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Personnel expenses - Summary of Personnel Expense (Detail)
€ in Millions
12 Months Ended
Dec. 31, 2021
EUR (€)
employee
Dec. 31, 2020
EUR (€)
employee
Dec. 31, 2019
EUR (€)
employee
Classes of employee benefits expense [abstract]      
Wages and salaries € 860 € 694 € 541
Social costs 85 265 111
Contributions to retirement plans 40 32 26
Share-based compensation 223 176 122
Other employee benefits 124 97 88
Total € 1,332 € 1,264 € 888
Average full-time employees | employee 6,617 5,584 4,405