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Short-term debt (Details 1) - EUR (€)
€ in Millions
Dec. 31, 2017
Dec. 31, 2016
DisclosureOfShorttermDebtLineItems [Line Items]    
Short-term Debt € 2,242 € 3,396
Euro [Member]    
DisclosureOfShorttermDebtLineItems [Line Items]    
Short-term Debt 904 1,405
U.S. dollar [Member]    
DisclosureOfShorttermDebtLineItems [Line Items]    
Short-term Debt 1,329 1,982
Other currencies [Member]    
DisclosureOfShorttermDebtLineItems [Line Items]    
Short-term Debt € 9 € 9