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29. Provisions
12 Months Ended
Dec. 31, 2018
Provisions [abstract]  
Provisions
     Non-current liabilities     Current liabilities 
     Contingencies 
 At 12.31.16                      504,038                     129,808
         
Increases                     411,975                     130,389
Decreases                             (4)                    (58,930)
Result from exposure to inflation for the year                    (32,890)                    (10,409)
 At 12.31.17                      883,119                     190,858
Increases                     472,067                     252,030
Decreases                    (85,662)                  (239,585)
Result from exposure to inflation for the year                  (199,374)                    (15,868)
 At 12.31.18                   1,070,150                     187,435