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Risk management - Spain Real Estate Business Segment Information (Details) - EUR (€)
€ in Millions
Jun. 30, 2019
Dec. 31, 2018
Memorandum items: Data from the public consolidated balance sheet    
Total assets € 1,512,096 € 1,459,271
SPAIN    
Memorandum items: Data from the public consolidated balance sheet    
Total assets 1,512,096  
SPAIN | Accumulated impairment    
Memorandum items: Data from the public consolidated balance sheet    
Financial assets (1,221)  
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) € 224,086