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3. CASH AND CASH EQUIVALENTS (Tables)
 12 Months Ended
Dec. 31, 2017
Cash And Cash Equivalents Tables  
Cash and cash equivalents
      Consolidated
  12/31/2017   12/31/2016
Current      
Cash and cash equivalents      
    Cash and banks           193,702   502,480
       
Short-term investments      
In Brazil:      
Government securities             12,100   17,929
Private securities           644,525   1,390,707
            656,625   1,408,636
Abroad:      
Time deposits 2,561,245   2,960,046
Total short-term investments 3,217,870   4,368,682
Cash and cash equivalents 3,411,572   4,871,162