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Note 46 - Related-Party Transactions - Balances Arising From Transactions With Entities Of The Group (Details) - EUR (€)
€ in Millions
Jun. 30, 2018
Dec. 31, 2017
Disclosure Of Transactions Between Related Parties Line Items    
Loans and advances to banks € 11,783 € 26,261
Loans and Advances to customers 377,175 387,621
Deposits from credit institutions 33,307 54,516
Customer deposits 367,312 376,379
Debt certificates, at amortized cost 62,349 63,915
Financial guarantees given 15,467 16,545
Contingent Commitments 37,638 45,738
Assets Member [Member]    
Disclosure Of Transactions Between Related Parties Line Items    
Loans and advances to banks 67 91
Loans and Advances to customers 578 510
Liabilities Member    
Disclosure Of Transactions Between Related Parties Line Items    
Deposits from credit institutions 1 5
Customer deposits 334 428
Debt certificates, at amortized cost 0 0
Memorandum Accounts [Member]    
Disclosure Of Transactions Between Related Parties Line Items    
Financial guarantees given 1,386 1,254
Contingent Commitments € 104 € 114