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Net fees and commission income - Summary of net fees and commission income (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Fees and commission income:      
Credit placement fees ₩ 64,109 ₩ 73,339 ₩ 75,930
Commission received as electronic charge receipt 150,709 147,625 146,037
Brokerage fees 529,028 392,836 369,175
Commission received as agency 176,535 153,684 134,432
Investment banking fees 294,948 228,976 165,366
Commission received in foreign exchange activities 452,048 361,341 295,722
Trust management fees 258,331 249,586 299,600
Credit card fees 1,186,972 1,311,422 1,378,200
Operating lease income [1] 651,178 651,691 600,283
Others 800,465 724,866 710,498
Fees and commission income 4,564,323 4,295,366 4,175,243
Fees and commission expense:      
Credit-related fee (45,155) (49,924) (45,739)
Credit card fees (1,018,051) (966,303) (930,044)
Others (579,906) (564,265) (552,254)
Fees and commission expense (1,643,112) (1,580,492) (1,528,037)
Net fees and commission income ₩ 2,921,211 ₩ 2,714,874 ₩ 2,647,206
[1] Among operating lease fees recognized for the years ended December 31, 2023, 2024 and 2025, there is no variable lease fee income which does not vary by index or rate.