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Gains or losses on financial assets and liabilities - Schedule of detail of liability 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 liabilities at fair value through profit or loss | € 213,694 | € 188,511 | € 162,637
Deposits |  |  |
Financial instruments |  |  |
Financial liabilities at fair value through profit or loss | 106,003 | 87,374 | 80,503
Central banks |  |  |
Financial instruments |  |  |
Financial liabilities at fair value through profit or loss | 15,471 | 15,074 | 9,017
Credit institutions |  |  |
Financial instruments |  |  |
Financial liabilities at fair value through profit or loss | 28,482 | 27,909 | 19,597
Customers |  |  |
Financial instruments |  |  |
Financial liabilities at fair value through profit or loss | 62,050 | 44,391 | 51,889
Marketable debt securities |  |  |
Financial instruments |  |  |
Financial liabilities at fair value through profit or loss | 11,686 | 7,554 | 5,371
Short positions |  |  |
Financial instruments |  |  |
Financial liabilities at fair value through profit or loss | 44,015 | 35,830 | 26,174
Derivatives |  |  |
Financial instruments |  |  |
Financial liabilities at fair value through profit or loss | 51,968 | 57,753 | 50,589
Other financial liabilities |  |  |
Financial instruments |  |  |
Financial liabilities at fair value through profit or loss | € 22 | € 0 | € 0

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