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Note 7 Guarantees Received (Details) - EUR (€)
€ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Guarantees received [Line Items]      
Impaired financial assets at amortised cost € 166,042 € 163,912 € 187,918
Value of collateral [Member]      
Guarantees received [Line Items]      
Impaired financial assets at amortised cost 117,362 116,900 152,454
Value of collateral [Member] | Of which guarantees normal risks under special monitoring [Member]      
Guarantees received [Line Items]      
Impaired financial assets at amortised cost 11,768 11,296 14,623
Value of collateral [Member] | Of which guarantees non performing risks [Member]      
Guarantees received [Line Items]      
Impaired financial assets at amortised cost 3,981 3,577 4,590
Value of other guarantees [Member]      
Guarantees received [Line Items]      
Impaired financial assets at amortised cost 48,680 47,012 35,464
Value of other guarantees [Member] | Of which guarantees normal risks under special monitoring [Member]      
Guarantees received [Line Items]      
Impaired financial assets at amortised cost 7,404 4,045 3,306
Value of other guarantees [Member] | Of which guarantees non performing risks [Member]      
Guarantees received [Line Items]      
Impaired financial assets at amortised cost € 886 € 575 € 542