Valuation allowance [member] | Merchandise [member]
Disclosure of inventories [line items]
Inventories	₩ (96,010)	₩ (120,304)

Inventories - Additional Inform

Inventories - Additional Information (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Classes of current inventories [abstract]
Inventories recognised as expense	₩ 3,485,288	₩ 3,787,203	₩ 3,938,842
Valuation loss and reversal of valuation loss	₩ 24,294	₩ 12,920	₩ 11,214

Other Assets and Liabilities -

Other Assets and Liabilities - Summary of Other Assets and Liabilities (Detail) - KRW (₩) ₩ in Millions		Dec. 31, 2022	Dec. 31, 2021
Other assets
Advance payments		₩ 181,150	₩ 151,266
Prepaid expenses		107,775	100,697
Contract Cost		1,817,678	1,801,244
Contract assets		802,253	745,085
Others		12,964	22,212
Less: Non-current		(820,608)	(776,363)
Current		2,101,212	2,044,323
Other liabilities
Advances received	[1]	387,986	372,375
Withholdings		155,017	135,160
Unearned revenue	[1]	46,493	35,577
Lease liabilities		1,172,038	1,159,369
Contract liabilities		284,107	323,651
Others		33,108	25,757
Less: Non-current		(945,731)	(927,596)
Current		₩ 1,133,018	₩ 1,124,293
[1]The amounts include adjustments arising from adoption of IFRS 15 (Note 26).

Assets Held for Sale - Addition

Assets Held for Sale - Additional Information (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure Of Assets Held For Sale [Line Items]
Proceeds from Assets held for Sale	₩ 4,600	₩ 0	₩ 83,241
GainOn Disposal Of Assets Held For Sale	₩ 3,305
Non-current assets held for sale [member]
Disclosure Of Assets Held For Sale [Line Items]
Impairment loss		11
Proceeds from Assets held for Sale		₩ 1,187

Property and Equipment - Summar

Property and Equipment - Summary of Changes in Property and Equipment (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Disclosure of detailed information about property, plant and equipment [line items]
Beginning, net	₩ 14,464,886	₩ 14,206,119
Acquisition and capital expenditure	3,346,380	3,128,093
Disposal and termination	(92,123)	(140,753)
Depreciation	(2,640,187)	(2,596,140)
Impairment	(16,156)	(2,115)
Transfer in (out)	(62,802)	(83,879)
Transfer from (to) investment properties	(206,183)	(132,944)
Changes in scope of consolidation	(8,587)	111,271
Others	(13,049)	(24,766)
Ending, net	14,772,179	14,464,886
Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning, net	48,995,516	47,586,332
Ending, net	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	(34,530,630)	(33,380,213)
Ending, net	(35,808,009)	(34,530,630)
Land [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning, net	1,315,797	1,334,627
Acquisition and capital expenditure	11,392	60,817
Disposal and termination	(2,556)	(45,318)
Transfer in (out)	24,647	4,608
Transfer from (to) investment properties	(63,278)	(59,848)
Changes in scope of consolidation	0	20,911
Others	(13,194)	0
Ending, net	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	1,315,929	1,334,759
Ending, net	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)
Buildings and structures [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning, net	2,517,422	2,308,022
Acquisition and capital expenditure	32,030	36,446
Disposal and termination	(4,338)	(11,827)
Depreciation	(147,620)	(145,954)
Impairment	0	0
Transfer in (out)	230,955	415,771
Transfer from (to) investment properties	(140,229)	(73,096)
Changes in scope of consolidation	0	6,355
Others	66,341	(18,295)
Ending, net	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	4,707,250	4,402,691
Ending, net	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	(2,189,828)	(2,094,669)
Ending, net	(2,276,292)	(2,189,828)
Machinery and equipment1 [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning, net	9,316,571	9,314,983
Acquisition and capital expenditure	129,754	28,159
Disposal and termination	(76,608)	(76,676)
Depreciation	(2,413,191)	(2,368,679)
Impairment	(6,084)	(2,075)
Transfer in (out)	2,660,753	2,340,948
Changes in scope of consolidation	(4,386)	67,925
Others	7,020	11,986
Ending, net	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	40,270,005	39,182,265
Ending, net	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	(30,953,434)	(29,867,282)
Ending, net	(32,477,744)	(30,953,434)
Others [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning, net	221,238	205,652
Acquisition and capital expenditure	67,921	55,336
Disposal and termination	(4,695)	(6,868)
Depreciation	(79,376)	(81,507)
Impairment	(7,825)	(40)
Transfer in (out)	31,036	27,051
Changes in scope of consolidation	(481)	15,583
Others	(4,382)	6,031
Ending, net	223,436	221,238
Others [member] | Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning, net	1,607,853	1,619,822
Ending, net	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	(1,386,615)	(1,414,170)
Ending, net	(1,053,343)	(1,386,615)
Construction-in-progress [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning, net	1,093,858	1,042,835
Acquisition and capital expenditure	3,105,283	2,947,335
Disposal and termination	(3,926)	(64)
Impairment	(2,247)	0
Transfer in (out)	(3,010,193)	(2,872,257)
Transfer from (to) investment properties	(2,676)
Changes in scope of consolidation	(3,720)	497
Others	(68,834)	(24,488)
Ending, net	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	1,094,479	1,046,795
Ending, net	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	(621)	(3,960)
Ending, net	₩ (498)	₩ (621)

Property and Equipment - Summ_2

Property and Equipment - Summary of the Details of Property and Equipment Provided (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Disclosure of detailed information about property, plant and equipment [line items]
Related amount	₩ 10,006,685	₩ 8,437,703
Land and buildings [member]
Disclosure of detailed information about property, plant and equipment [line items]
Carrying amount	11,353	11,320
Secured amount	₩ 15,774	₩ 15,412
Related line item	Borrowings	Borrowings
Related amount	₩ 3,228	₩ 3,272
Secured party	Industrial Bank of Korea, Korea Development Bank	Industrial Bank of Korea, Korea Development Bank

Property and Equipment - Additi

Property and Equipment - Additional Information (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure of detailed information about property, plant and equipment [line items]
Borrowing cost capitalized	₩ 9,954	₩ 5,360	₩ 8,452
Interest rate of capitalized borrowing cost	3.10%	2.04%	2.36%

Investment Properties - Summary

Investment Properties - Summary of Investment Properties (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Disclosure of detailed information about investment property [line items]
Beginning balance	₩ 1,720,654	₩ 1,368,453
Acquisition	87,398	270,374
Disposal and termination	(20,600)	(21,995)
Depreciation	(47,004)	(47,754)
Transfer from (to) property and equipment	206,183	132,944
Changes in scope of consolidation		7,041
Transfer and others	(13,273)	11,591
Ending balance	1,933,358	1,720,654
Gross carrying amount [member]
Disclosure of detailed information about investment property [line items]
Beginning balance	2,306,198	1,927,776
Ending balance	2,596,204	2,306,198
Accumulated depreciation and amortisation [member]
Disclosure of detailed information about investment property [line items]
Beginning balance	(585,544)	(559,323)
Ending balance	(662,846)	(585,544)
Land [member]
Disclosure of detailed information about investment property [line items]
Beginning balance	813,763	538,335
Acquisition	14,569	171,872
Disposal and termination	(14,725)	(17,133)
Transfer from (to) property and equipment	63,278	59,848
Changes in scope of consolidation		5,262
Transfer and others	2,907	55,579
Ending balance	879,792	813,763
Land [member] | Gross carrying amount [member]
Disclosure of detailed information about investment property [line items]
Beginning balance	815,331	539,903
Ending balance	881,360	815,331
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	840,090	783,571
Acquisition	17,351	42,151
Disposal and termination	(5,858)	(4,862)
Depreciation	(47,004)	(47,754)
Transfer from (to) property and equipment	140,229	73,096
Changes in scope of consolidation		1,779
Transfer and others	(28,350)	(7,891)
Ending balance	916,458	840,090
Buildings [member] | Gross carrying amount [member]
Disclosure of detailed information about investment property [line items]
Beginning balance	1,424,066	1,341,326
Ending balance	1,577,736	1,424,066
Buildings [member] | Accumulated depreciation and amortisation [member]
Disclosure of detailed information about investment property [line items]
Beginning balance	(583,976)	(557,755)
Ending balance	(661,278)	(583,976)
Investment property, construction-in-progress [Member]
Disclosure of detailed information about investment property [line items]
Beginning balance	66,801	46,547
Acquisition	55,478	56,351
Disposal and termination	(17)
Transfer from (to) property and equipment	2,676
Transfer and others	12,170	(36,097)
Ending balance	137,108	66,801
Investment property, construction-in-progress [Member] | Gross carrying amount [member]
Disclosure of detailed information about investment property [line items]
Beginning balance	66,801	46,547
Ending balance	₩ 137,108	₩ 66,801

Investment Properties - Additio

Investment Properties - Additional Information (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Disclosure of detailed information about investment property [line items]
Fair value of investment properties	₩ 5,370,047	₩ 4,263,381
Rental income from investment properties	206,127	₩ 185,877
Future minimum lease fee	191,858
Less than 1 year [member]
Disclosure of detailed information about investment property [line items]
Future minimum lease fee	57,981
1-5 years [member]
Disclosure of detailed information about investment property [line items]
Future minimum lease fee	107,386
More than 5 years [member]
Disclosure of detailed information about investment property [line items]
Future minimum lease fee	₩ 26,491

Investment Properties - Summa_2

Investment Properties - Summary of Investment Properties Provided as Collateral (Detail) - Land and buildings [member] - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Deposits 1 [member]
Disclosure of detailed information about investment property [line items]
Carrying amount	₩ 460,166	₩ 828,103
Secured amount	₩ 61,733	₩ 72,910
Related account	Deposits	Deposits
Related amount	₩ 52,662	₩ 63,012
Borrowings [member]
Disclosure of detailed information about investment property [line items]
Carrying amount	2,546	2,883
Secured amount	₩ 3,326	₩ 3,688
Related account	Borrowings	Borrowings
Related amount	₩ 2,772	₩ 2,728

Intangible Assets - Summary of

Intangible Assets - Summary of Intangible Assets (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure of detailed information about intangible assets [line items]
Beginning, net	₩ 3,447,333	₩ 2,161,258
Acquisition and capital expenditure	346,989	1,720,619
Disposal and termination	(25,668)	(13,783)
Amortization	(627,261)	(604,744)	₩ (628,154)
Impairment	(30,674)	(3,748)
Changes in scope of consolidation	(10,266)	156,253
Others	29,380	31,478
Ending, net	3,129,833	3,447,333	2,161,258
Gross carrying amount [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	7,942,556	7,898,325
Ending, net	8,148,293	7,942,556	7,898,325
Accumulated depreciation and amortisation [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	(4,495,223)	(5,737,067)
Ending, net	(5,018,460)	(4,495,223)	(5,737,067)
Goodwill [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	696,872	230,085
Acquisition and capital expenditure	19,455	467,394
Impairment	(24,006)
Changes in scope of consolidation	0	(607)
Others	15,902	0
Ending, net	708,223	696,872	230,085
Goodwill [member] | Gross carrying amount [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	1,002,530	536,093
Ending, net	1,037,887	1,002,530	536,093
Goodwill [member] | Accumulated depreciation and amortisation [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	(305,658)	(306,008)
Ending, net	(329,664)	(305,658)	(306,008)
Development costs [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	228,373	280,999
Acquisition and capital expenditure	45,997	38,113
Disposal and termination	(5,503)	(7,893)
Amortization	(93,374)	(92,230)
Impairment	(744)	(216)
Changes in scope of consolidation	(2,320)	8,640
Others	(573)	960
Ending, net	171,856	228,373	280,999
Development costs [member] | Gross carrying amount [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	1,812,377	1,767,422
Ending, net	1,803,687	1,812,377	1,767,422
Development costs [member] | Accumulated depreciation and amortisation [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	(1,584,004)	(1,486,423)
Ending, net	(1,631,831)	(1,584,004)	(1,486,423)
Software [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	139,425	146,000
Acquisition and capital expenditure	55,651	36,437
Disposal and termination	(48)	(506)
Amortization	(54,748)	(52,547)
Impairment	(508)	(316)
Changes in scope of consolidation	(802)	(4,548)
Others	16,106	14,905
Ending, net	155,076	139,425	146,000
Software [member] | Gross carrying amount [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	1,083,426	1,053,980
Ending, net	1,156,951	1,083,426	1,053,980
Software [member] | Accumulated depreciation and amortisation [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	(944,001)	(907,980)
Ending, net	(1,001,875)	(944,001)	(907,980)
Frequency usage rights [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	1,839,131	1,160,663
Acquisition and capital expenditure	0	1,065,096
Disposal and termination	0	(276)
Amortization	(350,265)	(386,741)
Impairment	0	0
Others	(610)	389
Ending, net	1,488,256	1,839,131	1,160,663
Frequency usage rights [member] | Gross carrying amount [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	2,617,647	3,373,095
Ending, net	2,617,707	2,617,647	3,373,095
Frequency usage rights [member] | Accumulated depreciation and amortisation [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	(778,516)	(2,212,432)
Ending, net	(1,129,451)	(778,516)	(2,212,432)
Others [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	543,532	343,511
Acquisition and capital expenditure	225,886	113,579
Disposal and termination	(20,117)	(5,108)
Amortization	(128,874)	(73,226)
Impairment	(5,416)	(3,216)
Changes in scope of consolidation	(7,144)	152,768
Others	(1,445)	15,224
Ending, net	606,422	543,532	343,511
Others [member] | Gross carrying amount [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	1,426,576	1,167,735
Ending, net	1,532,061	1,426,576	1,167,735
Others [member] | Accumulated depreciation and amortisation [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	(883,044)	(824,224)
Ending, net	₩ (925,639)	₩ (883,044)	₩ (824,224)

Intangible Assets - Summary o_2

Intangible Assets - Summary of Intangible Assets (Parenthetical) (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2022	Dec. 31, 2021
Statement [Line Items]
Indefinite useful life	₩ 210,114	₩ 219,204

Intangible Assets - Summary o_3

Intangible Assets - Summary of Goodwill Allocated to Each Cash-Generation Unit (Detail) ₩ in Millions	Dec. 31, 2022 KRW (₩)
Disclosure of detailed information about intangible assets [line items]
Goodwill	₩ 708,223
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	50,123
HCN Co Ltd [Member] | Satellite TV [member]
Disclosure of detailed information about intangible assets [line items]
Goodwill	228,674
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	160,033
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	₩ 42,745

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, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure of detailed information about intangible assets [line items]
Goodwill	₩ 708,223
Mobile services [member] | ICT [member]
Disclosure of detailed information about intangible assets [line items]
Terminal growth rate	0%
Discount rate	8.48%
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	1.13%
Mobile services [member] | Top of range [member] | ICT [member]
Disclosure of detailed information about intangible assets [line items]
Expected revenue growth rate	4.31%
Marketing [member] | Mobile services [member]
Disclosure of detailed information about intangible assets [line items]
Terminal growth rate	0%
Expected revenue growth rate	1.13%
Discount rate	8.48%
Impairment loss on goodwill	₩ 0	0	0
Finance [member]
Disclosure of detailed information about intangible assets [line items]
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 1.57% 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 5.32% 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, 2020, 2021 and 2022.
Finance [member] | BC Card Co., Ltd. [member]
Disclosure of detailed information about intangible assets [line items]
Terminal growth rate	0%
Expected revenue growth rate	1.57%
Discount rate	5.32%
Impairment loss on goodwill	₩ 0	0	0
Goodwill	41,234
Others [member] | HCN Co Ltd [Member]
Disclosure of detailed information about intangible assets [line items]
Impairment loss on goodwill	24,006
Goodwill	₩ 228,674
Others [member] | BOOK CLUB MILLIE [Member]
Disclosure of detailed information about intangible assets [line items]
Terminal growth rate	1%
Expected revenue growth rate	27.83%
Discount rate	18.75%
Impairment loss on goodwill	₩ 0
Others [member] | Epsilon Global Communications [Member]
Disclosure of detailed information about intangible assets [line items]
Terminal growth rate	1%
Expected revenue growth rate	12.10%
Discount rate	9.74%
Impairment loss on goodwill	₩ 0
Others [member] | MEDIA GENIE Co Ltd [Member]
Disclosure of detailed information about intangible assets [line items]
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 (-)0.41% 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 15.72% 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, 2022.
Others [member] | KT Telecop Co., Ltd. [member]
Disclosure of detailed information about intangible assets [line items]
Terminal growth rate	1%
Expected revenue growth rate	3.05%
Discount rate	10.23%
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	0.41%
Discount rate	15.72%
Impairment loss on goodwill	₩ 0
Goodwill	₩ 50,214
Others [member] | PlayD Co., Ltd. [Member]
Disclosure of detailed information about intangible assets [line items]
Terminal growth rate	1%
Expected revenue growth rate	9.16%
Discount rate	15.30%
Impairment loss on goodwill	₩ 0
Goodwill	₩ 42,745
Satellite TV [member] | HCN Co Ltd [Member]
Disclosure of detailed information about intangible assets [line items]
Terminal growth rate	0%
Expected revenue growth rate	6.60%
Discount rate	10.14%

