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2. BASIS OF PREPARATION (Details) - BRL (R$) R$ in Millions | Jan. 02, 2020 | Dec. 31, 2019 | Jan. 02, 2019 | Dec. 31, 2018
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Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |  |  |
Right-of-use assets | R$ 342 | R$ 277 |  |  |
Lease liabilities - Obligations referring to operational leasing agreements |  | R$ (288) |  | R$ (342) | [1]
Adoption Of IFRS 16 [Member] |  |  |  |  |
Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |  |  |
Right-of-use assets |  |  | R$ 342 |  |
Lease liabilities - Obligations referring to operational leasing agreements |  |  | R$ (342) |  |
[1] | The Company's incremental borrowing rate applied to the lease liability recognized in the statement of financial position on the date of the initial application varied between 7.96% p.a. and 10.64% p.a., depending on the leasing contract period, and 13.17% p.a., respectively, for contracts with maturities of up to two years, two to five years and longer than five years. The rates applied to the contracts entered into during 2019 were 6.87% p.a., 7.33% p.a. and 8.08% p.a., for contracts with maturities, respectively, of up to three years, three to four years, and over four years. To determine the incremental borrowing rate, the Company used as a reference quotations obtained from financial institutions, these being a function of the Company's credit risk, and market conditions on the date of contracting.

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- Definition The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_47_b&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of assets that represent a lessee's right to use an underlying asset for the lease term. Underlying asset is an asset that is the subject of a lease, for which the right to use that asset has been provided by a lessor to a lessee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 53 -Subparagraph j -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_53_j&doctype=Standard -URIDate 2019-03-27 + Details
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