v3.26.1
Net gain or loss on financial instruments at fair value through profit or loss - Summary of gain or loss on financial instruments at fair value through profit or loss and financial instruments held for trading (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Financial assets at FVTPL      
Gains losses on financial instruments held for trading [Line Items]      
Gain (loss) from financial instruments ₩ 350,392 ₩ 403,166 ₩ 692,332
Securities      
Gains losses on financial instruments held for trading [Line Items]      
Gain on transactions and valuation 1,138,390 701,955 889,250
Loss on transactions and valuation (805,531) (306,311) (191,144)
Gain (loss) from financial instruments 332,859 395,644 698,106
Loans      
Gains losses on financial instruments held for trading [Line Items]      
Gain on transactions and valuation 19,233 16,825 6,064
Loss on transactions and valuation (5,978) (1,738) (2,289)
Gain (loss) from financial instruments 13,255 15,087 3,775
Other financial assets      
Gains losses on financial instruments held for trading [Line Items]      
Gain on transactions and valuation 41,385 12,715 9,742
Loss on transactions and valuation (37,107) (20,280) (19,291)
Gain (loss) from financial instruments 4,278 (7,565) (9,549)
Derivatives (Held for trading)      
Gains losses on financial instruments held for trading [Line Items]      
Gain (loss) from financial instruments 372,653 1,109,264 (203,846)
Interest rates derivatives      
Gains losses on financial instruments held for trading [Line Items]      
Gain on transactions and valuation 2,138,404 2,981,638 4,741,233
Loss on transactions and valuation (1,906,465) (2,945,172) (4,990,352)
Gain (loss) from financial instruments 231,939 36,466 (249,119)
Currency derivatives      
Gains losses on financial instruments held for trading [Line Items]      
Gain on transactions and valuation 9,140,527 14,841,349 7,677,720
Loss on transactions and valuation (9,015,260) (13,757,446) (7,528,291)
Gain (loss) from financial instruments 125,267 1,083,903 149,429
Equity derivatives      
Gains losses on financial instruments held for trading [Line Items]      
Gain on transactions and valuation 283,462 1,182,962 3,169,071
Loss on transactions and valuation (268,067) (1,194,068) (3,273,202)
Gain (loss) from financial instruments 15,395 (11,106) (104,131)
Other derivatives      
Gains losses on financial instruments held for trading [Line Items]      
Gain on transactions and valuation 52 27 14
Loss on transactions and valuation 0 (26) (39)
Gain (loss) from financial instruments 52 1 (25)
Derivatives Held For Trading      
Gains losses on financial instruments held for trading [Line Items]      
Gain (loss) from financial instruments ₩ 723,045 ₩ 1,512,430 ₩ 488,486