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Segment information and information by geographical area - Revenue (Details) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Geographical areas |  |  |
Sales from operations | € 43,987 | € 69,881 | € 75,822
Italy |  |  |
Geographical areas |  |  |
Sales from operations | 14,717 | 23,312 | 25,279
Other European Union |  |  |
Geographical areas |  |  |
Sales from operations | 9,508 | 18,567 | 20,408
Revenues relating to United Kingdom included in other geographical areas |  | 6,856 | 6,286
Rest of Europe |  |  |
Geographical areas |  |  |
Sales from operations | 8,191 | 6,931 | 7,052
Revenues relating to United Kingdom included in other geographical areas | 4,410 |  |
Americas |  |  |
Geographical areas |  |  |
Sales from operations | 2,426 | 3,842 | 5,051
Asia |  |  |
Geographical areas |  |  |
Sales from operations | 4,182 | 8,102 | 9,585
Africa |  |  |
Geographical areas |  |  |
Sales from operations | 4,842 | 8,998 | 8,246
Other areas |  |  |
Geographical areas |  |  |
Sales from operations | € 121 | € 129 | € 201

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- Definition Amount of revenues from contract with customers relating to the United Kingdom included in other geographical areas. + References No definition available. + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The amount of revenue from contracts with customers. A customer is a party that has contracted with an entity to obtain goods or services that are an output of the entity’s ordinary activities in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2020-01-01 -Paragraph 113 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2020-en-r&anchor=para_113_a&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2020-01-01 -Paragraph 114 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2020-en-r&anchor=para_114&doctype=Standard -URIDate 2020-01-01 + Details
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- Details
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- Details
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- Details
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