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Inventories - Summary of Inventories (Detail) - EUR (€)
€ in Millions
Dec. 31, 2017
Dec. 31, 2016
Classes of current inventories [Abstract]    
Raw materials and consumables € 1,274 € 1,385
Finished goods and goods for resale 2,688 2,893
Total inventories € 3,962 € 4,278