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Trade Accounts Receivable, Net (Tables)
 12 Months Ended
Dec. 31, 2017
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Summary of Trade Accounts Receivable

As of December 31, 2017 and 2016, consolidated trade accounts receivable consisted of:

 

            2017     2016  

Trade accounts receivable

      Ps        32,623       32,356  

Allowances for doubtful accounts

         (2,145 )      (2,196 ) 
     

 

 

    

 

 

  
     Ps        30,478       30,160  
     

 

 

    

 

 

  
Summary of Changes in Valuation of Caption Allowance for Doubtful Accounts

Changes in the valuation of this caption allowance for doubtful accounts in 2017, 2016 and 2015, were as follows:

 

            2017     2016     2015  

Allowances for doubtful accounts at beginning of period

      Ps        2,196       2,152       1,856  

Charged to selling expenses

         252       556       434  

Additions through business combinations

         141       —         —    

Deductions

         (449 )      (867 )      (276 ) 

Foreign currency translation effects

         5       355       138  
     

 

 

    

 

 

    

 

 

  

Allowances for doubtful accounts at end of period

      Ps        2,145       2,196       2,152