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Note 46 Balances Arising From Transactions With Entities Of The Group Explanatory (Details) - EUR (€)
Jun. 30, 2021
Dec. 31, 2020
Assets [member]    
Disclosure of transactions between related parties [line items]    
Loans and advances to banks € 6,000,000 € 148,000,000
Loans and advances to customers 1,715,000,000 1,743,000,000
Net debt 6,000,000 0
Liabilities [member]    
Disclosure of transactions between related parties [line items]    
Deposits from customers 481,000,000 791,000,000
Memorandum accounts [Member]    
Disclosure of transactions between related parties [line items]    
Contingent Commitments Related Party Transactions 140,000,000 132,000,000
Other Commitments Given Related Party Transactions 1,153,000,000 1,400,000,000
Financial Guarantees Given Related Party Transactions € 12,000,000 € 11,000,000