Investments in Associates and_3

Investments in Associates and Joint Ventures - Summary of Details of Associates (Detail)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
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%
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%
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%	28.60%
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%	35.30%
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, 2022	Dec. 31, 2021
Disclosure Of Associates And Joint Ventures [Line Items]
Beginning	₩ 1,288,429	₩ 557,881
Acquisition (Disposal)	255,041	476,948
Share of net profit (loss) from associates and joint ventures	(16,821)	116,174
Others	(45,927)	137,426
Ending	1,480,722	1,288,429
Hyundai Robotics Co., Ltd. [member]
Disclosure Of Associates And Joint Ventures [Line Items]
Beginning	48,725	50,936
Share of net profit (loss) from associates and joint ventures	798	(2,373)
Others	(151)	162
Ending	49,372	48,725
KT-IBKC future investment fund [member]
Disclosure Of Associates And Joint Ventures [Line Items]
Beginning	12,081	16,190
Acquisition (Disposal)		(5,700)
Share of net profit (loss) from associates and joint ventures		1,591
Ending		12,081
K Bank [member]
Disclosure Of Associates And Joint Ventures [Line Items]
Beginning	831,737	208,272
Acquisition (Disposal)		424,957
Share of net profit (loss) from associates and joint ventures	29,010	5,809
Others	(7,991)	192,699
Ending	852,756	831,737
K-Realty CR-REITs No.1 [member]
Disclosure Of Associates And Joint Ventures [Line Items]
Beginning	67,658	31,088
Share of net profit (loss) from associates and joint ventures		75,676
Others		(39,106)
Ending		67,658
Others [member]
Disclosure Of Associates And Joint Ventures [Line Items]
Beginning	149,293	81,240
Acquisition (Disposal)		57,691
Share of net profit (loss) from associates and joint ventures		18,769
Others		(8,407)
Ending		149,293
Other associates and joint ventures [member]
Disclosure Of Associates And Joint Ventures [Line Items]
Beginning	189,810
Acquisition (Disposal)	100,040
Share of net profit (loss) from associates and joint ventures	(24,688)
Others	(56,078)
Ending	209,084	189,810
KIF Investment Fund [Member]
Disclosure Of Associates And Joint Ventures [Line Items]
Beginning	178,935	170,155
Share of net profit (loss) from associates and joint ventures	2,502	16,702
Others	(10,458)	(7,922)
Ending	170,979	178,935
Megazone Cloud Corporation [Member]
Disclosure Of Associates And Joint Ventures [Line Items]
Acquisition (Disposal)	130,001
Share of net profit (loss) from associates and joint ventures	(22,555)
Others	28,753
Ending	136,199
IGIS No. 4681 General Private Real Estate Investment Company [Member]
Disclosure Of Associates And Joint Ventures [Line Items]
Acquisition (Disposal)	25,000
Share of net profit (loss) from associates and joint ventures	(1,411)
Ending	23,589
KT-DSC creative economy youth start-up investment fund [member]
Disclosure Of Associates And Joint Ventures [Line Items]
Beginning	22,138
Share of net profit (loss) from associates and joint ventures	(13)
Others	(2)
Ending	22,123	22,138
IGIS Professional Investors Private Investment Real Estate Investment LLC No.395 [Member]
Disclosure Of Associates And Joint Ventures [Line Items]
Beginning	17,084
Share of net profit (loss) from associates and joint ventures	(464)
Ending	₩ 16,620	₩ 17,084

Investments in Associates and_5

Investments in Associates and Joint Ventures - Summary of Changes in Investments in Associates and Joint Ventures (Parenthetical) (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure Of Associates And Joint Ventures [Line Items]
Share gain from associates and joint ventures	₩ (17,285)	₩ 116,061	₩ 18,041
KT Investment Co., Ltd. [member]
Disclosure Of Associates And Joint Ventures [Line Items]
Share gain from associates and joint ventures	₩ 464	₩ 113	₩ 279

Investments in Associates and_6

Investments in Associates and Joint Ventures - Summary of Financial Information of Associates and Joint Ventures (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure Of Associates And Joint Ventures [Line Items]
Current assets	₩ 12,690,014	₩ 11,858,350
Non-current assets	28,299,796	25,300,991
Current liabilities	10,699,268	10,072,432
Non-current liabilities	11,877,846	10,519,748
Operating revenue	25,638,855	24,898,005	₩ 24,099,394
Profit (loss) for the year	1,385,635	1,459,395	746,256
Other comprehensive income(loss)	(2,194)	165,567	23,255
Total comprehensive income(loss)	1,383,441	1,624,962	₩ 769,511
KT-IBKC future investment fund [member]
Disclosure Of Associates And Joint Ventures [Line Items]
Current assets		24,163
Operating revenue		5,912
Profit (loss) for the year		3,184
Total comprehensive income(loss)		3,184
K Bank Inc.[Member]
Disclosure Of Associates And Joint Ventures [Line Items]
Current assets	16,562,742	13,263,658
Non-current assets	71,265	70,362
Current liabilities	14,830,983	11,594,316
Non-current liabilities	2,168	2,467
Operating revenue	558,872	287,775
Profit (loss) for the year	86,498	21,728
Other comprehensive income(loss)	(24,888)	(28,211)
Total comprehensive income(loss)	61,610	(6,483)
Hyundai Robotics Co., Ltd. [member]
Disclosure Of Associates And Joint Ventures [Line Items]
Current assets	278,413	308,776
Non-current assets	135,380	120,221
Current liabilities	63,009	91,637
Non-current liabilities	64,335	57,899
Operating revenue	181,944	189,255
Profit (loss) for the year	9,332	(23,730)
Other comprehensive income(loss)	(49)	1,977
Total comprehensive income(loss)	9,283	(21,753)
K-Realty CR-REITs No.1 [member]
Disclosure Of Associates And Joint Ventures [Line Items]
Current assets		208,825
Operating revenue		425,363
Profit (loss) for the year		180,437
Total comprehensive income(loss)		180,437
Dividends received from associates		40,142
KIF Investment Fund [Member]
Disclosure Of Associates And Joint Ventures [Line Items]
Current assets	98,132	117,172
Non-current assets	414,804	419,632
Operating revenue	19,916	58,791
Profit (loss) for the year	7,505	50,107
Other comprehensive income(loss)	(11,779)	(6,847)
Total comprehensive income(loss)	(4,274)	43,260
Dividends received from associates	6,531	₩ 5,640
Megazone Cloud Corporation [Member]
Disclosure Of Associates And Joint Ventures [Line Items]
Current assets	857,089
Non-current assets	202,767
Current liabilities	330,619
Non-current liabilities	94,202
Operating revenue	1,261,228
Profit (loss) for the year	(293,186)
Other comprehensive income(loss)	(6,609)
Total comprehensive income(loss)	(299,795)
IGIS No. 4681 General Private Real Estate Investment Company [Member]
Disclosure Of Associates And Joint Ventures [Line Items]
Current assets	52,851
Current liabilities	12
Operating revenue	9
Profit (loss) for the year	(3,161)
Total comprehensive income(loss)	(3,161)
KT-DSC creative economy youth start-up investment fund [member]
Disclosure Of Associates And Joint Ventures [Line Items]
Current assets	908
Non-current assets	76,884
Current liabilities	362
Operating revenue	19,931
Profit (loss) for the year	(53)
Total comprehensive income(loss)	(53)
IGIS Professional Investors Private Investment Real Estate Investment LLC No.395 [Member]
Disclosure Of Associates And Joint Ventures [Line Items]
Current assets	9,344
Non-current assets	127,321
Current liabilities	90,545
Profit (loss) for the year	(474)
Total comprehensive income(loss)	₩ (474)

Investments in Associates and_7

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, 2022	Dec. 31, 2021
Disclosure Of Associates And Joint Ventures [Line Items]
Book amount	₩ 1,480,722	₩ 1,288,429
K Bank [member]
Disclosure Of Associates And Joint Ventures [Line Items]
Net assets	₩ 1,800,856	₩ 1,737,237
Percentage of ownership	33.72%	33.72%
Share in net assets	₩ 607,276	₩ 585,837
Intercompany transaction and others	245,480	245,900
Book amount	852,756	831,737
KT-IBKC future investment fund [member]
Disclosure Of Associates And Joint Ventures [Line Items]
Net assets		₩ 24,163
Percentage of ownership		50%
Share in net assets		₩ 12,081
Book amount		12,081
Hyundai Robotics Co., Ltd. [member]
Disclosure Of Associates And Joint Ventures [Line Items]
Net assets	₩ 286,449	₩ 279,461
Percentage of ownership	10%	10%
Share in net assets	₩ 28,645	₩ 27,946
Intercompany transaction and others	20,727	20,779
Book amount	49,372	48,725
K-Realty CR-REITs No.1 [member]
Disclosure Of Associates And Joint Ventures [Line Items]
Net assets		₩ 208,825
Percentage of ownership		30.05%
Share in net assets		₩ 62,752
Intercompany transaction and others		4,906
Book amount		67,658
KIF Investment Fund [Member]
Disclosure Of Associates And Joint Ventures [Line Items]
Net assets	₩ 512,936	₩ 536,804
Percentage of ownership	33.33%	33.33%
Share in net assets	₩ 170,979	₩ 178,935
Book amount	170,979	₩ 178,935
Megazone Cloud Corporation [Member]
Disclosure Of Associates And Joint Ventures [Line Items]
Net assets	₩ 635,035
Percentage of ownership	6.83%
Share in net assets	₩ 43,360
Intercompany transaction and others	92,839
Book amount	136,199
IGIS No. 4681 General Private Real Estate Investment Company [Member]
Disclosure Of Associates And Joint Ventures [Line Items]
Net assets	₩ 52,839
Percentage of ownership	44.64%
Share in net assets	₩ 23,589
Book amount	23,589
KT-DSC creative economy youth start-up investment fund [member]
Disclosure Of Associates And Joint Ventures [Line Items]
Net assets	₩ 77,430
Percentage of ownership	28.57%	28.60%
Share in net assets	₩ 22,123
Book amount	22,123
IGIS Professional Investors Private Investment Real Estate Investment LLC No.395 [Member]
Disclosure Of Associates And Joint Ventures [Line Items]
Net assets	₩ 46,120
Percentage of ownership	35.29%	35.30%
Share in net assets	₩ 16,278
Intercompany transaction and others	342
Book amount	₩ 16,620

Investments in Associates and_8

Investments in Associates and Joint Ventures - Additional Information (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Disclosure of associates [abstract]
Loss from associates and joint ventures not recognized	₩ 909	₩ 717
Accumulated comprehensive loss of associates and joint ventures not recognized	₩ 9,915	₩ 9,006

Trade and Other Payables - Summ

Trade and Other Payables - Summary of Trade and Other Payables (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2022	Dec. 31, 2021
Current liabilities
Trade payables	₩ 1,150,515	₩ 1,537,148
Other payables	6,182,650	5,104,274
Total	7,333,165	6,641,422
Non-current liabilities
Other payables	1,064,099	1,338,781
Total	₩ 1,064,099	₩ 1,338,781

Trade and Other Payables - Su_2

Trade and Other Payables - Summary of Other Payables (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2022	Dec. 31, 2021
Trade and other payables [abstract]
Non-trade payables	₩ 4,981,300	₩ 4,378,445
Accrued expenses	1,234,023	1,037,616
Operating deposits	818,603	814,613
Others	212,823	212,381
Less: non-current	(1,064,099)	(1,338,781)
Current	₩ 6,182,650	₩ 5,104,274

Trade and Other Payables - Su_3

Trade and Other Payables - Summary of Other Payables (Parenthetical) (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Trade and other payables [abstract]
Settlement payables related to credit card transaction	₩ 1,754,075	₩ 1,086,996

Borrowings - Summary of Borrowi

Borrowings - Summary of Borrowings (Detail) ₩ in Millions, ¥ in Millions, $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2022 KRW (₩)	Dec. 31, 2022 USD ($)	Dec. 31, 2022 JPY (¥)	Dec. 31, 2022 SGD ($)	Dec. 31, 2021 KRW (₩)	Dec. 31, 2021 USD ($)	Dec. 31, 2021 JPY (¥)	Dec. 31, 2021 SGD ($)
Disclosure of detailed information about borrowings [line items]
Annual interest rates	0%	0%	0%	0%
Less: Current portion	₩ (1,827,042)				₩ (1,731,422)
Borrowings	10,006,685				8,437,703
Gross carrying amount [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	₩ 10,033,053
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%	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%	2.50%
Gross carrying amount [member] | Aug 07, 2022 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Aug. 7, 2022
Gross carrying amount [member] | Aug 23, 2023 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Aug. 23, 2023
Annual interest rates description	LIBOR(3M)+0.900
Annual interest rates adjustment rate	0.90%	0.90%	0.90%	0.90%
Gross carrying amount [member] | July 19, 2022 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jul. 19, 2022
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%	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%	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	LIBOR(3M)+0.980
Annual interest rates adjustment rate	0.98%	0.98%	0.98%	0.98%
Gross carrying amount [member] | Jun. 19. 2023 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jun. 19, 2023
Annual interest rates description	SOR(6M)+0.500
Annual interest rates adjustment rate	0.50%	0.50%	0.50%	0.50%
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%	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%	4.27%
Gross carrying amount [member] | Apr. 10, 2023 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Apr. 10, 2023
Annual interest rates	2.95%	2.95%	2.95%	2.95%
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%	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%	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%	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%	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%	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%	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%	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%	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%	2.351%
Gross carrying amount [member] | Jan. 30, 2023 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jan. 30, 2023
Annual interest rates	2.749%	2.749%	2.749%	2.749%
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%	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%	2.931%
Gross carrying amount [member] | Oct, 11, 2022 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Oct. 11, 2022
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%	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%	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%	1.674%
Gross carrying amount [member] | June 16, 2023 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jun. 16, 2023
Annual interest rates	1.174%	1.174%	1.174%	1.174%
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%	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%	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%	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%	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%	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%	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%	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%	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%	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%	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%	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%	2.224%
Gross carrying amount [member] | Jun. 23. 2023 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jun. 23, 2023
Annual interest rates	1.513%	1.513%	1.513%	1.513%
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%	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%	1.756%
Gross carrying amount [member] | Apr. 07. 2023 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Apr. 7, 2023
Annual interest rates	1.154%	1.154%	1.154%	1.154%
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%	1.462%
Gross carrying amount [member] | May 12. 2023 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	May 12, 2023
Annual interest rates	1.191%	1.191%	1.191%	1.191%
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%	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%	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%	1.982%
Gross carrying amount [member] | Nov. 10. 2023 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Nov. 10, 2023
Annual interest rates	2.31%	2.31%	2.31%	2.31%
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%	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%	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%	4%
Gross carrying amount [member] | Jan. 14. 2022 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jan. 14, 2022
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%	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%	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%	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%	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%	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%	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%	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%	4.188%
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%	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%	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%	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%	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%	0.965%
Gross carrying amount [member] | Apr. 28. 2023 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Apr. 28, 2023
Annual interest rates	2.588%	2.588%	2.588%	2.588%
Gross carrying amount [member] | oct. 27. 2023 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Oct. 27, 2023
Annual interest rates	3.024%	3.024%	3.024%	3.024%
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%	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%	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%	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%	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%	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%	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%	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%	5.557%
Gross carrying amount [member] | Jun. 25. 2025 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jun. 20, 2025
Annual interest rates	5.594%	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%	5.615%
Gross carrying amount [member] | Dec. 27. 2023 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Dec. 27, 2023
Annual interest rates	5.066%	5.066%	5.066%	5.066%
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%	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%	5.08%
Debentures [member]
Disclosure of detailed information about borrowings [line items]
Less: Current portion	₩ (1,154,101)				(1,337,714)
Discount on bonds	(23,728)				(22,093)
Borrowings	7,228,522				6,198,648
Debentures [member] | Gross carrying amount [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	8,406,351				7,558,455
Debentures [member] | Gross carrying amount [member] | Sept. 07, 2034 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	126,730	$ 100,000			118,550	$ 100,000
Debentures [member] | Gross carrying amount [member] | July 18, 2026 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	506,920	400,000			474,200	400,000
Debentures [member] | Gross carrying amount [member] | Aug 07, 2022 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings					474,200	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			118,550	100,000
Debentures [member] | Gross carrying amount [member] | July 19, 2022 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings					304,951		¥ 29,600,000
Debentures [member] | Gross carrying amount [member] | July 19, 2024 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	3,813		¥ 400,000		4,121		¥ 400,000
Debentures [member] | Gross carrying amount [member] | Sept. 1, 2025 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	506,920	400,000			474,200	400,000
Debentures [member] | Gross carrying amount [member] | Nov 01, 2024 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	443,555	350,000			414,925	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	249,108			$ 284,000
Debentures [member] | Gross carrying amount [member] | Jan, 21, 2027 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	380,190	300,000			355,650	$ 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				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				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, 2022 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings					340,000
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				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				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				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				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				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	633,650	$ 500,000
Debentures [member] | Gross carrying amount [member] | Jan. 14. 2022 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings					220,000
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
Debentures [member] | Gross carrying amount [member] | Jan. 27. 2027 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	100,000
Debentures [member] | Gross carrying amount [member] | Jan. 27. 2032 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	30,000
Debentures [member] | Gross carrying amount [member] | Jun. 27. 2025 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	280,000
Debentures [member] | Gross carrying amount [member] | Jun. 29. 2027 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	120,000
Debentures [member] | Gross carrying amount [member] | Feb. 29. 2024 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	50,000
Debentures [member] | Gross carrying amount [member] | Sep. 2. 2024 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	20,000
Debentures [member] | Gross carrying amount [member] | Feb. 28. 2025 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	20,000
Debentures [member] | Gross carrying amount [member] | Mar. 25. 2025 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	60,000
Debentures [member] | Gross carrying amount [member] | Mar. 25. 2032 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	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
Debentures [member] | Gross carrying amount [member] | Aug. 09. 2024 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	30,000
Debentures [member] | Gross carrying amount [member] | Aug. 11. 2027 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	30,000
Debentures [member] | Gross carrying amount [member] | Jun.14. 2024 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	20,000
Debentures [member] | Gross carrying amount [member] | Dec. 13. 2024 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	20,000
Debentures [member] | Gross carrying amount [member] | Dec. 12. 2025 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	30,000
Debentures [member] | Gross carrying amount [member] | Jun. 21. 2024 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	10,000
Debentures [member] | Gross carrying amount [member] | Dec. 20. 2024 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	20,000
Debentures [member] | Gross carrying amount [member] | Jun. 25. 2025 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	30,000
Debentures [member] | Gross carrying amount [member] | Dec. 22. 2025 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	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
Debentures [member] | Gross carrying amount [member] | Apr. 26. 2024 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	₩ 10,000

