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Financial risk management - Fair Value measurement of financial assets and liabilities measured at fair value (Parenthetical) (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2025
Dec. 31, 2024
Derivatives-combined securities    
Statements [Line Items]    
Financial instruments related to repurchase partners asset management ₩ 181,800 ₩ 175,000
Beneficiary certificates [Member]    
Statements [Line Items]    
Financial instruments related to repurchase partners asset management 181,800 175,000
Financial assets at fair value through profit or loss    
Statements [Line Items]    
Financial assets invested by valuation of amount related to lime asset management 27,000 40,800
Level 3 | Derivative liabilities | Shinhan Securities Co., Ltd.    
Statements [Line Items]    
Derivative liabilities valuation amount for over the counter 284,145 535,162
Level 3 | Financial liabilities at fair value through profit or loss, designated upon initial recognition or subsequently, category [member] | Shinhan Securities Co., Ltd.    
Statements [Line Items]    
Derivative financial liabilities valuation amount for over the counter 5,834,683 7,146,909
Level 3 | Financial assets at fair value through profit or loss | Shinhan Securities Co., Ltd.    
Statements [Line Items]    
Derivative financial assets valuation amount for over the counter 47,665 86,279
Level 3 | Derivative assets | Shinhan Securities Co., Ltd.    
Statements [Line Items]    
Derivative assets valuation amount for over the counter ₩ 146,924 ₩ 718,788