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Assets Pledged as Collateral and Assets Held as Collateral - Summary of assets pledged as collateral (Details) - KRW (₩)
₩ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Assets pledged as collateral [Line Items]    
Assets pledged as collateral ₩ 156,351 ₩ 586,768
Loans | Financial assets at amortised cost    
Assets pledged as collateral [Line Items]    
Assets pledged as collateral ₩ 0 119,699
Reasons for collateral Pledge for borrowing transaction  
Securities    
Assets pledged as collateral [Line Items]    
Assets pledged as collateral ₩ 47,683,065 26,526,038
Securities | Financial assets at fair value through profit or loss    
Assets pledged as collateral [Line Items]    
Assets pledged as collateral ₩ 12,402,270 14,837,334
Reasons for collateral Customer RP, etc.  
Securities | Financial assets at amortised cost    
Assets pledged as collateral [Line Items]    
Assets pledged as collateral ₩ 21,845,620 1,464,788
Reasons for collateral Borrowings, Settlement security for Bank of Korea, Customer RP, etc.  
Securities | Financial assets at fair value through other comprehensive income    
Assets pledged as collateral [Line Items]    
Assets pledged as collateral ₩ 13,435,175 10,223,916
Reasons for collateral Borrowings, Settlement security for Bank of Korea, Borrowed securities, etc.  
Deposits | Financial assets at amortised cost    
Assets pledged as collateral [Line Items]    
Assets pledged as collateral ₩ 315,986 1,845,022
Reasons for collateral Borrowings, etc.  
Property and Equipment (real estate)    
Assets pledged as collateral [Line Items]    
Assets pledged as collateral ₩ 3,474 5,515
Reasons for collateral Establishing the right to collateral security, etc.  
Assets pledged as collateral    
Assets pledged as collateral [Line Items]    
Assets pledged as collateral ₩ 48,002,525 ₩ 28,496,274