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23. Salaries and social security taxes payable (Tables)
 12 Months Ended
Dec. 31, 2018
Salaries And Social Security Taxes Payable Tables Abstract  
Salaries and social security taxes payable
     12.31.18     12.31.17 
Non-current        
Early retirements payable                       14,884                         4,960
Seniority-based bonus                     147,853                     171,719
Total non-current                     162,737                     176,679
         
Current        
Salaries payable and provisions                  1,581,241                  1,571,228
Social security payable                     151,137                     223,165
Early retirements payable                       10,248                         7,099
Total current                  1,742,626                  1,801,492
Salaries and social security taxes charged to profit or loss
     12.31.18     12.31.17     12.31.16 
Salaries                  4,336,533                  4,897,440                   5,006,596
Social security taxes                  1,686,430                  1,904,559                   1,947,009
Total salaries and social security taxes                  6,022,963                  6,801,999                   6,953,605