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Financial assets at fair value through profit or loss - Financial assets at fair value through profit or loss (Details) (Parenthetical) - KRW (₩)
₩ in Millions
Dec. 31, 2025
Dec. 31, 2024
Financial assets at fair value through profit or loss [abstract]    
Customer deposits ₩ 2,965,469 ₩ 1,731,224