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13. FINANCIAL INSTRUMENTS (Details 7) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about hedged items [line items]
Fair value of cash flow hedge, net of taxes, beginning	R$ 395,524
Movement	1,415,962	R$ 50,987	R$ (1,005,968)
Realization	(370,191)	(92,140)	R$ (77,444)
Fair value of cash flow hedge, net of taxes, ending	1,441,295	395,524
Cash flow hedge accounting
Disclosure of detailed information about hedged items [line items]
Fair value of cash flow hedge, net of taxes, beginning	395,524
Movement	1,415,962
Realization	(370,191)
Fair value of cash flow hedge, net of taxes, ending	R$ 1,441,295	R$ 395,524

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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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The amount of reclassification adjustments related to cash flow hedges, net of tax. Reclassification adjustments are amounts reclassified to profit (loss) in the current period that were recognised in other comprehensive income in the current or previous periods. [Refer: Cash flow hedges [member]; Other comprehensive income]

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