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Note 12 - 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
 6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Financial Assets At Fair Value Through Other Comprehensive Income Abstract    
Financial Assets At Fair Value Through Other Comprehensive Income balance at the Beginning € 1,641 € 947
Changes In Accumulated Other Comprehensive Income Available For Sale Abstract    
Effects of changes in accounting policies IFRS 9 (142) 0
Valuation gains and losses (271) 321
Amounts transferred to income (84) 356
Other reclassifications financial assets at fair value 0 (10)
Income tax financial assets at fair value 89 27
Financial Assets At Fair Value Through Other Comprehensive Income balance at the End € 1,233 € 1,641