v3.26.1
Securities at amortized cost - Changes in allowance for credit losses of securities at amortized cost (Details) - Securities at amortized cost - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of reconciliation of changes in loss allowance for securities at amortised cost [Line Items]      
Beginning balance ₩ (10,763) ₩ (13,941) ₩ (8,385)
Increase (decrease) in impairment loss securities at amortised cost [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 reversal (provision) of loss allowance (330) 3,287 (5,549)
Others [1] 26 (109) (7)
Ending balance (11,067) (10,763) (13,941)
Stage 1      
Disclosure of reconciliation of changes in loss allowance for securities at amortised cost [Line Items]      
Beginning balance (10,763) (13,941) (8,385)
Increase (decrease) in impairment loss securities at amortised cost [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 reversal (provision) of loss allowance (330) 3,287 (5,549)
Others [1] 26 (109) (7)
Ending balance (11,067) (10,763) (13,941)
Stage 2      
Disclosure of reconciliation of changes in loss allowance for securities at amortised cost [Line Items]      
Beginning balance 0 0 0
Increase (decrease) in impairment loss securities at amortised cost [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 reversal (provision) of loss allowance 0 0 0
Others [1] 0 0 0
Ending balance 0 0 0
Stage 3      
Disclosure of reconciliation of changes in loss allowance for securities at amortised cost [Line Items]      
Beginning balance 0 0 0
Increase (decrease) in impairment loss securities at amortised cost [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 reversal (provision) of loss allowance 0 0 0
Others [1] 0 0 0
Ending balance ₩ 0 ₩ 0 ₩ 0
[1] Changes due to foreign currencies translation, etc.