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Investments (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure Of Investments [Abstract] |
Disclosure of investments accounted for using equity method [text block] | Equity-accounted investments
|  | 2018 |  | 2017
(€ million) |  | Investments in unconsolidated entities controlled by Eni |  | Joint ventures |  | Associates |  | Total |  | Investments in unconsolidated entities controlled by Eni |  | Joint ventures |  | Associates |  | Total
Carrying amount – beginning of the year |  |  | 116 |  |  |  | 2,332 |  |  |  | 1,063 |  |  |  | 3,511 |  |  |  | 168 |  |  |  | 2,675 |  |  |  | 1,197 |  |  |  | 4,040 |
Changes in accounting policies (IFRS 9 and 15) |  |  |  |  |  |  | (34 | ) |  |  | (3 | ) |  |  | (37 | ) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying amount restated – beginning of the year |  |  | 116 |  |  |  | 2,298 |  |  |  | 1,060 |  |  |  | 3,474 |  |  |  | 168 |  |  |  | 2,675 |  |  |  | 1,197 |  |  |  | 4,040 |
Additions and subscriptions |  |  |  |  |  |  | 28 |  |  |  | 92 |  |  |  | 120 |  |  |  |  |  |  |  | 63 |  |  |  | 444 |  |  |  | 507 |
Divestments and reimbursements |  |  | (33 | ) |  |  | (3 | ) |  |  | (115 | ) |  |  | (151 | ) |  |  |  |  |  |  |  |  |  |  | (462 | ) |  |  | (462 | )
Share of profit of equity-accounted investments |  |  | 8 |  |  |  | 16 |  |  |  | 385 |  |  |  | 409 |  |  |  | 9 |  |  |  | 49 |  |  |  | 66 |  |  |  | 124 |
Share of loss of equity-accounted investments |  |  | (5 | ) |  |  | (415 | ) |  |  | (10 | ) |  |  | (430 | ) |  |  | (7 | ) |  |  | (340 | ) |  |  | (6 | ) |  |  | (353 | )
Deduction for dividends |  |  | (6 | ) |  |  | (19 | ) |  |  | (25 | ) |  |  | (50 | ) |  |  | (32 | ) |  |  | (41 | ) |  |  | (13 | ) |  |  | (86 | )
Changes in the scope of consolidation |  |  |  |  |  |  | 3,448 |  |  |  |  |  |  |  | 3,448 |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  | 2 |
Currency translation differences |  |  | 2 |  |  |  | 25 |  |  |  | 54 |  |  |  | 81 |  |  |  | (13 | ) |  |  | (127 | ) |  |  | (128 | ) |  |  | (268 | )
Other changes |  |  | 13 |  |  |  | 119 |  |  |  | 11 |  |  |  | 143 |  |  |  | (11 | ) |  |  | 53 |  |  |  | (35 | ) |  |  | 7 |
Carrying amount – end of the year |  |  | 95 |  |  |  | 5,497 |  |  |  | 1,452 |  |  |  | 7,044 |  |  |  | 116 |  |  |  | 2,332 |  |  |  | 1,063 |  |  |  | 3,511 |
Disclosure of detailed information about entity wise equity-accounted investments [text block] | Net carrying amount of equity-accounted investments in related to the following:
|  | December 31, 2018 |  |  | December 31, 2017 |
(€ million) |  | Net carrying amount |  |  | % of the investment |  |  | Net carrying amount |  |  | % of the investment |
Investments in unconsolidated entities controlled by Eni |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Eni BTC Ltd |  |  | 31 |  |  |  | 100.00 |  |  |  | 63 |  |  |  | 100.00 |
Other investments (*) |  |  | 64 |  |  |  |  |  |  |  | 53 |  |  |  |  |
|  |  | 95 |  |  |  |  |  |  |  | 116 |  |  |  |  |
Joint ventures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vår Energi AS |  |  | 3,498 |  |  |  | 69.60 |  |  |  |  |  |  |  |  |
Saipem SpA |  |  | 1,228 |  |  |  | 30.99 |  |  |  | 1,413 |  |  |  | 31.00 |
Unión Fenosa Gas SA |  |  | 335 |  |  |  | 50.00 |  |  |  | 350 |  |  |  | 50.00 |
Gas Distribution Company of Thessaloniki – Thessaly SA |  |  | 137 |  |  |  | 49.00 |  |  |  | 137 |  |  |  | 49.00 |
Cardón IV SA |  |  | 98 |  |  |  | 50.00 |  |  |  |  |  |  |  |  |
Lotte Versalis Elastomers Co Ltd |  |  | 75 |  |  |  | 50.00 |  |  |  | 114 |  |  |  | 50.00 |
PetroJunín SA |  |  | 47 |  |  |  | 40.00 |  |  |  | 210 |  |  |  | 40.00 |
AET – Raffineriebeteiligungsgesellschaft mbH |  |  | 32 |  |  |  | 33.33 |  |  |  | 32 |  |  |  | 33.33 |
Other investments (*) |  |  | 47 |  |  |  |  |  |  |  | 76 |  |  |  |  |
|  |  | 5,497 |  |  |  |  |  |  |  | 2,332 |  |  |  |  |
Associates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Angola LNG Ltd |  |  | 1,106 |  |  |  | 13.60 |  |  |  | 802 |  |  |  | 13.60 |
Coral FLNG SA |  |  | 102 |  |  |  | 25.00 |  |  |  | 54 |  |  |  | 25.00 |
Novamont SpA |  |  | 67 |  |  |  | 25.00 |  |  |  | 71 |  |  |  | 25.00 |
United Gas Derivatives Co |  |  | 62 |  |  |  | 33.33 |  |  |  | 82 |  |  |  | 33.33 |
Commonwealth Fusion Systems Llc |  |  | 42 |  |  |  | 33.72 |  |  |  |  |  |  |  |  |
Other investments (*) |  |  | 73 |  |  |  |  |  |  |  | 54 |  |  |  |  |
|  |  | 1,452 |  |  |  |  |  |  |  | 1,063 |  |  |  |  |
|  |  | 7,044 |  |  |  |  |  |  |  | 3,511 |  |  |  |  |
Disclosure of detailed information about the market value of the investments listed in stock markets [text block] | As of December 31, 2018 , the market value of the investments listed in regulated stock markets was as follows:
|  |  |  | Saipem SpA
Number of shares held |  |  |  |  |  |  | 308,767,968 |
% of the investment |  |  |  |  |  |  | 30.99 |
Share price (€) |  |  |  |  |  |  | 3.265 |
Market value (€ million) |  |  |  |  |  |  | 1,008 |
Book value (€ million) |  |  |  |  |  |  | 1,228 |
Disclosure of investments other than investments accounted for using equity method [text block] | Other investments
(€ million) |  | 2018 |  | 2017
Carrying amount – beginning of the year |  |  | 219 |  |  |  | 276 |
Changes in accounting policies (IFRS 9) |  |  | 681 |  |  |  |  |
Carrying amount restated – beginning of the year |  |  | 900 |  |  |  | 276 |
Additions and subscriptions |  |  | 5 |  |  |  | 3 |
Change in the fair value |  |  | 15 |  |  |  |  |
Divestments and reimbursements |  |  | (22 | ) |  |  | (19 | )
Currency translation differences |  |  | 31 |  |  |  | (23 | )
Other changes |  |  | (10 | ) |  |  | (18 | )
Carrying amount – end of the year |  |  | 919 |  |  |  | 219 |

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