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Financial Assets and Liabilities - Long-term Credits (Details) - EUR (€)
€ in Millions
Dec. 31, 2017
Dec. 31, 2016
Financial Instruments [Abstract]    
Long-term trade receivables € 638 € 593
Long-term receivables for indirect taxes 189 144
Other long-term credits 995 1,033
Total € 1,822 € 1,770