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24. FINANCIAL INCOME (EXPENSES) (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Financial income R$ 295,074 R$ 643,590 R$ 487,720
Financial expenses (2,758,701) (3,166,017) (3,852,882)
Financial income (expense), net (2,463,627) (2,522,427) (3,365,162)
Statement of gains and (losses) on derivative transactions 28,274 (806,760) 842,242
Dollar-to-CDI swap      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Statement of gains and (losses) on derivative transactions   (18)
Dollar-to-real swap (NDF)      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Statement of gains and (losses) on derivative transactions   785,702
Future Dollar      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Statement of gains and (losses) on derivative transactions (805,760) 25,381
Dollar-to-euro swap (NDF)      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Statement of gains and (losses) on derivative transactions   39,668
Dollar-to-euro swap      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Statement of gains and (losses) on derivative transactions (229) (6,467) (4,405)
Swap Pre x CDI      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Statement of gains and (losses) on derivative transactions (299) (4,956)
Swap CDI x Pre      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Statement of gains and (losses) on derivative transactions (63) 870
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  
Borrowings and financing - foreign currency      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Financial expenses (827,841) (930,508) (938,047)
Borrowings and financing - local currency      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Financial expenses (1,610,714) (2,229,849) (2,116,149)
Related parties      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Financial expenses (3,185) (1,333)
Capitalized interest      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Financial expenses 91,957 215,794 166,366
Losses on derivatives      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Financial expenses (362) (4,956)
Interest, fines and late payment charges      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Financial expenses (72,343) (38,002) (20,511)
Commission and bank fees      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Financial expenses (159,088) (155,249) (81,594)
PIS/COFINS over financial income      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Financial expenses (21,926) (39,154) (23,699)
Other financial expenses      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Financial expenses [1] (142,296) (102,450) (105,050)
Inflation adjustment and exchange differences, net      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Financial expenses (16,450) (116,948) (727,909)
Inflation adjustments, net      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Financial expenses (10,556) 7,865 44,422
Exchange differences, net      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Financial expenses (5,665) 921,310 (1,618,659)
Exchange gain (losses) on derivatives      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Financial expenses (229) (812,227) 846,328
Related parties      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Financial income 61,549 60,964 65,084
Income from short-term investments      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Financial income 162,292 301,401 212,826
Gain from derivative      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Financial income 28,503 5,829 870
Gain on repurchase of debt securities      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Financial income 146,214 166,642
Other income      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Financial income [2] R$ 42,730 R$ 129,182 R$ 42,298
[1] Refers substantially IOF (tax on financial transactions) and provision for IRRF (Corporate Income Tax) / CSLL (Social Contribution on Profit).
[2] Refers substantially an updating of tax credits.