v3.26.1
Loans and other financial assets at amortized cost - Changes in gross carrying amount of due from banks (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Reconciliation of changes in gross carrying amount of due from financial institutions [Line Items]      
Beginning balance ₩ 486,850,601    
Changes in gross carrying amount of due from financial institutions [Abstract]      
Ending balance 549,165,419 ₩ 486,850,601  
Due from bank | Allowance for credit losses      
Reconciliation of changes in gross carrying amount of due from financial institutions [Line Items]      
Beginning balance 2,636,931 1,966,419 ₩ 3,006,989
Changes in gross carrying amount of due from financial institutions [Abstract]      
Transfer to 12-month expected credit losses 0 0 0
Transfer to lifetime expected credit losses 0 0 0
Transfer to credit-impaired financial assets 0 0 0
Net increase (decrease) (758,983) 390,154 (1,154,265)
Changes due to business combinations 807,306 165,476 113,000
Others [1] (5,930) 114,882 695
Ending balance 2,679,324 2,636,931 1,966,419
Due from bank | Allowance for credit losses | Stage 1      
Reconciliation of changes in gross carrying amount of due from financial institutions [Line Items]      
Beginning balance 2,636,931 1,966,419 3,006,989
Changes in gross carrying amount of due from financial institutions [Abstract]      
Transfer to 12-month expected credit losses 0 0 0
Transfer to lifetime expected credit losses 0 0 0
Transfer to credit-impaired financial assets 0 0 0
Net increase (decrease) (758,983) 390,154 (1,154,265)
Changes due to business combinations 807,306 165,476 113,000
Others [1] (5,930) 114,882 695
Ending balance 2,679,324 2,636,931 1,966,419
Due from bank | Allowance for credit losses | Lifetime expected credit losses | Stage 2      
Reconciliation of changes in gross carrying amount of due from financial institutions [Line Items]      
Beginning balance 0 0 0
Changes in gross carrying amount of due from financial institutions [Abstract]      
Transfer to 12-month expected credit losses 0 0 0
Transfer to lifetime expected credit losses 0 0 0
Transfer to credit-impaired financial assets 0 0 0
Net increase (decrease) 0 0 0
Changes due to business combinations 0 0 0
Others [1] 0 0 0
Ending balance 0 0 0
Due from bank | Allowance for credit losses | Lifetime expected credit losses | Stage 3      
Reconciliation of changes in gross carrying amount of due from financial institutions [Line Items]      
Beginning balance 0 0 0
Changes in gross carrying amount of due from financial institutions [Abstract]      
Transfer to 12-month expected credit losses 0 0 0
Transfer to lifetime expected credit losses 0 0 0
Transfer to credit-impaired financial assets 0 0 0
Net increase (decrease) 0 0 0
Changes due to business combinations 0 0 0
Others [1] 0 0 0
Ending balance ₩ 0 ₩ 0 ₩ 0
[1] Changes due to foreign currencies translation, etc