v3.26.1
Loans and other financial assets at amortized cost - Details of loans (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure of loans other than banks [Line Items]    
Total ₩ 398,706,030 ₩ 386,069,294
Present value discount    
Disclosure of loans other than banks [Line Items]    
Discounted present value (9,107) (9,272)
Allowance for credit losses    
Disclosure of loans other than banks [Line Items]    
Allowance for credit losses (3,246,252) (3,357,625)
Loans in local currency | Gross carrying amount    
Disclosure of loans other than banks [Line Items]    
Total 322,659,399 315,597,374
Loans in foreign currencies | Gross carrying amount    
Disclosure of loans other than banks [Line Items]    
Total 32,375,735 33,166,984
Domestic banker's usance | Gross carrying amount    
Disclosure of loans other than banks [Line Items]    
Total 2,647,891 2,803,761
Credit card accounts | Gross carrying amount    
Disclosure of loans other than banks [Line Items]    
Total 13,960,884 12,488,523
Bills bought in foreign currencies | Gross carrying amount    
Disclosure of loans other than banks [Line Items]    
Total 4,396,122 4,328,404
Bills bought in local currency | Gross carrying amount    
Disclosure of loans other than banks [Line Items]    
Total 82,657 224,835
Factoring receivables | Gross carrying amount    
Disclosure of loans other than banks [Line Items]    
Total 6,315 5,994
Advances for customers on guarantees | Gross carrying amount    
Disclosure of loans other than banks [Line Items]    
Total 12,602 9,814
Private placement bonds | Gross carrying amount    
Disclosure of loans other than banks [Line Items]    
Total 669,431 444,900
Securitized loans | Gross carrying amount    
Disclosure of loans other than banks [Line Items]    
Total 3,325,383 3,300,876
Call loans | Gross carrying amount    
Disclosure of loans other than banks [Line Items]    
Total 2,430,625 1,847,376
Bonds purchased under resale agreements | Gross carrying amount    
Disclosure of loans other than banks [Line Items]    
Total 14,598,594 10,551,018
Financial lease receivables | Gross carrying amount    
Disclosure of loans other than banks [Line Items]    
Total 991,331 1,106,912
Installment financial bond | Gross carrying amount    
Disclosure of loans other than banks [Line Items]    
Total 2,429,860 2,620,534
Others | Gross carrying amount    
Disclosure of loans other than banks [Line Items]    
Total 2,257 0
Loan origination costs and fees | Gross carrying amount    
Disclosure of loans other than banks [Line Items]    
Total 926,343 938,886
Securities Lending Receivable | Gross carrying amount    
Disclosure of loans other than banks [Line Items]    
Total ₩ 445,960 ₩ 0