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4. CASH AND CASH EQUIVALENTS
12 Months Ended
Dec. 31, 2020
Cash and cash equivalents [abstract]  
CASH AND CASH EQUIVALENTS
4. CASH AND CASH EQUIVALENTS
         
  Average rate (1)   12.31.20   12.31.19
Cash and bank accounts          
U.S. Dollar  -     1,185,208    1,356,128
Brazilian Reais  -    112,181   167,051
Euro  -     54,687    71,626
Other currencies  -     1,086,996   694,982
       2,439,072    2,289,787
Cash equivalents          
In Brazilian Reais          
Investment funds 0.05%    4,684    3,507
Bank deposit certificates 1.86%    3,662,448   879,758
       3,667,132   883,265
In U.S. Dollar          
Term deposit 0.71%   198,878   270,714
Overnight 0.07%    1,220,232   689,874
Other currencies          
Term deposit -    51,311   104,145
       1,470,421    1,064,733
       7,576,625    4,237,785
(1) Weighted average annual rate.