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Guarantees, commitments and risks (Details Textual) € in Millions, $ in Millions | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2017 EUR (€) | May 31, 2016 EUR (€) | Dec. 31, 2017 EUR (€) t | Dec. 31, 2017 USD ($) t | Dec. 31, 2016 EUR (€) | Dec. 31, 2015 EUR (€) | Dec. 31, 2017 USD ($) | Jun. 30, 2016 EUR (€)
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Percentage of Exposure to Guarantees |  |  | 10.00% | 10.00% |  |  |  |
Exposure To Credit Risk On Loan Commitments And Financial Guarantee Contracts |  |  | € 16,174.0 |  | € 14,553.0 |  |  |
Risks |  |  | 691.0 |  | 605.0 |  |  |
Borrowings |  |  | 24,707.0 |  | 27,239.0 |  |  |
Undrawn Borrowing Facilities |  |  | 5,802.0 |  | 6,236.0 |  |  |
Contingent Liability, Litigation Damages Sought, value |  |  | 7.0 |  |  |  |  |
Net Assets Liabilities |  |  | 48,000.0 |  |  |  |  |
Other guarantee |  |  | 16,174.0 |  | 14,553.0 |  |  |
Additions through new issuance, Other guarantee |  |  | 1,621.0 |  |  |  |  |
Maximum amount of debt service undertaking | $ |  |  |  |  |  |  | $ 6,400 |
Quantum of natural gas for which litigation damages sought |  | 650 million cubic meters |  |  |  |  |  |
Contractual volumes of gas amount |  |  | 13,300.0 | $ 16,000 |  |  |  |
Other operating (expense) income |  |  | (32.0) |  | 16.0 | € (485.0) |  |
Interest income on financial assets designated at fair value through profit or loss |  |  | 837.0 |  | (482.0) | € 160.0 |  |
Finance income (expense) recognized in profit and loss account relating to purchase,services and other |  |  | 933.0 |  | 840.0 |  |  |
Finance income (expense) recognized in profit and loss account due to exchange rate differences |  |  | 25.0 |  | 276.0 |  |  |
Finance income (expense) recognized in profit and loss account included in net sales from operations |  |  | 54.0 |  | 523.0 |  |  |
Finance income (expense) recognized in profit and loss account related to time value component |  |  | 12.0 |  | 1.0 |  |  |
Estimated damage value |  |  | € 7.0 |  |  |  |  |
Number of years required to monitor natural recovery |  |  | 20 years | 20 years |  |  |  |
Legal compensation sought value |  |  | € 1,800.0 |  |  |  |  |
Estimated compensatory work |  |  | € 9.5 |  |  |  |  |
Quantity of total emission of carbon dioxide | t |  |  | 19,470,000 | 19,470,000 |  |  |  |
Quantity of free emission allowance of carbon dioxide | t |  |  | 8,530,000 | 8,530,000 |  |  |  |
Deficit quantity of emission allowance of carbon dioxide | t |  |  | 10,940,000 | 10,940,000 |  |  |  |
Mozambique rovuma venture SpA [Member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Proportion of ownership interest in joint operation |  |  | 35.71% | 35.71% |  |  |  |
Percentage of divestment and reimbursement in investments accounted for using equity method |  |  | 35.71% | 35.71% |  |  |  |
Customs Agency [member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Contingent Liability, Litigation Damages Sought, value |  |  |  |  | 78.0 |  |  |
Environmental Damage [member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Contingent Liability, Litigation Damages Sought, value |  |  | € 250.0 |  |  |  |  |
Area 4 in Mozambique [Member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Percentage of interest in project |  |  | 25.00% | 25.00% |  |  |  |
Eni International BV [Member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Net Assets Liabilities |  |  |  |  |  |  |  | € 34,700.0
Syndial SpA [Member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Litigation damages annulled by the court | € 1,800.0 |  |  |  |  |  |  |
Eni SpA [Member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Proportion of ownership interest in joint operation |  |  | 50.00% | 50.00% |  |  |  |
Liquidity risk [member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Risks |  |  | € 235.0 |  | 334.0 |  |  |
Credit risk [member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Risks |  |  | 456.0 |  | 271.0 |  |  |
Coral Project [Member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Unsecured and other guarantees on behalf of joint ventures and associates |  |  | 1,334.0 |  |  |  |  |
Coral Project [Member] | TJS Consortium [Member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Value of contract |  |  | 4,375.0 |  |  |  | 5,248 |
Third parties [Member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Guarantee For Bid Bonds And Performance Bonds |  |  | € 2,122.0 |  | 1,705.0 |  |  |
LNG [Member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Estimated annual production capacity |  |  | 3.37 million tonnes | 3.37 million tonnes |  |  |  |
Product sale and purchase agreement duration |  |  | twenty-year term | twenty-year term |  |  |  |
Coral FLNG SA [Member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Proportion of ownership interest in joint operation |  |  | 25.00% | 25.00% |  |  |  |
