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Basis of Preparation of the Consolidated Financial Statements (Tables)
 12 Months Ended
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        —          —