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FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT - Rating (Details) - Financial risks management - BRL (R$) R$ in Thousands	Dec. 31, 2020	Dec. 31, 2019
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT
Financial Assets	R$ 14,489,143	R$ 14,298,291
Financial Liabilities	89,532,052	74,082,444
Financial liabilities, net of financial assets	75,042,909	59,784,153
Amortized cost
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT
Financial Liabilities	81,414,652	71,164,531
Amortized cost | Loans, financing and debentures
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT
Financial Liabilities	72,899,882	63,684,326
Amortized cost | Lease liabilities
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT
Financial Liabilities	5,191,760	3,984,070
Amortized cost | Liabilities for asset acquisition and subsidiaries
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT
Financial Liabilities	502,228	541,615
Amortized cost | Trade accounts payable
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT
Financial Liabilities	2,361,098	2,376,459
Amortized cost | Other liabilities
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT
Financial Liabilities	459,684	578,061
Fair value through profit or loss
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT
Financial Liabilities	8,117,400	2,917,913
Fair value through profit or loss | Derivative financial instruments
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT
Financial Liabilities	8,117,400	2,917,913
Amortized cost
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT
Financial Assets	10,724,528	6,848,937
Amortized cost | Cash and cash equivalents
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT
Financial Assets	6,835,057	3,249,127
Amortized cost | Trade accounts receivable
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT
Financial Assets	2,915,206	3,035,817
Amortized cost | Other assets
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT
Financial Assets	974,265	563,993
Fair value through other comprehensive income
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT
Financial Assets	26,338	20,048
Fair value through other comprehensive income | Other investments
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT
Financial Assets	26,338	20,048
Fair value through profit or loss
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT
Financial Assets	3,738,277	7,429,306
Fair value through profit or loss | Derivative financial instruments
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT
Financial Assets	1,341,420	1,098,972
Fair value through profit or loss | Marketable securities
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT
Financial Assets	R$ 2,396,857	R$ 6,330,334

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The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities]

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