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12. FINANCIAL INSTRUMENTS (Details 7) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of detailed information about hedged items [line items]      
Fair value of cash flow hedge, net of taxes, beginning R$ 436,677 R$ 1,520,089  
Movement 50,987 (1,005,968) R$ 1,410,896
Realization (92,140) (77,444) (11,439)
Fair value of cash flow hedge, net of taxes, ending 395,524 436,677 1,520,089
Cash flow hedge accounting      
Disclosure of detailed information about hedged items [line items]      
Fair value of cash flow hedge, net of taxes, beginning 436,677 1,520,089  
Movement 50,987 (1,005,968)  
Realization (92,140) (77,444)  
Fair value of cash flow hedge, net of taxes, ending R$ 395,524 R$ 436,677 R$ 1,520,089