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Trading derivatives (Details) - EUR (€) € in Millions | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | --- | ---
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |
Notional amount | € 505,992 | € 511,727 | € 418,294
Trading derivatives |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |
Notional amount | 10,250,140 | 9,978,141 | 7,837,818
Market value | 6,387 | 6,347 | 5,739
Trading derivatives | Forward rate agreements |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |
Notional amount | 1,995,070 | 1,992,413 | 829,913
Market value | (32) | 13 | 3
Trading derivatives | Interest rate swaps |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |
Notional amount | 6,166,278 | 6,127,812 | 5,381,966
Market value | 6,324 | 6,364 | 5,514
Trading derivatives | Options, futures and other derivatives |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |
Notional amount | 470,659 | 377,285 | 398,519
Market value | (472) | (297) | (51)
Trading derivatives | Credit default swaps |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |
Notional amount | 64,924 | 41,111 | 22,462
Market value | (3,135) | (572) | (86)
Trading derivatives | Foreign currency purchases and sales |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |
Notional amount | 611,850 | 514,268 | 471,955
Market value | 1,282 | 595 | 33
Trading derivatives | Foreign currency options |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |
Notional amount | 160,421 | 221,159 | 77,934
Market value | 441 | 528 | 288
Trading derivatives | Currency swap contract |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |
Notional amount | 682,350 | 625,765 | 586,405
Market value | 2,526 | (838) | (581)
Trading derivatives | Securities and commodities derivatives and other |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |
Notional amount | 98,588 | 78,328 | 68,664
Market value | € (547) | € 554 | € 619

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