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Inventories - Disclosure of Inventories (Detail) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Classes of current inventories [abstract]    
Finished goods € 165 € 164
Work in progress 347 332
Raw materials 112 111
Stores and supplies 67 64
Inventories write down (31) (28)
Total inventories € 660 € 643