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Inventories (Details) - EUR (€)
€ in Millions
Dec. 31, 2017
Dec. 31, 2016
InventoriesLineItems [Line Items]    
Raw and auxiliary materials and consumables € 2,565 € 2,588
Products being processed and semi-finished products 140 109
Work in progress 1 2
Finished products and goods 1,859 1,869
Certificates and emission rights 56 69
Current inventories 4,621 4,637
Crude oil, gas and petroleum products [member]    
InventoriesLineItems [Line Items]    
Raw and auxiliary materials and consumables 785 550
Products being processed and semi-finished products 133 99
Finished products and goods 1,287 1,394
Current inventories 2,205 2,043
Chemical products [member]    
InventoriesLineItems [Line Items]    
Raw and auxiliary materials and consumables 140 135
Products being processed and semi-finished products 7 9
Finished products and goods 489 389
Current inventories 636 533
Other [Member]    
InventoriesLineItems [Line Items]    
Raw and auxiliary materials and consumables 1,640 1,903
Products being processed and semi-finished products   1
Work in progress 1 2
Finished products and goods 83 86
Certificates and emission rights 56 69
Current inventories € 1,780 € 2,061