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Costs (Tables) | 12 Months Ended
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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 |

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