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Cash and due from banks at amortized cost (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2025
Dec. 31, 2024
Cash and cash equivalents :    
Cash ₩ 2,882,978 ₩ 2,296,962
Due from banks at amortized cost :    
Allowance for credit losses (16,100) (21,342)
Cash and Due from banks at amortized cost, total 39,742,605 40,525,712
Denominated in Korean won    
Due from banks at amortized cost :    
Reserve deposits 8,164,072 11,594,266
Time deposits 893,222 2,198,645
Certificate of deposit 19,434 0
Other 4,286,250 3,365,689
Due from banks at amortized cost, total 13,362,978 17,158,600
Denominated in foreign currency    
Due from banks at amortized cost :    
Deposits 16,942,214 14,934,942
Time deposits 3,908,381 3,956,971
Other 2,662,154 2,199,579
Due from banks at amortized cost, total ₩ 23,512,749 ₩ 21,091,492