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Inventories (Tables)
 12 Months Ended
Dec. 31, 2018
Text block [abstract]  
Summary of Inventories
     2018     2017     2016  

Refined products

      33,583       16,260       13,390  

Crude oil and natural gas

      14,571       8,474       6,551  

Products in process

      1,177       640       411  

Raw materials, packaging materials and others

      3,993       1,775       1,456  
  

 

 

    

 

 

    

 

 

  
     53,324 (1)       27,149 (1)       21,808 (1)  
  

 

 

    

 

 

    

 

 

  

 

(1)

As of December 31, 2018, 2017 and 2016, the cost of inventories does not exceed their net realizable value.