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Financial risk management - Value at risk (Details) - Currency risk - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
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%  
Total VaR € 8 € 16
Impact on profit 10 21
Impact on OCI 18 33
Impact on CTA   6
Average for the year    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Total VaR 11 14
Impact on profit 10 18
Impact on OCI 22 38
Impact on CTA € 1 5
Minimum    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Total VaR   5
Maximum    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Total VaR   € 24