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Defined benefit plans - Summary of composition of plan assets (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2025
Dec. 31, 2024
Disclosure of fair value of plan assets [abstract]    
Debt securities ₩ 42,296 ₩ 38,634
Due from banks 1,729,816 2,046,507
Other 876,333 376,730
Plan assets ₩ 2,648,445 ₩ 2,461,871