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Reporting entity - Ownership of Shinhan Financial Group and its material consolidated subsidiaries (Parenthetical) (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Subsidiary Jeju Bank [Member]    
Disclosure of subsidiaries [line items]    
Proportion of ownership interest in subsidiary 64.00% 75.30%
Subsidiary Jeju Bank [Member] | Top of range [member]    
Disclosure of subsidiaries [line items]    
Proportion of ownership interest in subsidiary 75.30%  
Subsidiary Jeju Bank [Member] | Bottom of range [member]    
Disclosure of subsidiaries [line items]    
Proportion of ownership interest in subsidiary 64.00%  
Subsidiary Shinhan EZ General Insurance Co Ltd [Member]    
Disclosure of subsidiaries [line items]    
Paid in capital increase ₩ 100,000  
Proportion of ownership interest in subsidiary 91.70% 85.10%
Subsidiary Shinhan EZ General Insurance Co Ltd [Member] | Top of range [member]    
Disclosure of subsidiaries [line items]    
Proportion of ownership interest in subsidiary 91.70%  
Subsidiary Shinhan EZ General Insurance Co Ltd [Member] | Bottom of range [member]    
Disclosure of subsidiaries [line items]    
Proportion of ownership interest in subsidiary 85.10%  
SBJDNX and Shinhan Bank Japan [Member] | Top of range [member]    
Disclosure of subsidiaries [line items]    
Proportion of ownership interest in subsidiary 100.00%  
SBJDNX and Shinhan Bank Japan [Member] | Bottom of range [member]    
Disclosure of subsidiaries [line items]    
Proportion of ownership interest in subsidiary 90.00%  
LLP MFO Shinhan Finance [Member] | Top of range [member]    
Disclosure of subsidiaries [line items]    
Proportion of ownership interest in subsidiary 75.00%  
LLP MFO Shinhan Finance [Member] | Bottom of range [member]    
Disclosure of subsidiaries [line items]    
Proportion of ownership interest in subsidiary 72.10%