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Note 6 Guarantees Received (Details) - EUR (€)
Jun. 30, 2021
Dec. 31, 2020
Guarantees received [Line Items]    
Impaired financial assets at amortised cost € 165,906,000,000 € 163,912,000,000
Real guarantees [Member]    
Guarantees received [Line Items]    
Impaired financial assets at amortised cost 117,917,000,000 116,900,000,000
Real guarantees [Member] | Of which normal risk [Member]    
Guarantees received [Line Items]    
Impaired financial assets at amortised cost 11,951,000,000 11,296,000,000
Real guarantees [Member] | Of which doubtful risk [Member]    
Guarantees received [Line Items]    
Impaired financial assets at amortised cost 3,699,000,000 3,577,000,000
Other guarantees [Member]    
Guarantees received [Line Items]    
Impaired financial assets at amortised cost 47,988,000,000 47,012,000,000
Other guarantees [Member] | Of which normal risk [Member]    
Guarantees received [Line Items]    
Impaired financial assets at amortised cost 6,042,000,000 4,045,000,000
Other guarantees [Member] | Of which doubtful risk [Member]    
Guarantees received [Line Items]    
Impaired financial assets at amortised cost € 768,000,000 € 575,000,000