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Commitments and contingencies (Details)
₩ in Millions, $ in Millions
 5 Months Ended
Jan. 22, 2021
KRW (₩)
Sep. 30, 2017
USD ($)
Dec. 31, 2025
KRW (₩)
Dec. 31, 2024
KRW (₩)
Sep. 28, 2021
litigations [Line Items]          
Covered Bonds Issued Carrying Amount     ₩ 1,916,820 ₩ 1,852,365  
Cover Pools Carrying Amount     3,647,109 ₩ 4,458,312  
Shinhan Asset Trust Co., Ltd. [Member]          
litigations [Line Items]          
Project Financing Loan Commitment Unused Limit     263,836    
16 project sites [Member] | Shinhan Asset Trust Co., Ltd. [Member]          
litigations [Line Items]          
Project Financing Commitment Amount     1,059,277    
Project Financing Outstanding Loan Balance     993,054    
8 project sites [Member] | Shinhan Asset Trust Co., Ltd. [Member]          
litigations [Line Items]          
Project Financing Commitment Amount     249,927    
Project Financing Outstanding Loan Balance     224,123    
Events After Reporting Period [Member]          
litigations [Line Items]          
Loss Contingency Penalty Amount ₩ 50        
Board Of Directors [Member]          
litigations [Line Items]          
Percentage of investment principal repaid to the Customer         40.00%
Gen2 Related Trust Instruments          
litigations [Line Items]          
Securities sold under agreements to repurchase     420,000    
Lime Asset Management | Total Return Swap Agreement          
litigations [Line Items]          
Purchase of investments other than investments accounted for using equity method | $   $ 200      
Miscellaneous other provisions          
litigations [Line Items]          
Provisions and insurance contract liabilities     144,173    
insurance contract Liabilities          
litigations [Line Items]          
Provisions and insurance contract liabilities     ₩ 5,732