Borrowings - Summary of Borro_2

Borrowings - Summary of Borrowings (Parenthetical) (Detail)	Dec. 31, 2022
Disclosure of detailed information about borrowings [line items]
Libor rate	4.767%
SOR rate	4.429%
The 1561st Won Denominated Unsecured Bond March Twenty Five Twenty Twenty Five [member]
Disclosure of detailed information about borrowings [line items]
CMS rate	3.588%
The 1562nd Won Denominated Unsecured Bond March Twenty Five Twenty Thirty Two [member]
Disclosure of detailed information about borrowings [line items]
CMS rate	3.49%

Borrowings - Summary of Korean

Borrowings - Summary of Korean Won and Foreign Currency Borrowings (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Disclosure of detailed information about borrowings [line items]
Annual interest rates	0%
Borrowings	₩ 10,006,685	₩ 8,437,703
Redemption premium	4,565	2,267
Bond discount issuance	(7,206)	(3,825)
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	₩ 35,359	6,442
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]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	0%
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
Annual interest rates	4%
Borrowings	₩ 30,000

Borrowings - Summary of Korea_2

Borrowings - Summary of Korean Won and Foreign Currency Borrowings (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2022
Disclosure of detailed information about borrowings [line items]
Interest rate	0%
Maturity yield	5%
The First Unsecured Cb January Five Twenty Twenty Five [Member]
Disclosure of detailed information about borrowings [line items]
Interest rate	0%
Maturity yield	3%
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)

Borrowings - Summary of Short-t

Borrowings - Summary of Short-term Borrowing (Detail) ₩ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2022 KRW (₩)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 KRW (₩)	Dec. 31, 2021 USD ($)
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	₩ 504,998		₩ 338,927
Short-term borrowings [member] | NongHyup Bank [member]
Disclosure of detailed information about borrowings [line items]
Short-term borrowings	₩ 9,000
Annual interest rates description	COFIX(6M)+1.780
Short-term borrowings [member] | NongHyup Bank [member] | Bottom of range [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	4.69%	4.69%
Short-term borrowings [member] | NongHyup Bank [member] | Top of range [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	4.94%	4.94%
Short-term borrowings [member] | Shinhan Bank [member]
Disclosure of detailed information about borrowings [line items]
Short-term borrowings	₩ 105,000		4,500
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	6.44%	6.44%
Short-term borrowings [member] | Shinhan Bank 1 [Member]
Disclosure of detailed information about borrowings [line items]
Short-term borrowings	₩ 30,000
Annual interest rates description	CD(91D)+1.750
Short-term borrowings [member] | Korea Development Bank [member]
Disclosure of detailed information about borrowings [line items]
Short-term borrowings	₩ 27,201		16,000
Short-term borrowings [member] | Korea Development Bank [member] | Bottom of range [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	4.63%	4.63%
Short-term borrowings [member] | Korea Development Bank [member] | Top of range [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	6.20%	6.20%
Short-term borrowings [member] | Woori Bank [Member]
Disclosure of detailed information about borrowings [line items]
Short-term borrowings	₩ 20,000		20,000
Annual interest rates description	KORIBOR(3M)+1.960
Short-term borrowings [member] | Industrial Bank Of Korea [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	4.88%	4.88%
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	₩ 5,000		5,000
Annual interest rates description	CD(91D)-0.020
Short-term borrowings [member] | KB SECURITIES [Member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	5.904%	5.904%
Short-term borrowings	₩ 94,822		71,000
Short-term borrowings [member] | Shinhan Investment [Member]
Disclosure of detailed information about borrowings [line items]
Short-term borrowings			73,000
Short-term borrowings [member] | KIWOOM Securities [Member]
Disclosure of detailed information about borrowings [line items]
Short-term borrowings			63,000
Short-term borrowings [member] | NH INVESTMENT SECURITIES [Member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	5.07%	5.07%
Short-term borrowings	₩ 20,000		53,000
Short-term borrowings [member] | Korea Investment Securities [Member]
Disclosure of detailed information about borrowings [line items]
Short-term borrowings			10,000
Short-term borrowings [member] | HSBC [Member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	5.09%	5.09%
Short-term borrowings	₩ 23,451	$ 18,500	₩ 17,427	$ 14,700
Short-term borrowings [member] | IBK Securities [Member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	5.07%	5.07%
Short-term borrowings	₩ 20,000
Short-term borrowings [member] | Hi Investment Securities and Others [Member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	3.71%	3.71%
Short-term borrowings	₩ 99,524
Short-term borrowings [member] | Woori Bank One [Member]
Disclosure of detailed information about borrowings [line items]
Short-term borrowings	₩ 30,000
Annual interest rates description	CD(91D)+1.430
Short-term borrowings [member] | Nong Hyup Bank One [Member]
Disclosure of detailed information about borrowings [line items]
Short-term borrowings	₩ 15,000

Borrowings - Summary of Short_2

Borrowings - Summary of Short-term Borrowing (Parenthetical) (Detail)	Dec. 31, 2022
Woori Bank [Member]
Disclosure of detailed information about borrowings [line items]
LIBOR rate	4.04%
NongHyup Bank [Member]
Disclosure of detailed information about borrowings [line items]
LIBOR rate	4.34%
Hana Bank [Member]
Disclosure of detailed information about borrowings [line items]
LIBOR rate	3.98%

Borrowings - Summary of Long-te

Borrowings - Summary of Long-term Borrowings (Detail) € in Thousands, $ in Thousands, ₩ in Millions	12 Months Ended
	Dec. 31, 2022 KRW (₩)	Dec. 31, 2022 USD ($)	Dec. 31, 2022 EUR (€)	Dec. 31, 2021 KRW (₩)	Dec. 31, 2021 USD ($)	Dec. 31, 2021 EUR (€)
Disclosure of detailed information about borrowings [line items]
Annual interest rates	0%	0%	0%
Borrowings	₩ 10,006,685			₩ 8,437,703
Total	8,179,643			6,706,281
Long-term borrowings [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	1,083,705			552,995
Less: Current portion	(167,943)			(51,803)
Total	₩ 915,762			501,192
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	₩ 1,974			2,467
Long-term borrowings [member] | Shinhan Bank [member] | General loans [member]
Disclosure of detailed information about borrowings [line items]
Borrowings				30,726	$ 25,918
Long-term borrowings [member] | Shinhan Bank [member] | General Loans 1 [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates description	LIBOR(3M)+1.650
Borrowings	₩ 11,292	$ 8,910		10,563	8,910
Long-term borrowings [member] | Shinhan Bank [member] | General Loans 2 [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates description	LIBOR(3M)+1.847
Borrowings	₩ 16,475	13,000		15,412	13,000
Long-term borrowings [member] | Shinhan Bank [member] | General Loans 3 [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates description	LIBOR(3M)+2.130
Borrowings	₩ 31,683	25,000		29,638	25,000
Long-term borrowings [member] | Shinhan Bank [member] | General Loans 4 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	₩ 39,855	$ 31,472		37,345	31,472
Long-term borrowings [member] | Shinhan Bank [member] | General Loans 4 [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 4 [member] | Top of range [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	3.23%	3.23%	3.23%
Long-term borrowings [member] | Shinhan Bank [member] | General Loans 5 [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	4.49%	4.49%	4.49%
Borrowings	₩ 62,398
Long-term borrowings [member] | Shinhan Bank [member] | General Loans 6 [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates description	SOFR(3M)+1.300
Borrowings	₩ 26,774	$ 21,127
Long-term borrowings [member] | CA-CIB [member] | Long-term CP [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	₩ 200,000			100,000
Long-term borrowings [member] | CA-CIB [member] | Long-term CP [member] | Bottom of range [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	1.26%	1.26%	1.26%
Long-term borrowings [member] | CA-CIB [member] | Long-term CP [member] | Top of range [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	3.38%	3.38%	3.38%
Long-term borrowings [member] | Korea Development Bank [member] | General loans [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	₩ 38,000			39,000
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	3.61%	3.61%	3.61%
Long-term borrowings [member] | Woori Bank [Member] | General loans [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates description	EURIBOR(3M)+0.900
Borrowings	₩ 10,404		€ 7,700	10,336		€ 7,700
Long-term borrowings [member] | Woori Bank [Member] | General Loans 1 [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	3.32%	3.32%	3.32%
Borrowings	₩ 15,000			15,000
Long-term borrowings [member] | Woori Bank [Member] | PF Loans [Member]
Disclosure of detailed information about borrowings [line items]
Borrowings	₩ 40,682			23,614
Long-term borrowings [member] | Woori Bank [Member] | PF Loans [Member] | Bottom of range [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	2%	2%	2%
Long-term borrowings [member] | Woori Bank [Member] | PF Loans [Member] | Top of range [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	3.47%	3.47%	3.47%
Long-term borrowings [member] | Kyobo Life Insurance [Member] | PF Loans [Member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates description	CD(91D)+1.150%~3.450
Borrowings	₩ 66,390			41,640
Long-term borrowings [member] | Samsung Life Insurance [Member] | PF Loans [Member]
Disclosure of detailed information about borrowings [line items]
Borrowings	₩ 36,883			23,133
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] | Kookmin Bank and others [member] | Facility loans [member]
Disclosure of detailed information about borrowings [line items]
Borrowings				11,584	$ 9,771
Long-term borrowings [member] | JPM [Member] | Long-term CP [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	2.70%	2.70%	2.70%
Borrowings	₩ 100,000
Long-term borrowings [member] | DBS [Member] | Long-term CP [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	4.109%	4.109%	4.109%
Borrowings	₩ 100,000
Long-term borrowings [member] | Hi Investment Securities and Others [Member] | CP [Member]
Disclosure of detailed information about borrowings [line items]
Borrowings	₩ 182,569			88,510
Long-term borrowings [member] | Hi Investment Securities and Others [Member] | CP [Member] | Bottom of range [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	2.302%	2.302%	2.302%
Long-term borrowings [member] | Hi Investment Securities and Others [Member] | CP [Member] | Top of range [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	3.622%	3.622%	3.622%
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	₩ 59,066			46,267
Long-term borrowings [member] | Standard Chartered Bank Korea [Member] | PF Loans [Member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates description	CD(91D)+1.150%~3.450
Borrowings	₩ 44,260			₩ 27,760

Borrowings - Summary of Long-_2

Borrowings - Summary of Long-term Borrowings (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2022
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.
Shinhan Bank [member]
Disclosure of detailed information about borrowings [line items]
LIBOR rate	4.587%
Woori Bank [Member]
Disclosure of detailed information about borrowings [line items]
LIBOR rate	4.04%
NH Jayang [Member]
Disclosure of detailed information about borrowings [line items]
LIBOR rate	3.98%
Vessel facility loans [member] | Kookmin Bank [member]
Disclosure of detailed information about borrowings [line items]
LIBOR rate	4.767%
Vessel facility loans [member] | Woori Bank [Member]
Disclosure of detailed information about borrowings [line items]
LIBOR rate	2.132%

Borrowings - Summary of Repayme

Borrowings - Summary of Repayment of Debentures and Borrowings Including the Current Liabilities (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2022	Dec. 31, 2021
Disclosure of detailed information about borrowings [line items]
Borrowings	₩ 10,006,685	₩ 8,437,703
Long-term borrowings [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	1,083,705	₩ 552,995
Gross carrying amount [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	10,033,053
Gross carrying amount [member] | Bonds [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	8,444,351
Gross carrying amount [member] | Bonds [member] | In local currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	5,448,000
Gross carrying amount [member] | Bonds [member] | In foreign currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	2,996,351
Gross carrying amount [member] | Long-term borrowings [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	1,588,702
Gross carrying amount [member] | Long-term borrowings [member] | In local currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	1,428,769
Gross carrying amount [member] | Long-term borrowings [member] | In foreign currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	159,933
Gross carrying amount [member] | Jan 1, 2023 - Dec 31, 2023 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	1,827,513
Gross carrying amount [member] | Jan 1, 2023 - Dec 31, 2023 [member] | Bonds [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	1,154,573
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	760,000
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	394,573
Gross carrying amount [member] | Jan 1, 2023 - Dec 31, 2023 [member] | Long-term borrowings [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	672,940
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	590,040
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	82,900
Gross carrying amount [member] | Jan 1, 2024 - Dec 31, 2024 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	2,334,954
Gross carrying amount [member] | Jan 1, 2024 - Dec 31, 2024 [member] | Bonds [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	1,827,368
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	1,380,000
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	447,368
Gross carrying amount [member] | Jan 1, 2024 - Dec 31, 2024 [member] | Long-term borrowings [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	507,586
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	455,899
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	51,687
Gross carrying amount [member] | Jan 1, 2025 - Dec 31, 2025 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	2,461,002
Gross carrying amount [member] | Jan 1, 2025 - Dec 31, 2025 [member] | Bonds [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	2,278,570
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	1,138,000
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	1,140,570
Gross carrying amount [member] | Jan 1, 2025 - Dec 31, 2025 [member] | Long-term borrowings [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	182,432
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	182,432
Gross carrying amount [member] | Jan 1, 2026 - Dec 31, 2026 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	1,038,737
Gross carrying amount [member] | Jan 1, 2026 - Dec 31, 2026 [member] | Bonds [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	926,920
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	420,000
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	506,920
Gross carrying amount [member] | Jan 1, 2026 - Dec 31, 2026 [member] | Long-term borrowings [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	111,817
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	111,817
Gross carrying amount [member] | After 2027 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	2,370,847
Gross carrying amount [member] | After 2027 [member] | Bonds [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	2,256,920
Gross carrying amount [member] | After 2027 [member] | Bonds [member] | In local currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	1,750,000
Gross carrying amount [member] | After 2027 [member] | Bonds [member] | In foreign currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	506,920
Gross carrying amount [member] | After 2027 [member] | Long-term borrowings [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	113,927
Gross carrying amount [member] | After 2027 [member] | Long-term borrowings [member] | In local currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	88,581
Gross carrying amount [member] | After 2027 [member] | Long-term borrowings [member] | In foreign currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	₩ 25,346

Provisions - Summary of Changes

Provisions - Summary of Changes in Provisions (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Disclosure of other provisions [line items]
Beginning balance	₩ 257,397	₩ 252,192
Increase (Transfer)	24,879	32,895
Usage	(30,081)	(7,301)
Reversal	(51,789)	(22,897)
Scope change		2,314
Others	(40)	194
Ending balance	200,366	257,397
Current	109,133	171,316
Non-current	91,233	86,081
Litigation [member]
Disclosure of other provisions [line items]
Beginning balance	80,165	76,500
Increase (Transfer)	6,005	6,288
Usage	(6,155)	(2,599)
Reversal	(43,686)	(24)
Ending balance	36,329	80,165
Current	34,730	79,947
Non-current	1,599	218
Restoration cost [member]
Disclosure of other provisions [line items]
Beginning balance	107,358	105,767
Increase (Transfer)	13,027	6,772
Usage	(8,143)	(2,776)
Reversal	(3,685)	(3,685)
Scope change		1,086
Others	405	194
Ending balance	108,962	107,358
Current	19,918	26,026
Non-current	89,044	81,332
Others [member]
Disclosure of other provisions [line items]
Beginning balance	69,874	69,925
Increase (Transfer)	5,847	19,835
Usage	(15,783)	(1,926)
Reversal	(4,418)	(19,188)
Scope change		1,228
Others	(445)
Ending balance	55,075	69,874
Current	54,485	65,343
Non-current	₩ 590	₩ 4,531

Net Defined Benefit Liabiliti_3

Net Defined Benefit Liabilities - Summary of Amount Recognized in the Statements of Financial Position (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2022	Dec. 31, 2021
Disclosure of net defined benefit liability (asset) [abstract]
Present value of defined benefit obligations	₩ 2,218,655	₩ 2,494,930
Fair value of plan assets	(2,478,143)	(2,314,632)
Liabilities	51,654	197,883
Assets	₩ 311,142	₩ 17,585

Net Defined Benefit Liabiliti_4

Net Defined Benefit Liabilities - Summary of Changes in the Defined Benefit Obligations (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure of net defined benefit liability (asset) [Line Items]
Current service cost	₩ (238,068)	₩ (249,125)	₩ (248,047)
Interest expense	3,139	5,047	6,494
Present value of defined benefit obligation [member]
Disclosure of net defined benefit liability (asset) [Line Items]
Beginning balance	2,494,930	2,556,712
Current service cost	238,068	249,125
Interest expense	59,041	44,905
Benefit paid	(316,047)	(310,766)
Changes due to settlements of plan & Past Service Cost	(701)	(681)
Remeasurements:
Actuarial gains and losses arising from changes in demographic assumptions	(13,048)	(8,375)
Actuarial gains and losses arising from changes in financial assumptions	(323,501)	(61,002)
Actuarial gains and losses arising from experience adjustments	80,845	(5,271)
Changes in scope of consolidation, etc.	(932)	30,283
Ending balance	₩ 2,218,655	₩ 2,494,930	₩ 2,556,712

Net Defined Benefit Liabiliti_5

Net Defined Benefit Liabilities - Summary of Changes in the Fair Value of Plan Assets (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure of net defined benefit liability (asset) [Line Items]
Interest income	₩ 3,139	₩ 5,047	₩ 6,494
Plan assets [member]
Disclosure of net defined benefit liability (asset) [Line Items]
Beginning	2,314,632	2,189,375
Interest income	55,902	39,858
Remeasurements:
Return on plan assets (excluding amounts included in interest income)	(8,542)	(130)
Benefits paid	(287,419)	(271,506)
Employer contributions	401,358	325,818
Changes in scope of consolidation, etc.	2,212	31,217
Ending	₩ 2,478,143	₩ 2,314,632	₩ 2,189,375

