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Personnel expenses - Summary of Personnel Expense (Detail)
€ in Millions
12 Months Ended
Dec. 31, 2020
EUR (€)
employee
Dec. 31, 2019
EUR (€)
employee
Dec. 31, 2018
EUR (€)
employee
Classes of employee benefits expense [abstract]      
Wages and salaries € 694 € 541 € 409
Social costs 265 111 90
Contributions to retirement plans 32 26 20
Share-based compensation 176 122 88
Other employee benefits 97 88 60
Personnel expenses € 1,264 € 888 € 667
Average full-time employees | employee 5,584 4,405 3,651