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Equity - Items may be reclassified (Details) - EUR (€)
€ in Millions
6 Months Ended
Jun. 30, 2018
Jan. 02, 2018
Dec. 31, 2017
Disclosure of analysis of other comprehensive income by item [line items]      
Loss from revaluation of goodwill € 603    
Financial assets at fair value through other comprehensive income [abstract]      
Net revaluation gains/(losses) 1,037 € 1,253  
Financial assets at fair value through comprehensive income 120,831 126,353  
Revaluation gains     € 2,389
Revaluation losses     (321)
Net revaluation gains/(losses)     2,068
Financial assets available-for-sale     133,271
Debt Securities Plus Loans And Advances [Member]      
Financial assets at fair value through other comprehensive income [abstract]      
Revaluation gains 1,496    
Revaluation losses (458)    
Net revaluation gains/(losses) 1,038    
Financial assets at fair value through comprehensive income 118,065    
Revaluation gains     1,460
Revaluation losses     (306)
Net revaluation gains/(losses)     1,154
Financial assets available-for-sale     128,481
Government debt securities and debt instruments issued by central banks | Spain      
Financial assets at fair value through other comprehensive income [abstract]      
Revaluation gains 802    
Revaluation losses (3)    
Net revaluation gains/(losses) 799    
Financial assets at fair value through comprehensive income 41,153    
Revaluation gains     660
Revaluation losses     (25)
Net revaluation gains/(losses)     635
Financial assets available-for-sale     48,217
Government debt securities and debt instruments issued by central banks | Rest of Europe      
Financial assets at fair value through other comprehensive income [abstract]      
Revaluation gains 345    
Revaluation losses (8)    
Net revaluation gains/(losses) 337    
Financial assets at fair value through comprehensive income 16,307    
Revaluation gains     306
Revaluation losses     (24)
Net revaluation gains/(losses)     282
Financial assets available-for-sale     20,244
Government debt securities and debt instruments issued by central banks | Latin America and rest of the world      
Financial assets at fair value through other comprehensive income [abstract]      
Revaluation gains 274    
Revaluation losses (239)    
Net revaluation gains/(losses) 35    
Financial assets at fair value through comprehensive income 40,442    
Revaluation gains     404
Revaluation losses     (129)
Net revaluation gains/(losses)     275
Financial assets available-for-sale     39,132
Private-sector debt securities      
Financial assets at fair value through other comprehensive income [abstract]      
Revaluation gains 75    
Revaluation losses (208)    
Net revaluation gains/(losses) (133)    
Financial assets at fair value through comprehensive income 20,163    
Revaluation gains     90
Revaluation losses     (128)
Net revaluation gains/(losses)     (38)
Financial assets available-for-sale     20,888
Equity instruments      
Financial assets at fair value through other comprehensive income [abstract]      
Financial assets at fair value through comprehensive income € 2,766 € 3,169  
Revaluation gains     929
Revaluation losses     (15)
Net revaluation gains/(losses)     914
Financial assets available-for-sale     4,790
Domestic | Spain      
Financial assets at fair value through other comprehensive income [abstract]      
Revaluation gains     5
Revaluation losses     (2)
Net revaluation gains/(losses)     3
Financial assets available-for-sale     1,373
International | Rest of Europe      
Financial assets at fair value through other comprehensive income [abstract]      
Revaluation gains     166
Revaluation losses     (2)
Net revaluation gains/(losses)     164
Financial assets available-for-sale     979
International | Latin America and rest of the world      
Financial assets at fair value through other comprehensive income [abstract]      
Revaluation gains     744
Revaluation losses     (6)
Net revaluation gains/(losses)     738
Financial assets available-for-sale     1,878
International | United States      
Financial assets at fair value through other comprehensive income [abstract]      
Revaluation gains     14
Revaluation losses     (5)
Net revaluation gains/(losses)     9
Financial assets available-for-sale     560
Listed      
Financial assets at fair value through other comprehensive income [abstract]      
Revaluation gains     828
Revaluation losses     (5)
Net revaluation gains/(losses)     823
Financial assets available-for-sale     2,900
Unlisted      
Financial assets at fair value through other comprehensive income [abstract]      
Revaluation gains     101
Revaluation losses     (10)
Net revaluation gains/(losses)     91
Financial assets available-for-sale     € 1,890