v3.26.1
Investments - Summary of Investments in Real Estate (Detail)
€ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2025
EUR (€)
Dec. 31, 2024
EUR (€)
Dec. 31, 2024
USD ($)
Disclosure of detailed information about investment property [abstract]      
Beginning balance € 514   $ 488
Additions 9 € 24  
Subsequent expenditure capitalized 3 3  
Disposals (39) (34)  
Fair value gains / (losses) 18 10  
Transfers to other headings 1 0  
Net exchange differences (28) 23  
Ending balance € 479 € 514 $ 514