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Risk management - Value at risk (Details) - Currency risk - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Percentage of confidence level to determine value at risk 95.00%  
Holding period of value at risk 1 month  
Probability percentage that potential loss not exceed value at risk 95.00%  
Probability percentage that potential loss will be at minimum equal to value at risk 5.00%  
VaR from financial instruments € 144 € 83
Average for the year    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
VaR from financial instruments 205 111
Minimum    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
VaR from financial instruments 144 73
Maximum    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
VaR from financial instruments € 267 € 149