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Share-based compensation - Summary of Impact of Changes on Stock Options Expense for Options Granted (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Share Based Payments [Line Items]      
Share-based compensation € 223 € 176 € 122
Volatility decreased by 10%      
Stock option expense increase/(decrease) under the following    assumption changes      
Volatility increase (decrease) by 10% (13)    
Volatility increase by 10%      
Stock option expense increase/(decrease) under the following    assumption changes      
Volatility increase (decrease) by 10% 16    
Expected life decrease by 1 year      
Stock option expense increase/(decrease) under the following    assumption changes      
Expected life increase (decrease) by 1 year (8)    
Expected life increase by 1 year      
Stock option expense increase/(decrease) under the following    assumption changes      
Expected life increase (decrease) by 1 year 9    
Options Granted in 2020      
Disclosure Of Share Based Payments [Line Items]      
Share-based compensation € 56