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Inventories | 12 Months Ended
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Dec. 31, 2017
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Inventories | 10. INVENTORIES
|  | 2017 |  |  | 2016 |  |  | 2015 |
Refined products |  |  | 16,260 |  |  |  | 13,390 |  |  |  | 10,709 |
Crude oil and natural gas |  |  | 8,474 |  |  |  | 6,551 |  |  |  | 7,155 |
Products in process |  |  | 640 |  |  |  | 411 |  |  |  | 169 |
Construction works in progress for third parties |  |  | 142 |  |  |  | 12 |  |  |  | 85 |
Raw materials, packaging materials and others |  |  | 1,775 |  |  |  | 1,456 |  |  |  | 1,140 |
|  |  | 27,291 | (1) |  |  | 21,820 | (1) |  |  | 19,258 | (1)
(1) | As of December 31, 2017, 2016 and 2015, the cost of inventories does not exceed their net realizable value.

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- Definition The entire disclosure for inventories. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 2 -IssueDate 2017-01-01 -Section Disclosure -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=2&date=2017-03-01&anchor=sect_Disclosure&doctype=Standard -URIDate 2017-03-09 + Details
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