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Segment information and information by geographical area (Details 2) - EUR (€)
€ in Millions
 12 Months Ended
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