v3.26.1
Note 6 Guarantees Received (Details) - EUR (€)
€ in Millions
Jun. 30, 2026
Dec. 31, 2025
Guarantees received [Line Items]    
Impaired financial assets at amortised cost € 237,161 € 217,690
Value of collateral [Member]    
Guarantees received [Line Items]    
Impaired financial assets at amortised cost 164,157 151,746
Value of collateral [Member] | Of which guarantees normal risks under special monitoring [Member]    
Guarantees received [Line Items]    
Impaired financial assets at amortised cost 12,254 11,626
Value of collateral [Member] | Of which guarantees non performing risks [Member]    
Guarantees received [Line Items]    
Impaired financial assets at amortised cost 2,996 3,081
Value of other guarantees [Member]    
Guarantees received [Line Items]    
Impaired financial assets at amortised cost 73,004 65,944
Value of other guarantees [Member] | Of which guarantees normal risks under special monitoring [Member]    
Guarantees received [Line Items]    
Impaired financial assets at amortised cost 4,370 3,999
Value of other guarantees [Member] | Of which guarantees non performing risks [Member]    
Guarantees received [Line Items]    
Impaired financial assets at amortised cost € 942 € 907