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Note 18 Tax assets and liabilities (Details) - EUR (€)
Jun. 30, 2021
Dec. 31, 2020
Tax assets and liabilities [Line Items]    
Current tax assets € 1,104,000,000 € 1,199,000,000
Deferred tax assets 15,062,000,000 15,327,000,000
Tax assets 16,166,000,000 16,526,000,000
Current tax liabilities 677,000,000 545,000,000
Deferred tax liabilities 1,824,000,000 1,809,000,000
Tax liabilities € 2,501,000,000 € 2,355,000,000