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Inventories | 12 Months Ended
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Dec. 31, 2017
Inventories |
Disclosure of inventories [text block] | 12 Inventories
|  | December 31, 2017 |  | December 31, 2016
(€ million) |  | Crude oil, gas and petroleum products |  | Chemical products |  | Other |  | Total |  | Crude oil, gas and petroleum products |  | Chemical products |  | Other |  | Total
Raw and auxiliary materials and consumables |  |  | 785 |  |  |  | 140 |  |  |  | 1,640 |  |  |  | 2,565 |  |  |  | 550 |  |  |  | 135 |  |  |  | 1,903 |  |  |  | 2,588 |
Products being processed and semi-finished products |  |  | 133 |  |  |  | 7 |  |  |  |  |  |  |  | 140 |  |  |  | 99 |  |  |  | 9 |  |  |  | 1 |  |  |  | 109 |
Work in progress |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  | 2 |
Finished products and goods |  |  | 1,287 |  |  |  | 489 |  |  |  | 83 |  |  |  | 1,859 |  |  |  | 1,394 |  |  |  | 389 |  |  |  | 86 |  |  |  | 1,869 |
Certificates and emission rights |  |  |  |  |  |  |  |  |  |  | 56 |  |  |  | 56 |  |  |  |  |  |  |  |  |  |  |  | 69 |  |  |  | 69 |
|  |  | 2,205 |  |  |  | 636 |  |  |  | 1,780 |  |  |  | 4,621 |  |  |  | 2,043 |  |  |  | 533 |  |  |  | 2,061 |  |  |  | 4,637 |
Other inventories of raw and auxiliary materials and consumables of  €1,640 million (€1,903 million at December 31, 2016) related to the Exploration & Production segment for €1,441 million (€1,699 million at December 31, 2016) and primarily comprised materials relating to perforation activities and the maintenance of infrastructures and facilities. Certificates and emission rights of  €56 million (€69 million at December 31, 2016) are measured at the fair value determined based on market quotations. The fair value hierarchy is level 1. Inventories of  €86 million (€82 million at December 31, 2016) were pledged to guarantee the estimated imbalance in volumes input to/off-taken from the national gas network operated by Snam Rete Gas SpA. Changes in inventories and in the loss provision were as follows:
|  | 2017 |  | 2016
(€ million) |  | Gross carrying amount |  | Loss provision |  | Net carrying amount |  | Gross carrying amount |  | Loss provision |  | Net carrying amount
Carrying amount at the beginning of the year |  |  | 4,892 |  |  |  | (255 | ) |  |  | 4,637 |  |  |  | 4,887 |  |  |  | (308 | ) |  |  | 4,579 |
Changes |  |  | 314 |  |  |  |  |  |  |  | 314 |  |  |  | (29 | ) |  |  |  |  |  |  | (29 | )
New or increased provisions |  |  |  |  |  |  | (81 | ) |  |  | (81 | ) |  |  |  |  |  |  | (125 | ) |  |  | (125 | )
Deductions |  |  |  |  |  |  | 18 |  |  |  | 18 |  |  |  |  |  |  |  | 163 |  |  |  | 163 |
Currency translation differences |  |  | (254 | ) |  |  | 22 |  |  |  | (232 | ) |  |  | 61 |  |  |  | (5 | ) |  |  | 56 |
Other changes |  |  | (86 | ) |  |  | 51 |  |  |  | (35 | ) |  |  | (27 | ) |  |  | 20 |  |  |  | (7 | )
Carrying amount at the end of the year |  |  | 4,866 |  |  |  | (245 | ) |  |  | 4,621 |  |  |  | 4,892 |  |  |  | (255 | ) |  |  | 4,637 |
Changes of the period amounting to €314 million related to the business lines Refining & Marketing for €192 million and Chemical for €129 million. Loss provision of €245 million related to the Exploration & Production segment for €191 million.

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