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Provisions for employee benefits (Details Textual) - EUR (€) € in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement [Line Items]
Net defined benefit liability (asset)	€ 136	€ 31	€ 3
Estimate of contributions expected to be paid to plan for next annual reporting period	129
Exploration And Production Segment Total [Member]
Statement [Line Items]
Net defined benefit liability (asset)	181	€ 177
Jubilee Awards [Member]
Statement [Line Items]
Net defined benefit liability (asset)	22
Long Term Incentive Plan [Member]
Statement [Line Items]
Net defined benefit liability (asset)	8
Isopensione [Member]
Statement [Line Items]
Net defined benefit liability (asset)	132
Defined Plans [Member]
Statement [Line Items]
Estimate of contributions expected to be paid to plan for next annual reporting period	48
Other Long term Plans [Member]
Statement [Line Items]
Net defined benefit liability (asset)	€ 11

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- Definition

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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 2018-01-01
-Paragraph 147
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_147_b&doctype=Standard
-URIDate 2018-03-16

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2018-01-01
-Paragraph 148
-Subparagraph d
-Clause iii
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_148_d_iii&doctype=Standard
-URIDate 2018-03-16

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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
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-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_140_a&doctype=Standard
-URIDate 2018-03-16

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