Customs Agency [member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Contingent Liability, Litigation Damages Sought, value |  |  | € 78.0 |  | 168.0 |  |  |
Decrease in value of litigation damages |  |  | 90.0 |  |  |  |  |
Interests on Excise taxes [Member] | Customs Agency [member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Contingent Liability, Litigation Damages Sought, value |  | € 20.0 |  |  |  |  |  |
Rete Ferroviaria Italiana SpA [Member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Unsecured and other guarantees on behalf of joint ventures and associates |  |  | 6,122.0 |  | 6,122.0 |  |  |
FLNG [Member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Guarantee For Bid Bonds And Performance Bonds |  |  | 1,094.0 |  |  |  |  |
Saipem [Member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Guarantee For Bid Bonds And Performance Bonds |  |  | 1,008.0 |  | 1,705.0 |  |  |
Entity's total for joint ventures [member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Underlying commitment |  |  | 2,594.0 |  | 2,109.0 |  |  |
Other Guarantees [Member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Exposure To Credit Risk On Loan Commitments And Financial Guarantee Contracts |  |  | 10,050.0 |  | 8,429.0 |  |  |
Financial guarantee contracts [member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Bank Guarantee |  |  | 1,623.0 |  | 82.0 |  |  |
Unsecured and other guarantees [Member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Underlying commitment |  |  | 224.0 |  | 202.0 |  |  |
Unsecured and other guarantees on behalf of joint ventures and associates |  |  | 352.0 |  | 202.0 |  |  |
Unsecured and other guarantees [Member] | Angola LNG Supply Service Llc [Member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Unsecured and other guarantees on behalf of joint ventures and associates |  |  | € 169.0 |  | 193.0 |  |  |
Percentage of Exposure to Guarantees |  |  | 13.60% | 13.60% |  |  |  |
Unsecured and other guarantees [Member] | Coral Off Shore Project [Member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Unsecured and other guarantees on behalf of joint ventures and associates |  |  | € 148.0 |  | 178.0 |  |  |
Percentage of Exposure to Guarantees |  |  | 25.00% | 25.00% |  |  |  |
Other Commitments [Member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Exposure To Credit Risk On Loan Commitments And Financial Guarantee Contracts |  |  | € 14,498.0 |  | 20,682.0 |  |  |
Capital Commitments |  |  | 11,289.0 |  | 12,415.0 |  |  |
Investments In Joint Ventures |  |  | 128.0 |  | 129.0 |  |  |
Lease Liabilities |  |  |  |  | 4,344.0 |  |  |
Capital commitments |  |  | 11,289.0 |  | 12,415.0 |  |  |
Other Commitments [Member] | Regasified gas at the Pascagoula plant [Member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Capital Commitments |  |  | 2,113.0 |  | 2,541.0 |  |  |
Capital commitments |  |  | 2,113.0 |  | 2,541.0 |  |  |
Other Commitments [Member] | Regasification capacity at the Pascagoula terminal [Member] [Member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Capital Commitments |  |  | 948.0 |  | 1,156.0 |  |  |
Capital commitments |  |  | 948.0 |  | 1,156.0 |  |  |
Project financing agreement [Member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Bank Acceptance Liabilities |  |  | 3,898.0 |  |  |  | 4,676 |
Equivalent value of company share in debt service undertaking |  |  | 1,334.0 |  |  |  | 1,600 |
Project financing agreement [Member] | Mozambique State-owned company ENH [Member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Credit facility subscribed by the sponsors |  |  | 417.0 |  |  |  | 500 |
Equivalent value of company share in credit facility |  |  | 116.0 |  |  |  | 139 |
Derivatives [Member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Other operating (expense) income |  |  | 44.0 |  | 17.0 |  |  |
Consolidated Subsidiaries [Member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Exposure To Credit Risk On Loan Commitments And Financial Guarantee Contracts |  |  | 5,594.0 |  | 5,868.0 |  |  |
Consolidated Subsidiaries [Member] | Other Guarantees [Member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Other guarantees on behalf of consolidated subsidiaries |  |  | 5,594.0 |  | 5,868.0 |  |  |
Guarantee For Bid Bonds And Performance Bonds |  |  | 2,312.0 |  | 1,965.0 |  |  |
Value Added Tax Receivables |  |  | 1,201.0 |  | 1,380.0 |  |  |
Bank Guarantee |  |  | 1,010.0 |  | 1,010.0 |  |  |
Liabilities Arising From Insurance Contracts |  |  | 137.0 |  | 141.0 |  |  |
Underlying commitment |  |  | 5,563.0 |  | 5,784.0 |  |  |
Exposure To Credit Risk On Loan Commitments And Financial Guarantee Contracts |  |  | 5,594.0 |  | 5,868.0 |  |  |
Other guarantee |  |  | 5,594.0 |  | 5,868.0 |  |  |
