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Other comprehensive income - Items not reclassified: equity instruments (Details) - EUR (€)
€ in Millions
Jun. 30, 2019
Dec. 31, 2018
Disclosure of analysis of other comprehensive income by item [line items]    
Net revaluation gains (losses) € 527 € 597
Equity instruments    
Disclosure of analysis of other comprehensive income by item [line items]    
Revaluation gains 1,052 897
Revaluation losses (525) (300)
Net revaluation gains (losses) 527 597
Fair value 2,789 2,671
Domestic | SPAIN    
Disclosure of analysis of other comprehensive income by item [line items]    
Revaluation gains 19 20
Revaluation losses (444) (216)
Net revaluation gains (losses) (425) (196)
Fair value 185 417
International | Rest of Europe    
Disclosure of analysis of other comprehensive income by item [line items]    
Revaluation gains 60 160
Revaluation losses (78) (76)
Net revaluation gains (losses) (18) 84
Fair value 319 652
International | UNITED STATES    
Disclosure of analysis of other comprehensive income by item [line items]    
Revaluation gains 13 9
Net revaluation gains (losses) 13 9
Fair value 45 42
International | Latin America and rest of the world    
Disclosure of analysis of other comprehensive income by item [line items]    
Revaluation gains 960 708
Revaluation losses (3) (8)
Net revaluation gains (losses) 957 700
Fair value 2,240 1,560
Listed    
Disclosure of analysis of other comprehensive income by item [line items]    
Revaluation gains 961 818
Revaluation losses (15) (18)
Net revaluation gains (losses) 946 800
Fair value 2,289 1,943
Unlisted    
Disclosure of analysis of other comprehensive income by item [line items]    
Revaluation gains 91 79
Revaluation losses (510) (282)
Net revaluation gains (losses) (419) (203)
Fair value € 500 € 728