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Non-current and current inventories (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure Of Inventories [Abstract]  
Disclosure Of Detailed Information About Inventories [text block]
(€ million)
 
December 31, 2018 
 
December 31, 2017  
Raw and auxiliary materials and consumables
 
 
889
 
 
 
999
 
Materials and supplies
 
 
1,451
 
 
 
1,566
 
Finished products and goods
 
 
2,274
 
 
 
2,000
 
Certificates and emission rights
 
 
37
 
 
 
56
 
 
 
 
4,651
 
 
 
4,621