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Inventories - Summary of Inventories (Detail) - EUR (€)
€ in Millions
Dec. 31, 2018
Dec. 31, 2017
Classes of current inventories [abstract]    
Raw materials and consumables € 1,365 € 1,274
Finished goods and goods for resale 2,936 2,688
Total inventories € 4,301 € 3,962