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25. FINANCIAL INCOME (EXPENSES) (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Financial income R$ 1,310,514 R$ 295,074 R$ 643,590
Financial expenses (2,806,157) (2,758,701) (3,166,017)
Inflation adjustment and exchange differences, net (533,919)   116,948
Financial income (expense), net (1,495,643) (2,463,627) (2,522,427)
Statement of gains and (losses) on derivative transactions (1) 28,274 (812,227)
Dollar-to-euro swap      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Statement of gains and (losses) on derivative transactions (1) (229) (6,467)
Future DI      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Statement of gains and (losses) on derivative transactions   28,503 5,829
Future Dollar      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Statement of gains and (losses) on derivative transactions     (805,760)
Swap Pre x CDI      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Statement of gains and (losses) on derivative transactions     (299)
Swap CDI x Pre      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Statement of gains and (losses) on derivative transactions     (63)
Borrowings and financing - foreign currency      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Financial expenses (988,821) (827,841) (930,508)
Borrowings and financing - local currency      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Financial expenses (1,020,867) (1,610,714) (2,229,849)
Related parties      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Financial expenses (16,092) (3,185)
Capitalized interest      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Financial expenses 71,611 91,957 215,794
Losses on derivatives      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Financial expenses   (362)
Interest, fines and late payment charges      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Financial expenses (71,100) (72,343) (38,002)
Commission and bank fees      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Financial expenses (182,179) (159,088) (155,249)
PIS/COFINS over financial income      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Financial expenses (84,404) (21,926) (39,154)
Other financial expenses      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Financial expenses 19,614 (142,296) (102,450)
Inflation adjustment and exchange differences, net      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Financial expenses   (16,450)  
Inflation adjustment and exchange differences, net (1,035)   7,865
Inflation adjustments, net      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Financial expenses   (10,556)  
Exchange differences, net      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Financial expenses   (5,665)  
Inflation adjustment and exchange differences, net (532,883)   921,310
Exchange gain (losses) on derivatives      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Financial expenses   (229)  
Inflation adjustment and exchange differences, net (1)   (812,227)
Related parties      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Financial income 64,888 61,549 60,964
Income from financial investments      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Financial income 111,235 162,292 301,401
Gain from derivative      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Financial income   28,503 5,829
Gain on repurchase of debt securities      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Financial income   146,214
Other income      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Financial income R$ 1,134,391 R$ 42,730 R$ 129,182