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Note 38 - Dividend income (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dividens Revenue Line Items      
Dividend income € 157 € 334 € 467
Financial assets at fair value through profit or loss classified as held for trading [Member]      
Dividens Revenue Line Items      
Dividend income 19 145 161
Financial Assets At Fair Value Through Other Comprehensive Income Member      
Dividens Revenue Line Items      
Dividend income 138 188 307
Total [Member]      
Dividens Revenue Line Items      
Dividend income € 157 € 334 € 467