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Financial risk management - Value at risk (Details) - Currency risk - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Risk management    
Total VaR € 36 € 72
Profit 40 67
OCI 23 18
CTA 0 0
Weighted average    
Risk management    
Total VaR 19 32
Profit 15 25
OCI 21 23
CTA 0 0
Bottom of range    
Risk management    
Total VaR 8 19
Profit 9 12
OCI 11 9
CTA 0 0
Top of range    
Risk management    
Total VaR 36 72
Profit 40 67
OCI 25 40
CTA € 0 € 0