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Note 22 - Financial liabilities at amortized cost - Other financial liabilities (Details) - EUR (€)
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Other Financial Liabilities Line Items      
Other financial liabilities, at amortized cost € 13,358,000,000 € 13,758,000,000 € 12,844,000,000
LiabilitiesForLease [Member]      
Other Financial Liabilities Line Items      
Other financial liabilities, at amortized cost 2,674,000,000 3,335,000,000  
Creditors For Other Financial Liabilities Member [Member]      
Other Financial Liabilities Line Items      
Other financial liabilities, at amortized cost 2,408,000,000 2,623,000,000 2,891,000,000
Collection Accounts Member [Member]      
Other Financial Liabilities Line Items      
Other financial liabilities, at amortized cost 3,275,000,000 3,306,000,000 4,305,000,000
Creditors For Other Payment Obligations Member [Member]      
Other Financial Liabilities Line Items      
Other financial liabilities, at amortized cost € 5,000,000,000 € 4,494,000,000 € 5,648,000,000