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Note 33 Dividend income breakdown by headline (Details) - EUR (€)
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Financial assets at fair value through profit or loss, category [member]    
Dividend Income Breakdown By Headline [Line Items]    
Dividend income € 59,000,000 € 7,000,000
Financial assets at fair value through other comprehensive income, category [member]    
Dividend Income Breakdown By Headline [Line Items]    
Dividend income 66,000,000 68,000,000
Total [Member]    
Dividend Income Breakdown By Headline [Line Items]    
Dividend income € 125,000,000 € 74,000,000