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13. BORROWINGS AND FINANCING (Details 3) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Borrowings And Financing      
Opening balance R$ 27,967,036 R$ 28,827,074  
New debts 8,116,247 10,149,381  
Repayment (6,448,658) (11,775,093) R$ (5,019,978)
Payments of charges (1,922,130) (2,039,112)  
Accrued charges (Note 28) 2,002,052 1,996,305  
Consolidation of CBSI   19,722  
Others [1] 5,556,106 788,759  
Closing balance R$ 35,270,653 R$ 27,967,036 R$ 28,827,074
[1] Including unrealized exchange and monetary variations and funding cost.