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Note 13 - Financial assets at fair value through other comprehensive income - Accumulated other comprehensive income items that may be reclassified to profit or loss available for sale financial assets (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Debt Securities [Member]      
Financial assets at fair value throught other comprehensive income Line Items      
Financial Assets At Fair Value Through Other Comprehensive Income balance at the Beginning € 1,557    
Changes In Accumulated Other Comprehensive Income Available For Sale Abstract      
Effects of changes in accounting policies IFRS 9 (58)    
Valuation gains and losses (640)    
Amounts transferred to income (137)    
Other reclassifications financial assets at fair value 0    
Income tax financial assets at fair value 221    
Financial Assets At Fair Value Through Other Comprehensive Income balance at the End 943 € 1,557  
Equity Instruments at fair value [Member]      
Financial assets at fair value throught other comprehensive income Line Items      
Financial Assets At Fair Value Through Other Comprehensive Income balance at the Beginning 84    
Changes In Accumulated Other Comprehensive Income Available For Sale Abstract      
Effects of changes in accounting policies IFRS 9 (40)    
Valuation gains and losses (174)    
Amounts transferred to income 0    
Other reclassifications financial assets at fair value 0    
Income tax financial assets at fair value (25)    
Financial Assets At Fair Value Through Other Comprehensive Income balance at the End (155) 84  
Equity Instruments Available for sale [Member]      
Financial assets at fair value throught other comprehensive income Line Items      
Financial Assets At Fair Value Through Other Comprehensive Income balance at the Beginning € 1,641 947 € 1,674
Changes In Accumulated Other Comprehensive Income Available For Sale Abstract      
Valuation gains and losses   321 400
Amounts transferred to income   356 (1,181)
Other reclassifications financial assets at fair value   (10) 116
Income tax financial assets at fair value   27 (62)
Financial Assets At Fair Value Through Other Comprehensive Income balance at the End   € 1,641 € 947