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Financial liabilities designated at fair value through profit or loss - Summary of financial liabilities at fair value through profit or loss (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2025
Dec. 31, 2024
Financial liabilities designated at fair value through profit or loss [Line Items]    
Financial liabilities designated at fair value through profit or loss ₩ 6,378,064 ₩ 8,220,475
Financial liabilities designated at fair value through profit or loss    
Financial liabilities designated at fair value through profit or loss [Line Items]    
Financial liabilities designated at fair value through profit or loss 6,378,064 8,220,475
Debt securities issued    
Financial liabilities designated at fair value through profit or loss [Line Items]    
Financial liabilities designated at fair value through profit or loss 287,849 261,299
Derivative-linked securities sold    
Financial liabilities designated at fair value through profit or loss [Line Items]    
Financial liabilities designated at fair value through profit or loss ₩ 6,090,215 ₩ 7,959,176