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Note 21 Other Financial Liabilities (Details) - EUR (€)
Jun. 30, 2021
Dec. 31, 2020
Other financial liabilities [Line Items]    
Other financial liabilities € 14,132,000,000 € 13,358,000,000
Lease liabilities [member]    
Other financial liabilities [Line Items]    
Other financial liabilities 2,586,000,000 2,674,000,000
Creditors for other financial liabilities [Member]    
Other financial liabilities [Line Items]    
Other financial liabilities 3,048,000,000 2,408,000,000
Collection accounts [Member]    
Other financial liabilities [Line Items]    
Other financial liabilities 3,994,000,000 3,276,000,000
Creditors for other payment obligations [Member]    
Other financial liabilities [Line Items]    
Other financial liabilities € 4,504,000,000 € 5,000,000,000