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Note 8 Cash Cash Balances At Central Banks And Other Demand Deposits (Details) - EUR (€)
Jun. 30, 2021
Dec. 31, 2020
Cash Cash balances at central banks and other demand deposits [Line Items]    
Cash and cash equivalents € 5,872,000,000 € 6,447,000,000
Cash and bank balances at central banks 50,154,000,000 53,079,000,000
Other financial assets 5,661,000,000 5,994,000,000
Total Cash and cash equivalents € 61,687,000,000 € 65,520,000,000