Net Defined Benefit Liabiliti_6

Net Defined Benefit Liabilities - Summary of Amounts Recognized in the Consolidated Statements of Operations (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Changes in net defined benefit liability (asset) [abstract]
Current service cost	₩ 238,068	₩ 249,125	₩ 248,047
Net Interest cost	3,139	5,047	6,494
Changes due to settlements of plan & Past Service Cost	(701)	(681)	1,075
Transfer out	(15,102)	(16,660)	(16,514)
Total expenses	₩ 225,404	₩ 236,831	₩ 239,102

Net Defined Benefit Liabiliti_7

Net Defined Benefit Liabilities - Summary of Principal Actuarial Assumptions (Detail)	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Bottom of range [member]
Disclosure of defined benefit plans [line items]
Discount rate			1.93%
Top of range [member]
Disclosure of defined benefit plans [line items]
Discount rate	5.05%	2.55%
Salary growth rate	5.15%	5.10%	4.88%

Net Defined Benefit Liabiliti_8

Net Defined Benefit Liabilities - Summary of Sensitivity of the Defined Benefit Obligations (Detail) ₩ in Millions	Dec. 31, 2022 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	₩ (108,725)
Effect on defined benefit obligation, decrease in assumption	₩ 117,362
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	₩ 113,037
Effect on defined benefit obligation, decrease in assumption	₩ (105,541)

Net Defined Benefit Liabiliti_9

Net Defined Benefit Liabilities - Additional Information (Detail) ₩ in Millions	12 Months Ended
	Dec. 31, 2022 KRW (₩)
Disclosure of net defined benefit liability (asset) [Line Items]
Expected contributions to post-employment benefit plans	₩ 281,118
Weighted average duration of the defined benefit obligations	6 years

Net Defined Benefit Liabilit_10

Net Defined Benefit Liabilities - Summary of Expected Maturity Analysis of Undiscounted Pension Benefits (Detail) ₩ in Millions	Dec. 31, 2022 KRW (₩)
Disclosure of net defined benefit liability (asset) [Line Items]
Pension benefits	₩ 3,346,251
Less than 1 year [member]
Disclosure of net defined benefit liability (asset) [Line Items]
Pension benefits	231,594
Between 1-2 years [member]
Disclosure of net defined benefit liability (asset) [Line Items]
Pension benefits	336,926
Between 2-5 years [member]
Disclosure of net defined benefit liability (asset) [Line Items]
Pension benefits	855,642
More than 5 years [member]
Disclosure of net defined benefit liability (asset) [Line Items]
Pension benefits	₩ 1,922,089

Defined Contribution Plan - Add

Defined Contribution Plan - Additional Information (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Classes of employee benefits expense [abstract]
Defined Contribution plan recognized expenses	₩ 72,576	₩ 71,068	₩ 61,912

Commitments and Contingencies -

Commitments and Contingencies - Summary of Major Commitments with Local Financial Institutions (Detail) - Dec. 31, 2022 € in Millions, ₩ in Millions, ¥ in Millions, $ in Millions, $ in Millions	KRW (₩)	USD ($)	EUR (€)	SGD ($)	JPY (¥)
Disclosure of detailed information about borrowings [line items]
Limit	₩ 3,277,690	$ 2,983,017	€ 7,700	$ 284,000	¥ 0
Used amount	516,447	2,142,507	7,700	284,000	400,000
Bank overdraft [member] | Kookmin Bank and others [member]
Disclosure of detailed information about borrowings [line items]
Limit	372,000
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	1,974
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	567,150
Used amount	28,298
Plus electronic notes payable [member] | Industrial Bank of Korea [member]
Disclosure of detailed information about borrowings [line items]
Limit	50,000
Used amount	1,663
Working capital loan | Korea Development Bank and others [member]
Disclosure of detailed information about borrowings [line items]
Limit	1,415,600
Used amount	165,100
Working capital loan | Shinhan Bank [member]
Disclosure of detailed information about borrowings [line items]
Limit | $		72,507
Used amount | $		72,507
Working capital loan | 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	824,000
Used amount	309,680
Derivatives transaction limit [member]
Disclosure of detailed information about borrowings [line items]
Used amount | $		100,000
Derivatives transaction limit [member] | Korea Development Bank and others [member]
Disclosure of detailed information about borrowings [line items]
Limit | $		2,510,510
Used amount | $		1,970,000
Derivatives transaction limit [member] | Shinhan Bank [member]
Disclosure of detailed information about borrowings [line items]
Limit	8,000
Used amount	₩ 8,000
Derivatives transaction limit [member] | DBS Bank [Member]
Disclosure of detailed information about borrowings [line items]
Limit | $				284,000
Used amount | $				$ 284,000
Derivatives transaction limit [member] | 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, 2022 $ in Thousands, ₩ in Millions	KRW (₩)	USD ($)
Disclosure of detailed information about borrowings [line items]
Guarantees limit	₩ 2,319,939	$ 109,645
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 | $		273
Guarantee for payment in foreign currency [member] | Kookmin Bank [member]
Disclosure of detailed information about borrowings [line items]
Guarantees limit | $		6,484
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	36,298
Guarantee For Payment In Foreign Currency And Others [Member] | Shinhan Bank [member]
Disclosure of detailed information about borrowings [line items]
Guarantees limit | $		77,837
Refund guarantee for advances received [Member] | Korea Development Bank [member]
Disclosure of detailed information about borrowings [line items]
Guarantees limit | $		6,880
Guarantees for depositions [Member] | H S B C [Member]
Disclosure of detailed information about borrowings [line items]
Guarantees limit | $		$ 871
Performance Guarantee And Others [Member] | Seoul Guarantee Insurance Company [Member]
Disclosure of detailed information about borrowings [line items]
Guarantees limit	783,247
Performance Guarantee And Others [Member] | Korea Software Financial Cooperative [member]
Disclosure of detailed information about borrowings [line items]
Guarantees limit	1,445,072
Performance Guarantee And Others [Member] | Korea Specialty Contractor Financial Cooperative [Member]
Disclosure of detailed information about borrowings [line items]
Guarantees limit	531
Performance Guarantee And Others [Member] | Korea Housing Finance Corporation [Member]
Disclosure of detailed information about borrowings [line items]
Guarantees limit	14,464
Performance Guarantee And Others [Member] | Information & Communication Financial Cooperative [Member]
Disclosure of detailed information about borrowings [line items]
Guarantees limit	₩ 28,027

Commitments and Contingencies_3

Commitments and Contingencies - Summary of Guarantees Provided by the Group for Third Parties (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Disclosure of detailed information about borrowings [line items]
Used amount	₩ 10,006,685	₩ 8,437,703
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	₩ 672
KT Engineering Co Ltd [Member] | Suhyup Bank [Member] | Guarantees [member]
Disclosure of detailed information about borrowings [line items]
Subject to payment guarantees	SPP Inc.
Limit	₩ 3,250
Used amount	₩ 345
KT Engineering Co Ltd [Member] | Suhyup Bank One [Member] | Guarantees [member]
Disclosure of detailed information about borrowings [line items]
Subject to payment guarantees	Korea Cell Inc.
Limit	₩ 3,250
Used amount	₩ 338
KT Engineering Co Ltd [Member] | Suhyup Bank Two [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	₩ 345
KT Alpha Co Ltd KT Hitel 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	₩ 860
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	₩ 5,654
Used amount	₩ 986
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 Engineering Co Ltd [Member] | Suhyup Bank Two [Member] | Guarantees [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Feb. 17, 2014
Bottom of range [member] | KT Alpha Co Ltd KT Hitel Co Ltd [Member] | T-commerce cash payers [Member] | Guarantees [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Apr. 14, 2022
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 Engineering Co Ltd [Member] | Suhyup Bank Two [Member] | Guarantees [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Feb. 16, 2024
Top of range [member] | KT Alpha Co Ltd KT Hitel Co Ltd [Member] | T-commerce cash payers [Member] | Guarantees [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Apr. 14, 2023

Commitments and Contingencies_4

Commitments and Contingencies - Summary of the issuance of real estate collateral trust and beneficiary certificates of the Group (Detail) - Real Estate Collateral Trust [Member] ₩ in Millions	Dec. 31, 2022 KRW (₩)
NongHyup Bank [Member] | First Placing Of Collateral Asset [Member]
Disclosure Of Real Estate Collateral Trust And Beneficiary Certificates Of The Group [Line Items]
Commitment (limit) amount	₩ 100,000
Amount provided as collateral for beneficiary rights	120,000
Kyobo Life Insurance [Member] | First Placing Of Collateral Asset [Member]
Disclosure Of Real Estate Collateral Trust And Beneficiary Certificates Of The Group [Line Items]
Commitment (limit) amount	180,000
Amount provided as collateral for beneficiary rights	216,000
Standard Chartered Bank Korea Limited [Member] | First Placing Of Collateral Asset [Member]
Disclosure Of Real Estate Collateral Trust And Beneficiary Certificates Of The Group [Line Items]
Commitment (limit) amount	120,000
Amount provided as collateral for beneficiary rights	144,000
Standard Chartered Bank Korea Limited [Member] | Second Placing Of Collateral Asset [Member]
Disclosure Of Real Estate Collateral Trust And Beneficiary Certificates Of The Group [Line Items]
Commitment (limit) amount	20,000
Amount provided as collateral for beneficiary rights	24,000
Samsung Life Insurance [Member] | First Placing Of Collateral Asset [Member]
Disclosure Of Real Estate Collateral Trust And Beneficiary Certificates Of The Group [Line Items]
Commitment (limit) amount	100,000
Amount provided as collateral for beneficiary rights	120,000
Industrial Bank Of Korea [member] | Second Placing Of Collateral Asset [Member]
Disclosure Of Real Estate Collateral Trust And Beneficiary Certificates Of The Group [Line Items]
Commitment (limit) amount	40,000
Amount provided as collateral for beneficiary rights	48,000
Korea Investment Capital [Member] | Second Placing Of Collateral Asset [Member]
Disclosure Of Real Estate Collateral Trust And Beneficiary Certificates Of The Group [Line Items]
Commitment (limit) amount	40,000
Amount provided as collateral for beneficiary rights	48,000
BNK Capital [Member] | Second Placing Of Collateral Asset [Member]
Disclosure Of Real Estate Collateral Trust And Beneficiary Certificates Of The Group [Line Items]
Commitment (limit) amount	30,000
Amount provided as collateral for beneficiary rights	36,000
NH Capital [Member] | Second Placing Of Collateral Asset [Member]
Disclosure Of Real Estate Collateral Trust And Beneficiary Certificates Of The Group [Line Items]
Commitment (limit) amount	20,000
Amount provided as collateral for beneficiary rights	24,000
LOTTE Engineering Construction [Member] | Third Placing Of Collateral Asset [Member]
Disclosure Of Real Estate Collateral Trust And Beneficiary Certificates Of The Group [Line Items]
Commitment (limit) amount	0
Amount provided as collateral for beneficiary rights	₩ 736,921

Commitments and Contingencies_5

Commitments and Contingencies - Summary of the issuance of real estate collateral trust and beneficiary certificates of the Group (Parenthetical) (Detail) ₩ in Millions	Dec. 31, 2022 KRW (₩)
LOTTE Engineering Construction [Member]
Disclosure Of Real Estate Collateral Trust And Beneficiary Certificates Of The Group [Line Items]
Construction contract amount	₩ 614,101

Commitments and Contingencies_6

Commitments and Contingencies - Additional Information (Detail) $ in Thousands, ₩ in Millions	12 Months Ended
	Dec. 31, 2022 KRW (₩) EUR (€)	Dec. 31, 2022 USD ($) EUR (€)	Dec. 31, 2021 KRW (₩)
Commitments and contingencies [abstract]
Severally liable for reimbursement	₩ 653
Number of lawsuits | €	189	189
Litigation settlement claim amount	₩ 80,279		₩ 101,597
Litigation provision	₩ 36,329
New town development consortium percentage of ownership interest	2.50%	2.50%
Contract amount not yet recognized as liabilities	₩ 1,294,823		₩ 1,336,758
Additional cumulative investment amount	₩ 5,473	$ 34,050

Leases - Summary of balance she

Leases - Summary of balance sheet information about leases for lessee (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure of balance sheet information about leases for lessee [Line Items]
Right-of-use assets	₩ 1,280,334	₩ 1,248,308
Investment property (buildings)	1,933,358	1,720,654	₩ 1,368,453
Lease liabilities
Lease liability recognized	1,172,038	1,159,369
Previously stated [member]
Disclosure of balance sheet information about leases for lessee [Line Items]
Investment property (buildings)	0	1
Lease liabilities
Current	315,892	332,702
Non-Current	856,146	826,667
Lease liability recognized	1,172,038	1,159,369
Property and building [member] | Previously stated [member]
Disclosure of balance sheet information about leases for lessee [Line Items]
Right-of-use assets	1,081,067	1,086,133
Machinery and communication line facilities [member] | Previously stated [member]
Disclosure of balance sheet information about leases for lessee [Line Items]
Right-of-use assets	50,794	64,443
Other [member] | Previously stated [member]
Disclosure of balance sheet information about leases for lessee [Line Items]
Right-of-use assets	₩ 148,473	₩ 97,732

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, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure of statement of profit or loss information about leases for lessee [Line Items]
Depreciation of Right-of-use assets	₩ 396,214	₩ 398,716	₩ 404,175
Depreciation of Investment Properties	15	1,794	19,113
Interest expense relating to lease liabilities	41,469	36,651	44,091
Expense relating to short-term leases	12,876	7,984	10,998
Expense relating to leases of low-value assets that are not short-term leases	26,813	26,033	25,894
Expense relating to variable lease payments not included in lease liabilities	4,827	8,400	8,096
Property and building [member]
Disclosure of statement of profit or loss information about leases for lessee [Line Items]
Depreciation of Right-of-use assets	305,120	303,984	290,168
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	31,140	41,794	58,419
Other [member]
Disclosure of statement of profit or loss information about leases for lessee [Line Items]
Depreciation of Right-of-use assets	₩ 59,954	₩ 52,938	₩ 55,588

Leases - Additional Information

Leases - Additional Information (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure Of Arrangement Involving Legal Form Of Lease [Abstract]
Cash outflow for leases	₩ 464,337	₩ 468,360	₩ 492,772
Increase decrease in right of use assets	₩ 405,453	₩ 426,854

Share Capital - Summary of Shar

Share Capital - Summary of Share Capital (Detail) ₩ in Millions	Dec. 31, 2022 KRW (₩) shares	Dec. 31, 2022 $ / shares	Dec. 31, 2021 KRW (₩) shares	Dec. 31, 2021 $ / 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	261,111,808		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, 2022	Dec. 31, 2021
Disclosure of classes of share capital [abstract]
Treasury shares	51,787,959	51,787,959

Retained Earnings - Summary of

Retained Earnings - Summary of Retained Earnings (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2022	Dec. 31, 2021
Miscellaneous equity [abstract]
Legal reserve	₩ 782,249	₩ 782,249
Voluntary reserves	4,651,362	4,651,362
Unappropriated retained earnings	8,821,705	7,853,779
Total	₩ 14,255,316	₩ 13,287,390

Retained Earnings - Summary o_2

Retained Earnings - Summary of Retained Earnings (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
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, 2022	Dec. 31, 2021	Dec. 31, 2020
Total accumulated other comprehensive income	₩ (77,776)	₩ 117,469	₩ 86,051
Changes in investments in associates and joint ventures [member]
Total accumulated other comprehensive income	(11,752)	(3,461)	16,257
Gain (loss) on derivatives valuation [member]
Total accumulated other comprehensive income	(7,109)	25,031	19,809
Gain (loss) on valuation of financial assets at fair value through other comprehensive income [member]
Total accumulated other comprehensive income	(52,100)	108,685	61,438
Exchange differences on translation for foreign operations [member]
Total accumulated other comprehensive income	₩ (6,815)	₩ (12,786)	₩ (11,453)

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, 2022	Dec. 31, 2021
Beginning	₩ 117,469	₩ 86,051
Increase /decrease	(99,824)	168,001
Reclassified to gain or loss	(95,421)	(136,583)
Ending	(77,776)	117,469
Changes in investments in associates and joint ventures [member]
Beginning	(3,461)	16,257
Increase /decrease	(8,291)	(19,718)
Ending	(11,752)	(3,461)
Gain (loss) on derivatives valuation [member]
Beginning	25,031	19,809
Increase /decrease	63,281	141,805
Reclassified to gain or loss	(95,421)	(136,583)
Ending	(7,109)	25,031
Gain (loss) on valuation of financial assets at fair value through other comprehensive income [member]
Beginning	108,685	61,438
Increase /decrease	(160,785)	47,247
Ending	(52,100)	108,685
Exchange differences on translation for foreign operations [member]
Beginning	(12,786)	(11,453)
Increase /decrease	5,971	(1,333)
Ending	₩ (6,815)	₩ (12,786)

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, 2022	Dec. 31, 2021	Feb. 09, 2023
Miscellaneous equity [abstract]
Treasury stock	₩ (202,295)	₩ (1,009,798)	₩ (100,000)
Gain or loss on disposal of treasury stock	(41,503)	(8,658)
Share-based payments	6,222	4,068
Others	(334,576)	(418,692)
Total	₩ (572,152)	₩ (1,433,080)

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, 2022	Dec. 31, 2021
Miscellaneous equity [abstract]
Number Of treasury shares reissued	20,105,609
Number of treasury shares acquired	128,923
Treasury shares, Amount directly reflected in equity	₩ 14,886	₩ 4,080

Accumulated Other Comprehensi_7

Accumulated Other Comprehensive Income and Other Components of Equity - Summary of Treasury Stock (Detail) - KRW (₩) ₩ in Millions	Feb. 09, 2023	Dec. 31, 2022	Dec. 31, 2021
Miscellaneous equity [abstract]
Number of shares (in shares)		5,069,130	25,303,662
Amounts (in millions of Korean won)	₩ 100,000	₩ 202,295	₩ 1,009,798

