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Note 7 Guarantees Received (Details) - EUR (€)
€ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Guarantees received [Line Items]      
Impaired financial assets at amortised cost € 201,433 € 189,602 € 166,013
Value of collateral [Member]      
Guarantees received [Line Items]      
Impaired financial assets at amortised cost 144,844 136,141 125,963
Value of collateral [Member] | Of which guarantees normal risks under special monitoring [Member]      
Guarantees received [Line Items]      
Impaired financial assets at amortised cost 11,318 14,274 12,826
Value of collateral [Member] | Of which guarantees non performing risks [Member]      
Guarantees received [Line Items]      
Impaired financial assets at amortised cost 3,562 4,035 3,440
Value of other guarantees [Member]      
Guarantees received [Line Items]      
Impaired financial assets at amortised cost 56,589 53,462 40,050
Value of other guarantees [Member] | Of which guarantees normal risks under special monitoring [Member]      
Guarantees received [Line Items]      
Impaired financial assets at amortised cost 4,273 4,864 4,963
Value of other guarantees [Member] | Of which guarantees non performing risks [Member]      
Guarantees received [Line Items]      
Impaired financial assets at amortised cost € 1,153 € 1,226 € 984