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Net gains (losses) on financial instruments designated at fair value through profit or loss - Net gains (losses) on financial instruments designated at fair value through profit or loss (Details) - Financial liabilities designated at fair value through profit or loss - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Net gain (loss) on financial instruments designated at fair value through profit or loss [Line Items]      
Gain (loss) on valuation ₩ 19,796 ₩ (29,162) ₩ 51,750
Gain on sale 11 0 0
Gains Losses On Financial Liabilities At Fair Value Through Profit Or Loss Classified As Securities 23,446 (6,466) 2,495
Gain (loss) on valuation 23,435 (6,466) 2,495
Loss on sale and redemption (457,190) (308,825) (492,025)
Gains (losses) on financial liabilities at fair value through profit or loss (437,394) (337,987) (440,275)
Net gain (loss) on financial instruments designated at fair value through profit or loss ₩ (413,948) ₩ (344,453) ₩ (437,780)