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Shareholders' equity (Tables) | 12 Months Ended
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Dec. 31, 2018
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) |  |  | 2018 |  |  | 2017 |  |  | December 31, 2018 |  |  | December 31, 2017 |
As recorded in Eni SpA’s Financial Statements |  |  |  |  | 3,173 |  |  |  |  |  | 3,586 |  |  |  |  |  | 42,615 |  |  |  |  |  | 42,529 |  |
Excess of net equity stated in the separate accounts of consolidated subsidiaries over the corresponding carrying amounts of the parent company |  |  |  |  | (134) |  |  |  |  |  | (466) |  |  |  |  |  | 7,183 |  |  |  |  |  | 6,110 |  |
Consolidation adjustments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
- difference between purchase cost and underlying carrying amounts of net equity |  |  |  |  |  |  |  |  |  |  | (1) |  |  |  |  |  | 153 |  |  |  |  |  | 145 |  |
- adjustments to comply with Group account policies |  |  |  |  | 862 |  |  |  |  |  | 202 |  |  |  |  |  | 2,000 |  |  |  |  |  | 719 |  |
- elimination of unrealized intercompany profits |  |  |  |  | 177 |  |  |  |  |  | (88) |  |  |  |  |  | (519) |  |  |  |  |  | (807) |  |
- deferred taxation |  |  |  |  | 59 |  |  |  |  |  | 144 |  |  |  |  |  | (359) |  |  |  |  |  | (617) |  |
|  |  |  |  | 4,137 |  |  |  |  |  | 3,377 |  |  |  |  |  | 51,073 |  |  |  |  |  | 48,079 |  |
Non-controlling interest |  |  |  |  | (11) |  |  |  |  |  | (3) |  |  |  |  |  | (57) |  |  |  |  |  | (49) |  |
As recorded in Consolidated Financial Statements |  |  |  |  | 4,126 |  |  |  |  |  | 3,374 |  |  |  |  |  | 51,016 |  |  |  |  |  | 48,030
Disclosure of detailed information about Share capital Reserves and Equity interest [Text block] | As of January 1, 2018 , the effects of the application of IFRS 9 and IFRS 15 are the following:
(€ million) |  | Share capital |  |  | Retained Earnings |  |  | Other reserves |  |  | Net profit (loss) |  |  | Total |
Carrying amount at December 31, 2017 |  |  | 4,005 |  |  |  | 35,966 |  |  |  | 4,685 |  |  |  | 3,374 |  |  |  | 48,030 |
Changes in accounting principles (IFRS 9) |  |  |  |  |  |  | 294 |  |  |  |  |  |  |  |  |  |  |  | 294 |
Changes in accounting principles (IFRS 15) |  |  |  |  |  |  | (49 | ) |  |  |  |  |  |  |  |  |  |  | (49 | )
Carrying amount at January 1, 2018 |  |  | 4,005 |  |  |  | 36,211 |  |  |  | 4,685 |  |  |  | 3,374 |  |  |  | 48,275 |
Equity attributable to owners of parent [member] |
Disclosure of share capital, reserves and other equity interest [text block] |
(€ million) |  |  | December 31, 2018 |  |  | December 31, 2017 |
Share capital |  |  |  |  | 4,005 |  |  |  |  |  | 4,005 |  |
Retained earnings |  |  |  |  | 36,702 |  |  |  |  |  | 35,966 |  |
Cumulative currency translation differences |  |  |  |  | 6,605 |  |  |  |  |  | 4,818 |  |
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 |  |  |  |  | (9) |  |  |  |  |  | 183 |  |
Reserve related to the defined benefit plans net of tax effect |  |  |  |  | (130) |  |  |  |  |  | (114) |  |
Other comprehensive income on equity-accounted investments |  |  |  |  | 66 |  |  |  |  |  | 90 |  |
Other comprehensive income on other investments |  |  |  |  | 15 |  |  |  |  |  |  |  |
Other reserves |  |  |  |  | 190 |  |  |  |  |  | 190 |  |
Treasury shares |  |  |  |  | (581) |  |  |  |  |  | (581) |  |
Interim dividend |  |  |  |  | (1,513) |  |  |  |  |  | (1,441) |  |
Net profit (loss) for the year |  |  |  |  | 4,126 |  |  |  |  |  | 3,374 |  |
|  |  |  |  | 51,016 |  |  |  |  |  | 48,030 |  |
Reserve of cash flow hedges [member] | Reserve of remeasurements of defined benefit plans [member] | Reserve of gains and losses on remeasuring available-for-sale financial assets [member] |
Disclosure of reserves within equity [text block] | Other Comprehensive Income reserves
|  | Cash flow hedge derivatives |  | Defined benefit plans |  |  |  |
(€ million) |  | Gross reserve |  | Deferred tax liabilities |  | Net reserve |  | Gross reserve |  | Deferred tax liabilities |  | Net reserve |  | Other comprehensive income on equity- accounted investments |  | Investments valued at fair value
Reserve as of December 31, 2017 |  |  | 240 |  |  |  | (57 | ) |  |  | 183 |  |  |  | (133 | ) |  |  | 19 |  |  |  | (114 | ) |  |  | 90 |  |  |  |  |
Changes of the year |  |  | 399 |  |  |  | (116 | ) |  |  | 283 |  |  |  | (15 | ) |  |  | (2 | ) |  |  | (17 | ) |  |  | (24 | ) |  |  | 15 |
Foreign currency translation differences |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  | (1 | ) |  |  |  |  |  |  |  |  |  |  |  |
Change in scope of consolidation |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  | (3 | ) |  |  | 1 |  |  |  |  |  |  |  |  |
Reversal to inventories adjustments |  |  | (10 | ) |  |  | 3 |  |  |  | (7 | ) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification adjustments |  |  | (642 | ) |  |  | 174 |  |  |  | (468 | ) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reserve as of December 31, 2018 |  |  | (13 | ) |  |  | 4 |  |  |  | (9 | ) |  |  | (143 | ) |  |  | 13 |  |  |  | ( 130 | ) |  |  | 66 |  |  |  | 15 |
Reserve as of December 31, 2016 |  |  | 246 |  |  |  | (57 | ) |  |  | 189 |  |  |  | (99 | ) |  |  | (13 | ) |  |  | (112 | ) |  |  | 21 |  |  |  |  |
Changes of the year |  |  | (59 | ) |  |  | 14 |  |  |  | (45 | ) |  |  | (33 | ) |  |  | 29 |  |  |  | (4 | ) |  |  | 69 |  |  |  |  |
Foreign currency translation differences |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1 | ) |  |  | 3 |  |  |  | 2 |  |  |  |  |  |  |  |  |
Reclassification adjustments |  |  | 53 |  |  |  | (14 | ) |  |  | 39 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reserve as of December 31, 2017 |  |  | 240 |  |  |  | (57 | ) |  |  | 183 |  |  |  | (133 | ) |  |  | 19 |  |  |  | ( 114 | ) |  |  | 90 |  |  |  |  |

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