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Employee Benefit Expenses - Summary of Employee Benefit Expenses (Detail) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Classes of employee benefits expense [abstract]      
Wages and salaries € (872) € (841) € (836)
Pension costs - defined benefit plans (28) (33) (31)
Other post-employment benefits (16) (17) (15)
Share-based compensation (8) (6) (5)
Total Employee benefit expenses € (924) € (897) € (887)