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30. Provisions (Tables)
 12 Months Ended
Dec. 31, 2019
Provisions [abstract]  
Provisions
     Non-current liabilities    Current liabilities
     Contingencies
At 12.31.18     1,645,569     288,218
         
Increases     1,239,577     127,655
Decreases     (20,596)     (77,473)
Result from exposure to inflation for the year      (801,947)      (124,564)
At 12.31.19     2,062,603     213,836
         
At 12.31.17     1,357,972     293,482
Increases     725,897     387,547
Decreases      (131,722)      (368,410)
Result from exposure to inflation for the year      (306,578)     (24,401)
At 12.31.18     1,645,569     288,218