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Deferred tax assets and liabilities (Details) - EUR (€)
€ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Deferred Taxes Liabilities [Abstract]      
Deferred tax liabilities, gross € 7,956 € 10,169 € 10,953
Deferred tax assets available for offset (3,684) (4,269)  
Deferred tax liabilities 4,272 5,900  
Deferred tax assets, gross (net of accumulated write-down provisions) 7,615 8,347  
Deferred tax liabilities available for offset (3,684) (4,269)  
Deferred tax assets € 3,931 € 4,078