Share-based Payments - Summary

Share-based Payments - Summary of Details of Share-based Payments (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
15th grant
Disclosure of terms and conditions of share-based payment arrangement [line items]
Fair value per option		₩ 32,397
Total compensation costs		5,005
Employee wage negotiation [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Fair value per option		30,950
Total compensation costs		₩ 40,083
16th grant
Disclosure of terms and conditions of share-based payment arrangement [line items]
Fair value per option	₩ 36,941
Total compensation costs	₩ 6,222

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, 2022	Dec. 31, 2021
Disclosure of terms and conditions of share-based payment arrangement [Line Items]
Beginning	284,209	398,856
Grant	258,509	1,716,541
Expired	(155,286)	(264,286)
Exercised	(128,923)	(1,566,902)
Ending	258,509	284,209
14th grant [Member]
Disclosure of terms and conditions of share-based payment arrangement [Line Items]
Beginning	0	398,856
Grant		0
Expired		(264,286)
Exercised		(134,570)
Ending		0
15th grant
Disclosure of terms and conditions of share-based payment arrangement [Line Items]
Beginning	284,209
Grant	0	284,209
Expired	(155,286)
Exercised	(128,923)
Ending	0	284,209
Employee wage negotiation [Member]
Disclosure of terms and conditions of share-based payment arrangement [Line Items]
Grant		1,432,332
Exercised		(1,432,332)
16th grant
Disclosure of terms and conditions of share-based payment arrangement [Line Items]
Grant	258,509
Ending	258,509

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, 2022	Dec. 31, 2021
Disclosure of terms and conditions of share-based payment arrangement [abstract]
Weighted average exercise price of share options exercised	$ 35,450	$ 31,122

Revenue from Contracts with C_3

Revenue from Contracts with Customers and Relevant Contract Assets and Liabilities - Detail Explanation of Revenue in the Consolidated Statement of operations (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure of disaggregation of revenue from contracts with customers [abstract]
Revenue from contracts with customers	₩ 25,432,727	₩ 24,712,128	₩ 23,895,631
Revenue from other sources	206,128	185,877	203,763
Other income (Note 27)	595,351	307,654	341,253
Operating revenue	₩ 26,234,206	₩ 25,205,659	₩ 24,440,647

Revenue from Contracts with C_4

Revenue from Contracts with Customers and Relevant Contract Assets and Liabilities - Detail explanation of Operating revenue (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure of disaggregation of revenue from contracts with customers [abstract]
Mobile services	₩ 7,013,889	₩ 6,936,485	₩ 6,805,218
Fixed-line services	5,056,513	4,960,338	4,827,015
Fixed-line and VoIP telephone services	1,378,265	1,465,059	1,463,553
Broadband Internet access services	2,504,833	2,343,591	2,256,188
Data communication services	1,173,415	1,151,689	1,107,274
Media and content	3,099,776	2,800,630	2,637,691
Financial services	3,836,589	3,661,896	3,493,920
Sale of goods	3,393,646	3,532,973	3,593,127
Others	3,833,793	3,313,337	3,083,676
Total	₩ 26,234,206	₩ 25,205,659	₩ 24,440,647

Revenue from Contracts with C_5

Revenue from Contracts with Customers and Relevant Contract Assets and Liabilities - Detail Analysis of Contract with Customer Assets and Liabilities (Detail) - KRW (₩) ₩ in Millions		Dec. 31, 2022	Dec. 31, 2021
Disclosure of revenue from contracts with customers [line items]
Contract assets		₩ 802,253	₩ 745,085
Contract liabilities		284,107	323,651
Deferred revenue	[1]	46,493	35,577
Revenue from contracts with customers [member]
Disclosure of revenue from contracts with customers [line items]
Contract assets		963,133	821,901
Contract liabilities		344,869	360,098
Deferred revenue		₩ 81,653	₩ 81,136
[1]The amounts include adjustments arising from adoption of IFRS 15 (Note 26).

Revenue from Contracts with C_6

Revenue from Contracts with Customers and Relevant Contract Assets and Liabilities - Detail Analysis of Contract with Customer Assets and Liabilities (Parenthetical) (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2022	Dec. 31, 2021
Disclosure of revenue from contracts with customers [line items]
Contract assets	₩ 802,253	₩ 745,085
Contract liabilities	284,107	323,651
long term construction contract [Member]
Disclosure of revenue from contracts with customers [line items]
Contract assets	160,880	76,816
Contract liabilities	₩ 60,762	₩ 36,447

Revenue from Contracts with C_7

Revenue from Contracts with Customers and Relevant Contract Assets and Liabilities - Detail Analysis of Contract Costs Recognized as Assets (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Incremental cost of contract establishment [Member]
Statement [Line Items]
Incremental cost of contract establishment	₩ 1,744,096	₩ 1,726,401	₩ 1,726,191
Cost of Contract performance [Member]
Statement [Line Items]
Incremental cost of contract establishment	₩ 73,582	₩ 74,843	₩ 78,757

Revenue from Contracts with C_8

Revenue from Contracts with Customers and Relevant Contract Assets and Liabilities - Additional Information (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure of disaggregation of revenue from contracts with customers [abstract]
Operating expenses	₩ 1,793,013	₩ 1,842,621	₩ 1,831,638

Revenue from Contracts with C_9

Revenue from Contracts with Customers and Relevant Contract Assets and Liabilities - Detail of Revenue Arising from Carried-Forward Contract Liabilities (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure of disaggregation of revenue from contracts with customers [abstract]
Allocation of the transaction price	₩ 246,843	₩ 275,965	₩ 251,975
Deferred revenue of joining/installment fee	44,204	42,100	42,685
Total	₩ 291,047	₩ 318,065	₩ 294,660

Other Income from Operating R_3

Other Income from Operating Revenue - Summary Of Other Income (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Text block [abstract]
Gains on disposal of property and equipment and investment properties	₩ 52,603	₩ 54,007	₩ 20,289
Gains on disposal of intangible assets	622	1,726	2,961
Gain on disposal of right-of-use assets	3,326	3,138	5,797
Compensation on property and equipment	159,849	148,927	168,263
Gains on government subsidies	44,473	43,822	31,906
Gain on disposal of investments in subsidiaries	216,591	244	0
Reversal of other allowance for bad debts	850	508	890
Others	117,037	55,282	111,147
Total	₩ 595,351	₩ 307,654	₩ 341,253

Operating Expenses - Summary of

Operating Expenses - Summary of Operating Expenses (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Profit (loss) [abstract]
Salaries and wages	₩ 4,495,885	₩ 4,215,810	₩ 4,123,680
Depreciation	2,637,463	2,605,594	2,605,128
Depreciation of right-of-use assets	396,214	398,716	404,175
Amortization of intangible assets	622,202	603,327	624,982
Commissions	1,295,434	1,125,944	965,461
Interconnection charges	479,500	507,567	500,081
International interconnection fee	186,253	192,008	172,529
Purchase of inventories	3,656,040	3,753,792	3,681,801
Changes of inventories	(195,046)	20,491	257,041
Sales commission	2,353,909	2,343,375	2,337,127
Service cost	2,334,386	2,296,324	2,102,875
Utilities	368,348	364,373	360,797
Taxes and dues	276,962	268,651	283,197
Rent	160,848	123,246	136,355
Insurance premium	68,245	66,717	71,018
Installation fee	150,140	154,542	132,117
Advertising expenses	195,519	171,400	132,466
Research and development expenses	174,936	168,969	156,940
Card service cost	3,127,673	3,114,047	2,941,669
Loss on disposal of property and equipment	81,415	71,417	75,879
Loss on disposal of intangible assets	7,015	3,885	3,207
Loss on disposal of right-of-use assets	2,348	11,457	7,844
Direct cost of government subsidies	44,022	42,732	31,447
Loss on disposal of investments in subsidiaries	0	13,727	0
Impairment loss on property and equipment	16,094	2,115	79,775
Impairment loss on intangible assets	30,965	3,747	211,637
Donations	15,642	10,981	20,745
Other allowance for bad debts	17,551	28,066	51,333
Others	1,266,086	823,242	947,008
Total	₩ 24,266,049	₩ 23,506,262	₩ 23,418,314

Operating Expenses - Summary _2

Operating Expenses - Summary of Details of Employee Benefits (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Profit (loss) [abstract]
Short-term employee benefits	₩ 4,161,874	₩ 3,837,359	₩ 3,770,786
Post-employment benefits (Defined benefit plan)	225,404	236,831	239,102
Post-employment benefits (Defined contribution plan)	72,576	71,068	61,912
Share-based payment	16,799	47,415	28,604
Others	19,232	23,137	23,276
Total	₩ 4,495,885	₩ 4,215,810	₩ 4,123,680

Financial Income and Costs - Su

Financial Income and Costs - Summary of Details of Financial Income (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Profit (loss) [abstract]
Interest income	₩ 271,925	₩ 273,460	₩ 270,571
Gain on foreign currency transactions	67,976	19,976	17,493
Gain on foreign currency translation	43,092	32,768	164,351
Gain on derivative transactions	50,668	2,215	9,397
Gain on valuation of derivatives	182,998	255,149	172
Gain on valuation of financial instruments	31,032	90,653	33,868
Others	42,737	52,062	2,762
Total	₩ 690,428	₩ 726,283	₩ 498,614

Financial Income and Costs - _2

Financial Income and Costs - Summary of Details of Financial Expense (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure Of Finance Income [line items]
Interest expenses	₩ 293,854	₩ 263,389	₩ 263,579
Loss on foreign currency transactions	81,171	13,105	27,805
Loss on foreign currency translation	200,109	213,689	26,340
Loss on derivative transactions	24,331	6,287	1,406
Loss on valuation of derivatives	21,601	15,947	163,763
Loss on valuation of financial instruments	65,660	25,994	15,646
Others	485	2,207	692
Total	749,908	563,330	507,383
Loans and receivables [member]
Disclosure Of Finance Income [line items]
Loss on disposal of trade receivables	₩ 62,697	₩ 22,712	₩ 8,152

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, 2022	Dec. 31, 2021
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Deferred income tax assets	₩ 579,090	₩ 423,728
Deferred income tax liabilities	(967,650)	(643,958)
Gross carrying amount [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Deferred income tax assets	2,306,400	2,152,442
Deferred income tax liabilities	(2,694,960)	(2,372,672)
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	398,710	398,329
Deferred income tax liabilities	(586,522)	(642,954)
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	1,907,690	1,754,113
Deferred income tax liabilities	₩ (2,108,438)	₩ (1,729,718)

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, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	₩ (220,230)	₩ 4,367
Statements of profit or loss	(169,961)	(229,545)	₩ (72,124)
Other comprehensive income	1,631	4,948
Ending	(388,560)	(220,230)	4,367
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	(240,633)	(181,564)
Statements of profit or loss	(18,299)	(68,166)
Other comprehensive income	3,748	9,097
Ending	(255,184)	(240,633)	(181,564)
Deferred tax liabilities depreciation and impairment loss [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	(88,588)	(4,175)
Statements of profit or loss	(62,845)	(84,413)
Ending	(151,433)	(88,588)	(4,175)
Deferred tax liabilities plan assets [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	(538,928)	(521,257)
Statements of profit or loss	(5,294)	(17,340)
Other comprehensive income	1,322	(331)
Ending	(542,900)	(538,928)	(521,257)
Deferred tax liabilities advanced depreciation provision [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	(339,005)	(311,918)
Statements of profit or loss	(182,934)	(27,087)
Ending	(521,939)	(339,005)	(311,918)
Deferred tax liabilities contract assets [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	(493,917)	(509,509)
Statements of profit or loss	69,615	15,592
Ending	(424,302)	(493,917)	(509,509)
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	(336)	(627)
Statements of profit or loss	(73)	291
Other comprehensive income	(11)
Ending	(420)	(336)	(627)
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	(47,521)	(30,623)
Statements of profit or loss	(71,396)	(33,267)
Other comprehensive income	58,288	16,369
Ending	(60,629)	(47,521)	(30,623)
Other deferred tax liabilities [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	(623,744)	(472,153)
Statements of profit or loss	(111,135)	(150,013)
Other comprehensive income	(3,274)	(1,578)
Ending	(738,153)	(623,744)	(472,153)
Deferred tax liabilities [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	(2,372,672)	(2,031,826)
Statements of profit or loss	(382,361)	(364,403)
Other comprehensive income	60,073	23,557
Ending	(2,694,960)	(2,372,672)	(2,031,826)
Deferred tax assets depreciation and impairment loss [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	225,821	226,960
Statements of profit or loss	(36,989)	(1,139)
Ending	188,832	225,821	226,960
Deferred tax assets contract liabilities [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	148,454	140,494
Statements of profit or loss	(27,165)	7,960
Ending	121,289	148,454	140,494
Deferred tax assets defined benefit liabilities [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	571,336	598,364
Statements of profit or loss	(22,423)	(8,663)
Other comprehensive income	(67,055)	(18,365)
Ending	481,858	571,336	598,364
Deferred tax assets provisions [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	172,871	167,384
Statements of profit or loss	(20,894)	5,487
Other comprehensive income	(22)
Ending	151,955	172,871	167,384
Other deferred tax assets [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	899,543	758,060
Statements of profit or loss	351,317	141,727
Other comprehensive income	8,635	(244)
Ending	1,259,495	899,543	758,060
Temporary differences [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	(354,647)	(140,564)
Statements of profit or loss	(138,515)	(219,031)
Other comprehensive income	1,631	4,948
Ending	(491,531)	(354,647)	(140,564)
Deferred tax assets [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	2,018,025	1,891,262
Statements of profit or loss	243,846	145,372
Other comprehensive income	(58,442)	(18,609)
Ending	2,203,429	2,018,025	1,891,262
Deferred tax assets tax credit carry forwards [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	134,417	144,931
Statements of profit or loss	(31,446)	(10,514)
Ending	₩ 102,971	₩ 134,417	₩ 144,931

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, 2022	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets and liabilities [abstract]
Gain (loss) on valuation of financial assets at fair value through other comprehensive income, Before recognition	₩ (216,862)	₩ 163,892	₩ 54,969
Gain (loss) on valuation of hedge instruments (loss) liabilities, Before recognition	(42,510)	6,916	37,247
Remeasurements of net defined benefit liabilities, Before recognition	247,162	74,518	(77,382)
Share of Gain (loss) of associates and joint ventures, and others, Before recognition	(14,931)	(34,909)	25,538
Exchange differences on translation for foreign operations, Before recognition	23,316	683	(3,614)
Gain or loss on disposal of treasury stock, Before recognition	(59,308)	(15,657)	(27,786)
Total, Before recognition	(63,133)	195,443	8,972
Gain (loss) on valuation of financial assets at fair value through other comprehensive income, Tax effect	58,288	(34,112)	(12,972)
Gain (loss) on valuation of hedge instruments (loss) liabilities, Tax effect	11,180	(1,644)	(9,860)
Remeasurements of net defined benefit liabilities, Tax effect	(65,733)	(18,696)	17,201
Share of Gain (loss) of associates and joint ventures, and others, Tax effect	3,748	9,097	(8,820)
Exchange differences on translation for foreign operations, Tax effect	(5,852)	(178)	948
Gain or loss on disposal of treasury stock, Tax effect	14,886	4,080	7,288
Total, Tax effect	16,517	(41,453)	(6,215)
Gain (loss) on valuation of financial assets at fair value through other comprehensive income, After recognition	(158,574)	129,780	41,997
Gain (loss) on valuation of hedge instruments (loss) liabilities, After recognition	(31,330)	5,272	27,387
Remeasurements of net defined benefit liabilities, After recognition	181,429	55,822	(60,181)
Share of Gain (loss) of associates and joint ventures, and others, After recognition	(11,183)	(25,812)	16,718
Exchange differences on translation for foreign operations, After recognition	17,464	505	(2,666)
Gain or loss on disposal of treasury stock, After recognition	(44,422)	(11,577)	(20,498)
Total other comprehensive income	₩ (46,616)	₩ 153,990	₩ 2,757

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, 2022	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets and liabilities [abstract]
Current income tax expense	₩ 335,796	₩ 289,471	₩ 213,225
Impact of change in deferred taxes	169,961	229,545	72,124
Income tax expense	₩ 505,757	₩ 519,016	₩ 285,349

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, 2022	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets and liabilities [abstract]
Profit before income tax expense	₩ 1,891,392	₩ 1,978,411	₩ 1,031,605
Statutory income tax expense	509,771	533,701	273,329
Tax effect
Income not taxable for taxation purposes	(47,550)	(4,307)	(24,657)
Non-deductible expenses	53,398	20,570	31,741
Tax credit	(54,895)	(31,517)	(47,056)
Additional payment of income taxes	11,744	(221)	429
Adjustments in deferred tax from changes in tax rate	(41,545)
Tax effect and adjustment on consolidation
Goodwill impairment	5,809
Eliminated dividend income form subsidiaries		7,264	20,682
Changes of out-side tax effect	29,922	4,738	38,552
Intangible Asset impairment and amortization	5,276	796	3,790
Reversal expenses of contract cost assets	(4,800)	(2,932)	(6,643)
Change In Scope Of Consolidation		(5,128)
Others	38,627	(3,948)	(4,818)
Income tax expense	₩ 505,757	₩ 519,016	₩ 285,349

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, 2022	Dec. 31, 2021
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deductible temporary differences for which no deferred tax asset is recognised	₩ 3,876,693	₩ 2,583,033
Taxable Temporary Differences For Which No Deferred Tax Asset and Liabilities Is Recognised	1,073,736	568,540
Investment in subsidiaries, associates, and joint ventures
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deductible temporary differences for which no deferred tax asset is recognised	3,384,295	2,355,539
Taxable Temporary Differences For Which No Deferred Tax Asset and Liabilities Is Recognised	857,076	568,540
Unused tax loss
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deductible temporary differences for which no deferred tax asset is recognised	103,326	106,853
Unused Tax credit
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deductible temporary differences for which no deferred tax asset is recognised	1,988	1,376
Others
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deductible temporary differences for which no deferred tax asset is recognised	387,084	119,265
Others
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	₩ 216,660	₩ 0

