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MARKETABLE SECURITIES (Details) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
MARKETABLE SECURITIES
Marketable securities	R$ 2,396,857	R$ 6,330,334
Current	2,212,079	6,150,631
Non Current	184,778	179,703
Investment funds
MARKETABLE SECURITIES
Marketable securities	R$ 6,445	6,683
Investment funds | CDI
MARKETABLE SECURITIES
Percentage of basis used to calculate interest rate	133.36%
Private Funds
MARKETABLE SECURITIES
Marketable securities	R$ 175,317	1,431,303
Private Funds | CDI
MARKETABLE SECURITIES
Percentage of basis used to calculate interest rate	157.67%
Public titles measured at fair value through profit or loss
MARKETABLE SECURITIES
Marketable securities	R$ 444,712	1,631,319
Public titles measured at fair value through profit or loss | CDI
MARKETABLE SECURITIES
Percentage of basis used to calculate interest rate	157.67%
Private Securities (Compromised)
MARKETABLE SECURITIES
Marketable securities	R$ 1,585,605	3,081,326
Private Securities (Compromised) | CDI
MARKETABLE SECURITIES
Percentage of basis used to calculate interest rate	102.42%
Private Securities (Compromised) - Escrow Account
MARKETABLE SECURITIES
Marketable securities	R$ 184,778	R$ 179,703
Private Securities (Compromised) - Escrow Account | CDI
MARKETABLE SECURITIES
Percentage of basis used to calculate interest rate	102.00%

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The percentage of the basis (reference rate) used for calculation of the interest rate.

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- Definition

Total current and non-current debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale.

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Amount of investments in debt and equity securities which have original maturities over to 90 days, including, but not limited to, held-to-maturity, trading and available-for-sale expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer.

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Debt and equity financial instruments including securities held-to-maturity.

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