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12. BORROWINGS, FINANCING AND DEBENTURES (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about borrowings [line items]    
Borrowings and financing, current R$ 5,681,797 R$ 6,551,764
Borrowings and financing, noncurrent 23,260,944 23,017,953
Transaction costs and issue premiums, current (28,358) (24,862)
Transaction costs and issue premiums, noncurrent (87,309) (34,011)
Borrowings and financing and transaction costs, current 5,653,439 6,526,902
Borrowings and financing and transaction costs, noncurrent 23,173,635 22,983,942
Foreign Currency    
Disclosure of detailed information about borrowings [line items]    
Borrowings and financing, current 3,687,971 1,566,302
Borrowings and financing, noncurrent 12,550,266 13,214,982
Foreign Currency | Prepayment    
Disclosure of detailed information about borrowings [line items]    
Borrowings and financing, current 1,016,737 791,163
Borrowings and financing, noncurrent 3,830,240 4,097,509
Foreign Currency | Perpetual bonds    
Disclosure of detailed information about borrowings [line items]    
Borrowings and financing, current 2,490,178  
Borrowings and financing, noncurrent 8,613,491  
Foreign Currency | Others    
Disclosure of detailed information about borrowings [line items]    
Borrowings and financing, current 181,056 251,630
Borrowings and financing, noncurrent 106,535 197,131
Foreign Currency | Advance contract exchange (ACC)    
Disclosure of detailed information about borrowings [line items]    
Borrowings and financing, current   523,509
Borrowings and financing, noncurrent   8,920,342
Local Currency    
Disclosure of detailed information about borrowings [line items]    
Borrowings and financing, current 1,993,826 4,985,462
Borrowings and financing, noncurrent 10,710,678 9,802,972
Local Currency | Prepayment    
Disclosure of detailed information about borrowings [line items]    
Borrowings and financing, current 103,376 3,303
Borrowings and financing, noncurrent 100,000
Local Currency | BNDES/FINAME    
Disclosure of detailed information about borrowings [line items]    
Borrowings and financing, current 1,890,450 4,982,159
Borrowings and financing, noncurrent R$ 10,710,678 R$ 9,702,972