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Note 7 Encumbered and unencumbered asstes (Details) - EUR (€)
€ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Book value [Member] | Total assets encumbered and unencumbered [Member]      
Encumbered and unencumbered assets [Line Items]      
Encumbered assets € 68,268 € 78,586 € 92,916
Unencumbered assets 704,134 696,972 619,177
Book value [Member] | equity instruments [Member]      
Encumbered and unencumbered assets [Line Items]      
Encumbered assets 834 592 819
Unencumbered assets 17,159 13,176 11,293
Book value [Member] | Debt securities [Member]      
Encumbered and unencumbered assets [Line Items]      
Encumbered assets 43,404 51,458 33,533
Unencumbered assets 102,333 88,976 92,665
Book value [Member] | Loans and advances and other [Member]      
Encumbered and unencumbered assets [Line Items]      
Encumbered assets 24,030 26,535 58,563
Unencumbered assets 584,641 594,821 515,218
Market value [Member] | equity instruments [Member]      
Encumbered and unencumbered assets [Line Items]      
Encumbered assets 834 592 819
Unencumbered assets 17,159 13,176 11,293
Market value [Member] | Debt securities [Member]      
Encumbered and unencumbered assets [Line Items]      
Encumbered assets 45,639 50,818 32,291
Unencumbered assets € 102,333 € 88,976 € 92,665