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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