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Net interest income - Summary of net interest income (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Interest income:      
Cash and due from banks at amortized cost ₩ 781,197 ₩ 780,046 ₩ 590,831
Deposits at FVTPL 1,305 133 0
Securities at FVTPL 1,499,121 1,693,064 1,396,409
Securities at FVOCI 2,888,284 2,744,083 2,357,108
Securities at amortized cost 1,044,061 1,101,721 1,062,110
Loans at amortized cost 21,311,377 22,410,903 21,676,818
Loans at FVTPL 89,239 100,122 120,815
Insurance finance interest income 232,272 219,409 240,534
Others 141,945 159,857 134,586
Interest income 27,988,801 29,209,338 27,579,211
Interest expense:      
Deposits (9,202,286) (10,220,774) (9,790,811)
Financial liabilities designated at FVTPL (14,792) (13,292) (9,804)
Borrowings (1,534,773) (1,862,406) (1,895,913)
Debt securities issued (3,332,621) (3,408,678) (2,735,421)
Insurance finance interest expense (1,885,044) (1,901,536) (1,945,318)
Others (324,829) (400,350) (384,022)
Interest expense (16,294,345) (17,807,036) (16,761,289)
Net interest income ₩ 11,694,456 ₩ 11,402,302 ₩ 10,817,922