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Derivatives - Effect of hedging items on statement financial position, statement of comprehensive income, statement of changes in equity (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Fair value hedges | Interest rate risk      
Disclosure of information about amounts that affected statement of comprehensive income as result of hedge accounting [line items]      
Carrying value of assets [1] ₩ 1,217,304 ₩ 996,275 ₩ 685,340
Carrying value of liabilities [1] 8,984,247 9,167,678 9,224,390
Assets of Cumulative fair value hedge adjustment (7,991) 11,271 41,643
Liabilities of Cumulative fair value hedge adjustment (373,328) (540,967) (579,315)
Changes if fair value in the period (120,061) (45,264) (240,965)
Cash flow hedge reserve 0 0 0
Foreign currency conversion reserves 0 0 0
Fair value hedges | Foreign Exchange Risk      
Disclosure of information about amounts that affected statement of comprehensive income as result of hedge accounting [line items]      
Carrying value of assets [1] 380,113 480,273 544,706
Carrying value of liabilities [1] 0 0 0
Assets of Cumulative fair value hedge adjustment 0 0 0
Liabilities of Cumulative fair value hedge adjustment 0 0 0
Changes if fair value in the period 278 44,094 1,313
Cash flow hedge reserve 0 0 0
Foreign currency conversion reserves 0 0 0
Fair value hedges | Other Price Risk Loans [Member]      
Disclosure of information about amounts that affected statement of comprehensive income as result of hedge accounting [line items]      
Carrying value of assets [1] 0 5,809 5,809
Carrying value of liabilities [1] 0 0 0
Assets of Cumulative fair value hedge adjustment (5,905) (1,548) (1,548)
Liabilities of Cumulative fair value hedge adjustment 0 0 0
Changes if fair value in the period (4,357) (1,548) (1,548)
Cash flow hedge reserve 0 0 0
Foreign currency conversion reserves 0 0 0
Cash Flow Hedges | Interest rate risk      
Disclosure of information about amounts that affected statement of comprehensive income as result of hedge accounting [line items]      
Carrying value of assets [1] 438,011 357,441 641,750
Carrying value of liabilities [1] 349,941 749,708 1,029,542
Assets of Cumulative fair value hedge adjustment 0 0 0
Liabilities of Cumulative fair value hedge adjustment 0 0 0
Changes if fair value in the period 2,303 (3,449) (11,068)
Cash flow hedge reserve (187,801) 25,943 26,648
Foreign currency conversion reserves 0 0 0
Cash Flow Hedges | Foreign Exchange Risk      
Disclosure of information about amounts that affected statement of comprehensive income as result of hedge accounting [line items]      
Carrying value of assets [1] 3,629,809 2,971,800 2,490,098
Carrying value of liabilities [1] 6,030,836 5,045,127 2,342,230
Assets of Cumulative fair value hedge adjustment 0 0 0
Liabilities of Cumulative fair value hedge adjustment 0 0 0
Changes if fair value in the period 234,512 773,828 69,784
Cash flow hedge reserve (57,429) (8,638) (17,812)
Foreign currency conversion reserves 0 0 0
Hedges of net investment | Foreign Exchange Risk      
Disclosure of information about amounts that affected statement of comprehensive income as result of hedge accounting [line items]      
Carrying value of assets [1] 0 0 0
Carrying value of liabilities [1] 0 0 0
Assets of Cumulative fair value hedge adjustment 0 0 0
Liabilities of Cumulative fair value hedge adjustment 0 0 0
Changes if fair value in the period (59,096) 221,221 3,903
Cash flow hedge reserve 0 0 0
Foreign currency conversion reserves ₩ 125,194 ₩ 184,291 ₩ (36,931)
[1] The related account categories are presented in the amounts of borrowings, bonds, and others.