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Short-term debt (Details Textual) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
DisclosureOfShorttermDebtLineItems [Line Items] |  |  |
Decrease In Current Borrowings | € 1,154 |  |
Cash flows from (used in) increase (decrease) in current borrowings | (581) | € (2,645) | € 3,216
Foreign exchange gain (loss) | (905) | 676 | € (354)
Current commercial papers issued and current portion of non-current commercial papers issued | 1,664 | 2,738 |
Undrawn borrowing facilities | 5,802 | 6,236 |
Eni Finance USA Inc [Member] |  |  |
DisclosureOfShorttermDebtLineItems [Line Items] |  |  |
Current commercial papers issued and current portion of non-current commercial papers issued | 1,070 | 1,750 |
Eni Finance International SA [Member] |  |  |
DisclosureOfShorttermDebtLineItems [Line Items] |  |  |
Current commercial papers issued and current portion of non-current commercial papers issued | 594 | € 988 |
Euro Reporting Subsidiaries [Member] |  |  |
DisclosureOfShorttermDebtLineItems [Line Items] |  |  |
Foreign exchange gain (loss) | € 574 |  |
Short-Term Debt [Member] |  |  |
DisclosureOfShorttermDebtLineItems [Line Items] |  |  |
Borrowings, interest rate | 1.30% | 0.90% |
Credit Facility One [Member] |  |  |
DisclosureOfShorttermDebtLineItems [Line Items] |  |  |
Undrawn borrowing facilities | € 11,584 | € 12,267 |

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- Definition The interest rate on borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_7&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The cash inflow (outflow) due to a decrease (increase) in current borrowings. [Refer: Current borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2017-01-01 -Paragraph 17 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_17&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of current commercial paper issued and the current portion of non-current commercial paper issued. [Refer: Commercial papers issued] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of exchange differences recognised in profit or loss that arise from foreign currency transactions, excluding those arising on financial instruments measured at fair value through profit or loss in accordance with IFRS 9. [Refer: At fair value [member]; Financial instruments, class [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2017-01-01 -Section A Statement of cash flows for an entity other than a financial institution -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=sect_AStatementofcashflowsforanentityotherthanafinancialinstitution&doctype=Illustrative%20Examples -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 21 -IssueDate 2017-01-01 -Paragraph 52 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=21&date=2017-03-01&anchor=para_52_a&doctype=Standard -URIDate 2017-03-09 + Details
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