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11. BORROWINGS, FINANCING AND DEBENTURES (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about borrowings [line items]    
Borrowings and financing, current R$ 6,551,764 R$ 2,150,951
Borrowings and financing, noncurrent 23,017,953 28,382,802
Transaction costs and issue premiums, current (24,862) (33,503)
Transaction costs and issue premiums, noncurrent (34,011) (59,232)
Borrowings and financing and transaction costs, current 6,526,902 2,117,448
Borrowings and financing and transaction costs, noncurrent 22,983,942 28,323,570
Foreign Currency    
Disclosure of detailed information about borrowings [line items]    
Borrowings and financing, current 1,566,302 787,291
Borrowings and financing, noncurrent R$ 13,214,981 13,820,151
Foreign Currency | Prepayment    
Disclosure of detailed information about borrowings [line items]    
Rates 1% to 3.5%  
Borrowings and financing, current R$ 2,174 110,944
Borrowings and financing, noncurrent R$ 489,584 482,347
Foreign Currency | Prepayment    
Disclosure of detailed information about borrowings [line items]    
Rates 3.51% to 8%  
Borrowings and financing, current R$ 788,989 438,802
Borrowings and financing, noncurrent R$ 3,607,925 4,290,062
Foreign Currency | Perpetual bonds    
Disclosure of detailed information about borrowings [line items]    
Rates 7%  
Borrowings and financing, current R$ 4,503 4,436
Borrowings and financing, noncurrent R$ 3,308,000 3,259,100
Foreign Currency | Fixed rate notes    
Disclosure of detailed information about borrowings [line items]    
Rates 4.14% to 10%  
Borrowings and financing, current R$ 139,184 137,126
Borrowings and financing, noncurrent R$ 5,612,342 5,529,380
Foreign Currency | Advance contract exchange (ACC)    
Disclosure of detailed information about borrowings [line items]    
Rates 3.135%  
Borrowings and financing, current R$ 379,822  
Borrowings and financing, noncurrent  
Foreign Currency | Others    
Disclosure of detailed information about borrowings [line items]    
Rates 1.2% to 8%  
Borrowings and financing, current R$ 251,630 95,983
Borrowings and financing, noncurrent 197,130 259,262
Local Currency    
Disclosure of detailed information about borrowings [line items]    
Borrowings and financing, current 4,985,462 1,363,660
Borrowings and financing, noncurrent R$ 9,802,972 14,562,651
Local Currency | Prepayment    
Disclosure of detailed information about borrowings [line items]    
Rates 109.5% to 116.5% of CDI and fixed rate of 8%  
Borrowings and financing, current R$ 1,789,737 570,778
Borrowings and financing, noncurrent R$ 3,378,333 5,080,000
Local Currency | BNDES/FINAME    
Disclosure of detailed information about borrowings [line items]    
Rates 1,3% + TJLP and fixed rate 2.5% to 6% + 1,5%  
Borrowings and financing, current R$ 71,121 73,736
Borrowings and financing, noncurrent R$ 960,872 1,012,268
Local Currency | Debentures    
Disclosure of detailed information about borrowings [line items]    
Rates 110.8% to 113.7% of CDI  
Borrowings and financing, current R$ 523,252 538,003
Borrowings and financing, noncurrent R$ 770,767 1,270,383
Local Currency | CCB    
Disclosure of detailed information about borrowings [line items]    
Rates 112.5% and 113% of CDI  
Borrowings and financing, current R$ 2,601,352 181,143
Borrowings and financing, noncurrent R$ 4,693,000 R$ 7,200,000