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Deposits - Summary of deposits (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2025
Dec. 31, 2024
Deposits [Line Items]    
Deposits ₩ 447,648,971 ₩ 422,781,045
Demand Deposits    
Deposits [Line Items]    
Deposits 172,840,773 160,031,759
Time Deposits    
Deposits [Line Items]    
Deposits 238,328,250 236,527,490
Certificates of deposits    
Deposits [Line Items]    
Deposits 17,001,339 10,409,701
Discount note deposits    
Deposits [Line Items]    
Deposits 8,921,064 7,624,787
CMA    
Deposits [Line Items]    
Deposits 4,889,093 4,451,561
Others    
Deposits [Line Items]    
Deposits 5,668,452 3,735,747
Domestic currency [Member] | Demand Deposits    
Deposits [Line Items]    
Deposits 146,969,815 134,283,019
Domestic currency [Member] | Time Deposits    
Deposits [Line Items]    
Deposits 202,475,134 202,699,097
Foreign currency [Member] | Demand Deposits    
Deposits [Line Items]    
Deposits 25,870,958 25,748,740
Foreign currency [Member] | Time Deposits    
Deposits [Line Items]    
Deposits ₩ 35,853,116 ₩ 33,828,393