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Note 21 - Financial liabilities at amortized cost - Other financial liabilities (Details) - EUR (€)
€ in Millions
Jun. 30, 2018
Dec. 31, 2017
Other Financial Liabilities Line Items    
Other financial liabilities, at amortized cost € 11,370 € 11,850
Creditors For Other Financial Liabilities Member [Member]    
Other Financial Liabilities Line Items    
Other financial liabilities, at amortized cost 3,193 2,835
Collection Accounts Member [Member]    
Other Financial Liabilities Line Items    
Other financial liabilities, at amortized cost 3,193 3,452
Creditors For Other Payment Obligations Member [Member]    
Other Financial Liabilities Line Items    
Other financial liabilities, at amortized cost 4,984 5,563
Dividend Payable But Pending Payment Member [Member]    
Other Financial Liabilities Line Items    
Other financial liabilities, at amortized cost 0 0
Total [Member]    
Other Financial Liabilities Line Items    
Other financial liabilities, at amortized cost € 11,370 € 11,850