v3.25.0.1
Share-based compensation - Summary of Impact of Changes on Stock Options Expense for Options Granted (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure Of Share Based Payments [Line Items]      
Share-based compensation € 267 € 321 € 381
Volatility decreased by 10%      
Stock option expense increase/(decrease) under the following    assumption changes      
Volatility increase (decrease) by 10% (4)    
Volatility increase by 10%      
Stock option expense increase/(decrease) under the following    assumption changes      
Volatility increase (decrease) by 10% 4    
Expected life decrease by 1 year      
Stock option expense increase/(decrease) under the following    assumption changes      
Expected life increase (decrease) by 1 year (5)    
Expected life increase by 1 year      
Stock option expense increase/(decrease) under the following    assumption changes      
Expected life increase (decrease) by 1 year 4    
Options Granted in 2020      
Disclosure Of Share Based Payments [Line Items]      
Share-based compensation € 30