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Share-based Payments - Summary of Impact of Changes on Stock Options Expense for Options Granted (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Share Based Payments [Line Items]      
Share-based compensation € 176 € 122 € 88
Volatility Decreased by 10%      
Stock option expense increase (decrease) under the following    assumption changes      
Volatility increase (decrease) by 10% (9)    
Volatility Increase by 10%      
Stock option expense increase (decrease) under the following    assumption changes      
Volatility increase (decrease) by 10% 9    
Expected Life Decrease by 1 Year      
Stock option expense increase (decrease) under the following    assumption changes      
Expected life decrease by 1 year (6)    
Expected Life Increase by 1 Year      
Stock option expense increase (decrease) under the following    assumption changes      
Expected life decrease by 1 year 5    
Options Granted in 2020      
Disclosure Of Share Based Payments [Line Items]      
Share-based compensation € 30