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Provisions for employee benefits (Details Textual) - EUR (€) € in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Statement Line Items [Line Items] |  |
Net defined benefit liability (asset) | € 1,022 | € 868
Estimate of contributions expected to be paid to plan for next annual reporting period | 123 |
Exploration Production Segment [Member] |  |
Statement Line Items [Line Items] |  |
Net defined benefit liability (asset) | 177 | 60
Foreign defined benefit plans [Member] |  |
Statement Line Items [Line Items] |  |
Net defined benefit liability (asset) | 409 | 276
Pension Plans [Member] |  |
Statement Line Items [Line Items] |  |
Net defined benefit liability (asset) | 334 | 184
Other Long Term benefit Plans [Member] |  |
Statement Line Items [Line Items] |  |
Net defined benefit liability (asset) | 207 | 170
Other Long Term benefit Plans [Member] | Gas fund [Member] |  |
Statement Line Items [Line Items] |  |
Net defined benefit liability (asset) | 13 | 12
Long-term benefit plans [Member] |  |
Statement Line Items [Line Items] |  |
Net defined benefit liability (asset) | 194 | 158
Deferred monetary incentive plans [Member] |  |
Statement Line Items [Line Items] |  |
Net defined benefit liability (asset) | 120 | 99
jubilee awards [Member] |  |
Statement Line Items [Line Items] |  |
Net defined benefit liability (asset) | 22 | 28
Long-term incentive plan [Member] |  |
Statement Line Items [Line Items] |  |
Net defined benefit liability (asset) | 13 | 14
Isopensione [Member] |  |
Statement Line Items [Line Items] |  |
Net defined benefit liability (asset) | 28 |
Foreign Long-term incentive plans [Member] |  |
Statement Line Items [Line Items] |  |
Net defined benefit liability (asset) | 11 | 17
Defined Plans [Member] |  |
Statement Line Items [Line Items] |  |
Estimate of contributions expected to be paid to plan for next annual reporting period | 59 |
Other long-term plans [Member] |  |
Statement Line Items [Line Items] |  |
Net defined benefit liability (asset) | € 11 | € 17

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- Definition The estimate of the expected contributions to be made to a defined benefit plan for the next annual reporting period. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 147 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_147_b&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 148 -Subparagraph d -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_148_d_iii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 140 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_140_a&doctype=Standard -URIDate 2017-03-09 + Details
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