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Gains or losses on financial assets and liabilities - Schedule of detail of asset balances measured at fair value through profit or loss (Details) - EUR (€) € in Millions | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
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Financial instruments |  |  |
Financial assets at fair value through profit or loss | € 268,125 | € 244,298 | € 192,604
Loans and advances |  |  |
Financial instruments |  |  |
Financial assets at fair value through profit or loss | 80,218 | 72,931 | 51,072
Central banks |  |  |
Financial instruments |  |  |
Financial assets at fair value through profit or loss | 14,632 | 12,966 | 17,717
Credit institutions |  |  |
Financial instruments |  |  |
Financial assets at fair value through profit or loss | 26,380 | 27,722 | 14,520
Customers |  |  |
Financial instruments |  |  |
Financial assets at fair value through profit or loss | 39,206 | 32,243 | 18,835
Debt securities |  |  |
Financial instruments |  |  |
Financial assets at fair value through profit or loss | 101,707 | 85,990 | 66,079
Equity instruments |  |  |
Financial instruments |  |  |
Financial assets at fair value through profit or loss | 27,845 | 21,277 | 19,125
Derivatives |  |  |
Financial instruments |  |  |
Financial assets at fair value through profit or loss | € 58,355 | € 64,100 | € 56,328

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