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Investments (Details Textual) € in Millions	12 Months Ended
	Dec. 31, 2017 EUR (€) MMBoe	Dec. 31, 2016 EUR (€)	Dec. 31, 2015 EUR (€)
DisclosureOfInvestmentsLineItems [Line Items]
Additions and subscriptions in investments accounted for using equity method	€ 507	€ 1,156
Divestments and reimbursement in investments accounted for using equity method	(462)	(138)
Increase (decrease) in investments using equity method resulting from other changes	7	(53)
Difference amount between purchase price of interest acquired and book value of corresponding fraction of net equity	70
Investments other than investments accounted for using equity method	219	276	€ 660
Capital reimbursement in investments accounted for using equity method	165
Investments accounted for using equity method	3,511	4,040	2,853
Share Of Loss Of Equity Accounted Investments	(353)	(370)
Currency Translation Differences	268
Other long-term provisions	13,447	13,896
Carrying amounts before valuation allowance	2,000
Equity-accounted investments [Member]
DisclosureOfInvestmentsLineItems [Line Items]
Other long-term provisions	182	151
US Dollars denominated [Member]
DisclosureOfInvestmentsLineItems [Line Items]
Currency Translation Differences	189
Investments accounted for using equity method [member]
DisclosureOfInvestmentsLineItems [Line Items]
Impairment Loss	€ 758
Area 4 in Mozambique [Member]
DisclosureOfInvestmentsLineItems [Line Items]
Percentage of divestment and reimbursement in investments accounted for using equity method	50.00%
Associates [Member]
DisclosureOfInvestmentsLineItems [Line Items]
Investments other than investments accounted for using equity method	€ 5	10	€ 10
Investments accounted for using equity method	1,063	1,197
Joint Ventures [Member]
DisclosureOfInvestmentsLineItems [Line Items]
Investments accounted for using equity method	2,332	2,675
Saipem SpA [Member]
DisclosureOfInvestmentsLineItems [Line Items]
Investments accounted for using equity method	1,413
Share Of Loss Of Equity Accounted Investments	€ 101	144
Excess of market capitalization rate	20.00%
Saipem SpA [Member] | Joint Ventures [Member]
DisclosureOfInvestmentsLineItems [Line Items]
Investments accounted for using equity method	€ 1,413	1,497
Angola LNG Ltd [Member]
DisclosureOfInvestmentsLineItems [Line Items]
Capital reimbursement in investments accounted for using equity method	48
Share Of Loss Of Equity Accounted Investments		62
Angola LNG Ltd [Member] | Associates [Member]
DisclosureOfInvestmentsLineItems [Line Items]
Investments accounted for using equity method	802	916
Union Fenosa Gas SA [Member]
DisclosureOfInvestmentsLineItems [Line Items]
Increase (decrease) in investments using equity method resulting from other changes	35	84
Share Of Loss Of Equity Accounted Investments	28
Union Fenosa Gas SA [Member] | Joint Ventures [Member]
DisclosureOfInvestmentsLineItems [Line Items]
Difference amount between purchase price of interest acquired and book value of corresponding fraction of net equity	27
Investments accounted for using equity method	350	434
Novamont SpA [Member] | Associates [Member]
DisclosureOfInvestmentsLineItems [Line Items]
Difference amount between purchase price of interest acquired and book value of corresponding fraction of net equity	43
Investments accounted for using equity method	71	77
Coral FLNG SA [Member]
DisclosureOfInvestmentsLineItems [Line Items]
Additions and subscriptions in investments accounted for using equity method	€ 443
Percentage of divestment and reimbursement in investments accounted for using equity method	25.00%
Disposals of investments accounted for using equity method	€ 222
Coral FLNG SA [Member] | Associates [Member]
DisclosureOfInvestmentsLineItems [Line Items]
Investments accounted for using equity method	54
Lotte Versalis Elastomers Co Ltd [Member]
DisclosureOfInvestmentsLineItems [Line Items]
Additions and subscriptions in investments accounted for using equity method	45
Lotte Versalis Elastomers Co Ltd [Member] | Joint Ventures [Member]
DisclosureOfInvestmentsLineItems [Line Items]
Investments accounted for using equity method	114	74
United Gas Derivatives Co [Member]
DisclosureOfInvestmentsLineItems [Line Items]
Capital reimbursement in investments accounted for using equity method	27
United Gas Derivatives Co [Member] | Associates [Member]
DisclosureOfInvestmentsLineItems [Line Items]
Investments accounted for using equity method	€ 82	€ 117
Perla offshore gas field [Member]
DisclosureOfInvestmentsLineItems [Line Items]
Barrels of oil equivalent undeveloped reserves reclassified from proved to unproved | MMBoe	315

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