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Financial risk management - Schedule of VaR from financial instruments (Details) - Currency risk - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Risk management    
Total VaR € 12 € 36
Profit 10 40
OCI 15 23
CTA 0 0
Weighted average    
Risk management    
Total VaR 25 19
Profit 19 15
OCI 37 21
CTA 0 0
Bottom of range    
Risk management    
Total VaR 12 8
Profit 10 9
OCI 13 11
CTA 0 0
Top of range    
Risk management    
Total VaR 41 36
Profit 34 40
OCI 56 25
CTA € 0 € 0