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Deferred tax assets and liabilities (Details) - EUR (€)
€ in Millions
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets and liabilities    
Deferred tax liabilities before offsetting € 8,581 € 9,583
Deferred tax assets available for offset (3,057) (4,663)
Deferred tax liabilities 5,524 4,920
Deferred tax assets before offsetting (net of accumulated write-down provisions) 7,166 9,023
Deferred tax liabilities available for offset (3,057) (4,663)
Deferred tax assets € 4,109 € 4,360