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Basis of Preparation of the Consolidated Financial Statements (Tables) | 12 Months Ended
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Dec. 31, 2017
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Detailed Information About Property, Plant and Equipment | Property, plant and equipment, other than those related to oil and gas exploration and production activities, are depreciated using the straight-line method, over the years of estimated useful life of the assets, as follows:
|  | Years of Estimated Useful Life |
Buildings and other constructions |  |  | 50 |
Refinery equipment and petrochemical plants |  |  | 20-25 |
Infrastructure of natural gas distribution |  |  | 20-50 |
Transportation equipment |  |  | 5-25 |
Furniture, fixtures and installations |  |  | 10 |
Selling equipment |  |  | 10 |
Electric power generation facilities |  |  | 15-20 |
Other property |  |  | 10 |
Summary of Information Related to Construction Contracts | The table below details information related to the construction contracts as of December 31, 2017, 2016 and 2015:
|  |  |  |  | Contracts in progress |
|  | Revenues for the year |  |  | Costs incurred plus accumulated recognized profits |  |  | Advances received |  |  | Retentions |
2017 |  |  | 710 |  |  |  | 1,398 |  |  |  | 61 |  |  |  | — |
2016 |  |  | 778 |  |  |  | 1,236 |  |  |  | — |  |  |  | — |
2015 |  |  | 455 |  |  |  | 577 |  |  |  | — |  |  |  | — |

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- Definition The entire disclosure for revenue recognised from construction contracts. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2018-01-01 -Name IAS -Number 11 -IssueDate 2017-01-01 -Section Disclosure -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=11&date=2017-03-02&anchor=sect_Disclosure&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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