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19. LEASING TRANSACTIONS (Details 4) - BRL (R$) R$ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	[1]
Disclosure of fair value measurement of assets [line items]
Undiscounted values	R$ 644
Embedded interest	(417)
Lease liabilities	227	R$ 288	R$ 342
2021 [member]
Disclosure of fair value measurement of assets [line items]
Undiscounted values	56
2022 [member]
Disclosure of fair value measurement of assets [line items]
Undiscounted values	27
2023 [member]
Disclosure of fair value measurement of assets [line items]
Undiscounted values	26
2024 [member]
Disclosure of fair value measurement of assets [line items]
Undiscounted values	26
2025 [member]
Disclosure of fair value measurement of assets [line items]
Undiscounted values	26
2026 To 2045 [member]
Disclosure of fair value measurement of assets [line items]
Undiscounted values	R$ 483
[1] Financial expenses recognized in the income statement are net of PIS/Pasep and Cofins taxes credits on lease payments in the amounts of R$2 (R$2 on December 31, 2019).

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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.

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The amount of undiscounted finance lease payments to be received. Finance lease is a lease that transfers substantially all the risks and rewards incidental to ownership of an underlying asset.

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