v3.26.1
Financial Instruments - Currency Risk (Details)
€ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2025
EUR (€)
$ / €
Dec. 31, 2024
EUR (€)
$ / €
Dec. 31, 2025
USD ($)
$ / €
Dec. 31, 2024
USD ($)
$ / €
US dollar        
Sensitivity analysis        
Closing exchange rate | $ / € 1.175 1.039 1.175 1.039
Currency risk | Euro        
Financial instrument risk        
Balance sheet exposure € 390 € (316)    
Sensitivity analysis        
Percentage of outstanding debt 68.00% 66.00%    
Borrowings € 5,809 € 5,924    
Currency risk | Euro | Trade receivables        
Financial instrument risk        
Balance sheet exposure 1 3    
Currency risk | Euro | Receivables from Group companies        
Financial instrument risk        
Balance sheet exposure 110 119    
Currency risk | Euro | Loans to Group companies        
Financial instrument risk        
Balance sheet exposure 5,605 4,644    
Currency risk | Euro | Cash and cash equivalents        
Financial instrument risk        
Balance sheet exposure 86 453    
Currency risk | Euro | Trade payables.        
Financial instrument risk        
Balance sheet exposure (25) (22)    
Currency risk | Euro | Payables to Group companies        
Financial instrument risk        
Balance sheet exposure (86) (74)    
Currency risk | Euro | Loans from Group companies        
Financial instrument risk        
Balance sheet exposure € (5,301) (5,428)    
Currency risk | Euro | Bank loans        
Financial instrument risk        
Balance sheet exposure   (11)    
Currency risk | US dollar        
Financial instrument risk        
Balance sheet exposure | $     $ 584 $ 46
Sensitivity analysis        
Rate increase (as a percent) 10.00%   10.00%  
Increase in equity if exchange rate strengthened € 723 1,068    
Increase (decrease) in profit due to foreign exchange differences if exchange rate strengthened € 97 € (27)    
Rate decrease (as a percent) 10.00% 10.00% 10.00% 10.00%
Currency risk | US dollar | Trade receivables        
Financial instrument risk        
Balance sheet exposure | $     $ 27 $ 72
Currency risk | US dollar | Receivables from Group companies        
Financial instrument risk        
Balance sheet exposure | $     14 16
Currency risk | US dollar | Loans to Group companies        
Financial instrument risk        
Balance sheet exposure | $     604  
Currency risk | US dollar | Cash and cash equivalents        
Financial instrument risk        
Balance sheet exposure | $     11 26
Currency risk | US dollar | Trade payables.        
Financial instrument risk        
Balance sheet exposure | $     (20) (17)
Currency risk | US dollar | Payables to Group companies        
Financial instrument risk        
Balance sheet exposure | $     $ (52) (45)
Currency risk | US dollar | Loans from Group companies        
Financial instrument risk        
Balance sheet exposure | $       $ (6)