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INVENTORIES (Details) - EUR (€)
€ in Millions
Dec. 31, 2020
Dec. 31, 2019
Subclassifications of assets, liabilities and equities [abstract]    
Finished goods € 149 € 203
Work in progress 280 321
Raw materials 118 106
Stores and supplies 80 74
Inventories write down (45) (34)
Total inventories € 582 € 670