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Costs (Tables)
 12 Months Ended
Dec. 31, 2017
Costs  
Disclosure of detailed information about Purchase, services and other [text block]

Purchase, services and other

(€ million)   2017   2016   2015
Production costs - raw, ancillary and consumable materials and goods     35,907       27,783       39,812  
Production costs - services     12,228       12,727       13,197  
Operating leases and other     1,684       1,672       2,205  
Net provisions for contingencies     886       505       644  
Expenses for price variation on overliftling and underlifting operations     145       240       278  
Other expenses     1,844       1,512       1,135  
      52,694       44,439       57,271  
less:                        
- capitalized direct costs associated with self-constructed assets - tangible assets     (224 )     (297 )     (323 )
- capitalized direct costs associated with self-constructed assets - intangible assets     (9 )     (18 )     (100 )
      52,461       44,124       56,848  
Disclosure of detailed information about arrangements involving legal form of lease [text block]

Future minimum lease payments expected to be paid under non-cancelable operating leases are provided below:

(€ million)   2017   2016   2015
To be paid:                        
- within 1 year     883       593       495  
- between 2 and 5 years     1,710       1,040       1,061  
- beyond 5 years     1,939       785       809  
      4,532       2,418       2,365  
Payroll and related costs [text block]

Payroll and related costs

(€ million)   2017   2016   2015
Wages and salaries     2,447       2,491       2,648  
Social security contributions     441       445       453  
Cost related to employee benefit plans     113       81       85  
Other costs     162       202       182  
      3,163       3,219       3,368  
less:                        
- capitalized direct costs associated with self-constructed assets - tangible assets     (202 )     (215 )     (203 )
- capitalized direct costs associated with self-constructed assets - intangible assets     (10 )     (10 )     (46 )
      2,951       2,994       3,119  
Disclosure of detailed information about average number of employees [text block]

The Group average number and breakdown of employees by category is reported below:

    2017   2016   2015
(number)   Subsidiaries   Joint operations   Subsidiaries   Joint operations   Subsidiaries   Joint operations
Senior managers     995       17       1,018       18       1,044       17  
Junior managers     9,089       98       9,160       109       9,091       108  
Employees     16,721       371       17,180       384       17,685       379  
Workers     5,659       285       5,703       294       5,895       303  
      32,464       771       33,061       805       33,715       807  
Disclosure of information about key management personnel [text block]

Compensation of personnel holding key positions in planning, directing and controlling the Eni Group subsidiaries, including executive and non-executive officers, general managers and managers with strategic responsibilities in office during the year (including contributions and ancillary costs) amounted to €43 million, €44 million and €42 million for 2017, 2016 and 2015, respectively, and consisted of the following:

(€ million)   2017   2016   2015
Wages and salaries     25       26       26  
Post-employment benefits     2       2       2  
Other long-term benefits     9       12       12  
Indemnities upon termination of employment     7       4       2  
      43       44       42  
Disclosure of detailed information about other operating income loss [text block]

The analysis of net income (loss) on commodity derivatives was as follows:

(€ million)   2017   2016   2015
Net income (loss) on cash flow hedging derivatives     12       (1 )     2  
Net income (loss) on other derivatives     (44 )     17       (487 )
      (32 )     16       (485 )
Disclosure of detailed information about depreciation and amortization [text block]

Depreciation and amortization

(€ million)   2017   2016   2015
Depreciation, depletion and amortization:                        
- tangible assets     7,199       7,308       8,646  
- intangible assets     286       253       303  
      7,485       7,561       8,949  
less:                        
- capitalized direct costs associated with self-constructed assets - tangible assets     (2 )     (2 )     (9 )
      7,483       7,559       8,940  
Disclosure of detailed information about net impairment reversal [text block]

Net impairment (reversal)

(€ million)   2017   2016   2015
Impairments:                        
- tangible assets     848       1,067       5,993  
- intangible assets     14               544  
      862       1,067       6,537  
less:                        
- reversal of impairments - tangible assets     (1,055 )     (1,153 )     (3 )
- reversal of impairments - intangible assets     (32 )     (389 )        
      (225 )     (475 )     6,534  
Disclosure of detailed information about write-off [text block]

Write-off

(€ million)   2017   2016   2015
Write-off                        
- tangible assets     239       289       678  
- intangible assets     24       61       10  
      263       350       688