v3.26.1
Borrowings - Additional Information (Detail) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 10, 2025
Dec. 31, 2024
Disclosure of detailed information about borrowings [Line Items]      
Difference between the contractually required payment at maturity date and the carrying amount   € 6 € 8
Undrawn committed borrowing facilities € 1,351   1,544
Floating interest rate [member] | Later than one year [member]      
Disclosure of detailed information about borrowings [Line Items]      
Undrawn committed borrowing facilities 1,351   € 1,544
Operational funding [member]      
Disclosure of detailed information about borrowings [Line Items]      
Increase (decrease) in borrowing capacity € 895