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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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