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Inventories - Disclosure of Inventories (Detail) - EUR (€)
€ in Millions
Dec. 31, 2017
Dec. 31, 2016
Classes of current inventories [abstract]    
Finished goods € 164 € 149
Work in progress 332 299
Raw materials 111 94
Stores and supplies 64 69
Adjustments (28) (20)
Total inventories € 643 € 591