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3. SALE OF FOREIGN SUBSIDIARY (Details 3) - BRL (R$)
R$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
SaleOfForeignSubsidiaryLineItems [Line Items]          
Net cash provided by (used) by operating activities     R$ 2,208,105 R$ 571,851 R$ 275,918
Net cash provided by (used) by investing activities     (98,459) (1,049,224) (2,305,168)
Net cash provided by (used) by financing activities     (3,257,186) (993,755) (883,012)
Increase (decrease) in cash and cash equivalents for the period     (1,163,568) (1,459,590) (2,989,890)
Cash and cash equivalents at the beginning of the year R$ 3,411,572 R$ 4,871,162 3,411,572 4,871,162 7,861,052
Cash and cash equivalents at the end of the year     2,248,004 3,411,572 4,871,162
LLC          
SaleOfForeignSubsidiaryLineItems [Line Items]          
Net cash provided by (used) by operating activities 149,691 (69,216)      
Net cash provided by (used) by investing activities (6,269) (2,492)      
Net cash provided by (used) by financing activities (176,592) (1,860)      
Increase (decrease) in cash and cash equivalents for the period (33,170) (73,568)      
Cash and cash equivalents at the beginning of the year 33,930 112,428 R$ 33,930 112,428  
Cash and cash equivalents at the end of the year 760,000 R$ 38,860   R$ 33,930 R$ 112,428
Net cash received from the sale of the asset 1,525,590        
Cash and cash equivalents transferred on the sale of the assets (760)        
Working capital received 145,529        
Net cash provided by the sale of assets R$ 1,670,359