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Segment information and information by geographical area (Details 1) - EUR (€)
€ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Segmental Analysis [Line Items]      
Identifiable assets [1] € 85,483 € 89,816 € 99,068
Capital expenditure in tangible and intangible assets 9,119 8,681 9,180
In Italy [Member]      
Disclosure Of Segmental Analysis [Line Items]      
Identifiable assets [1] 18,646 18,449 18,769
Capital expenditure in tangible and intangible assets 1,424 1,090 1,163
Other European Union [Member]      
Disclosure Of Segmental Analysis [Line Items]      
Identifiable assets [1] 7,086 7,706 7,370
Capital expenditure in tangible and intangible assets 267 316 331
Rest of Europe [Member]      
Disclosure Of Segmental Analysis [Line Items]      
Identifiable assets [1] 1,031 6,160 6,960
Capital expenditure in tangible and intangible assets 538 387 460
Americas [Member]      
Disclosure Of Segmental Analysis [Line Items]      
Identifiable assets [1] 4,546 4,406 5,397
Capital expenditure in tangible and intangible assets 534 278 233
Asia [Member]      
Disclosure Of Segmental Analysis [Line Items]      
Identifiable assets [1] 16,910 16,527 19,471
Capital expenditure in tangible and intangible assets 1,782 898 1,978
Africa [Member]      
Disclosure Of Segmental Analysis [Line Items]      
Identifiable assets [1] 36,155 35,385 39,812
Capital expenditure in tangible and intangible assets 4,533 5,699 5,004
Other areas [Member]      
Disclosure Of Segmental Analysis [Line Items]      
Identifiable assets [1] 1,109 1,183 1,289
Capital expenditure in tangible and intangible assets € 41 € 13 € 11
[1] Includes assets directly associated with the generation of operating profit.