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Commissions and Expenses - Summary of Employee Expenses (Detail) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Classes of employee benefits expense [abstract]      
Salaries € 1,321 € 1,261 € 1,470
Post-employment benefit costs 287 277 318
Social security charges 127 120 151
Other personnel costs 378 367 267
Shares 36 36 28
Total € 2,149 € 2,061 € 2,234