v3.25.4
Debt - Long-term debt (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about borrowings [line items]      
Amount outstanding € 8,032 € 7,546  
Current portion 1,098 434  
Long-term debt  € 6,934 € 7,113 € 7,035
Average remaining term (in years) 5 years 4 months 24 days    
Weighted average      
Disclosure of detailed information about borrowings [line items]      
Average remaining term (in years) 5 years 4 months 24 days 5 years 10 months 24 days  
Average rate of interest 3.20% 3.20%  
Between 1 and 5 years      
Disclosure of detailed information about borrowings [line items]      
Long-term debt  € 3,349 € 3,333  
Amount due after 5 years      
Disclosure of detailed information about borrowings [line items]      
Long-term debt  3,584 3,779  
USD bonds      
Disclosure of detailed information about borrowings [line items]      
Amount outstanding 1,135 1,408  
Current portion 108 131  
Long-term debt  € 1,027 € 1,276  
USD bonds | Weighted average      
Disclosure of detailed information about borrowings [line items]      
Average remaining term (in years) 12 years 7 months 6 days 12 years 3 months 18 days  
Average rate of interest 6.20% 6.30%  
USD bonds | Between 1 and 5 years      
Disclosure of detailed information about borrowings [line items]      
Long-term debt  € 0 € 122  
USD bonds | Amount due after 5 years      
Disclosure of detailed information about borrowings [line items]      
Long-term debt  1,027 1,154  
EUR bonds      
Disclosure of detailed information about borrowings [line items]      
Amount outstanding 5,659 4,917  
Current portion 632  
Long-term debt  € 5,027 € 4,917  
EUR bonds | Weighted average      
Disclosure of detailed information about borrowings [line items]      
Average remaining term (in years) 4 years 6 months 4 years 8 months 12 days  
Average rate of interest 2.50% 2.30%  
EUR bonds | Between 1 and 5 years      
Disclosure of detailed information about borrowings [line items]      
Long-term debt  € 2,747 € 2,639  
EUR bonds | Amount due after 5 years      
Disclosure of detailed information about borrowings [line items]      
Long-term debt  2,280 2,278  
Forward contracts      
Disclosure of detailed information about borrowings [line items]      
Amount outstanding 274 148  
Current portion 152 82  
Long-term debt  € 123 € 66  
Forward contracts | Weighted average      
Disclosure of detailed information about borrowings [line items]      
Average remaining term (in years) 1 year 2 months 12 days 1 year 3 months 18 days  
Average rate of interest 0.50% 1.20%  
Forward contracts | Between 1 and 5 years      
Disclosure of detailed information about borrowings [line items]      
Long-term debt  € 123 € 66  
Forward contracts | Amount due after 5 years      
Disclosure of detailed information about borrowings [line items]      
Long-term debt  0 0  
Lease liabilities      
Disclosure of detailed information about borrowings [line items]      
Amount outstanding 963 1,073  
Current portion 207 219  
Long-term debt  € 757 € 854  
Lease liabilities | Weighted average      
Disclosure of detailed information about borrowings [line items]      
Average remaining term (in years) 3 years 6 months 3 years 9 months 18 days  
Average rate of interest 4.00% 3.70%  
Lease liabilities | Between 1 and 5 years      
Disclosure of detailed information about borrowings [line items]      
Long-term debt  € 479 € 506  
Lease liabilities | Amount due after 5 years      
Disclosure of detailed information about borrowings [line items]      
Long-term debt  277 347  
Bank borrowings      
Disclosure of detailed information about borrowings [line items]      
Amount outstanding 1 1  
Current portion 1 1  
Long-term debt  € 0 € 1  
Bank borrowings | Weighted average      
Disclosure of detailed information about borrowings [line items]      
Average remaining term (in years) 1 year 1 year 6 months  
Average rate of interest 1.00% 1.00%  
Bank borrowings | Between 1 and 5 years      
Disclosure of detailed information about borrowings [line items]      
Long-term debt  € 0 € 1  
Bank borrowings | Amount due after 5 years      
Disclosure of detailed information about borrowings [line items]      
Long-term debt  0 0  
Other long-term debt      
Disclosure of detailed information about borrowings [line items]      
Amount outstanding 0 0  
Current portion 0 0  
Long-term debt  € 0 € 0  
Other long-term debt | Weighted average      
Disclosure of detailed information about borrowings [line items]      
Average remaining term (in years) 3 years 7 months 6 days 3 years 2 months 12 days  
Average rate of interest 1.30% 1.20%  
Other long-term debt | Between 1 and 5 years      
Disclosure of detailed information about borrowings [line items]      
Long-term debt  € 0 € 0  
Other long-term debt | Amount due after 5 years      
Disclosure of detailed information about borrowings [line items]      
Long-term debt  € 0 € 0