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22 Debentures (Details 2) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Debentures Abstract    
Debentures, beginning balance R$ 8,429,710 R$ 7,518,131
Funding 453,951 2,965,028
Charges and monetary variations (1,046,295) 623,795
Amortization - principal (422,295) (1,977,125)
Payment - charges (657,590) (700,119)
Debentures, ending balance R$ 6,757,481 R$ 8,429,710