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Income taxes - Components (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Components of the income tax (expense)/benefit      
Current tax € (261) € (534) € (258)
Deferred tax (666) 991 (88)
Total € (927) € 457 € (346)