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, 2022	Dec. 31, 2021
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax losses for which no deferred tax asset recognised	₩ 103,326	₩ 106,853
2022
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax losses for which no deferred tax asset recognised		4,249
2023
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax losses for which no deferred tax asset recognised	72,512	76,133
2024
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax losses for which no deferred tax asset recognised	5,011	4,484
2025
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax losses for which no deferred tax asset recognised	3,701	2,836
2026
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax losses for which no deferred tax asset recognised	2,112	2,390
2027
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax losses for which no deferred tax asset recognised	2,534	3,419
2028
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax losses for which no deferred tax asset recognised	396	2,091
2029
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax losses for which no deferred tax asset recognised	617	2,579
2030
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax losses for which no deferred tax asset recognised	2,198	3,111
2031
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax losses for which no deferred tax asset recognised	1,360	1,841
After 2032
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax losses for which no deferred tax asset recognised	₩ 12,885	₩ 3,720

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, 2022	Dec. 31, 2021	Dec. 31, 2020
Basic earnings per share [abstract]
Profit (loss) attributable to ordinary shares of owners of the Controlling Company	₩ 1,259,686	₩ 1,354,537	₩ 700,889
Weighted average number of ordinary shares outstanding	242,235,332	235,201,782	245,207,307
Basic earnings per share (In Korean won)	₩ 5,200	₩ 5,759	₩ 2,858
Profit attributable to ordinary shares of owners of the Controlling Company (In millions of Korean won)	₩ 1,259,686	₩ 1,354,537	₩ 700,889
Adjustment to net income attributable to ordinary shares (in millions of Korean won)	(496)	0	0
Diluted profit attributable to ordinary shares (In millions of Korean won)	₩ 1,259,190	₩ 1,354,537	₩ 700,889
Number of dilutive potential ordinary shares outstanding	91,931	483,760	69,598
Weighted average number of ordinary shares outstanding	242,327,263	235,685,542	245,276,905
Diluted earnings per share (In Korean won)	₩ 5,196	₩ 5,747	₩ 2,858

Dividend - Additional Informati

Dividend - Additional Information (Detail) - KRW (₩) ₩ / shares in Units, ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure of Dividends [abstract]
Dividends paid	₩ 450,394	₩ 326,487	₩ 269,659
Dividends paid per share	₩ 1,910	₩ 1,350	₩ 1,100
Dividends declared	₩ 501,844
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, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows from (used in) operating activities [abstract]
Profit for the year	₩ 1,385,635	₩ 1,459,395	₩ 746,256
Adjustments to reconcile net income
Income tax expense	505,757	519,016	285,349
Interest income	(340,794)	(300,900)	(291,425)
Interest expense	320,914	268,847	265,035
Dividends income	(14,121)	(21,525)	(4,442)
Depreciation	2,687,191	2,643,894	2,635,307
Amortization of intangible assets	627,261	604,744	628,154
Depreciation of right-of-use assets	396,214	398,716	404,174
Provision for severance benefits	240,506	253,491	255,615
Impairment losses on trade receivables	132,102	105,344	139,957
Share of net profit or loss of associates and joint ventures	16,821	(116,061)	(18,041)
Loss(gain) on disposal of associates and joint ventures	(38,024)	1	111
Loss(gain) on the disposal of subsidiaries	(216,591)	13,483	0
Loss(gain) on disposal of right-of-use assets	(978)	8,319	2,047
Impairment losses on assets held for sale	0	11	0
Impairment loss on property and equipment and investment in properties	16,094	2,115	0
Loss on disposal of property and equipment and investment in properties	(66,317)	17,410	55,590
Loss on disposal of intangible assets	6,393	2,159	246
Loss on impairment of intangible assets	30,674	3,747	211,637
Loss(gain) on foreign currency translation	157,017	180,921	(138,011)
Loss(gain) on valuation and settlement of derivatives, net	(205,381)	(235,130)	155,600
Loss on disposal of financial assets at fair value through profit or loss	(2,347)	(29,974)	(29,974)
Gain on valuation of financial assets at fair value through profit or loss	44,833	(64,660)	(64,660)
Loss(gain) on disposal of financial assets at amortized cost	3	(35)	(138)
Others	(49,891)	84,625	127,949
Change in operating assets and liabilities, net of effects from purchase of controlled entity and sale of engineering division
Decrease(increase) in trade receivables	(43,787)	327,031	66,462
Decrease(increase) in other receivables	(1,598,216)	(328,610)	685,209
Decrease(increase) in other current assets	(101,947)	(89,230)	9,089
Decrease(increase) in other non-current assets	(120,054)	(143,087)	(86,039)
Decrease(increase) in inventories	(179,255)	32,798	288,507
Increase(decrease) in trade payables	(368,355)	289,044	(135,760)
Decrease in other payables	1,103,113	207,583	(1,232,646)
Increase(decrease) in other current liabilities	(30,375)	107,993	127,076
Decrease in other non-current liabilities	(1,015)	(14,915)	(56,319)
Decrease(Increase) in provisions	(22,115)	(4,668)	2,264
Increase(decrease) in deferred revenue	(384)	3,696	(1,948)
Increase in plan assets	(90,771)	(114,631)	(136,336)
Payment of post-employment benefits	(343,931)	(241,350)	(186,520)
Cash generated from operations (1+2+3)	₩ 3,835,879	₩ 5,829,607	₩ 4,745,293

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, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure Of Cash Flows From Operating Activities [Line Items]
Interest income	₩ 271,925	₩ 273,460	₩ 270,571
Interest expenses	293,854	263,389	263,579
Gain loss valuation Of financial assets	44,833	(64,660)	(64,660)
BC Card Co Ltd [Member]
Disclosure Of Cash Flows From Operating Activities [Line Items]
Interest income	68,869	27,440	20,854
Interest expenses	27,060	5,458	1,456
Dividend income	2,299	₩ 1,340	₩ 2,059
KT Estate Inc [Member]
Disclosure Of Cash Flows From Operating Activities [Line Items]
Gains (losses) on disposals of investment properties	95,129
KT Investment Co Ltd [Member]
Disclosure Of Cash Flows From Operating Activities [Line Items]
Gain loss valuation Of financial assets	₩ 7,859

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, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows from (used in) operating activities [abstract]
Reclassification of the current portion of borrowings	₩ 1,004,818	₩ 1,303,543	₩ 1,229,359
Reclassification of construction-in-progress to property and equipment	3,167,965	2,916,888	3,011,519
Reclassification of accounts payable from property and equipment	(7,055)	(149,512)	22,052
Reclassification of accounts payable from intangible assets	(197,389)	524,040	(345,675)
Reclassification of payable from defined benefit liabilities	(32,417)	69,415	72,346
Reclassification of payable from plan assets	28,532	₩ (60,320)	₩ 66,046
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, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure of reconciliation of liabilities arising from financing activities [line items]
Beginning	₩ 9,572,795	₩ 8,582,905	₩ 8,471,738
Cash flows	104,772	504,331	(259,601)
Newly acquired	426,644	458,870	507,472
Exchange difference	18,805	2,882	(12,607)
Fair value change	44,221	(22,053)	(27,085)
Changes in consolidation scope	0	52,834	3,564
Others	(88,737)	(6,974)	(100,576)
Ending	11,021,448	9,572,795	8,582,905
Borrowings [member]
Disclosure of reconciliation of liabilities arising from financing activities [line items]
Beginning	8,437,703	7,316,298	7,298,867
Cash flows	139,132	900,394	167,867
Newly acquired	0	52,782	17,523
Exchange difference	146,108	196,890	(157,985)
Fair value change	939
Changes in consolidation scope	0	15,994
Others	30,614	(44,655)	(9,974)
Ending	10,006,685	8,437,703	7,316,298
Lease liabilities [member]
Disclosure of reconciliation of liabilities arising from financing activities [line items]
Beginning	1,159,369	1,143,640	1,211,351
Cash flows	(378,684)	(394,567)	(447,784)
Newly acquired	427,398	403,451	473,477
Exchange difference	0	3	(3)
Fair value change	0	90	40
Changes in consolidation scope	0	36,840	3,564
Others	(36,045)	(30,088)	(97,005)
Ending	1,172,038	1,159,369	1,143,640
Other Financial Liabilities [Member]
Disclosure of reconciliation of liabilities arising from financing activities [line items]
Cash flows			(13,674)
Newly acquired			13,674
Derivative liabilities [member]
Disclosure of reconciliation of liabilities arising from financing activities [line items]
Beginning	75,176	130,573	20,096
Cash flows	(41,197)	(1,712)	(943)
Newly acquired	0	2,637	2,798
Exchange difference	19,858	(4,311)	142,511
Fair value change	12,941	(4,892)	(23,669)
Changes in consolidation scope	0
Others	(33,223)	(47,119)	(10,220)
Ending	33,555	75,176	130,573
Derivative assets [member]
Disclosure of reconciliation of liabilities arising from financing activities [line items]
Beginning	(99,453)	(7,606)	(58,576)
Cash flows	76,280	216	34,933
Newly acquired	(754)
Exchange difference	(147,161)	(189,700)	2,870
Fair value change	30,341	(17,251)	(3,456)
Changes in consolidation scope	0
Others	(50,083)	114,888	16,623
Ending	₩ (190,830)	₩ (99,453)	₩ (7,606)

Segment Information - Summary o

Segment Information - Summary of Segment Information (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure of operating segments [Line Items]
Operating revenues	₩ 26,234,206	₩ 25,205,659	₩ 24,440,647
Operating income (loss)	1,968,157	1,699,397	1,022,333
Depreciation and Amortization	3,655,879	3,607,638	3,634,284
Operating segments [member]
Disclosure of operating segments [Line Items]
Operating revenues	31,456,833	29,737,242	28,612,918
Operating income (loss)	2,073,417	1,755,230	1,175,170
Depreciation and Amortization	3,852,350	3,712,507	3,718,122
Operating segments [member] | ICT [member]
Disclosure of operating segments [Line Items]
Operating revenues	18,697,269	18,734,342	18,275,765
Operating income (loss)	1,347,405	1,170,920	809,741
Depreciation and Amortization	3,105,807	3,217,643	3,233,878
Operating segments [member] | Finance [member]
Disclosure of operating segments [Line Items]
Operating revenues	3,615,307	3,526,743	3,344,286
Operating income (loss)	119,805	104,511	101,825
Depreciation and Amortization	47,638	46,223	41,693
Operating segments [member] | Satellite TV [member]
Disclosure of operating segments [Line Items]
Operating revenues	709,160	665,081	668,320
Operating income (loss)	19,797	61,398	64,627
Depreciation and Amortization	58,413	60,980	58,181
Operating segments [member] | Real estate [Member]
Disclosure of operating segments [Line Items]
Operating revenues	474,954	336,218	543,587
Operating income (loss)	113,134	27,498	76,431
Depreciation and Amortization	65,457	60,459	56,205
Operating segments [member] | Others [member]
Disclosure of operating segments [Line Items]
Operating revenues	7,960,143	6,474,858	5,780,960
Operating income (loss)	473,276	390,903	122,546
Depreciation and Amortization	575,035	327,202	328,165
Elimination [member]
Disclosure of operating segments [Line Items]
Operating revenues	(5,222,627)	(4,531,583)	(4,172,271)
Operating income (loss)	(105,260)	(55,833)	(152,837)
Depreciation and Amortization	₩ (196,471)	₩ (104,869)	₩ (83,838)

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, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure of geographical areas [Line Items]
Operating revenues	₩ 26,234,206	₩ 25,205,659	₩ 24,440,647
Non-current assets	21,115,704	20,881,181
Domestic [member]
Disclosure of geographical areas [Line Items]
Operating revenues	26,074,349	25,114,719	24,368,729
Non-current assets	20,845,214	20,627,543
Overseas [member]
Disclosure of geographical areas [Line Items]
Operating revenues	159,857	90,940	₩ 71,918
Non-current assets	₩ 270,490	₩ 253,638

Related Party Transactions - Su

Related Party Transactions - Summary of Related Parties Outstanding Balances of Receivables and Payables (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2022	Dec. 31, 2021
Disclosure of transactions between related parties [line items]
Payables	₩ 8,824
Trade receivables [member]
Disclosure of transactions between related parties [line items]
Receviables	4,572	₩ 6,000
Trade receivables [member] | K Bank Inc.[Member]
Disclosure of transactions between related parties [line items]
Receviables	682	821
Trade receivables [member] | IGIS Professional Investors Private Investment Real Estate Investment LLC No.395 [Member]
Disclosure of transactions between related parties [line items]
Receviables		4,614
Trade receivables [member] | Others [member]
Disclosure of transactions between related parties [line items]
Receviables	2,285	565
Trade receivables [member] | Little Big Pictures [Member]
Disclosure of transactions between related parties [line items]
Receviables	1,454
Trade receivables [member] | K-Realty 11th Real Estate Investment Trust Company [Member]
Disclosure of transactions between related parties [line items]
Receviables	151
Trade payables [member]
Disclosure of transactions between related parties [line items]
Payables	3,235
Trade payables [member] | Others [member]
Disclosure of transactions between related parties [line items]
Payables	3,235
Other payables [member]
Disclosure of transactions between related parties [line items]
Payables	3,240	5,342
Other payables [member] | K Bank Inc.[Member]
Disclosure of transactions between related parties [line items]
Payables	299	513
Other payables [member] | Others [member]
Disclosure of transactions between related parties [line items]
Payables	2,932	4,829
Other payables [member] | Little Big Pictures [Member]
Disclosure of transactions between related parties [line items]
Payables	9
Other payables [member] | K-Realty 11th Real Estate Investment Trust Company [Member]
Disclosure of transactions between related parties [line items]
Payables	8,824
Trade Payable [Member]
Disclosure of transactions between related parties [line items]
Payables		343
Trade Payable [Member] | Others [member]
Disclosure of transactions between related parties [line items]
Payables		343
Other Receivables [member]
Disclosure of transactions between related parties [line items]
Receviables	267,929	53,275
Other Receivables [member] | K Bank Inc.[Member]
Disclosure of transactions between related parties [line items]
Receviables	258,999	51,422
Other Receivables [member] | Others [member]
Disclosure of transactions between related parties [line items]
Receviables	2	₩ 1,853
Other Receivables [member] | Little Big Pictures [Member]
Disclosure of transactions between related parties [line items]
Receviables	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

Related Party Transactions - _2

Related Party Transactions - Summary of Significant Transactions with Related Parties (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure of transactions between related parties [line items]
Operating Revenue	₩ 41,925	₩ 296,186	₩ 18,765
Purchases	54,222	37,774	18,499
K-Realty CR-REITs No.1 [member]
Disclosure of transactions between related parties [line items]
Operating Revenue		238,847	2,298
Purchases		1,308
Others [member]
Disclosure of transactions between related parties [line items]
Operating Revenue	11,964	28,092	809
Purchases	37,742	21,302	10,272
K Bank [member]
Disclosure of transactions between related parties [line items]
Operating Revenue	29,536	24,247	15,658
Purchases	11,007	15,164	₩ 8,227
IGIS Professional Investors Private Investment Real Estate Investment LLC No.395 [Member]
Disclosure of transactions between related parties [line items]
Operating Revenue		5,000
Purchases		₩ 0
Hyundai Robotics Co., Ltd [Member]
Disclosure of transactions between related parties [line items]
Operating Revenue	94
Purchases	3,799
Digital Pharm Co., Ltd [Member]
Disclosure of transactions between related parties [line items]
Operating Revenue	1
K-Realty 11th Real Estate Investment Trust Company [Member]
Disclosure of transactions between related parties [line items]
Operating Revenue	330
Purchases	₩ 1,674

Related Party Transactions - _3

Related Party Transactions - Summary of Key Management Compensation (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure of transactions between related parties [abstract]
Salaries and other short-term benefits	₩ 1,855	₩ 2,189	₩ 2,086
Post-employment benefits	294	412	390
Share-based compensation	976	669	625
Total	₩ 3,125	₩ 3,270	₩ 3,101

Related Party Transactions - _4

Related Party Transactions - Summary of Transactions Prior Liquidation (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement [Line Items]
Payables	₩ 8,824
Acquisition of right of use assets [member]
Statement [Line Items]
Dividend Income	1,966
Acquisition of right of use assets [member] | KRealty 11th Real Estate Investment Trust Company [Member]
Statement [Line Items]
Dividend Income	1,966
Interest Expense [member]
Statement [Line Items]
Payables	260	₩ 205	₩ 917
Interest Expense [member] | K-Realty CR-REITs No.1 [member]
Statement [Line Items]
Payables		205	917
Interest Expense [member] | KRealty 11th Real Estate Investment Trust Company [Member]
Statement [Line Items]
Payables	260
Dividend Income [member]
Statement [Line Items]
Dividend Income	54,869	48,779	17,345
Dividend Income [member] | K-Realty CR-REITs No.1 [member]
Statement [Line Items]
Dividend Income	45,549	40,142	8,061
Dividend Income [member] | Others [member]
Statement [Line Items]
Dividend Income	9,158	8,637	43
Dividend Income [member] | Korea Information & Technology Investment Fund (KIF Investment Fund) [member]
Statement [Line Items]
Dividend Income			9,241
Dividend Income [member] | KRealty 11th Real Estate Investment Trust Company [Member]
Statement [Line Items]
Dividend Income	162
Interest income [member]
Statement [Line Items]
Dividend Income	3,052	223	14
Interest income [member] | K Bank Inc.[Member]
Statement [Line Items]
Dividend Income	₩ 3,052		₩ 14
Interest income [member] | Korea Information & Technology Investment Fund (KIF Investment Fund) [member]
Statement [Line Items]
Dividend Income		₩ 223

