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Inventories (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Inventories      
Raw materials, supplies and other € 568 € 462  
Work in progress 1,281 1,398  
Finished goods 1,087 1,308  
Total 2,936 3,168  
Cost of inventories recognized as an expense € 8,181 € 7,569 € 7,803