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14. FINANCIAL INSTRUMENTS (Details 12) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of detailed information about financial instruments [line items]
Movement	R$ 5,537,174	R$ 604,828	R$ 1,415,962
Realization	(1,667,886)	(790,353)	R$ (370,191)
Foreign exchange risk [member] | Cash flow hedges [member]
Disclosure of detailed information about financial instruments [line items]
Fair value, net of taxes, beginning	1,255,770
Movement	(5,537,174)
Realization	(1,667,886)
Fair value, net of taxes, ending	R$ 5,125,058	R$ 1,255,770

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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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