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Other information (Details Textual) - EUR (€) € in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure Of Notes And Other Explanatory Information Explanatory [Line Items] |  |  |  |  |  |  |
Percentage of voting equity interests acquired | 69.60% |  |  |  |  |  |
Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities | € 119 |  |  |  |  |  |
Net Assets Excluded from Consolidation of Entities | 2,486 |  |  |  |  |  |
Cash and cash equivalents | 10,836 | [1] | € 7,363 | [1] | € 5,674 | [1] | € 5,209
Value of Investments Recognized | 3,498 |  |  |  |  |  |
Cumulative gain (loss) on disposal of investments in equity instruments designated at fair value through other comprehensive income | 889 |  |  |  |  |  |
Exchange Rate Differences Net | € 123 |  |  |  |  |  |
Percentage of Stake held by Subsidiary | 26.25% |  |  |  |  |  |
Proceeds from issue of ordinary shares | € 145 |  |  |  |  |  |
Cash Divested Net | € 13 |  |  |  |  |  |
Tigz Zrt [Member] |  |  |  |  |  |  |
Disclosure Of Notes And Other Explanatory Information Explanatory [Line Items] |  |  |  |  |  |  |
Percentage of Stake held by Subsidiary | 98.99% |  |  |  |  |  |
Tigz Dso [Member] |  |  |  |  |  |  |
Disclosure Of Notes And Other Explanatory Information Explanatory [Line Items] |  |  |  |  |  |  |
Percentage of Stake held by Subsidiary | 100.00% |  |  |  |  |  |
Lasmo sanga sanga [Member] |  |  |  |  |  |  |
Disclosure Of Notes And Other Explanatory Information Explanatory [Line Items] |  |  |  |  |  |  |
Proceeds from issue of ordinary shares | € 33 |  |  |  |  |  |
Eni Croatia BV [Member] |  |  |  |  |  |  |
Disclosure Of Notes And Other Explanatory Information Explanatory [Line Items] |  |  |  |  |  |  |
Percentage of Stake held by Subsidiary | 100.00% |  |  |  |  |  |
Proceeds from issue of ordinary shares | € 20 |  |  |  |  |  |
Cash Divested Net | € 15 |  |  |  |  |  |
Eni Trinidad and Tobago Ltd [Member] |  |  |  |  |  |  |
Disclosure Of Notes And Other Explanatory Information Explanatory [Line Items] |  |  |  |  |  |  |
Percentage of Stake held by Subsidiary | 100.00% |  |  |  |  |  |
Proceeds from issue of ordinary shares | € 10 |  |  |  |  |  |
Mossi Ghisolfi Group [Member] |  |  |  |  |  |  |
Disclosure Of Notes And Other Explanatory Information Explanatory [Line Items] |  |  |  |  |  |  |
Consideration transferred, acquisition-date fair value | € 75 |  |  |  |  |  |
Gas Supply Company [Member] |  |  |  |  |  |  |
Disclosure Of Notes And Other Explanatory Information Explanatory [Line Items] |  |  |  |  |  |  |
Percentage of voting equity interests acquired | 51.00% |  |  |  |  |  |
Thessalia SA [Member] |  |  |  |  |  |  |
Disclosure Of Notes And Other Explanatory Information Explanatory [Line Items] |  |  |  |  |  |  |
Consideration transferred, acquisition-date fair value | € 24 |  |  |  |  |  |
Mestni Plinovodi distribucija plina doo [Member] |  |  |  |  |  |  |
Disclosure Of Notes And Other Explanatory Information Explanatory [Line Items] |  |  |  |  |  |  |
Consideration transferred, acquisition-date fair value | 15 |  |  |  |  |  |
Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities | € 1 |  |  |  |  |  |
[1] | Cash and cash equivalents as of December 31, 2018, include €19 million of cash and cash equivalents of consolidated subsidiaries held for sale that were reported in the item Assets held for sale in the balance sheet

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