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Inventories - Summary of Inventories (Detail) - EUR (€) € in Millions | Dec. 31, 2018 | Dec. 31, 2017
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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

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