21. LEASING TRANSACTIONS (Details) - BRL (R$) R$ in Millions	Jan. 02, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of fair value measurement of assets [line items]
Right-of-use assets	R$ 342	R$ 277
Real Estate Property [Member]
Disclosure of fair value measurement of assets [line items]
Right-of-use assets	238	206	238
Vehicles [Member]
Disclosure of fair value measurement of assets [line items]
Right-of-use assets	R$ 104	R$ 71	R$ 104

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.

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

Name:	ifrs-full_RightofuseAssets
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant