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Information by industry segment and by geographical area (Details 2) - EUR (€) € in Millions | 12 Months Ended
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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

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