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Financial risk management - Additional Information (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2025
Dec. 31, 2024
Disclosure of financial risk management [Line Items]    
Addition of capital conservation capital points 2.50%  
Addtion of domestic system critical bank capital points 1.00%  
Addition of economic response capital points (2.50%)  
Financial assets related securitization transactions neither transferred nor derecognized ₩ 10,815,348 ₩ 11,369,662
Financial liabilities related securitization transactions neither transferred nor derecognized ₩ 6,586,888 ₩ 7,144,588
Bottom of range [member]    
Disclosure of financial risk management [Line Items]    
Minimum BIS capital ratio 12.50%  
Capital conservation capital points (2.50%)  
Domestic system critical bank capital points (1.00%)  
Economic resource capital points (1.00%)  
Top of range [member]    
Disclosure of financial risk management [Line Items]    
Economic response capital to be charged during credit expansion 2.50%  
Criteria For Capital Adequacy To Be complied With [Member]    
Disclosure of financial risk management [Line Items]    
Increase in BIS capital ratio 14.00%