v3.25.4
Share-based compensation - Outstanding options (Detail)
€ in Millions
12 Months Ended
Dec. 31, 2025
EUR (€)
shares
Dec. 31, 2024
EUR (€)
shares
Dec. 31, 2023
shares
EUR-denominated      
Share-based compensation [Line Items]      
Number of share options (in shares) | shares 2,966,493 3,396,539 3,660,000
Intrinsic value | € € 3 € 8  
Weighted average remaining contractual term in years 6 years 8 months 12 days 8 years 1 month 6 days  
US Dollar      
Share-based compensation [Line Items]      
Number of share options (in shares) | shares 1,381,643 1,637,764 1,929,000
Intrinsic value | € € 4 € 1  
Weighted average remaining contractual term in years 5 years 9 months 18 days 8 years