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33. FINANCIAL INSTRUMENTS AND RISK MANAGEMENT (Details 5) - BRL (R$) R$ in Millions	Dec. 31, 2019	Dec. 31, 2018
Disclosure of risk management strategy related to hedge accounting [line items]
Derivative hedge instrument, liability	R$ (18,764)	R$ 18,120
Derivative hedge instrument	922	R$ 712
Probable Scenario [Member]
Disclosure of risk management strategy related to hedge accounting [line items]
Derivative hedge instrument, Assets	4,407
Derivative hedge instrument, liability	(5,922)
Derivative hedge instrument	(1,515)
Possible Scenario [Member]
Disclosure of risk management strategy related to hedge accounting [line items]
Derivative hedge instrument, Assets	4,422
Derivative hedge instrument, liability	(5,942)
Derivative hedge instrument	(1,520)
Remote Scenario [member]
Disclosure of risk management strategy related to hedge accounting [line items]
Derivative hedge instrument, Assets	4,438
Derivative hedge instrument, liability	(5,961)
Derivative hedge instrument	(1,523)
Ceming GT [Member] | Probable Scenario [Member]
Disclosure of risk management strategy related to hedge accounting [line items]
Derivative hedge instrument	3,216
Ceming GT [Member] | Possible Scenario [Member] | Depreciation of Twenty Five Percentage On Brazil Real [Member]
Disclosure of risk management strategy related to hedge accounting [line items]
Derivative hedge instrument	(245)
Ceming GT [Member] | Remote Scenario [member] | Depreciation of fifty percentage on brazil real [member]
Disclosure of risk management strategy related to hedge accounting [line items]
Derivative hedge instrument	(1,460)
At Cost [Member] | Ceming GT [Member]
Disclosure of risk management strategy related to hedge accounting [line items]
Derivative hedge instrument	1,691
Swaps [Member] | Ceming GT [Member] | Probable Scenario [Member]
Disclosure of risk management strategy related to hedge accounting [line items]
Derivative hedge instrument, Assets	7,193
Derivative hedge instrument, liability	(5,682)
Swaps [Member] | Ceming GT [Member] | Possible Scenario [Member] | Depreciation of Twenty Five Percentage On Brazil Real [Member]
Disclosure of risk management strategy related to hedge accounting [line items]
Derivative hedge instrument, Assets	6,087
Derivative hedge instrument, liability	(5,794)
Swaps [Member] | Ceming GT [Member] | Remote Scenario [member] | Depreciation of fifty percentage on brazil real [member]
Disclosure of risk management strategy related to hedge accounting [line items]
Derivative hedge instrument, Assets	5,052
Derivative hedge instrument, liability	(5,896)
Swaps [Member] | At Cost [Member] | Ceming GT [Member]
Disclosure of risk management strategy related to hedge accounting [line items]
Derivative hedge instrument, Assets	6,427
Derivative hedge instrument, liability	(5,774)
Option / Call Spread [Member] | Ceming GT [Member] | Probable Scenario [Member]
Disclosure of risk management strategy related to hedge accounting [line items]
Derivative hedge instrument, Assets	1,705
Option / Call Spread [Member] | Ceming GT [Member] | Possible Scenario [Member] | Depreciation of Twenty Five Percentage On Brazil Real [Member]
Disclosure of risk management strategy related to hedge accounting [line items]
Derivative hedge instrument, Assets	1,183
Option / Call Spread [Member] | Ceming GT [Member] | Remote Scenario [member] | Depreciation of fifty percentage on brazil real [member]
Disclosure of risk management strategy related to hedge accounting [line items]
Derivative hedge instrument, Assets	481
Option / Call Spread [Member] | At Cost [Member] | Ceming GT [Member]
Disclosure of risk management strategy related to hedge accounting [line items]
Derivative hedge instrument, Assets	R$ 1,038

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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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