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Non-current and current inventories | 12 Months Ended
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Dec. 31, 2018
Disclosure Of Inventories [Abstract] |
Disclosure of inventories [text block] | 8 Non-current and current inventories
(€ million) |  | December 31, 2018 |  | December 31, 2017
Raw and auxiliary materials and consumables |  |  | 889 |  |  |  | 999 |
Materials and supplies |  |  | 1,451 |  |  |  | 1,566 |
Finished products and goods |  |  | 2,274 |  |  |  | 2,000 |
Certificates and emission rights |  |  | 37 |  |  |  | 56 |
|  |  | 4,651 |  |  |  | 4,621 |
Raw and auxiliary materials and consumables include oil-based feedstock, catalysts and other consumables pertaining to refining and chemical activities. Materials and supplies include materials to be consumed in drilling activities and spare parts related to the Exploration & Production segment for € 1,334 million (€ 1,441 million at December 31, 2017 ). Finished products and goods included gas and petroleum products for € 1,543 million (€ 1,287 million at December 31, 2017 ) and chemical products for € 547 million (€ 489 million at December 31, 2017 ). Certificates and emission rights are measured at the fair value. The fair value hierarchy is level 1 . Inventories of  € 95 million (€ 86 million at December 31, 2017 ) were pledged to guarantee the estimated imbalance in volumes input to/off-taken from the national gas network operated by Snam Rete Gas SpA. Inventories are stated net of a write down provision of  € 578 million (€ 245 million at December 31, 2017 ). Net additions to write down provision for 2018 amounted to € 337 million and primarily related to the alignment of the carrying amount of crude oil and oil products inventories to their net realizable values at the period end, as a consequence of the rapid decline in hydrocarbons prices recorded in the final months of 2018 . Inventories held for compliance purposes of  € 1,217 million (€ 1,283 million at December 31, 2017 ) primarily related to Italian subsidiaries for € 1,200 million (€ 1,267 million at December 31, 2017 ) in accordance with minimum stock requirements for oil and petroleum products set forth by applicable laws.

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