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Shareholders' equity (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of detailed information about reconciliation of net profit and shareholders' equity of parent company to consolidated net profit and shareholders' equity [text Block]
Reconciliation of net profit and shareholders’ equity of the parent company Eni SpA to consolidated net profit and shareholders’ equity
 
   
Net profit
  
Shareholders’ equity
 
(€ million)
  
2018
  
2017
  
December 31, 
2018
  
December 31, 
2017
 
As recorded in Eni SpA’s Financial Statements
    3,173     3,586     42,615     42,529  
Excess of net equity stated in the separate accounts of 
consolidated subsidiaries over the corresponding 
carrying amounts of the parent company		    (134)     (466)     7,183     6,110  
Consolidation adjustments:                         
- difference between purchase cost and underlying carrying amounts of net equity          (1)     153     145  
- adjustments to comply with Group account policies
    862     202     2,000     719  
- elimination of unrealized intercompany profits
    177     (88)     (519)     (807)  
- deferred taxation
    59     144     (359)     (617)  
     4,137     3,377     51,073     48,079  
Non-controlling interest
    (11)     (3)     (57)     (49)  
As recorded in Consolidated Financial Statements
    4,126     3,374     51,016     48,030
Disclosure of detailed information about Share capital Reserves and Equity interest [Text block]
As of
January 1, 2018
, the effects of the application of IFRS
9
and IFRS
15
are the following:
(€ million)
 
 
Share
capital
 
 
Retained
Earnings
 
 
Other
reserves
 
 
Net profit
(loss)
 
 
Total
 
Carrying amount at December 31, 2017
 
 
4,005
 
 
 
35,966
 
 
 
4,685
 
 
 
3,374
 
 
 
48,030
 
Changes in accounting principles (IFRS 9)
 
 
 
 
 
 
294
 
 
 
 
 
 
 
 
 
 
 
294
 
Changes in accounting principles (IFRS 15)
 
 
 
 
 
 
(49)
 
 
 
 
 
 
 
 
 
 
(49
)
Carrying amount at January 1, 2018
 
 
4,005
 
 
 
36,211
 
 
 
4,685
 
 
 
3,374
 
 
 
48,275
 
Equity attributable to owners of parent [member]  
Disclosure of share capital, reserves and other equity interest [text block]
 
(€ million)
  
December 31, 2018
  
December 31, 2017
 
Share capital
    
4,005
     
4,005
  
Retained earnings
    
36,702
     
35,966
  
Cumulative currency translation differences
    
6,605
     
4,818
  
Legal reserve
    
959
     
959
  
Reserve for treasury shares
    
581
     
581
  
Reserve related to the fair value of cash flow hedging derivatives net 
of the tax effect
    
(9)
     
183
  
Reserve related to the defined benefit plans net of tax effect
    
(130)
     
(114)
  
Other comprehensive income on equity-accounted investments
    
66
     
90
  
Other comprehensive income on other investments
    
15
        
Other reserves
    
190
     
190
  
Treasury shares
    
(581)
     
(581)
  
Interim dividend
    
(1,513)
     
(1,441)
  
Net profit (loss) for the year
    
4,126
     
3,374
  
     
51,016
     
48,030
  
Reserve of cash flow hedges [member] | Reserve of remeasurements of defined benefit plans [member] | Reserve of gains and losses on remeasuring available-for-sale financial assets [member]  
Disclosure of reserves within equity [text block]
Other Comprehensive Income reserves
 
 
Cash flow hedge derivatives
 
Defined benefit plans
 
 
 
 
(€ million)
 
Gross
reserve
 
Deferred
tax
liabilities
 
Net
reserve
 
Gross
reserve
 
Deferred
tax
liabilities
 
Net
reserve
 
Other
comprehensive

income on
equity-
accounted

investments
 
Investments
valued at
fair value
Reserve as of December 31, 2017
 
 
240
 
 
 
(57
)
 
 
183
 
 
 
(133
)
 
 
19
 
 
 
(114
)
 
 
90
 
 
 
  
Changes of the year
 
 
399
 
 
 
(116
)
 
 
283
 
 
 
(15
)
 
 
(2
)
 
 
(17
)
 
 
(24
)
 
 
15
 
Foreign currency translation differences
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1
 
 
 
(1
)
 
 
 
 
 
 
 
 
 
 
 
 
Change in scope of consolidation
 
 
 
 
 
 
 
 
 
 
 
 
 
 
4
 
 
 
(3
)
 
 
 
1
 
 
 
 
 
 
 
 
 
Reversal to inventories adjustments
 
 
(10
)
 
 
3
 
 
 
(7
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Reclassification adjustments
 
 
(642
)
 
 
174
 
 
 
(468
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Reserve as of December 31, 2018
 
 
(13
)
 
 
4
 
 
 
(9
)
 
 
(143
)
 
 
 
13
 
 
 
(
130
)
 
 
66
 
 
 
15
 
Reserve as of December 31, 2016
 
 
246
 
 
 
(57
)
 
 
189
 
 
 
(99
)
 
 
(13
)
 
 
(112
)
 
 
21
 
 
 
 
 
Changes of the year
 
 
(59
)
 
 
14
 
 
 
(45
)
 
 
(33
)
 
 
29
 
 
 
(4
)
 
 
69
 
 
 
 
 
Foreign currency translation differences
 
 
 
 
 
 
 
 
 
 
 
 
 
 
(1
) 
 
 
3
 
 
 
2
 
 
 
 
 
 
 
 
 
Reclassification adjustments
 
 
53
 
 
 
(14
)
 
 
39
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Reserve as of December 31, 2017
 
 
240
 
 
 
(57
)
 
 
183
 
 
 
(133
)
 
 
 
19
 
 
 
 (
114
)
 
 
90