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Inventories - Disclosure of Inventories (Detail) - EUR (€)
€ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Classes of current inventories [abstract]    
Finished goods € 186 € 165
Work in progress 346 347
Raw materials 137 112
Stores and supplies 75 67
Inventories write down (31) (31)
Total Inventories € 713 € 660