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Income taxes - Components (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Components of the income tax (expense)/benefit      
Current tax € (530) € (261) € (534)
Deferred tax 341 (666) 991
Total € (189) € (927) € 457