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Information by industry segment and by geographical area (Details 2) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
DisclosureOfSegmentalAnalysisLineItems [Line Items]      
Net sales from operations € 66,919 € 55,762 € 72,286
Italy [Member]      
DisclosureOfSegmentalAnalysisLineItems [Line Items]      
Net sales from operations 21,925 21,280 24,405
Other European [Member]      
DisclosureOfSegmentalAnalysisLineItems [Line Items]      
Net sales from operations 19,791 15,808 20,730
Rest of Europe [Member]      
DisclosureOfSegmentalAnalysisLineItems [Line Items]      
Net sales from operations 5,911 4,804 7,125
Americas [Member]      
DisclosureOfSegmentalAnalysisLineItems [Line Items]      
Net sales from operations 5,154 3,212 4,217
Asia [Member]      
DisclosureOfSegmentalAnalysisLineItems [Line Items]      
Net sales from operations 7,523 5,619 9,086
Africa [Member]      
DisclosureOfSegmentalAnalysisLineItems [Line Items]      
Net sales from operations 6,428 4,865 6,482
Other areas [Member]      
DisclosureOfSegmentalAnalysisLineItems [Line Items]      
Net sales from operations € 187 € 174 € 241