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Shareholders' equity (Tables) | 12 Months Ended
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Dec. 31, 2017
Shareholders Equity Tables |
Disclosure Of Non controlling Interests Explanatory [text block] | Non-controlling interest
|  | Net profit |  | Shareholders’ equity
(€ million) |  | 2017 |  | 2016 |  | December 31, 2017 |  | December 31, 2016
EniPower Mantova SpA |  |  | 4 |  |  |  | 5 |  |  |  | 23 |  |  |  | 21 |
Adriaplin Doo |  |  | 2 |  |  |  | 2 |  |  |  | 14 |  |  |  | 13 |
Serfactoring SpA |  |  | (3 | ) |  |  |  |  |  |  | 12 |  |  |  | 15 |
|  |  | 3 |  |  |  | 7 |  |  |  | 49 |  |  |  | 49 |
Disclosure of Eni shareholders' equity [text block] | Eni shareholders’ equity
(€ million) |  | December 31, 2017 |  | December 31, 2016
Share capital |  |  | 4,005 |  |  |  | 4,005 |
Legal reserve |  |  | 959 |  |  |  | 959 |
Reserve for treasury shares |  |  | 581 |  |  |  | 581 |
Reserve related to the fair value of cash flow hedging derivatives net of the tax effect |  |  | 183 |  |  |  | 189 |
Reserve related to the fair value of available-for-sale securities net of the tax effect |  |  |  |  |  |  | 4 |
Reserve related to the defined benefit plans net of tax effect |  |  | (114 | ) |  |  | (112 | )
Other reserves |  |  | 280 |  |  |  | 211 |
Cumulative currency translation differences |  |  | 4,818 |  |  |  | 10,319 |
Treasury shares |  |  | (581 | ) |  |  | (581 | )
Retained earnings |  |  | 35,966 |  |  |  | 40,367 |
Interim dividend |  |  | (1,441 | ) |  |  | (1,441 | )
Net profit (loss) for the year |  |  | 3,374 |  |  |  | (1,464 | )
|  |  | 48,030 |  |  |  | 53,037 |
Disclosure of reserves within equity [text block] | The reserves related to the valuation at fair value of cash flow hedging derivatives, available-for-sale financial instruments and defined benefit plans, net of the related tax effect, consisted of the following:
|  | Cash flow hedge derivatives |  | Available-for-sale financial instruments |  | Defined benefit plans |  | Total
(€ million) |  | Gross reserve |  | Deferred tax liabilities |  | Net reserve |  | Gross reserve |  | Deferred tax liabilities |  | Net reserve |  | Gross reserve |  | Deferred tax liabilities |  | Net reserve |  | Gross reserve |  | Deferred tax liabilities |  | Net reserve
Reserve as of December 31, 2016 |  |  | 246 |  |  |  | (57 | ) |  |  | 189 |  |  |  | 5 |  |  |  | (1 | ) |  |  | 4 |  |  |  | (99 | ) |  |  | (13 | ) |  |  | (112 | ) |  |  | 152 |  |  |  | (71 | ) |  |  | 81 |
Changes of the year 2017 |  |  | (59 | ) |  |  | 14 |  |  |  | (45 | ) |  |  | (5 | ) |  |  | 1 |  |  |  | (4 | ) |  |  | (33 | ) |  |  | 29 |  |  |  | (4 | ) |  |  | (97 | ) |  |  | 44 |  |  |  | (53 | )
Foreign currency translation differences |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1 | ) |  |  | 3 |  |  |  | 2 |  |  |  | (1 | ) |  |  | 3 |  |  |  | 2 |
Reversal of the year 2017 |  |  | 53 |  |  |  | (14 | ) |  |  | 39 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 53 |  |  |  | (14 | ) |  |  | 39 |
Reserve as of December 31, 2017 |  |  | 240 |  |  |  | (57 | ) |  |  | 183 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (133 | ) |  |  | 19 |  |  |  | (114 | ) |  |  | 107 |  |  |  | (38 | ) |  |  | 69 |
Reserve as of December 31, 2015 |  |  | (637 | ) |  |  | 163 |  |  |  | (474 | ) |  |  | 9 |  |  |  | (1 | ) |  |  | 8 |  |  |  | (111 | ) |  |  | 10 |  |  |  | (101 | ) |  |  | (739 | ) |  |  | 172 |  |  |  | (567 | )
Changes of the year 2016 |  |  | 360 |  |  |  | (90 | ) |  |  | 270 |  |  |  | (3 | ) |  |  |  |  |  |  | (3 | ) |  |  | 16 |  |  |  | (35 | ) |  |  | (19 | ) |  |  | 373 |  |  |  | (125 | ) |  |  | 248 |
Foreign currency translation differences |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (4 | ) |  |  | 12 |  |  |  | 8 |  |  |  | (4 | ) |  |  | 12 |  |  |  | 8 |
Reversal of the year 2016 |  |  | 523 |  |  |  | (130 | ) |  |  | 393 |  |  |  | (1 | ) |  |  |  |  |  |  | (1 | ) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 522 |  |  |  | (130 | ) |  |  | 392 |
Reserve as of December 31, 2016 |  |  | 246 |  |  |  | (57 | ) |  |  | 189 |  |  |  | 5 |  |  |  | (1 | ) |  |  | 4 |  |  |  | (99 | ) |  |  | (13 | ) |  |  | (112 | ) |  |  | 152 |  |  |  | (71 | ) |  |  | 81 |
Disclosure of detailed information about reconciliation of net profit and shareholders' equity of parent company to consolidated net profit and shareholders' equity [text Block] | Reconciliation of net profit and shareholders’ equity of the parent company Eni SpA to consolidated net profit and shareholders’ equity
|  | Net profit |  | Shareholders’ equity
(€ million) |  | 2017 |  | 2016 |  | December 31, 2017 |  | December 31, 2016
As recorded in Eni SpA’s Financial Statements |  |  | 3,586 |  |  |  | 4,521 |  |  |  | 42,529 |  |  |  | 41,935 |
Excess of net equity stated in the separate accounts of consolidated subsidiaries over the corresponding carrying amounts of the parent company |  |  | (466 | ) |  |  | (5,480 | ) |  |  | 6,110 |  |  |  | 12,384 |
Consolidation adjustments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
- difference between purchase cost and underlying carrying amounts of net equity |  |  | (1 | ) |  |  | (44 | ) |  |  | 145 |  |  |  | 240 |
- adjustments to comply with Group account policies |  |  | 202 |  |  |  | (188 | ) |  |  | 719 |  |  |  | 461 |
- elimination of unrealized intercompany profits |  |  | (88 | ) |  |  | (56 | ) |  |  | (807 | ) |  |  | (801 | )
- deferred taxation |  |  | 144 |  |  |  | (210 | ) |  |  | (617 | ) |  |  | (1,133 | )
|  |  | 3,377 |  |  |  | (1,457 | ) |  |  | 48,079 |  |  |  | 53,086 |
Non-controlling interest |  |  | (3 | ) |  |  | (7 | ) |  |  | (49 | ) |  |  | (49 | )
As recorded in Consolidated Financial Statements |  |  | 3,374 |  |  |  | (1,464 | ) |  |  | 48,030 |  |  |  | 53,037 |

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