v3.26.1
Fair value of financial assets and liabilities - Income or expense from financial instruments by category (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Gains Losses On Financial Instruments [Line Items]      
Financial assets at FVTPL ₩ 1,481,044   ₩ 903,451
Financial instruments at FVTPL   ₩ 2,041,520  
Financial assets at FVTOCI 2,016,268 1,389,543 964,781
Financial instruments designated 2,894 (19,647) [1]  
Securities at amortized cost 539,603 646,343 776,964
Loans and other financial assets at amortized cost 16,534,721 18,990,572 17,609,882
Financial liabilities at amortized cost (11,382,194) (13,108,254) (11,885,880)
Net derivatives (Designated for hedging) (449,507) 128,646 15,678
Reclassification adjustments on financial assets measured at fair value through other comprehensive income, net of tax 74 1,831  
Total 8,742,829 10,068,723 8,384,876
Interest Income(expense)      
Gains Losses On Financial Instruments [Line Items]      
Financial assets at FVTPL 303,458   192,094
Financial instruments at FVTPL   236,793  
Financial assets at FVTOCI 1,866,114 1,281,642 999,407
Financial instruments designated 0 0 [1]  
Securities at amortized cost 539,933 643,056 782,513
Loans and other financial assets at amortized cost 18,470,052 19,851,850 18,667,540
Financial liabilities at amortized cost (11,382,195) (13,108,310) (11,887,127)
Net derivatives (Designated for hedging) 0 0 0
Total 9,797,362 8,905,031 8,754,427
Fees and Commissions Income(expense)      
Gains Losses On Financial Instruments [Line Items]      
Financial assets at FVTPL (480)   514
Financial instruments at FVTPL   1,174  
Financial assets at FVTOCI 280 951 1,621
Financial instruments designated 0 0 [1]  
Securities at amortized cost 0 0 0
Loans and other financial assets at amortized cost 44,386 566,911 578,387
Financial liabilities at amortized cost 1 56 1,247
Net derivatives (Designated for hedging) 0 0 0
Total 44,187 569,092 581,769
Reversal (provision) of credit loss      
Gains Losses On Financial Instruments [Line Items]      
Financial assets at FVTPL 0   0
Financial instruments at FVTPL   0  
Financial assets at FVTOCI (10,190) (8,868) (16,542)
Financial instruments designated 0 0 [1]  
Securities at amortized cost (330) 3,287 (5,549)
Loans and other financial assets at amortized cost (2,087,384) (1,715,074) (1,839,987)
Financial liabilities at amortized cost 0 0 0
Net derivatives (Designated for hedging) 0 0 0
Total (2,097,904) (1,720,655) (1,862,078)
Gain or loss on transaction and valuation      
Gains Losses On Financial Instruments [Line Items]      
Financial assets at FVTPL 723,045   488,486
Financial instruments at FVTPL   1,512,430  
Financial assets at FVTOCI 130,620 96,620 (37,641)
Financial instruments designated 2,894 (19,647) [1]  
Securities at amortized cost 0 0 0
Loans and other financial assets at amortized cost 107,667 286,885 203,942
Financial liabilities at amortized cost 0 0 0
Net derivatives (Designated for hedging) (449,507) 128,646 15,678
Total 514,719 2,004,934 670,465
Others      
Gains Losses On Financial Instruments [Line Items]      
Financial assets at FVTPL 455,021   222,357
Financial instruments at FVTPL   291,123  
Financial assets at FVTOCI 29,444 19,198 17,936
Financial instruments designated 0 0 [1]  
Securities at amortized cost 0 0 0
Loans and other financial assets at amortized cost 0 0 0
Financial liabilities at amortized cost 0 0 0
Net derivatives (Designated for hedging) 0 0 0
Total ₩ 484,465 ₩ 310,321 ₩ 240,293
[1] The amounts recognized in other comprehensive income related to financial liabilities designated to be measured at FVTPL are 1,831 million Won during the year ended December 31, 2024.