Related Party Transactions - _5

Related Party Transactions - Summary of Fund Transactions with Related Parties (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure of transactions between related parties [line items]
Equity contributions in cash	₩ 278,138	₩ 462,888	₩ 255,302
Borrowings	31,916
Repayments	771	15,964	20,304
K-Realty CR-REITs No.1 [member]
Disclosure of transactions between related parties [line items]
Repayments		15,964	20,304
Studio Discovery Co Ltd [Member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash			3,000
KT Young Entrepreneurs DNA Investment Fund [Member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash		8,400	3,600
KT-Smart Factory Investment Fund [member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash			2,800
KT-CKP New Media Investment Fund [member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash			(109)
K Bank Inc.[Member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash		424,957	195,011
Gyeonggi-KT Yoojin Superman Fund [member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash			1,000
Hyundai Robotics Co Ltd [Member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash			₩ 50,000
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
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)
Other [member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash	93,478	₩ 18,176
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
KRealty 11th Real Estate Investment Trust Company [Member]
Disclosure of transactions between related parties [line items]
Borrowings	1,916
Repayments	₩ 771

Related Party Transactions - Ad

Related Party Transactions - Additional Information (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2022	Dec. 31, 2021
IBK KT Emerging Digital Industry Investment Fund [Member]
Disclosure of transactions between related parties [line items]
Investment in related party	₩ 53,120
K Bank Inc. [Member]
Disclosure of transactions between related parties [line items]
Credit card contract threshold limit	₩ 1,000	₩ 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, 2022	Dec. 31, 2021	Dec. 31, 2020
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	₩ (5,841)	₩ (3,433)	₩ 25,220
Impact on equity	₩ (15,836)	₩ 8,692	₩ 36,961
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	₩ 5,841	₩ 3,433	₩ (25,220)
Impact on equity	₩ 15,836	₩ (8,692)	₩ (36,961)
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	₩ 2,660	₩ 2,000	₩ 2,811
Impact on equity	₩ 113,948	₩ 4,588	₩ 3,472
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	₩ (2,660)	₩ (2,000)	₩ (2,811)
Impact on equity	₩ (113,948)	₩ (4,588)	₩ (3,472)
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	₩ 635	₩ 753	₩ 973
Impact on equity	₩ (2,045)	₩ 5,549	₩ 18,584
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	₩ (669)	₩ (731)	₩ (973)
Impact on equity	₩ 2,100	₩ (5,675)	₩ (19,377)

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, ¥ in Thousands, £ in Thousands, zł in Thousands, XDR in Thousands, XAF in Thousands, Tsh in Thousands, SFr in Thousands, P in Thousands, FRw in Thousands, $ in Thousands, $ in Thousands, $ in Thousands, $ in Thousands, ₩ in Millions, лв in Millions, RM in Millions

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)

Dec. 31, 2021 KRW (₩)

Dec. 31, 2020 USD ($)

Dec. 31, 2020 XDR

Dec. 31, 2020 JPY (¥)

Dec. 31, 2020 EUR (€)

Dec. 31, 2020 CNY (¥)

Dec. 31, 2020 RWF (FRw)

Dec. 31, 2020 THB (฿)

Dec. 31, 2020 TZS (Tsh)

Dec. 31, 2020 BWP (P)

Dec. 31, 2020 HKD ($)

Dec. 31, 2020 PLN (zł)

Dec. 31, 2020 VND (₫)

Dec. 31, 2020 XAF

Dec. 31, 2020 SGD ($)

Disclosure of detailed information about financial instruments [line items]

Financial assets

₩ 13,766,638

₩ 11,129,720

Financial liabilities

₩ 18,825,390

₩ 16,915,572

Currency risk [Member]

Disclosure of detailed information about financial instruments [line items]

Financial assets

$ 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

$ 400,046

XDR 255

¥ 209,376

€ 316

¥ 458

FRw 646

฿ 535

Tsh 1,019

P 212

zł 26

₫ 242,370

XAF 16,229

$ 6

Financial liabilities

$ 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

$ 1,937,935

XDR 728

¥ 46,000,009

€ 162

¥ 491

$ 198

$ 284,000

Financial Risk Management - S_3

Financial Risk Management - Summary of Maximum Exposure to Credit Risk (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2022	Dec. 31, 2021
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk	₩ 13,027,594	₩ 11,578,687
Cash and cash equivalents (except for cash on hand) [member]
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk	2,437,629	2,989,713
Financial assets at amortized costs [member]
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk	7,459,994	5,687,103
Financial assets at fair value through other comprehensive income [member]
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk	129,124	491,713
Contract assets [member]
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk	802,253	745,085
Derivatives financial assets for hedging [member]
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk	190,830	99,453
Financial assets at fair value through profit or loss [member]
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk	942,274	862,481
Financial assets at fair value through other comprehensive income [member]
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk	5,432	94,750
Financial assets at amortized costs [member]
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk	₩ 1,060,058	₩ 608,389

Financial Risk Management - S_4

Financial Risk Management - Summary of Contractual Undiscounted Cash Flows (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2022	Dec. 31, 2021
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]
Trade and other payables	₩ 8,483,110	₩ 8,090,898
Borrowings(including debentures)	11,016,756	9,838,571
Lease liabilities	1,336,761	1,300,562
Other non-derivative financial liabilities	336,178	309,122
Financial guarantee contracts	26,206	71,697
Total	21,199,011	19,610,850
Less than 1 year [member]
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]
Trade and other payables	7,386,703	6,698,783
Borrowings(including debentures)	2,028,207	1,927,456
Lease liabilities	313,162	388,226
Other non-derivative financial liabilities	33,279	1,473
Financial guarantee contracts	21,618	71,697
Total	9,782,969	9,087,635
1-5 years [member]
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]
Trade and other payables	1,009,559	1,232,468
Borrowings(including debentures)	6,972,077	5,635,558
Lease liabilities	615,766	484,476
Other non-derivative financial liabilities	209,155	206,749
Financial guarantee contracts
Total	8,806,557	7,559,251
More than 5 years [member]
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]
Trade and other payables	86,848	159,647
Borrowings(including debentures)	2,016,472	2,275,557
Lease liabilities	407,833	427,860
Other non-derivative financial liabilities	93,744	100,900
Financial guarantee contracts	4,588
Total	₩ 2,609,485	₩ 2,963,964

Financial Risk Management - S_5

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, 2022	Dec. 31, 2021	Dec. 31, 2020
Derivatives held for trading
Outflows	₩ 102,924	₩ 158,284
Derivatives settled gross
Outflow	2,994,649	3,078,733	₩ 2,925,965
Inflow	3,258,353	3,167,878	2,804,618
Less than 1 year [member]
Derivatives held for trading
Outflows	0	0
Derivatives settled gross
Outflow	472,005	843,489	248,300
Inflow	550,478	856,508	249,301
1-5 years [member]
Derivatives held for trading
Outflows	101,994	158,284
Derivatives settled gross
Outflow	2,493,858	1,857,942	2,179,046
Inflow	2,670,002	1,917,236	2,074,747
More than 5 years [member]
Derivatives held for trading
Outflows	930	0
Derivatives settled gross
Outflow	28,786	377,302	498,619
Inflow	₩ 37,873	₩ 394,134	₩ 480,570

Financial Risk Management - S_6

Financial Risk Management - Summary of Debt-to-equity Ratios (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disclosure of detailed information about financial instruments [abstract]
Total liabilities	₩ 22,577,114	₩ 20,592,180
Total equity	₩ 18,412,696	₩ 16,567,161	₩ 15,551,433	₩ 15,140,684
Debt-to-equity ratio	123%	124%

Financial Risk Management - S_7

Financial Risk Management - Summary of Gearing Ratios (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disclosure of detailed information about financial instruments [abstract]
Total borrowings	₩ 10,006,685	₩ 8,437,703
Less: cash and cash equivalents	(2,449,062)	(3,019,592)	₩ (2,634,624)	₩ (2,305,894)
Net debt	7,557,623	5,418,111
Total equity	18,412,696	16,567,161	₩ 15,551,433	₩ 15,140,684
Total capital	₩ 25,970,319	₩ 21,985,272
Gearing ratio	29%	25%

Financial Risk Management - S_8

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, 2022	Dec. 31, 2021
Disclosure of offsetting of financial assets [line items]
Gross assets	₩ 61,276
Gross liabilities offset	(764)
Net amounts presented in the statement of financial position	65,012
Amounts not offset, Financial instruments	(44,518)
Net amount	15,994
Trade receivables [member]
Disclosure of offsetting of financial assets [line items]
Gross assets	60,512	₩ 79,102
Net amounts presented in the statement of financial position	60,512	79,102
Amounts not offset, Financial instruments	(44,518)	(65,592)
Net amount	15,994	₩ 13,510
Other financial assets [Member]
Disclosure of offsetting of financial assets [line items]
Gross assets	764
Gross liabilities offset	₩ (764)

Financial Risk Management - S_9

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, 2022	Dec. 31, 2021
Disclosure of offsetting of financial liabilities [Line Items]
Gross liabilities	₩ 47,271	₩ 69,944
Gross assets offset	(764)
Net amounts presented in the statement of financial position	46,507	69,955
Amounts not offset, Financial instruments	(44,518)	(65,592)
Net amount	1,989	4,352
Trade payables [member]
Disclosure of offsetting of financial liabilities [Line Items]
Gross liabilities	47,271	69,944
Gross assets offset	(764)
Net amounts presented in the statement of financial position	46,507	69,944
Amounts not offset, Financial instruments	(44,518)	(65,592)
Net amount	₩ 1,989	₩ 4,352

Financial Risk Management - Add

Financial Risk Management - Additional Information (Detail) $ in Thousands, ₩ in Millions	Dec. 31, 2022 KRW (₩)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 KRW (₩)
Disclosure of detailed information about financial instruments [line items]
Amounts payable, related party transactions	₩ 8,824
Maximum exposure to credit risk	13,027,594		₩ 11,578,687
Financial guarantee contracts [member]
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk	26,206		₩ 71,697
IBK KT Emerging Digital Industry Investment Fund [Member]
Disclosure of detailed information about financial instruments [line items]
Investment In Related Party	53,120
Future Innovation Private Equity Fund No.3 [Member]
Disclosure of detailed information about financial instruments [line items]
Amounts payable, related party transactions	₩ 5,473	$ 34,050

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, 2022	Dec. 31, 2021
Disclosure of detailed information about financial instruments [line items]
Financial assets	₩ 13,766,638	₩ 11,129,720
Financial liabilities	18,825,390	16,915,572
Trade and other payables [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	8,397,264	7,980,203
Borrowings [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	10,006,685	8,437,703
Financial Liabilities At Amortized Costs [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	246,606	263,500
Financial liabilities designated as at fair value through profit or loss [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	141,280	216,040
Derivative financial liabilities for hedging [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	33,555	18,126
Cash and cash equivalents [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	2,449,062	3,019,592
Financial assets at amortized costs [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	7,364,516	5,610,377
Financial assets at fair value through other comprehensive income [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	129,124	491,713
Other financial assets at amortized costs [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	1,060,058	608,389
Financial assets at fair value through profit or loss [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	1,064,856	952,319
Other financial assets at fair value through other comprehensive income [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	1,508,192	347,877
Derivative financial assets for hedging purpose [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	190,830	99,453
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	9,405,992	8,578,827
Fair value [member] | Financial Liabilities At Amortized Costs [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	1	1
Fair value [member] | Financial liabilities designated as at fair value through profit or loss [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	141,280	216,040
Fair value [member] | Derivative financial liabilities for hedging [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	33,555	18,126
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	129,124	491,713
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	1,064,856	952,319
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	1,508,192	347,877
Fair value [member] | Derivative financial assets for hedging purpose [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	₩ 190,830	₩ 99,453

Fair Value - Summary of Fair Va

Fair Value - Summary of Fair Value Non of Financial Instruments (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2022	Dec. 31, 2021
Disclosure of detailed information about financial instruments [line items]
Non financial assets	₩ 8,263,049	₩ 6,154,743
Non financial liabilities	9,580,827	8,812,993
Level 1 [Member]
Disclosure of detailed information about financial instruments [line items]
Non financial assets	1,032,547	41,613
Level 2 [Member]
Disclosure of detailed information about financial instruments [line items]
Non financial assets	750,144	917,726
Non financial liabilities	9,439,547	8,597,661
Level 3 [Member]
Disclosure of detailed information about financial instruments [line items]
Non financial assets	6,480,358	5,195,404
Non financial liabilities	141,280	215,332
Financial assets at fair value through other comprehensive income [member]
Disclosure of detailed information about financial instruments [line items]
Non financial assets	129,124	491,713
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	129,124	491,713
Financial assets at fair value through profit or loss [member]
Disclosure of detailed information about financial instruments [line items]
Non financial assets	1,064,856	952,319
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	26,647	24,285
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	426,140	350,949
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	612,069	577,085
Other financial assets at fair value through other comprehensive income [member]
Disclosure of detailed information about financial instruments [line items]
Non financial assets	1,508,192	347,877
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	1,005,900	17,328
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	5,163	7,176
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	497,129	323,373
Derivative financial assets for hedging [member]
Disclosure of detailed information about financial instruments [line items]
Non financial assets	190,830	99,453
Derivative financial assets for hedging [member] | Level 2 [Member]
Disclosure of detailed information about financial instruments [line items]
Non financial assets	189,717	67,888
Derivative financial assets for hedging [member] | Level 3 [Member]
Disclosure of detailed information about financial instruments [line items]
Non financial assets	1,113	31,565
Investment Properties [member]
Disclosure of detailed information about financial instruments [line items]
Non financial assets	5,370,047	4,263,381
Investment Properties [member] | Level 3 [Member]
Disclosure of detailed information about financial instruments [line items]
Non financial assets	5,370,047	4,263,381
Borrowings [Member]
Disclosure of detailed information about financial instruments [line items]
Non financial liabilities	9,405,992	8,578,827
Borrowings [Member] | Level 2 [Member]
Disclosure of detailed information about financial instruments [line items]
Non financial liabilities	9,405,992	8,578,827
Other financial liabilities at fair value through profit or loss [member]
Disclosure of detailed information about financial instruments [line items]
Non financial liabilities	141,280	216,040
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	0	708
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	141,280	215,332
Derivative financial liabilities for hedging [member]
Disclosure of detailed information about financial instruments [line items]
Non financial liabilities	33,555	18,126
Derivative financial liabilities for hedging [member] | Level 2 [Member]
Disclosure of detailed information about financial instruments [line items]
Non financial liabilities	₩ 33,555	₩ 18,126

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, 2022	Dec. 31, 2021
Disclosure of detailed information about financial instruments [line items]
Beginning balance	₩ 11,129,720
Ending balance	13,766,638	₩ 11,129,720
Beginning balance	16,915,572
Ending balance	18,825,390	16,915,572
Financial assets at fair value through profit or loss [member]
Disclosure of detailed information about financial instruments [line items]
Beginning balance	952,319
Ending balance	1,064,856	952,319
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	31,565	(4,194)
Disposal	(31,565)	0
Amount recognized in profit or loss	0	43,150
Amount recognized in other comprehensive income	1,113	(7,391)
Ending balance	1,113	31,565
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	215,332	2,637
Purchases	3,046	205,323
Reclassification	(54,921)
Changes in consolidation scope	0	46,208
Amount recognized in profit or loss	(22,177)	(38,836)
Ending balance	141,280	215,332
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	577,085	432,509
Purchases	226,310	492,842
Reclassification	(8,962)	(25,757)
Changes in scope of consolidation	0	353
Disposal	(179,740)	(418,029)
Amount recognized in profit or loss	(2,624)	95,167
Ending balance	612,069	577,085
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	323,373	50,789
Purchases	262,408	118,648
Reclassification	8,122	14,633
Changes in scope of consolidation	(40)	(3,051)
Disposal	(97,426)	(5,325)
Amount recognized in profit or loss	18	71
Amount recognized in other comprehensive income	674	147,608
Ending balance	₩ 497,129	₩ 323,373

Fair Value - Summary of Valuati

Fair Value - Summary of Valuation Techniques and Inputs (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Assets
Financial assets at fair value through other comprehensive income	₩ 1,508,192	₩ 347,877
Other financial assets
Financial assets at fair value through profit or loss	1,064,856	952,319
Derivative financial assets for hedging	190,830	99,453
Investment properties	1,933,358	1,720,654	₩ 1,368,453
Liabilities
Borrowing	10,006,685	8,437,703
Other financial liabilities
Financial liabilities at fair value through profit or loss	141,280	216,040
Derivative financial liabilities for hedging	33,555	18,126
Level 2 [Member]
Liabilities
Borrowing	₩ 9,405,992	₩ 8,578,827
Other financial liabilities
Valuation techniques	DCF Model	DCF Model
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	₩ 33,555	₩ 18,126
Valuation techniques	DCF Model	DCF Model
Description of inputs used in fair value measurement, liabilities	Market observationdiscount 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	₩ 129,124	₩ 491,713
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	₩ 99,453
Other financial liabilities
Valuation techniques	Hull-White Model, DCF Model	Hull-White Model,DCF Model
Description of inputs used in fair value measurement, assets	Market observation discount rate, Swap interest rate	Market observation discount 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	₩ 141,280	₩ 216,040
Valuation techniques	DCF Model, Binomial Option Pricing Model, Monte-Carlo Simulation	DCF Model, Binomial Option Pricing Model
Description of inputs used in fair value measurement, liabilities		Forward rate, Market 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	₩ 1,038,209	₩ 928,034
Other financial liabilities
Valuation techniques	DCF Model, Adjusted Net Asset Model,Monte-Carlo Simulation	DCF Model, Adjusted Net Asset Model
Description of inputs used in fair value measurement, assets	Market Interest rate, Underlying asset price	Bond 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	₩ 502,292	₩ 330,549
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	₩ 5,370,047	₩ 4,263,381
Other financial liabilities
Valuation techniques	DCF Model	DCF Model

