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Related parties - The guarantees and purchase agreement provided between the related parties (Details) - KRW (₩)
₩ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Related parties - The guarantees and purchase agreement provided between the related parties [Line Items]    
Amount of guarantees ₩ 1,633,189 ₩ 304,522
BNP Paribas Cardif Life Insurance | Unused credit line | Shinhan Card Co., Ltd. [Member]    
Related parties - The guarantees and purchase agreement provided between the related parties [Line Items]    
Amount of guarantees 810 846
SBC PFV Co., Ltd [Member] | Unused credit commitment | Shinhan Bank Co., Ltd. [Member]    
Related parties - The guarantees and purchase agreement provided between the related parties [Line Items]    
Amount of guarantees 1,226,300 65,400
SBC PFV Co., Ltd [Member] | Unused credit commitment | Shinhan Life Insurance Co., Ltd. [Member]    
Related parties - The guarantees and purchase agreement provided between the related parties [Line Items]    
Amount of guarantees 171,700 0
SBC PFV Co., Ltd [Member] | Unused credit commitment | SHINHAN SECURITIES CO., LTD. [Member]    
Related parties - The guarantees and purchase agreement provided between the related parties [Line Items]    
Amount of guarantees 4,100 0
SBC PFV Co., Ltd [Member] | Unused credit commitment | Shinhan Capital Co., Ltd. [Member]    
Related parties - The guarantees and purchase agreement provided between the related parties [Line Items]    
Amount of guarantees 61,300 0
Key Management Personnel [Member] | Unused credit commitment | Shinhan Bank Co., Ltd. [Member]    
Related parties - The guarantees and purchase agreement provided between the related parties [Line Items]    
Amount of guarantees 989 2,801
Structured Entities [Member] | Purchase agreement | The Group [Member]    
Related parties - The guarantees and purchase agreement provided between the related parties [Line Items]    
Amount of guarantees 131,704 204,035
Structured Entities [Member] | Derivative agreement [Member] | The Group [Member]    
Related parties - The guarantees and purchase agreement provided between the related parties [Line Items]    
Amount of guarantees 6,286 31,440
Songpa biz cluster PFV Co., Ltd. | Unused credit commitment | SHINHAN SECURITIES CO., LTD. [Member]    
Related parties - The guarantees and purchase agreement provided between the related parties [Line Items]    
Amount of guarantees ₩ 30,000 ₩ 0