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12. FINANCIAL INSTRUMENTS (Details 7) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of detailed information about financial instruments [line items]
Movement	R$ 604,828	R$ 1,415,962	R$ 50,987
Realization	(790,353)	(370,191)	R$ (92,140)
Foreign Exchange Risk [Member]
Disclosure of detailed information about financial instruments [line items]
Fair value, net of taxes, ending	5,567
Cash flow hedges [member] | Foreign Exchange Risk [Member]
Disclosure of detailed information about financial instruments [line items]
Fair value, net of taxes, beginning	1,441,295
Movement	(604,828)
Realization	(790,353)
Fair value, net of taxes, ending	1,255,770	1,441,295
Fair Value Of Cash Flow Hedge, Net Of Taxes [member] | Foreign Exchange Risk [Member]
Disclosure of detailed information about financial instruments [line items]
Fair value, net of taxes, beginning	1,441,295
Movement	604,828
Realization	(790,353)
Fair value, net of taxes, ending	R$ 1,255,770	R$ 1,441,295

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The fair value of financial instruments designated as hedging instruments. Hedging instruments are designated derivatives or (for a hedge of the risk of changes in foreign currency exchange rates only) designated non-derivative financial assets or non-derivative financial liabilities whose fair value or cash flows are expected to offset changes in the fair value or cash flows of a designated hedged item. [Refer: At fair value [member]; Derivatives [member]; Derivative financial assets; Derivative financial liabilities; Financial instruments, class [member]; Financial assets; Financial liabilities]

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The gains (losses) recognised in other comprehensive income on cash flow hedges, net of tax. [Refer: Cash flow hedges [member]]

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