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Segment information and information by geographical area (Details 2) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure Of Segmental Analysis [Line Items] |  |  |
Net Sales From Operations | € 75,822 | € 66,919 | € 55,762
In Italy [Member] |  |  |
Disclosure Of Segmental Analysis [Line Items] |  |  |
Net Sales From Operations | 25,279 | 21,925 | 21,280
Other European Union [Member] |  |  |
Disclosure Of Segmental Analysis [Line Items] |  |  |
Net Sales From Operations | 20,408 | 19,791 | 15,808
Rest of Europe [Member] |  |  |
Disclosure Of Segmental Analysis [Line Items] |  |  |
Net Sales From Operations | 7,052 | 5,911 | 4,804
Americas [Member] |  |  |
Disclosure Of Segmental Analysis [Line Items] |  |  |
Net Sales From Operations | 5,051 | 5,154 | 3,212
Asia [Member] |  |  |
Disclosure Of Segmental Analysis [Line Items] |  |  |
Net Sales From Operations | 9,585 | 7,523 | 5,619
Africa [Member] |  |  |
Disclosure Of Segmental Analysis [Line Items] |  |  |
Net Sales From Operations | 8,246 | 6,428 | 4,865
Other areas [Member] |  |  |
Disclosure Of Segmental Analysis [Line Items] |  |  |
Net Sales From Operations | € 201 | € 187 | € 174

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