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Risk management - Schedule of on-balance-sheet encumbered assets (Details) - EUR (€) € in Millions | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | --- | ---
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |
Loans and advances to customers | € 1,867,515 | € 1,837,081 | € 1,797,062
Encumbered assets | On-balance-sheet assets | Liquidity risk |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |
Loans and advances to customers | 304,923 |  |
Encumbered assets | On-balance-sheet assets | Loans and advances | Liquidity risk |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |
Loans and advances to customers | 152,500 |  |
Encumbered assets | On-balance-sheet assets | Equity instruments | Liquidity risk |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |
Loans and advances to customers | 11,400 |  |
Fair value of assets | 11,400 |  |
Encumbered assets | On-balance-sheet assets | Debt securities | Liquidity risk |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |
Loans and advances to customers | 117,900 |  |
Fair value of assets | 118,500 |  |
Encumbered assets | On-balance-sheet assets | Other | Liquidity risk |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |
Loans and advances to customers | 23,100 |  |
Non-encumbered assets | On-balance-sheet assets | Liquidity risk |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |
Loans and advances to customers | 1,562,700 |  |
Non-encumbered assets | On-balance-sheet assets | Loans and advances | Liquidity risk |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |
Loans and advances to customers | 1,149,400 |  |
Non-encumbered assets | On-balance-sheet assets | Equity instruments | Liquidity risk |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |
Loans and advances to customers | 18,700 |  |
Fair value of assets | 0 |  |
Non-encumbered assets | On-balance-sheet assets | Debt securities | Liquidity risk |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |
Loans and advances to customers | 182,200 |  |
Fair value of assets | 180,700 |  |
Non-encumbered assets | On-balance-sheet assets | Other | Liquidity risk |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |
Loans and advances to customers | € 212,400 |  |

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