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Memorandum items - Schedule of off-balance sheet funds managed by the entity and joint ventures (Details) - EUR (€) € in Millions | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
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Disclosure of unconsolidated structured entities [line items] |  |  |
Off-balance sheet assets managed by the entity and by joint ventures | € 257,432 | € 230,485 | € 209,737
Investment funds |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |
Off-balance sheet assets managed by the entity and by joint ventures | 197,346 | 178,840 | 165,174
Pension funds |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |
Off-balance sheet assets managed by the entity and by joint ventures | 16,112 | 15,646 | 14,831
Assets under management |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |
Off-balance sheet assets managed by the entity and by joint ventures | € 43,974 | € 35,999 | € 29,732

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