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21. LEASING TRANSACTIONS (Details 4) - BRL (R$)
R$ in Millions
Dec. 31, 2019
Dec. 31, 2018
 [1]
Disclosure of fair value measurement of assets [line items]    
Undiscounted values R$ 704  
Embedded interest (416)  
Lease liabilities 288 R$ 342
2020 [Member]    
Disclosure of fair value measurement of assets [line items]    
Undiscounted values 86  
2021 [Member]    
Disclosure of fair value measurement of assets [line items]    
Undiscounted values 58  
2022 [Member]    
Disclosure of fair value measurement of assets [line items]    
Undiscounted values 26  
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 To 2045 [Member]    
Disclosure of fair value measurement of assets [line items]    
Undiscounted values R$ 482  
[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.