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Costs (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure Of Operating Expenses [Abstract] |
Disclosure of detailed information about Purchase, services and other [text block] |
(€ million) |  | 2018 |  | 2017 |  | 2016
Production costs - raw, ancillary and consumable materials and goods |  |  | 41,125 |  |  |  | 35,907 |  |  |  | 27,783 |
Production costs - services |  |  | 10,625 |  |  |  | 12,228 |  |  |  | 12,727 |
Operating leases and other |  |  | 1,820 |  |  |  | 1,684 |  |  |  | 1,672 |
Net provisions for contingencies |  |  | 1,120 |  |  |  | 886 |  |  |  | 505 |
Expenses for price variation on overliftling and underlifting operations |  |  |  |  |  |  | 145 |  |  |  | 240 |
Other expenses |  |  | 1,130 |  |  |  | 931 |  |  |  | 666 |
|  |  | 55,820 |  |  |  | 51,781 |  |  |  | 43,593 |
less: |  |  |  |  |  |  |  |  |  |  |  |
- capitalized direct costs associated with self-constructed assets - tangible assets |  |  | (192 | ) |  |  | (224 | ) |  |  | (297 | )
- capitalized direct costs associated with self-constructed assets - intangible assets |  |  | (6 | ) |  |  | (9 | ) |  |  | (18 | )
|  |  | 55,622 |  |  |  | 51,548 |  |  |  | 43,278 |
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) |  | 2018 |  | 2017 |  | 2016
To be paid: |  |  |  |  |  |  |  |  |  |  |  |
- within 1 year |  |  | 776 |  |  |  | 883 |  |  |  | 593 |
- between 2 and 5 years |  |  | 1,653 |  |  |  | 1,710 |  |  |  | 1,040 |
- beyond 5 years |  |  | 1,524 |  |  |  | 1,939 |  |  |  | 785 |
|  |  | 3,953 |  |  |  | 4,532 |  |  |  | 2,418 |
Payroll and related costs [text block] | Payroll and related costs
(€ million) |  | 2018 |  | 2017 |  | 2016
Wages and salaries |  |  | 2,409 |  |  |  | 2,447 |  |  |  | 2,491 |
Social security contributions |  |  | 448 |  |  |  | 441 |  |  |  | 445 |
Cost related to employee benefit plans |  |  | 220 |  |  |  | 113 |  |  |  | 81 |
Other costs |  |  | 170 |  |  |  | 162 |  |  |  | 202 |
|  |  | 3,247 |  |  |  | 3,163 |  |  |  | 3,219 |
less: |  |  |  |  |  |  |  |  |  |  |  |
- capitalized direct costs associated with self-constructed assets - tangible assets |  |  | (142 | ) |  |  | (202 | ) |  |  | (215 | )
- capitalized direct costs associated with self-constructed assets - intangible assets |  |  | (12 | ) |  |  | (10 | ) |  |  | (10 | )
|  |  | 3,093 |  |  |  | 2,951 |  |  |  | 2,994 |
Disclosure of detailed information about average number of employees [text block] | The Group average number and breakdown of employees by category is reported below:
(number) |  |  | 2018 |  |  | 2017 |  |  | 2016 |
| Subsidiaries |  |  | Joint operations |  |  | Subsidiaries |  |  | Joint operations |  |  | Subsidiaries |  |  | Joint operations |
Senior managers |  |  |  |  | 999 |  |  |  |  |  | 17 |  |  |  |  |  | 995 |  |  |  |  |  | 17 |  |  |  |  |  | 1,018 |  |  |  |  |  | 18 |  |
Junior managers |  |  |  |  | 9,095 |  |  |  |  |  | 84 |  |  |  |  |  | 9,089 |  |  |  |  |  | 98 |  |  |  |  |  | 9,160 |  |  |  |  |  | 109 |  |
Employees |  |  |  |  | 16,220 |  |  |  |  |  | 361 |  |  |  |  |  | 16,721 |  |  |  |  |  | 371 |  |  |  |  |  | 17,180 |  |  |  |  |  | 384 |  |
Workers |  |  |  |  | 5,259 |  |  |  |  |  | 283 |  |  |  |  |  | 5,659 |  |  |  |  |  | 285 |  |  |  |  |  | 5,703 |  |  |  |  |  | 294 |  |
|  |  |  |  | 31,573 |  |  |  |  |  | 745 |  |  |  |  |  | 32,464 |  |  |  |  |  | 771 |  |  |  |  |  | 33,061 |  |  |  |  |  | 805 |  |
Disclosure of information about key management personnel [text block] | Compensation (including contributions and ancillary costs) 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 service during the year consisted of the following:
(€ million) |  | 2018 |  | 2017 |  | 2016
Wages and salaries |  |  | 27 |  |  |  | 25 |  |  |  | 26 |
Post-employment benefits |  |  | 2 |  |  |  | 2 |  |  |  | 2 |
Other long-term benefits |  |  | 10 |  |  |  | 9 |  |  |  | 12 |
Indemnities upon termination of employment |  |  |  |  |  |  | 7 |  |  |  | 4 |
|  |  | 39 |  |  |  | 43 |  |  |  | 44 |

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