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, 2022	Dec. 31, 2021
Disclosure of detailed information about financial instruments [line items]
Beginning balance	₩ 11,129,720
Recognized at fair value through profit or loss	(1,064,856)	₩ (952,319)
Ending balance	13,766,638	11,129,720
Beginning balance	16,915,572
Recognized at fair value through profit or loss	141,280	216,040
Ending balance	18,825,390	16,915,572
Derivatives held for trading [member]
Disclosure of detailed information about financial instruments [line items]
Beginning balance	0	0
New transactions	0	0
Recognized at fair value through profit or loss	0	0
Ending balance	0	0
Derivatives used for hedging [member]
Disclosure of detailed information about financial instruments [line items]
Beginning balance	832	2,257
New transactions	0	0
Recognized at fair value through profit or loss	(832)	(1,425)
Ending balance	₩ 0	₩ 832

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, 2022	Dec. 31, 2021
Disclosure of unconsolidated structured entities [line items]
Other financial assets	₩ 3,823,936	₩ 2,008,038
Joint ventures and associates	1,480,722	1,288,429
Real Estate Finance [member]
Disclosure of unconsolidated structured entities [line items]
Total assets of unconsolidated structured entities	3,539,827	2,343,487
Other financial assets	77,819	40,587
Joint ventures and associates	123,138	125,009
Total	200,957	165,596
Maximum loss exposure Investment assets	200,957	165,596
Cash deficiency support	40,914
Total	241,871	165,596
PEF &Investment Fund [member]
Disclosure of unconsolidated structured entities [line items]
Total assets of unconsolidated structured entities	5,580,445	5,202,439
Other financial assets	237,907	237,841
Joint ventures and associates	268,275	246,440
Total	506,182	484,281
Maximum loss exposure Investment assets	506,182	484,281
Cash deficiency support	91,224	63,489
Total	597,406	547,770
Asset Securitization [member]
Disclosure of unconsolidated structured entities [line items]
Total assets of unconsolidated structured entities	2,044,989	2,256,256
Unconsolidated structured entities [member]
Disclosure of unconsolidated structured entities [line items]
Total assets of unconsolidated structured entities	11,165,261	9,802,182
Other financial assets	315,726	278,428
Joint ventures and associates	391,413	371,449
Total	707,139	649,877
Maximum loss exposure Investment assets	707,139	649,877
Cash deficiency support	132,138	63,489
Total	₩ 839,277	₩ 713,366

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, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure of subsidiaries [line items]
Accumulated non-controlling interests at the beginning of the year	₩ 1,590,625
Profit or loss allocated to non-controlling interests	125,165	₩ 102,517	₩ 45,367
Accumulated non-controlling interests at the end of the year	₩ 1,802,551	₩ 1,590,625
KT Skylife Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Non-controlling Interests rate(%)	49.80%	49.70%	49.70%
Accumulated non-controlling interests at the beginning of the year	₩ 410,695	₩ 388,900	₩ 375,906
Profit or loss allocated to non-controlling interests	7,127	24,795	22,171
Dividends paid to non-controlling interests	(8,284)	(8,279)	(8,279)
Others	13,651	5,279	(898)
Accumulated non-controlling interests at the end of the year	₩ 423,189	₩ 410,695	₩ 388,900
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	₩ 498,928	₩ 411,826	₩ 417,475
Profit or loss allocated to non-controlling interests	47,909	34,496	9,899
Dividends paid to non-controlling interests	(7,641)	(6,434)	(22,787)
Others	(14,539)	59,040	7,239
Accumulated non-controlling interests at the end of the year	₩ 524,657	498,928	₩ 411,826
KT Powertel Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Non-controlling Interests rate(%)			55.20%
Accumulated non-controlling interests at the beginning of the year		55,747	₩ 54,276
Profit or loss allocated to non-controlling interests			2,151
Dividends paid to non-controlling interests			(478)
Others			(202)
Accumulated non-controlling interests at the end of the year			₩ 55,747
KT Alpha Co., Ltd. (KT Hitel Co., Ltd.)
Disclosure of subsidiaries [line items]
Non-controlling Interests rate(%)			32.90%
Accumulated non-controlling interests at the beginning of the year		50,306	₩ 54,709
Profit or loss allocated to non-controlling interests			(1,840)
Others			(2,563)
Accumulated non-controlling interests at the end of the year			₩ 50,306
KT Telecop Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Non-controlling Interests rate(%)			13.20%
Accumulated non-controlling interests at the beginning of the year		₩ 3,594	₩ 3,650
Profit or loss allocated to non-controlling interests			152
Others			(208)
Accumulated non-controlling interests at the end of the year			3,594
KTIS Corporation [Member]
Disclosure of subsidiaries [line items]
Non-controlling Interests rate(%)	66.70%	68.60%
Accumulated non-controlling interests at the beginning of the year	₩ 135,240	₩ 120,071
Profit or loss allocated to non-controlling interests	14,965	17,715
Dividends paid to non-controlling interests	(2,226)	(1,837)
Others	(6,577)	(709)
Accumulated non-controlling interests at the end of the year	₩ 141,402	₩ 135,240	120,071
KTCS Corporation [Member]
Disclosure of subsidiaries [line items]
Non-controlling Interests rate(%)	78.30%	79.70%
Accumulated non-controlling interests at the beginning of the year	₩ 145,111	₩ 129,502
Profit or loss allocated to non-controlling interests	18,888	21,394
Dividends paid to non-controlling interests	(2,721)	(2,211)
Others	(7,397)	(3,574)
Accumulated non-controlling interests at the end of the year	₩ 153,881	₩ 145,111	129,502
Nasmedia Co., Ltd [Member]
Disclosure of subsidiaries [line items]
Non-controlling Interests rate(%)	56%	56%
Accumulated non-controlling interests at the beginning of the year	₩ 124,181	₩ 112,549
Profit or loss allocated to non-controlling interests	15,610	15,185
Dividends paid to non-controlling interests	(4,187)	(3,808)
Others	(179)	255
Accumulated non-controlling interests at the end of the year	₩ 135,425	₩ 124,181	₩ 112,549

Information About Non-control_4

Information About Non-controlling Interests - Summary of Financial Information on Subsidiaries (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disclosure of subsidiaries [line items]
Current assets	₩ 12,690,014	₩ 11,858,350
Non-current assets	28,299,796	25,300,991
Current liabilities	10,699,268	10,072,432
Non-current liabilities	11,877,846	10,519,748
Equity	18,412,696	16,567,161	₩ 15,551,433	₩ 15,140,684
Operating revenue	25,638,855	24,898,005	24,099,394
Profit or loss for the year	1,385,635	1,459,395	746,256
Total comprehensive income	1,383,441	1,624,962	769,511
Cash flows from operating activities	3,597,065	5,561,834	4,739,827
Cash flows from investing activities	(4,838,643)	(5,137,474)	(3,761,470)
Cash flows from financing activities	669,331	(41,282)	(647,585)
Net increase (decrease) in cash and cash equivalents	(570,530)	384,968	328,730
Cash and cash equivalents at beginning of year	3,019,592	2,634,624	2,305,894
Exchange differences	1,717	1,890	(2,042)
Cash and cash equivalents at end of year	₩ 2,449,062	₩ 3,019,592	₩ 2,634,624
KT Skylife Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Non-controlling Interests rate (%)	49.80%	49.70%	49.70%
Current assets	₩ 420,701	₩ 408,484	₩ 480,450
Non-current assets	938,465	867,161	439,026
Current liabilities	274,637	249,676	153,236
Non-current liabilities	229,042	220,018	21,803
Equity	855,487	805,951	744,437
Operating revenue	1,038,468	772,950	706,631
Profit or loss for the year	20,941	62,309	58,190
Total comprehensive income	34,485	74,995	55,647
Cash flows from operating activities	176,407	102,947	160,934
Cash flows from investing activities	(78,928)	(352,116)	(105,293)
Cash flows from financing activities	(79,455)	230,010	(19,650)
Net increase (decrease) in cash and cash equivalents	18,024	(19,159)	35,991
Cash and cash equivalents at beginning of year	80,672	99,834	63,850
Exchange differences	(1)	(3)	(7)
Cash and cash equivalents at end of year	₩ 98,695	₩ 80,672	₩ 99,834
BC Card Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Non-controlling Interests rate (%)	30.50%	30.50%	30.50%
Current assets	₩ 3,152,622	₩ 1,991,152	₩ 1,785,914
Non-current assets	2,513,453	1,942,275	1,298,484
Current liabilities	2,879,551	1,658,476	1,602,667
Non-current liabilities	1,229,649	822,528	176,083
Equity	1,556,875	1,452,423	1,305,648
Operating revenue	3,897,090	3,580,970	3,387,640
Profit or loss for the year	148,341	120,308	39,455
Total comprehensive income	143,055	122,578	61,796
Cash flows from operating activities	(798,043)	(157,645)	(119,163)
Cash flows from investing activities	(7,733)	(283,313)	58,042
Cash flows from financing activities	914,441	526,563	22,790
Net increase (decrease) in cash and cash equivalents	108,665	85,605	(38,331)
Cash and cash equivalents at beginning of year	326,482	240,584	279,162
Exchange differences	(100)	293	(247)
Cash and cash equivalents at end of year	₩ 435,047	326,482	₩ 240,584
KT Powertel Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Non-controlling Interests rate (%)			55.20%
Current assets			₩ 90,056
Non-current assets			29,638
Current liabilities			17,045
Non-current liabilities			1,788
Equity			100,861
Operating revenue			65,897
Profit or loss for the year			3,809
Total comprehensive income			3,442
Cash flows from operating activities			6,011
Cash flows from investing activities			(3,353)
Cash flows from financing activities			(1,515)
Net increase (decrease) in cash and cash equivalents			1,143
Cash and cash equivalents at beginning of year		7,360	6,217
Exchange differences			0
Cash and cash equivalents at end of year			₩ 7,360
KT Alpha Co., Ltd. (KT Hitel Co., Ltd.)
Disclosure of subsidiaries [line items]
Non-controlling Interests rate (%)			32.90%
Current assets			₩ 140,948
Non-current assets			148,001
Current liabilities			74,045
Non-current liabilities			18,554
Equity			196,350
Operating revenue			350,231
Profit or loss for the year			2,080
Total comprehensive income			(8,700)
Cash flows from operating activities			62,521
Cash flows from investing activities			(58,186)
Cash flows from financing activities			(1,856)
Net increase (decrease) in cash and cash equivalents			2,479
Cash and cash equivalents at beginning of year		₩ 39,439	37,043
Exchange differences			(83)
Cash and cash equivalents at end of year			39,439
KTIS Corporation [Member]
Disclosure of subsidiaries [line items]
Non-controlling Interests rate (%)	66.70%	68.60%
Current assets	₩ 102,121	₩ 124,420
Non-current assets	294,087	244,941
Current liabilities	103,698	103,927
Non-current liabilities	95,506	73,691
Equity	197,004	191,743
Operating revenue	536,229	487,801	454,172
Profit or loss for the year	15,917	24,944	7,387
Total comprehensive income	13,502	28,669
Cash flows from operating activities	13,809	49,011
Cash flows from investing activities	9,813	(27,143)
Cash flows from financing activities	(29,199)	(23,126)
Net increase (decrease) in cash and cash equivalents	(5,577)	(1,258)
Cash and cash equivalents at beginning of year	30,521	31,779
Exchange differences	0	0
Cash and cash equivalents at end of year	₩ 24,944	₩ 30,521	31,779
KTCS Corporation [Member]
Disclosure of subsidiaries [line items]
Non-controlling Interests rate (%)	78.30%	79.70%
Current assets	₩ 296,209	₩ 302,953
Non-current assets	123,517	113,797
Current liabilities	188,379	189,641
Non-current liabilities	40,240	44,530
Equity	191,107	182,579
Operating revenue	1,031,010	968,499	933,006
Profit or loss for the year	17,634	19,034	11,323
Total comprehensive income	17,500	16,914
Cash flows from operating activities	19,423	6,945
Cash flows from investing activities	13,245	(1,039)
Cash flows from financing activities	(35,578)	(16,622)
Net increase (decrease) in cash and cash equivalents	(2,910)	(10,716)
Cash and cash equivalents at beginning of year	63,884	75,440
Exchange differences	840	(840)
Cash and cash equivalents at end of year	₩ 61,814	₩ 63,884	75,440
Nasmedia Co., Ltd [Member]
Disclosure of subsidiaries [line items]
Non-controlling Interests rate (%)	56%	56%
Current assets	₩ 435,359	₩ 409,345
Non-current assets	81,586	81,049
Current liabilities	261,381	248,648
Non-current liabilities	14,349	19,970
Equity	241,215	221,776
Operating revenue	153,210	125,876
Profit or loss for the year	27,691	27,120
Total comprehensive income	26,996	27,991
Cash flows from operating activities	22,015	44,500
Cash flows from investing activities	3,845	(16,966)
Cash flows from financing activities	(11,136)	(9,843)
Net increase (decrease) in cash and cash equivalents	14,724	17,691
Cash and cash equivalents at beginning of year	71,396	53,720
Exchange differences	13	(15)
Cash and cash equivalents at end of year	₩ 86,133	₩ 71,396	₩ 53,720

Information About Non-control_5

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, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure of subsidiaries [abstract]
Carrying amount of non-controlling interests acquired	₩ 19,272	₩ 14,702	₩ 1,750
Consideration paid to non-controlling interests	69,652	1,095	9,878
Effect of changes in equity (net amount)	₩ 88,924	₩ 15,797	₩ 11,628

Business Combination - Addition

Business Combination - Additional Information (Detail) - Spark and Associates Inc. [Member] ₩ in Millions	Sep. 30, 2021 KRW (₩) shares
Disclosure of detailed information about business combination [Line Items]
Percentage of ownership interest	(100.00%)
Number of shares acquired | shares	100,000
Number of Shares Acquired Value | ₩	₩ 20,328

Business Combination - Summary

Business Combination - Summary of Business Combination (Detail) - Spark and Associates Inc. [Member] ₩ in Millions	12 Months Ended
	Dec. 31, 2022 KRW (₩)
Disclosure of detailed information about business combination [Line Items]
Date	Oct. 04, 2022
Purchase consideration	₩ 20,328

Business Combination - Schedule

Business Combination - Schedule of Values of Assets and Liabilities Acquired on the Acquisition Date from Major Business Combinations (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
II. Amount recognized as identifiable assets and liabilities
Cash and cash equivalent	₩ 2,449,062	₩ 3,019,592	₩ 2,634,624	₩ 2,305,894
Spark and Associates Inc. [Member]
Disclosure of detailed information about business combination [line items]
I. Total transfer price (A)	20,328
II. Amount recognized as identifiable assets and liabilities
Fair value of identifiable assets	11,446
Cash and cash equivalent	427
Trade and other receivables, net	1,039
Property and equipment, net	23
Intangible assets, net	9,715
Other assets	242
Fair value of identifiable liabilities	2,793
Trade and other payables	410
Current income tax liabilities	32
Net defined benefit liabilities	21
Other liabilities	2,330
Total identifiable net assets (B)	8,653
III. Non-controlling interest (C)	0
IV. Fair value of net assets acquired (D=B-C)	8,653
V. Goodwill (E=A-D)	₩ 11,675

Business Combination - Schedu_2

Business Combination - Schedule of Intangible Assets Additionally Identified By The Group As A Result Of Major Business Combinations For The Year (Detail) - Spark and Associates Inc. [Member] ₩ in Millions	Dec. 31, 2022 KRW (₩)
Disclosure Of Intangible Assets Additionally Identified By The Group As A Result Of Major Business Combinations [Line Items]
Goodwill	₩ 11,675
Customer relationship	₩ 9,715

Business Combination - Summar_2

Business Combination - Summary of Operating Income And Net Profit And Loss Before Elimination Of Intercompany Transactions Of The Acquired Companies (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure of Business Combination Operating Income And Net Profit Loss Before Elimination Of Inter Company Transaction Detailed Information Explanatory [Line Items]
Operating revenue	₩ 25,638,855	₩ 24,898,005	₩ 24,099,394
Profit (loss) for the year	1,385,635	₩ 1,459,395	₩ 746,256
SPARK AND ASSOCIATES INC. [Member]
Disclosure of Business Combination Operating Income And Net Profit Loss Before Elimination Of Inter Company Transaction Detailed Information Explanatory [Line Items]
Operating revenue	6,856
Profit (loss) for the year	670
SPARK AND ASSOCIATES INC. [Member] | After Business Combination [Member]
Disclosure of Business Combination Operating Income And Net Profit Loss Before Elimination Of Inter Company Transaction Detailed Information Explanatory [Line Items]
Operating revenue	1,637
Profit (loss) for the year	₩ 413

Events after Reporting Period -

Events after Reporting Period - Summary of Public Bonds Issued After Reporting Period (Detail) ₩ in Millions	12 Months Ended
	Dec. 31, 2022 KRW (₩)
Disclosure of non-adjusting events after reporting period [line items]
Interest rate	0%
Gross carrying amount [member] | The 198-1st Public bond
Disclosure of non-adjusting events after reporting period [line items]
Issue date	Jan. 12, 2023
Carrying amount	₩ 70,000
Interest rate	3.847%
Redemption date	Jan. 10, 2025
Gross carrying amount [member] | The 198-2nd Public bond
Disclosure of non-adjusting events after reporting period [line items]
Issue date	Jan. 12, 2023
Carrying amount	₩ 150,000
Interest rate	3.869%
Redemption date	Jan. 12, 2026
Gross carrying amount [member] | The 198-3rd Public bond
Disclosure of non-adjusting events after reporting period [line items]
Issue date	Jan. 12, 2023
Carrying amount	₩ 80,000
Interest rate	3.971%
Redemption date	Jan. 12, 2028

Events After Reporting Period_2

Events After Reporting Period - Additional Information (Detail) - KRW (₩) ₩ in Millions		12 Months Ended
	Feb. 09, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure of non-adjusting events after reporting period [line items]
Purchase of treasury shares	₩ 300,000	₩ (763,081)	₩ 190,105	₩ 110,097
Treasury shares	₩ 100,000	₩ 202,295	₩ 1,009,798