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Cash and due from banks at amortized cost - Summary of early redemptions of deposits measured at amortized cost (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2026
Cash and due from banks at amortized cost Early redemptions of deposits measured at amortized cost [Abstract]    
Carrying amount of Installment savings [1] ₩ 137,975  
Gain (loss) from redemption on Installment savings [1] 1,639  
Carrying amount of time deposits [1] 33,186  
Gain (loss) from redemption on time deposits [1] ₩ (6,070)  
Accrued interest of installment savings and time deposits   ₩ 65,737
[1] The carrying amount includes accrued interest of W 65,737 million.