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Other comprehensive income - Items may be reclassified: debt and equity instruments (Details) - EUR (€)
€ in Millions
6 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Disclosure of analysis of other comprehensive income by item [line items]    
Gain from revaluation of goodwill € 144  
Financial assets at fair value through other comprehensive income [abstract]    
Net revaluation gains/(losses) 2,051 € 828
Financial assets at fair value through comprehensive income 118,062 121,091
Impairment loss (reversal) 4,368  
Debt Securities Plus Loans And Advances [Member]    
Financial assets at fair value through other comprehensive income [abstract]    
Revaluation gains 2,191  
Revaluation losses (140)  
Net revaluation gains/(losses) 2,051  
Financial assets at fair value through comprehensive income 115,273  
Revaluation gains   1,181
Revaluation losses   (353)
Net revaluation gains/(losses)   828
Financial assets available-for-sale   118,420
Government debt securities and debt instruments issued by central banks | SPAIN    
Financial assets at fair value through other comprehensive income [abstract]    
Revaluation gains 717  
Revaluation losses (4)  
Net revaluation gains/(losses) 713  
Financial assets at fair value through comprehensive income 29,002  
Revaluation gains   323
Revaluation losses   (3)
Net revaluation gains/(losses)   320
Financial assets available-for-sale   38,550
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 679  
Revaluation losses (32)  
Net revaluation gains/(losses) 647  
Financial assets at fair value through comprehensive income 20,039  
Revaluation gains   373
Revaluation losses   (55)
Net revaluation gains/(losses)   318
Financial assets available-for-sale   17,494
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 715  
Revaluation losses (42)  
Net revaluation gains/(losses) 673  
Financial assets at fair value through comprehensive income 44,820  
Revaluation gains   448
Revaluation losses   (117)
Net revaluation gains/(losses)   331
Financial assets available-for-sale   42,599
Private-sector debt securities    
Financial assets at fair value through other comprehensive income [abstract]    
Revaluation gains 80  
Revaluation losses (62)  
Net revaluation gains/(losses) 18  
Financial assets at fair value through comprehensive income 21,412  
Revaluation gains   37
Revaluation losses   (178)
Net revaluation gains/(losses)   (141)
Financial assets available-for-sale   19,777
Debt instruments asset    
Financial assets at fair value through other comprehensive income [abstract]    
Financial assets at fair value through comprehensive income 111,891 116,819
Equity instruments    
Financial assets at fair value through other comprehensive income [abstract]    
Financial assets at fair value through comprehensive income 2,789 € 2,671
Financial assets at fair value through other comprehensive income, category    
Financial assets at fair value through other comprehensive income [abstract]    
Impairment loss (reversal) € 6