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Deferred Income Tax and income Tax Expense (Tables)
 12 Months Ended
Dec. 31, 2025
Deferred tax assets and liabilities [abstract]  
Schedule of Analysis of Deferred Tax Assets and Deferred Tax Liabilities The analysis of deferred tax assets and deferred tax liabilities as at December 31, 2024 and 2025, is as follows:
(in millions of Korean won)December 31,
2024		December 31,
2025
Deferred tax assets
Deferred tax assets to be recovered within 12 months₩417,425 ₩491,258 
Deferred tax assets to be recovered after more than 12 months1,976,377 2,111,630 
Deferred tax assets before offsetting2,393,802 2,602,888 
Deferred tax liabilities
Deferred tax liabilities to be recovered within 12 months(748,888)(841,568)
Deferred tax liabilities to be recovered after more than 12 months(1,884,962)(2,239,787)
Deferred tax liabilities before offsetting(2,633,850)(3,081,355)
Deferred tax assets after offsetting₩679,948 ₩672,957 
Deferred tax liabilities after offsetting₩919,996 ₩1,151,424 
Schedule 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)2024
BeginningStatement of
profit or loss		Other
comprehensive
income		Ending
Deferred tax liabilities
Investments in subsidiaries, associates and joint ventures(270,230)730 (1,194)(270,694)
Depreciation and impairment loss(112,124)9,797 — (102,327)
Plan assets(533,707)71,001 590 (462,116)
Advanced depreciation provision(518,080)(5,128)— (523,208)
Contract assets(421,824)4,301 — (417,523)
Financial assets at fair value through profit or loss84 7,233 — 7,317 
Financial assets at fair value through other comprehensive income(102,627)14,656 (1,932)(89,903)
Others(649,655)(113,707)(12,034)(775,396)
Total₩(2,608,163)₩(11,117)₩(14,570)₩(2,633,850)
Deferred tax assets
Depreciation and impairment loss116,746 (10,711)— 106,035 
Contract liabilities111,978 (2,429)— 109,549 
Defined benefit liabilities515,991 (66,182)42,110 491,919 
Provisions146,171 20,394 — 166,565 
Others1,208,177 165,310 1,631 1,375,118 
Total₩2,099,063 ₩106,382 ₩43,741 ₩2,249,186 
Temporary difference, net(509,100)95,265 29,171 (384,664)
Tax credit carryforwards129,270 15,344 — 144,614 
Total net balance₩(379,830)₩110,609 ₩29,171 ₩(240,050)
(in millions of Korean won)2025
BeginningStatement of
profit or loss		Other
comprehensive
income		Ending
Deferred tax liabilities
Investments in subsidiaries, associates and joint ventures(270,694)(16,796)3,248 (284,242)
Depreciation and impairment loss(102,327)39,469 — (62,858)
Plan assets(462,116)(64,681)1,488 (525,309)
Advanced depreciation provision(523,208)63,719 — (459,489)
Contract assets(417,523)(177,099)— (594,622)
Financial assets at fair value through profit or loss7,317 341 — 7,658 
Financial assets at fair value through other comprehensive income(89,903)14,326 (169,101)(244,678)
Others(775,396)(141,741)(678)(917,815)
Total₩(2,633,850)₩(282,462)₩(165,043)₩(3,081,355)
Deferred tax assets
Depreciation and impairment loss106,035 19,275 (44)125,266 
Contract liabilities109,549 (3,533)— 106,016 
Defined benefit liabilities491,919 35,585 16,850 544,354 
Provisions166,565 60,553 (220)226,898 
Others1,375,118 92,403 (7,148)1,460,373 
Total₩2,249,186 ₩204,283 ₩9,438 ₩2,462,907 
Temporary difference, net(384,664)(78,179)(155,605)(618,448)
Tax credit carryforwards144,614 (4,633)— 139,981 
Total net balance₩(240,050)₩(82,812)₩(155,605)₩(478,467)
Schedule of Tax Impacts Recognized Directly To Equity The tax impacts recognized directly to equity as of December 31, 2023, 2024, and 2025, are as follows:
December 31, 2023December 31, 2024December 31, 2025
(in millions of Korean won)Before
recognition		Tax effectAfter
recognition		Before
recognition		Tax effectAfter
recognition		Before
recognition		Tax effectAfter
recognition
Gain (loss) on valuation of financial assets at fair value through other comprehensive income₩163,750 ₩(41,945)₩121,805 ₩7,626 ₩(1,932)₩5,694 ₩627,461 ₩(169,101)₩458,360 
Gain (loss) on valuation of hedge instruments(30,168)7,555 (22,613)(17,707)4,555 (13,152)76,169 (19,527)56,642 
Remeasurements of net defined benefit liabilities(179,129)41,664 (137,465)(159,757)42,700 (117,057)(1,992)18,338 16,346 
Share of gain (loss) of associates and joint ventures, and others28,715 (7,225)21,490 4,715 (1,194)3,521 (12,051)3,248 (8,803)
Exchange differences on translation for foreign operations32,376 (8,146)24,230 59,053 (14,958)44,095 (42,437)11,437 (31,000)
Gain or loss on disposal of treasury stock402 (101)301 (76)19 (57)(125)33 (92)
Total₩15,946 ₩(8,198)₩7,748 ₩(106,146)₩29,190 ₩(76,956)₩647,025 ₩(155,572)₩491,453 
Schedule of Details of Income Tax Expense Details of income tax expense for the years ended December 31, 2023, 2024 and 2025, are calculated as follows:
(in millions of Korean won)202320242025
Current income tax expense₩347,265 ₩275,454 ₩494,004 
Impact of change in deferred taxes(16,827)(110,609)82,812 
Income tax expense₩330,438 ₩164,845 ₩576,816 
Schedule 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:
(in millions of Korean won)202320242025
Profit before income tax expense₩1,302,620 ₩571,513 ₩2,401,363 
Statutory income tax expense₩333,530 ₩140,517 ₩623,598 
Tax effect
Income not taxable for taxation purposes(30,106)(37,505)(12,444)
Non-deductible expenses26,723 29,192 46,678 
Tax credit(78,459)(42,422)(80,056)
Additional payment of income taxes(4,991)13,338 (3,181)
Adjustments in deferred tax from changes in tax rate564 (25,012)(22,573)
Tax effect and adjustment on consolidation
Goodwill impairment106,010 52,168 9,936 
Changes of out-side tax effect4,436 (6,160)39,064 
Intangible Asset impairment and amortization5,892 (5,850)(1,333)
Reversal expenses of contract cost assets9,281 13,338 (10,307)
Others(42,442)33,241 (12,566)
Income tax expense₩330,438 ₩164,845 ₩576,816 
Schedule 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, 2024 and 2025, are as follows:
(in millions of Korean won)20242025
Deductible temporary differences
Investment in subsidiaries, associates, and joint ventures₩3,799,037 ₩3,501,353 
Unused tax loss212,283 296,436 
Unused Tax credit5,071 3,337 
Others141,405 196,936 
Total₩4,157,796 ₩3,998,062 
Taxable temporary differences
Investment in subsidiaries, associates, and joint ventures₩859,471 ₩720,071 
Others2,631 96,252 
Total₩862,102 ₩816,323 
Schedule 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 of December 31, 2024 and 2025, is as follows:
(in millions of Korean won)20242025
2025₩2,836 ₩— 
20261,897 4,992 
20274,416 — 
2028396 — 
2029617 — 
203038 804 
20314,857 1,031 
20322,552 7,004 
20331,455 9,581 
2034— 468 
20352,160 36 
After 2036191,059 272,520 
Total₩212,283 ₩296,436