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Inventories - Summary of Inventories (Detail) - EUR (€) € in Millions | Dec. 31, 2017 | Dec. 31, 2016
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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

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