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Related parties - Significant borrowing and repayment transactions with related parties (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure Of significant borrowing and repayment transactions with related parties [Line Items]    
Beginning ₩ 422,781,045  
Ending 447,648,971 ₩ 422,781,045
Investments In Associates [Member]    
Disclosure Of significant borrowing and repayment transactions with related parties [Line Items]    
Beginning 21,159 513
Borrowing 45,800 49,904
Repayment (48,559) (29,258)
Ending 18,400 21,159
NH-J&-IBKC Label Technology Fund | Investments In Associates [Member]    
Disclosure Of significant borrowing and repayment transactions with related parties [Line Items]    
Beginning 59 248
Borrowing 0 522
Repayment (59) (711)
Ending 0 59
Shinhan Rio Green Private Equity Fund [Member] | Investments In Associates [Member]    
Disclosure Of significant borrowing and repayment transactions with related parties [Line Items]    
Beginning 0  
Borrowing 4,600  
Repayment (4,600)  
Ending 0 0
TECHFIN RATINGS Co., Ltd [Member] | Investments In Associates [Member]    
Disclosure Of significant borrowing and repayment transactions with related parties [Line Items]    
Beginning 18,000 0
Borrowing 24,500 46,000
Repayment (29,000) (28,000)
Ending 13,500 18,000
CJL No.1 Private Equity Fund | Investments In Associates [Member]    
Disclosure Of significant borrowing and repayment transactions with related parties [Line Items]    
Beginning 0 265
Borrowing   282
Repayment   (547)
Ending   0
ShinhanCJ TechInnovation Fund 1st [Member] | Investments In Associates [Member]    
Disclosure Of significant borrowing and repayment transactions with related parties [Line Items]    
Beginning 3,100 0
Borrowing 14,500 3,100
Repayment (14,100) 0
Ending 3,500 3,100
D2U 12th Fund [Member] | Investments In Associates [Member]    
Disclosure Of significant borrowing and repayment transactions with related parties [Line Items]    
Beginning 0  
Borrowing 900  
Repayment (500)  
Ending 400 0
Meta TB ESG Private Equity Fund I [Member] | Investments In Associates [Member]    
Disclosure Of significant borrowing and repayment transactions with related parties [Line Items]    
Beginning 0  
Borrowing 300  
Repayment (300)  
Ending 0 0
Korea Credit Bureau [Member] | Investments In Associates [Member]    
Disclosure Of significant borrowing and repayment transactions with related parties [Line Items]    
Beginning 0  
Borrowing 1,000  
Repayment 0  
Ending ₩ 1,000 ₩ 0