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Note 21 - Financial liabilities at amortized cost - Other financial liabilities (Details) - EUR (€)
Jun. 30, 2020
Dec. 31, 2019
Other Financial Liabilities Line Items    
Other financial liabilities, at amortized cost € 14,085,000,000 € 13,758,000,000
LiabilitiesForLease [Member]    
Other Financial Liabilities Line Items    
Other financial liabilities, at amortized cost 3,129,000,000 3,335,000,000
Creditors For Other Financial Liabilities Member [Member]    
Other Financial Liabilities Line Items    
Other financial liabilities, at amortized cost 2,887,000,000 2,623,000,000
Collection Accounts Member [Member]    
Other Financial Liabilities Line Items    
Other financial liabilities, at amortized cost 3,532,000,000 3,306,000,000
Creditors For Other Payment Obligations Member [Member]    
Other Financial Liabilities Line Items    
Other financial liabilities, at amortized cost € 4,538,000,000 € 4,494,000,000