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Employee Benefit Expenses - Summary of Employee Benefit Expenses (Detail) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Classes of employee benefits expense [abstract]      
Wages and salaries € (889) € (872) € (841)
Pension costs-defined benefit plans (20) (21) (22)
Other post-employment benefits (6) (6) (7)
Share-based compensation (12) (8) (6)
Total employee benefit expenses € (927) € (907) € (876)