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Net fees and commission income - Summary of net fees and commission income (Parenthetical) (Details) - KRW (₩)
₩ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Fee and commission income (expense) [abstract]      
Operating lease fees ₩ 0 ₩ 0 ₩ 0