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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
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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

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