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Note 47 - Related-Party Transactions - Balances Arising From Transactions With Entities Of The Group (Details) - EUR (€)
Jun. 30, 2020
Dec. 31, 2019
Disclosure Of Transactions Between Related Parties Line Items    
Loans and advances to banks € 14,842,000,000 € 13,649,000,000
Loans and Advances to customers 387,212,000,000 382,360,000,000
Deposits from credit institutions 32,356,000,000 28,751,000,000
Customer deposits 402,184,000,000 384,219,000,000
Debt certificates, at amortized cost 64,421,000,000 63,963,000,000
Contingent Commitments 38,563,000,000 39,209,000,000
Financial guarantees given 10,989,000,000 10,984,000,000
Assets Member [Member]    
Disclosure Of Transactions Between Related Parties Line Items    
Loans and advances to banks 61,000,000 26,000,000
Loans and Advances to customers 1,909,000,000 1,682,000,000
Liabilities Member    
Disclosure Of Transactions Between Related Parties Line Items    
Deposits from credit institutions 1,000,000 3,000,000
Customer deposits 859,000,000 453,000,000
Debt certificates, at amortized cost 0 0
Memorandum Accounts [Member]    
Disclosure Of Transactions Between Related Parties Line Items    
Contingent Commitments 156,000,000 166,000,000
Other Commitments Given 1,397,000,000 1,042,000,000
Financial guarantees given € 50,000,000 € 106,000,000