Unconsolidated Subsidiaries [Member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Exposure To Credit Risk On Loan Commitments And Financial Guarantee Contracts |  |  | 181.0 |  | 246.0 |  |  |
Unconsolidated Subsidiaries [Member] | Other Guarantees [Member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Other guarantees on behalf of consolidated subsidiaries |  |  | 181.0 |  | 246.0 |  |  |
Guarantee For Bid Bonds And Performance Bonds |  |  | 176.0 |  | 240.0 |  |  |
Underlying commitment |  |  | 12.0 |  | 53.0 |  |  |
Exposure To Credit Risk On Loan Commitments And Financial Guarantee Contracts |  |  | 181.0 |  | 246.0 |  |  |
Other guarantee |  |  | 181.0 |  | 246.0 |  |  |
Joint ventures and associates [Member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Unsecured and other guarantees on behalf of joint ventures and associates |  |  | 10,046.0 |  | 8,236.0 |  |  |
Exposure To Credit Risk On Loan Commitments And Financial Guarantee Contracts |  |  | 10,046.0 |  | 8,236.0 |  |  |
Other guarantee |  |  | 10,046.0 |  | 8,236.0 |  |  |
Joint ventures and associates [Member] | Other Guarantees [Member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Exposure To Credit Risk On Loan Commitments And Financial Guarantee Contracts |  |  | 3,922.0 |  | € 2,112.0 |  |  |
TJS Consortium [Member] | Coral FLNG SA [Member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Maximum financial guarantee given by the company |  |  | 1,094.0 |  |  |  | 1,312 |
Debt service undertaking [Member] | Mozambique State-owned company ENH [Member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Credit facility subscribed by the sponsors |  |  | 533.0 |  |  |  | 640 |
Equivalent value of company share in credit facility |  |  | 148.0 |  |  |  | 178 |
Petroleum activities [Member] | Parent company guarantee [Member] | Third parties [Member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Maximum financial guarantee given by the company |  |  | € 1,250.0 |  |  |  | $ 1,500 |
ExxonMobil [Member] | Engineering Procurement Construction Installation and Commissioning [Member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Percentage of interest held by other entities in contract |  |  | 25.00% |  |  |  | 25.00% |
CNPC [Member] | Engineering Procurement Construction Installation and Commissioning [Member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Percentage of interest held by other entities in contract |  |  | 20.00% |  |  |  | 20.00% |
Parent company guarantee [Member] | Petroleum activities [Member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Explanation of information about percentage of obligation issued by the company and its take over by other concessionaires |  |  | This parent company guarantee issued by Eni covering 100% of the aforementioned obligations has been taken over by the other concessionaires (Kogas, Galp and ENH) and by ExxonMobil and CNPC shareholders of the joint operation Mozambico Rovuma Venture SpA, in proportion to their respective direct or indirect participating interest in the EPCC of Area 4. | This parent company guarantee issued by Eni covering 100% of the aforementioned obligations has been taken over by the other concessionaires (Kogas, Galp and ENH) and by ExxonMobil and CNPC shareholders of the joint operation Mozambico Rovuma Venture SpA, in proportion to their respective direct or indirect participating interest in the EPCC of Area 4. |  |  |  |
Excise taxes [Member] | Customs Agency [member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Contingent Liability, Litigation Damages Sought, value |  | 114.0 |  |  |  |  |  |
Customs Agency [member] | Fines [Member] [Member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Contingent Liability, Litigation Damages Sought, value |  | € 34.0 |  |  |  |  |  |
Euro Medium Term Notes [Member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Bonds Issued |  |  | € 1,800.0 |  |  |  |  |
Notional amount |  |  | 20,000.0 |  |  |  |  |
Issuance of debt notes drawn |  |  | 16,800.0 |  |  |  |  |
Short-termBorrowings [Member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Undrawn Borrowing Facilities |  |  | 11,625.0 |  |  |  |  |
Short-termBorrowings [Member] | Committed Amount [Member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Undrawn Borrowing Facilities |  |  | 41.0 |  |  |  |  |
Long-termBorrowings [Member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Undrawn Borrowing Facilities |  |  | 5,802.0 |  |  |  |  |
Long-termBorrowings [Member] | Due within 12 months [Member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Undrawn Borrowing Facilities |  |  | 750.0 |  |  |  |  |
Next four years [Member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Capital Commitments |  |  | 31,600.0 |  |  |  |  |
Capital commitments |  |  | € 31,600.0 |  |  |  |  |

X
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