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Cash and Cash Equivalents - Summary of Detailed Information about Cash and Cash Equivalents (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Cash and cash equivalents [abstract]        
Cash at bank and in hand € 1,165 € 1,478 € 1,614  
Short-term deposits 315 152 340  
Money market investments 1,253 1,838 2,120  
On December 31 2,733 3,469 4,074 € 8,486
Cash collateral related to securities lending, repurchase agreements and margins on derivatives transactions 1,972 2,240 3,416  
Income from security lending programs € 3 € 4 € 7  
Weighted effective interest rate on short-term deposits 2.13% 3.17% 3.90%  
Average maturity on short-term deposits (in days) 2 days 5 days 11 days