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Note 15 Investments In Subsidiaries Joint Ventures And Associates (Details) - EUR (€)
Jun. 30, 2021
Dec. 31, 2020
Disclosure of Investments in subsidiaries joint ventures and associates [Line Items]    
Investments in joint ventures € 147,000,000 € 149,000,000
Investments in associates 1,253,000,000 1,288,000,000
Investments in subsidiaries, joint ventures and associates € 1,400,000,000 € 1,437,000,000