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3 CASH AND CASH EQUIVALENTS (Tables)
 12 Months Ended
Dec. 31, 2019
Cash and cash equivalents [abstract]  
Schedule of cash and cash equivalents
    Consolidated
  12/31/2019   12/31/2018
Current      
Cash and cash equivalents      
Cash and banks 496,769   1,124,714
       
Short-term investments      
In Brazil:      
Government securities 69,093   10,247
Private securities 462,831   609,480
  531.924   619,727
Abroad:      
Private securities 60,262   503,563
Total short-term investments 592,186   1,123,290
Cash and cash equivalents 1,088,955   2,248,004