v3.26.1
Financial Instruments - Interest Rate Risk (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Sensitivity analysis    
Treasury stock as a percentage of capital 1.02% 1.04%
Interest rate risk    
Financial instrument risk    
Financial liabilities € 8,527 € 8,971
Sensitivity analysis    
Higher rate increment (as a percent) 1.00%  
Increase in interest expense if rate had been higher € 22 30
Interest rate risk | Fixed-interest    
Financial instrument risk    
Financial liabilities € 6,250 € 6,430
Percentage of outstanding debt 73.00% 71.00%
Interest rate risk | Variable-interest    
Financial instrument risk    
Financial liabilities € 2,277 € 2,541
Percentage of outstanding debt 27.00% 29.00%