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Other operating income and expenses (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Analysis of income and expense [abstract] |  |  |  |
Other operating income | [1] | € 1,583 | € 846 | € 1,137
Non- financial services |  | 738 | 654 | 752
Other operating income |  | 845 | 192 | 385
Other operating expense |  | (2,429) | (2,595) | (3,066)
Non-financial services |  | (650) | (498) | (674)
Other operating expense |  | (1,779) | (2,097) | (2,392)
Of which, credit institutions deposit guarantee fund and single resolution fund |  | (478) | (481) | (1,083)
Total other operating income and expenses |  | € (846) | € (1,749) | € (1,929)
[1] | Includes EUR -486 million at 31 December 2025 (EUR -1,225 and EUR -1,016 at 31 December 2024 and 2023, respectively) derived from the net loss generated in Argentina as a result of the application of IAS 29 Financial reporting in hyperinflationary economies.

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