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Other disclosures - Spain Real Estate Business Segment Information (Details) - EUR (€)
€ in Millions
Jun. 30, 2020
Dec. 31, 2019
Memorandum items: Data from the public consolidated balance sheet    
Total assets € 1,572,881 € 1,522,695
Spain    
Memorandum items: Data from the public consolidated balance sheet    
Total assets 1,572,881  
Spain | Accumulated impairment    
Memorandum items: Data from the public consolidated balance sheet    
Financial assets 1,727  
Spain | Customers excluding the public sector    
Memorandum items: Data from the public consolidated balance sheet    
Total loans and advances to customers excluding the public sector (business in Spain) € 247,029