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Financial risk management - Value at risk (Details) - Currency risk - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
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 € 9 € 8
Impact on profit 15 10
Impact on OCI 21 18
Average for the year    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Total VaR 9 11
Impact on profit 18 10
Impact on OCI 30 22
Impact on CTA   1
Minimum    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Total VaR 6 7
Impact on profit 8 4
Impact on OCI 15 13
Impact on CTA 0 0
Maximum    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Total VaR 18 25
Impact on profit 32 17
Impact on OCI 41 31
Impact on CTA € 0 € 4