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Revenues (Details) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure Of Revenue Explanatory [Abstract] |  |  |
Revenues from sales and services | € 66,920 | € 55,764 | € 72,290
Change in contract work in progress | (1) | (2) | (4)
Net sales from operations | € 66,919 | € 55,762 | € 72,286

X
- Definition It represents the amount of change in contract work in progress. + References No definition available. + Details
Name: | E_ChangeInContractWorkInProgress
Namespace Prefix: | E_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | E_DisclosureOfRevenueExplanatoryAbstract
Namespace Prefix: | E_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition It represents the amount of net sales from operations. + References No definition available. + Details
Name: | E_NetSalesFromOperations
Namespace Prefix: | E_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition It represents the amount of revenues from sales and services gross. + References No definition available. + Details
Name: | E_RevenueFromSalesAndServicesGross
Namespace Prefix: | E_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration