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Risk management - Spain Real Estate Business Segment Information (Details) - EUR (€)
€ in Millions
Jun. 30, 2018
Jan. 02, 2018
Dec. 31, 2017
Memorandum items: Data from the public consolidated balance sheet      
Total assets € 1,433,833 € 1,443,069 € 1,444,305
Impairment losses      
Memorandum items: Data from the public consolidated balance sheet      
Financial assets (24,949)    
Spain      
Memorandum items: Data from the public consolidated balance sheet      
Total assets 1,433,833    
Spain | Impairment losses      
Memorandum items: Data from the public consolidated balance sheet      
Financial assets (1,628)    
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) € 247,796