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Segment information and information by geographical area - Revenue (Details) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Geographical areas |  |  |
Sales from operations | € 69,881 | € 75,822 | € 66,919
Italy |  |  |
Geographical areas |  |  |
Sales from operations | 23,312 | 25,279 | 21,925
Other European Union |  |  |
Geographical areas |  |  |
Sales from operations | 18,567 | 20,408 | 19,791
Rest of Europe |  |  |
Geographical areas |  |  |
Sales from operations | 6,931 | 7,052 | 5,911
Americas |  |  |
Geographical areas |  |  |
Sales from operations | 3,842 | 5,051 | 5,154
Asia |  |  |
Geographical areas |  |  |
Sales from operations | 8,102 | 9,585 | 7,523
Africa |  |  |
Geographical areas |  |  |
Sales from operations | 8,998 | 8,246 | 6,428
Other areas |  |  |
Geographical areas |  |  |
Sales from operations | € 129 | € 201 | € 187

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