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Note 26 Retained Earnings And Other Reserves (Details) - EUR (€)
Jun. 30, 2021
Dec. 31, 2020
Disclosure of Retained earnings and other reserves [Line Items]    
Retained earnings € 31,320,000,000 € 30,508,000,000
Other reserves (239,000,000) (164,000,000)
Retained earnings and other reserves € 31,082,000,000 € 30,344,000,000