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Inventory - compulsory stock (Details Textual) - EUR (€)
€ in Millions
Dec. 31, 2017
Dec. 31, 2016
DisclosureOfInventoryCompulsoryStockLineItems [Line Items]    
Non-current inventories € 1,283 € 1,184
Italian subsidiaries [Member]    
DisclosureOfInventoryCompulsoryStockLineItems [Line Items]    
Non-current inventories € 1,267 € 1,167