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Related parties - Collaterals provided by the related parties (Details) - Shinhan Bank Co., Ltd. [Member] - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Related parties - Collaterals provided by the related parties [Line Items]    
Amount of collaterals ₩ 1,515,627 ₩ 1,026,797
Logisvalley Shinhan REIT Co., Ltd. | Collateral trust [Member]    
Related parties - Collaterals provided by the related parties [Line Items]    
Amount of collaterals 39,600 39,600
Nomura-Rifa Private Real Estate Investment Trust 31 | Collateral trust [Member]    
Related parties - Collaterals provided by the related parties [Line Items]    
Amount of collaterals 16,632 16,800
SBC PFV Co., Ltd [Member]    
Related parties - Collaterals provided by the related parties [Line Items]    
Amount of collaterals 1,447,529 960,000
SBC PFV Co., Ltd [Member] | Collateral trust [Member]    
Related parties - Collaterals provided by the related parties [Line Items]    
Amount of collaterals 1,440,000 960,000
SBC PFV Co., Ltd [Member] | Shares [Member]    
Related parties - Collaterals provided by the related parties [Line Items]    
Amount of collaterals 7,529 0
Key Management Personnel [Member]    
Related parties - Collaterals provided by the related parties [Line Items]    
Amount of collaterals 11,866 10,397
Key Management Personnel [Member] | Properties [Member]    
Related parties - Collaterals provided by the related parties [Line Items]    
Amount of collaterals 9,103 6,799
Key Management Personnel [Member] | Deposits and etc [Member]    
Related parties - Collaterals provided by the related parties [Line Items]    
Amount of collaterals 1,783 1,466
Key Management Personnel [Member] | Guarantee [Member]    
Related parties - Collaterals provided by the related parties [Line Items]    
Amount of collaterals ₩ 980 ₩ 2,132